Undercut-engaging dowel

• US 6,132,152 A
• Filed: 05/25/1999
• Issued: 10/17/2000
• Est. Priority Date: 06/10/1998
• Status: Expired due to Term

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Kaibach, Werner, Raber, Stefan, Negele, Hans-Jurgen
• Primary Examiner(s): WILSON, NEILL R
• Application Number:
  US09/320,124
• Time in Patent Office: 511 Days
• Field of Search: 411/30, 411/31, 411/32, 411/54, 411/54.1, 411/57.1, 411/65, 411/66
• US Class Current: 411/54.1
• CPC Class Codes: F16B 13/0858 with an expansible sleeve or dowel body driven against a tapered or spherical expander plug F16B13/004 takes precedence

Abstract

A dowel including an anchor rod (2; 22) having a load application element at one of its longitudinal ends and a head (3; 23), a diameter of which increases toward the free end of the anchor rod, at its opposite end, an expansion sleeve (4; 24) having a bore through which the anchor rod (2; 22) extends and a plurality of expansion tabs (5; 25) separated from each other by longitudinal slots (6; 26) and extending from a circumferential groove (7) toward the head (3; 23), the expansion tabs (5; 25) expanding radially, upon the expansion sleeve (4; 24) being displaced over the head (3; 23), and a substantially ring-shaped member (8; 28) arranged in the circumferential groove (7) and substantially filling out the circumferential groove (7; 27) in an expanded condition of the expansion tabs (5; 25).

Claims

1. An undercut-engaging dowel, comprising an anchor rod (2;

22) having load application means at one of longitudinal ends thereof and a head (3;

     23), the diameter of which increases to a free end of the anchor rod, at another of the longitudinal ends thereof, an expansion sleeve (4;

     24) having a central bore through which the anchor rod (2;

     22) extends, a circumferential groove (7;

     27), and a plurality of expansion tabs (5;

     25) separated from each other by longitudinal slots (6;

     26) and extending from the circumferential groove (7) toward the head (3;

     23), the expansion tabs (5;

     25) expanding radially, upon the expansion sleeve (4;

     24) being displaced over the head (3;

     23); and

a substantially ring-shaped member (8;

     28) arranged in the circumferential groove (7) and substantially filling out the circumferential groove (7;

     27) in an expanded condition of the expanded condition of the expansion tabs (5;

     25) for increasing resistance of the dowel in an anchoring condition thereof, to displacement under a load.

2. A dowel according to claim 1, wherein the ring-shaped member (8;

28) has a diameter (a) selected in a range. 7s≦

a≦

1.2s, where s is a largest outer diameter of the expansion sleeve (4;

     24).

3. A dowel according to claim 2, wherein the ring-shaped member (8;

28) has a diameter (a) selected in a range 0.8s≦

a≦

1.1s.

4. A dowel according to claim 2, wherein the ring-shaped member (8;

28) has an axial height selected in a range 0.05s≦

h≦

1.5s.

5. A dowel according to claim 4, wherein the ring-shaped member (8;

28) has an axial height selected in a range 0.1s≦

h≦

0.8s.

6. A dowel according to claim 1, wherein the ring-shaped member (8;

28) has a thickness substantially corresponding to a radial depth of the circumferential groove (7;

     27).

7. A dowel according to claim 2, wherein the ring-shaped member (8;

28) has an inner diameter selected in a range 0.5s≦

d≦

0.9s.

8. A dowel according to claim 1, wherein the ring-shaped member is formed of one of plastics and metal.

9. A dowel according to claim 1, wherein the ring-shaped member (8) has an axially extending separation slot (9).

10. A dowel according to claim 1, wherein the ring-shaped member is radially resiliently deformable.

11. A dowel according to claim 1, wherein the ring-shaped member is formed as a segmented member.

12. A dowel according to claim 1, wherein the ring-shaped member (28) is formed of a deformable material.

13. A dowel according to claim 1, wherein the ring-shaped member (28) is formed of one of silicone and a lead compound.