Light-spot-indication gas range switch device

Abstract

A light-spot-indication gas range switch device includes a switch knob seat to which an LED is mounted. A cam ring is fixed to a rotary shaft of a gas valve in such a way that a bulge section of an outer circumference of the cam ring corresponds to a rotation range within which a rotary switch knob opens the gas valve and a truncated section of the outer circumference corresponds to a location where the gas valve is closed. The micro-switch support bracket supports a micro-switch and is arranged in such a way that a switching tab of the micro-switch engages the outer circumference of the cam ring. When the rotary switch knob is turned to set up a range flame, the micro-switch is triggered and the LED is powered by an electrical source to give off light indicating the turning on of the gas range switch device.

1 . A light-spot-indication gas range switch device comprises a switch knob seat having a surface in which a light-emitting diode (LED) is mounted, a cam ring, a micro-switch, a micro-switch support bracket, a battery holder, and electrical wires, wherein the cam ring has a core portion fit over and fixed to a rotary shaft of a gas valve in such a way that a bulge section of an outer circumference of the cam ring corresponds to a rotation range within which a rotary switch knob that rotates the shaft to open the gas valve and a truncated section of the outer circumference corresponds to a location where the gas valve is closed by the rotation of the shaft by the rotary switch knob; wherein the micro-switch support bracket is attached to a valve flange of the gas valve close to the rotary shaft in such a way that a switching tab of the micro-switch that is fixed in the micro-switch support bracket is set to engage the outer circumference of the cam ring; wherein the battery holder receives and retains at least one battery therein and is mounted to an enclosure of the gas range at a location remote from a burner of the range and accessible by a user; wherein the battery holder, the LED, and the micro-switch are electrically coupled together by the wires, whereby with such an arrangement, when the rotary switch knob is turned to set up a range flame, the LED gives off light to indicate the turning on of the gas range switch device. 
   
   
       2 . The light-spot-indication gas range switch device according to  claim 1 , wherein connections of the electrical wires with the battery holder, the LED, and the micro-switch are respectively enclosed by insulation made of a material that is resistant to electricity and heat. 
   
   
       3 . The light-spot-indication gas range switch device according to  claim 1 , wherein the switch knob seat has an outer circumferential wall that forms a cone expanded in a direction toward a bottom of the gas range, the cone having a truncated free end that is centrally recessed to form a knob receiving cavity, a shaft bore being formed centrally in a bottom of the knob receiving cavity, the cone forming, at a location corresponding to a pre-set switching on position of the rotary switch knob, an LED receiving opening in which the LED is fit, the LED being in the form of a block having a prismatic or polyhedral configuration having a shape that when received in the opening, is substantially aligned with the outer surface of the cone.