Carburetor and oil pump assembly and method of making the same
AssigneeTextron Inc.
InventorsJames R. Gassen, Lakhbir S. Suchdev
Life of this patent
Estimating the term…
Abstract
A carburetor and chain oiling assembly and method of manufacturing the same for use in a chain saw. The assembly generally comprises a carburetor section, an oil pump section and a cover connecting the two sections. The cover can connect the oil pump section to the carburetor section forming a cover for a carburetor fuel diaphragm and a working chamber with an oil pump diaphragm. The cover has a gas conduit between the carburetor housing and the working chamber such that gas pulses from an engine crankcase can be supplied to the working chamber to operably move the oil pump diaphragm to provide a continuous and automatic metered flow of oil to a saw chain.
Claims18
A chain saw having an engine with a crankcase, a saw chain, and a carburetor and saw chain oiler assembly, said assembly comprising:
- first frame means having an oil inlet, an oil outlet, a first conduit means connecting said inlet and said outlet, and a first recess;
- piston means having a piston member at least partially positioned in said first conduit means and adapted for reciprocal movement therein;
- an oil pump diaphragm connected to said first frame means and said piston member proximate said first recess;
- carburetor means having a carburetor housing and a carburetor fuel diaphragm;
- and
- second frame means having a first side with a second recess, a second side with a third recess and a first gas conduit means between said second recess and said second side adapted for communication with a gas conduit in said carburetor housing extending from said crankcase, said second side being mounted to said carburetor housing with said third recess adapted to allow said fuel diaphragm of said carburetor relatively free movement, said first frame means being mounted to said second frame means with said first and second recesses forming a diaphragm movement area for said oil pump diaphragm with a working chamber formed by said second recess and said oil diaphragm such that gas pressure pulses from said crankcase can be supplied to said second recess to move said oil pump diaphragm for moving said piston member to pump oil from said inlet to said outlet for oiling said saw chain whereby the carburetor and chain oiler assembly has a relatively small size, relatively light weight and a relatively few number of parts.
A carburetor and automatic saw chain oiler assembly for use in a chain saw having an internal combustion engine, the combined carburetor and oiler assembly comprising:
- carburetor means having a housing means and a fuel diaphragm;
- oil pump means having a pump frame means, a piston means, and an oil diaphragm connecting one end of said piston means with said pump frame means;
- and
- cover frame means connecting said carburetor means with said oil pump means, said cover frame means comprising a frame member being adapted to form a cover for said carburetor fuel diaphragm and further being adapted to form a working chamber with said oil diaphragm whereby the combined carburetor and oiler assembly is relatively compact with a relatively few number of parts.
A method of manufacturing a combined carburetor and oiler assembly for use with an internal combustion engine comprising the steps of:
- providing a pump housing member having a piston bore and a first diaphragm recess;
- mounting an oil piston assembly with the pump housing member, the piston assembly having a piston member adapted for movement in the piston bore and a piston driving diaphragm;
- connecting the pump housing member and oil piston assembly to a cover member, the cover member having a second recess on a first side adjacent the oil piston assembly and a third recess on a second side;
- and
- connecting the cover member to a carburetor housing member, the cover member substantially separating and being sandwiched between the pump housing member and the carburetor housing member, the second recess and piston driving diaphragm forming a working chamber for moving the piston member, and the third recess forming a relief chamber for a carburetor fuel diaphragm whereby the pump housing member, cover member and carburetor housing member are integrally connected to form a combined carburetor and oiler assembly.
Dependencies are inferred from the claim text.