| 摘要 |
In an explosive powder actuated setting device, a driving piston (8) is displaceable between a ready-to-fire position and a fired position within a barrel (12) formed by a piston guide (5). When the piston is driven from the ready-to-fire position into the fired position, it is held by braking balls (17) supported in recesses (16) in the piston guide. As it moves into the fired position, the piston moves the braking balls into the range of a spring (18) which biases the balls inwardly against the shank (11) of the piston (8). When the piston is returned into the ready-to-fire position, the balls move out of the range of the spring releasing the biasing force acting on the piston shank via the balls.
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