E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
85/24
E21D 21/00 (2006.01)
Patent
CA 1294157
HOLLOW FIBER GLASS ROOF BOLT ABSTRACT OF THE DISCLOSURE The present invention is directed to a hollow roof bolt based on a) a hollow rod, b) a collar which is internally tapered and fitted over one end of the rod and c) a hollow plug located in the end of the rod having the collar, the plug being externally tapered such that it forces the rod to expand and thereby conform to the internal taper of the collar. The present invention is additionally directed to the rod in combination with a roof plate such that the roof plate fits flush against the distant end of the collar.
549972
Duff Howard S.
Jacks R. Keith
Perry John H.
Duff Howard S.
Jacks R. Keith
Miles Inc.
Ogilvy Renault
Perry John H.
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