EP1353780B1 - Device for screwing in magazine-fed fastening elements - Google Patents

Abstract

The invention relates to a device for screwing in magazine-fed fastening elements that comprises, inter alia, a plastic retainer ( 13 ). Between the magazine for the plastic retainers ( 13 ) and feeding elements ( 10 ) for feeding the plastic retainers ( 13 ) to the position of screwing, a picking system ( 16 ) is provided. Said picking system ( 16 ) is configured by a lever ( 17 ) that can be swiveled about an axis ( 19 ). An extension ( 26 ) that is formed on the lever arm ( 21 ) and a stop element ( 23 ) that is formed on the lever arm ( 20 ) and that can be pushed back against the force of a spring engage in the feed channel ( 22 ) alternately and sometimes also at the same time.

Description

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

Devices of the type mentioned are already known in various embodiments, z. B. from the EP 0 600 285 A1 , In some of these known devices, the plastic holders are fed in a magazine in such a way that they overlap at their edge regions. Therefore, it is precisely to be tuned to this particular Zuführart to provide separation arrangements, in addition, the risk is given in such a supply that the plastic holder wedge due to the overlaps and the inclination.

In a device specified in the preamble of claim 1 type, from the DE 195 25 328 A1 and EP 06 00 283 is known, no special separation device is provided. Rather, the separation is done by the screwing even in the screwing. The disadvantage that the plastic holders overlap each other is avoided in this device in that a belt is used. This is expensive and should also be avoided. Without belt could not be isolated in this device but.

A device similar to that of the aforementioned type is known from DE 195 38 812 A1 known. In this known device, the plastic holders are supplied in such a way in a magazine that they overlap at their edge regions. Therefore, it is precisely to be tuned to this particular Zuführart to provide separation arrangements, in addition, the risk is given in such a supply that the plastic holder wedged due to the overlaps and the inclination.

In such a device, various design variants for the supply of plastic holders on the magazine can be used. In general, these are appropriate Guide rails or guide bars. It could also two or more such magazines used as rails are arranged side by side parallel to the device, wherein by lateral displacement of these magazines each one of the multiple magazines would be available for removal of the plastic holder.

The present invention has set itself the task of creating an optimal separation arrangement for plastic holders, in their supply the large-surface washers thereof are substantially in a common plane.

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

Thus, an optimal separation possibility for plastic holder has been created so that they can be supplied with their large washers lying practically in a plane and thus the tubular projections are parallel to each other and are aligned substantially perpendicular to the feed. The separation is therefore optimally solved because the bottom plastic holder is prevented by the lever arm engaging there at the further feed. As soon as a further plastic holder is to be tracked, yes, the lever must be pivoted accordingly, so that the bottom plastic holder can slide into the screwed position. This ensures in a simple and effective way that the next following plastic holder can not fall immediately, i. only then moves further, when the rotatable lever is returned to its rest position, is pressed in a simple manner with the spring-loaded rückdrückbaren stop member on the surface of the large washer of the plastic holder and thus this and will all the following plastic holder of the magazine at another Moving prevented. After the pivoting back of the lever arm in its rest position of a lever arm is then back in the engaging in the feed channel position and thus forms for the bottom of the now slipping plastic holder a corresponding stop.

An advantageous embodiment provides that the spring-loaded rückdrückbare stop part of a lever arm is designed as a spring-loaded in its rest position ausschiebbarer bolt. It can thereby already at a slight twisting of the lever, a contact pressure be exerted on the back of the plastic holder, with this contact force correspondingly amplified during the further pivoting operation of the lever. It is thus always ensured that the entire magazine plastic holder, with the exception of the very bottom plastic holder are held in a locked position until the lever is returned to its rest position and thus the engaging in the feed passage extension blocks the further feed.

A further embodiment of the invention provides that the stop member lies with its free end directed towards the feed channel in its extended rest position until immediately before engagement in the feed channel, so that even a slight turning operation of the lever this stop member engages already in the feed channel , It is thereby ensured that the plastic holder with the exception of just released bottom plastic holder both the Rückschwenkvorgang - ie to release the bottom plastic holder - as well as the rotation of the lever in the rest position - ie after the bottom plastic holder has left the magazine area - by the engaging spring-loaded Stop member are secured in a holding position. Only when the lever is fully guided in its rest position, so if the locking projection fully engages in the feed, also the spring-loaded rückdrückbare stop member, which is designed here as a bolt, so that now all are still in the magazine Plastic holder can slide around this one station down.

In this context, it is advantageous that the distance between the fixed projection and the spring-loaded push out stop member is greater than the width of the large washer of the plastic holder measured in the feed direction of the feed channel, so that at the beginning of the rotational movement of the lever and as long as the extension on the other lever arm releases the passage in the feed channel, presses the stopper member on the surface of the next following plastic holder. By these measures an optimal vote of the separation arrangement on the plastic holder used is possible, so that a trouble-free supply and separation is ensured even in rough construction site operation.

If in a further embodiment of the invention, the stop member is rounded at its free end and / or executed chamfered, this is always a correspondingly clean and edge-free pressure range given so that it can not lead to surface damage in the plastic holders.

It is further provided that the lever is spring-loaded held in its rest position, in which the extension engages the rear in the feed direction lever arm in the feed channel. It is then just from a rest position, the speech when the stop member is relieved and thus no contact force is exerted on the plastic holder. The extension of the lower lever arm has in this rest position only the task to keep all in the magazine overlying plastic holder in this rest position until the next separation is pending.

A further structural embodiment provides that the lever has on a side remote from the extension and the stop member side an engagement surface for applying a displaceable with the advancement of the device actuating element. It is characterized in a simple manner depending on the successive setting operations a separation of the plastic holder and advantageously already provided with preassembled screws plastic holder possible. In each setting process, so if a magaziniert prepared fastener is screwed, takes place when returning the device in the starting position, the supply of another fastener consisting of plastic holder and screw, in mutual coordination of the movements optimal separation and feeding can be achieved.

So that an effective and fast rotation of the lever of the separating arrangement is possible and thus the pressing of the stop member and the release of the bottom plastic holder can be optimally matched, it makes sense if the attack surface of the lever and an attack surface of the actuating element in the respective rest position parallel to each other having aligned inclined surfaces which impinge upon displacement relative to each other directly to each other. By the two mutually contacting inclined surfaces a rapid rotation of the lever is triggered on a short range of motion of the setting device and thus an immediate release of the bottom plastic holder and a direct holding the bottom plastic holder of the overlying, located in the magazine plastic holder.

Especially with such a structural design of a separating arrangement, it is advantageous if a magazine for pre-storage of plastic holders can be attached to this. It is also possible to provide a removable magazine, which is directly attachable to the mounted singulation arrangement. It is also possible in such a case that the feed to screw-in position only serve as a support, as on this short leading to the screw path way no change in position of the plastic holder is more possible, especially when just such a plastic holder pre-assembled with a screw is, by the deep in the extension of the plastic holder lying center of gravity of the entire fastener a position assurance is ensured.

An optimal way to magazinierten hold the plastic holder, with a simple insertion of the plastic holder and a trouble-free removal should be possible, is given if the supply channel is limited by a guide bar and by means of guide rails in the interior of the profile, the guide rails spaced from each other on both sides the open area are arranged.

With such a magazine, the large-area washers of the plastic holder can be accommodated practically aligned in a plane to each other, so that they rest with their edge regions together. It can therefore not come to a wedging of the individual plastic holder. Of course, the plastic holders are received with appropriate play, but with the arrangement of guide web or guide rails a support of the large-area washer is given only to partial areas. There are no friction losses when moving the plastic holders in this magazine, because the plastic holders do not come in contact with the magazine over a large area. On the guide rails between plastic holder and magazine only line contact. At the guide bar, which is located in the feed channel in the middle, there is also only small-surface touch, because there the plastic holder are provided in the middle above with a large hole, which leads into the tubular extension.

A particularly advantageous embodiment is that the profile forming the magazine is insertable and lockable mounted on this. So it's possible two or more Such magazines to make available that can be constantly refilled, so that in turn by simply replacing a magazine in turn, a corresponding number of plastic holders for further processing in the device is available. For filling a magazine so not the device itself must be available, but it can be carried out during this time with the device settlements with the prepared fasteners, during which time another person equipped the magazines ready again with plastic holders and possibly pre-assembled screws can be.

In this context, it is particularly advantageous that recesses or elevations are formed on the guide web or on the guide rails, which are designed to correspond to elevations or depressions on the device. Therefore, the magazine can be easily attached by inserting, so that the proper alignment of the magazine is already ensured to the device and rotation of the magazine about its axis is prevented. The easiest way to do this between journal and device a pin-hole connection is provided, which allows a quick attachment in the manner of engagement, thereby to specify both in the axial direction of the magazine and in the corresponding angular position exact alignment.

In connection with the connection between the magazine and the device provides an advantageous measure that for securing the position and non-positive locking between the magazine and the device on the back of the magazine, a fastening tab for attack and non-positive locking is provided on the device. Thus, if the magazine with its lower end is form-fittingly attached to the device, it still requires an additional support to keep the nevertheless a certain length having magazine in exact alignment with the device. It is therefore given a very simple constructive variant, if a corresponding training for positive locking with distance from the free end of the magazine is present here.

In this connection, an advantageous measure provides that the magazine has closure elements for captive retention of inserted plastic holders at its two end regions. So it can be closed or opened in a sense, the two end portions of the magazine. When filling the magazine, for example brought the underlying end portion associated closure element in the locked position, so that the imported plastic holder can not get on the lower side of the magazine back out. The closure element associated with the upper end region of the magazine can be brought into the closed position after the complete filling of a magazine so that the plastic holders can not fall outward on this side when handling and if necessary incorrect handling of the magazine. Since the closure elements are preferably arranged on the open side of the C-shaped profile and thus engage in the range of movement of the tubular extensions of the plastic holder to be used, no complicated arrangement of guides for inserting the closure elements just in the region of the relatively narrow feed channel is required, but the closure elements can be arranged on the outer surface of the magazine forming the C-shaped profile. The closure elements are thus displaced in the region outside the open region of the C-shaped profile, so that practically the projecting tubular extensions of the plastic holders are prevented from further displacement in the direction towards the end regions of the magazine. Through these measures, it is also possible in a simple manner to make the magazine ready for use, namely that after mounting the magazine on the device in a simple manner, the corresponding closure element can be withdrawn into the open position.

In an advantageous construction it is provided that the closure elements can be moved transversely to the longitudinal extent of the profile displaceable in the locking and in the open position. It is therefore also a very easy operation option ensures that is trouble-free even in rough construction site operation.

Precisely because of these measures, it is particularly advantageous if the magazine can be connected directly to a separating arrangement formed or arranged on the device. As a result, only small sections between the magazine and the separating arrangement are to be bridged so that the supply of the plastic holders can take place without problems.

For the supply of the plastic holder and the forwarding of the same up to the screw-in position, it is advantageous if the magazine formed by a straight running profile is, wherein the magazine in the mounted on the device position with the screwing forms an acute angle. The use of a rectilinear profile not only the transport of some such magazines is easy, but it is also a flawless and trouble-free displacement of the plastic holder in such a magazine possible. If the attachment of the magazine takes place at an acute angle to the screwing of the device, it requires a much smaller change in the position of the plastic holder to bring them into the screwing, and it is therefore a deflection of the feed direction in the magazine to screw-in with essential lower angle changes possible.

• Fig. 1 eine Seitenansicht einer Vorrichtung zum Einschrauben von magaziniert vorbereiteten Befestigungselementen, teilweise im Schnitt dargestellt;
• Fig. 2 eine Seitenansicht eines Teilbereiches der Vorrichtung nach Fig. 1 in Pfeilrichtung II gesehen;
• Fig. 3 eine Ansicht eines in der Vorrichtung einsetzbaren, aus einem Kunststoffhalter und einer Schraube bestehenden Befestigungselementes;
• Fig. 4 eine vergrößerte Darstellung einer Vereinzelungsanordnung für über ein Magazin zugeführte Befestigungselemente;
• Fig. 5 einen Vertikalschnitt durch die Vereinzelunganordnung nach Fig. 4;
• Fig. 6 die Vereinzelungsanordnung in einer Ansicht in Pfeilrichtung VI in Fig. 5;
• Fig. 7 eine Frontansicht des Magazins;
• Fig. 8 eine Stirnansicht des Magazins in Pfeilrichtung VI in Fig. 7;
• Fig. 9 eine Ansicht und einen Schnitt nach der Linie VII-VII in Fig. 7;
• Fig. 10 eine Seitenansicht des Magazins, teilweise aufgeschnitten dargestellt.

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

• Fig. 1 a side view of an apparatus for screwing magaziniert prepared fasteners, partially in section;
• Fig. 2 a side view of a portion of the device according to Fig. 1 seen in the direction of arrow II;
• Fig. 3 a view of an insertable in the device, consisting of a plastic holder and a screw fastener;
• Fig. 4 an enlarged view of a separating arrangement for about a magazine supplied fasteners;
• Fig. 5 a vertical section through the singulation after Fig. 4 ;
• Fig. 6 the separating arrangement in a view in the direction of arrow VI in Fig. 5 ;
• Fig. 7 a front view of the magazine;
• Fig. 8 an end view of the magazine in the direction of arrow VI in Fig. 7 ;
• Fig. 9 a view and a section along the line VII-VII in Fig. 7 ;
• Fig. 10 a side view of the magazine, shown partially cut.

In a device 1 for screwing in cartridges prepared Befestigungselmenten 2 a movable by means of wheels 3 base frame 4 is provided, in which a screwing device 6 is slidably held with an integrated screwdriver 5 in the vertical direction. The entire screwing device 6 is inserted in a mounting part 7 and thus to be handled by handles 8 by an operator. About corresponding guide rods of the mounting part 7 is displaceable Guide rods, the mounting member 7 is slidably held, wherein by means of a gas spring 9, the entire screwing is moved in each case by itself in the upper rest position.

About feed elements 10, the fasteners 2 are brought into the screwed.

When depressing the screw 6 then engages a provided with an attack for a screw 11 dome 12 so far into the opening of a plastic holder 13 of the fastener 2 until the attack is detected by the screw head. By means of corresponding bolts 14 it is achieved that during the depression of the fastening element 2 and during the screwing-in process itself, the plastic holder 13 can not rotate.

How out Figure 3 it can be seen, 1 fastening elements 2 are set with such a device, which consist of the plastic holder 13 and an already pre-assembled screw 11. Of course, it would also be conceivable to supply the screw 11 only when the plastic holder 13 is isolated in the screwed-in position. Especially with such fasteners plastic holder and screw, it is advantageous and also useful for a quick setting process when the screw 11 is already pre-assembled in the plastic holder 13 and can be fed via an existing magazine 15 in this form. Between the magazine 15 and the feed elements 10, which guide the plastic holder 13 in the direction screw position, a separating arrangement 16 is provided, which ensures that each set operation, ie each time the screwing device 6 is depressed, a fastener 2 released and placed in the screwing becomes. The separating arrangement 16 has a lever 17, which is rotatable about an axis 19 extending transversely to the feed direction 18 of the magazine. The end portions of both arms 20, 21 of the lever 17 engage alternately and in sections simultaneously in the feed channel 22 for the plastic holder 13 a. The first in the feed direction 18 of the plastic holder 13 lever arm has at its free end portion on a spring-loaded rückdrückbaren stop member 23. The separating arrangement 16 is used particularly advantageously in fastening elements which have plastic holders 13, which consist of a large-area washer 24 and a tubular extension 25.

As well as from the in Fig. 5 shown plastic holders 13 can be seen, they are supplied in the magazine 15 so that the large washers 24 thereof are arranged lying practically in a plane successive, so that then the tubular projections 25 are aligned substantially perpendicular to the guide track 22 of the magazine 15.

In the separating arrangement 16 of the rear in the feed direction 18 of the plastic holder 13 lever arm 21 is provided with an extension 26 which locks the feed channel 22 for the magaziniert supplied plastic holder 13 in the spring-loaded rest position of the lever 17.

The spring-loaded push-back stop member 23 is executed in the embodiment shown as spring loaded in its rest position ausschiebbarer bolt. It is therefore also conceivable that seen on the width of the lever 17, for example, two bolts are arranged side by side, which then together form the stop member 23. In a bolt and the holder and the required spring load are easy to perform, and also in a simple manner, for example, a slot 27 and a screw 28, a movement limit in the displacement range of such a bolt is possible, which is to form the stop member 23.

As well as out Fig. 5 it can be seen, the stop member 23 is located with its free, the feed channel 22 directed end in its extended rest position until just before the intervention in the feed channel 22. In the rest position thus no obstruction of the plastic holder 13 takes place on a Continuing in the feed 22. It is However, even with a slight turning operation of the lever 17 already ensures that the stop member 23 moves in the direction of feed channel 22 and thus would engage in the feed channel 22, if not directly in this area a plastic holder 13 would lie with the large washer 24.

When pivoting the lever 17 is thus released by retracting the extension 26 of the feed channel 22, so that the bottom plastic holder 13 on the feed 10 can slide down into the screwed position. As soon as a rotational movement of the lever 17 results, the stop member 23 is directly on the surface 29 of the next plastic holder 13 and pushes it to the opposite wall of the Zuführkanales 22. So it will be this plastic holder 13 and all other overlying located in the magazine plastic holder prevented further downward slipping, so that the released through the extension 26 passage opening of the feed channel 22 can remain open without problems until the following setting process is completed and thus the lever 17 can be returned to its rest position.

The special structural design of the stop member 23 can be done in various ways. It is also advantageous if the stop member 23 is rounded at its free end and / or executed chamfered. It would also be conceivable to manufacture this stop member, for example, from plastic or as a corresponding rail, which can be supported on the surface 29 of the plastic holder 13 over a relatively wide section.

The lever 17 is spring-loaded held in its rest position, wherein this can be done in a simple manner via a coil spring 30. In the rest position thus always engages the extension 26 of the other lever arm 21 in the feed channel 22 a.

In particular from Fig. 2 and with respect to the separation arrangement also from the Fig. 4 and 5 It can be seen that the lever 17 on the side facing away from the extension 26 and from the stop member 23 has an engagement surface 31 for applying a displaceable with the advancement of the device 1 actuating element 32. The engagement surface 31 of the lever 17 and an engagement surface 33 of the actuating element 32 have in the respective rest position parallel to each other inclined surfaces, which upon displacement of the screw 6 and thus at a relatively successful sliding action directly on each other, which by these attack surfaces 31 and 33 a relatively fast switching operation for the lever 17 takes place.

As can be seen from the drawings, the separating arrangement in the embodiment shown is immediately adjacent to the attachable magazine 15 for pre-storage of plastic holders 13 and thus immediately before the adjoining feed elements 10, which bring the plastic holder 13 in the screwed position, arranged. This seems to be the simplest and fastest and most effective constructive design in the construction shown. Of course, it would also be conceivable to provide the separating arrangement 16 at another location of the device 1 or, for example, to arrange it in the immediate area of the magazine 15. However, the particular position of the separating arrangement 16 in the particular location is also advantageous insofar as it makes the magazine 15 itself structurally simple, so that it is also possible in principle to provide multiply filled magazines, which can then be easily attached in order in order to be able to separate the pre-assembled fastening elements 2.

The distance between the extension 26 and the stop member 23 is selected so that upon an adjusting movement of the lever 17, the stop member 23 comes with a corresponding spring load already in the inwardly curved portion of the plastic holder 13 to the plant, so that the second existing plastic holder 13th endeavoring to push towards the extension 26. If then the extension 26 comes out of the feed channel 22, so if the bottom plastic holder 13 is released, then it comes by the spring load of the stop member 23 to a jerky further movement of the next plastic holder 13, namely because the stop member 23 suddenly in the center region of the next plastic holder 13 can push. The bottom plastic holder 13 thus experiences almost a shock or at least a shock movement, thereby additionally causing a safe ejection of the shared plastic holder 13. When swinging back the lever 17 then the extension 26 enters a locking position in the feed channel 22 before the stop member 23 releases the now lowest plastic holder 13.

In the in the Fig. 7 to 10 The magazine 15 is used to positionally support and slidably receiving the plastic holder 13, wherein as an essential criterion is that the large-area washers 24 of the plastic holder 13 practically in one plane lying consecutively held in the magazine 15 and do not overlap each other. It also results in a significant flatter construction of the magazine 15 itself and it is also the separation of the plastic holder 13 during removal from the magazine 15 has become easier.

The magazine 15 is formed substantially as a C-shaped profile 34, so that an open area 35 remains free in the manner of a slot, which serves for the passage of extensions 25 of the plastic holder 13. In the inner region of the profile 34, a guide web 36 is provided, which is essentially formed by a reinforced embodiment of the rear wall of the profile 34. Further, 34 guide rails 37 and 38 are formed or arranged in this profile, so that here two spaced apart on both sides of the open area 35 arranged guides for the plastic holder 13 used are formed.

By virtue of the guide web 36 and the guide rails 37 and 38, a feed channel 22 for guided reception of the large-area washers 24 of the plastic holders 13 is created, which substantially corresponds to the thickness of the washers 24. Outside, namely the side of the guide bar 36 and the guide rails 37 and 38 there is sufficient space, so that only a very small contact area between the magazine 15 and the plastic holders 13 used is present. It is thereby ensured a very simple and trouble-free retraction of the plastic holder 13 in the continuous removal.

As in particular the Fig. 7 to 10 can be removed, the magazine 15 at its two end portions closure elements 39 and 40, thereby causing a captive mounting of the plastic holder 13 used can. The closure elements 39 and 40 can be advantageously used, for example, in the magazine phase and during the storage of magazines 15 already equipped with plastic holders 13. It is then ensured that the magazine-mounted plastic holder 13 does not leave the magazine 15. Even when applying the magazine 15 to the device 1 itself, this results in no problems because the closure element can be pulled after attaching the magazine 15 to the device 1 in the open position.

This is possible because the closure elements 39, 40 can be brought transversely to the longitudinal extent of the profile 34 in the locked and in the open position. An advantageous construction looks like this as well from the Fig. 7 to 10 it is apparent to arrange the closure elements 39, 40 on the open side of the C-shaped profile 34, so that the closure elements 39, 40 engage with corresponding bars 41 in the range of movement of the tubular extensions 25 of the plastic holder 13 to be used.

A particularly advantageous construction of the magazine 15 provides that the free lower end of the magazine 15 can be attached to the device 1 in a form-fitting manner and can be locked non-positively with respect to it. It is thus possible in a simple manner to equip the magazine 15 outside the device 1 with corresponding plastic holders 13 and, if necessary, quickly and easily attach to the device 1. In the example shown, a kind of pin-hole connection is provided between the magazine 15 and the device 1. In this case, in the guide rails 37, 38 at the free lower end of the same holes 42, 43 are provided, which are formed corresponding to bolts 44 which are formed on the device 1 or advantageously arranged on a device 1 separating arrangement 16. The magazine 15 therefore only has to be attached to the device 1 in the feed direction 18 and, in the special case, to the separating arrangement 16 so that the bolts 44 engage in the bores 42, 43. It is thus already a position assurance and rotation of the magazine 15 with respect to the device 1 guaranteed. To then properly hold the magazine 15 in this position used, an additional positive locking with the device 1 is required. This can be done in a simple manner via a arranged on the back of the magazine 15 mounting strap 45. About this fastening tab 45 is connected to a support arm 46, which is arranged on the stationary base frame 4 of the device 1. The locking itself is done by a plug-in pin, which is designed, for example, spring loaded.

There are various ways to make a mutual positive connection between the magazine 15 and the device 1. Instead of a pin-hole connection, any type of depressions or elevations may be provided at the free end of the magazine 15 and correspondingly corresponding elevations and depressions on the device 1. It is also possible to form these elevations, depressions, holes or pins not only on the guide web or on the guide rails, but also on the profile itself. It would therefore also be conceivable in principle, a partial area form the profile 34 above, in which case a corresponding opening for insertion of the projecting portion of the profile 34 would be formed on the device 1. Also, for the upper support of the magazine 15, a kind of resilient holding jaws 45 could be provided instead of the fastening tab, so that the magazine 15 would bring only with its lower end in positive engagement with the device 1 and then pressed with a slight Verschränkbewegung in a resilient support would have to be. So here are the most diverse variants open.

As can be seen from the drawings, the magazine 15 is formed by a rectilinear profile 34. It would be within the scope of the invention also conceivable to provide this profile 34 with a corresponding curvature, but the handling, the simple and safe feeding of the plastic holder and also the arrangement on the device itself are easier and better to make if a straight-line profile 34 is present. It is also advantageous that the magazine 15 encloses an acute angle W in the position mounted on the device 1 with the screwing-in direction. Thus, not only the handling and arrangement of the magazine 15 is very easy, but it is also easier to feed the plastic holder 13 used, since a smaller angle change is required until the final screwing.

The inventive measures not only the possibility has been created to provide a structurally simple design, but it can now multiple-filled magazines are provided, which can then be easily attached to the device 1 in turn in a very simple manner and above all quickly.

As in particular from the Fig. 2 and 4 It can be seen, an additional feed pressure for the plastic holder 13 inserted into the magazine 15 can be achieved when a likewise inserted into the magazine 15 sliding body 47 is used as a weight. This slider 47 can be secured captively, for example via a chain 48 on the support arm 46.

Claims (18)

1. An apparatus for screwing in fastening elements provided in a magazine, which comprise a plastics holder, formed from a large-area washer and a tubular extension, and an optionally already preassembled screw, wherein a feed limiting assembly is provided between the magazine for the plastics holders and the feed elements to the screwing-in location, wherein the feed limiting assembly has a double-armed lever which can rotate about an axis extending transversely to the feed direction of the magazine, and wherein the lever arm situated to the rear in the feed direction of the plastics holders has a fixed extension which in the rest position of the lever blocks the feed channel for the plastics holders fed in a magazine, characterised in that the lever arm (20) coming first in the feed direction (18) of the plastics holders (13) has in its free end zone a spring-loaded retractable stop member (23) which engages in the feed channel (22) for the plastics holders (13) when the extension (26) of the lever arm (21) situated to the rear is moved out of its blocking rest position.
2. An apparatus according to Claim 1, characterised in that the spring-loaded retractable stop member (23) of one lever arm (20) in the form of a pin which can be extended spring-loaded into its rest position.
3. An apparatus according to Claim 1 or 2, characterised in that, with its free end which is directed towards the feed channel, the stop member (23) is situated in its extended rest position as far as immediately in front of the engagement in the feed channel (22), so that even with only a slight rotating operation of the lever (17) this stop member (23) already engages in the feed channel.
4. An apparatus according to any one of Claims 1 to 3, characterised in that the distance between the fixed extension (26) and the spring-loaded extendable stop member (23) is greater than the width of the large-area washer (24) of the plastics holder (13) in the feed direction (18) of the feed channel (22), so that at the start of the rotating movement of the lever (17) and as long as the extension (26) on the other lever arm (21) frees the passage in the feed channel (22) the stop member (23) presses on to the surface (29) of the succeeding plastics holder (13).
5. An apparatus according to any one of Claims 1 to 4, characterised in that the stop member (23) is rounded and/or bevelled at its free end.
6. An apparatus according to any one of Claims 1 to 5, characterised in that the lever (17) is retained spring-loaded in its rest position, in which the extension (26) on the lever arm situated to the rear in feed direction engages in the feed channel (22).
7. An apparatus according to any one of Claims 1 to 6, characterised in that the lever (17) has on one side remote from the extension (26) and the stop member (23) an engagement surface (31) for attaching an actuating element (32) which can be displaced with the advance of the apparatus (1).
8. An apparatus according to Claim 7, characterised in that the engagement surface (31) of the lever (17) and an engagement surface (33) of the actuating element (32) have inclined surfaces which are aligned parallel to one another in the respective rest position and which directly encounter one another when displaced relative to one another.
9. An apparatus according to any one of Claims 1 to 8, characterised in that a magazine (15) for the preloading of plastics holders (13) can be attached to the feed limiting assembly (16).
10. An apparatus according to any one of Claims 1 to 9, in which plastics holders formed from a large-area washer and a tubular extension, and an optionally already preassembled screw, wherein a magazine for the correctly positioned mounting and displaceable accommodation of the plastics holders with the tubular extensions is provided, wherein the magazine is in the form of a C-shaped profile, in which the open zone is designed for the passage of the extensions of the plastics holders, and wherein in the inner zone of the profile there is formed a feed channel which corresponds to the thickness of the washers of the plastics holders to be accommodated and which serves for the guided accommodation of the large-area washers of the plastics holders, characterised in that in the inner zone of the profile (34) the feed channel (22) is bounded by means of a guide web (36) and by means of guide rails (37,38), wherein the guide rails (37,38) are arranged spaced apart on either side of the open zone (36).
11. An apparatus according to Claim 10, characterised in that the guide web (36) is formed by a reinforced configuration of the rear wall of the profile (34).
12. An apparatus according to Claim 10 or 11, characterised in that the profile (34) forming the magazine (15) can be mounted on the apparatus (1) in a manner enabling it to be inserted and locked therein.
13. An apparatus according to Claim 3, characterised in that recesses or raised portions are formed on the guide web (36) or on the guide rails (37,38), which are designed to correspond with raised portions or recesses on the apparatus (1).
14. An apparatus according to Claim 12 or 13, characterised in that for location and frictional locking between the magazine (15) and the apparatus (1) a fastening clip (45) is provided on the rear side of the magazine (15) for engagement and for positive locking on the apparatus (1).
15. An apparatus according to any one of Claims 10 to 14, characterised in that in both its end zones the magazine (15) has closure elements (39,40) for holding captive the inserted plastics holders (13).
16. An apparatus according to Claim 15, characterised in that the closure elements (39,40) can be displaced into a closed position and into an open position transversely to the longitudinal extent of the profile (34).
17. An apparatus according to any one of Claims 10 to 16, characterised in that the magazine (15) can be attached directly to a feed limiting assembly (16) formed or mounted on the apparatus (1).
18. An apparatus according to any one of Claims 10 to 17, characterised in that the magazine (15) is formed by a straight profile (34), wherein in its position mounted on the apparatus (1) the magazine (15) forms an acute angle (W) with the screwing-in direction.

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