Carburetor

Claim 2

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivotEd on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit is proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, and operating condition responsive means controlling the position of said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow, said operating condition responsive means including an aneroid responsive to inlet air pressure and operative to increase the length of said second lever arm upon a decrease in inlet air pressure whereby a proper proportion of fuel flow to air flow is maintained upon a decrease in inlet air pressure.

Claim 3

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivoted on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit is proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, and operating condition responsive means controlling the position of said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow, said operating condition responsive means including a device responsive to inlet air temperature and operative to increase the length of said second lever arm upon an increase in inlet air temperature whereby a proper proportion of fuel flow to air flow is maintained upon an increase in inlet air temperature.

Claim 4

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivoted on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit is proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, and operating condition responsive means controlling the position of said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow, said operating condition responsive means including a device responsive to inlet air temperature and operative to increase the length of said second lever arm upon an increase in inlet air temperature whereby a proper proportion of fuel flow to air flow is maintained upon an increase in inlet air temperature.

Claim 5

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivoted on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit is proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, and operating condition responsive means controlling the position of Said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow, said operating condition responsive means including a device responsive to pressure in said mixture conduit downstream of said throttle and operative to decrease the length of said second lever arm upon an increase in such pressure above a selected level whereby the proportion of fuel flow to air flow is increased upon an increase in such pressure above such level.

Claim 6

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivoted on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit is proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, and operating condition responsive means controlling the position of Said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow, said operating condition responsive means including a device responsive to pressure in said mixture conduit downstream of said throttle and operative to decrease the length of said second lever arm upon an increase in such pressure above a selected level whereby the proportion of fuel flow to air flow is increased upon an increase in such pressure above such level.

Claim 7

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivoted on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit is proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, and operating condition responsive means controlling the position of said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow, said operating condition responsive means including a pivoted supplementary lever having one lever arm connected to said link and another lever arm, an aneroid responsive to inlet air pressure and temperature and having one end thereof connected to said other lever arm and operative to pivot said supplementary lever to move said link in said slot away from said pivot pin upon a decrease in inlet air pressure or an increase in inlet air temperature, and a device responsive to pressure in said mixture conduit downstream of said throttle connected to the other end of said aneroid and operative to move said aneroid and thereby pivot said supplementary lever to move said link in said slot away from said pivot pin upon a decrease in such mixture conduit pressure below a selected level whereby the area available for fuel flow through said metering orifice may be decreased upon a decrease in inlet air pressure, an increase in inlet air temperature, or a decrease in such mixture conduit pressure below such level.

Claim 8

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivoted on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit is proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, and operating condition responsive means controlling the position of said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow, said operating condition responsive means including a pivoted supplementary lever having one lever arm connected to said link and another lever arm, an aneroid responsive to inlet air pressure and temperature and having one end thereof connected to said other lever arm and operative to pivot said supplementary lever to move said link in said slot away from said pivot pin upon a decrease in inlet air pressure or an increase in inlet air temperature, and a device responsive to pressure in said mixture conduit downstream of said throttle connected to the other end of said aneroid and operative to move said aneroid and thereby pivot said supplementary lever to move said link in said slot away from said pivot pin upon a decrease in such mixture conduit pressure below a selected level whereby the area available for fuel flow through said metering orifice may be decreased upon a decrease in inlet air pressure, an increase in inlet air temperature, or a decrease in such mixture conduit pressure below such level.

Claim 9

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivoted on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit iS proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, operating condition responsive means controlling the position of said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow, said operating condition responsive means including a pivoted supplementary lever having one lever arm connected to said link and another lever arm, an aneroid responsive to inlet air pressure and temperature and having one end thereof connected to said other lever arm and operative to pivot said supplementary lever to move said link in said slot away from said pivot pin upon a decrease in inlet air pressure or an increase in inlet air temperature, and a device responsive to pressure in said mixture conduit downstream of said throttle connected to the other end of said aneroid and operative to move said aneroid and thereby pivot said supplementary lever to move said link in said slot away from said pivot pin upon a decrease in such mixture conduit pressure below a selected level, whereby the area available for fuel flow through said metering orifice may be decreased upon a decrease in inlet air pressure, an increase in inlet air temperature, or a decrease in such mixture conduit pressure below such level, a pivoted additional lever carrying said pivot pin, and temperature responsive means pivoting said additional lever whereby the proportion of fuel flow to air flow may be increased upon a decrease in temperature.

Claim 10

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivoted on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit iS proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, operating condition responsive means controlling the position of said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow, said operating condition responsive means including a pivoted supplementary lever having one lever arm connected to said link and another lever arm, an aneroid responsive to inlet air pressure and temperature and having one end thereof connected to said other lever arm and operative to pivot said supplementary lever to move said link in said slot away from said pivot pin upon a decrease in inlet air pressure or an increase in inlet air temperature, and a device responsive to pressure in said mixture conduit downstream of said throttle connected to the other end of said aneroid and operative to move said aneroid and thereby pivot said supplementary lever to move said link in said slot away from said pivot pin upon a decrease in such mixture conduit pressure below a selected level, whereby the area available for fuel flow through said metering orifice may be decreased upon a decrease in inlet air pressure, an increase in inlet air temperature, or a decrease in such mixture conduit pressure below such level, a pivoted additional lever carrying said pivot pin, and temperature responsive means pivoting said additional lever whereby the proportion of fuel flow to air flow may be increased upon a decrease in temperature.

Claim 11

A carburetor comprising means defining a downdraft mixture conduit, a fuel bowl disposed beside said mixture conduit, a cover disposed above said fuel bowl and having an upwardly extending rim disposed thereabout, a fuel passage extending from said fuel bowl to said mixture conduit, and a metering orifice disposed in said passage, a metering rod having one end disposed in said orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, an air valve disposed in said mixture conduit and rotatable between closed and open positions, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said mixture conduit, a first pivot pin disposed above said cover within said rim, a first lever disposed above said cover within said rim and pivoted on said pin and having a slot formed therein, a first link having one end connected to said air valve and having the other end received in said slot for raising said lever about said pin as said air valve is moved from its closed position, a hanger having one end connected to said lever and extending through said cover and having the other end connected to said metering rod for positioning said metering rod to control the rate of said fuel flow in accordance with the position of said lever and thus in accordance with the rotative position of said air valve and thereby in accordance with the rate of said air flow, a second link disposed above said cover within said rim and having one end connected to said other end of said first link for varying its position in said slot to thereby vary the relative movement of said lever and said air valve and thus the proportions of said air flow and said fuel flow, a second pivot pin disposed above said cover within said rim, a second lever disposed above said cover within said rim and pivoted on said second pin and connected to the other end of said second link, a third link disposed above said cover within said rim and having one end connected to said lever, and operating condition responsive means connected to the other end of said third link for moving said third link to pivot said second lever to move said second link to vary the position of said other end of said first link in said slot to thereby vary the proportions of said air flow and said fuel flow in accordance with operating conditions.

Claim 12

A carburetor comprising means defining a downdraft mixture conduit, a fuel bowl disposed beside said mixture conduit, a cover disposed above said fuel bowl and having an upwardly extending rim disposed thereabout, a fuel passage extending from said fuel bowl to said mixture conduit, and a metering orifice disposed in said passage, a metering rod having one end disposed in said orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, an air valve disposed in said mixture conduit and rotatable between closed and open positions, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said mixture conduit, a first pivot pin disposed above said cover within said rim, a first lever disposed above said cover within said rim and pivoted on said pin and having a slot formed therein, a first link having one end connected to said air valve and having the other end received in said slot for raising said lever about said pin as said air valve is moved from its closed position, a hanger having one end connected to said lever and extending through said cover and having the other end connected to said metering rod for positioning said metering rod to control the rate of said fuel flow in accordance with the position of said lever and thus in accordance with the rotative position of said air valve and thereby in accordance with the rate of said air flow, a second link disposed above said cover within said rim and having one end connected to said other end of said first link for varying its position in said slot to thereby vary the relative movement of said lever and said air valve and thus the proportions of said air flow and said fuel flow, a second pivot pin disposed above said cover within said rim, a second lever disposed above said cover within said rim and pivoted on said second pin and connected to the other end of said second link, a third link disposed above said cover within said rim and having one end connected to said lever, and operating condition responsive means connected to the other end of said third link for moving said third link to pivot said second lever to move said second link to vary the position of said other end of said first link in said slot to thereby vary the proportions of said air flow and said fuel flow in accordance with operating conditions.

Claim 13

A carburEtor comprising means defining a downdraft mixture conduit, a fuel bowl disposed beside said mixture conduit, the bottom of said fuel bowl having a depression defining an upwardly opening well, a cover disposed above said fuel bowl, a straight fuel passage extending upwardly and transversely from a lower end opening axially from said well to an upper end opening laterally into said mixture conduit, and a metering orifice disposed in said passage near said upper end, a metering rod disposed in said passage and having one end disposed in said orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, said metering rod having its other end extending into said well, a hanger having one end connected to said other end of said metering rod and extending through said cover, a lever pivotally disposed above said cover and connected to the other end of said hanger, an air valve rotatably disposed in said mixture conduit, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said mixture conduit, and a link connecting said air valve and said lever whereby said air valve and said metering rod are moved in unison to proportion the rate of fuel flow through said metering orifice to said mixture conduit to the rate of air flow through said mixture conduit.

Claim 14

A carburEtor comprising means defining a downdraft mixture conduit, a fuel bowl disposed beside said mixture conduit, the bottom of said fuel bowl having a depression defining an upwardly opening well, a cover disposed above said fuel bowl, a straight fuel passage extending upwardly and transversely from a lower end opening axially from said well to an upper end opening laterally into said mixture conduit, and a metering orifice disposed in said passage near said upper end, a metering rod disposed in said passage and having one end disposed in said orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, said metering rod having its other end extending into said well, a hanger having one end connected to said other end of said metering rod and extending through said cover, a lever pivotally disposed above said cover and connected to the other end of said hanger, an air valve rotatably disposed in said mixture conduit, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said mixture conduit, and a link connecting said air valve and said lever whereby said air valve and said metering rod are moved in unison to proportion the rate of fuel flow through said metering orifice to said mixture conduit to the rate of air flow through said mixture conduit.

Claim 15

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivoted on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit is proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, and operating condition responsive means controlling the position of said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow.

Claim 16

A carburetor comprising a mixture conduit having an air inlet and a mixture outlet, a throttle disposed in said mixture outlet and controlling flow therethrough, an air valve rotatably disposed in said air inlet, means controlling said air valve whereby its rotative position is a measure of the rate of air flow through said air inlet, a fuel bowl, a fuel passage receiving fuel from said fuel bowl and discharging fuel into said mixture conduit, a metering orifice disposed in said fuel passage, a metering rod associated with said metering orifice and controlling the area thereof to control the rate of fuel flow from said fuel bowl through said passage and said orifice to said mixture conduit, a pivot pin, a lever pivoted on said pin, said lever having a first lever arm connected to said metering rod and a second lever arm, a link connected to said air valve and to said second lever arm whereby the positions of said lever and said metering rod are controlled by the rotative position of said air valve and the rate of fuel flow through said passage to said mixture conduit is proportioned to the rate of air flow through said air inlet, said second lever arm having a slot formed therein and receiving said link, and operating condition responsive means controlling the position of said link in said slot whereby the length of said second lever arm may be varied to adjust the proportion of fuel flow to air flow.