Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1988-01-20
1989-08-08
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5744, 81 591, B25B 1346
Patent
active
048541974
ABSTRACT:
The double-acting piston of a torque wrench has a piston rod, the free end of which receives a pin which is guided at each end in straight or curved guide channels in the wrench housing. The pin passes through drive shoes which are slidably received in slots at the upper end of a drive lever. As it reciprocates, the driver lever rotates a ratchet wheel, the ratchet wheel having a square central bore to receive a square drive shaft journaled in the housing. If the constant force is applied, the torque wrench provides a substantially constant torque, particularly if the guide channels are curved to compensate for frictional losses. The ratchet mechanism includes rollers which float between grooves in the ratchet wheel and sockets in the drive lever.
REFERENCES:
patent: 2482387 (1949-09-01), Veneman
patent: 3438451 (1969-04-01), Hayes, Jr.
patent: 3620105 (1971-11-01), Batten
patent: 4027561 (1977-06-01), Junkers
patent: 4201099 (1980-05-01), Junkers
patent: 4275620 (1981-06-01), Collins
patent: 4336727 (1982-06-01), Junkers
patent: 4339968 (1982-07-01), Krieger
patent: 4346630 (1982-08-01), Hanson
patent: 4524651 (1985-06-01), Dubiel et al.
patent: 4669338 (1987-06-01), Collins
patent: 4674368 (1987-06-01), Surowiecki
patent: 4706527 (1987-11-01), Junkers
patent: 4744271 (1988-05-01), Collins
Hedley Purvis Limited
Rachuda Maurina
Schmidt Frederick R.
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