Power torque wrench

Details Power torque wrench Power torque wrench

1974-11-29

1976-02-24

Abbott, Frank L.

Tool driving or impacting

Means to drive tool about an axis

Means to hold and relatively rotate sections of tool shaft

81 5711, 81 524R, B25B 2100

Patent

active

039399249

ABSTRACT:
A torque wrench adapted to applying predetermined maximum torque onto related work comprising an elongate lever arm, a work engaging ratchet head including a body coupled to one end of the arm and adapted to be rotated by the arm, a spindle with a work engaging projection rotatable in the body and ratchet means between the spindle and body to establish driving engagement therebetween when the body is rotated in one direction by the arm, a manually controlled prime mover carried by the wrench in substantially fixed position relative to the body and transmission means between the prime mover and the spindle, said prime mover and transmission operable to selectively rotate the spindle in said one direction and in overriding relationship to the ratchet means, the torque delivered to the spindle by the prime mover being less than the predetermined maximum torque to be applied by the wrench on to related work.

REFERENCES:
patent: 2740507 (1956-04-01), Shaff
patent: 2740508 (1956-04-01), Shaff
patent: 2808749 (1957-10-01), Lampke
patent: 3733935 (1973-05-01), Tsuji

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