Showing papers by "ICM Partners published in 1970"
Patent•
14 May 1970TL;DR: In this article, a hydraulic power circuit especially useful as a lift circuit for front-end loaders and including a bypass valve separate from the directional control valve is adapted to interconnect the contracting and expanding ends of the actuating cylinders.
Abstract: A hydraulic power circuit especially useful as a lift circuit for front-end loaders and including a bypass valve separate from the directional control valve which is adapted to interconnect the contracting and expanding ends of the actuating cylinders and permit rapid lowering of the implement. The circuit is characterized by an actuating scheme for the bypass valve which opens that valve only when the directional control valve is shifted to float position and the load pressure in the contracting ends of the cylinders is below a preselected value. The directional control valve may be shifted by pilot pressures, and in this case the motive force for opening the bypass valve may be developed by the pressure in the pilot circuit.
14 citations
Patent•
15 Jul 1970TL;DR: In this article, the authors describe the Hydraulic power circuit, which includes a switch-valve for the control system with a power pump and a pressure regulator for reducing the pressure of the fluid supplied by the power pump.
Abstract: HYDRAULIC POWER CIRCUIT INCLUDING A LIFT CYLINDER FOR RAISING A LOAD, AND A DIRECTIONAL CONTROL VALVE FOR THE CYLINDER WHICH IS ACTUATED BY A LOW PRESSURE REMOTE CONTROL SYSTEM. THE REMOTE CONTROL SYSTEM NORMALLY RECEIVES MOTIVE FLUID FROM A PUMP, BUT, WHEN THE PUMP IS DISABLED OR IDLE, THE CONTROLS MAY BE ADJUSTED TO EFFECT LOWERING OF AN ELEVATED LOAD UTILIZING THE FLUID UNDER LOAD PRESSURE IN THE CYLINDER. FOR THIS PURPOSE, THE CIRCUIT INCLUDES A SWITCH VALVE WHICH ALTERNATELY CONNECTS THE INLET CONDUIT OF THE REMOTE CONTROL SYSTEM WITH THE PUMP OR THE CYLINDER DEPENDING UPON WHETHER PUMP OUTPUT PRESSURE IS ABOVE OR BELOW A PREDETERMINED VALUE, AND A PRESSURE REGULATOR FOR REDUCING THE PRESSURE OF THE FLUID DELIVERED TO THE REMOTE CONTROL SYSTEM FROM THE CYLINDER. IN APPLICTIONS WHERE THE POWER PUMP FOR THE CYLINDER SERVES ALSO AS THE NORMAL SOURCE OF MOTIVE FLUID FOR THE REMOTE CONTROL SYSTEM, THE PRESSURE REGULATOR MAY BE ARRNAGED BETWEEN THE SWITCH VALVE AND THE REMOTE CONTROL SYSTEM SO THAT IT CAN SERVE TO REDUCE THE PRESSURE OF THE FLUID SUPPLIED TO THAT SYSTEM FROM EITHER THE POWER PUMP OR THE LIFT CYLINDER.
10 citations