Patent ID: 7011281
Filing Date: 2006-03-14
Classification: A63B,F16B,Y10S,Y10T

Abstract:
1. A method for releasably gripping a hole surface comprising: providing an expansion bolt comprising a collar, a cable slidingly running through said collar, a first chock connected to a first end of said cable, a second chock connected to said collar by a flexible rod, for cooperation with said first chock such that relative translation of said first chock in a first direction causes said first and second chocks to slidingly assume relative positions corresponding to an expanded configuration of the expansion bolt that grips the hole surface, and a cleaning bushing slidingly connected to said cable and captivated between said collar and first chock; said cleaning bushing being adapted to, in response to application of an impact force to said cleaning bushing, transmit a force to said first chock that results in a translation of said first chock relative to said second chock in a second direction opposite said first direction, to release said grip; wherein said cleaning bushing is adapted for transmitting to said first chock a substantial resulting force, and for transmitting to the second chock substantially no force, in response to the application of said impact force; and said cleaning bushing is adapted to translate relative to the collar so as to cause the release of said grip; inserting said chocks in a hole and causing the expansion bolt to adopt said expanded configuration; moving said cleaning bushing so as to make contact with said first chock; striking said cleaning bushing with a tool in said second direction so as to cause the expansion bolt to relax said grip; and pulling the expansion bolt out from the hole.