Ratchet wrench

Details Ratchet wrench Ratchet wrench

1995-10-06

1997-02-18

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

81 63, B25B 1346

Patent

active

056032471

ABSTRACT:
An improved ratchet wrench includes an upper plate, a lower plate, a base disposed between the upper plate and the lower plate, two ratchets, two trigger blocks, two springs and two baffle elements. Both the upper plate and the lower plate have at least a bent portion at one end thereof. The distance between a middle portion of the upper plate and a middle portion of the lower plate is smaller than the distance between an upper bent portion and a lower bent portion of the plates, such that the distance between the middle portions is equivalent to the distance between the bent portions of the upper and lower plates multiplied by a cosine of the angle of the bend. By such an arrangement, the upper plate and the lower plate are identical in shape and length, and hence manufacture of the ratchet wrench may be speeded up and costs reduced.

REFERENCES:
patent: 1127717 (1915-02-01), Ash
patent: 4748875 (1988-06-01), Lang
patent: 5119701 (1992-06-01), Wei
patent: 5199332 (1993-04-01), Batten
patent: 5325744 (1994-07-01), Horikawa

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