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AssigneeWalbro Corporation
InventorsDavid D. Hacker, Eric L. King, George M. Pattullo
Estimating the term…
Improvement in peanut clip limiter cap holder, wherein the clip spring legs are interconnected by a spring web that flexes to accommodate flexing of the clip legs free ends during insertion of the associated limiter caps into the retaining clip, and prolongs the effective friction grip service life of the clip. Optional detent dimples on the clip spring legs and cooperative limiter cap grooves enhance yieldable retention of the caps in the clip and the clip on the needle valves. When the peanut clip is used to install only a single limiter cap on a single needle valve, a dummy stud is mounted to the carburetor in the vacant needle valve position and the stud head occupies the vacant limiter cap position in the clip. An improved needle valve is made as an assembly of a lathe-turned tip/shank part and a separate precision die cast head part. The head part has the needle spring stop flange, the fluted spline portion, the limiter cap barb retention structure, and a cavity telescopically receiving a shank stem to rotationally drive couple the shank and head parts in assembly. The shank stem is press fit or cast into the head cavity to permanently join the shank and head parts in fixed relationship, or preferably the head cavity cooperates with the shank stem and a cross arm thereof to form a releasable, telescopic, quarter-turn bayonet coupling. The needle valve spring biases the bayonet coupling to fully locked condition. Coupling axial lost motion insures lock-on of cap retention barbs on the head of the "shorter" needle, and thus final installation lock-on of both limiter caps while being held by the clip. "Side-play" between head and shank parts isolates the needle shank part from adverse needle bending moments.
A limiter cap holder clip of generally peanut shape in cross-section transverse to the axis of a limiter cap held by said holder clip, said holder clip having a pair of first and second end lobes constructed and arranged to respectively encircle most of the circumference of the respective cylindrical bodies of a pair of first and second limiter caps, said holder clip further having laterally spaced first and second nip portions connected to said end lobes and generally spanning the space therebetween and adapted for holding two limiter caps in a paired side-by-side subassembly with said holder clip for telescopic installation and rotational orientation on respective valve shank heads of a pair of carburetor-mounted needle valves, said second nip portion being split to form a parting gap therein to separate said second nip portion into first and second resiliently flexible spring legs respectively cantilevered from said first and second lobes, said legs each having a free end and being oriented such that said first leg free end faces said second leg free end and said parting gap is defined between said mutually facing leg free ends, and wherein said legs are interconnected by a living hinge in the form of an arcuate resiliently flexible web having its concave side facing said gap and being integrally joined at its longitudinally opposite ends to said legs so as to span said parting gap on the side of said legs remote from said first nip portion.
A limiter cap holder clip for use with a carburetor having first and second jets and first and second side-by-side adjusting valve screws respectively operable in the carburetor for fuel flow control of the first and second jets, each screw having an adjusting head extending from the carburetor in exposed condition for jet adjustment, and for further use with first and second open-ended limiter caps each having a rotational limiting means and being respectively individually telescopically receivable open-end first on the screw adjusting heads in laterally closely spaced side-by-side paired relation, said holder clip being made of semi-resilient material resistant to damage by ozone and petroleum products and having first and second opposed end lobe portions respectively constructed and arranged for partially encircling and engaging the first and second caps, said holder clip further having first and second bight nip portions connected to said lobe portions and generally spanning the space between said end lobe portions, said holder clip lobe portions having cap interengaging means constructed and arranged such that said holder clip lobe portions are adapted to hold the caps in laterally spaced parallel axis relationship, to orient the caps for telescopic open-end first assembly onto the screw heads and to yieldably resist rotation of the caps about their axes relative to said holder clip;
A limiter-cap-receiving needle valve assembly for adjusting fuel flow in a carburetor having a generally cylindrical rotatable elongate shank part with a flow controlling valve control surface at one end, an externally threaded portion on said shank part adjacent said one end thereof for threadably adjusting the axial position of the valve control surface when operably installed in the carburetor, a rotationally manipulatable head part operably coupled at one axial end thereof to a second end axially opposite said one end of said shank part for rotatably driving said shank and having a given maximum diameter, a limiter cap stop flange on said head part protruding radially outwardly of said head and shank parts and located axially on one axial end of said head part closest to said shank threaded portion, a radially enlarged externally fluted spline portion protruding radially outwardly from said head part and located axially between said flange and an axially opposite end of said head part, and a head first groove portion located axially between said head spline portion and a first head-shoulder portion located on said head adjacent said head opposite end, said head first groove portion having a first surface of revolution of reduced diameter relative to said head opposite end maximum diameter and disposed adjacent thereto to define a first head-shoulder junction therewith, said head groove portion also having a conically tapering portion extending axially from said reduced diameter first surface of revolution toward said spline portion and increasing in diameter from minor to major diameter portions thereof in the direction toward said spline portion, and wherein said head and shank are separately made one-piece parts.
A limiter-cap-receiving needle valve assembly for adjusting fuel flow in a carburetor having a generally cylindrical rotatable elongate shank part with a flow controlling valve control surface at one end, an externally threaded portion on said shank part adjacent said one end thereof for threadably adjusting the axial position of the valve control surface when operably installed in the carburetor, a rotationally manipulated head part operably coupled at one axial end thereof to a shank part second end axially opposite said one end of said shank part for rotatably driving said shank part, a limiter cap stop flange on said head part protruding radially outwardly of said head and shank parts and located axially on one axial end of said head part closest to said shank part threaded portion, a radially enlarged externally fluted spline portion protruding radially outwardly from said head part and located axially between said flange and an axially opposite end of said head part, said head part having groove means and shoulder means located adjacent said groove means for yieldably retaining a limiter cap axially on said head part for free rotation thereon and axially spaced from said spline portion, and wherein said head and shank parts are separately made one-piece parts.
Dependencies are inferred from the claim text.