Tamper resistant carburetor needle valve adjustment limiter

Details Tamper resistant carburetor needle valve adjustment limiter Tamper resistant carburetor needle valve adjustment limiter

1996-07-18

1998-01-13

Miles, Tim R.

Gas and liquid contact apparatus

Fluid distribution

Valved

261DIG38, 261DIG84, 137382, F02M 308

Patent

active

057075611

ABSTRACT:
A limiter of the extent of adjustment of a fuel metering needle valve of a carburetor for an internal combustion engine. The limiter has a housing with a passage in which the head end of the needle valve is received and a cap received in the passage on the head end of the valve for rotation in unison with the valve. An arm carried by the body of the cap is engagable with a stop in the passage to limit to less than one complete revolution the extent to which the cap and needle valve can be rotated by an end user to adjust the needle valve. To provide a tamper-resistant limiter, the head of the cap is received in a bore of the housing passage with either only a slight clearance between them or an interference fit which also inhibits rotation of the valve by vibration of the operating engine on which the carburetor and limiter are utilized. Preferably, a non-circular recess in the head of the cap is constructed to receive the blade of a tool, such as a screw driver, to facilitate manually rotating the cap and the needle valve in unison within the limits provided by the arm and stop to permit only limited adjustment of the needle valve by an end user.

REFERENCES:
patent: 3618906 (1971-11-01), Charron
patent: 4246929 (1981-01-01), Wakeman
patent: 4308220 (1981-12-01), Tateno
patent: 5055238 (1991-10-01), Araki
patent: 5236634 (1993-08-01), Hammett et al.
patent: 5252261 (1993-10-01), Gerhardy
patent: 5322645 (1994-06-01), Hammett et al.
patent: 5603869 (1997-02-01), McNew et al.

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