Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1975-02-06
1976-07-13
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
92 122, G05G 900
Patent
active
039687066
ABSTRACT:
A two-speed control for dual hydrostatic motors, especially for self-propelled, skid-steered loaders having hydrostatic transmissions. Each motor has a rotating piston group and a swash plate inclinable in either of two positions of piston displacement for low or high speed output. A shift lever connects the swash plate control arms of the motors with a manual selector lever biased by an over-center spring mechanism to either the high or low speed position. The shift lever has a slide and guide connection with one swash plate control arm and pivotally connects to the other in an arrangement which automatically locks the swash plates in the proper attitude in either shifted position of the slide and guide connection corresponding to the low or high speed range.
Two variable displacement hydrostatic pumps, one associated with each motor, are independently controlled by a pair of control levers operable to vary the pump displacement within both the high and low speed ranges of the motors.
REFERENCES:
patent: 2205651 (1940-06-01), Hoffman et al.
patent: 2460693 (1949-02-01), Hall
patent: 3065700 (1962-11-01), Blenkle
patent: 3776325 (1973-12-01), Jespersen
Clark Equipment Company
Herrmann Allan D.
Thibault Harry G.
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