Spring-loaded live center
AssigneesOmer H. Schook, Alan A. Zaremskas
InventorsFrancis Wolski, Alan A. Zaremskas
Life of this patent
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Abstract
A spring-loaded live center formed by an adapter mounted on a ball bearing live center. The adapter includes a hollow locating housing arrangeable on the live center, a center slidably arranged in a central bore of the hollow housing, and a spring disposed within and extending from a recess provided in the center. The spring biases the center against the live center. A longitudinal groove and a wedge-shaped groove are provided in the center for permitting screws, and the like, disposed in holes provided in the housing to cooperate with the grooves and limit the sliding movement and to lock the center, respectively, relative to the housing.
Claims1
An adapter for converting a ball bearing live center to a spring-loaded live center, comprising, in combination:
- a. a hollow locating housing arrangeable onto a live center;
- b. said housing having a workpiece locating end face;
- c. a center provided with a recess and slidably arranged within the hollow housing;
- d. a spring arranged within the recess of the center and extending therefrom for abutting the live center;
- e. a pair of holes diametrically opposed to each other provided in the housing and communicating with the central bore of the housing;
- f. a longitudinal groove provided in the center and arranged for matching with one of the holes:
- g. a wedge-shaped groove provided in the center and arranged for matching with the other of the holes when the longitudinal groove matches the one of the holes;
- h. a pair of elements arranged in the holes for projecting into the grooves, one of the elements projecting into the longitudinal groove for limiting the length of travel of the center in the bore relative to the housing, and the other of the elements projecting into the wedge-shaped groove for locking the center in a predetermined position relative to the housing;
- and
- i. the housing is provided with a counterbore arranged for fitting over a boss-like end of the live center which forms a live center locating diameter, and with thread means arranged in the counterbore for engaging with cooperating locating diameter threads, the locating diameter forming a face against which the spring abuts.
Dependencies are inferred from the claim text.