Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1987-08-19
1988-10-11
Spar, Robert J.
Material or article handling
Vertically swinging load support
Shovel or fork type
414697, B66C 2300, B66F 900
Patent
active
047767510
ABSTRACT:
A crowd control system for a hydraulic loader having three hydraulic pressure sensing switches that are electrically coupled to an electronic controller for overriding the operators commands and decreasing forward driving force when excessive crowding force is detected. The first switch is fluidically coupled to the output side of the hydraulic lifting pump. The second switch is fluidically coupled to the output side of the hydraulic lifting pump. The third switch is fluidically coupled to the extension input side of the boom-lift hydraulic actuator. When hydraulic fluid pressure exceeds the preset levels of each switch, the switches signal the electronic controller which overrides the operators controls and decreases the fluid output of the driving pump reducing the forward drive of the loader and decreasing crowd. The controller will maintain this decreased fluid output of the driving pump until either the second or third pressure sensing switch senses a decrease in fluid pressure below its preset level.
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Deere & Company
Doyle Jennifer L.
Spar Robert J.
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