Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1975-11-19
1977-06-07
Jones, Jr., James L.
Tools
Wrench, screwdriver, or driver therefor
Machine
B25B 1346
Patent
active
040275612
ABSTRACT:
A hydraulically operated wrench for tightening and loosening threaded connectors, such as nuts and bolts, includes a shaft and a socket removably mounted on one end of the shaft for engaging a polygonal portion of a threaded connector which has to be tightened or loosened. The shaft carries a ratchet wheel for rotation therewith which is operated by a ratchet pawl pivotally mounted intermediate the ends of a first lever, one end of which is pivotally mounted on the shaft. A second lever is pivotally mounted on one end on the shaft, whereas a cylinder-and-piston unit is pivotally connected at opposite ends to the other ends of the first and second lever so that during reciprocation of the piston in the cylinder the shaft and the socket are rotated to tighten or loosen the threaded connector engaged by the socket. Such action will tend to swing the frame composed of the two levers and the cylinder-and-piston unit about the shaft axis in a direction opposite to the direction of rotation of the shaft, and the apparatus is provided with means to prevent such movement of the frame.
REFERENCES:
patent: 1812816 (1931-06-01), Weaver
patent: 3575069 (1971-04-01), White
patent: 3706244 (1972-12-01), Wilmeth
patent: 3745858 (1973-07-01), Biach
patent: 3930776 (1976-01-01), Keller
Jones Jr. James L.
Striker Michael J.
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