Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1992-08-31
1993-11-16
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
74531, F16H 5902, G05G 516, G05G 503
Patent
active
052612902
ABSTRACT:
A control lever system for actuating the hydraulic pump of a hydrostatic transmission system of an agricultural vehicle includes a lever having a hand grip portion for actuation by the operator. The lever passes through an elongate slot in a console surface to control its movement. A lower end of the lever is connected to the pump. A friction resistance system is applied to the lever to generate a frictional force resisting the natural restoring force of the pump tending to move to the neutral postion. The friction resistance is applied only over the length of the slot relating to the forward movement of the pump so that there is no action at the neutral position or in reverse. The friction resistance includes a friction multiplier generated by a sub-lever portion pivotally mounted on the lever and biased by spring action when in contact with an abutment member to pinch a friction band so that the friction force generated by the band is greater than the spring action. The lever is shaped by an offset and by the inclination of the hand grip portion so that when pushed or pulled to move the lever from a set position the frictional resistance is reduced during movement and then automatically reapplied when the lever is released.
REFERENCES:
patent: 3837235 (1974-09-01), Peterson
patent: 4116086 (1978-09-01), Langford et al.
patent: 4297909 (1981-11-01), Crouse
patent: 4346618 (1982-08-01), Sakamoto et al.
Bergman Leonard
Fox Thomas R.
Ramsay Lawrence A.
Ade Stanley G.
Battison Adrian D.
Herrmann Allan D.
MacDon Industries Ltd.
Thrift Murray E.
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