Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1992-07-15
1993-12-21
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 572, 81 5734, B25B 1700
Patent
active
052712982
ABSTRACT:
A machine for screwing and unscrewing two rods comprises an annular carcass (11) forming a frame about a central axis (A) and, staggered in height on said carcass (11), upper and lower wrenches (12E, 12I) each adapted to grip two successive rods (13). One of said wrenches (12E), referred to hereinafter as the drive wrench, is mounted rotatably relative to the carcass (11) and said drive wrench (12E) at least comprises a plurality of cams (18) distributed circumferentially and each mounted to pivot about an axis (A') parallel to the central axis (A) between a retracted position in which they leave around said central axis (A) a space (19) sufficient for the rods (13) to pass through and a deployed position in which they intrude on said space (19) and are able conjointly to grip a rod (13) present in the latter. The machine is useful in drilling installations.
REFERENCES:
patent: 2263267 (1941-11-01), Franklin
patent: 3246547 (1966-04-01), O'Neill et al.
patent: 3540326 (1970-11-01), Dickmann et al.
patent: 4372026 (1983-02-01), Mosing
patent: 4485697 (1984-12-01), Heilhecker et al.
patent: 5067376 (1991-11-01), Fosella
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