METHOD AND SYSTEM FOR SETTING A SELF-CUTTING UNDERCUT ANCHOR

Abstract

The invention relates to a method and system for setting a self-cutting the undercut anchor in an anchor base.

Claims

1. A method of setting a self-cutting undercut anchor (10) in an anchor base (11), wherein the undercut anchor (10) includes an expansion sleeve (12), divided into expansion tongues (18) by longitudinal slots (14), which are arranged in the setting direction (16) in the front region of the expansion sleeve (12), and which has an internal thread (20) in the setting direction (16) in the rear region, and wherein the undercut anchor (10) includes an expansion body (22), arranged within the expansion sleeve (12) in the setting direction (16) in the front region of the expansion sleeve (12), having the following method steps: a) screwing a flanged sleeve (24) into the internal thread (20) of the expansion sleeve (12), disposed in the rear region in the setting direction (16), b) introducing the expansion sleeve (12) into a bore (26), introduced in the anchor base (11), in such a way that the flanged sleeve (24), fastened to the expansion sleeve (12), is placed with the lower face of the flange (28) on the anchor base (11), or the upper edge (30) of the bore (26), c) inserting a drive-in bolt (32) through the flanged sleeve (24) into the expansion sleeve (12), d) driving in the drive-in bolt (32) in the setting direction (16) in such a way that the expansion body (22) is pressed forwards, that is to say deeper into the expansion sleeve (12), through the end (36) of the drive-in bolt (32), which is at the front in the setting direction (16), in such a way that the expansion tongues (18) are expanded for anchoring in the anchor base (11) and cut with the cutting edges (38) into the anchor base (11), and e) removing the drive-in bolt (32), or the flange sleeve (24) together with the drive-in bolt (32), from the expansion sleeve (12).

2. A method as claimed in claim 1, characterized in that the method step c) is carried out prior to step b).

3. A method as claimed in claim 1, characterized in that the introduction of the drive-in bolt (32) through the flanged sleeve (24), according to method step c), is carried out prior to step a) so that the flanged sleeve (24) and the drive-in bolt (32) together form an assembly tool, and subsequently, as set forth in method step a), the flanged sleeve (24) with drive-in bolt (32) is screwed into the inner thread (20) of the expansion sleeve (12), disposed in the setting direction (16) in the rear part, wherein step c) is then omitted.

4. A method as claimed in claim 1, wherein the bolt head (34) of the drive-in bolt (32) rests on the upper side of the flange (28) of the flanged sleeve (24) when driving in.

5. A method as claimed in claim 1, wherein the flanged sleeve (24) together with the drive-in bolt (32), or the flanged sleeve (24) after removal of the drive-in bolt (32), is removed from the expansion sleeve (12) by unscrewing, whereas the flange (28) of the flanged sleeve (24) is preferably designed as a tool application element, preferably as a hexagon.

6. A method as claimed in claim 1, wherein the bore (26) is drilled so that its length (L) is at least equal to, or preferably greater than, the length (L1) of the expansion sleeve (12).

7. A method as claimed in claim 1, wherein the undercut anchor (10) is anchored near the surface, so that, in the setting direction (10), the rear end of the expansion sleeve (12) essentially terminates at the bore edge (30).

8. A method as claimed in claim 1, wherein after removal of the drive-in bolt (32) or of the flanged sleeve (24) together with the drive-in bolt (32), an anchored expansion sleeve (12) is available for further use, preferably for fixing of components, whereby the corresponding fixing elements are screwed into the expansion sleeve (12).

9. A method as claimed in claim 1, wherein setting the undercut anchor (10) is carried out at least semi-automatically by way of the undercut anchor (10), as a unit consisting of an expansion sleeve (12) and an expansion body (22), integrally with the assembly tool from a flanged sleeve (24) and a drive-in bolt (32), being driven into the bore (26), while the drive-in bolt (32) is preferably inserted, and in any case the flanged sleeve (24) is removed from the expansion sleeve (12), preferably by, unscrewing, together with the drive-in bolt (32) using a machine, preferably a hammer drill with a special extension.

10. A method as claimed in claim 9 characterized in that the assembly tool, connected with the machine or attached to it, composed of flanged sleeve (24) and drive-in bolt (32), is provided with a new expansion sleeve (24) with expansion body (22) after being removed from the expansion sleeve (12), so that a new cycle can be carried out for setting the self-cutting undercut anchor (10).

11. A system for setting an undercut anchor (10) in an anchor base (11), consisting of a) an undercut anchor (10) with an expansion sleeve (12) which is subdivided into expansion tongues (18) by longitudinal slots (14), arranged in the setting direction (16) in the front part of the expansion sleeve (12), and which has an internal thread (20) in the setting direction (16) in the rear region, and having an expansion body (22) within the expansion sleeve (12), disposed in the setting direction (16) in the front region of the expansion sleeve (12), b) a flanged sleeve (24), which has an external thread and can be screwed accordingly into the internal thread (20) of the expansion sleeve (12) and c) a drive-in bolt (32) which can be inserted into the expanding sleeve (12) in the setting direction through the flanged sleeve (24).

12. A system as claimed in claim 11, characterized in that the drive-in bolt (32) a bolt head (34) in the setting direction (16) in the rear region, in particular at the rear end.

13. A system as claimed in claim 11, wherein the flange (28) of the flanged sleeve (24) has a section for gripping a tool, so that the flanged sleeve (24) can be easily screwed into and out of the expansion sleeve (12).

14. A system as claimed in claim 11, wherein the bolt head (24) is designed in such a way that, after it has been driven into and fixed on the flange, it shows a marking as evidence of a successful operation.

15. A system as claimed in claim 14 characterised in that the marks on the lower part of the bolt head (24) are visible grooves.

16. A system as claimed in claim 11, wherein the length of the drive-in bolt (32) is selected in such a way that the expansion body (22) is pressed into the expansion sleeve (12) to a predetermined depth to spread apart the expansion tongues (18) and to generate an undercut.

Description

[0043] The invention is hereafter depicted by means of an embodiment in a drawing. Using this method, the system for setting a self-cutting undercut anchor, according to the invention, shall be explained hereafter. Here same reference marks designate the same parts.

[0044] According to the invention, the system for setting an undercut anchor 10 in an anchor base 11, comprises [0045] an undercut anchor 10 with an expansion sleeve 12, which is subdivided into expansion tongues 18 by longitudinal slots 14, arranged in the setting direction 16 in the front part of the expansion sleeve 12, and which has an internal thread 20 in the setting direction 16 in the rear region, and having an expansion body 22 within the expansion sleeve 12, disposed in the setting direction 16 in the front region of the expansion sleeve 12, [0046] a flanged sleeve (24), which has an external thread and can be screwed accordingly into the internal thread (20) of the expansion sleeve (12) and [0047] a drive-in bolt (32), which can be inserted into the expanding sleeve (12) in the setting direction through the flanged sleeve (24).

[0048] According to the invention, the method for setting a self-cutting undercut anchor comprises, after introducing a bore 26 in the anchor base 11, as shown in a) FIG. 1, the following method steps: [0049] Screwing a flanged sleeve 24 into the internal thread 20 of the expansion sleeve 12 disposed in the rear region in the setting direction 16, and introducing the expansion sleeve 12 into a bore 26 introduced in the anchor base 11 in such a way that the flanged sleeve 24 fastened to the expansion sleeve 12 is placed with the lower face of the flange 28 on the anchor base 11 or the upper edge 30 of the bore 26, as shown in c) FIG. 1, [0050] Inserting a drive-in bolt 32 through the flanged sleeve 24 into the expansion sleeve 12, as shown in c) FIG. 1, [0051] Driving in the drive-in bolt (32) in the setting direction (16), as shown in FIG. 1, in such a way that the expansion body (22) is pressed forwards, that is to say deeper into the expansion sleeve (12), through the end 36 of the drive-in bolt 32, which is at the front in the setting direction 16, in such a way that the expansion tongues 18 are expanded for anchoring in the anchor base 11, and cut with the cutting edges 38 into the anchor base [0052] Removing the flange sleeve 24, together with the drive-in bolt 32, from the expansion sleeve (12) as shown in the FIG. 1.

LIST OF REFERENCE NUMERALS

It is Part of the Description

[0053] 10 Undercut anchor [0054] 11 Anchor base [0055] 12 Expansion sleeve [0056] 14 Longitudinal slots [0057] 16 Setting direction [0058] 18 Expansion tongues [0059] 20 Internal thread [0060] 22 Expansion body [0061] 24 Flanged sleeve [0062] 26 Bore [0063] 28 Flange [0064] 30 Top edge [0065] 32 Drive-in bolt [0066] 34 Bolt head [0067] 36 Front end [0068] 38 Cutting edge