US3921608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stroke internal combustion engine
Assignee: Individual
•
Filing: 1974-04-02
•
Granted: 1975-11-25
•
Expires: 1994-04-02
Abstract
Abstract A two-stroke engine having a cavity formed by the piston head and subdivided into a first chamber fed with air and a second chamber fed with a mixture of fuel and air.
Inventors
- 👤 Helmut Kottmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:42
CPC Classifications
F; F02; F02B; F02B33/00; F02B33/02; F02B33/06; F02B33/22; F02B17/00; F02B25/00; F02B25/20; F02B25/22; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
In a two-stroke lifting cylinder combustion engine having an engine block; a charging pump cylinder and a working cylinder provided in the said block; a crankshaft; and a cylindrical slide pump piston and a working piston located in said pump cylinder and working cylinder, respectively, and connected to the crankshaft so as to be driven thereby; said block defining an overflow channel therein interconnecting said cylinders, and said pump piston having an aperture therein for controlling the flow of fuel and air through said channel; the improvement comprising a separating wall extending in a direction substantially parallel to the longitudinal axis of the cylindrical slide pump piston and located in the pump piston for subdividing a cavity defined therein into first and second chambers, said block defining channels therein for interconnecting each of the chambers with the working cylinder, wherein air in the first chamber is fed into the working cylinder via one of the channels in said block and a fuel and air mixture in said second chamber is fed into the working cylinder via another of the channels in the block.
Claim 2
Dependent Claim
183 words
In a two-stroke lifting cylinder combustion engine having an engine block; a charging pump cylinder and a working cylinder provided in the said block; a crankshaft; and a cylindrical slide pump piston and a working piston located in said pump cylinder and working cylinder, respectively, and connected to the crankshaft so as to be driven thereby; said block defining an overflow channel therein interconnecting said cylinders, and said pump piston having an aperture therein for controlling the flow of fuel and air through said channel; the improvement comprising a separating wall extending in a direction substantially parallel to the longitudinal axis of the cylindrical slide pump piston and located in the pump piston for subdividing a cavity defined therein into first and second chambers, said block defining channels therein for interconnecting each of the chambers with the working cylinder, wherein air in the first chamber is fed into the working cylinder via one of the channels in said block and a fuel and air mixture in said second chamber is fed into the working cylinder via another of the channels in the block.
Claim 3
Dependent Claim
84 words
An engine as claimed in claim 1, wherein the said block defines two channels therein connecting the said first chamber to the said working cylinder and one channel connecting the said second chamber with said working cylinder, the point of connection of the second chamber channel with said working chamber being located above the points of connection of said first chamber channels with said working chamber relative to the direction of movement of said working piston from bottom dead centre to top dead centre.
Claim 4
Dependent Claim
52 words
An engine as claimed in claim 1, wherein said block defines therein one inlet channel to said charging pump cylinder common to both said chambers for the inflow of air to said chambers and a second inlet channel to said charging pump cylinder for the inflow of fuel into said second chamber.
Claim 5
Dependent Claim
54 words
An engine as claimed in claim 1, wherein the block defines therein a first inlet channel into said charging pump cylinder for the inflow of air into said first chamber and a second inlet channel into said charging pump cylinder for the inflow of a mixture of air and fuel into the second chamber.
Claim 6
Dependent Claim
21 words
An engine as claimed in claim 4, further comprising a pipe extending from said second inlet channel into the second chamber.
Claim 7
Dependent Claim
41 words
An engine as claimed in claim 5, further comprising a pipe extending from said first inlet channel into said charging pump cylinder so as to project into said first chamber when said pump piston is at a top dead centre position.
Claim 8
Dependent Claim
18 words
An engine as claimed in claim 6, further comprising a non-return valve connected with said second inlet channel.
Claim 9
Dependent Claim
18 words
An engine as claimed in claim 7, further comprising a non-return valve connected with said first inlet channel.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |