Drop-in anchor and drop-in anchor systems

Internal forced expansion screw and internal forced expansion screw system

The utility model relates to an internal forced expansion screw system and an internal forced expansion screw.

Internally-expanded expansion screws used, for example, to fasten items to masonry, typically include a sleeve placed in a pre-drilled hole. The plug is driven into an expandable portion of the sleeve, which expandable portion secures the sleeve in the hole when expanded. The article may be secured to the masonry by the threaded end of the sleeve opposite the expandable portion of the sleeve.

In a typical internal-forced expansion screw, the plug is frusto-conical to provide an outer surface that matches the inwardly tapering inner wall of the sleeve. This situation has been understood to be the most effective construction for internally expanding screws, because angled surfaces have been understood to coordinate with each other to achieve the desired effect, while using angles to make insertion as easy as possible. However, the prior art internally-expanded expansion screws require a considerable seating force, which is usually obtained by applying a relatively large number of blows with a heavy hammer.

The utility model provides an internal forced expansion screw, comprising: a tubular sleeve having a first end and an expandable second end; and a first surface portion of at least one first end in a longitudinal direction of the sleeve. The first end protrudes relative to the second surface portion of the first end; and a plug that can be inserted into the sleeve so that when the plug is driven into a mounting position in the sleeve, the above The second end expands, and the installation tool can interact with the first surface portion of the at least one first end. To provide a visual indication that the plug is in the mounting position.

The utility model comprises an internal forced expansion screw, comprising: a tubular sleeve having a first end and an expandable second end, wherein the sleeve includes one or more protruding surfaces at the first end; A plug that can be inserted into the sleeve such that when the plug is driven into the mounting position in the sleeve, the second end expands and the installation tool interacts with the one or more protruding surfaces, In order to provide a visual indication of the above-mentioned internal forced expansion screw engaging the workpiece.

According to the internally-expanded expansion screw of the present invention concept, the first surface portion of the at least one first end is provided with a coating, and the visual inspection indicates a change in the coating.

According to the internally-expanded expansion screw of the present inventive concept, the above-mentioned variation includes at least a partial removal of the above-mentioned coating.

According to the internal forced expansion screw of the present invention, the coating is paint.

According to the internally-expanded expansion screw of the present invention, the paint is dark blue.

According to the internally-expanded expansion screw of the present invention, the coating can change color in response to the engagement with the mounting tool, and the visual inspection indicates a change in the color of the coating.

According to the internally-expanded expansion screw of the present inventive concept, the first surface portion of the at least one first end is provided on a deformable component, and the visual inspection indicates that the deformation of the component is included.

According to the internal forced expansion screw of the present invention, the first surface portion of the at least one first end is defined by a dome-shaped tooth.

The utility model provides an internal forced expansion screw system, which includes the above. The internal forced expansion screw and the installation tool, the installation tool can be engaged with the tail end of the plug to drive the plug into the installation position.

According to the internal forced expansion screw system of the present invention concept, the installation tool includes: a drill bit to form a hole in the workpiece to receive the tubular sleeve; and a placement tool having a bag to at least partially receive the drill bit and The top end has an end surface to engage the aforementioned tail end of the plug.

According to the internally-expanded expansion screw system of the present invention, the mounting tool has a shoulder to engage the first surface portion of the at least one first end to provide the interaction.

According to the internally-expanded screw system of the present inventive concept, the drill bit and the setting tool are provided with a complementary slot and protrusion system operable to releasably fix the drill bit to the setting tool.

The beneficial technical effect of the internal-forced expansion screw and the internal-forced expansion screw system according to the present invention is that it can use a large number of standard 16 or 20 ounce hammers that are substantially smaller than the hammers required by the related-art internal-forced expansion screw To insert the plug into the installation position and serve as a visual indicator of the internal expansion screw engaging in the masonry through the removal of the coating to provide interference with the design of the casing, which in turn provides sufficient design for the hole wall Interfering casing design expands.

FIG. 1 shows an internal forced expansion screw 10. The expansion screw 10 includes a sleeve 12. The cannula 12 is generally tubular and is radially expandable at the inflated end 14. To achieve expansion capability, the sleeve 12 includes one or more expansion openings 16 extending from the expanded end along the length 18 portion of the sleeve 12 or other similar structures that allow the sleeve diameter to increase at the expansion end 14. One of the casing 12 The inner wall 20 in this embodiment includes a thread 22 at a threaded end 24 opposite to the expansion end 14 to receive a threaded fastener (not shown) to install the expansion screw once, for example, in a concrete masonry building At that time, the required items are fixed to the expansion screw 10. It will be understood that although it is common for internal-force type expansion screws to have internal threads (ie, threads on the inner surface of the sleeve 12 as shown in FIG. 1), it is also possible to place the threads 22 on the outer surface of the sleeve 12 on. If the thread 22 is provided as an external thread, the sleeve 12 should be configured to extend beyond the surface of the masonry (protruding the surface of the masonry) when installed.

The expansion screw 10 includes a plug 26 that can be inserted into the sleeve 12 from the threaded end 24. In certain embodiments, the diameter 28 of the sleeve 12 at the expanded end 14 allows the plug 26 to be inserted into the sleeve 12 only from the threaded end. The inner diameter of the sleeve is tapered in the expanded portion 98. That is, the inner diameter of the sleeve is increased by the sleeve angle 30 in the direction from the expansion end 14 to the threaded end 24 to define the inner taper 96 so that the plug 26 interferes with the sleeve 12 in the expansion portion 98 . Therefore, when the plug 26 is driven into the expansion end 14, the expansion portion 98 expands to fix the sleeve 12 in the concrete masonry building. The plug 26 has a front end or tip 32 located closest to the expanded end 14 and a head end 34 located closest to the threaded end 24. In some embodiments, the plug 26 is a generally cylindrical body having a generally constant diameter from the tip 32 to the head end 34. In other embodiments, the plug 26 has a slight taper at a plug angle 36 in a direction from the head end 34 toward the tip 32.

In the embodiment shown in FIGS. 1 and 2, the plug angle 36 and the sleeve angle 30 are substantially different, where the sleeve angle 30 is greater than the plug angle 36. This difference reduces the contact area 38 between the plug 26 and the sleeve 12 compared to the contact area of the prior art internally-expanded screw. In some embodiments, access The contact surface may be generally a circular, flat contact surface. The difference between the sleeve angle 30 and the plug angle 36 determines the size of the contact area 38. In some embodiments, the difference between the cannula angle 30 and the plug angle 36 is about 1 degree or greater, such as 1.5 degrees. This condition ensures a minimum contact area 38 between the sleeve 12 and the plug 26. The reduction of the contact area 38 reduces the friction between the sleeve 12 and the plug 26, thereby reducing the amount of force required to place the plug 26 in the mounting position 40 shown in FIG. However, once the plug 26 is driven into the installation position 40, the difference between the sleeve angle 30 and the plug angle 36 is substantially zero, where the sleeve and the plug come into contact due to the deformation of the expansion portion 98. In some embodiments, the tapered portion of the plug 26 is located at or adjacent to the relatively narrow end of the inner taper 96 when in the mounting position 40 to avoid restricting the sleeve when the plug 26 is driven into the mounting position 40 12 full expansion.

In some embodiments, the friction may be reduced enough to allow the plug 26 to be driven into the installation by using a large number of blows using a standard 16 or 20 ounce hammer that is substantially smaller than the hammers required by prior art internally-expanded expansion screws. Position 40. In addition, in some embodiments, a conventional electric hammer drill (not shown) may be used to successfully place the internal expansion screw without using any other driving method. However, it will be appreciated that any suitable placement tool may be utilized. Embodiments of the internally-expanded expansion screw 10 may include those internally-expanded expansion screws with a sleeve having an outer diameter between about 1/4 "and 3/4" (approximately 6.35 mm and 19.05 mm). In addition, because the taper of the plug or the difference between the tapered sleeve angle 30 and the plug angle 36 is lacking, when the plug 26 is driven toward the expansion end 14, the plug 26 makes the material of the expansion portion 98 in line with the prior art The conical plug 26 deforms radially outwards instead. In the prior art conical plug 26, the sleeve material is bent around the taper of the plug. This condition results in an expanded sleeve 12, which generally has an expanded portion 98 Upper linear outer surface. This linear outer surface sleeve 12 increases the ultimate load that the internally forced expansion screw 10 can withstand when compared to prior art expansion screws with tapered plugs of similar maximum diameter.

Referring again to FIG. 1, the tip 32 of the plug 26 may include a chamfer 42. A chamfer 42 is included to facilitate easier movement of the plug 26 into the mounting position 40 by preventing the plug 26 from tripping over the inner wall 20 of the sleeve 12 when being driven. The chamfer 42 is small, so no expansion is lost due to the decrease in the diameter of the plug 26 caused by the presence of the chamfer 42. In addition, in some embodiments, the plug 26 is driven into the installation position 40 so that the chamfer 42 is located at the inner taper 96 to maintain the maximum expansion of the sleeve 12.

Referring now to FIG. 3, some embodiments include a retainer 44. The retainer 44 is inserted into the sleeve 12 from the threaded end 24 after the plug 26 is inserted. The retainer 44 prevents the plug 26 from being accidentally removed from the sleeve 12 before the plug 26 is driven to place the internally-expanded expansion screw 10. Because the plug 26 is loosely received in the cannula 12, it is common for the plug 26 to fall out of the cannula 12 during shipping, storage, or just prior to deployment. This is at least troublesome, and if the plug 26 is not found successfully, it may affect the efficiency or success of the scene. The retainer 44 is positioned within the cannula 12 to prevent the plug 26 from leaving, and in some cases the retainer 44 can be pushed deep into the cannula 12, which prevents or prevents the plug 26 from moving to any Considerable degree. Limiting the movement of the plug 26 in this manner has the added benefit of reducing the noise associated with the pushing of the cannula 12 and the plug 26.

The retainer 44 is formed of a relatively durable material including at least moisture resistance. Although the material is a plastic material (eg, polyethylene) in one embodiment, it can be replaced with metal, wood, rubber, or other suitable materials. The retainer 44 is molded or otherwise formed, for example, die punched, stamped, extruded, or cut Cut. In some embodiments, the retainer 44 is generally disc-shaped, while in other embodiments, it may be replaced with other shapes without departing from the scope of its disclosure, such as partially spherical, square, triangular, Pentagonal or lenticular. Finally, any shape that can be positioned relative to the cannula 12 and the plug 26 to prevent or substantially prevent the plug 26 from leaving the cannula 12 can be used. As shown in FIG. 3, the retainer 44 is configured such that when the retainer 44 is inserted into the sleeve 12, the outer periphery 46 of the retainer 44 engages the thread 22 of the sleeve 12. However, it will be appreciated that in other embodiments, the perimeter 46 of the retainer 44 may frictionally engage the crests of the threads 22 to secure the retainer 44 in the sleeve 12.

Certain embodiments of the retainer 44 include a protrusion 48 that extends out of a plane defined by a perimeter 46 of the retainer 44. In some embodiments, the protrusion is located substantially at the center of the retainer 44. As shown, the protrusion 48 may be frusto-conical. In other embodiments, the protrusions 48 may have other shapes. For example, as shown in FIG. 4, the protrusion 48 may be at least partially spherical. Referring to FIG. 5, in some embodiments, the retainer 44 includes one or more fingers 50 extending outwardly from a central portion 52 of the retainer 44. In the embodiment of FIG. 5, the retainer 44 includes four fingers 50 equally spaced around the retainer 44. It will be appreciated that in other embodiments, other numbers of fingers 50 may be included, such as three, six, or eight fingers 50. The fingers 50 make the outer periphery 46 of the retainer 44 more flexible, thereby allowing the retainer 44 to more reliably engage the helical thread 22 of the sleeve 12. In addition, because the structure of the fingers 50 necessarily forms a notch in the material, there is no need to cross the threads 22 of the sleeve 12 by the retainer 44. The truth is that the fingers 50 can each fully engage in the grooves of the thread 22 without extending beyond the tooth tips of the thread 22. When compared with the retainer 44 without the fingers 50, with the retainer 44 attached, the fingers 50 are further The amount of force necessary to place the plug 26 is reduced. It will be appreciated that a single notch in the perimeter 46 of the retainer 44 will also achieve the result of full engagement and avoiding the crests of the threads 22 from intersecting.

Referring now to FIG. 6, certain embodiments of the internal expansion screw 10 are configured to be mounted by a unique mounting tool 54. The mounting tool 54 includes a drill bit 56. The drill bit 56 includes a shaft 58 disposed at a connection end 60 that is configured to fit in, for example, a chuck (not shown) of a conventional electric hammer drill (not shown). The drill end 62 is configured as a drill having a pointed tip 64 and a chip flute 66. The head ferrule 68 is located between the drill end 62 and the connection end 60.

The mounting tool 54 includes a tool sleeve 70 that can be secured to the drill bit 56 and includes a tool pocket 76 at a first end 78 of the tool sleeve 70. The tool pocket 76 is generally tubular, and in some embodiments, the tool pocket 76 is a cylindrical structure into which the drill bit 56 can be inserted and secured. To secure the tool sleeve 70 to the drill bit 56, certain embodiments include one or more elements at the head ferrule 68, such as one or more slots 72, which may extend inwardly into the tool pocket 76 One or more protrusions 74 (pins, rods, etc.) of the tool sleeve 70 are engaged. The one or more slots 72 may have any shape along their length to facilitate retaining one or more protrusions 74 therein. For example, the slot 72 may be j-shaped, z-shaped, or s-shaped. In certain embodiments, the protrusion and slot arrangement may be substantially opposite, with the protrusion 74 extending outward from the head ferrule 68 and housed in a slot 72 disposed in the tool sleeve 70. Although one slot 72 is shown, it will be understood that other numbers of slots 72 and protrusions 74 may be used, such as two, three or more slots 72 and protrusions 74. Additionally, certain embodiments include a biasing member located in the tool pocket 76 to bias the drill bit 56 away from the tool sleeve 70 to assist in securing the protrusion 74 to the slot 72 in. The biasing member shown is a block of resilient material (e.g., rubber). It will be appreciated that other types of biasing members may be used, such as a spring located in the tool pocket 76. Although the projection and slot connection arrangement described between the tool sleeve 70 and the drill bit 56 is described herein, it is merely an example, and other connection arrangements may be used. The tool sleeve 70 includes a mounting tool tip 80 at a second end 82 of the tool sleeve 70. The tool tip 80 is used to drive the plug 26 into the mounting position 40 to expand the sleeve 12.

The installation tool 54 is used to install the internal expansion screw 10 as shown in FIGS. 7 and 8. Initially, the shaft 58 is mounted in a drill chuck (not shown) and fixed therein. Then, the drill bit 56 is used to drill a hole 84 of a certain size to accommodate the internal forced expansion screw 10.

Once the internal expansion screw 10 is inserted into the hole 84, the plug 26 must be driven into the mounting position 40 (FIG. 2) to expand the sleeve and engage the wall 86 of the hole 84. To achieve this, the tool sleeve 70 is mounted on the drill bit 56 by inserting the drill bit 56 into the tool bag 76 and inserting the protrusion 74 into the slot 72 to fix the tool sleeve 70 on the drill bit 56. In some embodiments, the head ferrule 68 is located on the tool sleeve flange 100 when the protrusion 74 engages in the slot 72. The plug 26 is driven into the mounting position 40 via the tool tip 80 by using the mounting tool 54 thus configured. In order to drive the plug 26 into the mounting position 40, a force is transmitted into the tool sleeve through the drill 56, and the force is transmitted to the tool tip 80 acting on the plug 26 via the ferrule 68 and the tool sleeve flange 100. The installation tool 54 only needs to be installed into the chuck once during the installation process. The hole 84 can be drilled by the drill bit 56 and then the internal expansion screw 10 is installed using the tool sleeve 70 without installing a second tool in the chuck. This provides a simpler and faster installation process that requires less time to drill holes 84 and The tool is switched between the plugs 26.

