Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1978-08-01
1979-12-25
Jones, Jr., James L.
Tools
Wrench, screwdriver, or driver therefor
Machine
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.
Akiyoshi Toshio
Haikawa Shozo
Onishi Tsutomu
Jones Jr. James L.
Kabushiki Kaisha Terauchi Seisakusho
Mitsubishi Denki & Kabushiki Kaisha
LandOfFree
Power wrench does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power wrench, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power wrench will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2066277