Use of fluid dynamic restrictor for lowering dump truck beds

Details Use of fluid dynamic restrictor for lowering dump truck beds Use of fluid dynamic restrictor for lowering dump truck beds

1990-01-23

1991-06-04

Spar, Robert J.

Land vehicles: dumping

Tilting

Operating mechanism

298 22C, B60P 128

Patent

active

050208578

ABSTRACT:
A fluid dynamic restrictor limits the speed at which the bed of a dump truck can be lowered by discharging fluid from a lift cylinder. The fluid dynamic restrictor defines a fluid vortex that provides a pressure drop proportional to the square of the fluid flow rate. Therefore the maximum rate at which the bed can be lowered is much the same regardless of whether the bed is empty or full. In contrast to a restrictor in the form of a throttled valve or wire mesh, the fluid dynamic restrictor is not easily plugged by debris. The fluid dynamic restrictor also offers little resistance in its reverse direction, which facilitates rapid lifting of the bed.

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