EP3234383A1

EP3234383A1 - Screw and construction

Info

Publication number: EP3234383A1
Application number: EP15808564.7A
Authority: EP
Inventors: Daniel Baudy; Thomas Kistler
Original assignee: Hilti AG
Current assignee: Hilti AG
Priority date: 2014-12-17
Filing date: 2015-12-09
Publication date: 2017-10-25
Also published as: WO2016096570A1; TW201629360A; EP3034895A1; TWI648478B

Abstract

The invention relates to a screw, comprising a drive, a drilling tip for producing a bore having a bore axis and a bore diameter, said drilling tip being spaced apart from the drive in a drive-in direction, and a shaft which extends from the drive to the drilling tip, wherein the shaft has a stop which can be fed through the bore when the drive-in direction of the screw is tilted in relation to the bore axis and which has a stop surface for blocking the feeding of the stop through the bore when the drive-in direction of the screw is aligned parallel to the bore axis.

Description

Screw and construction The present invention relates to a screw and a construction, for example for the insulation of a building wall or a building roof.

Such a screw is known from EP 1 034 379 B1, which has a head, two shank portions with threaded portions of different diameters, wherein a transition acting as a stop is provided between the two shank portions which comes to rest on a thin-walled substructure as a spacer , For spacing fastening of thin-walled parts to the thin-walled substructure, a thread-free region, whose axial length is matched to the thickness of the part to be fastened or to the thickness of the substructure, adjoins the underside of the head and the transition between the two shank sections. These measures are intended to allow a spacer attachment even with thin-walled elements.

The invention is based on the object to provide a screw and a construction with which a spacer mounting of thin-walled parts on a thin-walled substructure is made possible in an alternative manner.

The object is in a screw, comprising a in the setting direction from a shaft beginning to a shaft end extending shaft, arranged on the shaft top drive, arranged on the shaft stop for limiting a setting movement of the screw in the plate-shaped object, a on the Shaft disposed between the stop and the shank end and extending in the setting direction from a thread start to a threaded end first thread, the shank having a in the setting direction from the stop to the thread start extending distance portion, by a in the spacer portion of the Shank arranged second thread solved, wherein an outer diameter of the second thread is smaller than an outer diameter of the first thread and larger than a core diameter of the first thread. The second thread preferably extends counter to the setting direction up to the stop and / or in the setting direction up to the thread start of the first thread. For the purposes of the invention, an external diameter of a thread means the maximum external diameter of the thread. In particular, an outer diameter of the thread in the region of a thread inlet or outlet is not to be understood. Likewise, a thread inlet or outlet of the first thread is not to be understood as a second thread in the context of the invention. Preferably, the second thread has its outer diameter over at least one complete revolution around the shaft. Also preferably, the second thread has its outer diameter over at least one axial length, which corresponds to a thickness of the plate-shaped object.

An advantageous embodiment is characterized in that a pitch of the second thread is as large as a pitch of the first thread.

An advantageous embodiment is characterized in that the second thread is formed as a flat thread. A further advantageous embodiment is characterized in that the second thread is formed as a trapezoidal thread. Preferably, a flank angle of the trapezoidal thread is the same as a flank angle of the first thread. A further advantageous embodiment is characterized in that the second thread is formed as a pointed thread with a flank angle which is greater than a flank angle of the first thread.

Preferably, the screw comprises a drill bit arranged on the shaft end for producing a borehole with a borehole diameter. In one embodiment, the drill bit has a diameter that corresponds to the diameter of the drill hole. In another embodiment, the first thread has a maximum core diameter that corresponds to the diameter of the borehole. The thread core of the first thread may be suitable for expanding the borehole. Particularly preferably, the stop and / or the first thread has one or more cutting edges for widening the borehole. Also preferably, a difference between the outer diameter of the second thread and the borehole diameter is less than 50%, more preferably less than 25% or less than 15%, a difference between the outer diameter of the first thread and the borehole diameter.

A further advantageous embodiment is characterized in that the shank has a kink and / or bow having the stop. Preferably, the kink and / or arch is passable through a wellbore when the set direction of the screw is tilted with respect to the wellbore axis and has an abutment surface for blocking the passage of the stopper through the wellbore when the setting direction of the screw is aligned parallel to the wellbore axis is. Preferably, the screw comprises a screw head, which has the drive and the stop.

In an advantageous embodiment, the screw comprises a between the shaft beginning and the stop or between the threaded end and the shaft end arranged on the shaft further stop for limiting a setting movement of the screw in a further plate-shaped object and between the further stop and the stop and arranged in the setting direction from a further thread start to a further threaded end extending further first thread. Preferably, the shank has a further spacing section extending in the setting direction from the further stop to the further thread start. Particularly preferably, the screw comprises a further second thread arranged in the further spacer section on the shaft, wherein an outer diameter of the further second thread is smaller than an outer diameter of the further first thread and larger than a core diameter of the further first thread. The further first thread advantageously has a larger outer diameter than the first thread. Likewise advantageously, the further first thread has a smaller outer diameter than the first thread.

The object is also achieved in a construction comprising one or more plate-shaped articles having a total thickness, and a screw set in the plate-shaped article, wherein the screw is designed according to one of the preceding claims, wherein the spacer section along the setting direction has a length is substantially equal to the total thickness, and wherein the one or more plate-shaped objects bear against the spacer portion and overall on the stop.

According to an advantageous development, the construction, which is for example a building envelope, furthermore has a cassette web projecting from the base plate, to which the screw is fastened. The base plate then forms a cassette together with the cassette web. Preferably, a material of the base plate, the cassette web and / or the cover plate comprises a metal or an alloy.

The invention will be explained in more detail below with reference to the drawings. 1 shows a detail of a building envelope in a cross section during a fastening,

2 shows the detail of the building envelope after attachment,

3 shows a screw in a side view, 4 a screw in a side view, FIG. 5 a screw in a partial view and FIG. 6 a screw in a partial view.

FIG. 1 shows a cross-section of a building envelope 100 with base plates 120 screwed or nailed to a wall 110, from each of which a cassette web 130 protrudes to form a steel cassette. The cassette webs 130 each have a rectangular angled mounting portion 140. In the cassettes each designed as an insulating 150 insulating element is inserted. Compared to the environment, the insulating member 150 is covered with a cover plate 170, which is fastened by means of a screw 180 on the cassette web 130 on the base plate 120. The cover plate 170 is formed as a steel sheet. In embodiments not shown, the cover plate is made of plastic and / or is formed as a film. The insulating plate 150 has a compressible insulating material, for example mineral wool such as rock wool or glass wool.

The screw 180 has a drive designed as a screw head 182 and a drill bit 181 spaced from the screw head 182 in a setting direction 200 for drilling a first borehole 160 in the cover plate 170 and a second borehole in the mounting area 140. Extending between the drill bit 181 and the screw head 182 of the screw 180 is a shaft 183 which carries in a first threaded portion a self-tapping first thread 184 adjoining the drill bit 181 and a further first thread 185 in a further threaded portion. The further first thread 185 in this case has a larger diameter than the first thread 184. Below the head 182, a sealing disk assembly 186 is mounted with a sealing washer and a cover on the screw shaft 183. In an embodiment not shown, the further first thread has a smaller diameter than the first thread. In a further embodiment not shown, the first and the further first threads have the same diameter.

The screw shaft 183 comprises a stop 187 with a bend 188 of the shaft 183, a stop surface 189 and a bow 190 of the shaft 183. The stop surface 189 is thereby formed due to the bend 188 by a peripheral surface of the shaft 183 and blocked in the in Fig. 1st shown position a passage of the stopper 187 through the first borehole 160. The shaft 183 has everywhere, especially in the region of the stop, a circular cross-section. The shaft 183 has a spacing section 191 between the stop surface 189 and the first thread 184, and a further spacing section 192 between the sealing disk arrangement 186 and the further first thread 185 on. In the spacer section 191, a second thread 193 is arranged on the shaft 183, whose outer diameter is smaller than an outer diameter of the first thread 184 and larger than a core diameter of the first thread 184. By contrast, the further spacer section 192 is thread-free. Along the setting direction 200, the stand-off portion 191 has a length corresponding to a total thickness of the cassette web 130 in the mounting portion 140, so that after setting the screw 180 in the cassette web 130 of the cassette web 130 abuts the spacer portion 191 and in the setting direction 200 between the first thread 184 and the stop 187 is clamped (Fig. 2). To insulate the building envelope 100, the base plate 120 is first attached to the wall 110. Subsequently, the insulating member 150 is applied to the base plate 120 and the cover plate 170 is placed on the insulating member 150 and fixed by means of the screw 180 to the base plate. In this case, the first borehole 160 is drilled first with the drill bit 181 in the cover plate 170, so that the first borehole 160 has a borehole axis that is perpendicular to the surface 171 of the cover plate 170. The borehole diameter of the first borehole 160 is then as large as the outer diameter of the boring tip 181. Subsequently, the screw 180 by means of the first thread 184, which has a larger outer diameter than the drill bit 181 and consequently the first hole 160, screwed so far through the first hole until the stop surface 189 abuts the surface 171 of the cover plate 170. The position shown in Fig. 1 is then reached. A passage of the stop 187 through the first borehole 160 is blocked by the stop surface 189 as long as the setting direction 200 of the screw 180 is aligned parallel to the borehole axis of the first borehole 160, ie perpendicular to the surface 171 of the cover plate 170.

In order to convey the stop 187 through the first borehole 160, the screw 180 is then tilted. In Fig. 1, the screw head 182 is to tilt to the left. Since the diameter of the shaft 183 in the region of the stop 187 does not exceed the borehole diameter of the first borehole 160, the screw 180 can then be pushed further through the first borehole 160. Finally, the screw 180 is tilted back until its setting direction 200 is again perpendicular to the surface 171 of the cover plate 170, and so far inserted through the first hole 160 until the drill bit 181 abuts the mounting portion 140 of the base plate 120. The tilting of the screw 180 is also made possible in that the distance of the cover plate 170 from the mounting portion 140 is greater than the distance between the drive-side end of the drill bit 181 and the stop surface 189 of the screw 180, and in that the insulating plate 150 der der- term movement of the screw 180 yields. Then, a second borehole 260 is drilled in the attachment area 140 by means of the drill tip 181, so that the second borehole 260 also has a borehole axis perpendicular to the surface 171 of the cover plate 170. The borehole diameter of the second borehole 160 is then also as large as the outer diameter of the boring tip 181. The screw 180 is then screwed through the second borehole by means of the first thread 184 until the stop surface 189 abuts against the surface 141 of the attachment region 140. The position shown in Fig. 2 is then reached. A passage of the stop 187 through the second borehole 260 is blocked by the stop surface 189, since the setting direction 200 of the screw 180 is aligned parallel to the borehole axis of the second borehole 160, ie perpendicular to the surface 141 of the mounting region 140. Tilting the screw 180 is no longer possible because the screw 180 is held in both the first borehole 160 and the second borehole 260. In order to continue turning the screw 180, however, the second thread 193 must be deformed in such a way that it can rotate in the second borehole 260 without movement of the screw 180 in the setting direction 200. Due to the deformation, the resistance to the further rotation of the screw 180 increases, so that the person who fixes the screw 180 to the base plate 120, notices that the fastening operation is completed. Since an outer diameter of the second thread 193 is smaller than an outer diameter of the first thread 184, the second thread 193 can be deformed, so that the screw 180 continues to rotate in the second borehole 260 until the head 182 for sealing the borehole 160 in the cover plate 170, the sealing disk assembly 186 presses against the cover plate 170. The second thread 193 remains in engagement with the second borehole 260, possibly even after such deformation, so that the bolt 180 can advantageously be unscrewed out of the building envelope 100, if desired. In addition, the cover plate 170 is only connected to the base plate 120 via the insulation plate 150 and the screw 180. The distance between the base plate 120 and the cover plate 170 is determined solely by the screw 180 and corresponds, relative to the mounting portion 140, the distance between the screw head 182 and the stop surface 189, optionally reduced by the thickness of the washer assembly 186, each seen in the setting direction ,

