Ratchet wrench

Details Ratchet wrench Ratchet wrench

1986-04-07

1987-04-14

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 581, B25B 1300

Patent

active

046568948

ABSTRACT:
A ratchet wrench has a chain drive and three separate operating handles enabling the wrench to be operated in three different modes providing various degrees of torque and various speed ratios.

REFERENCES:
patent: 2292391 (1942-08-01), Merriman
patent: 3019681 (1962-02-01), Grissom

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