Elongated-member-driving apparatus – With interlock means
Patent
1981-04-30
1984-05-22
Bell, Paul A.
Elongated-member-driving apparatus
With interlock means
227131, 227 90, B25C 106
Patent
active
044496605
ABSTRACT:
A fastener tool having a housing in which is mounted a universal motor to be continuously operated during operation of the tool. A gear driven by the motor is a rotary driven member. A drive pin is carried by the gear to rotate therewith and is free to be shifted axially relative the gear. A drive bar is mounted in the housing to drive fasteners. The drive pin is connectable to the drive bar to produce a power stroke and a return stroke. An interrupt mechanism is operative to prevent successive power strokes, and in the preferred embodiment it will include the drive pin; it will act to disconnect the drive pin from the drive bar. Also the interrupt mechanism will control the connection of the drive pin and drive bar. The maximum number of power strokes are one-half the number of rotary cycles of the rotary driven member. The interrupt mechanism includes a linkage for sensing workpiece engagement and operator actuation of the tool, each of which are required to produce a single power stroke. The interrupt mechanism may also include a track and shifter to axially shift the drive pin. The drive bar has a slot which in a start position is aligned to receive or release the pin during a predetermined 45.degree. arc of gear rotation. A detent will yieldly hold the drive bar in the start position.
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patent: 4323127 (1982-04-01), Cunningham
Bell Paul A.
Black & Decker Inc.
Sherer Ronald B.
Weinstein Harold
Yocum Charles E.
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