US921027A - Buffing-wheel. - Google Patents

Description

' I G.,S. TENNEY.

BUPFING WHEEL.

APPLICATION TILED JUNE 1, was. I

921,027, Patented May 11, 1909.

lll llllED SitATlEtfl GEORGE S. TENNEY, OE WALPOLE, MASSAt'HUSETlS, ASSIGNOR TO AMERICAN GLUE COM.-

A CORPORATION OF MASSACHUSETTS.

BUFFING-WHEE L Specification of Letters ?atent Application filed June 1,

Patented May 11, 1909.

1903. Serial No. 435,332.

T all whom it may concern:

Be it known that 1, Giaonon S. Tanner, of ll alpole, in the county of Norfolk and State of Massachusetts, a citizen of the United States, have invented a new and useful linproveinent in Buliing-ltheels, of wl'iich the following is a specification.

A buffing wheel or drum having a. detachable surface oi sandpaper or the like is ordin arily made of wood or nietal provided with a suitable hub by which it is mounted upon a shaft and its rial is surrounded by a tire of felt or other fibrous Er-rterial. .lbout the rin of felt is wrapped a l yer of sandpaper or the like and the diliiculty with devices of this character has been to attach the sandpaper in such a way that it 1y be quickly and easily removed and a fresh piece substituted and the same time the sandpaper shall not overlap nor present any protuberance where the two ends meet. Various means have been devised for accomplishing this end, but the chanis u which i have shown. below 1 believe to be the simplest and consequently the least expensive and at the same time to be the most eliective for the purpose.

My invention will be understood by reference to the drawings, in which Figure 1 is a side elevation of a buffing wheel embodying my invention, Fig. 2 being a section on line 22 of Fig. 1. Fig. 3 is a sectional detail showing the construction and operation of the grippers for holding the ends of the paper, and Fig. l is a detail in plan of the under or inner side of the cam.

A is the wheel proper which may be of wood or metal and is provided about its rim with a cushion B of felt or the like.

O is a strip of sandpaper of a width corresponding to the width of the rim of the wheel, the strip being somewhat longer than the circunrl'erence of the wheel in order that its two ends 0, 0 may pass down between the ends of the cushion l3 and into the radial slot (bill the wheel.

T he wheel is chambered as at D, two of the walls of the chamber being parallel with the outer walls of the wheel, and two other walls being radial so that the chamber is narrower near the axis of the wheel than near its periphery. The top of the chan'aberis partially closed by the pieces (Z, d, between which is the slot a above referred to, these pieces serving as bearings for the ends of the cushion and providing an entrance into the chamber for the ends of the strip O.

E is a grip comprising jaws 0 each mounted on the end of an arm c the arms being pivoted together at and held normally separated from each other by a spring c setting into suitable cavities 0* in the arms a. This grip lies in the chamber D and when in its opened position as shown in dotted lines in big. 3, its arms are separated by the spring 0 so as to all rd ample. space for the insertion between bile/ill of the ends, 0, c of the sandpaper strip C. The jaws c are provided. with surfaces for engaging the sandpaper, the form of surface which now seems to me best being that shown in the drawings where the end of one of the jaws is concave, the end of the other being convex and adapted to force the ends of the strip into the concave j aw as shown in Fig. 3. This gripping operation is eilected by a radial inward pull given to the grip, the arins oi the grip and consequently its aws being forced together by the narrowing up of the chamber D as it approaches the axial portion of the roll.

The wheel a is provided with a hub l which is attached thereto by means of screws or in any other suitable way, a llangef being provided for that purpose on one end of the hub. The farther end of the hub carries a earn G which sets into a suitable cavity in the wheel A and is held in place by a ring H screwed to the side of the wheel. This cam is free to be turned and on its under surface it is grooved spirally as shown at g. 51 pin g attached to the pivot of the grip lies in the spiral move 9 and as the cam is turned the spiral groove draws the grip either inward to tighten the paper or outward to loosen it as may be necessary.

ihe operation of the device will be easily understood. It being desirable to cover the wheel for buiiing purposes, a strip of sand paper or the like of the proper width and length, is wrapped around the wheel and the grip being open as shown in dotted lines in Fig. 3, the two ends of the strip are pushed down into the slot (5, the strip being stretched as tightly as may be by hand about the rim of the wheel, the ends being bent over the edges formed by the two ends of the felt as smoothly as possible. The earn G is then turned to draw the grip inwardly toward the axis of the wheel by means of the groove 9 and pin g and while so doing the side walls of the chamber D force the aws oi the grip together so that they bite upon theends of the strip and pull the strip tight about the wheel. The wheel is then in condition for use. To release the strip the can is turned in the reverse direction which pushes the grip outward froin the axis oi the wheel, the spring a causing the aws to separate and release the paper so that it may be easily withdrawn by hand.

The simplicity of this device is such that it would appeal to anyone skilled in the ar Comprising as it does but three parts it can not easily get out of order, and moreover the working parts are so protected, being inclosed within the wheel, that they cannot be injured in any way. The radial movements are positive owing to the use of a can groove and pin by which they are caused, and the jaws acquire a fir-n hold on the paper by reason of the radial character of the walls of the chamber which cause the jaws to come together a d acquire a iirsr. hoid on the paper. There is no tendenev of the parts to loosen owing to the shape or the earn groove and the relation oi the ca thereto, and the arrange ent as a whole ailows the apparatus to perform its functions oi stretching and holding the paper and releasing it with the least possible i anipulation.

I do not inea to lli'i lt my invention to the precise construction shown in the drawings as its details ay be varied without departing from the spirit thereof. The wneei shown has concave periphery but 1 vention applies equally to a wheel h. convex or fiat periphery.

il hat I claim as my invention is:

1. T he builing wheel above described provlded wlth a chamber having an opening to I receive the ends of a strip of abrasive paper,

a grip located within s id chber, means for giving said grip a radial ovenient and means i'er closing the jaws of said grip during its inw rd radial nioveinent.

The buiiing wheel above described provided with a CllfitiilbQl having an opening to receive the ends of. a strip of abrasive paper, a grip located within said chamber and pro- 50 vided with jaws, means for keeping said jaws normally open, and means for giving to said grip radial movement, said chamber having radial walis adapted to engage said jaws and t ey are drawn invmrdiy to close they aga 1st one another.

The outhi'ig wheel above described provided with a eher having an opening to receive the ends of a strip oi' abrasive paper, a grip located within said ch her and provided with jaws, means for seeping said jaws nor aliy open, and means [or closing said aws on the inward radial ntovernent thereof, and ans for .oving said jaws ini pin located on said 1 ans whereby said can i as set forth.

wheel above desorioed provided with a shaped eha :rber having opening to receive the ends oi a strip of abr j sive paper, a grip located wit nn. saii chair her and provided with aws, eans ior keepllv ouen means to close ng, and a can located on said central bearing and adapted to engage said grip and move it back and iorth radlaliy as described.

8. T NEY.

GEORGE its

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