Carburetor arrangement

A carburetor for a gas powered engine comprising, in combination:

• a body member;
• first walls in said body member defining a first stage pressure regulating chamber in said body member having a first stage gas inlet port providing a gas flow passage into said first stage pressure regulating chamber, a first stage diaphragm for regulating gas pressure in said first stage pressure regulating chamber in a first preselected gas pressure range, a first stage metering lever movably mounted in said first stage pressure regulating chamber and operatively connected to said first stage diaphragm for selectively opening and closing said first stage gas inlet port in response to movement of said first stage diaphragm, and said first stage pressure regulating chamber having a first gas volume;
• second walls in said body member defining a second stage pressure regulating chamber in said body member having a second stage gas inlet port providing a gas flow passage into said second stage pressure regulating chamber for accepting a gas flow from said first stage pressure regulating chamber, a second stage gas outlet port, a second stage diaphragm for regulating gas pressure in said second stage pressure regulating chamber in a second preselected gas pressure range, and a second stage metering lever operatively connected to said second stage diaphragm for selectively opening and closing said second stage gas inlet port to provide to regulate gas pressure in said second stage pressure regulating chamber in a second preselected gas pressure range, and said second stage pressure regulating chamber having a second gas volume less than said first gas volume of said first stage pressure regulating chamber;
• first gas flow passage walls in said body member defining a first gas flow passage providing communication between said first stage pressure regulating chamber and said second stage pressure regulating chamber for allowing the flow of gas from said first stage pressure regulating chamber into said second stage pressure regulating chamber;
• third walls in said body member defining a metering chamber in said body member having a metering chamber gas inlet port providing a gas flow passage into said metering chamber for accepting a gas flow from said second stage pressure regulating chamber, a metering chamber diaphragm for operatively connected to a metering chamber gas flow lever, a metering needle having a first end, a body portion, a second end and a neck portion connecting said second end to said body portion and said metering chamber gas flow lever movably connected to said neck portion of said metering needle and said gas inlet port having a conical seating surface for selective engagement and disengagement with said conical first end of said metering needle for the movement of said metering chamber gas flow lever towards and away from said gas inlet port of said metering chamber for metering the flow of gas through said metering chamber and said metering chamber having a third gas volume less than said second gas volume;
• fourth walls in said body member defining a throttle bore having an ambient air inlet port for allowing the flow of ambient air from regions external said body member into said throttle bore;
• fifth walls in said body member defining a gas flow passage providing communication between said metering chamber and said throttle bore to allow the flow of gas from said metering chamber into said throttle bore for mixing with said ambient air to provide an air/gas mixture;
• sixth walls in said body member defining an air/gas mixture outlet port for allowing the flow of the air/gas mixture to regions external said body member.

A carburetor for connection to a gas powered engine for receiving gas phase and/or liquid phase and or a mixture of gas phase and liquid phase of liquified petroleum gas from a liquified petroleum gas storage container wherein the liquified gas storage container has both a liquid phase and a gas phase of said liquified gas therein and said gas phase is at a storage gas pressure on the order of 150 pounds per square inch, and comprising, in combination:

• a body member;
• first walls in said body member defining a first stage pressure regulating chamber in said body member having a first stage gas inlet port for receiving at least one of a gas phase, a mixture of gas phase and liquid phase and liquid phase of liquified petroleum gas from the liquified petroleum storage bottle, a first stage diaphragm movably mounted in said first stage pressure regulating chamber for regulating the gas pressure of the gas in said first stage pressure regulating chamber in a first preselected gas pressure range less than said storage gas pressure, and said first stage pressure regulating chamber having a first gas volume and a first surface area;
• second walls in said body member defining a second stage pressure regulating chamber in said body member for receiving gas from said first stage pressure regulating chamber, a second stage diaphragm movably mounted in said second stage pressure regulating chamber for regulating the gas pressure of the gas in said second stage pressure regulating chamber in a second preselected gas pressure range, lower than said first preselected gas pressure range, and said second stage pressure regulating chamber having a second gas volume less than said first gas volume of said first stage pressure regulating chamber and a second surface area less than said first surface area;
• first gas flow passage walls in said body member defining a first gas flow passage providing communication between said first stage pressure regulating chamber and said second stage pressure regulating for allowing the flow of gas from said first stage pressure regulating chamber into said second stage pressure regulating chamber;
• third walls in said body member defining a metering chamber in said body member having a metering chamber gas inlet port providing a gas flow passage into said metering chamber for accepting a gas flow from said second stage pressure regulating chamber, a metering chamber diaphragm for operatively connected to a metering chamber gas flow lever, a metering needle having a first end, a body portion, a second end and a neck portion connecting said second end to said body portion and said metering chamber gas flow lever movably connected to said neck portion of said metering needle and said gas inlet port having a conical seating surface for selective engagement and disengagement with said conical first end of said metering needle for the movement of said metering chamber gas flow lever towards and away from said gas inlet port of said metering chamber for metering the flow of gas through said metering chamber and said metering chamber having a third gas volume less than said second gas volume.