Cutting – Means to drive or to guide tool – With simple oscillating motion only
Reexamination Certificate
2006-11-14
2006-11-14
Ashley, Boyer D. (Department: 3724)
Cutting
Means to drive or to guide tool
With simple oscillating motion only
C083S370000, C083S586000, C083S950000, C166S054500, C166S055200, C187S349000
Reexamination Certificate
active
07134374
ABSTRACT:
A safety cable cutter used for cutting a cable used in servicing an oil and gas well. A centrifugal arm roller and a guide roller are mounted on top of a frame. The cable is received on the rollers as the cable is lowered down a well bore. Mounted on ends of the centrifugal arm roller is a centrifugal arm attached to an arm coil spring. The coil spring holds the centrifugal arm next to the end of the roller. Opposite ends of a clamp attached to a cutter bar are slidably received in a pair of cutter bar guides. When the centrifugal arm roller exceeds a certain speed indicating a free fall of the cable, the bias force of the arm coil springs is overcome and the arms move outwardly. Contact ends of the arms engage the opposite ends of the clamp. The clamp and cutter bar are then moved outwardly and the cutter bar cuts the cable.
REFERENCES:
patent: 2495732 (1950-01-01), Jessen
patent: 3962943 (1976-06-01), Allen
patent: 4826103 (1989-05-01), McKown
patent: 5511311 (1996-04-01), Collins
patent: 6427334 (2002-08-01), Onion
patent: 6526858 (2003-03-01), Smith et al.
patent: 6684510 (2004-02-01), Collins
patent: 2003/0074739 (2003-04-01), Seber et al.
Williamson Alan M.
Williamson Cody
Ashley Boyer D.
Crabtree Edwin H.
Landrum Edward
Pizarro Ramon L.
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