WO1996037344A1

WO1996037344A1 - Device for screwing-in screws together with washers

Info

Publication number: WO1996037344A1
Application number: PCT/EP1996/002003
Authority: WO
Inventors: Daniel Gasser
Original assignee: Sfs Industrie Holding Ag
Priority date: 1995-05-22
Filing date: 1996-05-10
Publication date: 1996-11-28
Also published as: AU5817896A; DE19518778A1; DE19518778C2

Abstract

A device for screwing-in screws (21) together with washers (14) has a slide (11) for positioning the washers (14) in relation to the screwing-in axis (15). A downward open recess (16) is located below the opening (13) in the slide (11). Magnets (18) located at the top (17) of the recess above the plane of the slide (11) retain the washer (14) at its highest position. When the screw (21) is screwed-in and thus pushed downwards through the screwing-in device (4), the washer (14) is released from the magnets (18) and pulled downwards.

Description

Device for screwing in screws with washers

The invention relates to a device for screwing in screws with washers, consisting of a feed arrangement for screws, a slide-in arrangement for washers and a driven screwing device for gripping or engaging the screw head, whereby for feeding washers from a magazine into position in alignment with the screw-in axis is provided with a slide, slide or the like that can be displaced and / or pivoted approximately at right angles to the screw-in axis or to the center axis of the feed arrangement for the screws, and at least in the receiving area of a washer in the area of the screw-in axis or the center axis of the feed arrangement for the screws forming section connects a shaft open towards the bottom.

Devices of the type mentioned have already become known in some design variants. In the case of known devices which provide for the provision of washers in a magazine, corresponding separating devices may be used in cooperation with slides, slides or the like. The feed arrangement for screws can only consist of a feed shaft or a feed tube via which screws are fed individually, or it has also become known to feed belted screws with a corresponding system of levers or grippers.

In some known designs of devices for screwing in screws with washers, the washers fed from a magazine are supported on bars or latching cams which are mechanically lockable or held in their spring position. However, appropriate constructive measures are required for this, as they are filigree parts that often lead to malfunctions in rough construction site operation.

In itself there is also the possibility that the washers fall after being singled out of the magazine and after being fed below the screw-in axis directly onto the surface to be screwed, the screw then being fed in and the screwing being placed. Since the washers used here are generally designed with a funnel-shaped section projecting downwards for the recessed reception of a screw head, one tilts only on this funnel-shaped section supported washer so that the subsequently inserted screw often does not find the hole in the funnel-shaped section. The surrounding area of the funnel-shaped section is then drilled, so that there are faults both in the device itself and in the parts to be screwed.

The present invention has therefore set itself the task of creating a structurally simple solution in a device of the type mentioned at the outset, with which the safe insertion of screws into washers is made possible.

This is achieved according to the invention in that at least one magnet holding the washer in this uppermost position is arranged in the region of the upper shaft end above the level of the displaceable and / or pivotable slide, slide or the like.

On the basis of these measures according to the invention, no pivotable webs, resiliently retractable locking levers or cams are required, since the washer supplied is held in a very effective manner by at least one magnet in a precisely aligned position lying transversely to the screw to be supplied. It is therefore always ensured that the screw is always properly inserted into the washer hole, especially in the case of a funnel-shaped central section in the washer.

So far, the person skilled in the art has obviously refrained from using magnets alone because the magnets could possibly have their effect too early and would thus prevent the washer from being aligned with the screw-in axis in the correct position.

Only in connection with a slide, slide or the like that mechanically displaces and / or pivots the washer is it ensured that the washer is forcibly fed into the correct position below the screw-in axis. Even if the magnet or magnets were already tightening the washer and would or would hold it, the slides, slides or the like used ensure that the displacement movement in the plane of the washer is continued in alignment with the screw-in axis until the correct position is reached . Only after inserting the screw tip and after pressing down and screwing in the screw using the screwing device is the washer pressed down by the force acting in the screwing axis. However, this no longer poses a problem in the screwing-in stage now present, since the most important requirement, namely the safe insertion of the screw tip into the hole in the washer, has already been met.

According to a special embodiment variant, two diametrically opposed magnets are provided with respect to the screw-in axis. This enables an even improved mounting of the supplied washer, even if the device for screwing in screws with washers is subjected to corresponding vibrations.

In the context of the invention, it is particularly advantageous if permanent magnets are used as magnets. This practically ensures a maintenance-free and long-term effective arrangement for holding the supplied washers.

In this context, it is also expedient that the magnets, designed as essentially cylindrical disks, are inserted into corresponding bores in the upper shaft closure and are held in a force-fitting and / or form-fitting manner therein. As a result, commercially available permanent magnets with the required strength can be used in a simple manner. could also be glued in. However, any other non-positive and / or positive mounting is also possible in a simple manner.

In order to improve the proper feeding of the washers aligned with the screw-in axis, it is proposed that an opening be formed in the slide, slide or the like, the limitation of which, at least in sections, is designed to effectively hold washers in their plane, with this opening in the slide, slide or the like in its one end position adjoins the shaft which is open towards the bottom.

The washer is thereby practically always held in its plane within a corresponding opening and must therefore take part in the displacement and / or pivoting movement of the slide, slide or the like, even if the magnet present in the receiving area of the screw-in axis would possibly already act on the washer. The displacement movement and the alignment in the horizontal plane, that is to say in the plane of the washers themselves, thus only causes the slide, slide or the like, whereas the vertical holding of the washers in the screw-in position is carried out exclusively by the magnet or the magnets.

Another advantageous constructive design lies in the fact that above and below the slide, slide or the like in the area between the magazine and the end position aligned with the screw-in connection guideways, at least the lower guideway a continuous cutout for receiving a funnel-shaped formed on the washer Has section for recessed reception of a screw head.

It is thus ensured in the displacement and / or pivoting area of the slide, slide or the like between the magazine and the end position aligned with the screw-in axis that the washers do not move transversely to their plane, i.e. in the vertical direction and thus out of the slide, slide or the like can jump out. The arrangement of the continuous cutout in the lower guideway means that virtually any constructive type of washers - even those with relatively far protruding funnel-shaped sections - can be processed with the device according to the invention.

Further features according to the invention and special advantages are explained in more detail in the following description with reference to the drawings. Show it:

Figure 1 is a schematic oblique view of a device for screwing in screws with washers.

Figure 2 is a plan view of the movable lower part of the device, the structures being largely omitted or shown partially in section;

3 shows a view of the lower part from below, the cover plate being removed; 4 shows a section through the receiving area of a washer in the area of the screw-in axis;

FIG. 5 shows a view of the lower part from below, reduced compared to FIG. 3, but with the cover mounted;

FIG. 6 shows the same representation as FIG. 5, but the slide is shown in the end position pivoted relative to FIG. 3.

The device for screwing in screws with washers essentially consists of a feed arrangement 1 for screws which, according to the illustration in FIG. 1, are held ready from a magazine 2 in a belted form. Furthermore, there is a slide-in arrangement for washers, which will be explained in more detail. The washers are inserted into a magazine 3. At the lower end of this magazine 3, the washers are separated and fed into the receiving area in the area of the screw-in axis by means of a slide, slide or the like. Furthermore, a screw device 4 is provided, which serves to grasp the screw head or to engage it and thus to finally set the screw connection. To hold and guide the screwing device 4 securely, for example, a telescopic rod 5 can be provided, on the free end of which there are corresponding handles 6 for the operator. At the free end of the output shaft 7 of the screw device 4, a tool part 8 adapted to the screws to be inserted is provided. So that the stack of washers can be inserted very easily into the magazine 3, the magazine is practically enclosed by two diametrically opposed angle profiles 9 and 10. Corresponding vertical slots therefore remain between these angle profiles 9 and 10 in order to be able to hold the stack of washers appropriately during insertion. In this way it is also easily possible to use different sizes of washers e.g. can also be used with a square or rectangular shape.

A corresponding slide, slide or the like for feeding the washers can be actuated by a separate mechanism or by a separate electrical or pneumatic drive. A structurally simple and effective measure is given if the separation and the feeding of the washers and, if necessary, the screws as a function of the Feed movement and / or the return stroke movement take place. In this way, various mechanical controls or also electrical switching processes can be triggered, so that corresponding feed movements are activated depending on the extent of the depressed screwing device. However, the measures according to the invention can also be used if screws are introduced individually via a corresponding feed pipe or a feed shaft. It is therefore only necessary to feed the washers from a magazine. The measures according to the invention to be described below can be used both in an arrangement in which the movement of a slide, slide or the like takes place at right angles to the screw-in axis, and in an arrangement in which this movement takes place at an acute angle to the screw-in axis. In the case of the last-mentioned construction variants, the washer which has already been brought into the end position has to be pivoted into the screw-in axis together with a screw which is brought about by a feed arrangement.

In the present invention, a slide 1 1 is now provided, which is pivotable about the axis 12. In the rest position, the slide 1 1 is aligned so that an opening 13 is located directly below the magazine 3, which is formed by the angle profiles 9, 10. Since the magazine shaft is at least partially closed at the bottom by a corresponding guideway 14, the stack of washers can rest on this guideway 14. The lowest washer of the stack lies within the opening 13 in the slide 11. Then when the slide is pivoted into the other end position, the bottom washer is practically pulled out across the stack of washers. The remaining stack of washers remains in the original position, since it is supported on the essentially full-surface part of the pivoting slide 11. Only when the slide 11 has returned to its rest position and the opening 13 reaches below the stack of washers can the next following washer 14 enter the opening 13.

In the receiving area of a washer 14 in the area of the screw-in axis 15, a shaft 16 opens towards the bottom. In the area of the upper shaft end 17 and above the level of the pivotable slide 11, magnets 18 are used which hold the washer 14 in the uppermost position shown in FIG. 4, although no retention functions such as webs, locking cams or the like are present in the shaft 16 underneath are. In the embodiment shown, two are related to the screw-in axis 15 diametrically opposite magnets 18 are provided. With a correspondingly stronger magnet, it would be conceivable to use only one magnet. In principle, it would also be possible to provide an annular magnet which is arranged coaxially with the screw-in axis. The magnets 18 are designed as permanent magnets, which do not require any maintenance even in rough construction site operation. It is therefore also envisaged that such magnets 18 can be used in the form of commercially available parts which are designed as cylindrical disks. The magnets 18 can be inserted into corresponding bores 19 on the upper shaft closure 17 and can be held in these bores 19 in a non-positive and / or positive manner. It would be conceivable, for example, to press the magnets 18 securely and captively from the outset by appropriate shaping on the walls of the bores 19, but screw fastening is also possible. Furthermore, it is quite conceivable to glue the magnets 18 into the corresponding bores 19, since permanent magnets have a correspondingly long service life and, as a rule, replacement need hardly be considered.

Within the scope of the invention it would also be conceivable to use electromagnets instead of permanent magnets, which would then also provide switching options in order to specifically induce the stage of the screwing-in process in which the magnetic force should be present and the stage at which it is exposed.

As already stated, the slide 11 has an opening 13, the boundary 20 of which is designed for at least section-wise, effective mounting of the washers 14 in the plane thereof. At the opening 13 in the slide 1 1 in its end position (FIGS. 4 and 6) adjoins the downwardly open shaft 16. In this end position it is correct

Opening 13 coincides with the cross section of the shaft 16, it being entirely possible that the cross section of the shaft 16 is larger than the opening 13. It is particularly important that the opening 13 or the boundaries 20 of this

Opening causes a forced entrainment and retention of the washer 14 in its horizontal plane. This ensures safe feeding of the

Washer 14 aligned with the screw-in axis 15 possible so that the screw 21 with the screw tip 22 can be securely inserted into the central hole 23 in the washer 14.

The device for screwing in screws with washers is used on flat roofs, where roofing membranes laid over an insulation layer by means of large areas Washers and relatively long screws are to be attached. The emphasis is particularly on large washers, because especially with washers intended for such an application it is necessary that the screw head 24 is properly countersunk in the finished screwed state so that the web to be laid over it is not damaged by the screw head. For this reason, in the case of such washers, a funnel-shaped section 25 is provided, which is used for the recessed reception of the screw head 24. When such funnel-shaped sections 25 are formed, problems arise in feeding the washer 14 from a stacked magazine to the receiving area in the area of the screw-in axis 15. Therefore, it is provided that in the area between the magazine 3 and the end position aligned with the screw-in axis 15, guide tracks 14 and 26 connect, the lower guide track 14 having a continuous cutout 27 which serves to receive the funnel-shaped section 25. Although therefore only the area for receiving the slider 11 and thus the maximum height of the washer in the area of the edge and possibly subsequent ribs or the like remains free between the two guideways 14 and 26, the washer can nevertheless be pivoted in a simple manner because it is flat the funnel-shaped section 25 protrudes further downward. If the washer 14 had projections or elevations projecting upwards, it would of course also be conceivable within the scope of the invention to provide corresponding cutouts on the upper guideway 26 as well.

In the above description, one or two magnets were mentioned. It is quite conceivable to provide more than two such magnets, for example four magnets, particularly in the case of square washers. In the drawings and in the description there is talk of a slide 11 which can be pivoted about the axis 12. The measures according to the invention can of course also be implemented if a corresponding slide is used, through which the washer is moved from the one position below the magazine 3 into the end position in the area of the screw-in axis 15. Various other structural designs of slides are also conceivable, which are not about a twisting or pivoting process, but only about a linear movement.

The process of feeding screws and washers can be done in a variety of ways. So it is conceivable when feeding the screw device 4 in Screw in first the washer and then the screw, whereupon the screwing-in process takes place when the screwing device 4 is further depressed. During the reverse stroke, the individual sliders or grippers are then returned to their rest position. However, it is also possible to bring the washer into the end position during the backward stroke, that is to say when the screwing device 4 moves upward, whereupon only the screw has to be fed in when the screwing device 4 is depressed. The further variant, namely if both the washer and the screw are brought into their end position during the backward stroke of the screwing device 4, is quite conceivable. In this case, the screwing-in process only takes place the next time the screwing device 4 is pressed down. Such or similar procedures are also conceivable if the screws have to be inserted manually through a feed shaft, ie even then the washers can be brought into the position aligned with the screw-in axis 15 either when the screwing device 4 is advanced or when it is returned.

There are still a variety of design changes, but it is always necessary within the scope of the invention that a washer in its plane is forcibly guided to the end position and, in this position, held in its position in the slide, and that Washer is held in this position with respect to its vertical position by inserted magnets 18. Thus, on the one hand, an optimal adjustment of the exact alignment of the washer 14 in the screw-in axis 15 is possible, on the other hand, a secure mounting of the washer 14 without moving and therefore susceptible to failure is present in order to ensure that the screws are securely inserted into the central hole 23 in the washer 14 guarantee.

Claims

claims

1 . Device for screwing in screws with washers, consisting of a feed arrangement for screws, a slide-in arrangement for washers and a driven screwing device for gripping or engaging the screw head, whereby approximately for feeding washers from a magazine into position in alignment with the screw-in axis perpendicular to

Screw-in axis or to the central axis of the feed arrangement for the screws, displaceable and / or pivotable slide, slide or the like is provided, and at least in the section forming the receiving region of a washer in the region of the screw-in axis or the central axis of the feed arrangement for the screws open shaft connects, characterized in that in

Area of the upper shaft end (17) above the plane of the displaceable and / or pivotable slide, slide (11) or the like, at least one magnet (18) holding the washer (14) in this uppermost position is arranged.

2. Device according to claim 1, characterized in that two diametrically opposite magnets (18) are provided with respect to the screw-in axis (15).

3. Apparatus according to claim 1 or 2, characterized in that permanent magnets are used as magnets (18).

4. Device according to claims 1 to 3, characterized in that the magnets (18) are designed as essentially cylindrical disks in corresponding bores (19) at the upper shaft end (17) and are held in this force and / or positively.

5. The device according to claim 1, characterized in that in the carriage, slide (1 1) or the like, an opening (13) is formed, the boundary (20) for at least sections, in the plane effective mounting of washers (14) is executed , with this opening (13) in the slide, slide (11) or the like in one of its end positions adjoining the downwardly open shaft (16).

6. Device according to one of claims 1 to 5, characterized in that above and below the slide, slide (1 1) or the like in the area between the magazine (3) and the end position aligned with the screw-in axis (15) guide tracks (14, 26), at least the lower guideway (14) having a continuous cutout (27) for receiving a funnel-shaped section (25) formed on the washer (14) for the recessed receiving of a screw head (24).