Hydraulic actuating apparatus

Details Hydraulic actuating apparatus Hydraulic actuating apparatus

1989-08-28

1991-04-02

Reynolds, Bruce A.

Electrical resistors

Resistance value responsive to a condition

Fluid- or gas pressure-actuated

338 39, 338160, 338176, H01C 1010, H01C 1030

Patent

active

050049968

ABSTRACT:
A hydraulic actuating apparatus for sensing hydraulic pressure and producing an output signal representative of the sensed hydraulic pressure includes a base portion, a case, and a variable resistor unit. A slider is movably connected to the variable resistor unit, and the variable resistor unit is connected to the base, the slider being movable relative to the variable resistor unit by an amount proportional to the hydraulic pressure applied to the slider. The variable resistor unit has a resistance which changes in response to movement of the slider. A resilient member is provided which is resiliently deformable by movement of the slider relative to the variable resistor unit, the resilient means exerting a restoring force on the slider opposing the movement of the slider caused by the hydraulic pressure. An adjusting mechanism is provided for setting an initial resistance value of the variable resistor unit, the variable resistor unit having a portion which is in contact with the adjusting mechanism.

REFERENCES:
patent: 4279162 (1981-07-01), Neill et al.
patent: 4433321 (1984-02-01), Widdowson
patent: 4449112 (1984-05-01), Gould
patent: 4778956 (1988-10-01), Betterton et al.

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