| 摘要 |
A wrench, which includes a hollow three-way (or two-way) casing, a plurality of coupling shafts respectively mounted in the ends of the casing for holding a respective tool accessory, and a transmission mechanism coupled between the coupling shafts for enabling the coupling shafts to be rotated synchronously, wherein the transmission mechanism includes a plurality of transmission members respectively coupled to the coupling shafts inside the casing and meshed with one another, and a plurality of compression springs respectively mounted in the coupling shafts to force the transmission members into engagement with one another, the transmission members each having a rectangular shank at one end inserted into a rectangular coupling hole on the respective coupling shaft and supported on the corresponding compression spring, and a bevel gear at an opposite end meshed with the bevel gear at the transmission member in an adjacent coupling shaft.
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