Valves and valve actuation – Fluid actuated or retarded – Fluid and non-fluid actuators
Reexamination Certificate
2009-02-04
2011-12-06
Fristoe, Jr., John (Department: 3753)
Valves and valve actuation
Fluid actuated or retarded
Fluid and non-fluid actuators
C251S062000
Reexamination Certificate
active
08070127
ABSTRACT:
Apparatus for manual override operation of a linear actuator are described. An example manual override apparatus includes a manual operator having a first coupling on a first side and a second coupling on a second side opposite the first side. A first drive member having external threads is coupled to a housing of an actuator. The first drive member includes a first end to removably receive the first coupling of the manual operator, a second end to selectively engage an actuation member of the actuator, and a bore therethrough along a longitudinal axis of the first drive member. A second drive member disposed in the bore to be rotatably coupled to the first drive member. The second drive member has a first end threadably coupled to an actuator stem of the actuation member and a second end to removably receive the second coupling of the manual operator. Rotation of the first drive member in a first rotational direction via the manual operator moves the actuation member of the actuator in a first linear direction and rotation of the second drive member relative to the first drive member in the first rotational direction via the manual operator causes the actuation member to move in a second linear direction opposite the first linear direction.
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Fisher Controls International LLC
Fristoe, Jr. John
Hanley Flight & Zimmerman LLC
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