Control lever

Details Control lever Control lever

1976-08-09

1977-11-08

Tudor, Harold

Electricity: circuit makers and breakers

Liquid contact

Pressure-deformable means

200 6A, 200 6185, 200329, H01H 906

Patent

active

040577015

ABSTRACT:
A control system for a pair of hydraulic lift actuators for adjusting the position of a blade-carrying frame of a motor grader includes a pair of control levers respectively operatively connected to a pair of direction control valves which are, in turn, respectively connected to the pair of actuators and selectively operable by means of the levers to place the actuators in neutral, extension, retraction, and float conditions. Each of the levers includes a hollow handle section having an electric switch mounted therein and a finger-operable sleeve is reciprocably mounted on the handle section for selectively closing the switch. Each switch is connected to an electrically responsive portion of a respective one of the control valves and when closed causes the valve to shift to effect the float condition in an associated one of the actuators.

REFERENCES:
patent: 2796773 (1957-06-01), Wooler et al.
patent: 3073918 (1963-01-01), Tarbox
patent: 3142227 (1964-07-01), Stringer
patent: 3484010 (1969-12-01), Campbell
patent: 3996433 (1976-12-01), Suzuki
"Dead Man Control Device", by A. Ludwig, Western Electric Technical Digest No. 1, Jan. 1966.

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