Internal-combustion engines – Igniters – Sparkers
Reexamination Certificate
2000-02-07
2001-06-05
Dolinar, Andrew M. (Department: 3747)
Internal-combustion engines
Igniters
Sparkers
C123S182100, C313S120000
Reexamination Certificate
active
06240888
ABSTRACT:
RELATED APPLICATIONS
There are no previously filed, nor currently any co-pending applications, anywhere in the world.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to decompression devices for internal combustion engines and, more particularly, to an aftermarket cylinder decompression device for motorcycle engines for activation during engine start up and the method for making same.
2. Descridption of the Related Art
Internal combustion engines and other high compression engines require a large cranking torque in order to start the engine. This can be especially difficult during cold starts. The large amount of cranking torque required places a great strain on starter motor and battery life often resulting in premature failure.
Various mechanism have been developed in order to provide compression relief during starting such as relief valves, decompression ports, and decompression slots formed in the walls of the cylinder. These devices vent a portion of the internal cylinder pressure during the compression stroke during startup in internal combustion engines thereby reducing the amount of torque needed to turn the crankshaft during start up.
In the related art, there exists patents for devices of this type for two-cycle engines. Typically, these devices are integrally built into the engine and there exists many attempts to engage the device upon startup by tying it to the starter recoil mechanism or via operator actuated means. However, no patents exist in the art for an aftermarket engine cylinder decompression device that can be used with many types of engines, particularly four-stroke motorcycle engines. Also, it is not always desirable to have the decompression device activated and devices of this type cannot be deactivated.
A search of the prior art did not disclose any patents that read directly on the claims of the instant invention; however, the following references were considered related:
U.S. Pat. No.
Inventor
Issue Date
5,799,635
Aljabari
Sep 1, 1998
3,687,124
Kolorz
Aug. 29, 1972
5,701,860
Horiuchi et al.
Dec. 30, 1997
5,582,143
Stark et al.
Dec. 10, 1996
5,379,734
Tsunoda et al.
Jan. 10, 1995
5,361,738
Iida
Nov. 8, 1994
5,116,287
Hironaka et al.
May 26, 1992
5,687,683
Knoblauch
Nov. 18, 1997
4,394,851
Greier et al.
Jul. 26, 1983
4,184,468
Freyn
Jan. 22, 1980
5,630,385
Taomo
May 20, 1997
5,377,642
Morrow et al.
Jan. 3, 1995
4,993,372
Mott et al.
Feb. 19, 1991
Consequently, a need has been felt for providing an aftermarket motorcycle engine decompression device for use during engine startup.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an improved motorcycle engine decompression valve to reduce the amount of torque required at engine startup.
It is another object of the present invention to provide an aftermarket motorcycle engine decompression valve that can used with virtually any motorcycle engine.
It is yet another object of the present invention to reduce the possibility of engine lock up during start up.
It is yet still another object of the present invention to preserve battery and starter motor life on electric start motorcycles.
It is still yet another object of the present invention to be operator activated only as required.
It is a benefit of the present invention that no disassembly of the motorcycle engine or machine shop work is required to install.
It is an advantage of the present invention it is easily installed at a relatively small cost.
Briefly described according to one embodiment of the present invention, provided is a decompression kit for large bore and/or high compression internal combustion engines. Specifically designed for engines such as the “Harley-Davidson®” “V-Twin®” or the “Sporster®”, the device vents high cylinder pressure and the associated high torque required to turn the crankshaft when starting the engine. The device also minimizes the possibility of dangerous kick back of the kick starter during manual starts. A modified spark plug, steel tubing, and decompression valves are the main components of the invention. Cylinder pressure during the compression stroke is vented through the spark plug, tubing, and the decompression valve to make starting the engine easy.
REFERENCES:
patent: 1492007 (1924-04-01), Wayte
patent: 2490646 (1949-12-01), Murphy et al.
patent: 4326145 (1982-04-01), Foster et al.
Corrigan Michael J.
Dolinar Andrew M.
Gugliotta John D.
LandOfFree
Internal combustion engine decompression valve kit and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Internal combustion engine decompression valve kit and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Internal combustion engine decompression valve kit and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2479633