US3859974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold starting devices for internal combustion engines
Assignee: Zenith Carburetter Co Ltd
•
Filing: 1973-03-12
•
Granted: 1975-01-14
•
Expires: 1993-03-12
Abstract
Abstract A cold starting device for an i.c. engine has two throttles in an auxiliary air passage. The upstream throttle is closed and the downstream throttle is open for cranking. The upstream throttle opens progressively and the downstream throttle begins to close progressively when the engine begins to run under its own power. The downstream throttle is closed and the upstream throttle is open when the engine is running normally. One lever is fixed to the spindle of the downstream throttle and is connected via a lost motion connection to another lever journaled on that spindle. A temperature sensitive capsule controls rotary movement of the other lever. The two levers and the capsule are arranged so that closure movement of the downstream throttle is limited to that allowed by the lost motion connection and so that the downstream throttle is prevented from closing when the engine is cold, the other lever being moved by the capsule to permit further closure of the downstream throttle as the engine warms up. Means are provided to ensure that movement of the downstream throttle is accompanied by movement of the upstream throttle in the opposite sense. The lost motion connection between the two levers may comprise a post on the fixed lever which projects into an arcuate notch in the rotary lever. The arcuate length of the notch may be decreased as the engine temperature increases and vice versa.
Inventors
- 👤 Gray Ernest Donald Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:04
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
368 words
A cold starting device for an internal combustion engine, the cold starting device comprising a housing enclosing an auxiliary air supply passage, first and second throttle valve members disposed in the auxiliary air supply passage with the said second throttle valve upstream of the first throttle valve, resilient means for biasing said first throttle valve member towards the open position and the second throttle valve member towards the closed position, said first throttle valve member being arranged to be moved against the action of said resilient biasing means by air flowing past it to the engine into a position in which it restricts or prevents the flow of air past it to the engine and the second throttle valve member being arranged so as to tend to be moved against the action of said resilient biasing means to the open position by air flowing past it to the engine, at least one fuel supply orifice which opens into the portion of the auxiliary air supply passage which extends between the closed positions of said two throttle valve members whereby fuel can be drawn therethrough into said portion of the air supply passage by engine suction when said first throttle valve member is in the open position, and thermostatically operable control means for limiting movement of the two throttle valve members in the direction opposite to that in which they are biased by the resilient biasing means in accordance with engine temperature, the degree of movement of the two throttle valve members permitted by the thermostatically operable control means being increased as the engine temperature increases, said first throttle valve member being in the open position and said second throttle valve member being in the closed position at the commencement of engine starting and during the cranking period, and said first throttle valve member begins to close progressively and said other throttle valve member begins to open progressively when the engine commences to run under its own power, the progressive closing of said first throttle valve member and the progressive opening of said second throttle valve member continuing until the engine is running normally whereupon the supply of fuel into said portion of the auxiliary air supply passage ceases.
Claim 2
Dependent Claim
368 words
A cold starting device for an internal combustion engine, the cold starting device comprising a housing enclosing an auxiliary air supply passage, first and second throttle valve members disposed in the auxiliary air supply passage with the said second throttle valve upstream of the first throttle valve, resilient means for biasing said first throttle valve member towards the open position and the second throttle valve member towards the closed position, said first throttle valve member being arranged to be moved against the action of said resilient biasing means by air flowing past it to the engine into a position in which it restricts or prevents the flow of air past it to the engine and the second throttle valve member being arranged so as to tend to be moved against the action of said resilient biasing means to the open position by air flowing past it to the engine, at least one fuel supply orifice which opens into the portion of the auxiliary air supply passage which extends between the closed positions of said two throttle valve members whereby fuel can be drawn therethrough into said portion of the air supply passage by engine suction when said first throttle valve member is in the open position, and thermostatically operable control means for limiting movement of the two throttle valve members in the direction opposite to that in which they are biased by the resilient biasing means in accordance with engine temperature, the degree of movement of the two throttle valve members permitted by the thermostatically operable control means being increased as the engine temperature increases, said first throttle valve member being in the open position and said second throttle valve member being in the closed position at the commencement of engine starting and during the cranking period, and said first throttle valve member begins to close progressively and said other throttle valve member begins to open progressively when the engine commences to run under its own power, the progressive closing of said first throttle valve member and the progressive opening of said second throttle valve member continuing until the engine is running normally whereupon the supply of fuel into said portion of the auxiliary air supply passage ceases.
Claim 3
Dependent Claim
87 words
The cold starting device of claim 1 wherein said first throttle valve member is mounted on a spindle and a lever is mounted pivotally on that spindle, the said lever being coupled to the thermostatically operable control means so that there is a lost motion connection between the lever and said one throttle valve member which allows limited movement of said first throttle valve member relative to the lever in the closing direction caused by air flow in the auxiliary air supply passage due to engine suction.
