The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1977
Filed:
Feb. 05, 1976
Tosikatu Ito, Tohkai, JA;
Reijiro Takahashi, Katsuta, JA;
Hitachi, Ltd., Tokyo, JA;
Abstract
A temperature control apparatus of an air conditioner for automobiles, which comprises a blower for feeding air through a cooling unit and a heating unit disposed in an air passage, an air mix door for controlling the amount of air passing through the heating unit, an actuator for actuating said door, a negative pressure source for applying a negative pressure to said actuator through a controller, a sensor emitting a negative pressure signal in response to the temperature in a cab of an automobile and a regulator emitting a negative pressure signal in response to the change of the position of said door, wherein the output negative pressure signal of the temperature sensor is compared with the output negative pressure signal of the regulator by said controller and a negative pressure is applied to the actuator according to a deviation between said two output signals to control the degree of opening of said air mix door so as to maintain the temperature in the cab at a substantially constant level.