Power wrench

Tools – Wrench – screwdriver – or driver therefor – Machine

Patent

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Details

81 5713, B25B 2900

Patent

active

041799550

ABSTRACT:
A power wrench, or clamping tool, for tightening a bolt, nut and the like comprising a power shaft engaging the bolt, nut and the like, a driving power source of electromotive, pneumatic or hydraulic type, an anti-reaction force member for the prevention of rotation of the tool case due to the reaction force, a harmonic drive mechanism as the speed reduction mechanism between the power shaft and the driving power source, planetary gear device provided between the harmonic drive mechanism and the power shaft, a first mechanism engaged with a nut screwed to a torque set bolt and rotating the nut with the rotation of the power shaft thereby tightening the nut, a second mechanism engaged to the torque set bolt in such a way as to break the torque set bolt at a predetermined position when the tightening torque arrives at a predetermined value in the course of the clamping and a knock out mechanism which discharges the broken piece of the torque set bolt out of the case by means of a spring force. The tool case rotates with respect to a handle under relatively high frictional restraint to prevent the handle from rotation during the breakage or failure of the anti-reaction force member, and the anti-reaction force member is rotatable freely to a limited degree with respect to the tool case for locating the anti-reaction force member in contact with an adjacent nut and bolt to the nut being torqued down by the power wrench.

REFERENCES:
patent: 1326627 (1919-12-01), Young
patent: 1386455 (1921-08-01), Clemens
patent: 1970179 (1934-08-01), Miller
patent: 2606472 (1952-08-01), Curtis et al.
patent: 2820382 (1958-01-01), Smith
patent: 3041902 (1962-07-01), Wing
patent: 3222954 (1965-12-01), Wuertz
patent: 3331269 (1967-07-01), Sauter
patent: 3604292 (1971-09-01), Sada
patent: 4003274 (1977-01-01), Hirtsiefer
Harmonic Drive (pp. 11 & 12), 1962, United Shoe Machinery.

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