In each of the embodiments shown, the sleeve 12 includes one or more protruding elements, such as, for example, dome-shaped teeth outside the threaded end 24. Although in each embodiment there are four domed teeth spaced equally around the threaded end 24, it will be appreciated that other embodiments of the internally-expanded expansion screw 10 may utilize other numbers and / or spaced domed teeth. The dome-shaped teeth define respective surface portions at the threaded end 24 protruding in the longitudinal direction of the sleeve with respect to the second surface portion 94 of the first end disposed between the dome-shaped teeth. It will be appreciated that the second surface portion of the convex first end may alternatively be defined by a recess, slot or slit provided in the threaded end 24.

Before the plug 26 is driven into the installation position, for example, when the sleeve 12 is manufactured, at least a portion of the sleeve 12 including the dome-shaped teeth is coated with a coating having a color that is in contrast to the color of the base material of the sleeve 12. Floor. In some embodiments, the coating is a blue paint. However, it will be appreciated that the use of blue paint is exemplary only, and other colors of paint and / or other types of coatings may be utilized. When the plug 26 is driven into the mounting position, the head tip 80 has a length such that when the plug 26 reaches the mounting position 40, the head shoulder 102 (FIG. 8) is configured to contact the dome-shaped teeth. As the head and shoulder 102 rotates relative to the casing through the action of an electric hammer drill or the like, and at the same time comes into contact with the dome, the coating is worn away from the dome, thereby exposing the casing 12 under the coating. colour. The removal of the coating by the head and shoulders 102 serves as a visual indicator that the internally-expanded expansion screw 10 engages in the masonry. That is, the plug has been inserted deep enough into the sleeve to provide design interference with the sleeve, and in turn provides a design expansion of the sleeve sufficient to provide design interference with the wall of the hole, the hole having internal forces The expansion screw is designed for a diameter corresponding to the size of the hole therein. In other embodiments, the visual indicator may be, for example, deformation of the protruding element by a mounting tool or due to The color of the coating applied to the protruding element upon contact of a reactive coating on a heated element (for example) on a placement tool changes.

It will be understood that the described and illustrated embodiments are merely examples and are not to be taken as limiting, and the scope of the present invention is limited only by the scope of the scope of patent application.

<p>10 Internal Forced Expansion Screw</p><p>12 Casing</p><p>14 second end (expanded end)</p><p>16 Expansion opening</p><p>18 length</p><p>20 inner wall</p><p>22Thread</p><p>24First end (threaded end)</p><p>26plug</p><p>30 Casing cone angle</p><p>32 (inflated) front</p><p>34 (of thread end)</p><p>36plug taper angle</p><p>38contact area</p><p>40Mounting position</p><p>42Chamfered</p><p>44 retainer</p><p>46 (of the retainer)</p><p>48 protrusion</p><p>50 fingers</p><p>52 (guard ring) central part</p><p>54Installation tools</p><p>56drill</p><p>58axis</p><p>60Connector</p><p>62drilling end</p><p>64 pointed tip</p><p>66Dust Chute</p><p>68 Headband</p><p>70tool casing</p><p>72 Slot</p><p>74 protrusion</p><p>76tool bag</p><p>78 (of the tool sleeve) first end</p><p>80Tool Top</p><p>82 (tool sleeve) second end</p><p>84hole</p><p>86 wall</p><p>92 the first surface portion of the first end</p><p>94 the second surface portion of the first end</p><p>96Inner taper</p><p>98 Expansion</p><p>100 Casing flange</p><p>102Head, shoulders</p>

In order to better understand the present utility model, certain embodiments of the present utility model, which are given by way of example only, will now be described with reference to the drawings, in which: FIG. 1 is a cross section of an embodiment of an internally forced expansion screw Figure 2 is a cross-sectional view of an embodiment of an internal-forced expansion screw with a plug in an installed position; Figure 3 is a cross-sectional view of an embodiment of an internal-forced expansion screw including a retainer; and Figure 4 is a Cross-sectional view of another embodiment of an internally-expanded screw; Figure 5 is a plan view of an embodiment of a retainer; Figure 6 is a cross-sectional view of an embodiment of a mounting tool; Figure 7 is a mounting tool configured for drilling And FIG. 8 is a cross-sectional view of an embodiment of an installation tool configured to drive a plug.