F - Mech Eng,Light,Heat,Weapons – 02 – B
Patent
F - Mech Eng,Light,Heat,Weapons
02
B
171/18, 56/48
F02B 61/00 (2006.01)
Patent
CA 1075162
ABSTRACT OF THE DISCLOSURE Disclosed herein is a lawn mower comprising a rotatable cutter blade supported on a frame, an internal combustion engine supported on the frame and including an engine block, a cylinder, and a reciprocative piston which is drivingly connected to the cutter blade, a valving arrangement for stopping the engine including an outlet port opening into the cylinder combustion chamber, a discharge port, a valve which is interposed the outlet and discharge ports and is movable between open and closed positions to respectively permit and block communication between the outlet and discharge ports, and a valve member which, in response to the combustion chamber during opens the vent gases from the combustion chamber pressure, the compression stroke of the piston and closes to prevent entry of gases through the discharge port into the com- bustion chamber during the expansion stroke of the piston, and a spring for biasing the valve toward the open position. Operation of the valve is controlled by a control mechanism which is movable between an operating position and a non- operating position corresponding to the open position of the valve and is biased to the non-operating position by the spring.
276769
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