| 摘要 |
In the case of a screwdriver with at least one compressed-air channel for driving a compressed-air motor serving to screw in a screw or .... from the cooling device of another motor serving the same purpose, and at least one air intake channel to an axially displaceable guide sleeve which guides the screwing spindle, serves to hold the cap screw during the initial phase of the screwing process and has two screwing-in stages, a first ...... switching on the motor or the compressed air and thereby freeing the air intake channel .... a second ..... the engaging of a step-down gear system cooperating with the motor and thus freeing the actual drive of the screwing spindle when pushing in the guide sleeve until the thread of the screwing spindle is inserted into the screw slot or the like, and optionally with a torque limitation by means of a freewheel-locking mechanism or a slip clutch or a separating coupling, the improvement according to the invention consists in that the compressed-air channel with or without a surrounding space is functionally connected by a connecting channel of comparatively small diameter to the air intake channel with or without its surrounding space, on the other hand.
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