Abstract: A hydraulic actuating apparatus includes a cylindrical case having a fitting at one end connectable to a source of pressurized oil, the fitting having a passage for communication with the pressurized oil, a slider slidably carried by the cylindrical case, the slider being slidable in response to the oil pressure, a first spring device for biasing the slider in a predetermined direction to resist the force on the slider applied by the oil pressure, a slidable contact device carried by the slider, an oil pressure sensor which includes a resistor and a ground conductor, the slidable contact device being slidably engaged with the resistor, the resistor being fixed with respect to the slidable contact device, and a second spring device for biasing the slider in the predetermined direction. The second spring device is connected to the slider, with the second spring device having a smaller spring constant than the first spring device.

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.

Abstract: Remote light controlled toy vehicle is provided with a transmitting source for infrared rays of predetermined frequency through a predetermined angle of radiation and a mobile toy operatively responsive to reception of the infrared rays. The mobile toy has at least first and second wheels and a motor; with there being a first gear train permanently connecting the motor and the first wheel and with there being a disengageable second motor gear train connecting the motor and the second wheel; the second motor train incorporating shiftable components so that upon rotation of the motor shaft in, one direction, motion transmission is inhibited. The vehicle contains first and second prima movers; the first being non-reactive to the infrared ray emissions so that the first gear train will operate with the other, or second, being inactive whereby the vehicle will tend to rotate about its vertical axis.