Self-adjusting pushrod length checking tool
OwnerMichael Scanoinventor
Life of this patent
Estimating the term…
Abstract
A self-adjusting pushrod length checking tool for use in an internal combustion engine between the camshaft lifter and valve rocker arm, that determines the optimum pushrod length using a telescoping spring-loaded body upper rod and a lower rod assembly. The spring-loaded telescoping assembly self-adjusts and determines the optimum pushrod length when compressed and inserted between the camshaft and valve rocker arm, when the rocker arm pivot bolt is fully tightened down to the cylinder head. The telescoping assembly sections are then locked by a captive set screw, the assembly is removed from the engine, and accurate measurements of the assembly length are taken.
Claims8
A self-adjusting pushrod length checking tool, comprising:
- (a) a hollow upper rod, the hollow defining a cylindrical cavity open at one end and having a rim around the open end, the side of the upper rod having a threaded opening for receiving a set screw or captive set screw assembly;
- (b) a lower rod comprising four segments in the following order:
- (i) a stop segment having an intermediate diameter that permits the stop segment to be slidably insertable into the cavity of the upper rod;
- (ii) a set screw contact segment having a diameter less than the intermediate diameter;
- (iii) a spring holding segment having the intermediate diameter, and
- (iv) a terminal segment having an outer diameter larger than the intermediate diameter;
- (c) a coil compression spring having an inner diameter sufficient to receive the spring holding segment of the lower rod, and not sufficient to receive either the rim of the upper rod or the terminal segment of the lower rod;
- and
- (d) a set screw having threads that mate with the threaded opening in the upper rod.
Dependencies are inferred from the claim text.