| 摘要 |
This invention pertains to a rotary impact tool and a clutch therefor, wherein a motor drives a cage member within which is pivotally mounted a swinging hollow hammer member. An output shaft extends through the cage member and through the hollow hammer member and includes forward and reverse impact anvil surfaces. The hammer member is mounted to swing in respect to the cage as it rotates with the cage, and it carries forward and reverse impact jaws on its internal surface. As the clutch is driven in the forward direction by an air motor or the like, the forward impact jaw is moved in and out of the path of the anvil jaw on the output shaft by cam action and during an impact blow the inertia of the rotating hammer member acts as automatic means to hold the impact jaw in engagement with the anvil jaw. A second embodiment includes a pair of hammers arranged to simultaneously strike a pair of anvil jaws on the anvil.
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