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US3707953A Expired / Lapsed US ⏱️ 0.0 years remaining

Ignition timing controller for an engine

Assignee: Cooper Industries LLC
•
Filing: 1971-02-05
•
Granted: 1973-01-02
•
Expires: 1991-02-05
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Abstract

Abstract An internal combustion engine with variable spark ignition timing is provided with an air intake passage, an oil pressure system and a speed responsive device. To vary the ignition spark timing there is provided a housing enclosing primary and secondary levers connected to each other at one end by a link pivoted at opposite ends thereto. The primary lever has a fulcrum moved by the expansion of a chamber connected to the air intake passage and is in turn connected to a servo mechanism actuated by oil pressure and in turn varying the spark ignition timing. The secondary lever has a fixed fulcrum and at the other end from the link is connected to an expansible chamber responsive to the speed responsive device. In an alternate version the fixed fulcrum of the secondary lever is replaced by an expansible chamber connected to an engine temperature responsive device. In another version, the servo mechanism is overridden by a plunger responsive to the engine starting cycle. In a fuel injection engine, the servo mechanism output is connected to the fuel injection timer.

Inventors

  • 👤 W Rhoades
  • 👤 A Fleischer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 14:49
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/10; F02P5/103; F02P5/106

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 169 words
An ignition timing controller for an engine having an air intake passage, an engine speed responsive device, a lubricating oil pressure supply, and a variable spark timer comprising a primary lever, means forming a variable volume first cell with a movable first wall, means connecting the interior of said first cell to said air intake passage, means providing a first fulcrum connection between said first wall and said primary lever, means for connecting said primary lever to said variable spark timer including a servo mechanism, an actuating connection between said lubricating oil pressure supply and said servo mechanism, a secondary lever arranged substantially parallel to said primary lever, means providing a second fulcrum connection for said secondary lever, means forming a variable volume second cell with a movable second wall, means for connecting said second wall to said secondary lever, means connecting the interior of said second cell to said speed responsive device, and a link forming a pivot connection to said primary lever and to said secondary lever.
Claim 2
Dependent Claim 169 words
An ignition timing controller for an engine having an air intake passage, an engine speed responsive device, a lubricating oil pressure supply, and a variable spark timer comprising a primary lever, means forming a variable volume first cell with a movable first wall, means connecting the interior of said first cell to said air intake passage, means providing a first fulcrum connection between said first wall and said primary lever, means for connecting said primary lever to said variable spark timer including a servo mechanism, an actuating connection between said lubricating oil pressure supply and said servo mechanism, a secondary lever arranged substantially parallel to said primary lever, means providing a second fulcrum connection for said secondary lever, means forming a variable volume second cell with a movable second wall, means for connecting said second wall to said secondary lever, means connecting the interior of said second cell to said speed responsive device, and a link forming a pivot connection to said primary lever and to said secondary lever.
Claim 3
Dependent Claim 29 words
An ignition timing controller as in claim 1 including means in said servo mechanism for releasing oil from said lubricating oil pressure supply to said primary and secondary levers.
Claim 4
Dependent Claim 23 words
An ignition timing controller as in claim 1 including means for actuating said servo mechanism to urge said spark timer toward retard position.
Claim 5
Dependent Claim 30 words
An ignition timing controller as in claim 1 including a housing enclosing said primary and secondary levers and serving as a mounting for said first cell and said second cell.

References Cited (Backward Citations)

US1483883A Cited
US2670724A Cited
US2977946A Cited
US3370577A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-01-02 1976-07-03 1977-01-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-01-02 1980-07-03 1981-01-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-01-02 1984-07-03 1985-01-02 $7700.00 Window Closed / Lapsed

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