Ignition circuit deenergizing spring for gas appliance valve- switch

摘要

A turn-back spring for use with a valve-switch assembly of the type employed to control the flow of gas to the burners of a gas appliance and to energize an associated electrical ignition circuit for igniting gas flowing from the burners. The spring is mounted on the valve body of the valve-switch assembly so that one end of the spring engages a lug on the drive washer of the stem of the rotatable valve member, thereby offering increasing resistance to rotation of the valve member beyond a predetermined position corresponding to a substantially full- open position of the valve. The valve stem extends through an annular bushing which is rotatably mounted in the electrical switch of the assembly and which is effective to close the contacts of the switch when the valve member and its stem are rotated to a gas flow igniting position somewhat beyond the substantially full-open position of the valve. The spring automatically rotates the valve member back to its substantially full- open position whenever a user releases the operating knob on the outer end of the valve stem.