| 摘要 |
A ratchet wrench (20) includes a handle-carried drive ring (38), and a driven core (34) which can be simply and readily removed, intact, for cleaning, repair and replacement without the use of tools. Additionally, the wrench (20) includes a low-friction ratchet drive-reversing mechanism for simple one-finger operation. The disassembly-facilitating structure includes a resilient ring-like band (190) seated in a channel (192) defined by radially communicating annular grooves (180, 184) in the drive ring (38) and in the wrench core (34). A band displacing element (222) serves to shift the band (190) to effect a bridging of the band (190) across the grooves (180, 184) to effect a mechanical intercoupling between the core (34) and the drive ring (38) For disassembly, the band (190) is repositioned to assume a configuration occupying a single one only of the communicating grooves (180, 184) thereby uncoupling the core (34) and the drive ring (38), to permit withdrawal of the core (34) as an intact unit. The drive direction of the wrench (20) is controlled by an arcuate wire spring (104) which intercouples a finger-manipulable pivotal drive-reversing control plate (60) of the tool with a shiftable pawl (46) housed in the core (34) of the wrench (20) to provide a low-friction mechanism by which the pawl (46) is positioned to establish a selectable drive direction of the wrench (20) through simple one-finger displacement of the reversing plate (60). |
