Gas cut-off assembly for gas heater

Abstract

A gas cut-off assembly for a gas heater includes a top part and a bottom part, and a middle part is connected between the top and bottom parts. The top part is connected with a valve connected to a burner. The bottom part is connected to the gas source. The middle part has a flange through which a central hole is defined. A ball is movably received between the top part and the middle part. A plunge movably extends through the central hole to push the ball which is pushed upward to open the central hole to allow gas to pass and flow to the burner. When the heater is titled, the ball rolls aside and the plunge is pushed by a resilient unit to seal the central hole to cut off the supply of the gas.

What is claimed is: 
     
         1 . A gas cut-off assembly for a gas heater, comprising:
 a top part, a middle part and a bottom part, the top part having a first end adapted to be connected to an inlet of a valve, the middle part connected to between a second end of the top part and a first end of the bottom part, the top part having an outlet which is adapted to communicate with the inlet of the valve, the middle part having a central hole defined therein, the bottom part having an entrance which is adapted to communicate with a gas source, the outlet, the central hole and the entrance communicating with each other, a ball movably received between the top part and the middle part, a plunge movably extending through the central hole of the middle part so as to push the ball, the plunge having a board connected thereto which removably seals the central hole of the middle part, a resilient unit resiliently pushing the plunge to seal the central hole of the middle part by the board, when the heater is located upright, the ball pushes the plunge toward the bottom part and the board is removed from the central hole which is adapted to allow gas from the gas source to pass and flow to the inlet of the valve, when the heater is tilted, the ball moves aside and away from a movement path of the plunge, the plunge is pushed by the resilient unit toward the top part and the board seals the central hole.   
     
     
         2 . The gas cut-off assembly as claimed in  claim 1 , wherein the top part has a first threaded portion formed on the second end thereof so as to be connected to the middle part, the bottom part has a second threaded portion formed on the first end thereof so as to be connected to the middle part, a sealing unit is clamped between the second end of the top part and the middle part, and between the first end of the bottom part and the middle part. 
     
     
         3 . The gas cut-off assembly as claimed in  claim 1 , wherein the top part has multiple top locking holes which are located corresponding to top threaded holes of the middle part, the bottom part has multiple bottom locking holes which are located corresponding to bottom threaded holes of the middle part, bolts respectively extend through the top locking holes and the bottom locking holes, and are threadedly connected to the top threaded holes and the bottom threaded holes of the middle part, a sealing unit is clamped between the top part and the middle part, and between the bottom part and the middle part. 
     
     
         4 . The gas cut-off assembly as claimed in  claim 1 , wherein the second end of the top part is force-fitted to the middle part, the bottom part has a second threaded portion formed on the first end thereof so as to be connected to the middle part. 
     
     
         5 . The gas cut-off assembly as claimed in  claim 1 , wherein the middle part has a flange formed therein which has the central hole through which the plunge extends. 
     
     
         6 . The gas cut-off assembly as claimed in  claim 5 , wherein a support member is located on a top of the flange and includes a recess defined therein, the support member has a guide hole through which the plunge extends, the support member has a through hole which is adapted to allow gas to pass therethrough, a securing member is located beneath the flange and has a passage through which the plunge extends. 
     
     
         7 . The gas cut-off assembly as claimed in  claim 1 , wherein the middle part has a flange formed therein which has the central hole through which the plunge extends, the flange has a support portion which is a recess in which the ball is received. 
     
     
         8 . The gas cut-off assembly as claimed in  claim 7 , wherein the central hole includes a guiding hole, two ribs connected between an inner wall and an outer wall of the guiding hole, and a path defined between the two ribs, the path communicates with a top and a bottom of the flange. 
     
     
         9 . The gas cut-off assembly as claimed in  claim 1 , wherein the plunge includes a restriction portion to which the board is connected, a plate is connected to an outside of the board, the resilient unit biases the plate. 
     
     
         10 . The gas cut-off assembly as claimed in  claim 9 , wherein the resilient unit has one end biasing the board, the plate or the restriction portion, the other end of the resilient unit biases the bottom part. 
     
     
         11 . The gas cut-off assembly as claimed in  claim 6 , wherein the resilient unit has one end biasing the board, the other end of the resilient unit biases the bottom part or the securing member of the bottom part.