Hydraulic stop valve for a camera crane
AssigneeChapman/Leonard Studio Equipment, Inc.
InventorsLeonard T. CHAPMAN, Robert STAWINSKI
Life of this patent
Estimating the term…
Abstract
A stop valve for a camera support such as a telescoping camera crane may include a valve pin engagable onto a valve seat, with a pin plate attached to the valve pin. A spring urges the valve pin in a first direction, which may be an opening direction or a closing direction. First and second dampener pins in first and second cylinders are attached to the pin plate. A closed loop fluid filled flow path connects the first and second cylinders. First and second check valves may be used to control flow in the flow path.
Claims18
A camera support, comprising:
- an arm;
- a hydraulic system including:
- a hydraulic fluid reservoir;
- a source of hydraulic fluid under pressure;
- at least one hydraulic actuator connected directly or indirectly to the arm, for moving the arm;
- a control valve connected via hydraulic lines to the source and to the hydraulic actuator;
- and
- a stop valve in the hydraulic system, with the stop valve including:
- a valve pin engagable onto a valve seat;
- a pin plate attached to the valve pin;
- a spring urging the valve pin in a first direction;
- first and second dampener pins in first and second cylinders, with the first and second dampener pins attached to the pin plate;
- and
- a closed loop fluid filled flow path connecting the first and second cylinders.
A hydraulic stop valve comprising:
- a valve pin engagable onto a valve seat;
- a spring urging the valve pin in a first direction;
- a solenoid having a piston positioned to move the valve pin in a second direction opposite from the first direction;
- a pin plate attached to the valve pin;
- first and second dampener pins in first and second cylinders, with the first and second dampener pins attached to the pin plate;
- each cylinder having a first port and a second port, and each dampener pin having a flange between a first port and a second port:
- a first flow path connecting the first ports of the first and second cylinders;
- a second flow path connecting the second ports of the first and second cylinders;
- a first check valve connecting the first and second flow paths and allowing flow only from the first flow path into the second flow path:
- and
- a second check valve connecting the first and second flow paths and allowing flow only from the second flow path into the first flow path.
A camera support, comprising:
- an arm;
- a hydraulic system including:
- at least one hydraulic actuator connected directly or indirectly to the arm, for moving the arm;
- a control valve connected via a hydraulic line to the hydraulic actuator;
- and
- a stop valve in the hydraulic system connected via a hydraulic line to the control valve.
Dependencies are inferred from the claim text.