| 摘要 |
An improved hammering structure of a pneumatic wrench is comprised of a hammering holder having its one end connected to a pneumatic motor via a threaded hole, and containing two chambers each to accommodate a hammer; a hetero-hole being provided in each hammer to be linked to the transmission shaft; a reinforced rib is provided between two linking ribs at the terminal of the transmission shaft to connect both linking ribs for improving rigidity of both linking ribs and eliminating over concentrated stress; a separation rib being provided in the hammering holder to separate both hammers for avoiding friction between two hammers, thus to upgrade rigidity of the hammering holder and extend its service life.
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