| 摘要 |
Ratchet wrenches are provided that allow for drive on both the forward and return strokes of the ratchet handle. A combination ring gear, sun gear and planetary gear system is used in combination with a drive pawl arrangement to achieve power drive in both directions of operation, regardless of whether a tightening or loosening operation is desired. Accelerated speed of operation is attained upon the return stroke as a function of gear sizing. In other embodiments, the planetary gear system is replaced with an intermediate gear assembly external to any interengaging both a drive and driven gear. In other embodiments, the planetary gear system is replaced with an intermediate gear assembly external to and interengaging both a drive and driven gear.
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