Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1975-09-22
1978-07-11
Jones, Jr., James L.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5714, 81 572, 166 78, B25B 1352
Patent
active
040994295
ABSTRACT:
According to the present apparatus and method, a silent chain having an inversely-bent internal portion is caused to be in direct pressure engagement with the external cylindrical surface of a drill pipe or other object to be spun. The chain is mounted on at least five sprocket wheels, one of which is a drive wheel adapted to rotate about a movable axis which may be locked in any desired adjusted position. The pressure between chain and pipe is caused to be sufficient to spin the pipe but insufficient to injure the pipe or prevent relative sliding movement when the joint is completed. A spring is provided to absorb shock on completion of the joint, and to cooperate with the relative sliding movement in preventing injury to the apparatus or to any user thereof. The chain is caused to encompass a very large section of the diameter of the pipe, regardless of variations in pipe diameter. At least for some sizes of pipe, the pivot points of the apparatus are so arranged that the chain tension operates to maintain the jaws closed instead of attempting to open the same, whereby to minimize the possibility of the tool "climbing off" the pipe. A pneumatic circuit is provided to insure that adequate pipe-engaging pressure is maintained despite loss of air pressure due to operation of a pneumatic spinning motor.
REFERENCES:
patent: 1639710 (1927-08-01), Stowell
patent: 2353642 (1944-07-01), Buice
patent: 2784626 (1957-03-01), Paget
patent: 2862690 (1958-12-01), Mason
Gausewitz Richard L.
Jones Jr. James L.
Service Equipment Design Co., Inc.
Smith James G.
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