Handling: hand and hoist-line implements – Hoistable receptacle – With discharge or loading means
Patent
1981-08-28
1984-02-21
Cherry, Johnny D.
Handling: hand and hoist-line implements
Hoistable receptacle
With discharge or loading means
60413, 91417R, 294 88, B66C 316, F15B 1517
Patent
active
044325789
ABSTRACT:
A placement bucket for placing material such as concrete in forms by manipulation of clam shell gates in response to action of a power cylinder makes use of a hydraulic fluid system which prevents opening the gates of a full or partially full bucket of material unless there is a sufficient reserve of pressure and fluid volume to make certain of closing the gates at any time. The system is provided with a precharged fluid supply under pressure into which additional fluid is diverted when generated in a master cylinder by lifting a piston against the weight of the bucket and its contents. A sequence valve prevents flow of fluid to the power cylinder until an optimum amount of fluid pressure and volume is reached. An auxiliary direction valve in a fluid return line can be manipulated to temporarily block return flow of fluid from the exhaust side of the power cylinder to a reservoir, in that way to temporarily fix the partially or full open position of the gates.
REFERENCES:
patent: 2217283 (1940-10-01), Lorrin
patent: 2812970 (1957-11-01), Martinson
patent: 2856222 (1958-10-01), Gossett et al.
patent: 3104125 (1963-09-01), Garlinghouse
patent: 3791690 (1974-02-01), Garlinghouse
patent: 4161135 (1979-07-01), Garlinghouse
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