Patent US4071000A successfully refreshed from Google Patents.
US4071000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double crankshaft valved two cycle engine
Assignee: Individual
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Filing: 1976-12-10
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Granted: 1978-01-31
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Expires: 1996-12-10
Abstract
Abstract A two cycle engine is disclosed wherein a pair of pistons reciprocate within a common cylinder to operate a pair of crankshafts mounted at opposite ends of said cylinder. Intake mixtures for the cylinder are crankcase-pumped, and both the intake and output ports of each crankcase are valved. This valving prevents combustion within the crankcase and limits the compression volume in order to assure the highest compression of intake gases possible. A piston ring is included at the lower end of the skirt of each piston in order to further reduce the compressed volume.
Inventors
- 👤 Chester L. Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:56
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/104; F02M35/116; F02M35/1165; F01; F01B; F01B7/00; F01B7/02; F01B7/14; F01L; F01L3/00; F01L3/20; F01L3/205; F02B; F02B25/00; F02B25/02; F02B25/08; F02B75/00; F02B75/28; F02B75/282; F02M35/1015; F02M35/1019; F02M35/10242; F02M35/10275; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
284 words
A two cycle internal combustion engine having a power stroke on each rotation of the crankshaft, comprising: a cylinder open at both ends and including a plurality of intake ports passing through the cylindrical wall of said cylinder at one end and a plurality of exhaust ports passing through the cylindrical wall of said cylinder at the other end; a pair of crankcases connected at opposite ends of said cylinder, each of said crankcases including inlet and output ports; a pair of crankshafts mounted in said pair of crankcases; a pair of pistons each having a skirt and each connected to one of said crankshafts for reciprocation in opposite ends of said cylinder, the skirt of one of said pistons periodically covering and uncovering said cylinder intake ports and thereby opening and closing said intake ports to said cylinder during said reciprocation and the other of said pistons periodically covering and uncovering said cylinder exhaust ports and thereby opening and closing said exhaust ports to said cylinder during said reciprocation; means for connecting both of said crankshafts to a single output shaft to produce output power; means for conducting a mixture of fuel and air to said inlet ports of each of said crankcases; a manifold connected exclusively to said outlet ports of both of said crankcases and to said plural intake ports of said cylinder; a high speed valve mounted on each of said crankcases to periodically open and close said inlet ports of each of said crankcases; and high speed valve means for preventing detonation of fuel contained in said crankcases, said means mounted on each of said crankcases to periodically open and close said outlet ports of each of said crankcases.
Claim 2
Dependent Claim
284 words
A two cycle internal combustion engine having a power stroke on each rotation of the crankshaft, comprising: a cylinder open at both ends and including a plurality of intake ports passing through the cylindrical wall of said cylinder at one end and a plurality of exhaust ports passing through the cylindrical wall of said cylinder at the other end; a pair of crankcases connected at opposite ends of said cylinder, each of said crankcases including inlet and output ports; a pair of crankshafts mounted in said pair of crankcases; a pair of pistons each having a skirt and each connected to one of said crankshafts for reciprocation in opposite ends of said cylinder, the skirt of one of said pistons periodically covering and uncovering said cylinder intake ports and thereby opening and closing said intake ports to said cylinder during said reciprocation and the other of said pistons periodically covering and uncovering said cylinder exhaust ports and thereby opening and closing said exhaust ports to said cylinder during said reciprocation; means for connecting both of said crankshafts to a single output shaft to produce output power; means for conducting a mixture of fuel and air to said inlet ports of each of said crankcases; a manifold connected exclusively to said outlet ports of both of said crankcases and to said plural intake ports of said cylinder; a high speed valve mounted on each of said crankcases to periodically open and close said inlet ports of each of said crankcases; and high speed valve means for preventing detonation of fuel contained in said crankcases, said means mounted on each of said crankcases to periodically open and close said outlet ports of each of said crankcases.
