Expansion anchor

Abstract

An expansion anchor has an anchor member (21; 51) that has a longitudinal bore (24), a load application element (25, 55) and an expansion section (22; 52) located between first and second sections (26, 27; 56, 57) of the anchor member (21) and a cross-section of which widens from the first section (26; 56) toward the second section (27; 57; and an expansion sleeve (13; 43) having an axial longitudinal bore (14) with which it is guided over the first section (26; 56) of the anchor member (21; 41) and an expansion region (15) located adjacent to the expansion section (22; 52) of the anchor member (21; 41), with at least one of the anchor member (21; 41) and the expansion sleeve (13; 43) having at least one through-opening (18; 58) for a hardenable mass (31) and which opens into one of the axial bore (54) of the anchor member or the axial bore (14) of the expansion sleeve.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings show:

FIG. 1 a cross-sectional view of a first embodiment of an expansion anchor according to the present invention in an anchored-in-a constructional component condition; and;

FIG. 2 a cross-sectional view of second embodiment of an expansion anchor according to the present invention.

Basically, in both figures, the same elements are designated with the same reference numerals.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

An expansion anchor 11 according to the present invention, which is designed for being anchored in a borehole 7 and which is shown in FIG. 1, extends along a longitudinal axis 12 and includes two anchor elements, namely, an anchor member 21 and an expansion sleeve 13. The anchor member 21 has a first axial longitudinal bore 24, a section with an inner thread that forms load application means 25, a first section 26 and a second section 27, and an expansion section 22 located between the first and second sections 26, 27 and a cross-section of which widens from the first section 26 toward the second section 27.

The expansion sleeve 13 has a second axial longitudinal bore 14 with which it is guided over the first section 26 of the anchor member 21. The expansion sleeve 13 has an expansion region 15 which is formed by a slot 16 and is located adjacent to the expansion section 22 of the anchor member 21. In the expansion sleeve 13, there are provided through-openings 18 for a hardenable mass 31 and which open toward the second axial longitudinal bore 14. Thus, the through-openings 18 connect the second axial longitudinal bore 14 with the outer surface of the expansion sleeve 13 and, thus, with an outer surface of the expansion anchor 11. The through-opening 18 are located outside of the expansion region 15 of the expansion sleeve 13 and are formed in the wall of the expansion sleeve 13.

For a forcelocking anchoring the expansion anchor 11 and for anchoring it in a material-locking manner, a borehole 7 is formed in a constructional component 6, and the anchor member 21 is pushed into the borehole 7 until it contacts the bottom 8 of the borehole 7. Then, the expansion sleeve 13 is inserted in the borehole 7 with the expansion region 15 facing the bottom 8, and is pushed axially in a setting direction S onto the anchor member 21 with a setting tool, not shown. With the expansion sleeve 13 being pushed onto the anchor member 21, the expansion region 15 of the expansion sleeve 13 expands, and the expansion anchor 11 forcelockingly anchors in the constructional component 6, with controlling the displacement of the expansion sleeve 13. Finally, the borehole 7 is filled with the hardenable mass 31, with the liquid or semi-liquid hardenable mass 31 flowing into the remaining space in the borehole 7 through the through-openings 18. Then, an anchor rod, which forms the attachment member 36 (shown with dash lines) and which has an outer thread complimentary to the inner thread of the anchor member 21, is screwed into the inner thread of the anchor member 21. With a nut 9 (shown with dash lines), which is screwed onto a free end 27 of the attachment member 36, an add-on part 5 is secured to the constructional component 6.

In the expansion anchor 41, which is shown in FIG. 2, a plurality of axially and radially spaced from each other, through-bores 58 for a hardenable mass are formed in an anchor member 51 that has a first section 56, a second section 57, and an expansion section 52 located between the first and second sections 56, 57 and the cross-section of which widens from the first section 56 toward the second section 57. The through-openings 58 are formed in the second section 57 of the anchor member 51 and connect the first axial longitudinal bore 54 of the anchor member 51 with an outer surface of the anchor member 51 and, thus, with an outer surface of the expansion anchor 41. An inner thread that forms load application means 55 for a fastening element (not shown), extends from a free end 53 of the anchor member 57 in a direction opposite the setting direction S over a region of the first axial longitudinal bore 54. An expansion sleeve 43 is guided over the first section 56 that adjoins the expansion region 52. An axial extension of the expansion region 52 and the first section 56 in the direction of the longitudinal axis 42 is greater than a corresponding longitudinal extension of the expansion sleeve 43.

Though the present invention was shown and described with references to the preferred embodiments, such are merely illustrative of the present invention and are not to be construed as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the art. It is, therefore, not intended that the present invention be limited to the disclosed embodiments or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. An expansion anchor for being anchored in a borehole (7), comprising an anchor member (21; 51) having a first axial longitudinal bore (24; 54), load application means (25,55), a first section (26; 56), a second section (27; 57), and an expansion section (22; 52) located between the first and second sections (26, 27; 56, 57) and a cross-section of which widens from the first section (26; 56) toward the second section (27; 57); and an expansion sleeve (13; 43) having a second axial longitudinal bore (14) with which it is guided over the first section (26; 56) of the anchor member (21; 41) and an expansion region (15) located adjacent to the expansion section (22; 52) of the anchor member (21; 41), wherein at least one of the anchor member (21; 41) and the expansion sleeve (13; 43) has at least one through-opening (18; 58) for a hardenable mass (31) and which opens into one of the first axial bore (54) and the second axial bore (14), respectively.

2. An expansion anchor according to claim 1, wherein the at least one through-opening (18) is formed in the expansion sleeve (13).

3. An expansion anchor according to claim 2, wherein the at least one through-opening (18) is located outside of the expansion region (15) of the expansion sleeve (13).

4. An expansion anchor according to claim 1, wherein the at least one through-opening (58) is formed in the anchor member (51).

5. An expansion anchor according to claim 4, wherein the at least one opening is located in the second section (56) of the anchor member (51).

6. An expansion anchor according to claim 1, wherein the at least one through-opening (18; 58) is a bore.