Patent US4249488A successfully refreshed from Google Patents.
US4249488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve lift adjusting device
Assignee: Motors Liquidation Co
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Filing: 1978-09-14
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Granted: 1981-02-10
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Expires: 1998-09-14
Abstract
Abstract In an internal combustion engine having a rocker arm operated intake valve, there is provided a valve lift adjusting device that adjusts the fulcrum of the rocker arm between a full-lift position producing full valve lift and a partial-lift position producing partial intake valve lift. The valve lift adjusting device includes a selector member which selectively serves as a lift stop determining the full-lift position of the fulcrum, and alternatively, permits the fulcrum to engage another lift stop to determine the partial-lift position.
Inventors
- 👤 Donald C. Siegla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:12
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/0015; F01L13/0021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
246 words
In a valve arrangement having a poppet valve biased to close by a spring and forced to open against the spring by a lever, a valve lift adjusting device for selectively establishing full valve lift and partial valve lift comprising fixed support means, fulcrum means providing a fulcrum for the lever slidable along said support means between a full-lift position where movement of the lever effects full valve lift and a partial-lift position where the valve opening movement of the lever is reduced to thereby effect a predetermined partial valve lift, means for preventing turning of said fulcrum means while permitting its sliding movement, stop means supported in a fixed position on said support means, said fulcrum means having projecting lift determining means for engaging said stop means to stop said fulcrum means in said partial-lift position, spring means for yieldingly resisting movement of said fulcrum means to its partial-lift position during valve opening and urging return of said fulcrum means to its full-lift position during valve closing, and selector means supported in a fixed position on said support means intermediate said fulcrum means and said stop means for selective movement to a full-lift selector position for engagement by said projecting lift determining means to stop said fulcrum means in its full-lift position and movement to a partial-lift selector position permitting said projecting lift determing means to project therepast to engage said stop means to stop said fulcrum means in its partial-lift position during valve opening.
Claim 2
Dependent Claim
246 words
In a valve arrangement having a poppet valve biased to close by a spring and forced to open against the spring by a lever, a valve lift adjusting device for selectively establishing full valve lift and partial valve lift comprising fixed support means, fulcrum means providing a fulcrum for the lever slidable along said support means between a full-lift position where movement of the lever effects full valve lift and a partial-lift position where the valve opening movement of the lever is reduced to thereby effect a predetermined partial valve lift, means for preventing turning of said fulcrum means while permitting its sliding movement, stop means supported in a fixed position on said support means, said fulcrum means having projecting lift determining means for engaging said stop means to stop said fulcrum means in said partial-lift position, spring means for yieldingly resisting movement of said fulcrum means to its partial-lift position during valve opening and urging return of said fulcrum means to its full-lift position during valve closing, and selector means supported in a fixed position on said support means intermediate said fulcrum means and said stop means for selective movement to a full-lift selector position for engagement by said projecting lift determining means to stop said fulcrum means in its full-lift position and movement to a partial-lift selector position permitting said projecting lift determing means to project therepast to engage said stop means to stop said fulcrum means in its partial-lift position during valve opening.
Claim 3
Dependent Claim
259 words
In a valve arrangement having a poppet valve biased to close by a spring and forced to open against the spring by a lever, a valve lift adjusting device for selectively establishing full valve lift and partial valve lift comprising fixed support means, fulcrum means providing a fulcrum for the lever slidable along said support means between a full-lift position where movement of the lever effects full valve lift and a partial-lift position where the valve opening movement of the lever is reduced to thereby effect a predetermined partial valve lift, means for preventing turning of said fulcrum means while permitting its sliding movement, a stop plate supported by said support means, said fulcrum means having projecting lift determining means for engaging said stop plate to stop said fulcrum means in said partial-lift position, spring means for yieldingly resisting movement of said fulcrum means to its partial-lift position during valve opening and urging return of said fulcrum means to its full-lift position during valve closing, a selector plate having an aperture, and said selector plate supported by said support means intermediate said fulcrum means and said stop plate for selective movement to a partial-lift selector position aligning said aperture with said projecting lift determining means to permit said projecting lift determining means to project through said selector plate to engage said stop plate to stop said fulcrum means in its partial-lift position during valve opening and movement to a full-lift selector position for engagement by said projecting lift determining means to stop said fulcrum means in its full-lift position.
Claim 4
Dependent Claim
259 words
In a valve arrangement having a poppet valve biased to close by a spring and forced to open against the spring by a lever, a valve lift adjusting device for selectively establishing full valve lift and partial valve lift comprising fixed support means, fulcrum means providing a fulcrum for the lever slidable along said support means between a full-lift position where movement of the lever effects full valve lift and a partial-lift position where the valve opening movement of the lever is reduced to thereby effect a predetermined partial valve lift, means for preventing turning of said fulcrum means while permitting its sliding movement, a stop plate supported by said support means, said fulcrum means having projecting lift determining means for engaging said stop plate to stop said fulcrum means in said partial-lift position, spring means for yieldingly resisting movement of said fulcrum means to its partial-lift position during valve opening and urging return of said fulcrum means to its full-lift position during valve closing, a selector plate having an aperture, and said selector plate supported by said support means intermediate said fulcrum means and said stop plate for selective movement to a partial-lift selector position aligning said aperture with said projecting lift determining means to permit said projecting lift determining means to project through said selector plate to engage said stop plate to stop said fulcrum means in its partial-lift position during valve opening and movement to a full-lift selector position for engagement by said projecting lift determining means to stop said fulcrum means in its full-lift position.
References Cited (Backward Citations)
DE2621794A1
Cited
DE2648799A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |