Patent US3662727A successfully refreshed from Google Patents.
US3662727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocking circuit for inboard engine ignition
Assignee: Individual
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Filing: 1970-10-12
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Granted: 1972-05-16
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Expires: 1990-10-12
Abstract
Abstract A blocking circuit is provided in combination with an inboard motorboat engine, blower and ignition circuit, which prevents actuation of the ignition circuit until after the blower has functioned for a certain length of time to expel the fumes from the engine compartment. A bimetallic switch, a timer motor, or a switching circuit is utilized to open and close the leads to the ignition circuit. In the embodiment featuring the bimetallic switch, either a pair of alternately operating heating coils cause the switch to transfer from activating the blower to connecting the ignition circuit to the operator''s switch, or a single coil by itself or in parallel with the solenoid supply this function.
Inventors
- 👤 George W Abplanalp
- 👤 Steve Corson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:31
CPC Classifications
F; F02; F02P; F02P11/00; F02P11/04; F02N; F02N15/00; F02N15/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
338 words
In a motorboat having an engine compartment, an engine, an ignition system for said engine, a power supply for said ignition system, a blower for ventilating said engine compartment and a blocking circuit connected in a circuit between said power supply and said ignition system to ensure operation of said blower for a predetermined time prior to operation of said engine, the improvement in said blocking circuit comprising: a time-delay relay having a coil and a pair of normally open contact elements; an air-actuated switch having a pair of normally open contact elements, closable in response to the operation of said blower; a magnetic relay having a coil, a second pair of normally open contacts, and a pair of normally closed contacts; a pressure-sensing switch having a pair of normally open contacts responsive to operation of said engine; first circuit means connecting said power supply to one of said pair of contacts on said time-delay switch being connected to said coil of said magnetic relay; second circuit means connecting said power supply to one of said pair of normally closed contacts on said magnetic relay; third circuit means connecting the other of said pair of normally closed contacts on said magnetic relay to said blower and to one of said air-switch contacts; fourth circuit means connecting the other of said air-switch contacts to one of said pressure switch contacts and to said time-delay relay coil; and fifth circuit means connecting the other of said pressure-switch contacts to said normally open contact on said magnetic relay and to said power supply, the other of said normally open contacts on said magnetic relay being connected to said ignition system; whereby operation of said blower closes said air switch thereby connecting said power supply to the coil of said time-delay relay, said time-delay relay coils remaining normally open for a predetermined time after such connection whereupon said time delay relay contacts close thereby energizing said magnetic relay to open said circuit to said blower and close said circuit to said ignition.
Claim 2
Dependent Claim
338 words
In a motorboat having an engine compartment, an engine, an ignition system for said engine, a power supply for said ignition system, a blower for ventilating said engine compartment and a blocking circuit connected in a circuit between said power supply and said ignition system to ensure operation of said blower for a predetermined time prior to operation of said engine, the improvement in said blocking circuit comprising: a time-delay relay having a coil and a pair of normally open contact elements; an air-actuated switch having a pair of normally open contact elements, closable in response to the operation of said blower; a magnetic relay having a coil, a second pair of normally open contacts, and a pair of normally closed contacts; a pressure-sensing switch having a pair of normally open contacts responsive to operation of said engine; first circuit means connecting said power supply to one of said pair of contacts on said time-delay switch being connected to said coil of said magnetic relay; second circuit means connecting said power supply to one of said pair of normally closed contacts on said magnetic relay; third circuit means connecting the other of said pair of normally closed contacts on said magnetic relay to said blower and to one of said air-switch contacts; fourth circuit means connecting the other of said air-switch contacts to one of said pressure switch contacts and to said time-delay relay coil; and fifth circuit means connecting the other of said pressure-switch contacts to said normally open contact on said magnetic relay and to said power supply, the other of said normally open contacts on said magnetic relay being connected to said ignition system; whereby operation of said blower closes said air switch thereby connecting said power supply to the coil of said time-delay relay, said time-delay relay coils remaining normally open for a predetermined time after such connection whereupon said time delay relay contacts close thereby energizing said magnetic relay to open said circuit to said blower and close said circuit to said ignition.
Claim 3
Dependent Claim
40 words
The blocking circuit defined in claim 1 wherein operation of said engine closes said pressure switch contacts connecting said power supply to said time-delay relay coil thereby holding said time-delay relay contacts in closed position maintaining said magnetic relay energized.
Claim 4
Dependent Claim
46 words
The blocking circuit defined in claim 1 and further comprising a selector switch having a movable switching element therein connected in circuit with said first and said fifth circuit means to selectively connect said power supply to either of said first and said fifth circuit means.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |