Claims
- 1. A fuel adjustment device for a carburetor comprising
- a carburetor body;
- manual adjustment valves that regulate separately the effective cross-sectional area of a main fuel jet and a low-speed fuel jet in said carburetor body, said adjustment valves are located parallel and adjacent to each other and have threaded base-end portions and threaded small-diameter portions, said adjustment valves having non-uniform external thread diameters over a portion of their length; and
- a retaining plate adapted to be laid against an outer surface of said carburetor body, said retaining plate defining retainer holes adapted to receive and retain said manual adjustment valves in a prescribed adjustment position, said retainer holes having a diameter equal to or smaller than the external thread diameters of the base-end portions of said adjustment valves, whereby the threaded base-end portions of said adjustment valves fixedly engage said retaining plate at said retainer holes.
- 2. The fuel adjustment device of claim 1, wherein the threads of the threaded base-end portions of said adjustment valves cut into said retaining plate when said adjustment valves are inserted into said carburetor body.
- 3. The fuel adjustment device of claim 1, wherein the base-end portions and small diameter portions of said adjustment valves each have male threads having a pitch, a thread-bottom diameter, an effective diameter and an external diameter, the male threads of the small diameter portion having a pitch, a thread-bottom diameter and an effective diameter equal to the pitch, thread-bottom diameter and effective diameter of the base-end portion.
- 4. The fuel adjustment device of claim 3, wherein the external diameters of the male threads of the base-end portions are larger than the external diameters of the male threads of the small diameter portions.
- 5. A fuel adjustment device for a carburetor, comprising an adjustment valve adjustably inserted into the carburetor, said adjustment valve having a non-uniform external thread diameter over a portion of its length, said adjustment valve having a base-end portion and a small diameter portion, and
- a retaining plate laid against an outer surface of the carburetor, and having a retainer hole adapted to receive and retain said adjustment valve in a prescribed adjustment position, said retainer hole having a diameter equal to or smaller than the external thread diameter of the base-end portion of the adjustment valve.
- 6. The fuel adjustment device of claim 5, wherein the base-end portion and small diameter portion of said adjustment valve each have male threads having a pitch, a thread-bottom diameter, an effective diameter and an external diameter, the male threads of the small diameter portion having a pitch, a thread-bottom diameter and an effective diameter equal to the pitch, thread-bottom diameter and effective diameter of the base-end portion.
- 7. The fuel adjustment device of claim 6, wherein the external diameter of the male threads of the base-end portion is larger than the external diameter of the male threads of the small diameter portion.
- 8. The fuel adjustment device of claim 7, wherein said retaining plate is made of an elastic material.
- 9. The fuel adjustment device of claim 7, wherein the carburetor has a screw hole adapted to receive said adjustment valve, the screw hole having female threads having a pitch, thread-bottom diameter, effective diameter and internal diameter equal to the pitch, thread-bottom diameter, effective diameter and external diameter of the male threads of the base-end portion of said adjustment valve.
- 10. The fuel adjustment device of claim 9, further comprising a member placed between said retaining plate and the outer surface of the carburetor.
- 11. The fuel adjustment device of claim 10, wherein said retaining plate is provided with a plurality of annular projecting strips adapted to engage said member.
- 12. The fuel adjustment device of claim 7, further comprising
- a second adjustment valve adjustably inserted into the carburetor, said second adjustment valve being identical to said first adjustment valve,
- wherein said retaining plate has a second retainer hole adapted to receive and retain said second adjustment valve in a prescribed adjustment position.
Priority Claims (2)
Number |
Date |
Country |
Kind |
6-244828 |
Sep 1994 |
JPX |
|
6-323568 |
Dec 1994 |
JPX |
|
Parent Case Info
This is a divisional of co-pending application Ser. No. 08/915,358 filed Aug. 20, 1997, which is a continuation of application Ser. No. 08/624,757, filed Mar. 27, 1996, which issued as U.S. Pat. No. 5,772,927, which is a continuation of application Ser. No. 08/526,039, filed Sep. 8, 1995, now abandoned, which is a continuation-in-part of application Ser. No. 08/406,567, filed Mar. 20, 1995, which issued as U.S. Pat. No. 5,695,693, and which are incorporated herein by reference.
US Referenced Citations (17)
Foreign Referenced Citations (7)
Number |
Date |
Country |
2352955 |
Dec 1977 |
FRX |
2401803 |
Sep 1974 |
DEX |
2548226 |
May 1976 |
DEX |
47-42424 |
Oct 1972 |
JPX |
00-14234 |
Feb 1978 |
JPX |
61-134555 |
Aug 1986 |
JPX |
1-28220 |
Jun 1989 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
915358 |
Aug 1997 |
|
Continuations (2)
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Number |
Date |
Country |
Parent |
624757 |
Mar 1996 |
|
Parent |
526039 |
Sep 1995 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
406567 |
Mar 1995 |
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