Motors: expansible chamber type – With correlated control of motive fluid and locking means – Sequential operation of locking means and motive fluid control
Patent
1991-07-30
1992-11-17
Denion, Thomas E.
Motors: expansible chamber type
With correlated control of motive fluid and locking means
Sequential operation of locking means and motive fluid control
91 45, 91445, 91448, 92 28, 251 31, 251152, F15B 1526
Patent
active
051633515
ABSTRACT:
A hydraulic lock cylinder in which a cross bore is provided in an end structure of the cylinder housing which intersects the hydraulic fluid inlet passage to the central bore of the cylinder; a control piston is reciprocally mounted in the control bore; and pressurized fluid is admitted to the opposite ends of the control bore to shuttle the control piston within the control bore between a closed position in which the inlet passage is blocked and an open position in which the passage is open. The control piston includes a flat surface and a control port opening in the flat surface and an annular fitting screws into the inlet passage housing and includes a seal on its lower end for sealing coaction with the flat surface on the control piston to seal the inlet passsage. In one embodiment the lock mechanism is provided at the end of the cylinder housing through which the piston rod extends so that the hydraulic fluid trapped between the control piston and the adjacent end of the piston is resistant to a pulling force on the piston rod, and in another embodiment the lock mechanism is provided at the end of the cylinder housing remote from the end through which the piston rod extends so that the hydraulic fluid trapped between the control piston and the adjacent end of the piston is resistant to a pushing force on the piston rod.
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