Patent US3810450A successfully refreshed from Google Patents.
US3810450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stuffer for two-cycle engines
Assignee: Individual
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Filing: 1972-08-29
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Granted: 1974-05-14
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Expires: 1992-08-29
Abstract
Abstract In two-cycle internal combustion engines where the mixture of gas and air is introduced from the carburetor to the crankcase, and thereafter flows from the crankcase to the combustion cylinder, a stuffer is provided surrounding the inlet from the carburetor to the crankcase in a manner which does not interfere with flow into the crankcase, the stuffer extends into the crankcase and surrounds a part of the crankshaft and its counterweights in a manner so as to not interfere with the operation of the crankshaft while at the same time reducing the volumetric area of the crankcase. The stuffer is particularly useful in a two-cycle engine equipped with a back pressure producing muffler or exhaust constriction.
Inventors
- 👤 J Woodhouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:48
CPC Classifications
F; F02; F02B; F02B25/00; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B2700/00; F02B2700/03; F02B2700/034
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
189 words
In a two-cycle engine having a cylinder, a crankcase extending from one end of the cylinder, a carburetor mounted on the crankcase, a piston reciprocably mounted in the cylinder, a counterweighted crankshaft in the crankcase, a piston rod joining the piston and crankshaft, the counterweight portion and the piston rod attachment portion of the crankshaft being oppositedly offset from the center of rotation of the crankshaft and the crankcase having opposed recesses receiving said counterweight and attachment portions, the improvement of a stuffer in the crankcase filling the crankcase space between the carburetor and the crankshaft without interfering with the operation of the piston, piston rod and crankshaft, said stuffer having a flange between the crankcase and the carburetor, a body portion projecting from said flange filling both opposed crankcase recesses below the center line of the crankshaft and shaped to provide operating clearance for the counterweight and attachment portions of the crankshaft and having a port through the bottom of the body portion and the flange communicating with the carburetor and the crankcase and a reed valve controlling flow from the carburetor through the port to the crankcase.
Claim 2
Dependent Claim
189 words
In a two-cycle engine having a cylinder, a crankcase extending from one end of the cylinder, a carburetor mounted on the crankcase, a piston reciprocably mounted in the cylinder, a counterweighted crankshaft in the crankcase, a piston rod joining the piston and crankshaft, the counterweight portion and the piston rod attachment portion of the crankshaft being oppositedly offset from the center of rotation of the crankshaft and the crankcase having opposed recesses receiving said counterweight and attachment portions, the improvement of a stuffer in the crankcase filling the crankcase space between the carburetor and the crankshaft without interfering with the operation of the piston, piston rod and crankshaft, said stuffer having a flange between the crankcase and the carburetor, a body portion projecting from said flange filling both opposed crankcase recesses below the center line of the crankshaft and shaped to provide operating clearance for the counterweight and attachment portions of the crankshaft and having a port through the bottom of the body portion and the flange communicating with the carburetor and the crankcase and a reed valve controlling flow from the carburetor through the port to the crankcase.
Claim 3
Dependent Claim
132 words
A stuffer for a two-cycle engine which comprises a member having a flat flange adapted to be mounted between the carburetor and crankcase of a two-cycle engine, a body extending from one face of said flange having opposed side walls with external ribs adapted to fill recesses in the crankshaft for receiving the counterweight and piston rod attachment portions of the crankshaft of a two-cycle engine at a level below the center line of the crankshaft, said side walls having grooves affording clearance for the counterweight and piston rod attachment portions of the crankshaft, said stuffer having a central port through the flange and body portions thereof, a reed valve overlying the port, and a reed valve limiting member secured to the stuffer controlling the extent of opening of the reed valve.
Claim 4
Dependent Claim
132 words
A stuffer for a two-cycle engine which comprises a member having a flat flange adapted to be mounted between the carburetor and crankcase of a two-cycle engine, a body extending from one face of said flange having opposed side walls with external ribs adapted to fill recesses in the crankshaft for receiving the counterweight and piston rod attachment portions of the crankshaft of a two-cycle engine at a level below the center line of the crankshaft, said side walls having grooves affording clearance for the counterweight and piston rod attachment portions of the crankshaft, said stuffer having a central port through the flange and body portions thereof, a reed valve overlying the port, and a reed valve limiting member secured to the stuffer controlling the extent of opening of the reed valve.
Claim 5
Dependent Claim
35 words
The two-cycle engine assembly of claim 1 wherein the port of the stuffer has a clover-leaf shape, the reed valve has a conforming shape and a single screw attaches the reed valve to the stuffer.
Claim 6
Dependent Claim
37 words
The stuffer of claim 2 wherein the port has four lobes, the reed valve and the limiter are x-shaped overlying the port lobes and a central bolt unites the limiter and the reed valve to the stuffer.
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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |