| 摘要 |
A cam-action ratchet-type wrench has a handle with a hand grip portion at one end and a generally cylindrical head portion at the opposite end. A cylindrical torque transmitting member rotatably disposed within the head portion has an outwardly extending portion for connection to a socket for rotating a workpiece. A pair of cam wedge members movably disposed in laterally opposed spaced relation within rectangular slots in the head portion have inwardly facing curved surfaces. A direction selection disk rotatably mounted in the head portion above the torque transmitting member has a pin disposed between the cam wedge members. A direction selection lever on the handle rotates the direction selection disk to selectively engage the pin with one of the pair of cam wedge members to move the curved surface of the engaged cam wedge member into and out of engagement with the cylindrical surface of the torque transmitting member. The cam wedge members can be moved from a locked position wherein the handle, the torque transmitting member, and head portion rotate together as a single unit in both a clockwise and counterclockwise direction to an engaged position wherein one cam wedge member is disengaged from the torque transmitting member and upon rotation of the handle, the opposed cam wedge member becomes wedged between the slot and the torque transmitting member to cause the handle, torque transmitting member, and head portion to rotate together as a single unit in one direction only while allowing free relative rotational movement in the opposite direction.
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