Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Reexamination Certificate
2006-01-31
2006-01-31
Look, Edward K. (Department: 3751)
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
C092S164000
Reexamination Certificate
active
06991210
ABSTRACT:
The purpose of this invention is to provide an actuator for valve driving without enlarging its size, without increasing the cost, and without reducing the pressure receiving area of the pistons. In order to achieve the purpose, the present invention comprises the left and right side cylinders supporting each of the piston to slide freely towards the center of the piston rod, and the first passageway that communicates the left side cylinder room of the left side cylinder with the left side cylinder room of the right side cylinder where both cylinders are separated by the pistons, and the second passageway that communicates the right side cylinder room of the left side cylinder with the right side cylinder room of the right side cylinder where both cylinders are separated by the pistons, and the converter that converts the piston rod's reciprocating motion towards the center of the rod into the rotating motion of the valve driving shaft, and thereby being characterized by having the first and second passageways in or around the supporting members of the left and right side cylinders.
REFERENCES:
patent: 3189700 (1965-06-01), Eidson
patent: 3452961 (1969-07-01), Forsman
patent: 4094231 (1978-06-01), Carr
patent: 5123334 (1992-06-01), van Loo
patent: 46-33656 (1971-10-01), None
patent: 49-8671 (1974-01-01), None
patent: 55-102405 (1980-07-01), None
patent: 62-114201 (1987-07-01), None
patent: 01-91079 (1989-06-01), None
patent: 02-107804 (1990-08-01), None
patent: 06-73405 (1994-10-01), None
Patent Abstracts of Japan for JP49-8671 published on Jan. 25, 1974.
Patent Abstracts of Japan for JP62-114201 published on Jul. 21, 1987.
Patent Abstracts of Japan for JP01-91079 published on Jun. 15, 1989.
Patent Abstracts of Japan for JP55-102405 published on Jul. 17, 1980.
Patent Abstracts of Japan for JP46-33656 published on Oct. 2, 1971.
Patent Abstracts of Japan for JP06-73405 published on Oct. 18, 1994.
Patent Abstracts of Japan for JP02-107804 published on Aug. 28, 1990.
Fristoe Jr. John K.
Look Edward K.
Tomoe Technical Research Company Ltd.
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