Carburator

Claim 2

In combination a multi-cylinder internal combusion engine with an intake manifold with two related sets of tunnels, each set of tunnels communicating with one half of the cylinders and each having a common upwardly opening inlet end, said carburator releasably secured to the manifold and having two elongate vertically extending venturi throats, each having a lower end communicating with the inlet end of one set of tunnels in the manifold, an air conducting throat communicating with one of said sets of tunnels, throttle valve members in the lower portions of the venturi throats and a shut-off valve member in the air conducting throat, fuel dispensing idle jets in the venturi throats below the throttle valve members and fuel dispensing high speed jets in the venturi throats above the throttle valve members, fuel delivery means to deliver fuel to the jets, manually operable selector means to selectively move the shut-off valve member between open and closed positions and to hold the one throttle valve member in the venturi throat communicating with said one set of tunnels in a closed position when the shut-off valve member is in an open position and manually operable throttle valve operating means to synchronously shift the throttle valve members between open and closed positions when said one throttle valve member is not held closed and to shift the other throttle valve member between open and closed positions when said one throttle valve member is held closed.

Claim 3

The structure set forth in claim 1 wherein the operating means is in direct driving engagement with said other throttle valve member and said one throttle valve member is drivingly coupled with said operating means by resilient coupling, means said selector means being shiftable into and out of driving engagement with said one throttle valve member and biasing the spring coupling when shifted to close said one throttle valve member.

Claim 4

The structure set forth in claim 1 wherein said other throttle valve member is a butterfly valve member on an inner shaft extending through and projecting from sides of the carburator, said one throttle valve member is a butterfly valve member on a tubular outer shaft engaged about a portion of the inner shaft and projecting from a side of the carburator, said operating means comprising lever and link means connected with an end of the inner shaft and operable to rotate that shaft and resilient torsional coupling means between the inner and outer shafts, said shut-off valve member being a butterfly valve on an operating shaft rotatably engaged through and projecting from the carburator, said selector means includes first and second lever arms on the operating shaft and outer shaft, an elongate axially reciprocal rod with a portion coupled to the first lever arm and carrying a stop shiftable into and out of driving engagement with the second lever arm and drive means to selectively reciprocate the rod axially.

Claim 5

In combination, an eight cylinder reciprocating internal combusion engine, an intake manifold with first and second sets of four tunnels, each set conducting fuel and air to four of the cylinders of the engine and each set having a common upwardly opening inlet end, a carburator mounted on the manifold and having first and second elongate vertically extending and opening venturi throats communicating with the inlet end of the first and second set of tunnels, respectively, an elongate vertically extending and opening air throat communicating with the inlet end of the second set of tunnels, first and second butterfly throttle valves in the first and second venturi throats and pivotally carried by first and second shafts extending through and projecting outward from the carburator, idle and high speed fuel metering jets communicating with the venturi throats above and below the throttle valves, and fuel delivery means delivering fuel to the jets, a butterfly shut-off valve in the air throat and pivotally carried by an operating shaft extending through and projecting outwardly from the carburator, throttle valve operating means including manually operable link and lever means drivingly engaging an end of said first shaft and operable to open and close the first throttle valve and a yieldable torsion spring drive coupling between the first and second shafts, selector means connected with the operating shaft and coupled with that shaft to selectively open and close the shut-off valve and to hold the second throttle valve closed against the resistance of the coupling when the shut-off valve is open.

Claim 6

In combination, an eight cylinder reciprocating internal combusion engine, an intake manifold with first and second sets of four tunnels, each set conducting fuel and air to four of the cylinders of the engine and each set having a common upwardly opening inlet end, a carburator mounted on the manifold and having first and second elongate vertically extending and opening venturi throats communicating with the inlet end of the first and second set of tunnels, respectively, an elongate vertically extending and opening air throat communicating with the inlet end of the second set of tunnels, first and second butterfly throttle valves in the first and second venturi throats and pivotally carried by first and second shafts extending through and projecting outward from the carburator, idle and high speed fuel metering jets communicating with the venturi throats above and below the throttle valves, and fuel delivery means delivering fuel to the jets, a butterfly shut-off valve in the air throat and pivotally carried by an operating shaft extending through and projecting outwardly from the carburator, throttle valve operating means including manually operable link and lever means drivingly engaging an end of said first shaft and operable to open and close the first throttle valve and a yieldable torsion spring drive coupling between the first and second shafts, selector means connected with the operating shaft and coupled with that shaft to selectively open and close the shut-off valve and to hold the second throttle valve closed against the resistance of the coupling when the shut-off valve is open.

Claim 7

The structure set forth in claim 4 wherein the selector means comprises first and second lever arms projecting radially from the ends of the operating and second shafts, an elongate reciprocating rod extending between and occurring adjacent to the first and second lever arms, means pivotally connecting the rod with the first lever arm and a stop on the rod, said stop being spaced from the second lever arm when the rod is moved in one direction to position the shut-off valve is in its closed position and in driving engagement with the second lever arm to move the second throttle valve to a closed position when the rod is moved in the other direction and moves the shut-off valve to its open position.

Claim 8

The structure set forth in claim 5 wherein said valves are carried by a plate-like section of the carburator and has ports which define the lower end portions and lower open ends of the throats.