Handling: hand and hoist-line implements – Hoist-line slings – Latch release
Patent
1978-12-26
1981-03-03
Cohen, Irwin C.
Handling: hand and hoist-line implements
Hoist-line slings
Latch release
91415, 91442, B66C 316, E21B 2700
Patent
active
042536928
ABSTRACT:
A control system for opening and closing the clam shell gates of a material placement bucket makes use of a selfcompensating back pressure fluid system with a double-acting cylinder and piston. An air receiver is filled with high pressure air while air at the same pressure is being applied to the piston in a gate opening direction. At the same time, air from the receiver flowing through a pressure regulator and simultaneous exhaust valve at a reduced pressure is applied to the opposite, or reversing, side of the piston, creating back pressure. Hence the differential pressure applicable in the forward acting direction is the gate opening pressure. Closing pressure is the reduced pressure which becomes effective when pressure on the opening side is diverted to exhaust. Speed of closing the gates can be increased by adjusting only the pressure regulator to supply a higher reduced pressure. The exhausting side of the simultaneous exhaust valve standing temporarily in closed position assures a closed system on the opposite or reversing side of the piston while the system is in a gate closing cycle.
REFERENCES:
patent: 2856222 (1958-10-01), Gossett et al.
patent: 3093153 (1963-06-01), Horowitz
patent: 3162097 (1964-12-01), Allen et al.
patent: 3791690 (1974-02-01), Garlinghouse
patent: 3850082 (1974-11-01), Nussbaumer
Beehler Vernon D.
Cohen Irwin C.
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