Patent Number: 6,307,461

Title: Spring load reduction thermostat

Abstract: A temperature responsive switch includes a housing, electrical contacts, an actuator arm, a rotatable shaft, and a cam assembly to open and close an electrical power circuit in response to environmental conditions. The cam assembly includes a cam and a cam follower attached to the actuator arm with a bias spring and contacting a cam surface. The cam surface has a first portion for adjusting the temperature calibration of the switch, and a second portion for positioning the cam follower in an OFF position that reduces the load on the bias spring. Thus, spring losses are avoided when the cam follower is in the OFF position, and the switch may be more accurately calibrated and adjusted when the switch is returned from the OFF position.

Inventors: Frank; James P. (Rock Falls, IL), Gonzalez; Manuel L. (Sterling, IL), Poling; Ronald W. (Morrison, IL)

Assignee: General Electric Company

International Classification: H01H 35/24 (20060101); H01H 35/26 (20060101); H01H 89/04 (20060101); H01H 21/50 (20060101); H01H 19/00 (20060101); H01H 19/03 (20060101); H01H 21/00 (20060101); H01H 037/28 (); H01H 035/24 ()

Expiration Date: 10/23/2018