| 摘要 |
A rotary impact tool having a twin hammer mechanism that generally includes a housing having a hollow cage or carrier member positioned therein. A pair of hollow hammer members are pivotally positioned relative to the hollow cage or carrier member so the hollow hammer members rotate with the hollow cage or carrier member under drive from an air motor output shaft. An anvil is positioned inside the hollow hammer members and the anvil rotates relative to the hollow hammer members. The anvil preferably includes a forward anvil lug, a rearward anvil lug and an annular ring positioned intermediate the forward anvil lug, and the rearward anvil lug. To facilitate assembly of the anvil through the hollow hammer members, the annular ring could be a reduced diameter annular ring or the sides of a full diameter annular ring could be reduced or narrowed. Positive spacing of the hollow hammer members can be achieved by placing a spacer between the hollow hammer members. Alternatively, positive spacing of the hollow hammer members can be achieved by extending the hollow hammer members over the annular ring on the anvil with a step provided on the hollow hammer members to provide clearance for the annular ring on the anvil.
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