US 4,614,136 AGranted

Angularly adjustable mandrel assembly

AssigneeTri Tool Inc.

InventorJohn E. Pertle

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Abstract

A mandrel assembly is disclosed for use in a portable lathe apparatus for machining the end face of a hollow workpiece. The mandrel supports an orbiting cutting tool which machines the end face and defines a cutting plane. The angle of the longitudinal axis of the mandrel and, consequently the cutting plane which is perpendicular thereto, is angularly adjustable with respect to the central axis of the workpiece. This enables the formation of a miter cut on the end of the workpiece. Complimentary hemispherical surfaces having common centers located at the juncture of the cutting plane and the central axis of the workpiece allow the mandrel to be angularly adjusted in any direction.

Claims24

Dependent claims

A mandrel assembly for rotatably supporting a cutting tool against an end of a hollow workpiece such that the angle of a cutting plane, defined by the orbiting cutting tool, is universally adjustable with respect to a central axis of the workpiece comprising:

(a) mandrel means for rotatably supporting the cutting tool such that a cutting edge of the tool orbits about the mandrel means defining a cutting plane extending generally perpendicular to a longitudinal axis of the mandrel means;
(b) a mounting base having a central axis and a first hemispherical surface, the center of the first hemispherical surface lying on the central axis of the mounting base;
(c) radially extendable securing leg means attached to the mounting base for securing the mounting base within a hollow workpiece having a central axis such that the central axis of the mounting base is generally coincident with the central axis of such hollow workpiece;
(d) a mounting bracket structure having a second hemispherical surface complimentary to the first hemispherical surface;
(e) first attachment means attaching the mounting bracket structure to the mounting base such that the first and second hemispherical surfaces are in contact with each other and the center of the second hemispherical surface coincides with the center of the first hemispherical surface;
(f) second attachment means attaching the mandrel means to the mounting bracket structure such that the cutting plane always passes through the center of the first and second hemispherical surface;
and
(g) coupling means interposed between an end of the mandrel means and the mounting bracket structure to permit the lateral movement of the mandrel means with respect to the mounting bracket structure while prohibiting relative rotation therebetween, the coupling means comprising:
(i) a first anti-rotation means associated with the mounting bracket structure;
(ii) a second anti-rotation means associated with the mandrel means;
and,
(iii) a coupling means extending between the mounting bracket structure and the mandrel means, the coupling having at least a third anti-rotation means cooperating with said first and second anti-rotation means in such a manner that said mounting bracket structure and mandrel means can move laterally relative to each other but cannot rotate relative to each other.

9 more elements

Dependencies are inferred from the claim text.

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Abstract

(a) mandrel means for rotatably supporting the cutting tool such that a cutting edge of the tool orbits about the mandrel means defining a cutting plane extending generally perpendicular to a longitudinal axis of the mandrel means;
(b) a mounting base having a central axis and a first hemispherical surface, the center of the first hemispherical surface lying on the central axis of the mounting base;
(c) radially extendable securing leg means attached to the mounting base for securing the mounting base within a hollow workpiece having a central axis such that the central axis of the mounting base is generally coincident with the central axis of such hollow workpiece;
(d) a mounting bracket structure having a second hemispherical surface complimentary to the first hemispherical surface;
(e) first attachment means attaching the mounting bracket structure to the mounting base such that the first and second hemispherical surfaces are in contact with each other and the center of the second hemispherical surface coincides with the center of the first hemispherical surface;
(f) second attachment means attaching the mandrel means to the mounting bracket structure such that the cutting plane always passes through the center of the first and second hemispherical surface;
and
(g) coupling means interposed between an end of the mandrel means and the mounting bracket structure to permit the lateral movement of the mandrel means with respect to the mounting bracket structure while prohibiting relative rotation therebetween, the coupling means comprising:
(i) a first anti-rotation means associated with the mounting bracket structure;
(ii) a second anti-rotation means associated with the mandrel means;
and,
(iii) a coupling means extending between the mounting bracket structure and the mandrel means, the coupling having at least a third anti-rotation means cooperating with said first and second anti-rotation means in such a manner that said mounting bracket structure and mandrel means can move laterally relative to each other but cannot rotate relative to each other.

9 more elements