Patent US3250736A successfully refreshed from Google Patents.
US4445470A
Expired / Lapsed
US
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Oil injection warning system
Assignee: Brunswick Corp
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Filing: 1982-12-27
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Granted: 1984-05-01
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Expires: 2002-12-27
Abstract
Abstract A two-cycle engine having an oil pump (19) driven by the engine crankshaft (11) to supply lubricant to the carburetor (12) has an alarm system to warn of an interruption of the oil pump drive. The alarm system has a signal processor (23) connected to activate an alarm (27) should signals from an oil pump rotation sensor (26) be interrupted, if a level switch (28) in the oil tank (20) indicates a low oil level, or should a signal from the ignition system (14) be interrupted. The signal processor (23) is also connected to briefly activate the alarm (27) when the engine is started to provide a test of the alarm system.
Inventors
- 👤 Cary J. Chmielewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:28
CPC Classifications
F; F01; F01M; F01M11/00; F01M11/10; F01M3/00; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
119 words
An alarm system for a two-cycle internal combustion engine using a mechanically driven oil pump to provide oil from an oil reservoir to said engine for engine lubrication, said alarm system comprising: (A) an alarm means; (B) a means to sense the operation of said oil pump and provide a signal indicative of the speed of operation of said pump; (C) a means to sense to operation of said engine and provide a signal indicative of the speed of operation of said engine; and (D) a signal processing means connected to receive said pump signal and said engine signal and produce an alarm signal to activate said alarm if said pump and engine signals differ from a predetermined relationship.
Claim 2
Dependent Claim
119 words
An alarm system for a two-cycle internal combustion engine using a mechanically driven oil pump to provide oil from an oil reservoir to said engine for engine lubrication, said alarm system comprising: (A) an alarm means; (B) a means to sense the operation of said oil pump and provide a signal indicative of the speed of operation of said pump; (C) a means to sense to operation of said engine and provide a signal indicative of the speed of operation of said engine; and (D) a signal processing means connected to receive said pump signal and said engine signal and produce an alarm signal to activate said alarm if said pump and engine signals differ from a predetermined relationship.
Claim 3
Dependent Claim
60 words
The alarm system defined in claim 1 further comprising an engine starting switch to provide a starting signal when said switch is turned on, and said signal processing means is connected to receive said starting signal and includes means to produce a test signal to actuate said alarm for a fixed period of time when said switch is turned on.
Claim 4
Dependent Claim
34 words
The alarm system defined in claim 2 wherein said signal processing means includes means to continue the activation of said alarm, when said alarm signal is received, until said starting switch is turned off.
Claim 5
Dependent Claim
64 words
The alarm system defined in claim 3 further comprising an oil level sensor to sense the level of oil in said reservoir and produce a signal indicating a low oil level in said reservoir and said signal processing means is connected to receive said low oil level signal and includes means to produce said alarm signal when said low oil level signal is provided.
Claim 6
Dependent Claim
133 words
An alarm system for a two-cycle internal combustion engine having an output shaft and an oil pump to provide oil from a reservoir to said engine, said oil pump driven by a pump shaft, said pump shaft driven by said output shaft at a fixed speed ratio to the speed of said output shaft, said alarm system comprising: (A) an alarm means; (B) a rotation sensor coupled to said pump shaft to produce a pump output pulse for every revolution of said pump shaft; (C) an engine speed sensor to produce an engine output pulse from every revolution of said output shaft; and (D) a sequential logic circuit connected to receive said output pulses and produce an alarm signal to activate said alarm if said output pulses differ from a predetermined sequential relationship.
Claim 7
Dependent Claim
133 words
An alarm system for a two-cycle internal combustion engine having an output shaft and an oil pump to provide oil from a reservoir to said engine, said oil pump driven by a pump shaft, said pump shaft driven by said output shaft at a fixed speed ratio to the speed of said output shaft, said alarm system comprising: (A) an alarm means; (B) a rotation sensor coupled to said pump shaft to produce a pump output pulse for every revolution of said pump shaft; (C) an engine speed sensor to produce an engine output pulse from every revolution of said output shaft; and (D) a sequential logic circuit connected to receive said output pulses and produce an alarm signal to activate said alarm if said output pulses differ from a predetermined sequential relationship.
Claim 8
Dependent Claim
47 words
The alarm system defined in claim 5 wherein said rotation sensor includes a magnet mounted on said pump shaft and a Hall switch mounted on said engine adjacent said pump shaft to produce said pump output pulse when one pole of said magnet passes said Hall switch.
Claim 9
Dependent Claim
49 words
The alarm system defined in claim 5 wherein said engine includes an electrical circuit for providing an operating pulse for each revolution of said engine to provide an engine operating function and wherein said engine speed sensor is connected to said electrical circuit to produce said engine output pulse.
Claim 10
Dependent Claim
51 words
The alarm system defined in claim 5 further comprising an oil level sensor to sense the level of oil in said reservoir, said oil level sensor including a switch which operates when the level of oil in said reservoir is low to interrupt said pump output pulse from said rotation sensor.
Claim 11
Dependent Claim
21 words
The alarm system defined in claim 5 wherein said sequential logic circuit includes an oscillator to make said alarm signal intermittent.
Claim 12
Dependent Claim
78 words
The alarm system defined in claim 9 wherein said engine includes an engine starting switch to start said engine and supply power to said alarm system and wherein said alarm system includes means to supply a starting signal to said logic circuit when power is initailly received from said starting switch and said logic circuit includes means to produce a test signal to activate said alarm for a fixed period of time in response to said test signal.
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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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |