US3743254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm carburetor
Assignee: Walbro Corp
•
Filing: 1970-12-10
•
Granted: 1973-07-03
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Expires: 1990-12-10
Abstract
Abstract A carburetor construction of the type utilizing a diaphragm controlled inlet valve wherein a pressure regulator valve is interposed between a fuel pump and a controlling diaphragm and an accelertor pump is provided to be normally expanded by a resilient bias and adapted to be pulsed by engine crankcase pressure upon the opening of a throttle valve by reason of a valving arrangement of said crankcase pressure responsive to said opening movement. Another feature of the carburetor construction disclosed is the use of an idle passage receiving fuel supply from a diaphragm chamber and leading to idle jets at the mixing passage, the idle passage passing a central area of the diaphragm chamber from which it is fed and being joined at that central area by an air bleed passage wherein the head of fuel at said point of joinder is substantially constant regardless of the position of the carburetor, thereby making it possible to balance out the control of the carburetor for varying positions of rotation in use.
Inventors
- 👤 C Tuckey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:57
CPC Classifications
F; F02; F02M; F02M17/00; F02M17/02; F02M17/04; Y; Y10; Y10S; Y10S261/00; Y10S261/68
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
378 words
In an all-position carburetor system for moving liquid fuel from a supply to an engine including a carburetor body to be mounted on an engine having a mixing passage with a venturi portion and a diaphragm chamber, an inlet control valve, a diaphragm acting on said valve in said chamber for controlling the opening and closing of said valve, and supply passages leading from a fuel supply inlet to a main jet opening at the venturi portion of said mixing passage, that improvement which comprises: a. means forming a pulse chamber connected to said supply passages, b. means in said pulse chamber resiliently biased to a position enlarging said chamber and movable to a position ensmalling said chamber, c. a pneumatic passage in said carburetor body having one end to serve as an inlet adapted to be connected to the crankcase of an engine to convey crankcase pressure from an engine and another end connected to said last-named biased means, d. a throttle valve in said mixing passage movable from an open throttle position to a closed throttle position, e. means responsive to movement of said throttle valve to open said pneumatic passage when said throttle is moved to open position to cause ensmalling of said pulse chamber thereby pushing an accleration charge into said main jet opening, and to close said pneumatic passage to effect enlarging of said pulse chamber when said throttle is closed thereby restoring a charge of fuel in said pulse chamber, f. means forming an extended passage for liquid idle fuel from said supply passages to said mixing passage adjacent said throttle valve, a portion of said passage for idle fuel passing through an area in said body transfixed by the axis line perpendicular to and passing through the center of said diaphragm, g. an air bleed passage connecting atmospheric air from a point spaced from the venturi portion of the mixing passage to said idle fuel passage at a juncture point at said portion of said idle fuel passage, and h. an idle fuel adjustment means positioned in said liquid idle fuel passage ahead of said air bleed passage whereby the liquid hydraulic head pressure at said juncture point is substantially equal regardless of the tipped or rotated position of said carburetor.
Claim 2
Dependent Claim
378 words
In an all-position carburetor system for moving liquid fuel from a supply to an engine including a carburetor body to be mounted on an engine having a mixing passage with a venturi portion and a diaphragm chamber, an inlet control valve, a diaphragm acting on said valve in said chamber for controlling the opening and closing of said valve, and supply passages leading from a fuel supply inlet to a main jet opening at the venturi portion of said mixing passage, that improvement which comprises: a. means forming a pulse chamber connected to said supply passages, b. means in said pulse chamber resiliently biased to a position enlarging said chamber and movable to a position ensmalling said chamber, c. a pneumatic passage in said carburetor body having one end to serve as an inlet adapted to be connected to the crankcase of an engine to convey crankcase pressure from an engine and another end connected to said last-named biased means, d. a throttle valve in said mixing passage movable from an open throttle position to a closed throttle position, e. means responsive to movement of said throttle valve to open said pneumatic passage when said throttle is moved to open position to cause ensmalling of said pulse chamber thereby pushing an accleration charge into said main jet opening, and to close said pneumatic passage to effect enlarging of said pulse chamber when said throttle is closed thereby restoring a charge of fuel in said pulse chamber, f. means forming an extended passage for liquid idle fuel from said supply passages to said mixing passage adjacent said throttle valve, a portion of said passage for idle fuel passing through an area in said body transfixed by the axis line perpendicular to and passing through the center of said diaphragm, g. an air bleed passage connecting atmospheric air from a point spaced from the venturi portion of the mixing passage to said idle fuel passage at a juncture point at said portion of said idle fuel passage, and h. an idle fuel adjustment means positioned in said liquid idle fuel passage ahead of said air bleed passage whereby the liquid hydraulic head pressure at said juncture point is substantially equal regardless of the tipped or rotated position of said carburetor.
Claim 3
Dependent Claim
240 words
An all-position carburetor system for moving liquid fuel from a supply to an engine which comprises: a. a carburetor body to be mounted on an engine having a mixing passage and supply passages leading from a main fuel supply reservoir to a main jet opening to said mixing passage, b. means forming a chamber to provide a supplemental fuel reservoir adjacent said main jet connected to said supply passages, whereby said main jet can receive fuel from said chamber, c. means in said chamber resiliently biased to a position enlarging a fuel receiving portion of said cHamber and movable to a position ensmalling said chamber, d. a pneumatic passage in said carburetor body having one end to serve as an inlet adapted to be connected to the crankcase of an engine to convey crankcase pressure from an engine and another end connected to said last-named biased means, e. a throttle valve in said mixing passage movable from an open throttle position to a closed throttle position, and f. valve means in said pneumatic passage movable in response to movement of said throttle valve to open said pneumatic passage when said throttle is moved to open position to cause ensmalling of said chamber thereby pushing an acceleration charge of fuel into said main jet opening, and to close said pneumatic passage to effect enlarging of said chamber when said throttle is closed thereby restoring a charge of fuel in said chamber.
Claim 4
Dependent Claim
240 words
An all-position carburetor system for moving liquid fuel from a supply to an engine which comprises: a. a carburetor body to be mounted on an engine having a mixing passage and supply passages leading from a main fuel supply reservoir to a main jet opening to said mixing passage, b. means forming a chamber to provide a supplemental fuel reservoir adjacent said main jet connected to said supply passages, whereby said main jet can receive fuel from said chamber, c. means in said chamber resiliently biased to a position enlarging a fuel receiving portion of said cHamber and movable to a position ensmalling said chamber, d. a pneumatic passage in said carburetor body having one end to serve as an inlet adapted to be connected to the crankcase of an engine to convey crankcase pressure from an engine and another end connected to said last-named biased means, e. a throttle valve in said mixing passage movable from an open throttle position to a closed throttle position, and f. valve means in said pneumatic passage movable in response to movement of said throttle valve to open said pneumatic passage when said throttle is moved to open position to cause ensmalling of said chamber thereby pushing an acceleration charge of fuel into said main jet opening, and to close said pneumatic passage to effect enlarging of said chamber when said throttle is closed thereby restoring a charge of fuel in said chamber.
Claim 5
Dependent Claim
122 words
A carburetor system as defined in claim 2 in which means is provided to form an idle jet passage leading from said main supply reservoir to a position to be open to an engine, passage means connecting said idle jet passage to said supplemental fuel chamber and to said main jet whereby to be exhausted of fuel during an open throttle period when said main jet is subject to aspiration pressure, said idle jet passage being subject also through the passage connection to said chamber to partial vacuum when said resiliently biased means moves in the direction of bias to enlarge said chamber thereby to delay idle fuel flow to an engine from the idle passage upon the closing of said throttle.
Claim 6
Dependent Claim
84 words
A carburetor system as defined in claim 3, said carburetor being shaped to be mounted on an engine having a fuel and air inlet vavle positioned to receive a mixture of fuel and air from said mixing passage, said idle jet passage being designed for flow in both directions of its length and terminating in a passageway extending from said carburetor such that it can project into an engine to a point adjacent and outside a fuel and air inlet valve of an engine.
Claim 7
Dependent Claim
311 words
An all-position carburetor system for moving liquid fuel from a supply to an engine having a fuel and air inlet manifold and a fuel and air inlet valve therein which comprises: a. a carburetor body adapted to be mounted on an engine manifold having a mixing passage positioned to discharge into said manifold and supply passages leading from a fuel supply inlet to a main jet opening to said mixing passage and idle jet passages leading to the engine manifold, b. means forming a first chamber adjacent said main jet and the origin of said idle jet passage at the end of and connected to said supply passage, c. a fuel pump, a pressure regulator valve, and a fuel supply valve in series in that order in said supply passage between said fuel inlet and said chamber, means including a diaphragm operating said fuel supply valve influenced by fluctuations in said mixing passage reflected through said supply passage, d. means forming a second chamber open to said main jet and said idle jet passages and second diaphragm means having an inside for closing one side of said second chamber and means resiliently biasing said second diaphragm to enlarge said chamber, e. a pneumatic passage adapted to connect the outside of said second diaphragm to the manifold of an engine to subject it to the pulse pressures of an engine on which it is mounted, f. a throttle valve in said mixing passage, and g. means to coordinate the action of said second diaphragm with said throttle valve to cause acceleration fuel to reach said main jet upon opening of said throttle and to delay fuel flowing into said idle jet upon closing said throttle comprising a valve in said pneumatic passage operable to open said passage upon opening of said throttle and to close said passage upon closing of said throttle.
Claim 8
Dependent Claim
311 words
An all-position carburetor system for moving liquid fuel from a supply to an engine having a fuel and air inlet manifold and a fuel and air inlet valve therein which comprises: a. a carburetor body adapted to be mounted on an engine manifold having a mixing passage positioned to discharge into said manifold and supply passages leading from a fuel supply inlet to a main jet opening to said mixing passage and idle jet passages leading to the engine manifold, b. means forming a first chamber adjacent said main jet and the origin of said idle jet passage at the end of and connected to said supply passage, c. a fuel pump, a pressure regulator valve, and a fuel supply valve in series in that order in said supply passage between said fuel inlet and said chamber, means including a diaphragm operating said fuel supply valve influenced by fluctuations in said mixing passage reflected through said supply passage, d. means forming a second chamber open to said main jet and said idle jet passages and second diaphragm means having an inside for closing one side of said second chamber and means resiliently biasing said second diaphragm to enlarge said chamber, e. a pneumatic passage adapted to connect the outside of said second diaphragm to the manifold of an engine to subject it to the pulse pressures of an engine on which it is mounted, f. a throttle valve in said mixing passage, and g. means to coordinate the action of said second diaphragm with said throttle valve to cause acceleration fuel to reach said main jet upon opening of said throttle and to delay fuel flowing into said idle jet upon closing said throttle comprising a valve in said pneumatic passage operable to open said passage upon opening of said throttle and to close said passage upon closing of said throttle.
Claim 9
Dependent Claim
54 words
A carburetor system as defined in claim 5 in which said idle jet passages leading from said chamber are designed for flow in both directions of length and terminaTe at the end of a passageway leading from said carburetor body to deliver idle fuel to an engine beyond said fuel and air inlet valve.
Claim 10
Dependent Claim
349 words
An all-position carburetor system for moving liquid fuel from a supply to an engine which comprises: a. a carburetor body to be mounted on an engine having a mixing passage and a diaphragm chamber, an inlet control valve, a diaphragm acting on said valve in said chamber for controlling the opening and closing of said valve, and supply passages leading from a fuel supply inlet to a main jet opening at said mixing passages, b. means forming a pulse chamber connected to said supply passages, c. means in said pulse chamber resiliently biased to a position enlarging said chamber and movable to a position ensmalling said chamber, d. a pneumatic passage in said carburetor body having one end to serve as an inlet adapted to be connected to the crankcase of an engine to convey crankcase pressure from an engine and another end connected to said last-named biased means, e. a throttle valve in said mixing passage movable from an open throttle position to a closed throttle position, f. means responsive to movement of said throttle valve to open said pneumatic passage when said throttle is moved to open position to cause ensmalling of said pulse chamber thereby pushing an acceleration charge into said main jet opening, and to close said pneumatic passage to effect enlarging of said pulse chamber when said throttle is closed thereby restoring a charge of fuel in said pulse chamber, g. means forming an extended passage for liquid idle fuel from said supply passages to said mixing passage adjacent said throttle valve, said passage for idle fuel passing through an area in said body transfixed by the axis line perpendicular to and passing through the center of said diaphragm, h. an air bleed passage connecting air to said idle fuel passage at said area, wherein the liquid head in said idle fuel passage transmitted from said diaphragm chamber to the air bleed juncture will assure balanced fuel feed in rotated positions of said carburetor, and i. an idle fuel manual adjustment positioned in said liquid idle fuel passage ahead of said air bleed passage.
Claim 11
Dependent Claim
349 words
An all-position carburetor system for moving liquid fuel from a supply to an engine which comprises: a. a carburetor body to be mounted on an engine having a mixing passage and a diaphragm chamber, an inlet control valve, a diaphragm acting on said valve in said chamber for controlling the opening and closing of said valve, and supply passages leading from a fuel supply inlet to a main jet opening at said mixing passages, b. means forming a pulse chamber connected to said supply passages, c. means in said pulse chamber resiliently biased to a position enlarging said chamber and movable to a position ensmalling said chamber, d. a pneumatic passage in said carburetor body having one end to serve as an inlet adapted to be connected to the crankcase of an engine to convey crankcase pressure from an engine and another end connected to said last-named biased means, e. a throttle valve in said mixing passage movable from an open throttle position to a closed throttle position, f. means responsive to movement of said throttle valve to open said pneumatic passage when said throttle is moved to open position to cause ensmalling of said pulse chamber thereby pushing an acceleration charge into said main jet opening, and to close said pneumatic passage to effect enlarging of said pulse chamber when said throttle is closed thereby restoring a charge of fuel in said pulse chamber, g. means forming an extended passage for liquid idle fuel from said supply passages to said mixing passage adjacent said throttle valve, said passage for idle fuel passing through an area in said body transfixed by the axis line perpendicular to and passing through the center of said diaphragm, h. an air bleed passage connecting air to said idle fuel passage at said area, wherein the liquid head in said idle fuel passage transmitted from said diaphragm chamber to the air bleed juncture will assure balanced fuel feed in rotated positions of said carburetor, and i. an idle fuel manual adjustment positioned in said liquid idle fuel passage ahead of said air bleed passage.
Claim 12
Dependent Claim
218 words
An all-position carburetor system for moving liquid fuel from a supply to an engine which comprises: a. a carburetor body to be mounted adjacent an engine having a mixing passage and supply passages leading from a fuel supply inlet to a main jet opening at said mixing passage, b. a fuel inlet control valve, c. a diaphragm located in a relatively flat diaphragm chamber in said body acting on said fuel inlet control valve in response to pressure fluctuations in said mixing passage, said chamber being connected in said supply passage between said fuel supply inlet and said main jet, d. means forming an elongated passage for idle liquid fuel from said chamber to an idle fuel outlet, said idle fuel passage extending over said chamber to an area at the center of said chamber before passing to said mixing chamber, e. means forming an air bleed passage extending over said chamber to connect air to said idle fuel passage at said area wherein solid fuel flows through said idle fuel passage from said chamber to said area and an air and fuel mixture flows through said idle fuel passage from said area to the idle fuel outlet, and f. an idle fuel manual adjustment positioned in said liquid idle fuel passage ahead of said air bleed passage.
Claim 13
Dependent Claim
218 words
An all-position carburetor system for moving liquid fuel from a supply to an engine which comprises: a. a carburetor body to be mounted adjacent an engine having a mixing passage and supply passages leading from a fuel supply inlet to a main jet opening at said mixing passage, b. a fuel inlet control valve, c. a diaphragm located in a relatively flat diaphragm chamber in said body acting on said fuel inlet control valve in response to pressure fluctuations in said mixing passage, said chamber being connected in said supply passage between said fuel supply inlet and said main jet, d. means forming an elongated passage for idle liquid fuel from said chamber to an idle fuel outlet, said idle fuel passage extending over said chamber to an area at the center of said chamber before passing to said mixing chamber, e. means forming an air bleed passage extending over said chamber to connect air to said idle fuel passage at said area wherein solid fuel flows through said idle fuel passage from said chamber to said area and an air and fuel mixture flows through said idle fuel passage from said area to the idle fuel outlet, and f. an idle fuel manual adjustment positioned in said liquid idle fuel passage ahead of said air bleed passage.
Claim 14
Dependent Claim
211 words
In an all-position diaphragm carburetor having a throttle-controlled mixing passage, a diaphragm-controlled fuel inlet valve, a main jet, idle jets, and adjustment control valves for said jets, a. a diaphragm chamber in said carburetor and a diaphragm in said chamber positioned to act on and to control a fuel inlet valve between open and closed positions, b. a main jet take-off port from said chamber controlled by said main jet adjustment control valve, c. a first passage from sAid port to a main jet leading to said mixing passage, d. a second passage from said first passage for idle fuel leading away from said main jet take-off port and leading to outlets for idle fuel, e. a control restriction in said idle fuel passage, and f. means forming an atmospheric air bleed independent of said outlets to connect air to said idle fuel passage at a point adjacent the center of the diaphragm chamber and the center axis normal to the diaphragm therein, between said idle fuel control restriction and said outlets, whereby aspiration of fuel through said main jet will empty the idle fuel passage between said chamber and said air bleed passage during open throttle operation and thereby cause delayed filling of said idle passage under closed throttle operation.
Claim 15
Dependent Claim
211 words
In an all-position diaphragm carburetor having a throttle-controlled mixing passage, a diaphragm-controlled fuel inlet valve, a main jet, idle jets, and adjustment control valves for said jets, a. a diaphragm chamber in said carburetor and a diaphragm in said chamber positioned to act on and to control a fuel inlet valve between open and closed positions, b. a main jet take-off port from said chamber controlled by said main jet adjustment control valve, c. a first passage from sAid port to a main jet leading to said mixing passage, d. a second passage from said first passage for idle fuel leading away from said main jet take-off port and leading to outlets for idle fuel, e. a control restriction in said idle fuel passage, and f. means forming an atmospheric air bleed independent of said outlets to connect air to said idle fuel passage at a point adjacent the center of the diaphragm chamber and the center axis normal to the diaphragm therein, between said idle fuel control restriction and said outlets, whereby aspiration of fuel through said main jet will empty the idle fuel passage between said chamber and said air bleed passage during open throttle operation and thereby cause delayed filling of said idle passage under closed throttle operation.
Claim 16
Dependent Claim
282 words
An all-position carburetor system for moving liquid from a supply to an engine which comprises: a. a carburetor body to be mounted adjcent an engine having a throttle-controlled mixing passage and supply passages leading from a fuel supply inlet to a main jet opening at said mixing passage, b. a fuel inlet control valve, c. a relatively flat diaphragm chamber formed in said body adjacent said mixing passage, a diaphragm located in said chamber subject to pressure fluctuations in said mixing passage and associated with said fuel inlet control valve to actuate said control valve in response to said pressure fluctuations, said chamber being connected in said supply passage between said fuel supply and said main jet, d. manual control means for limiting the fuel flow from said chamber to said main jet, e. means forming a passage for idle fuel from said chamber to an idle fuel outlet, said passage being connected to said main jet downstream of the main jet relative to the fuel supply inlet and diaphragm chamber and extending in a direction of the plane of the diaphragm to an idle adjustment valve and from said valve back over the diaphragm to a position overlying a central area on the perpendicular axis of said diaphragm chamber and then to the mixing passage, f. means forming an air bleed passage leading to a juncture with said idle fuel passage at said central area of said diaphragm, whereby aspiration of fuel through said main jet into said mixing passage will empty the idle fuel passage between said chamber and said air bleed passage during open throttle operation and thereby cause delayed filling of said idle passage under closed throttle operation.
Claim 17
Dependent Claim
282 words
An all-position carburetor system for moving liquid from a supply to an engine which comprises: a. a carburetor body to be mounted adjcent an engine having a throttle-controlled mixing passage and supply passages leading from a fuel supply inlet to a main jet opening at said mixing passage, b. a fuel inlet control valve, c. a relatively flat diaphragm chamber formed in said body adjacent said mixing passage, a diaphragm located in said chamber subject to pressure fluctuations in said mixing passage and associated with said fuel inlet control valve to actuate said control valve in response to said pressure fluctuations, said chamber being connected in said supply passage between said fuel supply and said main jet, d. manual control means for limiting the fuel flow from said chamber to said main jet, e. means forming a passage for idle fuel from said chamber to an idle fuel outlet, said passage being connected to said main jet downstream of the main jet relative to the fuel supply inlet and diaphragm chamber and extending in a direction of the plane of the diaphragm to an idle adjustment valve and from said valve back over the diaphragm to a position overlying a central area on the perpendicular axis of said diaphragm chamber and then to the mixing passage, f. means forming an air bleed passage leading to a juncture with said idle fuel passage at said central area of said diaphragm, whereby aspiration of fuel through said main jet into said mixing passage will empty the idle fuel passage between said chamber and said air bleed passage during open throttle operation and thereby cause delayed filling of said idle passage under closed throttle operation.
Claim 18
Dependent Claim
337 words
In an all-position diaphragm carburetor having a throttle-controlled mixing passage, a diaphragm-controlled fuel inlet valve, a main jet, idle jets, and adjustment control valves for said jets, a. a diaphragm chamber in said carburetor and a diaphragm in said chamber positioned to act on and to control said fuel inlet valve and means to connect the diaphragm with the fuel inlet valve, b. a main jet take-off port from said chamber controlled by said main jet adjustment control valve, c. a first passage from said port to a main jet leading to said mixing passage, d. a second passage from said first passage for idle fuel leading away from said main jet take-off port and leading to outlets for idle fuel, e. a control restriction in said idle fuel passage, f. means forming an atmospheric air bleed independent of said outlets to connect air to said idle fuel passage at a point between said control restriction and said outlets, whereby aspiration of fuel through said main jet will empty the idle fuel passage between said chamber and said air bleed passage during open throttle operation and thereby cause delayed filling of said idle passage under closed throttle operation, g. means forming a pulse chamber in said carburetor connected to said second passage, h. means in said pulse chamber resiliently biased to a position enlarging said pulse chamber and movable to a position ensmalling said pulse chamber, i. a pneumatic passage in said carburetor Body having one end to serve as an inlet adapted to be connected to the crankcase of an engine to convey crankcase pressure from an engine and another end connected to said last-named biased means, j. a throttle valve in said mixing passage movable from an open throttle position to a closed throttle position, and k. means responsive to movement of said throttle valve to open said pneumatic passage when said throttle is moved to open position to cause ensmalling of said pulse chamber, thereby pushing an acceleration charge into said main jet opening.
Claim 19
Dependent Claim
337 words
In an all-position diaphragm carburetor having a throttle-controlled mixing passage, a diaphragm-controlled fuel inlet valve, a main jet, idle jets, and adjustment control valves for said jets, a. a diaphragm chamber in said carburetor and a diaphragm in said chamber positioned to act on and to control said fuel inlet valve and means to connect the diaphragm with the fuel inlet valve, b. a main jet take-off port from said chamber controlled by said main jet adjustment control valve, c. a first passage from said port to a main jet leading to said mixing passage, d. a second passage from said first passage for idle fuel leading away from said main jet take-off port and leading to outlets for idle fuel, e. a control restriction in said idle fuel passage, f. means forming an atmospheric air bleed independent of said outlets to connect air to said idle fuel passage at a point between said control restriction and said outlets, whereby aspiration of fuel through said main jet will empty the idle fuel passage between said chamber and said air bleed passage during open throttle operation and thereby cause delayed filling of said idle passage under closed throttle operation, g. means forming a pulse chamber in said carburetor connected to said second passage, h. means in said pulse chamber resiliently biased to a position enlarging said pulse chamber and movable to a position ensmalling said pulse chamber, i. a pneumatic passage in said carburetor Body having one end to serve as an inlet adapted to be connected to the crankcase of an engine to convey crankcase pressure from an engine and another end connected to said last-named biased means, j. a throttle valve in said mixing passage movable from an open throttle position to a closed throttle position, and k. means responsive to movement of said throttle valve to open said pneumatic passage when said throttle is moved to open position to cause ensmalling of said pulse chamber, thereby pushing an acceleration charge into said main jet opening.
