Fastener with guiding washer.

The invention relates to a fastener to be driven into hard receiving materials such as metal and the like., Having a means for rotary drive head, one provided with a guide Rondelle shaft and in the driving because subsequent tip, wherein the shaft is provided at least in its rear end portion with thread is.

For the series mounting in particular sheets of existing example of steel beams supporting structures so far mainly the so-called direct mounting is known in which a brand-like fastener mostly using Explosively by the joining plate and into the substructure, that is driven into the carrier. This method is efficient and leads to high Befestigungsqualtität, since there is a cold weld the fastening element to the substructure. The driving of the fasteners by Explosively is also independent of power supply systems, such as a pneumatic or electric power. However, such fasteners are usually solved only by destroying the sheets.

A further known type of attachment series of sheets, the use of screws. In this self-tapping are used today mostly having a cutting bit with which they drill the hole in the plate and in the substructure itself and then cut a thread. While such fasteners are releasably requires drilling and tapping a lot of time and network dependent drilling and / or bolting.

From DE-OS 24 21 937 for the aforementioned cases a fastening method known which rely in by driving a fastening element on the one hand by the plates and the other by the substructure through the most te teaching of direct mounting. The final anchoring of the fastening element is done manually, using conventional tools, such as wrenches and the like. The well-known for this method of attachment fastener has a head having means for rotary entrainment, a shank with guide Rondelle and thread.

While these known fastening method has the advantage that it is independent of supply systems on the type of Direct mounting, is the serious disadvantage in the high time and manipulation effort because two operations are strung together, which should be carried out with each specially provided tools, on the one hand the through blowing operation means a powder actuated setting tool and the other hand the actual anchoring operation by torque-applying tools.

From DE-OS 35 18 517 a driving-in device is known which is constructed in the manner of a powder actuated setting tool and is able to perform an axial movement, and after covering a certain axial travel at least a rotary movement, possibly superimposed on a further axial travel executes. For this purpose, the drive means comprises a double piston consisting of a piston shaft and a ring piston. The function is carried out in such a way that are accelerated at the start of the driving operation shaft and piston ring piston along the shaft and piston granted rotation under braking the shaft piston, the annular piston. It is thus possible to place with this known drive device self-tapping screws, in that they are for the time being axially driven through the sheets and the substructure through and decelerate the shaft piston depending Eintreibwiderstand so under rotationally positive connection between the shaft piston and fasteners latter rotary motion to eventual screwing is granted.

The problem with fastener-driving means of this known drive means is that depending on the resistance, which is met with by the metal sheets and the substructure the fixing member, a braking of the piston shaft does not always take place to the same degree. This may cause the fastener is screwed to little to premature braking of the shaft piston, or where little Eintreibwiderstand braking the shaft piston is so late that the still high drive device side power allows a sufficient tightening of the fastener.

The invention is accordingly based on the object to provide for the aforementioned, operating like a powder actuated setting tool drive device, a fastening element that is different resistance of panels and substructure, always sufficient anchoring values ​​guaranteed at different operational conditions.

According to the invention the object is achieved in that the guide Rondelle is designed like a hood, where the bottom is in threaded connection with the shank and is spaced from the eintreibrichtungsseitigen face of the head and the eintreibrichtungsseitige end side of the rim overhangs the eintreibrichtungsseitige face of the ground in the driving direction.

When setting the inventively proposed fastener means of the drive device known from DE-OS 35 18 517 is carried out in a first operation, an axial through driving the fastener shank through the sheets and the substructure through. Decisive for this is the shaft of the known piston drive mechanism. The decisive for the application of the rotary motion to the fastener shank deceleration of the piston is in accordance with the invention proposed fastener now by the dome-like design guide rondelle supported. If at high Eintreibwiderstand the fastener braking very early, ensures the hood-like shape of the guide Rondelle for a sufficient pressing of the sheets to the substructure. Is the Eintreibwiderstand the fastener on the other hand low, the hood-like guide Rondelle makes when struck its edge for a sufficient braking of the shaft piston, for even higher energy available this takes place under deformation of the hood-like shape of the guide Rondelle. After the counter to the driving direction seen beginning of the thread is located in the region of the guide Rondelle, it is ensured that upon impact of this thread on the sheets and the substructure, the braking of the shaft piston is so high that a superposition of the rotational movement takes place sufficiently. Thanks to the hood-like design of the guide Rondelle is thus ensured that in all applications, a sufficient pressing of the plates is given and the other, a tearing of the threaded connection is avoided through not braking the shaft piston.

Advantageously, the bottom of the guide in the field of Rondelle against the drive-seen beginning of the thread is arranged. This ensures that at low Eintreibwiderstand, ie when the shaft piston forth nor high energy is available, has already taken place, a sufficient braking when the beginning of thread impinges on the sheets and the substructure. The fastener is thus able to form his thread in the sheets and the substructure itself. Also characterized a possibility is created to provide a threaded connection between leadership Rondelle and fastener, which further contributes to keep the braking effect so high that the fastener a aureichende rotary motion is imparted.

The guide Rondelle preferably has an up off the ground conically widening in the driving wall area, which means that on the one hand on the sheets with a wide, leading to high Ueberzugswerten bearing surface formed on the other hand the connection ensures between the shank of the fastener and the guide Rondelle undergone sufficient ,

From the viewpoint of deformation of the cone angle is this conically flaring wall portion, for example, 80 ° to 120 °. In addition, a wall thickness that increases towards the edge further acts of advantageous. Thanks to this design of the wall thickness, which may increase in the order of 10 to 20%, is the risk of weakening the leadership Rondelle during the driving operation, for example due to wear and tear, inhibited.

is according to a further embodiment of the invention in the driving direction then having the means for rotary driving head a connected via a predetermined breaking web, arranged a stop shoulder forming head on the fastening element. This predetermined breaking web forms a kind of overload clutch, by ensuring even at extraordinarily low Eintreibwiderstand the fastener that at still high, standing by the drive device available energy, the torque does not lead to a wrenching of the fastening element, but only by separating the frangible web and thus the means to rotational drive having head shears off. The shaft piston can thus in still existing energy on the part of the drive device, even when not reversed connection between the upper piston and the means for rotary driving head having loose spin.

The invention will be described in greater detail with reference to, for example, reproducing drawings. Show it:<ul><li>FIG. 1 an inventive fastener, partially shown in section, in releasing ready state, </li><li>FIG. 2, the fastener according to FIG. 1 in finished anchored state</li><li>Fig. 3 shows another embodiment of an inventive fastener.</li></ul>

That of FIG. 1 and 2 visible, generally designated 1 fastener includes a cylindrical head 2, a shaft 3 and on which, the head 2 opposite end of the shaft 3 on a tip 4. The shaft 3 is provided with a threaded fifth In the front area of ​​the shaft 3, the thread 5 is to a paragraph 6 partially filmed. The head 2 is provided with saw-toothed rotary drive slots. 7 At a distance A from the eintreibrichtungsseitigen face 8 of the head 2 a, generally designated 10 lead Rondelle disposed. The guide Rondelle 10 is formed of a hood. A bottom 11 of the guide Rondelle 10 is engaged with the thread 5 on the shaft 3. The eintreibrichtungsseitige end face of the edge 12 of the guide Rondelle 10 projects beyond the bottom 11 in the driving direction. The guide Rondelle 10 has an extending from the bottom 11 in the driving away conically widening wall section. 13 The cone angle B of the driving-in conically widening wall portion is between 80 and 120 °. The wall thickness S of the wall portion 13 takes the edge 12 to go.

In the finished fastener shown in FIG. 2, the fastening element 1 to be fixed two plates 15, 16 as well as an underlying substrate has penetrated 17th The fastener has thereby formed a thread in support 17th The guide Rondelle 10 was further screwed in the setting process to the shaft 3 until it finally reaches the eintreibrichtungsseitigen face 8 of the head 2 to the plant. The guide Rondelle 10 was also deformed by flattening. This screwing and subsequent deformation of the guide Rondelle 10 possibly present About energy is dissipated.

The 3 seen in FIG., Generally designated 21 fastener primarily corresponds to the embodiment shown in FIG. 1 and 2. It also has a head 22, a shank 23 and a tip 24th The shaft 23 is provided with a thread 25 and a shoulder 26th The head 22 has rotary driving grooves 27th The guide Rondelle 10 is also arranged at an axial distance A from the eintreibrichtungsseitigen end face 28 of the head. Unlike the embodiment shown in FIG. 1 and 2 but then having the means for rotary driving head 22 is arranged another, connected via a frangible web 29, a stop shoulder-forming head 30 in the driving direction. When the setting process is sheared after the complete screwing of the fastening element of the means having the rotary drive head 22 at the predetermined breaking web 29th The remaining head 30 has no means for rotational driving. The mounting is thus no longer be solved without special aids.