Patent US3575385A successfully refreshed from Google Patents.
US3575385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Throttle linkage mechanism for a multistage carburetor
Assignee: Carter Automotive Co Inc
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Filing: 1969-04-10
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Granted: 1971-04-20
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Expires: 1989-04-10
Abstract
Abstract Lever and linkage mechanism are disclosed for the sequential operation of the throttle of a two stage carburetor. When the engine is cold and the choke is in operation, only the primary throttle is operative. When the choke is fully opened, a latch or dog on the secondary side is released by the choke mechanism whereby the latch engages a loose lever driven by the primary throttle to complete the connection between the primary throttle and the secondary throttle, thereby causing the secondary throttle to open on demand.
Inventors
- 👤 Jesse L Szwargulski
- 👤 Robert J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:39
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/02; F02M11/00; F02M11/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
232 words
In a multistage carburetor having a choke valve, a primary throttle moveable by a primary throttle shaft and a secondary throttle moveable by a secondary throttle shaft, lever and linkage mechanism for the sequential operation of said shafts as a function of engine temperature comprising: A. an idle arm pivoted at its center and having a first end linked with a lever indicative of choke position, B. a primary throttle lever fixed to said primary throttle shaft and having a pickup tab struck out from said lever, C. a primary loose lever on said primary throttle shaft and having pickup and return means engageable by said pickup tab, D. a secondary loose lever on said secondary shaft and having an operating tang at one side thereof, E. connecting means for connecting said primary loose lever with said secondary loose lever, F. a secondary throttle lever fixed to said secondary throttle shaft, said secondary lever having a latching means pivoted thereon, said latching means being engageable with saiD operating tang, and G. engagement means on said idle arm for moving said latching means into engagement with said operating tang when said choke is fully open and for preventing such engagement when the said choke is partially closed whereby the said secondary throttle can be opened when said choke is open but will not be opened when said choke is at least partially closed.
Claim 2
Dependent Claim
232 words
In a multistage carburetor having a choke valve, a primary throttle moveable by a primary throttle shaft and a secondary throttle moveable by a secondary throttle shaft, lever and linkage mechanism for the sequential operation of said shafts as a function of engine temperature comprising: A. an idle arm pivoted at its center and having a first end linked with a lever indicative of choke position, B. a primary throttle lever fixed to said primary throttle shaft and having a pickup tab struck out from said lever, C. a primary loose lever on said primary throttle shaft and having pickup and return means engageable by said pickup tab, D. a secondary loose lever on said secondary shaft and having an operating tang at one side thereof, E. connecting means for connecting said primary loose lever with said secondary loose lever, F. a secondary throttle lever fixed to said secondary throttle shaft, said secondary lever having a latching means pivoted thereon, said latching means being engageable with saiD operating tang, and G. engagement means on said idle arm for moving said latching means into engagement with said operating tang when said choke is fully open and for preventing such engagement when the said choke is partially closed whereby the said secondary throttle can be opened when said choke is open but will not be opened when said choke is at least partially closed.
Claim 3
Dependent Claim
64 words
A carburetor according to claim 1 including a fast idle cam fixed to said primary throttle shaft, a fast idle cam surface on said cam, an engagement surface opposite said cam surface, and a tab on a second end of said idle arm, said tab contacting said fast idle surface when said choke is not fully open whereby to partially open said primary throttle.
Claim 4
Dependent Claim
64 words
A carburetor according to claim 2 including an unloading tab on said idle arm, said unloading tab being located on said idle arm on the same side of the pivot as the said second end, said unloading tab being engageable by said unloading surface when said primary throttle is in a fully open position to thereby open said choke at least a small amount.
Claim 5
Dependent Claim
97 words
A carburetor according to claim 2 including an accelerating pump operating lever loosely mounted on said primary throttle shaft, said operating lever being connected at one end to an accelerating pump of the said carburetor, said operating lever having a tab at its other end, said fast idle cam having a pump control surface engageable with said operating lever tab, said control surface acting to move said pump in a direction to fill said pump when the said primary throttle is closed and to move away from said operating lever tab when said primary throttle is opened.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |