| 摘要 |
The tool has a casing (10) and a pneumatic motor (11) with a cylinder (16) and work head (12,29). A piston (26) impacts the work head and also acts as a sliding valve. - The piston and cylinder have air ports and passages designed so that the motor is stationary until the work head is pressed against a workpiece (44). - This pressure moves the piston valve to admit compressed air. The piston delivers percussion blows to the work head.
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