EP1353779A2

EP1353779A2 - Device for screwing in fastening elements

Info

Publication number: EP1353779A2
Application number: EP02702295A
Authority: EP
Inventors: Daniel Gasser
Original assignee: SFS Intec Holding AG
Current assignee: SFS Group International AG
Priority date: 2001-01-22
Filing date: 2002-01-22
Publication date: 2003-10-22
Anticipated expiration: 2022-01-22
Also published as: DE50209475D1; AU2002235860A1; WO2002057434A3; PL197271B1; EP1353779B1; EA200300818A1; PL366611A1; WO2002057434A2; EA004484B1; ATE353740T1; US20040045413A1

Abstract

The invention relates to a device for screwing in fastening elements that consist of a plastic retainer (13) and a premounted screw (11). The inventive device is further characterized by a screw device (6) and a screwdriver (5). The screw device (6) comprises two tubular elements (58, 59) that are coaxially inserted one into the other. The extent to which they engage with each other can be adjusted and the tubular elements (58, 59) can be interlocked in the adjusted position. The tubular element (58) is further provided with a stop element (62) comprising a stop boss (63') which interacts with a stop screw (63).

Description

Subject: Device for screwing fasteners

The invention relates to a device of the type specified in the preamble of claim 1.

In devices of this type for setting fastening elements made of plastic holders and screws, screws of the same length can always be used to bridge different thicknesses of insulating material when fastening covering sheets or plates, but then the length of the tubular extension changes on the plastic holder accordingly. With these different lengths of tubular extensions in the plastic holders, however, there is also the need for different setting options in order to enable the fastening elements to be set correctly. In the case of the tubular extensions of different lengths, the screw heads are arranged more or less deeply recessed in the tubular extensions, so that a drive shaft with a mandrel engaging in the tubular extension must be lowered to different degrees over the lower end of a movable base frame in order to drive it in completely to be able to effect the screw.

From DE 200 07 656 Ul a device of the type mentioned is known, in which the two tube parts can be moved into one another, to the extent that an elongated hole permits. By means of a height adjustment device, by selecting an appropriate hole for the engagement of a knurled screw, it can be preselected how far one of the two pipe parts can be inserted vertically into the other pipe part during the screwing process. It depends on the length of a plastic holder to be attached. During the screwing-in process, the pipe parts can be telescoped into one another. A drill as a screwdriver starts from the same height each time it is screwed on. Only the way that one pipe part travels until an adjusting ring is seated on the stationary other pipe part is adjustable. The height adjustment device is practically only a depth stop in the known device. With the depth stop is fixed, can be moved as far during the screwing of a pipe part with the drive shaft of ^• screwing down. With the height adjustment device can you do not adjust how far the drive shaft looks out of the screw device below. This is disadvantageous in the case of tubular extensions of different lengths because they cannot be held by the mandrel during the screwing-in process. The plastic holder must therefore be brought into the set position by external guide devices.

Devices of the type mentioned are known in particular in connection with a movable underframe (EP 0 600 285 AI). The plastic holder is usually fed through a magazine. The plastic holders with the screws that are usually already inserted are provided in a screw-in position aligned with the screw-in axis and are gripped there by the screwing device. By depressing the screwing device, the entire fastening element is then screwed in by penetrating the screw inserted into the substrate. However, it is always necessary to provide an anti-rotation device for the plastic holder in relation to the screwing device, since they must be inserted in an exactly aligned position in the part to be screwed, so they must not rotate with the screwing device. For this purpose, relatively long guide shafts or guide rails are generally provided in order to secure the plastic holder against twisting until the fastening element is finally set. Height-adjustable, spring-loaded swiveling jaws can also be provided, which go with the setting process in the high position and are left in use until the final setting. These measures require particularly complex design means, and it then becomes particularly difficult to remove a plastic holder that is inclined for any reason from the guide shaft or the guide rails.

With a setting device known from EP 0 535 547 B1, no fastening elements can be screwed in that have a large-area washer with a tubular extension made of plastic. The fastening elements for which the known setting device is provided have a washer or a load distribution plate made of metal. This setting device also has no holding arrangement for the fastening element, which consists of a mandrel which engages in a tubular extension of a plastic holder and is arranged at the free end of the drive shaft. Rather, a fitting projection is provided in this setting device, which at a contact point on the load distribution plate next to one Ramp attacks to fix the load distribution plate. The holding arrangement also serves here as an anti-rotation device.

The present invention has for its object to provide a structurally simple and easy-to-use adjustment device for adapting tubular extensions of different lengths to the plastic holders and an optimal holding arrangement and anti-rotation for the plastic holder.

This object is achieved by a device with the features specified in claim 1.

The measures according to the invention can be achieved in a very simple manner that the mandrel to be inserted into the tubular extension, which is also connected to the screwdriver via a corresponding drive shaft, can engage correspondingly deeply in the tubular extension. It is thus achieved solely by the mutual adjustment of the coaxially guided pipe parts into one another in relation to tubular extensions of different lengths on the plastic holders.

It is provided in a structurally simple manner that a spring-loaded adjustable bolt is arranged on the outer tube part, which engages in a radial bore formed by the inner tube part. This means that not only is simple adjustment possible, but also secure locking and, above all, self-locking locking, which remains securely in this locking position until it is released manually.

It is further proposed that the radial bores on the inner tube part follow one another with an axial grid spacing. This enables a gradual adjustment with an order of magnitude matched to the grid dimensions of the tubular extensions of plastic holders.

It is regarded as a particularly advantageous measure that a depth stop that is effective when used in cooperation with a base frame is assigned to the external pipe part. This measure ensures that the feed movement for the Plastic holder itself is always coordinated in such a way that the large-area washer of the plastic holder comes to rest in a corresponding manner on the surface of a web to be fastened. The possibility has therefore been created that, despite a simple adjustment option for adapting to tubular extensions of different lengths, an adjustment of a depth stop is not also necessary at the same time. The depth stop is therefore always dependent on the final setting of the plastic holder, whereas the simple mutual adjustment of the two coaxially aligned pipe parts can bridge the amount by which the screw head is sunk more or less deeply into a more or less long tubular extension ,

It is provided in a structurally simple manner that the spring-loaded adjustable bolt is held in the depth stop. There is a corresponding accumulation of material here, so that sufficient guidance and thus retention of the spring-loaded adjustable bolt used has also become possible.

In this context, it is also advantageous if the depth stop is designed as a collar encompassing the outer tube part, which receives the spring-loaded adjustable bolt on one side and has a stop lug on the opposite side. Here, too, a solution that is both functionally and structurally very simple can be created, so that the adjustment can be carried out optimally and a correspondingly stable stop lug can also be created.

An optimal protection against rotation is achieved in that the bolt forming the protection against rotation for the plastic holder is provided in a freely projecting manner on a stop surface at the free end of the screwing device and is effective as a stop preventing rotation at the edge area of the large-area washer of the plastic holder.

Due to the dome engaging in the plastic holder, as with the device known from DE 197 54 356 AI, an axially precise alignment is possible, so that it is always ensured that the plastic holder and thus also the screw inserted into the plastic holder, i.e. the complete fastening element, are exactly in the screw-in axis is aligned. Through the bolt or bolts arranged according to the invention on the screwing device moreover, in a structurally simple manner, an exact alignment of the plastic holders around the screw-in axis is ensured, whereby this also creates the possibility that this exact alignment remains effective until the fastening element is finally set. The anti-rotation device for the large-area washer of the plastic holder therefore remains in use until the fastening element is finally set.

Due to this very simple, but particularly effective construction, the guide shafts or guide rails previously required in such arrangements can be omitted along the entire displacement path of the screwing device. It is also in no way necessary to hold the large-area washer of the plastic holder until it is finally seated by means of jaws that can be swung away or spring-loaded that can be pushed back, since this also resulted in a complex and space-intensive construction. The arrangement of one or more cantilevered bolts alone provides a sufficient possibility of providing stops to prevent the plastic holder from rotating.

This design is effective in the same way whether the device is used as a handheld device or is used in a movable base frame. Even when used as a handheld device, the plastic holder is aligned with and around the mandrel and secured against twisting by the bolts acting as stops. This results in the same advantageous results when used in a hand-held device as when used in a movable base frame.

Overall, the device according to the invention creates a device which is significantly improved in terms of design, which is easier to handle and which, above all, allows good access to all important areas. Even if there should ever be any malfunctions in the supply of the fastening elements and in particular the plastic holder, manual intervention is possible without any problems, since no disruptive guides, shafts or cladding are required.

It is further proposed that the bolt or bolts is (are) arranged at an edge of the stop surface, the bolt (s) being attached to a plastic holder is only effective at a longitudinal limit of the plastic holder to prevent rotation. It is therefore only necessary to provide an anti-rotation device so that there is no need to provide appropriate stops or stop areas on opposite longitudinal boundaries of the plastic holders or even circumferentially closed. Such a bolt would in itself be sufficient, but the arrangement of at least two bolts ensures that the plastic holder cannot rotate in either direction about the screw-in axis.

It is further proposed that the length of the freely projecting bolts is approximately equal to the thickness of the large-area washer on the plastic holders in the corresponding stop area. Since the plastic holder is supported on the stop surface formed at the free end of the screwing device, a short length of the bolts is sufficient to provide an effective anti-rotation device for the plastic holder. It is therefore only necessary for these bolts to have a small length in order to provide support at the corresponding point, that is to say in the corresponding stop area on the longitudinal delimitation of the washer.

The device according to the invention is therefore advantageously advantageous both when used as a hand-held device and when used in a movable base frame. In this context, it is advantageous if, in the case of a device inserted into a base frame and an occasional feeding of fastening elements with plastic holders, these are kept ready in a holder with a corresponding orientation, with jaws which can be pivoted away spring-loaded as a support.

Especially when the device is used in a movable base frame, this enables the fastening elements to be provided in a corresponding orientation, the mandrel connected to the drive shaft penetrating into the plastic holder when the screwing device is pressed down, until the plastic holder contacts the stop surface at the free end of the screwing device comes. Since the plastic holders are already held in the appropriate orientation in the holder, these plastic holders can then be gripped by the freely projecting bolts at their longitudinal limit, from which point the screwing device itself takes over the function of the anti-rotation device. If the screwing device continues to move downwards, the jaws, which are designed to be spring-loaded, are pivoted downward, so that the plastic holder and the screwing device can be guided further down through this holder until the fastening element is finally screwed in and set. The bracket is used only for the proper provision of the fasteners, since no additional guide rail or additional guide shaft is then required.

If, in the case of a device according to the invention, a simple possibility is to be created of securely holding the fastening element consisting of the plastic holder and screw in the axial direction until it is finally screwed in, but in doing so making possible a relative rotation between the dome and the plastic holder without any disadvantage for the plastic holder Frictional heat is generated, then a device is proposed in which the mandrel has a body with a threaded bolt for attachment to the free end of a drive shaft and on the body and the threaded bolt a tubular member for attachment to the body at the free end of the drive shaft is attached, which has retaining means in the form of at least one projecting nose which, in cooperation with at least one annularly projecting bead formed in the interior of the tubular extension of a plastic holder, is axially secured provides bracket.

According to the invention, this object is achieved by a device having the features of patent claim 1.

By simply inserting the dome when pressing down the screwing device or when attaching a plastic holder to the screwing device, the plastic holder can be axially secured against the screwing device, this being able to be carried out without any special effort. Even if the bulge formed in the plastic holder and projecting inwards in a ring, which can also be in a multiple arrangement, runs circumferentially closed, an easy insertion is necessary, since only partial areas on the circumference of the dome have to jump over these bulges or bulges. It is therefore not necessary to widen the tubular extension of the plastic holder in the region of the bead or beads, but rather it A short bulge on one side is sufficient, for example, since only the corresponding projecting nose has to be led over the bead or beads.

In this context, EP 0 783 063 AI shows a cylindrical part of a screwdriver. A screwdriver tip is inserted into the cylindrical part. In the plastic holder of a fastener to be set, annular ribs are provided which come into clamping engagement with the cylindrical part of the screwdriver. Thus, the cylindrical part of the screwdriver is also used for axial mounting, but it is assumed that the cylindrical part of the screwdriver and the plastic holder rotate together. Otherwise undesirable frictional heat would arise between the two.

This known device is unsuitable for screwing in fasteners in which the plastic holder should not rotate when screwing in, because the washer is to maintain a certain orientation around the screw-in axis until the fastener is finally set.

In a device according to DE 93 11 122 Ul, the aforementioned problems do not arise anyway, because this is intended for fastening elements that are hammered in.

In order to achieve a proper mounting of the plastic holder on the dome and thus on the screwing device, it is only necessary to keep the plastic holder practically captive, since there are no forces in the direction of removing the plastic holder from the screwing device itself, which are during the setting process or can occur in this direction when screwing in.

Frictional heat cannot arise when the device according to the invention is used, because here there is no friction-locked holder between the plastic holder and the dome, but rather a form-fitting holder that allows mutual relative rotation without further ado.

Another particular advantage of the device according to the invention is that its dome can be attached to any screwing device in order to enable it to be able to place fastening elements of the type in question here. In this context, it is also particularly advantageous if two projecting lugs are formed diametrically opposite one another on the dome. When the dome is inserted into the tubular extension of the plastic holder, the tubular extension is practically elliptically deformed in this area, the tubular extension returning to the original shape after the noses have been completely inserted.

The insertion and proper mounting are further improved in that the projecting lugs have an entry ramp running at an acute angle to the screw-in axis and a stop falling steeply behind. The insertion process is thus made considerably easier even when the plastic holder is inserted by hand, and nevertheless a sufficient safeguard against axial displacement of the plastic holder is ensured.

Embodiments of the invention are explained in more detail in the following description with reference to the drawings. Show it:

Fig. 1 is a side view of a device for screwing prepared prepared

Fasteners, partially shown in section;

FIG. 2 shows a side view of a partial area of the device according to FIG. 1 in the direction of arrow II;

3 shows a section through a screwing device not inserted into a base frame;

4 shows a view of a fastening element that can be used in the device and consists of a plastic holder and a screw;

5 shows a section through a holder for providing a fastening element;

6 shows a plan view of the holder according to FIG. 4.

7 shows an enlarged view of sub-area VII in FIG. 1, partially cut away with the fastening element provided, provided here;

8 shows a side view of the screwing device in the direction of arrow VIII in FIG. 7, partially cut away;

9 shows the fastening element in a side view, partially cut away, a dome connected to a drive shaft being inserted into the plastic holder;

10 shows an enlarged illustration of a section of the dome in section;

Fig.l 1 is a view of this section from below. In the case of a device 1 for screwing in fastening elements 2 which have been prepared in a magazine, there is a base frame 4 which can be moved by means of wheels 3 and in which a screwing device 6 with an integrated screwdriver 5 is held in a vertically displaceable manner. The entire screwing device 6 is inserted in an assembly part 7 and can thus be handled by an operator using handles 8. The mounting part 7 is held displaceably by means of corresponding guide rods, the entire screwing device 6 being automatically moved into the upper rest position by means of a gas spring 9.

The fastening elements 2 are brought into the screw-in position via feed elements 10.

When the screwing device 6 is depressed, a dome 12 provided with an attack 49 for a screw 11 engages in the opening of a plastic holder 13 of the fastening element 2 until the attack 49 engages the screw head. By means of corresponding bolts 14, it is achieved that the plastic holder 13 itself cannot rotate during the depression of the fastening element 2 and during the screwing-in process.

As can be seen from FIG. 4, the device 1 is used to set fastening elements 2 which consist of the plastic holder 13 and the screw 11 which has already been preassembled. Of course, it would also be conceivable to feed the screw 11 only when the plastic holder 13 is occasionally in the screw-in position. In the case of such fastening elements made of plastic holder 13 and screw, however, it is advantageous and also expedient for a quick setting process if the screw is already preassembled in the plastic holder and can also be supplied in this form via an existing magazine 15. A separating arrangement 16 is provided between the magazine 15 and the feed elements 10, which guide the plastic holders 13 in the direction of the screw-in position, which ensures that a fastening element 2 is released and brought into the screw-in position during each setting process, i.e. each time the screwing device 6 is depressed becomes. The separating arrangement 16 has a lever 17 which can be rotated about an axis 19 running transversely to the feed direction of the magazine 15. The screwing device 6, which also receives a continuous drive shaft 64, which is provided at its free end with the dome 12 with the attack 49 and with retaining means 53 in order to bring about a holding of the plastic holder 13 in the axial direction, is designed in a special way. The screw device 6 consists of two coaxially guided tube parts 58 and 59 and corresponding mounting rails 65 and 66. The dimension of the interlocking areas of the two tube parts 58 and 59 can be changed, the tube parts 58, 59 being mutually lockable in the set arrangement. A spring-loaded adjustable bolt 61 is arranged on the outer tube part 58. This pin 61 engages in a radial bore 60 on the inner tube part 59. A plurality of radial bores 60 are provided in succession on the inner tube part 59 with an axial grid spacing, so that a locking between the outer tube part 58 and the inner tube part 59 is made possible at corresponding intervals. The more or less wide sliding of the two tube parts 58 and 59 means that the dome 12 of the drive shaft 64 protrudes more or less far beyond a lower stop surface 52 of the screwing device 6, so that an adaptation to different lengths of the tubular extensions 25 Plastic holder 13 is possible. Depending on the length of these tubular extensions 25, the dome 12 must be able to engage more or less deeply in the tubular extension 25 in order to achieve the required setting depth with a corresponding engagement in the head of the screw 11.

For assembly reasons and also for stiffening the screwing device 6, mounting rails 65 and 66 are arranged at least on two mutually opposite regions of the outer tube part 58, which are firmly connected to the outer tube part 58 by means of screws 67. A recess 68 is also provided, recessed in the mounting rail 65 and screwed into the outer tube part 58, which engages in a longitudinal groove 69 on the inner tube part 59. This ensures that the tube parts 58, 59 cannot be pulled apart completely, and furthermore a mutual anti-rotation device is created.

A stop part 62 which is effective when used in cooperation with a base frame 4 is arranged on the outer pipe part 58. The spring-loaded adjustable bolt 61 is advantageously held in this stop part 62. In the particular embodiment shown, the stop part 62 encompasses the outer tubular part 58 Formed collar, which receives the spring-loaded adjustable bolt 61 on one side and has a stop lug 63 'on the opposite side. When the device 1 is depressed, the stop part 62 with the stop nose 63 'is also moved down together with the screwing device 6 until it comes into contact with a stop screw 63. Then the further advance of the screwing device 6 is prevented. In order to be able to bring about a fine adjustment of the depth stop here, it is possible to unscrew the stop screw 63 further, or to turn it inwards or outwards from a central position, in order to thereby achieve the optimum contact pressure of the large-area washer of the plastic holder 13 on a web to be fastened to effect.

For the proper mounting of the fastening element 2 to be set by the device 1, a holding arrangement 51 is provided, which is formed on the one hand by the dome 12 formed at the free end of a drive shaft 64 and on the other hand by the bolts 14. For exact alignment with the screw-in axis, the dome 12 engages in the interior of the tubular extension 25 of the plastic holder 13. There the dome 12 can then grip the head of the screw 11 via the attack 49. To prevent rotation of the inserted plastic holder 13, two bolts 14 are provided which project freely from a stop surface 52 formed at the free end of the screwing device 6. These bolts 14 are effective on the edge region of a large-area washer 24 of the plastic holder 13 as stops preventing rotation. Two bolts 14 are therefore provided in order to prevent the washer 24 from rotating both in one and in the other direction of rotation.

It would be quite conceivable to provide only one such bolt 14, or to arrange an elongated stop part instead of a bolt. It is therefore only necessary to form stops or a single stop through areas axially projecting over the stop surface 52 in order to prevent the plastic holder 13 from rotating. Such a measure can of course also be effected in connection with a special configuration of the peripheral shape of the large-area washer 24 of the plastic holder 13. For example, such bolts or other stops can be matched to special contours on the peripheral area of the washer or in relation to openings at the edge or in the washer. It would also be conceivable to Provide corresponding bolts 14 or similar stops on the opposite sides for the large-area washer, but it is sufficient for proper mounting to take such measures only on one side. In this context, it would also be conceivable to provide on the stop surface 52 of the screwing device 6 a depression which is adapted to the shape of the large-area washer 24 of the plastic holder 13 and which can therefore accommodate the washer 24 in whole or at least in part, in order in this way to provide a To prevent rotation. It can thus be seen that not only the most effective and simplest construction is possible, but also that structurally complex measures are possible.

The length of the freely cantilevered bolts 14 or correspondingly other designed stops approximately corresponds to the thickness of the large-area washer 24 on the plastic holder 13 in the corresponding stop area. It must therefore be ensured that at least the edge area on a longitudinal boundary of the large-area washer 24 can be properly gripped by the bolts 14.

Especially in connection with the arrangement of the device 1 in a mobile base frame 4, it is also advantageous to provide the fastening elements consisting of plastic holder 13 and preassembled screw 11 accordingly for the screwing-in process. For this purpose, a holder 70 is provided on the base frame 4, which has an insertion region 71 which tapers from top to bottom. An opening 72 adapted to the contour of the large-area washer 24 adjoins this insertion region 71. This opening 72 is closed at two opposite edge areas downwards by jaws 73, 74. Springs 75, 76 are assigned to these jaws 73, 74, so that in the closed position shown in FIG. 4 these jaws 73, 74 are arranged below the opening 72 in their rest position. As soon as a plastic holder 13 is inserted into the holder 70, the screw device 6 can be pressed down. As soon as the dome 13 then penetrates into the tubular extension 25 of the plastic holder 13 and the bolts 14 have detected a longitudinal limitation of the large-area washer 24, the entire screwing device 6 is pressed further down, so that the jaws 73, 74 counter to the force of the springs 75 , 76 can swing down. From this point on, the plastic holder 13 and thus the entire fastening element 2 are held exclusively on the screwing device 6 and therefore no additional is required Guide shafts or guide rails. After the screwing device 6 has been returned after the screwing-in process has ended, the jaws 73, 74 are pivoted back into their starting position by the springs 75, 76, so that the holder 70 is again ready for receiving the next fastening element 2.

With the embodiment shown in FIGS. 9 to 11, the axial retention of the fastening element 2, in particular the plastic holder 13, is to be achieved until the fastening element 2 is finally set. It makes sense not to hinder the screwing-in process for the screw 11 by the axial mounting of the plastic holder 13 or, if necessary, to impair the necessary non-rotatable mounting of the plastic holder 13, and it should also be achieved that the plastic holder 13 is simple and requires little effort , that is to say also by hand, can be applied to the dome 12 in order to then move on this dome 12 into an axially secured position. So there should be no particular friction when rotating the plastic holder 13 on the dome 12.

The plastic holders 13 to be used here have, at a distance from the large-area washer 24 in the area of the tubular extension 25, a circumferentially closed bead 77 which, as it were, brings about a narrowed position in the area of the tubular extension 25. This bead 77, which also advantageously serves as a captive device when the screws 11 are preassembled, namely when the head 50 of the screw can no longer be returned via this bead 77, in the present case becomes the axially secured mounting of the plastic holder 13 on the dome 12 used. There are retention means 53 on the dome 12 or on a separately attachable part 78 of the dome 12, which form a type of holding arrangement 51 for holding the plastic holder 13 in the direction of the screw-in axis. For this purpose, the retaining means 53 are designed in the form of at least one projecting nose 79 which, in cooperation with the ring 77 which projects in the interior in the form of a ring from the tubular extension 25 and which projects inward in an axially secured manner.

Advantageously, there are two projecting lugs 79 diametrically opposite one another on the dome 12 or on the part 78. In order to make it easier to insert the dome 12 and thus the part 78 into the interior of the tubular extension 25, the projecting lugs 79 have an entry ramp 80 which extends at an acute angle to the screw-in axis and a stop 81 which drops steeply behind it. It is thus easy to insert and thus easy to deform the tubular extension 25, which is deformed in the manner of an ellipse when the part 78 penetrates a cross section. As soon as the two mutually opposite lugs 79 have left the area of the bead 77, the tubular extension 25 is returned to its original, circular cross-sectional shape, so that the bead 77 can snap into the part 78 behind the stop 81. As soon as the lugs 79 have overcome this bulge 77, the dome 12 can again be rotated in the tubular extension 25 without any particular hindrance. Therefore, no special effort is required to cause the plastic holder 13 to twist. It is therefore sufficient to arrange the two bolts 14 or corresponding other stops on the lower stop surface 52 of the screwing device 6.

It is entirely possible to construct these lugs 79 in a different way. Such lugs 79 could also be present, for example, each offset by 90 ° to one another. However, it is also conceivable to guide these lugs 79 over certain circumferential areas or to provide a circumferentially closed, nose-like collar. However, it is then less easy to implement. In any case, however, it is necessary to provide corresponding noses or a nose-like collar in order to be able to snap a corresponding bead 77 into place. If only a cylindrical part were to be used, which frictionally engages the tubular extension 25, even if it has one or more beads 77, then there is always a correspondingly large friction between the dome 12 and the inside of the tubular extension 25, but what should be prevented here.

11 that a kind of hexagon head is formed on the upper section of part 78. This makes it possible in a simple manner to screw the part 78 onto the free end of the drive shaft 64, that is to say to fasten it to the drive shaft 64 together with a body 84 which carries the attack 49 and has a threaded bolt 83. 5 and 6 show how the fastening element 2 and in particular the plastic holder 13 is kept ready in a movable base frame 4 when the device 1 is used. Here, a holder 70 is fastened to the base frame 4, which has a tapering insertion area 71 and an adjoining opening 72, which is adapted to the circumferential contour of the large-area washer 24 of the plastic holder 13. As the lower end of this opening 72 there are jaws 73 and 74 which are held in this position by springs 75 and 76. As soon as the dome 12 has penetrated into the interior of the tubular extension 25 of the plastic holder 13 by pressing down the screwing device 6 and there has passed the bead 77, the fastening element 2 has already been properly held axially, with the two bolts 14 then also on one Longitudinal limitation of the large-area washer 24 are used. Upon further pressing down, the two jaws 73 and 74 are then pressed down against the force of the springs 75 and 76, the fastening element 2 then exclusively by the axial mounting between the dome 12 and the tubular extension 25 and the radial mounting by the bearing on the bolts 14 is secured.

The measures according to the invention for axially secured mounting of a plastic holder can be used in a device that is used as a hand-held device, or in an arrangement in which the device is inserted into a movable base frame. In the same way, such a constructive design could be used when inserting plastic holders, that is, in a kind of magazine, but then each time a fastening element was provided, this dome, which was intended exclusively for the magazine, would have to be pulled out again. However, it would also be possible to use such a dome for removing a fastening element from a magazine area, in which case the fastening elements would then have to be led directly to the dome 12 or else the dome 12 itself must be pivoted from a removal position into a screw-in position.

Claims

Subject: Device for screwing in fasteners

1. Device for screwing in fastening elements, which consist of a plastic holder formed from a large washer and a tubular extension and a preassembled screw, a screwing device and a holding arrangement for the fastening element being provided and the screwing device being driven by a screwdriver, and wherein the screwing device Consists of two coaxially guided pipe parts, characterized in that the holding arrangement has a mandrel (12) which can be actuated by the screwing device (6) and which fits into the tubular extension (25) of a plastic holder (13) and an axial holder of the plastic holder (13 ), and that the dimension of the interlocking areas of the two pipe parts (58, 59) can be preset depending on the length of the tubular extension (25) and the pipe parts (58, 59) can be mutually locked in the preset arrangement so that the dome (12 ) protrudes more or less far over a lower stop surface (52) of the screwing device (6).

2. Device according spoke 1, characterized in that a spring-loaded adjustable bolt (61) is arranged on the outer tube part (58, 59), which engages in one of the inner tube part (59) formed radial bores (60).

3. Device according to claim 2, characterized in that the radial bores (60) on the inner tube part (59) follow one another with an axial grid spacing.

4. Device according to one of claims 1 to 3, characterized in that the outer tubular part (58) is associated with an effective when used in cooperation with a base frame (4) depth stop (62).

5. The device according to claim 4, characterized in that the spring-loaded adjustable bolt (61) is held in the depth stop (62).

6. The device according spoke 5, characterized in that the depth stop (62) is designed as a collar surrounding the outer tube part (58), which receives on one side the spring-loaded adjustable bolt (61) and on the opposite side a stop lug ( 63 ').

7. Device according to one of claims 1 to 6, wherein an anti-rotation device is provided for the plastic holder, which is formed by at least one bolt, characterized in that the anti-rotation device for the plastic holder (13) forming bolt (14) on a stop surface ( 52) is provided at the free end of the screwing device (6) and projects freely at the edge area of the large washer (24) of the plastic holder (13) as a stop preventing rotation.

8. The device according to claim 7, characterized in that the bolt or bolts (14) is (are) arranged at an edge of the stop surface (52), the bolt (s) (14) only being attached to a plastic holder (13) a longitudinal limitation of the plastic holder (13) is effective to prevent rotation.

9. The device according to claim 7 or 8, characterized in that the length of the freely projecting bolts (14) is approximately equal to the thickness of the large-area washer (24) on the plastic holder (13) in the corresponding stop area.

10. Device according to one of claims 1 to 9, wherein the holding arrangement (51) for aligning the fastening element (2) is provided in the screw-in axis and is formed on a mandrel (12) engaging in the plastic holder (13), the screwing device ( 6) has a stop which prevents the plastic holder (13) from rotating during the screwing-in process, the dome (12) having a body (84) with a threaded bolt (83) for attachment to the free end of a drive shaft (64) and wherein the Body (84) and the threaded bolt (83) a tubular part (78) for fastening together with the body (84) at the free end of the attachment drive shaft (64) is attached, the retaining means (53) in the form of at least one projecting nose (79), which in cooperation with at least one in the interior of the tubular extension (25) of a plastic holder (13) formed in an annular projecting bead (77) provides an axially secured bracket.

11. The device according spoke 10, characterized in that on the tubular part

(78) of the cathedral (12) two diametrically opposite, projecting lugs

(79) are trained.

12. The device according spoke 10 or 11, characterized in that the projecting lugs (79) have an inlet ramp (80) running at an acute angle to the screw-in axis and a stop falling steeply behind it.