Movable or removable closures – With means to vary opening span or speed during movement
Reexamination Certificate
2005-09-06
2005-09-06
Thompson, II, Hugh B. (Department: 3634)
Movable or removable closures
With means to vary opening span or speed during movement
C016S049000, C016S066000, C454S168000, C454S169000
Reexamination Certificate
active
06938372
ABSTRACT:
A mine door assembly has a frame. At least one door leaf is mounted on the frame for swinging movement between open and closed positions. Movement of the door leaf is powered by a pneumatic actuator. The door installation also has a hydraulic checking system for controlling the speed of the door leaf as it moves back and forth between open and closed positions. A pneumatically-powered control system may be provided to control the door installation. The pneumatic control system may comprise a calibrated vent to shorten the delay in the response of the door leaf to direction from the control system to stop moving. The pneumatic control system may also comprise a limit valve to prevent the door installation from opening when a second door installation is open, thereby preventing both door installations in an air lock from being open at the same time.
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Jack Kennedy Metal Products & Buildings, Inc., Kennedy Power Machine Doors brochure, Jul. 2, 2002.
Jack Kennedy Metal Products & Buildings, Inc., Form Transmittal Letter for Kennedy Power Machine Doors, Jul. 2, 2002.
The American Mine Door Company, Canton Doors . . . for Trucks . . . for Motors . . . Speed up haulage brochure, admitted prior art, no month & no date available.
Kennedy John M.
Kennedy William R.
Senniger Powers
Thompson II Hugh B.
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