Claim 3
Dependent Claim
79 words
A two cycle internal combustion engine as defined in claim 1 wherein said high speed valve mounted on each of said crankcases for opening and closing said inlet ports and said high speed valve means mounted on each of said crankcases opening and closing said outlet ports are rotary valves mounted on said pair of crankshafts and positioned adjacent the wall of said crankcases, said rotary valves on said outlet ports periodically isolating said crankcases from said intake manifold.
Claim 4
Dependent Claim
66 words
A two cycle internal combustion engine as defined in claim 1 wherein said high speed valves mounted on each of said crankcases to periodically open and close said inlet ports and said high speed valve means mounted on each of said crankcases to periodically open and close said outlet ports are one-way valves responsive to pressure differentials across said valves to open and close said valves.
Claim 5
Dependent Claim
58 words
A two cycle internal combustion engine as defined in claim 1 wherein said plurality of intake ports are spaced around the circumference of said cylinder at one end of said cylinder and wherein said manifold includes an annular manifold section surrounding said one end of said cylinder for conducting fuel-air mixture to each of said plural intake ports.
Claim 6
Dependent Claim
167 words
A two cycle internal combustion engine having a power stroke on each rotation of the crankshaft, comprising: a cylinder open at both ends, said cylinder including an intake port passing through the cylindrical wall of said cylinder at one end of said cylinder and an exhaust port passing through the cylindrical wall of said cylinder at the other end of said cylinder; a pair of pistons reciprocating in opposite ends of said cylinder, said pistons operating to periodically block and unblock said intake and exhaust ports during said reciprocation; a pair of compression enclosures mounted and sealed to opposite ends of said cylinder; an intake conduit connected exclusively between each of said compression enclosures and said intake port; and a pair of high speed valve means for preventing the detonation of fuel contained in said compression enclosures, said means mounted at the junction of each of said compression enclosures and said intake conduit for periodically opening and closing each of said compression enclosures to said intake conduit.
Claim 7
Dependent Claim
167 words
A two cycle internal combustion engine having a power stroke on each rotation of the crankshaft, comprising: a cylinder open at both ends, said cylinder including an intake port passing through the cylindrical wall of said cylinder at one end of said cylinder and an exhaust port passing through the cylindrical wall of said cylinder at the other end of said cylinder; a pair of pistons reciprocating in opposite ends of said cylinder, said pistons operating to periodically block and unblock said intake and exhaust ports during said reciprocation; a pair of compression enclosures mounted and sealed to opposite ends of said cylinder; an intake conduit connected exclusively between each of said compression enclosures and said intake port; and a pair of high speed valve means for preventing the detonation of fuel contained in said compression enclosures, said means mounted at the junction of each of said compression enclosures and said intake conduit for periodically opening and closing each of said compression enclosures to said intake conduit.
Claim 8
Dependent Claim
45 words
A two cycle internal combustion engine as defined in claim 5 wherein said pair of high speed valve means comprise rotary valves operating in synchronism with the motion of said pair of pistons, said rotary valves periodically isolating said compression enclosures from said intake conduit.
Claim 9
Dependent Claim
36 words
A two cycle internal combustion engine as defined in claim 5 wherein each of said pair of high speed valve means comprises a one-way valve responsive to pressure differentials across said valve for opening and closing.
Claim 10
Dependent Claim
51 words
A two cycle internal combustion engine as defined in claim 5 additionally comprising: a pair of carburetors connected to each of said compression enclosures; and a pair of high speed valves positioned between said carburetors and said compression enclosures for periodically admitting fuel-air mixture from said carburetors to said compression enclosures.
Claim 11
Dependent Claim
55 words
A two cycle internal combustion engine as defined in claim 5 wherein said intake port comprises plural intake ports positioned around the circumference of said cylinder wall at said one end of said cylinder wall and wherein said intake conduit includes an annular manifold surrounding said cylinder for communication with each of said intake ports.
References Cited (Backward Citations)
US877834A
Cited
US1199204A
Cited
US1424798A
Cited
US1578476A
Cited
US2246701A
Cited
US2782777A
Cited
US2844131A
Cited
US2917032A
Cited
US3119380A
Cited
US3672172A
Cited
US3805750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |