Internal-combustion engines – Atmospheric
Patent
1994-08-29
1995-11-14
Nelli, Raymond A.
Internal-combustion engines
Atmospheric
F02M 712
Patent
active
054656982
ABSTRACT:
The invention is directed to a membrane carburetor for changing the air/fuel ratio. The membrane carburetor achieves the same result as previous carburetors but at a greater insensitivity to wear and disturbances as well as an improved controllability in a constructively simpler and more compact manner. The carburetor includes a coil arranged about a valve needle so that the coil and the valve needle conjointly define a solenoid actuator. The valve needle is the armature of the solenoid actuator. When a limit rpm is reached, the coil is activated by a current and the armature is raised and thereby a greater flow of fuel is made possible. The enrichment of the air/fuel mixture achieved in this manner limits the engine rpm. The membrane carburetor wherein the air/fuel ratio can be changed is for an internal combustion engine of a portable handheld apparatus such as a motor-driven chain saw, hedge clippers and the like.
REFERENCES:
patent: 4726342 (1988-02-01), Diener
patent: 4787356 (1988-11-01), Rosgen et al.
patent: 4944272 (1990-07-01), Carlsson et al.
patent: 4949692 (1990-08-01), Devine
patent: 5345912 (1994-09-01), Svensson et al.
Andreas Stihl
Nelli Raymond A.
Ottesen Walter
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