Claim 4
Dependent Claim
79 words
The cold starting device of claim 1 wherein said first throttle valve member is mounted on one spindle, said second throttle valve member is mounted on another spindle and a lever fixed to said first spindle haS a radially extending finger which is adapted to strike an element fixed to the other spindle during opening movement of said first throttle valve member so as to close said second throttle valve member with opening of said first throttle valve member.
Claim 5
Dependent Claim
85 words
A cold starting device as claimed in claim 1, wherein the throttle valves have spindles and a lever is mounted pivotally on the spindle of said first throttle valve member and is coupled to a setting means, said first throttle member being connected to the lever by means of a lost motion connection which allows limited movement of said first throttle valve member relative to the lever in the closing direction caused by air flow in the auxiliary air supply passage due to engine suction.
Claim 6
Dependent Claim
58 words
A cold starting device as claimed in claim 1, including two said fuel supply orifices through which a fuel/air mixture is arranged to be fed into the portion of the auxiliary air supply passage between the closed positions of said two throttle valve members said two fuel supply orifices being located adjacent to said first throttle valve member.
Claim 7
Dependent Claim
52 words
A cold starting device as claimed in claim 5, wherein there is a said fuel supply orifice positioned adjacent to said second throttle valve member and arranged so that fuel can be drawn therethrough into the auxiliary air supply passage only when said second throttle valve member is in the closed position.
Claim 8
Dependent Claim
68 words
A cold starting device as claimed in claim 1, including a further fuel supply orifice which opens into said auxiliary air supply passage downstream of the closed position of said first throttle valve member and adjustment means are provided to vary the cross-sectional area of said further fuel supply orifice through which an air/fuel mixture can be supplied to meet at least part of the engine idling requirements.
Claim 9
Dependent Claim
48 words
A cold starting device as claimed in claim 1, wherein the two throttle valve members are coupled together mechanically so as to ensure that said first throttle valve member is in the closed position when said second throttle valve member is in the open position and vice versa.
Claim 10
Dependent Claim
53 words
A cold starting device as claimed in claim 3, wherein the lever also carries a resilient finger which is arranged to engage said element during closing movement of said first throttle valve member so as to ensure that said second throttle valve member is opened with closure of said first throttle valve member.
Claim 11
Dependent Claim
62 words
A cold starting device as claimed in claim 4, wherein the lost motion connection between said lever and said first throttle valve member comprises the engagement of a post carried by one of said lever and another lever, which is fixed to the spindle of said first throttle valve member, within an arcuate notch defined by the other of the two levers.
Claim 12
Dependent Claim
26 words
A cold starting device as claimed in claim 10, wherein the arcuate length of the arcuate notch is decreased as engine temperature increases and vice versa.
Claim 13
Dependent Claim
35 words
A cold starting device as claimed in claim 11, wherein the arcuate notch is defined between the lever which is mounted pivotally on the spindle of said first throttle valve member and a third lever.
Claim 14
Dependent Claim
42 words
A cold starting device as claimed in claim 12, wherein the third lever has a slot at one end which is mounted pivotally on the spindle of said first throttle valve member, the other being pinned to the body of the device.
Claim 15
Independent Claim
204 words
An apparatus responsive to engine temperature for feeding a fuel-air mixture to an intake manifold of an internal combustion engine comprising a housing adapted to be fastened to the said manifold and having a bore therethrough which is in fluid flow connection with the manifold, first and second throttle valves pivotally disposed in spaced relationship in the bore with the first valve nearest the said manifold, means for biasing said first throttle valve towards an open position, means responsive to movement of the first throttle valve for moving the second throttle valve towards an open position as the first thrOttle valve moves towards its closed position, said first throttle valve being disposed to be moved towards its closed position by air flow through the bore and said second throttle valve being disposed to be moved towards its open position by air flow through the bore, means responsive to the temperature of the engine for opposing movement of the first throttle valve away from its open position, said temperature reponsive means being adapted to require decreasingly less force for movement of the first throttle valve as the temperature of the engine increases, and means for introducing fuel into the bore between the two throttle valves.
Claim 16
Independent Claim
204 words
An apparatus responsive to engine temperature for feeding a fuel-air mixture to an intake manifold of an internal combustion engine comprising a housing adapted to be fastened to the said manifold and having a bore therethrough which is in fluid flow connection with the manifold, first and second throttle valves pivotally disposed in spaced relationship in the bore with the first valve nearest the said manifold, means for biasing said first throttle valve towards an open position, means responsive to movement of the first throttle valve for moving the second throttle valve towards an open position as the first thrOttle valve moves towards its closed position, said first throttle valve being disposed to be moved towards its closed position by air flow through the bore and said second throttle valve being disposed to be moved towards its open position by air flow through the bore, means responsive to the temperature of the engine for opposing movement of the first throttle valve away from its open position, said temperature reponsive means being adapted to require decreasingly less force for movement of the first throttle valve as the temperature of the engine increases, and means for introducing fuel into the bore between the two throttle valves.
Claim 17
Dependent Claim
29 words
The apparatus of claim 14 wherein the two throttle valves have spindles pivotally secured to the housing and a lever couples the two spindles together for simultaneous pivoting thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |