DE3844113A1 - Fastening element - Google Patents

Abstract

In the case of a fastening element having a screw-connectable body comprising preferably a threaded shank (3) and head (4), for example a wood screw, preferably a chipboard screw, at least the threaded shank (3) of the body (1) is intended to be sheathed at least partially by a flexible material (2) and/or a dowel body (5). In this arrangement, the dowel body (5) is intended to be divided into two parts, and it comprises a sleeve (27) which follows on from the screw head (13) and against which a dowel (26) butts, said dowel exhibiting the dowel foot (8). The dowel foot (8) is penetrated by the threaded spindle of the screw (1). <IMAGE>

Description

The invention relates to a fastener a screwable body, preferably one Threaded shaft and head, for example one Wood screw, preferably chipboard screw.

It is known that od. The like. In boreholes of walls or similar supports elements dowels used. Here, an ent speaking borehole created in the masonry, then the dowel is inserted into this borehole and the Screwed in. Spread the dowel wedging the screw in the borehole. These dowels are available in various forms on the market. In in any case, they become completely independent of that actual fastener, especially the Screw, offered. This has disadvantages since the buyer the right one for a selected screw Dowels, especially with regard to their diameter, must search.  

Another disadvantage of the dowels is that in many cases the dowel consists of two halves, in particular when expanding the borehole the screw when screwing in from these two Halves runs out and thus by no means a spread the dowel halves takes place. The need suffers fixing the screw considerably.

The inventor set himself the goal of a fastener to develop a supply element of the type mentioned above, which is rational and cheaper to manufacture as well offers a more rational processing option, opens up a wide range of applications and one experienced safe fixation.

To solve this problem leads that at least the Ge wind shaft at least partially with an elastic Material or a dowel body is covered.

I.e. the fastener is said to be on the market already as covered by an elastic material Screw are offered. The buyer doesn't need to buy more separately screw and dowel, but he receives a screw which he like a dowel can use. For this, as is also usual before, made a borehole, which is slightly larger than the diameter of the screw. In this drill hole the inserted screw is inserted at hammered in higher resistance. There the elastic material casing from the borehole itself or the borehole walls is held at Tightening the screw will cause a material jam Spreading pressure due to mass displacement leads. A The screw falls out of the elastic material can not take place.  

An important focus is on the size of the borehole judge, since it must be chosen so that the fastening tion element can be used tightly so that the elastic material is not when tightening the Screw turns. Here, however, an elastic Find material application where a minor Material removal possible if the borehole diameter is too small is.

The preferred screw is a chipboard screw, such as those sold under the name "Spax" is available to be used. This has the Advantage that their threaded shaft is relatively small Diameter in relation to the diameter of the Has threads so that these threads can accumulate much more elastic material than with other known screws. This will make the Bale pressures increased.

It is especially thought of this fastener supply element for the chipboard screw connection use and here especially if a screwing in and out of the screw more frequently the same borehole is to take place or is already taking place has found. Here it is possible, for example this fastener into the corresponding Glue borehole so that a frequently used Thread is achieved.

In addition to improving the mounting of the screw by preventing the screw from running out the elastic material the accuracy of fit Screw significantly increased what application for it cases where fit is important, particularly useful.  

It is obvious that both manufacturing this fastener as well as the processing more rational and cheaper than known ones Fasteners is.

Preferably, the entire screw, i. H. both the Threaded shaft as well as the head of the elastic Be material covered. The elastic serves Material on the head especially the support of the head opposite the support element, such as wall work or chipboard.

The ways in which the elastic material can be applied to the screw diverse. For example, it is thought of a Foil to put the screw and open this foil shrink. The screw can also be in a foil tube inserted and then this foil tube be shrunk onto the screw. There is also a sure rational option in it, the screw immerse in a bath made of elastic material. Also application via vacuum appears possible. Here is supposed to however, there is no limit to the idea of the invention be.

In another embodiment of the invention the threaded shaft is not directly from the elastic Material occupied, but from a dowel body dresses. This anchor body has a longitudinal bore whose diameter is equal to or larger than the diameter of a shaft core of the screwable Body. If the diameter of the longitudinal bore is consistently correspond to that of the shaft core, so is by the screwable body either in the Longitudinal bore creates an internal thread, d. H. turned on cut, or this longitudinal hole must from the front be provided with an internal thread.  

In many applications of the invention, however, it will sufficient, only a sleeve-shaped dowel foot with a To provide internal thread, so that its diameter corresponds to that of the shaft core.

To a material jam in this embodiment parts of the dowel body should be bent be designed. Here it will prove necessary prove the dowel body with appropriate To provide slots, preferably longitudinal slots, thus longitudinal bars that can be folded out on the dowel body itself arise. Then migrates due to a screwing of the Dowel foot along the screwable body, so kink these bridges and an area of Web entanglements, which are like a material jam are clogged and come to light in cavities.

So that these longitudinal slots become even better compact web linkage can be bundled, it is provided that successive longitudinal slots are divided by bridges.

Such a fastener according to the invention is easy to manufacture and by the end user easy to use. Should the end user for example, selected a borehole a little too large have wings on the dowel body molded on, which compensate for these inaccuracies in fit, so that the dowel body is not when screwing turns with. Of course, such wings can also be molded out of the elastic material.

Overall, a fastener is created by the invention tion element, which is versatile and a is settable and always a consistently good fastening effect.  

In a further embodiment of the invention should be in the area of the screw head the dowel body integrally molded a washer for fixing insulation materials be. This also exists in this embodiment Fastening element from the unit of screw and Dowel body. Insulation materials, such as for example pures, styrofoam or the like, from fastening tion elements connected with masonry, the Head of the fastener usually on the Surface of the insulation is visible. That head is then covered by an appropriate hood. However, this does not prevent prolonged use the screw or hood weathered and oxidation leaves traces as noses. Furthermore, the screw forms a cold bridge through the insulation.

This is due to the attachment according to the invention element prevented. This also includes a procedure which consists in the fact that in the insulation or Masonry is drilled a center hole in advance. The Centering hole is then used to insert a centering pin of a tool over which the countersunk hole is produced. This tool preferably points to one Cutting the undersurface of a measuring body. The measure body has a diameter and a height, which correspond to the corresponding dimensions of the countersunk hole correspond. In addition, a stop washer is featured see so the depth of penetration of the tool is limited. For example, this tool connected to a drill, so an ent speaking countersunk hole centered in the insulation be brought.  

Then the fastening is hammered in element and tightening the screw. The last Procedural step is the insertion of an insert, through which the countersunk hole is closed and in particular the disc or the screw head is covered. This insert should be slightly above the surface protruding from the insulation material, there is still an ab grind. This will influence the weather Prevents screw head and the occurrence of a cold avoided bridge.

In another and extremely interesting version Example of the invention consists of the dowel body two parts. A sleeve closes the screw head which is usually the smooth part of the screw surrounds. From the other side is the thread part of the screw a normal dowel screwed on, like he is known for example from DE-OS 36 40 312. This embodiment is primarily for use in gas suitable for concrete. Through it there is a quick, deep horizontal fastening inside the wall. Already through that Drive in, which for the most part without pre-drilling can happen, a material is created around the dowel seal or solidification. By a few turns of the with the screw driven in, this is screwed in axially contracted so that the dowel a undercut hole and space for anchoring creates.

The fastening deep inside the wall prevents one The wall material bursts on the surface. It very high holding values are achieved.  

This fastener is also particularly useful for setting battens or the like on one Masonry. The sleeve penetrates the battens, while the dowel sits in the masonry. The battens can, for example, by unscrewing the screw removed together with the sleeve and again at any time be used because the dowel remains in the masonry and basically serves as a mother there.

This dowel can of course also be used with a appropriate washer for fixing insulation materials be formed as described above. From all possible Combinations of features may be included.  

Other advantages, features and details of the Er Find the following description a preferred embodiment and based on the Drawing; this shows in

Figure 1 is a perspective view of a fastener according to the Invention.

Fig. 2 shows a cross section through the Befestigungsele element of Figure 1 along line II-II.

Fig. 3 is a side view of another embodiment example of a fastener;

Figure 4 is a side view of the fastener in a different position of use.

Fig. 5 shows a longitudinal section through a further example of a guide from Be fastening element according to the invention;

Fig. 6 is an illustration of the application of the Ausfüh approximately example of a fastener shown in FIG. 5;

Fig. 7 is a plan view of a tool for the manufacture of a countersunk hole;

Figure 8 is a plan view of another embodiment example of a fastener.

Fig. 9 is a longitudinal section through the mounting element of FIG. 8.

According to FIG. 1, a fastening element R consists of a screwable body, for example a Spax 1 and a film 2 which surrounds the Spax 1 circumferentially. This film 2 encloses both the threaded shaft 3 of the spax 1 and its head 4 , which for the sake of clarity is not shown with a cross recess.

The film 2 can be shrunk up to the Spax 1, for example. There is also the possibility of applying the film 2 to the spax 1 by means of a vacuum or using the immersion method. There should be no limit to the invention here. An advantage of this imple mentation form is that the hole diameter can correspond to the screw diameter.

In a further embodiment of the invention according to FIGS. 3 and 4, a Spax 1 or the like fastening screw is inserted into a dowel body 5 . This dowel body 5 has a continuous longitudinal bore 6 , which is only shown in dashed lines in Fig. 3. This longitudinal bore 6 has a diameter d , which corresponds at least to the diameter d _{1 of} a shaft core 7 of the fastening element 1 . This diameter d ₁ is maintained at least by a sleeve-shaped or nut-shaped dowel foot 8 , so that here either an internal thread section is cut into the dowel foot by the fastening element 1 or is already present from the beginning. The remaining part of the longitudinal bore 6 can also have this diameter d ₁ , so that here too an internal thread is created when the fastening element 1 is inserted or is present from the beginning.

But it is also conceivable that the remaining part has a larger diameter, so that the fastening element 1 can be inserted without resistance through the longitudinal bore 6 in the dowel body 5 and only has to penetrate the dowel base 8 in a screwing motion.

The dowel body 5 is preferably interspersed with longitudinal slots 9 between the head area 4 and the dowel foot 8 . In the longitudinal direction successive longitudinal slots 9 can be separated from one another by corresponding webs 10 .

The effect of the device according to the invention is the following:

Known wood screws, chipboard screws, convex screws or similar preferably self-tapping threaded screws are inserted into the dowel body 5 or surrounded with the film 2 .

This creates a so-called "nail screw anchor". This pre-screwed or pre-assembled nail screw dowel is hammered through by the end user like a nail with a hammer into a pre-drilled hole. Then the fastener 1 is rotated. In the exemplary embodiment according to FIG. 1, part of the film 2 migrates towards the head 4 as a result of the rotary movement. This creates a material jam at one point within the predrilled hole, which leads to the fastening element R being fixed.

In the exemplary embodiment according to FIGS . 3 and 4, the sleeve-shaped dowel foot 8 moves along the fastening element 1 in the direction of the head 4 . As a result of the longitudinal slots 9 , parts of the dowel body 5 can buckle and thus form a web link 11 , which also leads to a secure fixing of the dowel in all solid, porous or void-containing construction materials.

Another feature of the invention lies in the molding of wing strips 12 on the dowel body 5 near the head 4 . These wing strips 12 prevent the dowel body 5 from rotating if a borehole into which the dowel body is inserted together with the Spax 1 has been selected too large. In this borehole, the dowel body 5 is held by the wing strips 12 so that the spax 1 can be rotated until the web linkage 11 has its effect.

Referring to FIG. 5, a further embodiment of the fastening element R 2 also consists of a lumpy a plug body 5, in which a fastening screw 1 is inserted. However, the dowel body 5 is formed near a screw head 13, a disc 14 , which is supported via wing strips 12 a against the dowel body 5 .

This fastener R 2 is mainly used to fix insulation materials 15 (see FIG. 6), such as purees, styrofoam or the like on a masonry 16th

A countersunk hole 17 is formed in the insulating material 15 . This is done by means of a corresponding countersink drill 18 , which is shown in FIG. 7. This countersink drill 18 is preferably a plastic injection molded part, which is produced in one piece. The countersink 18 is inserted, for example, into the chuck of a drilling machine via a shaft 19 . A centering pin 20 serves to center the countersink drill 18 in a predrilled hole in the insulation material 15 or the masonry 16 . Between shaft 19 and centering pin 20 there is a measuring body 21 , the diameter d ₂ and height h of which corresponds to that of the countersunk hole 17 .

This measuring body 21 has cutters 23 formed on its lower surface 22 , which cut into the insulating material 15 and thus produce the countersunk hole 17 . The depth of penetration of the measuring body 21 is limited by a stop disk 24 .

After the production of the countersunk hole 17 , the fastener R 2 will hit the masonry 16 . By turning the screw 1 , the dowel foot 8 acting as a nut is tightened, so that a material jam, as described above for FIG. 4, occurs within the masonry 16 . As a result, the insulation 15 is fixed on the masonry 16 without, for example, pressure being exerted on the insulation 15 via the screw head 13 .

After fixing, the countersunk hole 17 is closed by means of an insert 25 , the outer contours of which correspond to those of the countersunk hole 17 . If the insert 25 protrudes somewhat above the countersunk hole 17 , grinding is sufficient, so that the entire surface of the insulating material is also visually balanced.

In a further embodiment of the fastening element R 3 according to FIGS. 8 and 9, the dowel body 5 is formed in two parts. The first part consists of a dowel 26 , as described in DE-OS 36 40 312. However, a dowel according to DE-PS 22 54 602 can also be used. The only essential thing is that the dowel here again has a dowel foot 8 which acts accordingly as a nut and which is penetrated by the tip of the screw 1 .

The second part of the dowel body 5 consists of a simple, smooth sleeve 27 which is supported with a collar 28 against the screw head 13 . This sleeve 27 surrounds the smooth, non-threaded part of the screw 1 . In contrast, the collar 28 would be omitted in the case of a hexagon screw head.

This fastening element R 3 is intended for quick, deep-lying anchoring in the interior of light building materials. It is hammered in, for example, in quality concrete G 2 and G 4 without pre-drilling a hole.

Then the screw is tightened. By tightening the screw 1 , the dowel 26 is contracted in the axial direction, resulting in a material jam, as a result of which it is anchored deep inside the wall.

Should it be necessary to loosen the screw, for example to remove battens, the sleeve 27 with the screw 1 lifts off the masonry while the nozzle remains in its anchoring. The object to be fastened can, for example, be corrected and then fastened again without problems, since the screw again hits the dowel remaining in the masonry, which then acts entirely as a nut.

Claims (20)

1. Fastening element with a screwable body made preferably of a threaded shaft and head, for example a wood screw, preferably chipboard screws, characterized in that at least the threaded shaft ( 3 ) of the body ( 1 ) at least partially with an elastic material ( 2 ) or a dowel body ( 5 ) is dressed. 2. Fastening element according to claim 1, characterized in that both threaded shaft ( 3 ) and head ( 4 ) of the elastic material ( 2 ) or a dowel body ( 5 ) are covered. 3. Fastening element according to claim 1 or 2, characterized in that the elastic material as a film ( 2 ) around the threaded shaft ( 3 ) and possibly. Head ( 4 ) is placed and shrunk. 4. Fastening element according to claim 1 or 2, characterized in that the elastic material ( 2 ) in the immersion process, the threaded shaft ( 3 ) or, if necessary. Head ( 4 ) is applied. 5. Fastening element according to claim 1 or 2, characterized in that the elastic material ( 2 ) is applied under vacuum to the threaded shaft ( 3 ) and possibly the head ( 4 ). 6. Fastening element according to claim 1 or 2, characterized in that the dowel body ( 5 ) has a longitudinal bore ( 6 ) whose diameter ( d ) is equal to or larger than the diameter ( d ₁ ) of a shaft core ( 7 ) of the body ( 1 ). 7. Fastening element according to claim 6, characterized in that at least one sleeve-shaped dowel foot ( 8 ) has a diameter ( d ) which corresponds to the diameter ( d ₁ ) of the shaft core ( 7 ). 8. The fastening element according to claim 7, characterized in that the longitudinal bore (6) at least has an internal thread in the region of the dowel foot (8). 9. Fastening element according to one of claims 6 to 8, characterized in that the dowel body ( 5 ) in front of the dowel foot ( 8 ) has longitudinal slots ( 9 ). 10. Fastening element according to claim 9, characterized in that successive longitudinal slots ( 9 ) are divided by webs ( 10 ). 11. Fastening element according to at least one of claims 1 to 10, characterized in that wings ( 12 ) are integrally formed on the material ( 2 ) or dowel body ( 5 ). 12. Fastening element according to at least one of claims 1 to 11, characterized in that in the region of the screw head ( 13 ) the dowel body ( 5 ) has a disc ( 14 ) for fixing insulation materials ( 15 ), such as purees, polystyrene or the like. , is molded. 13. Fastening element according to claim 12, characterized in that the disc ( 14 ) on wing strips ( 12 a ) is supported against the dowel body ( 5 ). 14. Fastening element according to at least one of claims 1 to 13, characterized in that the dowel body ( 5 ) is divided into two. 15. Fastening element according to claim 14, characterized in that the dowel body ( 5 ) consists of a on the screw head ( 13 ) following sleeve ( 27 ) to which a dowel ( 26 ) strikes, which has the dowel foot ( 8 ), which of a threaded spindle of the screw ( 1 ) is penetrated. 16. Fastening element according to claim 15, characterized in that the sleeve ( 27 ) is supported via an annular collar ( 28 ) against the screw head ( 13 ) or has the disc ( 14 ). 17. Tool for producing a countersunk hole in insulating materials for the use of a fastening element according to one of claims 12 to 16, characterized in that a lower surface ( 22 ) of a measuring body ( 21 ) with the diameter ( d ₂ ) and the height ( h ) the countersunk hole ( 17 ) have cutters ( 23 ) formed on them and a stop disc ( 24 ) is placed opposite them. 18. Tool according to claim 17, characterized in that on the stop disc ( 24 ) a shaft ( 19 ) and on the lower surface ( 22 ) connects a centering pin ( 20 ). 19. Tool according to claim 17 or 18, characterized records that it is integrally made of plastic is injected. 20. Procedure for specifying insulation materials, for example wise on a brickwork with a fastener supply element according to claims 12 to 16, characterized in that in the insulating material or the masonry a center hole (dowel hole) drilled in, then created a countersunk hole that Fastener hammered in, the screw tightened and the countersunk hole with an insert preferably the same insulation is covered.