Patent US4252093A successfully refreshed from Google Patents.
US4252093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Individual
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Filing: 1977-08-08
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Granted: 1981-02-24
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Expires: 1997-08-08
Abstract
Abstract Internal combustion engine valve rocker arms adaptable for changing the horsepower output of an equipped engine, which rocker arms may be alternately set to prevent operation of the valves of cylinders that are to be selectively deactivated. Each rocker arm is formed of two radial members pivotally mounted to a common shaft that are joined together by a slidable key which may be shifted to a position in which the two radial members are disengaged from each other so that the first radial member reciprocated by the camshaft push rod does not transmit motion to the second radial member bearing on the valve lever. A latch device retains the second radial member of a conventional valve rocker arm in the open valve position, when the radial members are disengaged from each other.
Inventors
- 👤 Henry A. Hazelrigg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:38
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/12; F01L1/18; F01L1/181; F01L13/00; F01L13/0005; F01L2001/186; F01L2820/00; F01L2820/03; F01L2820/031
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
195 words
A rocker arm assembly adaptable for operation in an internal combustion engine in which a rocker arm unit is employed to transmit linear motion of a push rod to a valve stem to cause the valve stem to move in a linear direction, said rocker arm assembly fitted with means to alternatively engage or disengage the linkage between a said push rod and a said valve stem, when installed as a rocker arm unit of a said engine, in which the rocker arm assembly is formed of two arm members, each formed at a first end section with first means to rotatably fit about a common shaft, said first end section formed with second means to engage a common pin, each said second means located at a spaced similar distance from the center of rotation of said first means about a said shaft, such that with said second means engaged in both said first end sections, said two arm members are positively rotatably fixed with relation to each other in a position in which they each extend in opposed directions from said first means, when they are both rotatably mounted on a said common shaft.
Claim 2
Dependent Claim
195 words
A rocker arm assembly adaptable for operation in an internal combustion engine in which a rocker arm unit is employed to transmit linear motion of a push rod to a valve stem to cause the valve stem to move in a linear direction, said rocker arm assembly fitted with means to alternatively engage or disengage the linkage between a said push rod and a said valve stem, when installed as a rocker arm unit of a said engine, in which the rocker arm assembly is formed of two arm members, each formed at a first end section with first means to rotatably fit about a common shaft, said first end section formed with second means to engage a common pin, each said second means located at a spaced similar distance from the center of rotation of said first means about a said shaft, such that with said second means engaged in both said first end sections, said two arm members are positively rotatably fixed with relation to each other in a position in which they each extend in opposed directions from said first means, when they are both rotatably mounted on a said common shaft.
Claim 3
Dependent Claim
50 words
The combination as recited in claim 1 together with third means to disengage the common pin from the second means of at least one arm member so that with both arm members rotatably mounted on a common shaft, they are free to rotate independently of each other about said shaft.
Claim 4
Dependent Claim
67 words
An internal combustion engine in which a rocker arm assembly as recited in claim 2 is mounted to link a first push rod with the valve stem of an intake valve of a specific engine cylinder, so with that the common pin disengaged from the second means of at least one arm member, the said intake valve remains in the closed position during operation of the engine.
Claim 5
Dependent Claim
117 words
The internal combustion engine as recited in claim 3 in which the exhaust valve stem of the said specific engine cylinder is linked to a second push rod by a rocker arm formed of two arm members fixed to a common intermediate section of the rocker arm, together with selective latch means to latch the said rocker arm in a latched position in which one said arm member maintains the said valve stem in the open position of the exhaust valve during operation of the engine, said latch means being mounted to the engine block in a location so as to be free of engagement with the rocker arm in the unlatched position of the latch means.
Claim 6
Dependent Claim
99 words
The engine as recited in claim 4, together with first electrical means to control the said third means that serves to disengage the common pin, and second electrical means to control the latch means, together with control means responsive to the intake vacuum and temperature of the engine, which control means operates said first and second electrical means to maintain an intake valve in the closed position and an exhaust valve in the open position of a specific engine cylinder when the engine, is in operation during periods of low engine power demand and at a suitable engine temperature.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |