Wrench ratchet mechanisms and wrenches

摘要

A wrench ratchet mechanism includes a driven member, a housing defining a chamber in which the driven member is at least partially received, a plurality of drive transmitting members disposed in respective recesses between the driven member and housing to transmit a drive force between the housing and driven member and a force applying member extending at least partially around the driven member. The force applying member is movable in a circumferential direction thereof to apply a circumferentially directed force to the drive transmitting members to move the drive transmitting members in the recesses from a non-drive transmitting position towards a drive transmitting position.

主权项

1. A wrench ratchet mechanism comprising:
a driven member; a housing defining a chamber in which said driven member is at least partially received; a plurality of drive transmitting members disposed in respective recesses between said driven member and housing to transmit a drive force between said housing and driven member; and a force applying member extending at least partially around said driven member and movable in a circumferential direction thereof to apply a circumferentially directed force to said drive transmitting members to move said drive transmitting members in said recesses from a non-drive transmitting position towards a drive transmitting position, wherein said drive transmitting members are wedging elements that wedge between said housing and driven member when in said drive transmitting position; said wedging elements each have a first side and a second side and in said circumferential direction increase in thickness between said first and second sides; and said force applying member comprises respective first engagement members engageable with the respective first sides of said wedging elements to apply said circumferentially directed force to said wedging elements.