US3780713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum-operated spark advance device
Assignee: Motors Liquidation Co
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Filing: 1972-09-05
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Granted: 1973-12-25
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Expires: 1992-09-05
Abstract
Abstract A spark advance device for an automobile ignition system having a pair of axially spaced vacuum operated actuators each of which houses a spring-biased diaphragm dividing the housing into a vacuum chamber and an atmospheric pressure chamber. The diaphragms of both actuators are adapted to move in the same direction when vacuum is applied to either actuator and the diaphragm of one actuator is connected to the housing of the other actuator while the diaphragm of the latter mentioned actuator has a control rod connected to the distributor of the ignition system. The arrangement is such that when vacuum is sequentially applied to the actuators, the control rod initially moves a predetermined distance to advance the spark and subsequently moves a further distance in the same direction to further advance the spark.
Inventors
- 👤 C Julian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:01
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/10; F02P5/103
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
263 words
A device adapted to be connected to an ignition distributor for varying the timing of the spark of an internal combustion engine, said device comprising a pair of vacuum-operated actuators located in tandem and axially spaced along a longitudinal axis, each of said actuators including a housing having a spring biased diaphragm dividing the housing into a first chamber adapted to be connected with a source of vacuum and a second chamber at atmospheric pressure, the first chambers of said actuators being so positioned relative to each other that the diaphragm of each actuator moves in the same direction when vacuum is applied to either of said first chambers, a first rod located along said longitudinal axis and having one end thereof adapted to be connected to the ignition distributor and the other end connected to the diaphragm of one of the actuators, a second rod axially aligned with the first rod and connecting thE diaphragm of the other of the actuators to the housing of said one of the actuators so the latter actuator is moved as a unit together with the rod when the first chamber of the other of the actuators is connected to the source of vacuum, the first chambers of said actuators adapted to be successively connected with said source of vacuum so as to cause the rod to initially move in one direction to a first point to vary the timing of the spark and subsequently move in the same direction from said first point to a second point to further vary the timing of the spark.
Claim 2
Independent Claim
263 words
A device adapted to be connected to an ignition distributor for varying the timing of the spark of an internal combustion engine, said device comprising a pair of vacuum-operated actuators located in tandem and axially spaced along a longitudinal axis, each of said actuators including a housing having a spring biased diaphragm dividing the housing into a first chamber adapted to be connected with a source of vacuum and a second chamber at atmospheric pressure, the first chambers of said actuators being so positioned relative to each other that the diaphragm of each actuator moves in the same direction when vacuum is applied to either of said first chambers, a first rod located along said longitudinal axis and having one end thereof adapted to be connected to the ignition distributor and the other end connected to the diaphragm of one of the actuators, a second rod axially aligned with the first rod and connecting thE diaphragm of the other of the actuators to the housing of said one of the actuators so the latter actuator is moved as a unit together with the rod when the first chamber of the other of the actuators is connected to the source of vacuum, the first chambers of said actuators adapted to be successively connected with said source of vacuum so as to cause the rod to initially move in one direction to a first point to vary the timing of the spark and subsequently move in the same direction from said first point to a second point to further vary the timing of the spark.
Claim 3
Dependent Claim
310 words
A vacuum-operated spark advance device adapted to be connected to an ignition distributor of an internal combustion engine, said device comprising first and second actuators located in tandem along a longitudinal axis, said first actuator including a housing divided into first, second, and third chambers axially spaced along said longitudinal axis, a spring-biased diaphragm separating the first and second chambers and a rigid plate separating the second and third chambers, said first chamber adapted to be connected with a source of vacuum and the second and third chambers being at atmospheric pressure, said second actuator being located in said third chamber and having a housing divided by a spring-biased diaphragm into a first chamber adapted to be connected with said source of vacuum and a second chamber at atmospheric pressure, the first chambers of said first and second actuators being so positioned relative to each other that the diaphragm of each actuator moves in the same direction when vacuum is applied to either of said first chambers, a rod having one end thereof rigidly connected to the diaphragm of the second actuator, the other end of the rod extending through the housing of said first actuator and adapted to be connected to the ignition distributor, means connecting the diaphragm of said first actuator to the housing of said second actuator so the first actuator is moved as a unit together with the rod when the first chamber of the second actuator is connected to the source of vacuum, the first chambers of said actuators adapted to be successively connected with said source of vacuum so as to cause the rod to initially move in one direction to a first point to vary the timing of the spark and subsequently move in the same direction from said first point to a second point to further vary the timing of the spark.
Claim 4
Dependent Claim
310 words
A vacuum-operated spark advance device adapted to be connected to an ignition distributor of an internal combustion engine, said device comprising first and second actuators located in tandem along a longitudinal axis, said first actuator including a housing divided into first, second, and third chambers axially spaced along said longitudinal axis, a spring-biased diaphragm separating the first and second chambers and a rigid plate separating the second and third chambers, said first chamber adapted to be connected with a source of vacuum and the second and third chambers being at atmospheric pressure, said second actuator being located in said third chamber and having a housing divided by a spring-biased diaphragm into a first chamber adapted to be connected with said source of vacuum and a second chamber at atmospheric pressure, the first chambers of said first and second actuators being so positioned relative to each other that the diaphragm of each actuator moves in the same direction when vacuum is applied to either of said first chambers, a rod having one end thereof rigidly connected to the diaphragm of the second actuator, the other end of the rod extending through the housing of said first actuator and adapted to be connected to the ignition distributor, means connecting the diaphragm of said first actuator to the housing of said second actuator so the first actuator is moved as a unit together with the rod when the first chamber of the second actuator is connected to the source of vacuum, the first chambers of said actuators adapted to be successively connected with said source of vacuum so as to cause the rod to initially move in one direction to a first point to vary the timing of the spark and subsequently move in the same direction from said first point to a second point to further vary the timing of the spark.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |