US895641A - Polishing-wheel. - Google Patents

Description

PATENTED AUG. 11, 1008.

J. W. HYATT.

POLISHING WHEEL.

APPLICATION FILED APR 17 1907 UNITE STATES PATENT OFFICE.

JOHN W. HYATT, F NEWARK, NEW JERSEY.

POLISHING-WHEEL.

To all whom it may concern:

Be it known that I ,J OHN W. HYATT, a citizen of the United States, of 141 Commerce street, Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Polishing-Wheels, fully described and represented in the following specification, and the accompanying drawings, forming a part of the same.

The object of the invention is to reduce the cost and improve the quality of that class of wheel-bodies upon which abrading material is cemented to be used in polishing and grinding. Such wheel-bodies have been made of wood, leather, and other substances, but none of them is ca able of preserving the form of the wheel perfectly, as wood shrinks unevenly, and the texture of leather is affected by heat or moisture.

The wheel-body in the present invention is formed of a yielding fibrous substance, as jute or hair felt, saturated with so-called printers roller-composition ,which is made of glue and glycerin and which has the prop-' erty of setting or hardening to a certain point and thereafter retaining a soft yielding character .and permanent elasticity.

The composition can, without losing its yielding character, be made readily heatresistant and water-resistant'by the admixture of formaldehyde.

Hair felt of cheap or coarse grade is preferable, as it is very cheap, and when saturated with the printers roller-composition and the composition hardened to its normal point. it possesses a perfectly elastic yielding surface which is of the very best character for supporting the abrading material in a grind ing or polishing operation.

In such an operation, it is desirable that the abrading material should be sup orted elastically, that it may operate unifhrmly upon various uneven convex and concave surfaces which require to be polished, and the wheel-body thus constructed possesses such permanent yielding surface, and a very homogeneous consistency. a

The animal or vegetable fiber when disposed irregularly, as in a felt or mat, imparts strength to the wheel-body which resists the centrifugal force to a certain point, and'the wheel-body may be made of a single disk, or of a series of disks cemented together, but where a high speed wheel is desired, it may be formed of a series of disks cemented together with intermediate layers of woven Specification of Letters Patent.

Application filed April 17, 1907. Serial No. 868,629.

Patented Aug. 11, 1908.

fabric, such layers serving to increase the strength of the wheel and resist the centrifugal force. As the printers roller-composition contains glue, it can be used as a cement; and a perfectly homogeneous quality thussecured in the binding material.

The invention will'be understood by reference to the annexed drawing, in which I Figure 1 is a side view, and Fig. 2 an edge view of a disk embodying the invention; and Fig. 3 is a transverse section of a wheel comprising a series of such disks with intermediate canvas layers, and a flanged hub seccured in the disks. Fig. 4 is a side view of the wheel-hub.

In the manufacture of the disks, hair felt, such as is used for boiler felting, is cut into circular sheets of the desired size and placed in a heated mold containin a fresh fluid mixture of glue, glycerin and water, of suitable proportions to form a stiff jelly when cold, the quantity of mixture being sufficient to saturate the felt. the mold and slowly pressed to reduce the saturated felt to a suitable thickness, in most cases about one-third of its original thickness. The pressure density of texture re uired for the grade of grinding material to e carried and the nature of the work for which the wheel is intended. A lighter pressure is used where a disk of softer or more spongy texture is desired, and a heavier pressure roducing a more firm and solid texture, suc

ferent kinds of grinding work.

Where the disk is to be used alone, as rep resented at a in Fig. 2, a hole I) of suitable size is formed in the center, as shown in Fig. 1,

A cover is placed upon variations in the body of the wheel being desired for difis graduated to produce the for securing it upon a spindle, and the diskis pressed hard enough to give it the strength re uisite to prevent burstm when rotated.

f a wheel of considera le, thickness, as several inches, is required, then a series of the disks is formed as just described, of sufficient number to make the wheel, and the disks are then cemented together and to intermediate layers of.canvas c by the same fluid composition, with the iron hub d in the center having a thin star-shaped or toothed flange e to firmly engage the center disks of the wheel.

The group ofdisks with their hub is firmly pressed together and .upon such flange, and aked at a' temperature of about two hundred degrees for several hours. Such baking involves a very great ex ense, or of wood which does not remain tru y circular, and the present invention furnishes -a wheel-body which is superior in quality to either of these materials as it is homogeneous in texture, and possesses when roper y made a slight yieldmg quality whic is of great value in support ingand operating the abrasive materia a. The wheel-body furnishes a new article of manufacture which may be made up in assortments of dimensions ready for use by grinders and polishers in many different arts.

Having thus set forth the nature of the invention what is claimed herein is:

.l. A polishing wheel comprising yielding hair felt saturated and cemented together with printers roller-composition of per- 'manently yielding character.

' 2i A polishing wheel comprising a yieldingfibrous material saturated and cemented together with printers roller-composition of "permanently yielding character and rendered v heat-resistant and water-resistant by the admixture of formaldehyde.

3. A polishing wheel com rising a series of disksform'ed of a yielding 7 air felt material saturated with printers roller-composition of permanently yielding character rendered heat resistant and water resistant b the admixture of formaldeh de, the dis being cemented together wit alternate layers of woven fabric by-a cement of roller-composition, the layers of woven fabric serving to resist the centrifugal force developedin rotating the wheel.

4. A olishin wheel comprising a central hub wit a toot ed flange intermediate to its ends, disks of-compressedhair felt applied to the hub at opposite sides of such flange and pressed thereon and cemented together by permanently yielding printers roller-comvposition, the pores of the disks being also lled withthe printers roller-composition of permanently yielding characterrendered heat-resistant and water-resistant by the admixture of formaldehyde.

In testimony whereof I have hereunto set my hand in'the presence of two subscribing witnesses.

JOHN w. HYATT.

I Witnesses: I

..L. LEE, THOMAS SI CRANE.

Images