E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
85/24
E21D 21/00 (2006.01) F16B 13/06 (2006.01) F16B 13/00 (2006.01)
Patent
CA 2030949
An expandable mine bolt assembly having a shell and wedge unit threaded upon the shank of an elongated bolt. The shell contains at least one or more leaf sections. The arms of a U- shaped metal strap are joined to the shell and the strap is arranged to pass over the wedge and the distal end of the bolt. At least one arm of the strap is provided with a wrapped section containing folded legs. The distal end of the bolt applies pressure against the strap as the bolt is threaded through the wedge which, in turn, causes the legs of the wrapped section to unfold into holding contact against the wall of a receiving hole thereby preventing the assembly from spinning in the hole as the shell is being expanded by the wedge.
oulon de mine extensible composé d'un ensemble coquille et coin vissé sur la tige d'un boulon allongé. La coquille comprend une ou plusieurs ailettes. Les bras d'une bande de métal en U sont reliés à la coquille et la bande passe au-dessus du coin et de l'extrémité distale du boulon. Au moins un des bras de la bande est muni d'une partie enveloppée contenant des pattes repliées. L'extrémité distale du boulon applique une pression sur la bande lorsque le boulon est enfilé sur le coin qui, à son tour, provoque les pattes de la partie enveloppée à se déplier au contact de la paroi d'un trou, empêchant ainsi le boulon de tourner dans le trou au moment où la coquille est dilatée par le coin.
Eastern Company (the)
Macrae & Co.
LandOfFree
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