B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
187/13
B66B 1/00 (2006.01) B66B 1/36 (2006.01) B66B 17/34 (2006.01)
Patent
CA 1044617
ABSTRACT OF THE DISCLOSURE 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. - 1 -
262382
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