Dual hydrostatic drive walk-behind mower

Details Dual hydrostatic drive walk-behind mower Dual hydrostatic drive walk-behind mower

1990-09-06

1992-07-07

Bagnell, David J.

Harvesters

Motorized harvester

With selective control of drive means

56 113, 56 115, 180 632, 180 191, A01D 3468

Patent

active

051272156

ABSTRACT:
An extra-wide self-propelled lawn mower employs twin hydrostatic transmissions to power the left and right rear drive wheels that are situated behind a forward moving deck. Hydrostatic drives have infinitely variable adjustment speed from reverse through neutral, to a maximum forward speed. There are also independent left and right control levers mounted adjacent the hand grips that are coupled through linkages to control levers for the respective hydrostatic transmissions. An engine has its center of gravity situated behind the drive wheel axles to balance the weight of the moving deck. Spring returns associated respectively with the two hydrostatic transmissions return the same to the neutral position when an operator releases the respective control levers.

REFERENCES:
patent: 2925134 (1960-02-01), Cunningham, Jr.
patent: 4809796 (1989-03-01), Yamaoka et al.
patent: 4878339 (1989-11-01), Marier et al.
patent: 4920734 (1990-05-01), Wenzel
patent: 4920735 (1990-05-01), Berrius
patent: 4991382 (1991-02-01), Scag
patent: 5020308 (1991-06-01), Braun et al.
patent: 5077959 (1992-01-01), Wenzel
Scag Power Equipment, "New Scag Zero-Turn Walker" (sales brochure) 1989.

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