Claim 20
Dependent Claim
339 words
In an all-position diaphragm carburetor having a throttle-controlled mixing passage, a diaphragm-controlled fuel inlet valve, a main jet, idle jets, and adjustment control valves for said jets, a. a diaphragm chamber in said carburetor and a diaphragm in said chamber positioned to act on and to control said fuel inlet valve and means to connect the diaphragm with the fuel inlet valve, b. a main jet take-off port from said chamber controlled by said main jet adjustment control valve, c. a first passage from said port to a main jet leading to said mixing passage, d. a second passage from said first passage for idle fuel leading away from said main jet take-off port and leading to outlets for idle fuel, e. a control restriction in said idle fuel passage, f. means forming an atmospheric air bleed independent of said outlets to connect air to said idle fuel passage at a point between said control restriction and said outlets, whereby aspiration of fuel through said main jet will empty the idle fuel passage between said chamber and said air bleed passage during open throttle operation and thereby cause delayed filling of said idle passage under closed throttle operation, g. means forming a pulse chamber in said carburetor connected to said main jet take-off port, h. means in said pulse chamber resiliently biased to a position enlarging said pulse chamber and movable to a position ensmalling said pulse chamber, i. a pneumatic passage in said carburetor body having one end to serve as an inlet adapted to be connected to the crankcase of an engine to convey crankcase pressure from an engine and another end connected to said last-named biased means, j. a throttle valve in said mixing passage movable from an open throttle position to a closed throttle position, and k. means responsive to movement of said throttle valve to open said pneumatic passage when said throttle is moved to open position to cause ensmalling of said pulse chamber, thereby pushing an acceleration charge into said main jet opening.
Claim 21
Dependent Claim
339 words
In an all-position diaphragm carburetor having a throttle-controlled mixing passage, a diaphragm-controlled fuel inlet valve, a main jet, idle jets, and adjustment control valves for said jets, a. a diaphragm chamber in said carburetor and a diaphragm in said chamber positioned to act on and to control said fuel inlet valve and means to connect the diaphragm with the fuel inlet valve, b. a main jet take-off port from said chamber controlled by said main jet adjustment control valve, c. a first passage from said port to a main jet leading to said mixing passage, d. a second passage from said first passage for idle fuel leading away from said main jet take-off port and leading to outlets for idle fuel, e. a control restriction in said idle fuel passage, f. means forming an atmospheric air bleed independent of said outlets to connect air to said idle fuel passage at a point between said control restriction and said outlets, whereby aspiration of fuel through said main jet will empty the idle fuel passage between said chamber and said air bleed passage during open throttle operation and thereby cause delayed filling of said idle passage under closed throttle operation, g. means forming a pulse chamber in said carburetor connected to said main jet take-off port, h. means in said pulse chamber resiliently biased to a position enlarging said pulse chamber and movable to a position ensmalling said pulse chamber, i. a pneumatic passage in said carburetor body having one end to serve as an inlet adapted to be connected to the crankcase of an engine to convey crankcase pressure from an engine and another end connected to said last-named biased means, j. a throttle valve in said mixing passage movable from an open throttle position to a closed throttle position, and k. means responsive to movement of said throttle valve to open said pneumatic passage when said throttle is moved to open position to cause ensmalling of said pulse chamber, thereby pushing an acceleration charge into said main jet opening.
Claim 22
Dependent Claim
221 words
In combination, a carburetor having a mixing passage and an unvented fuel chamber, a throttle valve in the mixing passage, a flexible diaphragm forming a wall of the fuel chamber, a fuel inlet, a valve for said inlet, means transmitting movement of the diaphragm to the inlet valve, main and secondary fuel delivery outlets opening into the mixing passage, fuel passage means between the fuel chamber and the region of the main outlet, means for regulating fuel flow through said passage means, an elongated passage means in the carburetor extending from the main delivery outlet at the fuel chamber to the secondary fuel delivery outlet, said elongated passage means including a first bore in the carburetor surrounding the means for regulating the passage means between the fuel chamber and the main outlet and a second bore leading from said first bore in the direction of the diaphragm chamber to the center of the chamber and a third bore leading from said center to the secondary fuel outlets, and air vent means for admitting atmospheric air to said second bore at the center of the chamber to delay delivery of fuel through the secondary outlet upon movement of the throttle valve to engine-idling position and to insure a balanced liquid fuel head in said elongated passage up to said air vent means.
Claim 23
Dependent Claim
221 words
In combination, a carburetor having a mixing passage and an unvented fuel chamber, a throttle valve in the mixing passage, a flexible diaphragm forming a wall of the fuel chamber, a fuel inlet, a valve for said inlet, means transmitting movement of the diaphragm to the inlet valve, main and secondary fuel delivery outlets opening into the mixing passage, fuel passage means between the fuel chamber and the region of the main outlet, means for regulating fuel flow through said passage means, an elongated passage means in the carburetor extending from the main delivery outlet at the fuel chamber to the secondary fuel delivery outlet, said elongated passage means including a first bore in the carburetor surrounding the means for regulating the passage means between the fuel chamber and the main outlet and a second bore leading from said first bore in the direction of the diaphragm chamber to the center of the chamber and a third bore leading from said center to the secondary fuel outlets, and air vent means for admitting atmospheric air to said second bore at the center of the chamber to delay delivery of fuel through the secondary outlet upon movement of the throttle valve to engine-idling position and to insure a balanced liquid fuel head in said elongated passage up to said air vent means.
Claim 24
Dependent Claim
227 words
In a carburetor having a mixing passage and an unvented fueL chamber, a throttle valve in the mixing passage, a flexible diaphragm forming a wall of the fuel chamber, a fuel inlet, a valve for said inlet, means transmitting movement of the diaphragm to the inlet valve, main and secondary fuel delivery outlets opening into the mixing passage, a first fuel passage means between the fuel chamber and the region of the main outlet, means for regulating fuel flow through said first passage means, second fuel passage means between the fuel chamber and the region of the secondary fuel delivery outlets, means for regulating fuel flow through said second passage means, said second fuel passage means comprising a first bore originating at said fuel chamber extending in said carburetor in a direction away from said chamber, a second bore passing back over said fuel chamber to the center, and a third bore leading to the region of the secondary fuel delivery outlets, and vent means admitting air directly into said second passage means at the center of the fuel chamber for delaying delivery of fuel from the second passage means through the secondary outlet upon movement of the throttle valve to engine-idling position, said vent means being effective upon opening movement of the throttle to promote rapid delivery of fuel to the main outlet for engine acceleration.
Claim 25
Dependent Claim
227 words
In a carburetor having a mixing passage and an unvented fueL chamber, a throttle valve in the mixing passage, a flexible diaphragm forming a wall of the fuel chamber, a fuel inlet, a valve for said inlet, means transmitting movement of the diaphragm to the inlet valve, main and secondary fuel delivery outlets opening into the mixing passage, a first fuel passage means between the fuel chamber and the region of the main outlet, means for regulating fuel flow through said first passage means, second fuel passage means between the fuel chamber and the region of the secondary fuel delivery outlets, means for regulating fuel flow through said second passage means, said second fuel passage means comprising a first bore originating at said fuel chamber extending in said carburetor in a direction away from said chamber, a second bore passing back over said fuel chamber to the center, and a third bore leading to the region of the secondary fuel delivery outlets, and vent means admitting air directly into said second passage means at the center of the fuel chamber for delaying delivery of fuel from the second passage means through the secondary outlet upon movement of the throttle valve to engine-idling position, said vent means being effective upon opening movement of the throttle to promote rapid delivery of fuel to the main outlet for engine acceleration.
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US2215683A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |