Patent US3760781A successfully refreshed from Google Patents.
US3760781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine safety system having safety assembly indentifiably operable for each combustion chamber
Assignee: Individual
•
Filing: 1971-03-26
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Granted: 1973-09-25
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Expires: 1991-03-26
Abstract
Abstract The safety system is for internal combustion engines, especially snowmobiles, having at least two combustion chambers; each combustion chamber is equipped with a safety assembly operable independently of the others. Each individual safety assembly includes a temperature sensor which is so mounted as to sense an unsafe operating temperature for the specific combustion chamber with which it is arranged. Preferred mounting of the sensor is at the exhaust port for the combustion chamber, or alternately in a position for reading temperatures from the base brass or copper gasket for the spark plug. In the preferred embodiment, the sensor automatically actuates a responsive switch means when unsafe operating temperatures are reached; and this serves to interrupt temporarily the intermittent electrical actuation of the ignition means or spark plug for the combustion chamber. The interruption lasts for the time the chamber is at the unsafe temperature. When the chamber returns to a safe temperature, the switch automatically serves to reinstate the intermittent electrical actuation of the spark means for it. Additionally, however, a separate manually-operated switch permits negation of the effect of the automatic interruption so as to reinstate spark ignition even when the individual combustion chamber is at the unsafe temperature. In an alternate embodiment, the temperature sensor actuates a responsive warning when an unsafe operating temperature for the chamber is reached. The warning may be such as to illuminate an instrument panel light or cause an audible sound (such as a buzzer) for the chamber. Thereafter, a manually-operated switch controlled by an operator may be shifted to terminate or interrupt temporarily the intermittent electrical actuation of the ignition means for the specific over-heated chamber.
Inventors
- 👤 G Boldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:02
CPC Classifications
F; F02; F02D; F02D17/00; F02D17/04; F02P; F02P11/00; F02P11/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
233 words
An internal combustion engine having at least two combustion chambers, each said combustion chamber having associated therewith an inlet for combustibleS, ignition means intermittently electrically actuated to ignite combustibles within said chamber, an exhaust outlet for products of combustion from said chamber, and a safety assembly, said safety assembly for each said combustion chamber being operable independently of the safety assembly for each and every other combustion chamber of said engine, and each said safety assembly comprising: a. A temperature sensor mounted to sense an unsafe operating temperature for the specific combustion chamber with which said sensor is associated, b. Responsive switch means automatically actuated by said sensor when said specific combustion chamber reaches said unsafe operating temperature, whereby said intermittent electrical actuation of said ignition means for said specific combustion chamber is interrupted during the time said specific combustion chamber is at said unsafe operating temperature, said responsive switch means being operable without interrupting the intermittent electrical actuation of the ignition means for all of the other combustion chambers of said engine, and c. manually operated switch means for negating the effect of said responsive switch means and thereby reinstating said intermittent electrical actuation of said ignition means for said specific combustion chamber, said manually operable switch means for each said combustion chamber safety assembly being identifiably distinct from the manually operated switch means for every other said combustion chamber safety assembly.
Claim 2
Dependent Claim
233 words
An internal combustion engine having at least two combustion chambers, each said combustion chamber having associated therewith an inlet for combustibleS, ignition means intermittently electrically actuated to ignite combustibles within said chamber, an exhaust outlet for products of combustion from said chamber, and a safety assembly, said safety assembly for each said combustion chamber being operable independently of the safety assembly for each and every other combustion chamber of said engine, and each said safety assembly comprising: a. A temperature sensor mounted to sense an unsafe operating temperature for the specific combustion chamber with which said sensor is associated, b. Responsive switch means automatically actuated by said sensor when said specific combustion chamber reaches said unsafe operating temperature, whereby said intermittent electrical actuation of said ignition means for said specific combustion chamber is interrupted during the time said specific combustion chamber is at said unsafe operating temperature, said responsive switch means being operable without interrupting the intermittent electrical actuation of the ignition means for all of the other combustion chambers of said engine, and c. manually operated switch means for negating the effect of said responsive switch means and thereby reinstating said intermittent electrical actuation of said ignition means for said specific combustion chamber, said manually operable switch means for each said combustion chamber safety assembly being identifiably distinct from the manually operated switch means for every other said combustion chamber safety assembly.
Claim 3
Dependent Claim
28 words
The engine of claim 1 wherein the mounting of said temperature sensor is such as to sense the temperature at the exhaust outlet for said specific combustion chamber.
Claim 4
Dependent Claim
31 words
The engine of claim 1 wherein the mounting of said temperature sensor is such as to sense the temperature at the base of the ignition means for said specific combustion chamber.
Claim 5
Dependent Claim
53 words
The engine of claim 1 wherein said safety assembly comprises a visual indicator automatically actuated by said sensor when said specific combustion chamber reaches said unsafe operating temperature, said visual indicator of each said combustion chamber safety assembly being identifiably distinct from the visual indicator for every other said combustion chamber safety assembly.
Claim 6
Dependent Claim
53 words
The engine of claim 1 wherein said safety assembly comprises an audible indicator automatically actuated by said sensor when said specific combustion chamber reaches said unsafe operating temperature, said audible indicator of each said combustion chamber safety assembly being identifiably distinct from the audible indicator for every other said combustion chamber safety assembly.
Claim 7
Dependent Claim
16 words
A mobile vehicle powered by an air-cooled internal combustion engine satisfying the requirements of claim 1.
Claim 8
Dependent Claim
198 words
An internal combustion engine having at least two combustion chambers, each said combustion chamber having associated therewith an inlet for combustibles, ignition means intermittently electrically actuated to ignite combustibles within said chamber, an exhaust outlet for products of combustion from said chamber, and a safety assembly, said safety assembly for each said combustion chamber being operable independently of the safety assembly for each and every other combustion chamber of said engine, and each said safety assembly comprising: a. A temperature sensor mounted to sense an unsafe operating temperature for the specific combustion chamber with which said sensor is associated, b. Responsive warning means automatically actuated by said sensor when said specific combustion chamber reaches said unsafe operating temperature, said responsive warning means being operable without interrupting the intermittent electrical actuation of said ignition means for said specific combustion chamber, and c. manually operated switch means for temporarily interrupting intermittent electrical actuation of said ignition means for said specific combustion chamber during the time said specific combustion chamber is at said unsafe operating temperature, Said switch means being operable without interrupting the intermittent electrical actuation of the ignition means for all of the other combustion chambers of said engine.
Claim 9
Dependent Claim
198 words
An internal combustion engine having at least two combustion chambers, each said combustion chamber having associated therewith an inlet for combustibles, ignition means intermittently electrically actuated to ignite combustibles within said chamber, an exhaust outlet for products of combustion from said chamber, and a safety assembly, said safety assembly for each said combustion chamber being operable independently of the safety assembly for each and every other combustion chamber of said engine, and each said safety assembly comprising: a. A temperature sensor mounted to sense an unsafe operating temperature for the specific combustion chamber with which said sensor is associated, b. Responsive warning means automatically actuated by said sensor when said specific combustion chamber reaches said unsafe operating temperature, said responsive warning means being operable without interrupting the intermittent electrical actuation of said ignition means for said specific combustion chamber, and c. manually operated switch means for temporarily interrupting intermittent electrical actuation of said ignition means for said specific combustion chamber during the time said specific combustion chamber is at said unsafe operating temperature, Said switch means being operable without interrupting the intermittent electrical actuation of the ignition means for all of the other combustion chambers of said engine.
Claim 10
Dependent Claim
28 words
The engine of claim 7 wherein the mounting of said temperature sensor is such as to sense the temperature at the exhaust outlet for said specific combustion chamber.
Claim 11
Dependent Claim
31 words
The engine of claim 7 wherein the mounting of said temperature sensor is such as to sense the temperature at the base of the ignition means for said specific combustion chamber.
Claim 12
Dependent Claim
18 words
The engine of claim 7 wherein said responsive warning means comprises a visual indicator for alerting an operator.
Claim 13
Dependent Claim
18 words
The engine of claim 7 wherein said responsive warning means comprises an audible indicator for alerting an operator.
Claim 14
Dependent Claim
17 words
A mobile vehicle powered by an air cooled internal combustion engine satisfying the requirements of claim 7.
References Cited (Backward Citations)
US1854571A
Cited
US2930365A
Cited
US2010960A
Cited
US2131264A
Cited
US2231845A
Cited
US2410998A
Cited
US2509400A
Cited
US2699161A
Cited
US3656101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |