Back to results
US 4,416,108 AGranted
Device for reducing evaporation loss from carburetors and fuel tanks
AssigneeOutboard Marine Corporation
InventorBurzoe K. Ghandhi
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeOutboard Marine Corporation
InventorBurzoe K. Ghandhi
Estimating the term…
A lawn mower is illustrated as including a carburetor having a float bowl adapted to contain a vent assembly for selectively venting the air space of the carburetor float bowl to the atmosphere when the internal combustion engine of the lawn mower is running and for precluding evaporation of fuel from the air space when the engine is not running. The lawn mower fuel tank also includes a vent assembly for selectively venting the fuel tank to the atmosphere when the internal combustion engine is running and for precluding evaporation of fuel from the fuel tank into the atmosphere when the engine is not running. Each vent assembly includes a valve member resting on a valve seat and supported for movement in response to vibration of the engine and in such a manner that the valve member will return to its position on the valve seat when the engine is shut off.
A lawn mower including a blade housing, a wheel for supporting the blade housing for movement along the ground, a rotatable cutting blade supported in the blade housing, and an internal combustion engine for rotatably driving said cutting blade, the internal combustion engine including a carburetor having a float bowl adapted to contain a quantity of liquid fuel and adapted to have a contained air space above the liquid fuel, and means for selectively venting said float bowl to the atmosphere, said means for selectively venting including means for venting the air space to the atmosphere in response to engine vibration when said internal combustion engine is running and for precluding evaporation of fuel from the float bowl into the atmosphere when said engine is not running.
A lawn mower including a blade housing, a wheel for supporting the blade housing for movement along the ground, a rotatable cutting blade supported in the blade housing, and an internal combustion engine for rotatably driving said cutting blade, the internal combustion engine including a carburetor having a float bowl adapted to contain a quantity of liquid fuel and adapted to have an air space above the liquid fuel, means for selectively venting said air space to the atmosphere in response to engine vibration when said internal combustion engine is running and for precluding evaporation of fuel from said air space into the atmosphere when said engine is not running, a fuel tank adapted to contain liquid fuel and adapted to have an air space above the liquid fuel, means for selectively venting the fuel tank to the atmosphere when said internal combustion is running and for precluding evaporation of fuel from the fuel tank into the atmosphere when said engine is not running, and a conduit between said fuel tank and said float bowl for conveying liquid fuel from the fuel tank to the float bowl.
A lawn mower including a blade housing, a wheel for supporting the blade housing for movement along the ground, a rotatable cutting blade supported in the blade housing, an internal combustion engine for rotatably driving the cutting blade, and a fuel tank adapted to contain a quantity of liquid fuel and adapted to have a confined air space above the liquid fuel, and said fuel tank including means for selectively venting said fuel tank to the atmosphere, said means for selectively venting including means for venting the air space to the atmosphere in response to engine vibration when said internal combustion engine is running and for precluding evaporation of fuel from the fuel tank into the atmosphere when said engine is not running.
Dependencies are inferred from the claim text.