Power plants – Pressure fluid source and motor – Methods of operation
Patent
1976-10-04
1978-02-28
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Methods of operation
60478, 91442, 251 48, 251120, F15B 1522
Patent
active
040758397
ABSTRACT:
Means for controlling the decompression of a pressure chamber, such as an actuating pressure chamber of mine cage holding apparatus, including an outlet passage adapted to communicate with the interior of the pressure chamber; a valve seat associated with the outlet passage; a movable valve member movable into and out of engagement with the seat, the valve member or a part movable therewith being adapted to obstruct the outlet passage during at least part of the travel of the valve member away from the seat with a resistance to the release of pressure from the pressure chamber which decreases with increasing displacement from the seat; a control fluid chamber; a control piston movable in the control chamber and adapted to urge the valve member towards engagement with its seat under the influence of fluid pressure in the control chamber; and a vent from the control chamber through which fluid can escape.
REFERENCES:
patent: 2573993 (1951-11-01), Sedgwick
patent: 2938346 (1960-05-01), Gratzmuller
patent: 3853300 (1974-12-01), Bryntse et al.
patent: 3991570 (1976-11-01), Keller
Geoghegan Edgar W.
Patent Products Hydraulics (Proprietary) Limited
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