US3782354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic compression relief valve
Assignee: Walbro Corp
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Filing: 1972-05-05
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Granted: 1974-01-01
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Expires: 1992-05-05
Abstract
Abstract An automatic compression relief valve which opens an engine cylinder to atmosphere for starting and closes in response to cylinder pressure under normal operating conditions. The relief valve includes a hollow body having a screw-end to fasten into a cylinder wall, a valve passage and seat at the cylinder end of the valve body leading to a vent in the body, a cup-like piston positioned in the body with the open end facing away from the cylinder and valve seat, and a valve projection at the valve seat end of the cup having a perforation to the inside of the cup so that pressure in the cylinder will move the cup against a spring bias to close the valve seat from the vent during engine operation.
Inventors
- 👤 C Tuckey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:10
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
225 words
A relief vent control means for internal combustion engines for the reduction of compression pressure to reduce torque requirements for engine turn-over during starting which comprises: a. a valve body having an inner end portion to mount in a wall of an engine cylinder, said body having a cylindrical chamber closed at the outer end, b. a passage formed at the inner end portion leading to the interior of an engine cylinder and an atmospheric vent opening formed in the wall of said chamber spaced from said passage, c. means forming a valve seat at the chamber end of said passage, d. a piston having a sliding fit in said chamber formed as a cup with the open end of the cup facing away from said valve seat and dimensioned to move axially in said chamber, e. means in the bottom of said cup engageable with said valve seat to close said seat in one position of said piston, f. an orifice formed in said cup bottom exposed to said passage and open to the interior of said cup, and g. means biasing said cup away from said seat, said orifice serving to admit pressure from said passage to the interior of said cup to cause said cup to move against said bias to close said passage and block said passage from said vent opening.
Claim 2
Dependent Claim
225 words
A relief vent control means for internal combustion engines for the reduction of compression pressure to reduce torque requirements for engine turn-over during starting which comprises: a. a valve body having an inner end portion to mount in a wall of an engine cylinder, said body having a cylindrical chamber closed at the outer end, b. a passage formed at the inner end portion leading to the interior of an engine cylinder and an atmospheric vent opening formed in the wall of said chamber spaced from said passage, c. means forming a valve seat at the chamber end of said passage, d. a piston having a sliding fit in said chamber formed as a cup with the open end of the cup facing away from said valve seat and dimensioned to move axially in said chamber, e. means in the bottom of said cup engageable with said valve seat to close said seat in one position of said piston, f. an orifice formed in said cup bottom exposed to said passage and open to the interior of said cup, and g. means biasing said cup away from said seat, said orifice serving to admit pressure from said passage to the interior of said cup to cause said cup to move against said bias to close said passage and block said passage from said vent opening.
Claim 3
Dependent Claim
54 words
A relief vent control means for internal combustion engines as defined in claim 1 in which the means on the bottom of said cup comprises a perforate projection having a tip portion within and concentric to said passage and a portion movable into contact with said seat to close said passage from said vent.
Claim 4
Dependent Claim
64 words
A relief vent control means for internal combustion engines as defined in claim 1 in which the means on the bottom of the cup comprises a projection having an ensmalled tip portion within and concentric to said passage and a concentric larger portion movable into engagement with said seat upon shifting of said cup toward said passage to close said passage from said vent.
Claim 5
Dependent Claim
165 words
A relief vent control means for internal combustion engines to relieve compression during starting turnover which comprises: a. first chamber means mountable in an engine cylinder wall in communication with the interior of the cylinder and having a cylindrical chamber extending away from the engine cylinder with an atmospheric vent in the chamber positioned relatively close to said engine cylinder, b. a piston movable in and exposed to said cylindrical chamber having means to close said vent from the interior of said engine cylinder when in the first of two positions, c. means biasing the piston to a second position in which said vent is open, and d. means forming a restricted passage to connect the interior of said chamber on the side of the piston opposite the engine cylinder to the interior of the engine cylinder on which said chamber means is mounted whereby firing pressure in the engine cylinder will develop pressure in said chamber and move said piston to said first position.
Claim 6
Dependent Claim
165 words
A relief vent control means for internal combustion engines to relieve compression during starting turnover which comprises: a. first chamber means mountable in an engine cylinder wall in communication with the interior of the cylinder and having a cylindrical chamber extending away from the engine cylinder with an atmospheric vent in the chamber positioned relatively close to said engine cylinder, b. a piston movable in and exposed to said cylindrical chamber having means to close said vent from the interior of said engine cylinder when in the first of two positions, c. means biasing the piston to a second position in which said vent is open, and d. means forming a restricted passage to connect the interior of said chamber on the side of the piston opposite the engine cylinder to the interior of the engine cylinder on which said chamber means is mounted whereby firing pressure in the engine cylinder will develop pressure in said chamber and move said piston to said first position.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |