Throttling passageway to decrease coast-down time of lawn mower

Details Throttling passageway to decrease coast-down time of lawn mower Throttling passageway to decrease coast-down time of lawn mower

1978-07-27

1980-03-25

Lazarus, Ira S.

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

123182, 56 105, F02B 7708

Patent

active

041944852

ABSTRACT:
Disclosed herein is a lawn mower including a rotatable cutter blade, a reciprocating internal combustion engine drivingly connected to the cutter blade and a venting arrangement for venting the engine cylinder combustion chamber at engine shut down to decrease the engine coast-down time. The venting arrangement includes a flow passage having an inlet port which opens into the combustion chamber and a discharge port which either opens directly to the atmosphere, is connected in communication with the engine crankcase, or is connected in communication with the engine exhaust system. Venting of the combustion chamber through the flow passage is selectively controlled by a valve which is operably connected to the ignition switch and is opened in response to movement of the ignition switch from an engine operating position to an engine shutoff position. The valve remains open during engine coast down and the minimum cross sectional flow area of the flow passage is sized relative to the volumetric displacement of the piston so as to produce pumping losses which minimize the time required for the engine to come to a complete stop.

REFERENCES:
patent: 2778349 (1957-01-01), Thommen
patent: 2943615 (1960-07-01), Kainz
patent: 3400702 (1968-09-01), Watkins
patent: 3849620 (1974-11-01), Melidz
patent: 3955653 (1976-05-01), Comer
patent: 4079721 (1978-03-01), Brown

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