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Class Information
Number: 405/259.2
Name: Hydraulic and earth engineering > Earth treatment or control > Rock or earth bolt or anchor > Frangible bolt
Description: Subject matter comprising a bolt having structure or a property such that it will break at a predetermined torque.

Patents under this class:

Patent Number Title Of Patent Date Issued
8690484 Sheathed cable Apr. 8, 2014
8434970 Breakable rock bolt May. 7, 2013
6637980 Method and apparatus for re-tensioning a roof bolt in an underground mine Oct. 28, 2003
6533503 Mortar composition, curable by frontal polymerization, and a method for fastening tie bars Mar. 18, 2003
5873689 Low torque threaded fastener and mine roof support system using such a fastener Feb. 23, 1999
5443332 Rockbolt tensioning Aug. 22, 1995
5352065 Rock bolting Oct. 4, 1994
5033909 Coupling for anchor rod and sleeve Jul. 23, 1991
4955758 Reinforcing method and means Sep. 11, 1990
4764055 Resin reinforced expansion anchor system Aug. 16, 1988
4750887 Anchor bolt assembly Jun. 14, 1988
4662795 Method of supporting a mine roof using nut element with breakable portion May. 5, 1987
4652179 Method of and device for severing a tension member in a prestressed grouted anchor Mar. 24, 1987
4618291 Nut member and mine roof support system incorporating same Oct. 21, 1986
4431348 Force transmission device Feb. 14, 1984
4193715 Mine roof support method and apparatus Mar. 18, 1980
4122681 Mine roof support assembly Oct. 31, 1978
4051683 Method and apparatus for supporting a mine roof Oct. 4, 1977
4023373 Anchor bolt assembly and utilization May. 17, 1977
3979918 Rock bolts Sep. 14, 1976

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