Automatic switching system for car cooler

Claim 1

An automatic switching system for car cooler comprising a diaphragm room which is divided into two compartments by a diaphragm, a vacuum pressure which varies in accordance with the running conditions being introduced from an intake manifold of an engine into a first pressure compartment and the other open compartment being in air communication, a dielectric base plate which is provided adjacent to the open compartment and has a plurality of contacts to which a lead wire of an electric power source for a compressor of car cooler is connected, a center rod one end of which is attached perpendicular to the center of the diaphragm and the middle portion is reciprocably inserted into a center hole of the base plate, a switching member for making/breaking contacts attached to a spring member which is provided in the pressure compartment in compliance with the axial direction of the center rod for pressing the diaphragm to the direction of the base plate so that, when the vacuum pressure of the intake manifold is lowered in the acceleration period in which maximum engine power is needed, the diaphragm and the center rod is pressed by the spring member and the switching member is separated from the contacts to cut off the electric source of the compressor, and a slide member which is slidably fitted to the center rod side of the switching member and enforced by a slide spring whose center is fixed to a cover member of base plate and both ends are elastically in contact with the periphery of the slide member so as to prevent the surging of the center rod.