US3738623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm carburetor
Assignee: Walbro Corp
•
Filing: 1971-01-13
•
Granted: 1973-06-12
•
Expires: 1991-01-13
Abstract
Abstract A diaphragm-controlled carburetor having a pressure pump actuated by engine pulses wherein a pump diaphragm is supported by a pan-shaped side mount spring to assist pressure pulses of the engine in a manner to improve the pump efficiency at both low speed and high speed conditions.
Inventors
- 👤 C Tuckey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:12
CPC Classifications
F; F02; F02M; F02M17/00; F02M17/02; F02M17/04; Y; Y10; Y10S; Y10S261/00; Y10S261/68
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
A fuel pump for use in a diaphragm-controlled carburetor comprising: a. a first carburetor section having a pump chamber formed therein, b. a second carburetor section overlying the first section having a pump chamber formed therein, c. a diaphragm lying between said sections having its periphery captured therebetween and dividing said recess formed by said chambers into a pumping chamber to be connected to a source of fuel and a pulse chamber for receiving pulses from an engine crankcase, and d. a spring assist member lying against the diaphragm on the pulse chamber side of said diaphragm comprising a circularly shaped resilient member overlying a substantial portion of the area of said diaphragm only at the center thereof and an integral, co-planar, radial extension from said member having a distal end clamped between said sections, the said member serving as the sole resilient force on the said diaphragm by reason of the inherent resilience of said radial extension.
Claim 2
Dependent Claim
158 words
A fuel pump for use in a diaphragm-controlled carburetor comprising: a. a first carburetor section having a pump chamber formed therein, b. a second carburetor section overlying the first section having a pump chamber formed therein, c. a diaphragm lying between said sections having its periphery captured therebetween and dividing said recess formed by said chambers into a pumping chamber to be connected to a source of fuel and a pulse chamber for receiving pulses from an engine crankcase, and d. a spring assist member lying against the diaphragm on the pulse chamber side of said diaphragm comprising a circularly shaped resilient member overlying a substantial portion of the area of said diaphragm only at the center thereof and an integral, co-planar, radial extension from said member having a distal end clamped between said sections, the said member serving as the sole resilient force on the said diaphragm by reason of the inherent resilience of said radial extension.
Claim 3
Dependent Claim
135 words
A fuel pump for use in a diaphragm-controlled carburetor comprising: a. a carburetor body having a pump chamber, b. a diaphragm lying across said chamber to divide the chamber into a pulse chamber to receive pulses from an engine crankcase and a pumping chamber to be connected to a source of fuel, c. a spring assist member lying on the pulse chamber side of said diaphragm comprising a circularly shaped member overlying and in contact with a substantial portion of the area of said diaphragm only at the center thereof, and d. resilient means forming an integral part of said member co-planar therewith and extending radially from said member and rigidly mounted in said body to support said member in said chamber, the said resilient means serving as the sole resilient force on the diaphragm.
Claim 4
Dependent Claim
135 words
A fuel pump for use in a diaphragm-controlled carburetor comprising: a. a carburetor body having a pump chamber, b. a diaphragm lying across said chamber to divide the chamber into a pulse chamber to receive pulses from an engine crankcase and a pumping chamber to be connected to a source of fuel, c. a spring assist member lying on the pulse chamber side of said diaphragm comprising a circularly shaped member overlying and in contact with a substantial portion of the area of said diaphragm only at the center thereof, and d. resilient means forming an integral part of said member co-planar therewith and extending radially from said member and rigidly mounted in said body to support said member in said chamber, the said resilient means serving as the sole resilient force on the diaphragm.
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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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |