US3882833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engines
Assignee: Meakers Realisations Ltd
•
Filing: 1973-07-12
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Granted: 1975-05-13
•
Expires: 1993-07-12
Abstract
Abstract An internal combustion engine has inlet and/or exhaust valves which are held in open or closed positions by magnetic field generated by a solenoid. Resilient means are provided to bias the valve against the action of the magnetic field. The magnetic field is generated periodically, as a function of engine speed, by activation of a scanning means activated by light or other radiation periodically being allowed to pass to the scanning means by way of an aperture in a mask.
Inventors
- 👤 Kenneth Longstaff
- 👤 Stanley Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:38
CPC Classifications
F; F01; F01L; F01L9/00; F01L9/20; F01L2810/00; F01L2810/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
210 words
An internal combustion engine having: a. a block including at least one cylinder; b. the block defining a duct providing access to the cylinder; c. a tappet valve having a stem and a valve head, the stem being disposed in, and slidable relative to, the block for movement between a closed position in which the valve head isolates the duct from the cylinder and an open position in which the valve head allows the passage of fluid between the duct and cylinder; d. magnetic means linked to the valve stem; e. a magnetic field generator mounted on the block and adapted to generate a magnetic field to retain the valve, by way of the magnetic means, in the open or the closed position; and f. resilient means disposed on the block, and adapted to act between valve and block to bias the valve against the action of the magnetic field of the generator, said resilient means comprising first and second belleville spring washers so disposed between valve and block that, in the open position, the first belleville spring washer is fully compressed while the second belleville spring washer is uncompressed and, in the closed position, the second belleville spring washer is fully compressed while the first belleville washer is uncompressed.
Claim 2
Dependent Claim
210 words
An internal combustion engine having: a. a block including at least one cylinder; b. the block defining a duct providing access to the cylinder; c. a tappet valve having a stem and a valve head, the stem being disposed in, and slidable relative to, the block for movement between a closed position in which the valve head isolates the duct from the cylinder and an open position in which the valve head allows the passage of fluid between the duct and cylinder; d. magnetic means linked to the valve stem; e. a magnetic field generator mounted on the block and adapted to generate a magnetic field to retain the valve, by way of the magnetic means, in the open or the closed position; and f. resilient means disposed on the block, and adapted to act between valve and block to bias the valve against the action of the magnetic field of the generator, said resilient means comprising first and second belleville spring washers so disposed between valve and block that, in the open position, the first belleville spring washer is fully compressed while the second belleville spring washer is uncompressed and, in the closed position, the second belleville spring washer is fully compressed while the first belleville washer is uncompressed.
Claim 3
Dependent Claim
61 words
An internal combustion engine as claimed in claim 1 wherein the generator incorporates means whereby it is periodically energised by way of a scanninG means activated by the passage of a beam of light or other radiation to the scanning means from a source of the radiation through a mask member defining an aperture periodically interposed between scanning means and source.
Claim 4
Dependent Claim
43 words
An internal combustion engine as claimed in claim 2 wherein the mask member is displaceable from a datum position, by an amount dependent on the engine speed, to vary that part of the aperture through which the radiation passes to the scanning means.
Claim 5
Dependent Claim
46 words
An internal combustion engine as claimed in claim 3 wherein the mask member is a cylinder rotating about its longitudinal axis, the aperture being provided in the cylinder wall, the datum position lying on the axis and the cylinder being displaceable axially therefrom by the amount.
Claim 6
Dependent Claim
53 words
An internal combustion engine as claimed in claim 1 comprising a spark ignition device connected to a second scanning means and a second aperture in the mask member to allow the periodic passage of light or other radiation from a source to the second scanning means to initiate spark ignition by the device.
References Cited (Backward Citations)
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US1618045A
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US2468917A
Cited
US3548793A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |