Chain saw including an overtorque releasing clutch

B - Operations – Transporting – 27 – B

Patent

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Details

192/26, 143/7

B27B 17/10 (2006.01) B27B 17/08 (2006.01) F16D 43/202 (2006.01) F16D 43/24 (2006.01)

Patent

CA 1063912

ABSTRACT OF THE INVENTION Disclosed herein is a clutch comprising a drive member adapted to be mounted for rotation and having one or more clutch teeth, a driven member having one or more clutch teeth adapted to drivingly engage the drive member clutch teeth and being mounted for rotation coaxially with the drive member, one of the drive and driven members being mounted for axial movement relative to the other between a released position wherein the drive and driven members are disengaged and a driving position wherein the drive and driven members are in driving engagement to afford transmission of torque therebetween with the clutch teeth coacting to produce a separating force directed axially in one direction and tend- ing to axially displace the one of said drive and driven members toward the released position, and a resilient element interacting with the one of the drive and driven members and being movable between a first position wherein the resil- ient element yieldably resists axial displacement of the one of the drive and driven members toward the release position and a second position which is spaced from the first position so as to permit movement of the one of the drive and driven members to the released position, the resilient element being moveable from the first position to the second position when the axially directed separating force exceeds a predetermined level, and the resilient element remaining in the second position in the absence of a reset force applied thereto in the direc- tion opposite from the one direction.

280832

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