Brushing – scrubbing – and general cleaning – Machines – Brushing
Patent
1993-08-24
1995-06-27
Roberts, Jr., Edward L.
Brushing, scrubbing, and general cleaning
Machines
Brushing
15 82, 180306, F01H 102
Patent
active
054268052
ABSTRACT:
A walk-behind self-propelled device comprises a main frame including a base portion and a handle portion; a pair of wheels secured to the base portion for engaging the ground surface; an engine mounted on the base portion; a hydraulic pump carried by the base portion and operably connected to the engine; a first hydraulic motor directly coupled to the wheels and operably connected to the hydraulic pump; an attachment secured to the base portion; a second hydraulic motor directly coupled to the attachment and operably connected to the hydraulic pump; and first and second valves for controlling the first and second hydraulic motors, respectively. Each of the first and second valves has a bypass position whereby hydraulic fluid bypasses the first and second hydraulic motors. First and second handgrips are provided for operating the first and second valves, respectively. Each of the first and second handgrips includes a non-operative position corresponding with the first and second valves being in the bypass positions and the handgrips are normally biased in the non-operative positions.
REFERENCES:
patent: 3197798 (1965-08-01), Brown et al.
patent: 3284830 (1966-11-01), Kroll
patent: 3691579 (1972-09-01), Kasper
patent: 3833961 (1974-09-01), Fortman et al.
patent: 3837029 (1974-09-01), Kasper
patent: 4674143 (1987-06-01), Agergard et al.
patent: 5033564 (1991-07-01), Mattson
Roberts, Jr. Edward L.
Waldon, Inc.
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