E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
85/31
E21D 21/00 (2006.01)
Patent
CA 1198007
ROOF SUPPORT PIN ABSTRACT A roof support pin for insertion into a roof bore having an opening comprising an elongate tube for insertion into the bore, the tube being compressed prior to insertion of the tube into the bore opening so that the tube expands to frictionally engage the bore a distance from the bore opening. In one as- pect, a roof support plate has a hole with a diameter smaller than the diameter of the bore. The plate hole compresses the diameter of the tube upon insertion of the tube into the bore through the plate hole. In another aspect, a plurality of rings are longitudinally spaced axially on and retain the tube compressed prior to insertion of the tube through the plate hole into the bore. The rings slidably engage the tube for retention at the plate for allowing the tube to expand within the bore. In yet another aspect, a spiral strip wraps and re- tains the tube compressed prior to insertion into the bore. The spiral strip is stripped from the tube as the tube is in- serted through the plate hole. In one aspect, the tube includes a plurality of interior and exterior grooves with the grooves allowing the tubes to be circumferentially compressed. In another aspect, the tube includes adjacent longitudinal edges forming a longitudinal slit. The tube edges engage and are turned inwardly at the longitudinal slit as the tube is circum- ferentially resiliently compressed.
371328
Elders Gerald W.
Fetherstonhaugh & Co.
LandOfFree
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