Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent
1999-02-25
2000-09-05
Scherbel, David A.
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
192 8481, B25B 1300
Patent
active
061126241
ABSTRACT:
A rotary lever assembly for a wrench includes an elongated tubular coupler, which has a tongue of a polygonal cross-section that is adapted to engage fittingly a polygonal groove in a socket portion of a fastener-rotating element. A movable rod is mounted movably in the coupler, and is biased by a spring to an extended position, in which a ball projects partially from a hole in the tongue to engage a positioning cavity in the socket portion. In this way, the fastener-rotating element can rotate synchronously with the coupler of the rotary lever assembly. When the movable rod is pushed to a retracted position, a hole in the movable rod is aligned with the hole in the tongue. In this case, the socket portion can move on the tongue in view of the condition that the inner surface of the socket portion pushes the ball to retract entirely into the hole in the tongue. When the movable rod is released and is thus biased by the spring to move from the retracted position to the extended position, an inclined guide surface of the movable rod pushes the ball to project partially from the hole in the tongue.
REFERENCES:
patent: 4407175 (1983-10-01), Graham
patent: 5012705 (1991-05-01), Chow
patent: 5499559 (1996-03-01), Lin
patent: 5509331 (1996-04-01), Nickipuck
patent: 5941140 (1999-08-01), Suksi
patent: 5943924 (1999-08-01), Jarvis
Scherbel David A.
Shanley Daniel
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