Back to results
US 5,401,131 AGranted
Expansion anchor
AssigneeYoshino Seiki Inc.
InventorYousuke Yoshino
Life of this patent
Estimating the term…
Abstract
An expansion anchor including an anchor stem having a holding flange and a lock member having a corrugated portion is inserted into a fitting hole bored in concrete or another rigid material. The anchor is secured in the bore by forcing the lock member to squash the corrugated portion. The corrugated portion thus squashed expands into engagement with the inner surface defining the bore so that the expansion anchor is steadily secured in a non-removable state.
Claims7
An expansion anchor to be secured in a fitting hole bored in a rigid object, which comprises:
- an anchor stem having a leading end and a holding flange attached to said leading end;
- a cylindrical lock member having a corrugated portion and a straight portion extending backward from said corrugated portion in a direction away from said leading end of the anchor stem, said anchor stem being received in said cylindrical lock member;
- and a driving collar integral with said straight portion of said lock member, said corrugated portion being squashed and expanded when said lock member is forced toward said holding flange by driving said driving collar, integral with the straight portion of said lock member, toward said holding flange.
Dependencies are inferred from the claim text.