Full sleeve retainer for step-shank of tool

Details Full sleeve retainer for step-shank of tool Full sleeve retainer for step-shank of tool

E - Fixed Constructions

21

C

E21C 35/197 (2006.01) E02F 9/28 (2006.01)

Patent

CA 2731317

A tool pick assembly and a tool and block assembly are disclosed. A sleeve is positioned about the shank to allow rotation of the tool pick and also friction fit with the block. The sleeve is stepped in complement to the shape of the surface of the shank of the tool pick and the shape of the surface of the bore in the tool holder and extends substantially all of the length, optionally all of the length, of the stepped bore in the block to reduce or prevent dust and fines from entering and wearing the bore surface. When assembled, the stepped sleeve and complementarily shaped shank of the tool pick each do not extend past the rear surface of the bore to mitigate or prevent shank deformation from impact during use.

Linvention concerne un ensemble pioche et un ensemble outil et bloc. Un manchon est positionné autour du manche pour permettre la rotation de la pioche et également lajustement serré avec le bloc. Le manchon est étagé selon la forme de la surface du manche de la pioche et la forme de la surface du trou dans le support doutil et sétend sensiblement sur toute la longueur, éventuellement sur toute la longueur, du trou étagé dans le bloc pour empêcher les poussières et les fractions fines de pénétrer dans la surface du trou et d'user celle-ci, ou pour réduire ladite pénétration et ladite usure. Lorsqu'ils sont assemblés, le manchon étagé et le manche de la pioche formé en fonction de celui-ci ne s'étendent chacun pas au-delà de la surface arrière du trou pour atténuer ou empêcher la déformation du manche due aux chocs pendant l'utilisation.

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