Patent US3575389A successfully refreshed from Google Patents.
US3575389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for automatic operation of a choke valve in a carburetor
Assignee: Honda Motor Co Ltd
•
Filing: 1969-03-05
•
Granted: 1971-04-20
•
Expires: 1989-03-05
Abstract
Abstract A choke valve in a carburetor is controlled by a temperature sensitive element which is directly coupled with a cam in turn coupled to the choke valve so that the valve will be moved in opposite directions in accordance with temperature variation of the engine irrespective of the contact of an operating member of a throttle valve with the cam.
Inventors
- 👤 Isamu Goto
- 👤 Minoru Inada
- 👤 Minoru Atsumi
- 👤 Toyoshige Miyazaki
- 👤 Mitsuaki Ninomiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:23
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/08; F02M1/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
181 words
Apparatus for the automatic operation of a rotatable choke valve in a carburetor, said apparatus comprising a throttle valve, a rotatable cam having a smooth, continuous cam surface for adjusting the degree of opening of the throttle valve, a choke valve coupled to said cam for rotation therewith about a common axis, a member coupled to said throttle valve for movement therewith about a common axis, said member resting in peripheral contact with said cam surface to follow rotation of said choke valve and cause the degree of opening of the throttle valve at idle to increase as the degree of opening of the choke valve is decreased, strong valve closing spring means for closing the choke valve and a temperature sensing device of strong expansion force coupled to said choke valve and including temperature expansion means for expanding upon receiving heat from an internal combustion engine to cause the degree of opening of the choke valve to the automatically adjusted according to the engine temperature regardless of whether the cam surface and said member are in contact one with another.
Claim 2
Dependent Claim
181 words
Apparatus for the automatic operation of a rotatable choke valve in a carburetor, said apparatus comprising a throttle valve, a rotatable cam having a smooth, continuous cam surface for adjusting the degree of opening of the throttle valve, a choke valve coupled to said cam for rotation therewith about a common axis, a member coupled to said throttle valve for movement therewith about a common axis, said member resting in peripheral contact with said cam surface to follow rotation of said choke valve and cause the degree of opening of the throttle valve at idle to increase as the degree of opening of the choke valve is decreased, strong valve closing spring means for closing the choke valve and a temperature sensing device of strong expansion force coupled to said choke valve and including temperature expansion means for expanding upon receiving heat from an internal combustion engine to cause the degree of opening of the choke valve to the automatically adjusted according to the engine temperature regardless of whether the cam surface and said member are in contact one with another.
Claim 3
Dependent Claim
64 words
Apparatus as claimed in claim 1 wherein said member is in frictional contact with said cam surface when the engine temperature is below a predetermined operating temperature, said temperature expansion means applying a force to said cam to turn the same against the frictional force of the contact of the cam with said member to open the choke valve as the engine temperature increases.
Claim 4
Dependent Claim
18 words
Apparatus as claimed in claim 2 wherein said temperature expansion means acts in opposition to said spring means.
Claim 5
Dependent Claim
37 words
Apparatus as claimed in claim 2 wherein said temperature expansion means comprises a temperature sensitive element and a displaceable rod coupled to said element and said cam for rotating the latter as the element senses increased temperature.
Claim 6
Dependent Claim
57 words
Apparatus as claimed in claim 4 wherein said temperature sensitive element comprises an enclosed chamber containing a substance which expands with increasing temperature, and means for passing a substance whose temperature is a measure of engine temperature into contact with said enclosure, said rod extending into said enclosure and being displaced by expansion of the substance therein.
Claim 7
Dependent Claim
49 words
Apparatus as claimed in claim 5 wherein said strong valve closing means acts on said rod to urge the same into the enclOsed chamber, said valve closing means having a sufficient strength to displace the rod against the frictional force of contact of said member with the cam surface.
Claim 8
Dependent Claim
27 words
Apparatus as claimed in claim 6 comprising a lever between said rod and cam for multiplying the effect on said cam of the displacement of said rod.
Claim 9
Dependent Claim
45 words
Apparatus as claimed in claim 6 wherein said means for passing the substance whose temperature is a measure of the engine temperature into contact with the enclosure comprises a housing surrounding said enclosure and an inlet and an outlet in said housing for said substance.
Claim 10
Dependent Claim
21 words
Apparatus as claimed in claim 8 wherein said enclosure is hermetically sealed and said substance in the enclosure is a fluid.
Claim 11
Dependent Claim
29 words
Apparatus as claimed in claim 9 wherein said rod is vertical and moves upward during expansion of the fluid substance and downwards under the action of the spring means.
Claim 12
Dependent Claim
38 words
Apparatus as claimed in claim 2 wherein said strong valve closing means comprises a spring having a strength to close the choke valve against the opposition of the friction force of contact of the cam with said member.
References Cited (Backward Citations)
US1921736A
Cited
US2400035A
Cited
US2478613A
Cited
US2815942A
Cited
US2681213A
Cited
US2774343A
Cited
US2868522A
Cited
US2998233A
Cited
US3291462A
Cited
US3151189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |