US 3,986,303 AGranted

Radially adjustable grinding wheel for grinding concave surfaces to constant primary and secondary radii

AssigneeNorton Company

InventorLoring Coes, Jr.

Life of this patent

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Abstract

A lens grinding machine with a radially adjustable work holder on which various sizes of lens carriers with lens blanks to be ground, may be mounted and moved at various predetermined radii across the peripheral abrasive surface of a radially adjustable grinding wheel rotatable in a plane normal to a plane of movement of the lens blanks. The grinding wheel has a slotted support center with flexible and resilient deformable walls supporting bonded abrasive segments containing alkali insoluble metal coated abrasive in an alkali soluble metal bond and is mounted on an arbor adapted with means to clamp the wheel and to vary the shape of the deformable walls and radius of the wheel. Wheel truing means are provided which heats and rotates the grinding wheel into forceful engagement with an adjustable rotatable truing roll to soften and form the peripheral surface of the wheel to the desired radius which is then dressed by an application of an alkali solution to remove only a sufficient amount of the metal bond to expose the peripheral abrasive elements.

Claims7

Dependent claims

A radially adjustable grinding wheel for grinding concave surfaces to constant radii comprising:

a circular slotted support center of predetermined initial minimum diameter and radius from its axis of rotation having
at least one relatively thin deformable, integral, circular, sloted wall,
a hub portion about the axis of rotation,
a plurality of radial slots angularly spaced around and extending radially outward from the hub portion to angularly spaced narrow peripheral surface portions of greater length than axial thickness extending between the radial slots, and
a plurality of relatively thin deformable wall portions of predetermined shape between the angularly spaced radial slots and having
a length greater than the initial minimum radius when measured in a single radial plane along the wall portions between the peripheral surface portions and the axis of rotation and which upon being deformed varies the diameter and radius of the support center and grinding wheel;
a plurality of angularly spaced bonded abrasive segments fixed to the peripheral surface portions of the support center;
and
wheel mounting means, in the hub portion of the center, for attaching the grinding wheel to a wheel drive spindle for rotation about the axis of rotation, deforming the wall portions to vary the diameter and radius of the wheel and maintaining the center and the grinding wheel fixed against axial movement and at a predetermined constant radius and diameter during grinding of the concave surfaces.

6 more elements

A radially adjustable grinding wheel for grinding concave surfaces to constant radii comprising:

a support center of predetermined initial minimum diameter and radius from its axis of rotation having
a pair of axially aligned, relatively thin, slotted, side walls fixed together at angularly spaced peripheral surface portions of the support center and each side wall having
a hub portion about the axis of rotation,
a plurality of aligned radial slots angularly spaced around and extending radially outward from the hub portion to the angularly spaced peripheral surface portions between the radial slots, and
a plurality of relatively thin deformable wall portions of predetermined shape between the angularly spaced radial slots and having
a length greater than the initial minimum radius when measured in a single radial plane along the wall portions between the peripheral surface portions and the axis of rotation and which upon being deformed varies the diameter and radius of the support center and grinding wheel;
a plurality of angularly spaced bonded abrasive segments fixed to the peripheral surface portions of the support center;
a wheel mounting arbor in the hub portion of the center having
a threaded portion extending coaxially through an arbor hole in each hub portion;
a pair of spaced flanges on the threaded portion of the arbor in clamping engagement with opposite sides of the support center and movable axially relative to each other to clamp the center therebetween and to vary the shape of the deformable wall portions, the diameter and radius of the support center and grinding wheel;
and
attaching means on the arbor for attaching the arbor and grinding wheel to a wheel drive spindle for rotation about the axis of rotation.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/577,726Filed 15 May 1975 · division
Priority: 27 Feb 1974
Granted: 19 Oct 1976
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B24D 5/00
Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting
B24B 13/026
By means of tools with abrading surfaces corresponding in shape with the lenses to be made: the contact between tool and workpiece being a line
B24B 27/0069
Other grinding machines or devices: with means for feeding the work-pieces to the grinding tool, e.g. turntables, transfer means
B24D 5/06
Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor: with…