US 6,473,965 B2 · Method for installing valve locks

Abstract

A hand tool that greatly expedites the installation of the valve locks that secure a valve spring retainer to the free end of a valve stem. The valve locks include an inwardly extending ridge that engages a circumferential groove that extends around an end portion of the valve stem. The valve lock is retained in this position by a tapered central bore of the valve spring retainer that produces an inward clamping force on the valve lock. The tool includes a plunger having a diameter equal to the diameter of the valve stem. The user positions the valve locks on the protruding cylindrical surface of the plunger, where they are held by magnetic attraction. The user pushes the end of the tool against the valve spring retainer, thereby compressing the valve spring so that the valve stem pushes the plunger into a close-fitting loader end cap until the valve locks are transferred to the valve stem and into engagement with the circumferential groove.

Claims10

Dependent claims

A method for seating a valve lock into a circumferential groove located adjacent an end of a cylindrical valve stem, comprising the steps of:

a) providing a cylindrical plunger having the same diameter as the cylindrical valve stem;
b) inserting the plunger into a bore that extends through a loader end cap, the diameter of the bore permitting the loader end cap to slide in a loose sliding fit along the plunger and along the valve stem;
c) slidably adjusting the plunger within the loader end cap until an end portion of the plunger protrudes out of the loader end cap;
d) placing the valve lock onto the cylindrical surface of the protruding end portion of the plunger;
e) holding the end of the plunger against the end of the valve stem with the plunger aligned with the valve stem;
f) while holding the plunger in end-to-end relation with the valve stem, advancing the loader end cap toward the valve stem so that the advancing loader end cap pushes the valve lock along the plunger then onto the valve stem and along the valve stem until the valve lock seats in the circumferential groove.

3 more elements

Dependencies are inferred from the claim text.

Method for installing valve locks

Life of this patent

Method for installing valve locks

Life of this patent

Abstract

Claims10