Wall anchor for a screw, and assembly constituted by such a wall anchor and a screw

ES 2 274 337 T3

DESCRIPTION

Wall anchor for a screw and a set consisting of said wall anchor and a screw.

The present invention relates to a wall anchor for a screw, of the type having a longitudinal axis and which integrally comprises:

- two rods having a general tubular shape of revolution around an axis and longitudinally opposite each other in the form of:

- a shank of the head which internally limits a free coaxial passage for the shank of the screw and which carries an external flange transverse to the longitudinal end, and

- an element or stem of the screw nut that has inside a coaxial internal thread capable of cooperating with said stem of the screw and that supports on its outer periphery a series of approximately longitudinal teeth of the longitudinal end, preferably identical to each other, angularly distributed around the axis, preferably in a regular way, and constituting a longitudinal projection with respect to the nut element of the screw, in longitudinal opposition to the head shank with respect to the nut element of the screw, and

- a series of small approximately longitudinal rods, preferably identical to each other, distributed angularly around the axis, preferably regularly, arranged between the head stem and the nut element of the screw with which they connect, and plastically flexible in the direction away from the axis, in order to move from an initial configuration to an anchoring configuration of the wall anchor.

This type of wall anchor, advantageously and essentially constituted by cutting and bending a single strip of metal, is described in documents FR-B 2 640 704 and EP-B 0 378 907, in an embodiment in which It is intended to be used, as a tool insert for wood of the type known as a “center bit” to drill a partition to which it is to be anchored, being driven in rotation about itself about its axis with respect to the partition, for example, by means of a screwing action on a screw head, the stem of which is threaded into the nut element of the screw and whose head is arranged so that rests longitudinally on the flange of the axis of the head of the wall anchor.

For this purpose the teeth of the known type wall anchor are oriented parallel to their axis and have a corresponding cutting edge inclined with respect thereto and the screw shank or rod is elongated, in longitudinal opposition to the screw head, by an axial point that forms with respect to the nut element of the screw a projection greater than that of the teeth, in order to engage in the septum before the latter and thus ensure the fixation of the common axis of the wall anchor and the screw when the teeth make contact with the septum and progressively penetrate the latter under the action of the rotation imparted to the anchor wall around the axis.

This guidance, which ensures the fixing of the axis of the wall anchor and the screw with respect to the partition during the drilling of the latter by the teeth of the nut element of the screw, is essential but the presence, for these purposes, of the point that extends the rod of the screw constitutes a drawback since it is necessary, in order to adapt to this point, to have a much larger clearance inside or behind it in the direction of the common axis of the wall anchor and the screw, that the play necessary to receive the screw shank, lacking the mentioned point, of the normal screws used in association with the more conventional wall anchors, which lack teeth of drilling and that are anchored in a hole previously made in the partition by means of a conventional drilling tool, independent of the wall anchor.

Another drawback of the necessary presence of the guide tip in the extension of the screw rod resides in the impossibility of using a wall anchor made in accordance with documents FR-B 2 640 704 and EPB 0 378 907 in association with screws. Normal, whose rods do not have guide tips, if you want to take advantage of the possibility of drilling the partition by means of the wall anchor itself. The use of the known wall anchor effectively requires the manufacture and maintenance of a stock of specially adapted screws, provided with a guide tip, thus creating additional manufacturing and storage limitations and costs, all the more so as specifically adapted screws in this way They require more material and are bulkier than normal screws with identical dimensions of today's screw shanks.

The prior US 5,690,454 discloses a wall anchor according to the pre-characterizing part of claim 1.

The aim of the present invention is to solve these drawbacks and with this aim the present invention proposes a wall anchor for a screw of the type that has a longitudinal axis and integrally comprises:

ES 2 274 337 T3 two rods having a general tubular shape of revolution around the axis and opposite each other longitudinally in the form of:

a head shank that internally limits a free coaxial passage for the screw shank and carries an external flange transverse to the longitudinal end, and an element or nut shank of the screw having in its interior a coaxial internal thread capable of cooperating with said screw shank and bearing on its outer periphery a series of approximately longitudinal teeth of the longitudinal end, preferably identical to each other, distributed angularly around the axis, preferably in a regular way and constituting a longitudinal projection with respect to the nut element of the screw, in longitudinal opposition to the stem of the head with respect to the nut element of the screw, so that each of the teeth converge towards the axis in the longitudinal direction from the head shank towards the nut element of the screw, and has, in general, triangular shape defined on one side for connection of the screw nut element and on two free sides, so that the teeth together define a symmetrical tip with respect to the axis, protruding longitudinally on the screw nut element, in said direction longitudinal, and a series of small rods approximately longitudinally distributed angularly around the axis and arranged between the axis of the head and the nut element of the screw with which it connects, and plastically flexible in the direction away from the axis, for the purpose of move from the initial configuration to a wall anchor anchor configuration, characterized in that the wall anchor is made of a stamped metal strip and that each of said teeth is concave between said free sides, so that each of the teeth is curved towards the axis.

Those skilled in the art will easily understand that, in this type of wall anchor according to the invention, it is the teeth of the nut element of the screw themselves that constitute a central point capable of securing the axis of the wall anchor with respect to the partition in which they are to be placed, whether the wall anchor is associated with a screw or not.

Therefore, without significant additional manufacturing costs compared to a wall anchor of the type described in documents FR-B 2 640 704 and EP-B 0 378 907, a wall anchor according to the invention makes it possible to use screws normal, that is, they lack a guide tip in the extension of their rod or screw stem, that is to say, it is not necessary, on the one hand, to manufacture and keep in stock specifically adapted screws and, on the other hand, providing within the partition or at the rear of it as much space as is necessary to house the guide tip of the screw necessarily used in association with a wall anchor of the aforementioned previously known type.

Furthermore, due to the point defined by the teeth of the head stem, a wall anchor according to the invention, if the material from which it is made lends itself to it, can be used to pierce the septum even without relative rotation, that is, simply by applying a longitudinal thrust to the head stem after the tip of the screw nut element has been placed in contact with the septum, which can be done, for example, with a hammer. The wall anchor according to the invention behaves with respect to the partition like a simple nail when penetrating the partition.

However, with a view to placing a wall anchor according to the invention, in a partition in which the material from which it is made is not suitable for said drilling method or in order to make the geometry of the hole made more precise and reproducible Due to the wall anchoring itself in the partition, with a view to anchoring it therein, an embodiment of the wall anchor according to the invention is preferred that allows it to be used not only as a nail, but also as a drilling tool, that is, in such a way that it progressively drills the hole in which it is housed in the partition by rotation around its axis, after its tip has been placed against the partition.

To this end, according to a preferred embodiment of a wall anchor according to the invention, at least one of the free sides of each tooth, directed in a specific circumferential direction, identical from one tooth to another, takes the form of a cutting edge, making it possible to drill the receiving hole for the wall anchor by rotating the latter around its axis in said circumferential direction.

According to a more preferred embodiment, the two free sides of each tooth take the corresponding shape of a cutting edge, making it possible to carry out the drilling by rotation of the wall anchor in one direction or the other.

To allow the proper rotational movement to be imparted to the wall anchor, the head shank is preferably provided with an indentation to cooperate with a screwdriver around its free coaxial passage, making it possible to carry out drilling without having to engage a screw. on the wall anchor.

ES 2 274 337 T3

It is also possible, of course, to act on the wall anchor for this purpose by acting on the transverse head of a screw, the screw rod of which is engaged with the internal thread of the nut element of the screw and the head of which makes contact against the flange of the screw. head axis, in the longitudinal direction from the head shank towards the nut element of the screw. The screw is then selected in such a way that the screw rod has, between an end for connection to the screw head and a free end longitudinally opposite said head, a longitudinal dimension such that its free end is received between the teeth or displaced backwards longitudinally with respect to the latter, but in engagement with the internal thread of the screw nut element when the screw head makes contact against the flange and while the small rods of the wall anchor show their initial configuration, in order to avoid any risk of accidental extension of the screws. teeth through the free end of the screw. Subsequently, the rotation of the assembly constituted in this way by the wall anchor and the screw, about their common axis, with respect to the partition, should preferably take place in a circumferential direction corresponding to the direction of threading of the screw in the anchor of Wall. If only one of the free sides of each tooth takes the form of a cutting edge, it must in this case be one of the free sides that is forced to rotate in the same circumferential threading direction.

This embodiment of the wall anchor that allows drilling by rotation of the same around its axis with respect to the partition, remains, of course, compatible with placement in the partition like a nail if the material of which the partition is made is suitable for it.

In order to facilitate the engagement of the cutting edges of the teeth on the constituent material and in the case in which the receiving hole for the wall anchor in the partition is drilled by relative rotation, around the axis of the wall anchor, To facilitate the release of material removed from the septum, each of the teeth is concave between its free sides.

Once the wall anchor is fully engaged in the septum, that is, when the transverse flange of the head stem rests against the septum, the plastic flexing of the rods connecting the head stem and the nut element of the head screw, that is, the passage from the initial configuration to the anchor configuration of the wall anchor, can conventionally take place by rotating the screw in the screwing direction with respect to the wall anchor, around the axis of the wall anchor and the screw which is then common, thus progressively bringing the nut element of the screw closer longitudinally of the head stem.

It is, of course, necessary then that the point that has been formed by the teeth, and that initially covers the internal thread of the nut element in the screw at a certain longitudinal distance from it, does not form an obstacle, taking into account the fact that that the progressive longitudinal displacement of the nut element of the screw with respect to the head shank is manifested by a longitudinal protrusion, even higher, of the free end of the bolt rod relative to the bolt nut element.

To this end, a relatively large longitudinal dimensioning of the teeth can be provided, but this solution does not seem to be very satisfactory due to the fact that it is carried out or to the detriment of the possible longitudinal displacement of the nut element of the screw, with respect to to the stem of the head, that is, of the bending amplitude of the rods in the anchoring configuration, or of an excessive general longitudinal dimension of the teeth, requiring a large game inside the partition or on the back of it for reception.

