Transmission system capable of driving right and left drive whee

Details Transmission system capable of driving right and left drive whee Transmission system capable of driving right and left drive whee

1992-04-08

1993-09-28

Bagnell, David J.

Harvesters

Motorized harvester

With selective control of drive means

56 111, 180 648, A01D 3468, B62D 1104

Patent

active

052477843

ABSTRACT:
A walking operator type lawn mower having stepless transmissions allocated to right and left rear wheels for changing speed of engine drive and outputting the drive to the right and left rear wheels, respectively, whereby the right and left rear wheels may be driven at different speeds. Right and left control members operable by a speed control lever frictionally fixable to a selected position are interlocked to change speed arms through springs, respectively. The change speed arms are pivotable, following operation of the shift levers, for controlling change speed rates of the stepless transmissions. The change speed arms are also operable by a pair of right and left auxiliary levers to move toward a backward drive position regardless of speed setting position of the speed control lever. A constant speed straight cruising run is obtained by retaining the speed control lever in a selected position to operate the change speed arms of the right and left transmissions substantially the same amount. In this state, one of the right and left auxiliary levers may be operated to shift the corresponding change speed arm from the selected speed position to a different speed position, e.g. to a lower speed position or to a backward drive position, thereby realizing a desired turning mode.

REFERENCES:
patent: 4031975 (1977-06-01), Engel
patent: 4809796 (1989-03-01), Yamaoka et al.
patent: 4934989 (1990-06-01), Furukawa et al.
patent: 5077959 (1992-01-01), Wenzel
patent: 5181579 (1993-01-01), Gilliem

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