E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
E21D 20/02 (2006.01) E21D 21/00 (2006.01)
Patent
CA 2485457
The invention comprises a roof bolt (2) and nut (10) in screw threaded engagement, said bolt (2) comprising a shaft (4) for insertion in a hole (40) drilled in a mine roof and a threaded portion (6) engaged by the nut (10) whereby the bolt (2) may be rotated. The nut (10) is offset with respect to the longitudinal axis of the shaft (4) of the bolt (2) so that when the bolt (2) is rotated by means of the nut (10), the bolt (2) is caused to describe a circle of greater diameter than its own diameter, the amount of said offset being from about 0.015 to about 0.50 inches. Preferably the offset is from about 0.02 to about 0.25 inches. The nut (10) may be releasably locked in screw threaded engagement with the bolt (2) so that the bolt (2) can be rotated by means of the nut (10) and above a selected torque the nut (10) will break out.
L'invention concerne un boulon au toit (2) et un écrou (10) filetés, ledit boulon (2) comprenant un arbre (4) destiné à être inséré dans un trou (40) percé dans le toit d'une mine et une partie filetée (6) sur laquelle vient se visser l'écrou (10), permettant ainsi au boulon (2) de tourner. L'écrou (10) est décalé par rapport à l'axe longitudinal de l'arbre (4) du boulon (2) de manière que, lorsque le boulon (2) tourne à l'aide de l'écrou (10), le boulon (2) décrit un cercle de plus grand diamètre que son propre diamètre, ledit décalage allant d'environ 0,015 à environ 0,50 pouces. Le décalage varie, de préférence, entre environ 0,02 et environ 0,25 pouces. L'écrou (10) peut être vissé de manière amovible au boulon (2), de façon que le boulon (2) puisse tourner à l'aide de l'écrou (10). L'écrou (10) se brise au-delà d'un couple sélectionné.
Gowling Lafleur Henderson Llp
Minova International Limited
LandOfFree
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