SAFETY DEVICE FOR PREVENTING WORKING-APPARATUS OPERATION DURING REGENERATION OF FORKLIFT-TRUCK DIESEL-EXHAUST GAS AFTER-TREATMENT DEVICE
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United States of America Patent
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N/A
Issued Date -
Sep 17, 2015
app pub date -
Oct 8, 2013
filing date -
Oct 11, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A safety device, preventing working-apparatus operation during regeneration of a diesel-exhaust-gas after-treatment device, comprises: a hydraulic pump discharging high-pressure hydraulic fluid; a main control valve, with working-apparatus control valves, providing hydraulic fluid to a desired working apparatus among a plurality of working apparatuses; an adjustment control valve controlled to provide pilot hydraulic fluid to the working-apparatus control valves due to actuation of an actuation lever; a pressure-reducing valve effecting control such that high-pressure hydraulic oil from the hydraulic pump is reduced in pressure to the pressure of the pilot hydraulic fluid, and which supplies pressure-reduced hydraulic fluid to the adjustment control valve; and a control-valve unit, disposed upstream of the adjustment control valve, controlled to cut off supply of pressure-reduced hydraulic fluid to the adjustment control valve upon receiving a signal from the control unit, based on worker departure data when a worker leaves the driving seat during the regeneration.
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