Sleeve with widening taper at rearward end of bore

E - Fixed Constructions – 21 – C

Patent

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Details

E21C 35/197 (2006.01) E21C 35/18 (2006.01) E21C 35/19 (2006.01)

Patent

CA 2723281

A block and sleeve assem-bly and a sleeve per se are disclosed. The sleeve has a central bore with a rearwardly opening taper. The holder block has a side--to-side opening with a bridge. An angle of the rearwardly opening taper and/or the dis-tance from the beginning of the taper of the central bore of the sleeve to the surface of the side-to-side opening are sized to allow rearward removal of a shank of a sheared cutting pick from the sleeve. Optionally, an outer circumferential surface of at least a portion of the sleeve shank is forwardly ta-pered and the opening in the holder block is complementarily tapered to receive the sleeve shank. A rearward biasing retainer clip can also optionally be included.

L'invention concerne un ensemble bloc et manchon, ainsi qu'un manchon en soi. Ce manchon comprend un trou central présentant une partie évasée ouverte sur l'arrière. Le bloc support présente une ouverture bord à bord et un pont. Un angle de la partie évasée ouverte sur l'arrière et/ou la distance entre le début de la partie évasée du trou central du manchon et la surface de l'ouverture bord à bord sont fixés de sorte qu'une tige d'un pic coupant cisaillé puisse être retirée du manchon par l'arrière. Optionnellement, une surface périphérique extérieure d'au moins une partie de la tige du manchon est conique vers l'avant et l'ouverture ménagée dans le bloc support présente une forme conique complémentaire pour pouvoir recevoir la tige du manchon. L'ensemble peut comprendre également un accessoire de retenue exerçant une sollicitation vers l'arrière.

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