US1355888A - Dental abrasive or grinding disk - Google Patents

Description

G. O. BURLEW.

DENTAL ABRASIVE 0R GRINDING DISK. APPLICATlON HLED SEPT. 6, 1919.'

1 55,888. Patented Oct; 19, 1920.

a WMM A TTORNE Y UNITED STATES PATENT OFFICE.

GILDEROY 0. BURLEW, OF NEWARK, JERSEY.

DENTAL ABRASIVE 0R GRINDING DISK.

To a]? u ham. 1' i may concern Be it known that I, GiLnERoY O. BURLEW, a citizen of the United States, residing in the city of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Dental Abrasive or Grinding Disks, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it pertains to make and use the same. reference being had to the accompanying drawings. and to numerals of reference marked thereon. forming a part of this specification.

It is customary in dental work to employ wheels or disks fixed upon a revolving mandrel for the purpose of grinding, cutting, and polishing teeth. These grinding wheels or disks are mounted upon a steel mandrel and when so mounted the grinding wheel or disk becomes a rigid and unyielding body which causes great discomfort and pain in preparing abutments for crowns and bridge work.

Furthermore, the periphery of the grinding wheels or disks so mounted have a tendency to become irregular thereby causing great shock and impairing the efficiency of the work.

A grinding disk or wheel so mounted will run at an exact rightangle to the revolving mandrel upon which it is fixed.

The grinding disk is preferably made of a compound consisting of fine particles of carborundum or other suitable abrasive grit material together with an integrating medium of primary plastic or mixable nature and capable of hardening in homogeneous mass to the desired degree, as vulcanizable rubber or a suitable substance that will securely hold the abrasive particles, but will itself wear away as the particles wear away in the use of the disk. The disk, is primarily molded into shape from the compound while in a plastic or unsolidified condition. The composition of the disk is then solidified by vulcanization or wellknown treatment for hardening materials of this nature. The disk is preferably formed with an integral boss or hub projecting from one side thereof, said hub being. provided with an aperture which receives the mandrel on which the disk is mountedfor use.

The object of my invention consists in providing a disk of the character above de- Specification of Letters Patent.

Patented Oct. 19, 1920.

Application filed September 6, 1919. Serial No. 322,176.

scribed with an elastic or yielding central core preferably of rubber, although cork felt or any other resilient substance may be substituted which has the same resiliency and shock absorbing qualities as rubber, so that when fixed upon a revolving mandrel for the purpose of grinding, cutting or polishing teeth will not always run at an exact right angle to said mandrel, but owing to the resilient central core will operate at an obtuse-or acute angle to the mandrel.

The application of a resilient central core imparts to the periphery of the grinding disk or wheels, a certain amount of resiliency, thereby absorbing and taking away the shock from the tooth.

These objects I perform in the preferred embodiment of my invention, which I have illustrated in the accompanying drawings, to which reference is had, and in which similar characters of reference indicate corresponding parts in the several views.

In the drawings, I

Figure 1 represents, a plan View of my improved device.

Fig. 2 represents a sectional view taken on line mw of Fig. 1.

Fig.3 re resents, a plan view and side elevation of t e soft rubber core.

Fig. 4 represents, a plan view of that portion of the carborundum disk which subsequentlytogether with the soft rubber core, after being molded around and vulcanized together with said soft rubber core, forms the completed disk; and

Fig. 5 represents, a modified form of disk in which the soft rubber center is flush with the faces of the disk.

In describing the product forming my invention, I will simultaneously describe the process of the same, so that those skilled in the art to which it pertains, may gain a full knowledge of the process, as well as the product.

In the drawings, 1 represents, a disk suitable for abrading, cutting, polishing, etc., according to the work to be done.

The disk 1 is preferably formed with an integral boss or hub 2 projecting from one side thereof, said hub being provided with an aperture 3 by means of which it is secured upon the mandrel.

In the process of making these disks I employ the centralsoft rubber hub 3 illustrated in Fig. 3 of the drawin s, which is first placed into a suitable mol and I then surround said hub 3 with the material which Subsequently forms the disk and which consists preferably, of a compound consisting canization; there being no clear line of demarcation between suchhard and soft parts, thereby producing a disk with an elastic or yielding center core so that when fixed upon a revolving mandrel for the purpose of grinding, cutting, etc., it will not always run at an exact right angle to said mandrel, but owing to the resilient central core will 0perate at an obtuse or an acute angle to the mandrel, thus imparting to the periphery of the disk, a certain amount of resiliency,

thereby absorbing and taking away the shock from the tooth.

Experience has demonstrated that the device above described is a highly 'eiiicient one and while the device shown is the preferre embodiment of my' invention, I do not care exercise of invention may be made by any skilled mechanic, and such de artures from what is herein described and ciiiimed not involving invention, I consider as within the scape and terms of my claim.

claim The rocess of forming abrasive or grinding'dis s, consisting in molding around an elastic or yielding center core of rubber adapted for soft vulcanization, a body of abrasive grit together with an integrating medium of prlmary lastic or mixable nature such as rubber a apted for hard vulcanizationand capable of hardening in homogeneous mass, giving the central core a soft vulcanization and giving the body of the disk a hard vulcanization.

This specification signed and witnessed this 29th day of Au st 1919.

GILD ROY O, BURLEW. Witnesses:

EDWARD A. Grr'r, FREDK. G. FISCHER.

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