Pressure activated placement bucket

Details Pressure activated placement bucket Pressure activated placement bucket

E - Fixed Constructions

02

D

294/32

E02D 15/02 (2006.01)

Patent

CA 1123874

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 reservois, in that way to temporarily fix the partially or full open position of the gates.

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