Patent US3978839A successfully refreshed from Google Patents.
US3978839A
Expired / Lapsed
US
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Primer system for internal combustion engine
Assignee: Outboard Marine Corp
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Filing: 1974-12-18
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Granted: 1976-09-07
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Expires: 1994-12-18
Abstract
Abstract Disclosed herein is an internal combustion engine including a cylinder having a head end, a piston reciprocal in the cylinder relative to the head end, a port communicating with the cylinder in spaced relation to the head end and subject to pressure variation in response to piston reciprocation, a manually operable primer pump communicating with the port for pumping primer fuel into the cylinder through the port, and a fuel pump including a pulse chamber defined in part by a diaphram communicating with the port and operable in response to pressure variation to effect fuel pumping operation.
Inventors
- 👤 Chester G. DuBois
- 👤 Howard M. Pollari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:41
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/16; F02M37/00; F02M37/04; F02M37/12; F02B; F02B2275/00; F02B2275/14; Y; Y10; Y10S; Y10S261/00; Y10S261/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
107 words
An internal combustion engine including a cylinder having a head end, a piston reciprocal in said cylinder relative to said head end, a port communicating with said cylinder in spaced relation to said head end and subject to pressure variation occurring in response to piston reciprocation, conduit means communicating with said port, a pressure operated fuel pump including a diaphragm defining a pulse chamber communicating with said conduit means and a pumping chamber operable in response to pressure variation in said pulse chamber to effect fuel pumping, and manually operable primer pump means communicating with said port for pumping primer fuel into said cylinder through said port.
Claim 2
Dependent Claim
107 words
An internal combustion engine including a cylinder having a head end, a piston reciprocal in said cylinder relative to said head end, a port communicating with said cylinder in spaced relation to said head end and subject to pressure variation occurring in response to piston reciprocation, conduit means communicating with said port, a pressure operated fuel pump including a diaphragm defining a pulse chamber communicating with said conduit means and a pumping chamber operable in response to pressure variation in said pulse chamber to effect fuel pumping, and manually operable primer pump means communicating with said port for pumping primer fuel into said cylinder through said port.
Claim 3
Dependent Claim
22 words
An internal combustion engine in accordance with claim 1 wherein said primer pump means communicates with said port through said conduit means.
Claim 4
Dependent Claim
26 words
An internal combustion engine in accordance with claim 1 wherein said primer pump means communicates with said port through said conduit means and said pulse chamber.
Claim 5
Dependent Claim
63 words
An internal combustion engine in accordance with claim 1 and further including a crankcase extending from said cylinder, and a transfer passage extending between said crankcase and said cylinder and operable to provide communication between said crankcase and said cylinder when said piston is spaced from said cylinder head end, and wherein said port communicates with said transfer passage adjacent to said cylinder.
Claim 6
Dependent Claim
62 words
An internal combustion engine in accordance with claim 1 wherein said cylinder includes a side wall having therein an exhaust port spaced from said cylinder head end and wherein said port subject to pressure variation is located in said side wall at a distance from said cylinder head end less than the distance of said exhaust port from said cylinder head end.
Claim 7
Dependent Claim
50 words
An internal combustion engine in accordance with claim 1 including a one-way valve means located between said port subject to pressure variation and said primer pump means for permitting flow from said primer pump means to said cylinder and for preventing flow from said cylinder to said primer pump means.
Claim 8
Dependent Claim
102 words
An internal combustion engine including a combustion chamber, a piston movable in said combustion chamber to vary the pressure in said chamber, a port communicating with said combustion chamber and subject to pressure variation occurring in response to piston movement, conduit means communicating with said port, a pressure operated fuel pump including a diaphragm defining a pulse chamber communicating with said conduit means and a pumping chamber operable in response to pressure variation in said pulse chamber to effect fuel pumping, and manually operable primer pump means communicating with said port for pumping primer fuel into said combustion chamber through said port.
Claim 9
Dependent Claim
102 words
An internal combustion engine including a combustion chamber, a piston movable in said combustion chamber to vary the pressure in said chamber, a port communicating with said combustion chamber and subject to pressure variation occurring in response to piston movement, conduit means communicating with said port, a pressure operated fuel pump including a diaphragm defining a pulse chamber communicating with said conduit means and a pumping chamber operable in response to pressure variation in said pulse chamber to effect fuel pumping, and manually operable primer pump means communicating with said port for pumping primer fuel into said combustion chamber through said port.
Claim 10
Dependent Claim
22 words
An internal combustion engine in accordance with claim 7 wherein said primer pump means communicates with said port through said conduit means.
Claim 11
Dependent Claim
26 words
An internal combustion engine in accordance with claim 7 wherein said primer pump means communicates with said port through said conduit means and said pulse chamber.
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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |