Machine to apply a screwing or unscrewing torque

Details Machine to apply a screwing or unscrewing torque Machine to apply a screwing or unscrewing torque

1983-04-28

1985-10-08

Schran, Donald R.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5719, 81 5721, E21B 1916

Patent

active

045452695

ABSTRACT:
A machine to apply screwing and unscrewing torque to successive drilling shafts employs upper and lower claws, one of which is fixed and the other of which rotates through a limited angular range. Each claw comprises a pair of right-angle branches extending oppositely from a base and terminating in spaced relation to provide a permanent opening at one side of the claw opposite to the base. Each claw has a jaw comprising three gripping elements positioned essentially at the vertices of an equilateral triangle, one gripping element being fixed to the base and the other gripping elements being movably mounted on the branches at opposite sides of the opening. One claw comprises a pair of parts relatively movable vertically to form a viewing opening when the machine is not applying torque.

REFERENCES:
patent: 2453369 (1948-11-01), Grable et al.
patent: 2705614 (1955-04-01), McKibben et al.
patent: 3021739 (1962-02-01), Grundmann
patent: 3041901 (1962-07-01), Knights
patent: 3680412 (1972-08-01), Mayer et al.
patent: 3838613 (1974-10-01), Wilms
patent: 3902385 (1975-09-01), Haby
patent: 4023449 (1977-05-01), Boyadjieff
patent: 4082017 (1978-04-01), Eckel

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