Patent US3742928A successfully refreshed from Google Patents.
US3742928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety throttle for internal combustion engines
Assignee: ZEAL CORP
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Filing: 1972-05-30
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Granted: 1973-07-03
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Expires: 1992-05-30
Abstract
Abstract A safety device for a throttle of the type which regulates a carburetor gas flow valve by means of a throttle cable fixedly connected at one end to a throttle lever and at its other end to a gas flow control valve and in which the cable normally moves reciprocally in a passageway as the throttle lever moves between open and closed positions. An ignition circuit safety switch is provided and safety switch control means are provided in the passageway out of contact with a cable moving in normal reciprocable fashion. For abnormal cable movement, however, the cable is distorted in the passageway causing the cable to strike the safety switch control means whereupon the safety switch operates to shut off or otherwise disable the engine controlled by the throttle. In one embodiment, the safety switch control means is also manually moveable into contact with the cable irrespective of the cable position or movement to provide for manual shutting off of the engine.
Inventors
- 👤 R Albertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:24
CPC Classifications
B; B62; B62K; B62K23/00; B62K23/02; F; F02; F02D; F02D11/00; F02D11/02; F02D17/00; F02D17/04; H; H01; H01H; H01H9/00; H01H9/02; H01H9/06; H01H2009/068
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
In combination with an internal combustion engine having a throttle cable fixedly connected at one end to a throttle control lever and at the other end to a gas flow control valve, and a passageway for said cable having a cross-section larger than said cable and in which the cable normally moves reciprocally as said throttle lever is moved between open and closed positions, an improved safety switch for enabling and disabling an ignition circuit of the engine comprising: a. switch control means having an electrical conductor mounted adjacent to and accessible from said passageway but disposed out of contact with said cable during normal reciprocal movement of said cable in said passageway but contactable by said cable when, upon movement of said throttle lever toward the closed position, movement of said cable in said passageway is inhibited to produce cable distortion which urges said cable into contact with said conductor, and b. means coupling said ignition circuit to said conductor whereby said ignition is grounded when said distorted cable is urged into contact with said conductor.
Claim 2
Dependent Claim
177 words
In combination with an internal combustion engine having a throttle cable fixedly connected at one end to a throttle control lever and at the other end to a gas flow control valve, and a passageway for said cable having a cross-section larger than said cable and in which the cable normally moves reciprocally as said throttle lever is moved between open and closed positions, an improved safety switch for enabling and disabling an ignition circuit of the engine comprising: a. switch control means having an electrical conductor mounted adjacent to and accessible from said passageway but disposed out of contact with said cable during normal reciprocal movement of said cable in said passageway but contactable by said cable when, upon movement of said throttle lever toward the closed position, movement of said cable in said passageway is inhibited to produce cable distortion which urges said cable into contact with said conductor, and b. means coupling said ignition circuit to said conductor whereby said ignition is grounded when said distorted cable is urged into contact with said conductor.
Claim 3
Dependent Claim
82 words
A safety switch as in claim 1 further comprising: a. means mounting said switch control means adjacent said passageway such that said conductor is moveable transverse to said passageway between a first position permitting striking of said conductor by said cable upon distortion of the cable and a second position wherein said conductor is manually projected into contact with said cable whereby grounding of said ignition can be manually effected by movement of said conductor from said first to said second position.
Claim 4
Dependent Claim
24 words
A safety switch as in claim 2 further comprising: a. means for electrically insulating said conductor from ground potential except through striking said cable.
Claim 5
Dependent Claim
30 words
A safety switch as in claim 3 further comprising: a. bias means urging said conductor to its first position whereby said conductor must be manually moved to its second position.
References Cited (Backward Citations)
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |