US 5,399,058 A · Reversible pilot for valve seat machining devices

Abstract

A spindle with a self-centering grip, or collet, and one or more pilots that the grip may engage. The grip has radially expandable and contractible portions for engaging a pilot between them. The pilot is inherently centered in the spindle because the gripping forces are equally distributed around the pilot. Each pilot consists of two adjacent, coaxial cylindrical guide portions of different diameters. A set of such pilots can be provided where each guide portion of each pilot has a diameter that is different from that of every other guide portion of the pilots in the set. The guide portion diameters may correspond to the diameters of the valve guides of particular engines or may increase incrementally over a predetermined range. A pilot can thus be selected from the set to fit the valve guides of a particular engine.

Claims14

Dependent claims

An apparatus for centering a valve seat machining device with respect to a valve guide, comprising:

a cylindrical pilot;
a spindle for connecting to a drive portion of said valve seat machining device, said spindle having a spindle cavity defined by a cavity wall;
and
a collet having a plurality of resilient fingers for moving in a radial direction in response to relative axial motion between said collet and said cavity wall, and said fingers have inside surfaces defining a bore for retaining said pilot, the diameter of said bore selectably changeable in response to said relative axial motion.

1 more element

Dependencies are inferred from the claim text.

Reversible pilot for valve seat machining devices

Life of this patent

Reversible pilot for valve seat machining devices

Life of this patent

Abstract

Claims14