Elongated-member-driving apparatus – With interlock means
Patent
1992-12-29
1993-11-23
Smith, Scott
Elongated-member-driving apparatus
With interlock means
227142, B25C 108
Patent
active
052636267
ABSTRACT:
In a fastener-driving tool comprising a housing structure defining an axis and a nosepiece extending from the housing structure, a primary actuating structure is movable between a tool-disabling position and a tool-enabling position, and a secondary actuating structure is coactive with the primary actuating structure for moving the primary actuating structure to the tool-enabling position when the secondary actuating structure is pressed firmly against a workpiece. The primary actuating structure is biased to the tool-disabling position by a primary spring or springs. The secondary actuating structure is biased away from the primary actuating structure by secondary springs. When the secondary actuating structure is pressed firmly against a workpiece, the primary spring or springs exhibit a biasing force less than the biasing force exhibited by the secondary springs. The secondary actuating structure may also be biased away from the housing structure by a tertiary spring.
REFERENCES:
patent: 3612379 (1971-10-01), Panock
patent: 4523646 (1985-06-01), Doyle et al.
patent: 4549681 (1985-10-01), Yamamoto et al.
patent: 4821937 (1989-04-01), Rafferty
patent: 5197646 (1993-03-01), Nikolich
Berry Robert J.
Howard Frank C.
Illinois Tool Works Inc.
Smith Scott
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