Fuel canister and adapter for insect repellent device
A gas-fueled portable device for the thermal dispensing of volatile materials such as insect repellents is described. The device employs a pressure regulator to establish gas flow, heat generation, and dispensing temperature at pre-determined optimal values. The automatic operation at pre-determined settings provides simple on/off operation for the user of the device.
1. A gas-fueled, portable device for dispensing a heat-volatilizable substance, comprising
a. a tank connection means to receive a fuel tank, wherein engagement of the fuel tank with the tank connection means opens a valve in the fuel tank and admits gaseous fuel into a pressure regulator valve, the pressure regulator valve being operable by a movable plunger;
b. a valve spring biasing the pressure regulator valve toward the closed position, and a regulator spring biasing the movable plunger so as to exert a counter-force that biases the pressure regulator valve toward the open position;
c. a valve switch having an off position and an on position, operable by a user and operably connected to a lever;
d. the lever being operably connected to and causing a movement of a plunger stop, the movement of the plunger stop alternately opening and closing the pressure regulator valve upon movement of the valve switch alternately between the on position and the off position;
e. a pressure regulator in fluid communication with the pressure regulator valve and operating the pressure regulator valve so as to maintain a predetermined gas pressure downstream of the pressure regulator when the pressure regulator valve is open;
f. a fuel combustion means downstream of and in fluid communication with the pressure regulator; and
g. a sole plate in thermal communication with the fuel combustion means and having a heated surface for heating the heat-volatilizable substance;
wherein, when the valve switch is moved to the “off” position, the lever moves the plunger stop against the bias of the regulator spring, thereby allowing the valve spring to move the movable plunger and close the pressure regulator valve, and when the valve switch is moved to the “on” position, the lever moves the plunger stop in the opposite direction, thereby allowing the regulator spring to bias the movable plunger in opposition to the bias of the valve spring; and
wherein the pressure regulator valve, when open, meters the flow of the gaseous fuel through the fuel combustion means at a predetermined rate, so as to sustain a predetermined rate of fuel combustion which heats the sole plate to a predetermined temperature, the temperature being sufficient to dispense the heat-volatilizable substance from the heated surface.
2. The gas-fueled portable device according to claim 1 , wherein the tank connection means comprises female 7/16 inch UNEF threads and is adapted to operably connect the device to a fuel tank having a Linda′ model B188 valve.
3. The gas-fueled portable device according to claim 2 , wherein the fuel combustion means is a fuel nozzle adapted to support a flame.
4. The gas-fueled portable device according to claim 3 , further comprising a piezoelectric fuel igniter.
5. The gas-fueled portable device according to claim 2 , further comprising a piezoelectric fuel igniter.
6. The gas-fueled portable device according to claim 2 , wherein the fuel combustion means is a catalytic burner.
7. The gas-fueled portable device according to claim 1 , wherein the fuel combustion means is a fuel nozzle adapted to support a flame.
8. The gas-fueled portable device according to claim 7 , further comprising a piezoelectric fuel igniter.
9. The gas-fueled portable device according to claim 1 , further comprising a piezoelectric fuel igniter.
10. The gas-fueled portable device according to claim 1 , wherein the fuel combustion means is a catalytic burner.