Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical...
Patent
1983-12-27
1985-08-20
Novosad, Stephen J.
Boring or penetrating the earth
With tool drive prime mover or above-ground mechanical...
175218, 166332, 251340, E21B 2110, E21B 3416, F16K 3100
Patent
active
045358524
ABSTRACT:
An actuator for opening and closing a valve connected into a tubular element at the upper end of a drill string, to close off the flow of fluid through the element, and including a sleeve about the tubular element movable upwardly and downwardly relative thereto and mechanism carried by the sleeve for pivoting a valve actuating member to open and close the valve upon upward and downward movement of the sleeve. The specified mechanism preferably includes a part which interfits with the valve actuating member in a manner pivoting it upon upward and downward movement of the sleeve, but which desirably moves out of that interfitting relation in the extreme upper and lower positions of the sleeve to enable manual actuation of the valve in those positions without interference by the actuating mechanism. The apparatus also may be operable to yieldingly urge the pivoting valve actuating member as far as it can turn in the fully opened and fully closed positions of the valve in order to always assure complete opening or closing of the valve even when some of the parts may have become worn.
REFERENCES:
patent: 3507192 (1970-04-01), Stokke
patent: 3877529 (1975-04-01), Litchfield
patent: 3887161 (1975-06-01), Kubelka, Jr.
patent: 3915244 (1975-10-01), Brown
patent: 3941348 (1976-03-01), Mott
patent: 4170169 (1979-10-01), Shafer
patent: 4417600 (1983-11-01), Kohn
patent: 4421171 (1983-12-01), Haynes
patent: 4456217 (1984-06-01), Winegeart et al.
Hydril, "Kelleyguard", bulletin 6506.
International Tool Company, advertising sheet, p. 3515.
Varco, drawing #71840.
Boyadjieff George I.
Krasnov Igor
Green William P.
Kisliuk Bruce M.
Novosad Stephen J.
Varco International, Inc.
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