An embodiment of the wall anchor according to the invention is therefore preferred so that the connection side of each tooth to the nut element of the screw constitutes a privileged zone of bending by plastic deformation such that each of the teeth is capable of pivoting around the respective connection side, with respect to the nut element of the screw, in a direction away from the axis, in particular under the thrust exerted by the screw rod, that is, more precisely the free end of the screw rod, in the longitudinal direction running from the head shank towards the nut element of the screw.

Therefore, although the longitudinal dimensions of the teeth are limited to what is strictly necessary to define a point sufficiently marked to ensure the centering of the wall anchor during its penetration into the septum, the teeth do not constitute any obstacle to the additional passage of the end. free of the screw rod, that is to say, for the longitudinal movement of approximation of the screw nut element with respect to the head shank and, consequently, to the transverse amplitude of the bending of the rods, adopting the anchoring configuration.

It will be noted that since a wall anchor according to the invention can be associated with a normal screw, that is, it lacks a centering point, on the one hand, and due to the fact that the presence of the screw during the placement of the wall anchor according to the invention is not essential, the placement is carried out as a screw or by relative rotation around the axis of the wall anchor, and provided that said indentation is arranged to cooperate with a screwdriver around the free axial passage of the nut shank, a wall anchor according to the invention can be marketed, not only in the form of a set with a dimensioned screw, preferably as indicated in the above, but also only, that is, without screw, being suitable for association with a screw of any desired length between the free end of its threaded rod and the end for the threaded rod, with respect to the head of the screw. This facilitates, possibly considerably, the maintenance of stocks and avoids that the public has to buy at the same time as the wall anchor, screws that will of course be appropriate for use with the latter, but not necessarily

ES 2 274 337 T3 fill any need and that in some cases must be replaced, by the user himself, by screws of different lengths purchased in an additional way.

As in the prior art, each of the teeth can advantageously be manufactured in one piece with the nut element of the screw and, in particular, the wall anchor can be constituted, at least basically, from a metal strap. stamped, according to a manufacturing process little different from that of the wall anchors described in documents FR-B 2 640 704 and EP-B 0 378 907, directly inspired by the method of document ER-B 2 546 989, in relation to wall anchors determined by teeth, except that it is necessary to give the teeth a triangular shape corresponding to one of the teeth of the wall anchor according to the invention and insert between the manufacturing steps of the known method, a step of manufacture of said teeth which does not present any difficulty for a person skilled in the art.

Similarly, the wall anchor according to the invention can additionally have any arrangement known per se, in particular with regard to the shape of the rods which, for example, can be adapted to what is indicated in the FR-B documents 2 640 704 and EP-B 0 378 907 or in document FR-B 2 546 989 or even in that of the French patent application No. 0202197, not yet published, of the current applicant himself, these examples being non-limiting in any way.

Other characteristics and advantages of a wall anchor according to the invention or of a set that combines said wall anchor and a screw will be apparent from the following description, which refers to a non-limiting example, and also from the attached drawings that accompany the description. .

Figure 1 shows a side elevation view of a wall anchor according to the invention.

Figures 2 and 3 show end views of the wall anchor in opposite directions, respectively marked II and III in Figure 1.

Figure 4 shows a side elevation view of the same wall anchor in the opposite direction from the viewing direction of Figure 1.

Figure 5 shows the main modifications applied to the method of manufacturing a wall anchor of the type referred to in the present invention, starting with a metal strap, which is described in document FR-B 2 546 989, to produce an anchor wall according to the invention, the strap being appreciated according to a plan view and three consecutive steps of the method illustrated on a corresponding blank of a wall anchor.

Figures 6 to 8 show three different methods of introducing a wall anchor according to the invention in a partition, with the formation of a receiving hole for the wall anchor in the partition by the wall anchor itself, the anchoring being appreciated wall in a side elevation view and the partition in section.

Figure 9 shows, in a similar way, the wall anchor at the end of its introduction into the partition by one or the other of the means shown respectively in Figures 6 to 8, the wall anchor being nevertheless in its initial setup.

Figure 10 shows, in a similar way, the beginning of the threading of a screw for fixing an object in the wall anchor still showing its initial configuration.

Figure 11 similarly shows a final stage of the threading operation, the wall anchor showing its configuration for anchoring in the partition.

Although, except for the presence and shape of the characteristic teeth of the present invention, the wall anchor shown in the figures has the characteristics of the wall anchor described in document FR-B 2 546 989, It will be readily understood that the characteristic arrangements of the present invention could be adopted in the case of different wall anchors and in particular in the case of a wall anchor of the type described in French Patent Application No. 02 02197 filed in February 21, 2002 by the Applicant and has not yet been published.

In the first place, reference will be made to Figures 1 to 4, in which a wall anchor (1) according to the invention has been shown, in which the different parts of the wall anchor will be observed in an identical or practically identical manner. described in document FR-B 2 546 989 and that, like the latter, it has been advantageously produced in a single piece by punching, winding and folding a metal strip (2), of which a section is shown in figure 5 with respect to the three consecutive situations, characteristics of the manufacture of a wall anchor according to the invention for said strap (2), of a blank (3) for an anchor wall (1). For the sake of simplicity, the same numerical references will be used to designate the different parts of the wall anchor (1) according to the invention and the corresponding parts of the blank (3).

Therefore the wall anchor (1) according to the invention, which has a longitudinal axis (4) of a generally symmetrical shape, comprises the same as the wall anchor described in Patent FR-B 2 546 989:

ES 2 274 337 T3

- a head stem (5) and a stem (6) of the screw nut, each in the form of a tubular sleeve of revolution around the axis (4) and longitudinally spaced to define two end zones longitudinally opposed to each other, the wall anchor (1), and

- A series of small approximately longitudinal rods (7), identical to each other and regularly distributed angularly around the axis (4) in this preferred example, whose rods (7) are arranged between the head stem (5) and the stem (6 ) of the screw nut and connect these elements to each other, forming a single piece, being plastically flexible in the direction away from the axis (4) in order to go from an initial configuration in which the rods are shown in Figures 1 to 4 and 6 to 10, to a configuration for anchoring the wall anchor (1 ) in a partition (8), the anchoring configuration of which is shown in figure 11.

To facilitate this step from the initial configuration to the anchoring configuration of the wall anchor (1), each of the rods (7) is slightly further away from the axis (4) in its longitudinal middle zone than in its connection respectively to the stem (5) of the head or stem (6) of the screw nut, in the initial configuration, as is also the case for the rods of the wall anchor described in document FR-B 2 546 989. The rods (7) are arranged in number four in the example shown in Figures 1 to 4, instead of being five in number as in the case of the wall anchor described and illustrated in document FR-B 2 546 989, but the The number of rods (7), as well as their shape, is independent as regards the present invention.

As in the case of the wall anchor described in document FR-B 2 546 989, the stem (5) of the head internally limits a free coaxial passage (9) for the threaded rod or threaded stem (10) of a screw. (11) that cooperates with the wall anchor (1), under conditions that will be described below and that integrally presents, due to its production in a single piece, a flat transverse crown (12), which defines one of the extreme longitudinal zones from the wall anchor (1). The flange (12), of general annular shape, surrounds the coaxial passage (9) and forms a projection around the axis (5) in the direction of housing with respect to the axis (4), that is, towards the outside of the stem (5 ), around which it has two longitudinal teeth (13), symmetrical with respect to the axis (4) and produced by stamping the flange (12), to allow the anchoring of the flange itself on the face (14) of the partition (8), whereby the introduction and blind anchoring inside the wall anchor (1) according to the invention is achieved. The flange (12) is formed for its part by a corresponding part of the blank (3) for the manufacture of the wall anchor (1), this part being initially cut from the rest of the flat laminar part (3), being subsequently folded back over a corresponding end of the stem (5) of the head, being turned longitudinally in opposition to the rods (7), after bending the parts of the blank (3) that correspond to the stem (5) of the head, to the stem (6) of the screw nut and to the rods (7) around an axis that becomes the longitudinal axis (4) of the wall anchor (1), under the conditions described in document FR- B 2 546 989.

The stem (6) of the screw nut itself has internally, in the same way as in the wall anchors described in document FR-B 2 546 989, a coaxial internal thread (15) capable of cooperating with the threaded rod (10 ) of the screw (11), whose internal coaxial thread (15) is arranged in a flat annular cap (16) perpendicular to the axis (4), produced in one piece with the stem (6) of the screw nut and which constitutes a part of the flat laminar element (3), the part of which is arranged flattened on one end of the stem (6) of the screw nut located longitudinally opposite the rods (7) after the aforementioned winding of the parts of the laminar element (3) corresponding to the stem ( 5) of the head and to the stem (6) of the screw nut and to the rods (7) around the axis (4) under the conditions described in document FR-B 2 546 989.

The flange (12) and the cap (16) remain firmly connected respectively to the stem (5) of the head and to the stem (6) for the screw nut, on one side of the shaft (4), by the respective tongue, not provided with a reference numeral, coming from the blank (3), and are firmly connected to the stem (5) of the head and to the stem (6) for the screw nut respectively on the other side of the shaft (4) , by the coupling of a corresponding dovetail or similar tongue, also produced in one piece with them, in a corresponding seat arranged respectively on the stem (5) of the head and on the stem (6) of the screw nut .

For a more complete description of the different parts of the wall anchor (1) according to the invention that have just been described, reference will be made to document FR-B 2 546 989, and also to the corresponding product marketed as the registered trademark "MOLLY" by the Applicant and its subsidiaries.

However, these characteristics common to the wall anchor, which have been described in document FR-B 2 546 989, are for their part not very significant with respect to the present invention and the general formula of the different parts of the wall anchor ( 1) that have been described could be different from that described in document FR-B 2 546 989, without thereby departing from the scope of the present invention, and this may be especially the case as regards the rods (7).

In a manner known per se as described in documents FR-B 2 640 704 and EP-B 0 378 907, the cap (16) makes contact at its outer periphery (17), which is located in the direct longitudinal extension of the outer periphery of the stem (6) of the screw nut at its end longitudinally opposite the rods (7) and which can therefore be considered as the longitudinally end zone of the outer periphery of the stem (6) of the screw nut , two teeth (18) symmetrical to each other with respect to the axis (4), which form a longitudinal projection with respect to the cap (16) and the stem (6) of the screw nut longitudinally opposite the rods (7),

ES 2 274 337 T3 the stem (5) of the head and the flange (12), to define the end of the wall anchor (1) longitudinally opposite its end defined by the flange (12). The two teeth (18), which could be replaced by a different number of teeth (18), preferably identical to each other and regularly distributed angularly around the axis (4), are integral elements with the cap (16) in correspondingly respective zones of the outer periphery (17) of the latter, being produced in a single piece, and coming from the same laminar blank (3) as the rest of the wall anchor (1) according to the invention, in its embodiment by way of example that has been shown, but they could also constitute pieces rigidly added to the stem (6) of the screw nut, likewise to the rest of the wall anchor (1) they could consist of a series of assembled components rigidly to each other.

Characteristically of the present invention, each of the teeth (18) converges towards the axis (4) in the longitudinal direction (19) from the stem (5) of the head towards the element (6) of the screw nut and corresponding to the direction of introduction of the wall anchor (1) according to the invention in the partition (8) through the face (14) of the former, and each of the teeth (18) has a general triangular shape defined by approximately rectilinear sides (20) for integral connection with the outer periphery (17) of the cap (16), that is, with the stem (6) of the nut of the screw by means of the cap (16), and by two free sides (21), substantially rectilinear, identical to each other and with opposite inclinations with respect to the connection sides (20). The two teeth (18) establish contact with each other, on the axis (4), by corners in connection with each other of the respective free sides (21), although the teeth (18) define together, for the wall anchor (1 ), an extreme longitudinal point (22) symmetrical with respect to the axis (4) and forming a longitudinal projection on the shank (6) of the screw nut in the direction (19).

More precisely, if we consider a median longitudinal plane (23) that passes through the axis (4) and that constitutes a median plane of symmetry with respect to the material tongue that makes the connection of the flange (12) in a single piece with the stem (5) of the head, for the dovetail tongue or similar that carries out its assembly diametrically in opposition with respect to the axis (4), for the tab that makes the connection of the cap (16) in one piece with the stem (6) of the screw nut and for the dovetail tab or similar that makes its assembly diametrically opposite with respect to the axis (4 ), the two teeth (18) are symmetrical with respect to the plane (23), while they are symmetrical respectively with respect to another longitudinal median plane (24) which intersects the longitudinal median plane (23) perpendicularly along the axis (4) and along which the two teeth (13) are arranged.

In this preferred embodiment, the two free sides (21) of each of the teeth (18) take the form of a cutting edge, capable of attacking the material that constitutes the partition (8) and, between these two free sides ( 21), each of the teeth (18) is concave, that is, curved towards the axis (4), thus increasing the attack capacity of the cutting edge defined by the free sides (21) and facilitating the evacuation of the material removed from the partition (8) when the wall anchor (1) according to the invention is used to drill a through hole by rotating it around its axis (4) with respect to the partition (8), under the conditions that will be described later.

The arrangement and shape of the teeth (18) constitute the only difference between the blank (3) of a wall anchor according to the invention (1) and the blank of a wall anchor according to document FR -B 2 546 989 to which reference will be made with respect to the blank (3), except with respect to the different number of rods (7) in the example shown.

As work progresses on the laminar blanks (3), this presence and conformation of the teeth (18) is manifested as follows:

- in the initial state in this respect, shown on the blank (3) located to the left of figure 5, and while this blank is flat except where the teeth (13) have already been produced therein of the flange (12), a smooth annular flange (44) of the flange (12) destined to be housed coaxially within the stem (5) of the head, a similar annular flange (25) of the cap (16) destined to be coaxially housed inside the shank (6) of the screw nut and having the internal coaxial thread (15) destined to cooperate with the threaded rod (10) of the screw (11), the two teeth (18) take the form of small triangular projections respectively arranged on each side of the cap (16), in extension with each other and drilled along their connection to the outer periphery (17) of the cap (16) by two corresponding circular holes (26) juxtaposed with each other along the periphery (17) and arranged symmetrically with each other with respect to the respective median plane of symmetry of the two teeth (18) and which also constitute the plane (24) of the wall anchor (1);

- In the following situation of the laminar piece (3), which has been shown in the central part of figure 5, a series of rectilinear folding lines are arranged in each of the teeth (18), constituting a corresponding one of said line (27) approximately a tangent to the outer periphery (17) of the cap (16) and being intended to form the side (20) for connection of the tooth (18) to the outer periphery (17), two corresponding lines (28) forming an isosceles triangle that has an angle at the base much smaller than the angle at the vertex and joining each other in the plane (24), the lines (27) and (28) being arranged with respect to to the holes (26) in such a way that the line (27) cuts each of the holes (26) corresponding to the same tooth (18), but remaining close to a position tangent to the hole (26) and cutting each of the lines (28) a corresponding one of the holes (26), maintaining, however, a position close to a position tangent to the hole and a line (29) that is arranged in

ES 2 274 337 T3 the plane (24) and which joins the corner of mutual connection of the two free sides (21) of the corresponding tooth (18), the connection of the two lines (28) corresponding to the latter;

- then, as shown in the right part of figure 5, folding the two teeth (18) along their respective line (27) in a little more than 90 ° with respect to the flange (12), accompanied of the formation along the respective lines (28) and (29) in order to impart to each of the teeth (18) the required concavity between their free sides (21), the mutual connection corners of the latter arrive to a position close to the axis (4), without, however, said axis (4) is reached.

It is only after winding the parts of the laminar piece (3) that corresponds to the head stem (5), connecting the stem (6) of the nut and the screw of the rods (7) the stems (5) and ( 6), and by folding on the flange (12) and the cap (16) respectively on the stem (5) of the head and on the stem (6) of the screw nut in a corresponding orientation perpendicular to the axis (4 ), that an operation that has not been shown, The clamping of the teeth (18) causes them to join each other at the mutual connection corners of the corresponding free sides (21) on the shaft (4) to form the tip (22).

It can also be seen in Figures 2 and 5 that the flange (12) has been arranged from the placement of the flange (44) destined to border the coaxial passage (9), around this coaxial passage (9), an indentation to receive a screwdriver, in this case, a transverse recess, in the form of four slots (30) diametrically opposed in pairs, with respect to axis (4) and arranged in respective median planes not shown that include axis (4) and which are arranged at 45 ° with respect to planes (23) and (24).

The wall anchor (1) according to the invention constituted in this way or constituted in an equivalent way, can be used in different ways which will be described below with reference to Figures 6 to 8 and then to Figures 9 to 11.

Figures 6 to 8 show different possibilities for the use of a wall anchor (1) according to the invention to arrange in the partition (8), starting from the face (14) of the former, a hole (45) that passes through the partition (8) from its face (14) to the opposite face (31) to receive the wall anchor (1) without play or practically without play, allowing it to pass through the partition (8) from one side to the other and allowing its clamping anchor of the partition (8) between the flange (12), that establishes flat contact on the face (14), anchoring itself in the latter by means of the teeth (13), around the hole (45) and, if necessary, embedding itself in the face (14) until it is flush with it and the rods (7) being plastically deformed in the direction away from the axis (4) in order to establish contact on the face (31) of the partition (8) by supporting them against the latter, under the same conditions as the wall anchors described in document FR-B 2 546 989.

Figure 6 shows the use of a wall anchor (1) according to the invention in a similar way to a nail, with respect to the partition (8).

With a view to said use, the axis (4) of the wall anchor (1) is oriented perpendicularly to the face (14) of the partition (8) and the tip (22) of the wall anchor (1) is placed against the face (14) at a point where the center of the mouth of the hole (45) to be made in the wall (14) is intended to coincide.

Retaining the wall anchor (1) with one hand, for example at the level of the rods (7), in this position with respect to the partition (8), the flange (12) is applied in the direction (19) substantially along the along the shaft (4) by means of a hammer (32) held with the other hand in order to cause progressive penetration of the wall anchor (1), firstly through the tip (22) and then through the stem (6 ) of the bolt nut, the rods (7) and the stem (5) of the head, into the partition (8) passing through the face (14) of the latter. This progressive penetration, piercing the partition (8) from one side to the other, produces the formation of a hole (45) and ends when the flange (12) comes to lie flat against the face (14), anchoring itself in the latter by means of of the teeth (13) or embedded in the face (14) until it is flush with it, as shown in the figure

9. As in the case in which the wall anchors described in document FR-B 2 546 989 are used, the wall anchor (1) according to the invention is selected in such a way that when the flange (12) lies flat on the face (14) or flush with the latter, the rods (7) still in their initial configuration protrude from the hole (45) beyond the face (31) of the partition (8) in more than half of their longitudinal dimension , remaining engaged in the hole (45) in less than half the longitudinal dimension.

This method of obtaining the hole (45), like those to be described with respect to Figures 7 and 8, of course ensures that the hole (45) is coaxial with the wall anchor (1), on the one hand, and On the other hand, the transverse dimensions of the hole (45) are closely adapted to those of the wall anchor (1).

The mutual contact along the axis (4) of the corners in mutual connection of the free sides (21) of the two teeth (18), which define the tip (22), ensures that the geometry of the latter is maintained at along the formation of the hole (45) and that the convexity conferred on each of the teeth (18) contributes to this by stiffening the latter. In particular, the tip (22) remains identical in the position of the wall anchor (1) shown in Figure 9, that is, when the wall anchor has sufficiently penetrated the hole (45) to be self-supporting and be anchored in the face (14) by the flange (12) and the teeth (13) of the latter.

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Figures 7 and 8 show the arrangement of holes (45) by drilling by means of the wall anchor (1) previously placed with respect to the partition (8) in the relative position that has been described with reference to Figure 6, making the drilling by rotating the wall anchor (1) on itself, around the axis (4), with respect to the partition (8).

In the method of use shown in figure 7, the wall anchor (1) is associated for this purpose with a screw (11) whose threaded rod (10), which has the same axis (4) as the anchor wall (1), it is coupled with the internal threading (15) of the stem (6) of the screw nut and has two ends longitudinally opposite each other, integrally contacting one end (33) with the transverse head (34) and then resting flat in direction (19), on the flange (12) around the passage (9) of the stem (5) of the head, and a free end (35) engaged in the coaxial internal threading (15) of the stem (6) of the screw nut or, as shown, formed in the direction (19), with respect to the stem (6) of the screw nut and flange (12), a longitudinal projection of sufficiently small dimensions so that the free end (35) is placed between the teeth (18) without applying any thrust to them which could cause their displacement away from each other and, for example, is not located in contact with teeth (18). The longitudinal dimensioning, for these purposes, of the rod (10) between the ends (33) and (35) depending on the longitudinal emissions of the wall anchor, selected for its part according to the thickness of the partition (8) between its faces (14) and (31), is within the normal capabilities of a person skilled in the art.

With the wall anchor thus arranged by hand, as described with reference to Figure 6, and bringing the screw (11) to the corresponding position just described, A suitable screwdriver (36) is coaxially coupled to the head (34) of the screw (11) which is rotated manually or electrically around the shaft (4) in the circumferential direction (37) which preferably coincides with the threading direction of the threaded rod (10) of the screw (11) into the internal thread (15) of the stem (6) of the screw nut. Due to the contact of the head (34) in the direction (19) against the flange (12), this rotation manifests itself in an identical rotation of the assembly constituted by the screw (11) and the wall anchor (1) around the axis (4) with respect to the partition (8) and in the progressive drilling of the hole (45) in the latter by means of the cutting edges that form the free sides (21) of the teeth (18). The hole (45) obtained is identical to that described with reference to figure 9, as is the relative final position of the wall anchor (1) and the partition (8). Once the flange (12) makes contact in plane on the face (14) or is flush with the face (14) around the hole (45) and anchored in the face (14) by the teeth (13), the screw (11) can be unscrewed, making it possible to obtain a result identical to that described with reference to figure 9.

It will be noted that the methods of using the wall anchor (1) according to the invention, which have been described with reference to Figures 6 and 7, do not use the grooves (30) arranged to receive the screwdriver around the coaxial passage ( 9) of the stem (5) of the head in the flange (12), making the slots (30) optional.

On the other hand, the method of use shown in figure 8 involves the presence of said grooves (30), since in the case of figure 8 the wall anchor (1) according to the invention is used to drill the hole (45 ) by rotation around the axis (4) with respect to the partition (8), under conditions that in this respect are similar to those described with reference to figure 7, but a screw (11) is not previously coupled to the wall anchor (1) and is operated indirectly, by means of the screwdriver (36) arranged coaxially with the wall anchor (1) and in engagement with the grooves (30) , to produce the rotation of the wall anchor (1) around its axis (4) with respect to the partition (8) and the progressive drilling of the hole (45) in the latter. It will be observed that in this case the direction of circumferential rotation of the screwdriver (36) on itself, around the axis (4), and of the rotation of the wall anchor (1) around its axis (4) by the action of the screwdriver (36), it can be the direction (37) corresponding to the threading of a screw in the internal thread (15) of the stem (6) of the screw nut or the opposite direction (38), provided that both sides (21) of each tooth (18) have the shape of a cutting edge and can carry out the same attack function of the material that constitutes the partition (8).

In this case, at the end of the drilling of the hole (45) and the introduction of the wall anchor (1) inside it, the wall anchor (1) adopted the configuration and position with respect to the partition (8) that have been described with reference to figure 9.

Therefore, whatever the method used to make the hole (45) in the partition (8) and to reach the position described with reference to figure 9, the wall anchor (1) according to the invention can be used in the same way, for example as that shown in figures 10 and 11 for anchoring an object (39) that is at least locally flat on the partition (8), so that the locally flat area (40) of the object (39) makes contact in plane against the face (14) of the partition (8).

The object (39) has been shown in the form of an angle iron in Figures 10 and 11 and the locally flat area (40) in the form of an appendix of this angle iron, but no limitation should be inferred with respect to the type of object capable of being anchored in the partition (8) by means of a wall socket (1) according to the invention and a suitable screw (11), the wall anchor according to the invention being capable of all the applications already known for the wall anchors described in document FR-B 2 546 989.

The flat area (40) that has two flat faces (42), (43) parallel and opposite each other and crossed from one to the other of these faces (42) and (43) by the hole (41) arranged along an axis perpendicular to them and which is intended to coincide with the axis (4) common to the wall anchor (1) and to the hole (45), having the through hole (41)

ES 2 274 337 T3 an intermediate diameter between the respective diameters of the threaded rod (10) and of the screw (11) and the head (34) of the latter, the flat part (40) of the object (39) is placed with its face (42) flat against the face (14) of the partition (8) through the flange (12) or against the flange (12) and the face (14) around the flange (12), causing the axis of the hole ( 41), which has not been numbered, coincide with the axis (4). Then, as shown in figure 10, it is coaxially coupled in the hole (41) through the face (43) of the flat area (40), the free end (35) of the threaded rod (10) of the screw (11), then by movement of the screw (11) in the direction (19), the threaded rod (10) is made to pass through the flat area (40) from one side to the other, through the hole ( 41), then the stem (5) of the head and the assembly constituted by the expansions (7), coaxially, until the threaded rod (10) makes contact, with its free end (35), with the internal thread (15) of the stem (6) of the screw nut with which the rod (10) of the screw is brought into engagement threaded by rotation in the appropriate direction (37) with respect to the wall anchor (1) by the action of a coaxial screwdriver (36) on the head (34) of the screw (11). The screw (11), which may be different from the one described with reference to figure 7, has between the ends (35) and (33) of its threaded rod (10) dimensions such that the head (34) makes contact flat on the face (43) of the flat area of ​​the object (39) around the hole (41) or is located cantilevered in a certain longitudinal dimension with respect to the face (43) of the object (39).

Next, the threading of the threaded rod (10) of the screw (11) in the internal threading (15) of the stem (6) of the screw nut is continued by continuing the rotation of the screwdriver (36) in the direction (37 ) around the axis (4), until the head (34) establishes flat contact on the face (43) around the hole (41) in case said positioning has not taken place, then in such a way as to bring the stem (6) of the screw nut longitudinally closest to the stem (5) of the head, against which the head (34) makes longitudinal contact in the direction (19) through the zone flat (40) of the object (39) and the flange (12), thus producing the deformation of the rods (7) in a direction away from the axis (4) and the contact of a part of the rods (7) flat on the face (31) of the partition (8) around of the hole (45), as shown in figure 11, under the same conditions as when using the wall anchors described in document FRB 2 546 989.

As the threaded rod (10) of the screw (11) continues to thread into the internal thread (15) of the stem (6) of the screw nut, the free end (35) of the threaded rod (10) forms a protrusion longitudinally longer and longer, in the direction (19) with respect to the shank (6) of the screw nut and the cap (16) and, therefore, comes into contact with the teeth (18), which causes the gradual separation of the plastic deformation on the corresponding side (20) for connection with the cap (16), by way of a pivoting movement with respect to the cap (16) around an axis defined approximately on the side of corresponding connection (20).

In this way, when the wall anchor (1) reaches its anchoring configuration in the partition (8), which is shown in figure 11, the teeth (16) are moved away from the axis (4), that is, away one from another perpendicular to the axis (4) to which they can be, for example, approximately parallel, as shown.

For reasons of force transmission easily understandable by those skilled in the art, the connection of the teeth (18) along their respective side (20) to the cap (16) may offer little resistance to this relative movement of low separation. the thrust of the free end (35) of the threaded rod (10) of the screw (11) when the teeth (18) occupy their relative position that defines the point (22), the latter being able to have sufficient rigidity to maintain its geometry in the presence of the reaction offered by the partition (8) to the penetration of the wall anchor (1) in the direction (19).

Once the position described with reference to figure 9 of the wall anchor (1) according to the invention with respect to the partition (8) has been reached, of course, the continuation of the placement of the wall anchor (1), is to say in particular the deformation of its rods (7) in the anchoring direction of the partition (8), shown in figure 11, can take place in a different way with respect to that which has just been described with respect to figures 10 and eleven. Therefore, it is possible in particular to use for this purpose, in the absence of the screw (11), a tool of well-known type, used to position and anchor the wall anchors described in document FR-B 2 546 989 or to use the screw (11) for this purpose in the manner described with reference to figures 10 and 11 but without inserting any object between its head (34) and the flange (12) of the wall anchor (1) against which it makes contact , Thus, the head (34) directly in the direction (19) during the rotation of the screw (11) in the direction (37) by means of the screwdriver (36) in order to bring the stem (6) of the screw nut closer to the stem (5) of the head and, therefore, causing the plastic bending of the rods (7) in the direction away from the axis (4), to reach the anchoring configuration shown in figure 11. Then, after having unscrewed the screw (11) that served for the deformation of the rods (7), the object (39) can be fixed to the partition (8) by means of the wall anchor (1) according to the invention, using for this purpose a screw (11) that may be identical to the one that may have been used for the deformation of the wall anchor (1) or that may be different from these.

One skilled in the art will readily understand that although the present invention, in particular the teeth (18) that are characteristic of the same, have been described in relation to a wall anchor which otherwise corresponds essentially to document FR-B 2 546 989, the characteristic arrangements of the present invention could be compatible with any other design of a wall anchor capable of anchoring itself in a similar way to a partition and which, in particular, The precise geometric shape of the rods (7) is independent with respect to the present invention, as is the method of manufacturing the wall anchor (1), although the manufacturing method that has been described, in a single piece starting from a metal strap is the currently preferred embodiment.

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Similarly, one skilled in the art will readily understand that while a number of preferred configurations for teeth 18 have been described, other numbers and / or other configurations could be selected in a satisfactory manner without departing from the scope of the present invention. .