Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1979-10-01
1981-09-15
Jones, Jr., James L.
Tools
Wrench, screwdriver, or driver therefor
Machine
B25B 1700
Patent
active
042890497
ABSTRACT:
An improved power tool is utilized to tighten a connection between internally and externally threaded fastener elements. The power tool includes a motor which drives a socket which engages the internally threaded fastener element, such as a nut. A retainer rod extends through a central passage in a socket drive member to engage an exposed end of an externally threaded member, such as a bolt. An assembly is provided to hold the retainer rod against rotation with the socket and to apply an axially directed force to the retainer rod to urge it into engagement with the bolt. This assembly includes a piston which is releasably connected with the retainer rod and is spring biased toward one end of a chamber. As the nut is tightened onto the bolt, the piston is retracted into the chamber against the influence of the spring. The connection which secures the piston to the retainer rod is releasable to enable the retainer rod to be moved axially relative to the piston to vary the extent to which it projects into the socket. The piston and piston chamber have polygonal cross sectional configurations so that the side surfaces of the chamber hold the piston and retainer rod against rotational movement relative to the casing of the power tool.
REFERENCES:
patent: 2789597 (1957-04-01), La Torre
patent: 2882773 (1959-04-01), Wing
patent: 2955496 (1960-10-01), La Torre
patent: 3247741 (1966-04-01), Batten
patent: 3323394 (1967-06-01), Bangerten et al.
patent: 3323395 (1967-06-01), Burnett et al.
patent: 3394623 (1968-07-01), Kinakin
patent: 3584527 (1971-06-01), Bosten
patent: 3916734 (1975-11-01), Sawan
patent: 4165660 (1979-08-01), Behrens
Jones Jr. James L.
The Lamson & Sessions Co.
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