US 5,630,965 A · Low force limit device

Abstract

A carburetor fuel adjusting limit device that facilitates control of the quantity of fuel that flows from the fuel chamber to an air intake port of a carburetor by making it possible for the user to adjust a fuel adjustment valve within the limits defined by emission control regulations. The limit device has a cap that comprises an engagement area to engage a valve extension of the fuel adjustment valve and radially extending appendages to limit rotation. The construction of the engagement area, which includes axial and radial locks, enables the cap to be pressed onto the valve extension with a relatively low amount of force. The fuel adjustment valve includes a screw head attached to the valve extension and constructed to break away from the valve extension at a torque that exceeds about 8 kg-cm. A retainer is utilized to retain the cap in a disengaged position adjacent the valve extensions. Once the cap is pressed onto the valve extension the cap and the fuel adjustment valve rotate as a unit.

Claims31

Dependent claims

A limit device for a carburetor comprising

a body,
a fuel adjustment valve inserted in said body, said adjustment valve including a valve extension extending from said body, said valve extension having a screw head formed on the end thereof, a knurled portion nearly adjacent said screw head, and a lock groove interposed between said screw head and said knurled portion, and
a generally cylindrical cap mounted on said adjustment valve, said cap including an axial latch adapted to foldably pass over said screw head and close into said lock groove of said valve extension, and a radial lock adapted to engage said knurled portion of said valve extension.

Dependencies are inferred from the claim text.

Low force limit device

Life of this patent

Low force limit device

Life of this patent

Abstract

Claims31