Mono stick assembly with adjustable creep control

Motor vehicles – Manually actuated controlling devices – Multiple vehicle functions controllable by single device

Patent

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Details

180 648, B60K 4100, G05G 904

Patent

active

043219802

ABSTRACT:
A hydraulic control system is disclosed for a hydrostatically operated earth-working machine which controls ground speed, forward and reverse movement, steering, and braking, for the machine. The hydraulic control system includes an improved mono stick assembly having a manually operable handle assembly mounted within a resilient pivot bushing that permits pivotal movement of the handle assembly in any direction. The pivotal movement of the handle assembly is transmitted to a control rod assembly which is mounted to a universal pivot joint that permits both longitudinal sliding movement and lateral pivotal movement of the rod assembly in response to selective pivotal movement of the handle assembly. Cable assemblies are mounted between the rod assembly and the hydraulic propulsion pump and steering valve. The rod assembly is movable longitudinally in response to selective pivotal movement of the handle assembly in a first direction thereby actuating the propulsion pump for controlling forward and reverse movement and ground speed of the machine. Pivotal movement of the handle assembly in a second direction transverse to the first direction causes the rod assembly to pivot laterally about the universal pivot joint to thereby actuate the steering valve. The present invention further includes an adjustable creep control assembly which can be selectively set independently of the mono stick assembly during high load, low machine speed conditions, thereby releasing the operator from constantly manipulating the mono stick control during such conditions. The mono stick assembly includes a locking mechanism for selectively holding the handle assembly in a fixed neutral position while the adjustable creep control assembly is being used to independently actuate the propulsion pump.

REFERENCES:
patent: 3590934 (1971-07-01), Wappler
patent: 3677362 (1972-07-01), Chatterjea
patent: 3768328 (1973-10-01), Campbell
patent: 3891042 (1975-06-01), Braun
patent: 3892286 (1975-07-01), Clevenger, Jr. et al.
patent: 4206602 (1980-06-01), Watson et al.

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