In Fig. 3, a screw 300 is shown in a side view. The screw 300 has a shaft 305 which extends in a setting direction 320 from a shaft beginning 310 to a shaft end 315. At the beginning of the shaft 310, a screw head 31 1 is arranged with a drive 312 configured as an external hexagon and a head underside 313. At the shaft end 315, a drill bit 316 is arranged to produce a borehole. Furthermore, the screw 300 has an attachment arranged on the shaft 305. beat 325 to limit a setting movement of the screw 300 in an example plate-shaped object. The stopper 325 has a plurality of cutting edges 326 for expanding the borehole.

Between the stop 325 and the shank end 315, a first thread 330 is arranged on the shank 305, which extends in the setting direction 320 from a thread start 335 to a threaded end 340. The shaft 305 has a spacing section 345, which extends in the setting direction 320 from the stop 325 to the thread beginning 335. In the spacer section 345, a second thread 350, which has an outer diameter which is smaller than an outer diameter of the first thread 330 and greater than a core diameter of the first thread 330, is arranged on the shaft 305. The second thread 350 extends counter to the setting direction 320 up to the stop 325 and in the setting direction 320 to the thread beginning 335 of the first thread 330. The pitch of the thread formed as a second thread 350 is as large as the pitch of the first thread 330. Bei not shown embodiments, the pitch of the second thread is greater or smaller than the pitch of the first thread.

The head bottom side 313 forms a further stop, which is arranged between the shaft beginning 310 and the stop 325 on the shaft, for limiting a setting movement of the screw 300 into a further plate-shaped object. Between the head bottom side 313 and the stop 325, a further first thread 360 is arranged, which extends in the setting direction 320 from a further thread start 355 to a further threaded end 365. From the head underside 313 to the further thread beginning 355 extends in the setting direction 320, a further spacer portion 370, which is thread-free. If, during a setting process, the further stop, in this case the head underside 313, comes into contact with the further plate-shaped object while the first thread 330 is still in engagement with the plate-shaped object there, the thread-free further spacing section 370 permits a further rotation of the screw 300, so that the first thread 330 can be screwed so far through the plate-shaped object until the stop 325 comes to the plate-shaped object for investment.

On the other hand, if the stopper 325 abuts the plate-shaped object while the other first thread 360 is still engaged with the other plate-shaped object, further rotation of the screw 300 may cause the thread cut from the first thread 330 into the plate-shaped article deformed by the second thread 350 by over-rotation, wherein the torque to be overcome for the rotation of the screw 300 increases. The screw 300 can therefore still be continued. turn until the further stop formed by the head bottom 313 comes to rest on the other plate-shaped object. Since the deformation of the thread cut from the first thread 330 into the plate-shaped article also has an elastic component in addition to a plastic part, the second thread 350 is then still with the thread cut into the plate-shaped article, so that the screw 300 is always in contact again unscrew from the plate-shaped object, if desired. Advantageously, therefore, the second thread 350 has a thread pitch which is equal to a thread pitch of the first thread 330. The further first thread 360 has an outer diameter which increases counter to the setting direction 320 and is smaller in the region of the further threaded end 365 than the outer diameter of the first thread 330 and in the region of the further thread beginning 355 is greater than the outer diameter of the first thread 330. In embodiments not shown, the screw comprises a further spaced in the further distance portion on the shaft further second thread, wherein an outer diameter of the further second thread is smaller than an outer diameter of the further first thread and greater than a core diameter of the further first thread is.

4, a screw 400 is shown in a side view. The screw 400 has a shaft 405, which extends in a setting direction 420 from a shaft beginning 410 to a shaft end 415. At the beginning of the stem 410, a screw head 41 1 is arranged with a drive 412 designed as an external hexagon and a head underside 413. At the shaft end 415, a drill bit 416 is arranged to create a borehole. Furthermore, the screw 400 has a stop 425 arranged on the shank 405 for limiting a setting movement of the screw 400 into a, for example, plate-shaped object. To form the stop 425, the screw 400 has a bend 426. The kink 426 is feasible through a borehole generated by the drill bit 416 when the setting direction of the screw is tilted with respect to the borehole axis. For this purpose, the diameter of the shaft 405 in the region of the bend 426 is constant. The stop 425 is then formed by a stop surface of the kink 426 and provides for blocking the passage of the stopper 425 through the wellbore, when the setting direction 420 of the screw 400 is aligned parallel to the borehole axis.

Between the stop 425 and the shaft end 415, a first thread 430 is arranged on the shaft 405, which extends in the setting direction 420 from a threaded end 435 to a threaded end 440. The shank 405 has a spacing section 445 which extends in the setting direction 420 from the stop 425 to the thread start 435. In the spacer section 445, a second thread 450 is on the shaft 405 arranged, which has an outer diameter which is smaller than an outer diameter of the first thread 430 and larger than a core diameter of the first thread 430. The second thread 450 extends counter to the setting direction 420 up to the stop 425 and in the setting direction 420 up to the thread start 435 of the first thread 430. The pitch of the second thread 450 formed as a flat thread is as large as the pitch of the first thread 430 In embodiments not shown, the pitch of the second thread is greater or less than the pitch of the first thread.

The head underside 413 forms a further stop, which is arranged between the beginning of the shank 410 and the stop 425 on the shaft, for limiting a setting movement of the screw 400 into a further plate-shaped object. Between the head bottom 413 and the stop 425, a further first thread 460 is arranged, which extends in the setting direction 420 from a further thread start 455 to a further threaded end 465. From the head underside 413 to the further thread beginning 455, in the setting direction 420, a further spacing section 470 extends, which is thread-free. With regard to the function of the spacer section 445 and of the further spacer section 470, reference may be made to the above illustration with reference to FIG. 3 and the spacer section 345 and further spacer section 370 there.

The further first thread 460 has an outer diameter which increases counter to the setting direction 420 and in the region of the further threaded end 465 is smaller than the outer diameter of the first thread 430 and 455 in the region of the further thread start is greater than the outer diameter of the first thread 430th Bei not shown embodiments, the screw comprises a further spaced in the further portion of the shaft arranged further second thread, wherein an outer diameter of the further second thread is smaller than an outer diameter of the further first thread and larger than a core diameter of the other first thread.

Fig. 5 shows a screw 500, which is screwed into a stack of plate-shaped objects 501 and forms a construction together with the plate-shaped objects 501. The screw 500 has a shaft 505 with a self-tapping first thread 530 and a stopper 525. The screw 500 is shown in its set state, so that the first thread 530 has cut a counter thread 531 into the plate-shaped objects during screwing and on the other hand the stop 525 has come into contact with the stack of plate-shaped objects 501.

The first thread 530 extends counter to a setting direction 520 of the screw 500 up to a thread beginning 535. Between the thread start 535 and the stopper 525th The shaft 505 has a spacing section 545 with a second thread 550, wherein the second thread 550 extends in the setting direction 520 from the stop 525 to the thread beginning 535. In non-illustrated embodiments, the second thread is spaced from the stop and / or the thread root. The outside diameter d2 of the second thread 550 is smaller than the outside diameter d1 of the first thread 530 and larger than the core diameter dK of the first thread 530. The core diameters of the first thread 530 and the second thread 550 are the same. In embodiments not shown, the core diameter of the second thread is larger or smaller than the core diameter of the first thread. The second thread 550 is formed as a trapezoidal thread having a flank angle which is the same as a flank angle of the first thread 530. Also, since the thread pitches of the first thread 530 and the second thread 550 are the same, the second thread 550 can be screwed without increased resistance by the mating thread 531. The second thread 550 remains engaged with the mating thread 531 even after over-tightening, so that the screw 500 can be unscrewed out of the plate-shaped objects 501 again. Although the counter thread 531 deforms during over-rotation, the second thread 550 remains in engagement with the counter thread 531 due to the elastic portion of this deformation.

6 shows a screw 600, which is screwed in a setting direction 620 into a stack of plate-shaped objects 601 and forms a construction together with the plate-shaped objects 601. The screw 600 has a shank 605 with a self-tapping first thread 630 extending in the setting direction 620 from a thread start 635 to a thread end, not shown, and a stop 625. The screw 600 is shown in its set state, so that the first thread - De 630 has cut a counter-thread 631 in the plate-shaped objects during screwing and on the other hand, the stop 625 has come to the stack of plate-shaped objects 601 in Appendix.

Furthermore, the shaft 605 between the stop 625 and the threaded end 635 has a spacer portion 645 with a second thread 650. The screw 600 differs from the screw 500 shown in FIG. 5 in particular in that the second thread 650 is designed as a pointed thread with a flank angle that is greater than a flank angle of the first thread 630. Also, since the thread pitches of the first thread 630 and the second thread 650 are the same, the second thread 650 can be screwed without increased resistance by the mating thread 631. Since the second thread 650 of the screw 600 with the mating thread 631 even after a Over-tightening remains engaged, the screw 600 can be screwed out of the plate-shaped objects 601 again.

The invention has been described with reference to the example of a building insulation. It should be noted, however, that the screw according to the invention is also suitable for other purposes.

Claims

PATENT APPLICATIONS

1 . A screw for seating in a plate-shaped object in a setting direction, comprising a shaft extending in the setting direction from a shaft beginning to a shaft end, a drive arranged on the shaft beginning, a stop arranged on the shaft for limiting a setting movement of the screw into the plate-shaped object a first thread disposed on the shank between the stopper and the shank end and extending in the setting direction from a thread start to a threaded end, the shank having a spacer section extending in the setting direction from the stopper to the thread start, and an in the second portion disposed on the shaft second thread, wherein an outer diameter of the second thread is smaller than an outer diameter of the first thread and larger than a core diameter of the first thread.

2. Screw according to claim 1, wherein the second thread extends counter to the setting direction up to the stop.

3. Screw according to one of the preceding claims, wherein extending the second thread in the setting direction to the thread start of the first thread.

4. Screw according to one of the preceding claims, wherein a pitch of the second thread is as large as a pitch of the first thread.

5. Screw according to one of the preceding claims, wherein the second thread is formed as a flat thread or trapezoidal thread, in particular with a flank angle which is equal to a flank angle of the first thread.

6. Screw according to one of claims 1 to 4, wherein the second thread is formed as a Spitzgewin- de with a flank angle which is greater than a flank angle of the first thread.

A screw as claimed in any one of the preceding claims, comprising a drill bit disposed on the shank end for producing a wellbore having a bore diameter, in particular the stopper having one or more cutting edges for expanding the bore hole.

8. Screw according to one of the preceding claims, wherein the shaft has a stop having kink and / or bow.

9. Screw according to one of the preceding claims, further comprising a screw head, which has the drive and the stop.

10. Screw according to one of the preceding claims, further comprising a between the shaft beginning and the stop or between the threaded end and the shaft end arranged on the shaft further stop for limiting a setting movement of the screw in a further plate-shaped object and between the further stop and the Stop arranged and extending in the setting direction from another thread start to a further threaded end further first thread.

1 1. A screw according to claim 10, wherein the shank has a further spacing section extending in the setting direction from the further stop to the further thread start.

12. The screw according to claim 1, further comprising a further second thread arranged in the further spacer section on the shaft, wherein an outer diameter of the further second thread is smaller than an outer diameter of the further first thread and greater than a core diameter of the further first thread ,

13. Screw according to one of claims 10 to 12, wherein the further first thread has a larger outer diameter than the first thread.

14. Screw according to one of claims 10 to 12, wherein the further first thread has a smaller outer diameter than the first thread.

A construction comprising one or more plate-shaped articles having a total thickness, and a screw set in the plate-shaped article, the screw being according to one of the preceding claims, wherein the stand-off section along the setting direction has a length substantially equal to that of FIG Total thickness corresponds, and wherein the one or more plate-shaped objects abut the spacer portion and the total of the stop.