US2569929A

US2569929A - Rotary abrading tool

Info

Publication number: US2569929A
Application number: US70474A
Authority: US
Inventors: Elisha W Hall; Albin S Rock
Original assignee: F L & J C Codman Co
Current assignee: F L & J C Codman Co
Priority date: 1949-01-12
Filing date: 1949-01-12
Publication date: 1951-10-02
Anticipated expiration: 1968-10-02

Description

Oct. 2, 1951 HALL ET AL 2,569,929

ROTARY ABRADING TOOL Filed Jafi. 12, 1949 2 Sheets-Sheet 1 g CREE)??? 110 y 7 (9 7 4 MM wigs Oct. 2, 1951 w. HALL ETAL ROTARY ABRADING TOOL 2 Sheets-Sheet 2 Filed Jan. 12, 1949 1:10am? z" Ezizshasw 312 6 r 0 C (/11 3 a Patented Oct. 2, 1951 Elisha -W..Hall, Scituate, asa- Albin .S. Rock, East .Bridgewatcr, Mass, assignorsto -F... L. & J. 10.

"Codman Company Application January. 12, 1949, SerialNo. 70,4 74

.8.Claims. (01. 51-493.)

This invention is concerned with flexible, rotary cylinder, abradingutoolsof the kind known as tin-platetrollers, .and:assembled.by providing along;squarezshaftto' whichcmany sections hav- 'mgsquare openings are applied: by pushing them, one at'ai time, alon theshaft under great pressure untiltheshaftis filled compactly to provide -a-firmaworking surface. According to one type oflsection the. squarexopening is out directly in the: cotton..plies,. so that the: cotton contacts-the shaft. There are several objections attending this type,.:among.which. are (1) lack: of stability of the cotton pliespwhen. pressing. against a cooperating roller, with consequent tendency of. the section tosbecome .out-of-round. dueto: the square shape of'the hole and to the lack of: uniformity ef thethickness of the cotton aboutithe shaft, and (2) the difficulty of preventing the sections from retreating as theyare pushed along the shaft, one by one, -by axial "pressure. "Both objections are overcome by the construction which is-the subject matter of this invention. "The invention will best be understood by reference to' the following description when: taken in connection=with the aceompanying drawings i1- lustrative of certain embodiments thereof, "while its scope will be'pointed outmore particularly in'the appendedclaims.

In the drawings Figsl is anelevation of a section to be applied to a-square shaft to build up a long roller;

Fig. 2 is a, sectional view on line 2-2 of Fig. 1;

Fig. 3 is an-elevation of a modified section; and

Fig. 4-is a, section on-.line':4-=4'of'Fig. .3.

Referring to the drawings andrtoithe'sembodiments of the invention. illustrated therein by way of example, and having reference, at first, to Figs. 1 and*2, there is shown an abrading toolcomprisinga'hubless ringd of abrading material, such as cotton; composed of many i layers secured together as by a circular row of stitches 6, through and through, (see Fig. 2). Usually, the layers are made up by a continuous strip of bias-cut material pieced together at intervals by stitches. instead. of making the section with a square hole to fit the shaft, there is provided a circular hole I.

To the body of abrading material, as thus constituted, there are secured disks 8 and ID of material, such as hard fiber, as by adhesive, and having square apertures I2 and M to correspond with the square shaft to which the rings are to be applied. The apertures are usually somewhat smaller than the internal diameter of the ring of abrading material. This leaves arc-shaped voids -.,between the *corners of the apertures l2 31116.:14. The ringyhaving. acircularhole, has-a i-uniform.-cross-sectional. form, so that thering .does not tend to become outof-round. square form to fit .th shaft is furnished solely by the hard fiber disks 8 and Ill with theirsquare apertures 12 and M. The. fiber disksaresufllciently hard and strong to perform this service, because -.there are many sections on a. shaft, (sometimes 48" and sometimes 72" long) The arc-shaped voids left about thesquare. apertures l2- and [4 do not" impair the. strength of the: ring, in the case of small diametersof sections, fact,thereissomething. to be gained by having thearcz-shaped spacesat intervals so that the unsupported edges of the diskscarr approach each other underthe; pressure endwise of. the massof sections,.:as .a hydraulic ram'pushes them-into place upon theshaft. Thus,.the free walls of. the 'disksten'd' to hug the shaft as the pressure iszapplied.

, 'This-tendency to'hug the shaft may be-.increased byzproviding means, such as a one-dimetionalwolut'ch, for: frictional. engagementwith the shaftas the ring. is. movedalong the haft in one direction only, during the application of thering ainderipressure, .to the. shaft. One convenient means,.:and the-one which we prefer to. employ, will now .zbe: described, referring first to :Fig. 2. Thiszmayzbeapplid to both disks, if desired, but inithig embodiment. it.;is applied: to only-one. disk. The aperture l2, 5 in this case; is. much smaller thanrthenshaftto which thetsectionis to be applied, so ithatiitsqmargin willbear againstrthe 'shafttfirmly. T01 this ehdpthg. disk BiSFformed, asiniwdies, toxproduce' marginal slopes l 6. and slits l 8 (see Fig. 1) in the form of a truncated pyramid, oriotherssuitable. shape, to cause the margin; of the: aperture I21- to grip the shaftv firmly" andlxto cause the. .disk :8. to tbendsomewhataas shownlby the zdottedz lines A, Ain Fig. 2. .ThesarrowiB shows the direction of the motion of the ring along the shaft. Thus, any backward tendency is resisted, as the pressure of the ram is relieved pending the placing of other rings on the shaft. The margin of the aperture l2 thus creates a ratchet effect along the surface of the shaft owing to the crimping in the square aperture.

In the case of large diameter sections, (see Figs. 3 and 4) much larger than usual, (sometimes as much as 12" or more in diameter) it is sometimes desirable to fill the voids, partially, while leaving some space by providing a filler 20 of some suitable material such as chipboard between two

hard fiber disks

22, 22, and spaced slightly therefrom, as by

spaces

24, 24 on opposite sides of the filler 20. While the filler furnishes some reinforcement to the section, in the case of large diameter disks, nevertheless advantage is taken of the presence of voids, so that the disks 22 can bend and hug the surfaces of the shaft. Thus, in this case, the disks are not unsupported between the corners of the square apertures 26 of the disks 22. On the other hand, there is sufficient gripping of the edges of the apertures to furnish the desired holding of a section when the pressure of the ram is released during the application of a second section. However, in this case, also, if further gripping is found desirable, the disks can be provided with marginal slopes like those hereinbefore described in connection with the first form. (See Fig. 2.)

Having thus described these embodiments of the invention, what we claim is: 7 I

1. Infan abrading tool, the combination of an; abrading ring for application to a shaft along with others to form a roller, and means carried by said ring including a disk having an aperture' whose margin is formed as a part of a pyramid.

2'. In an abrading tool, the combination of an abrading ring for application to a shaft along witli others to form a roller, and means carried by-said ring including a disk having an aperture whose margin is formed as a part of a pyramid and having slits extending outward from the edges of the aperture.

1 3. An abrading tool for mounting on a square shaft comprising an annulus of abrading materialbounded by outer and inner cylindrical surfaces, the latter being substantially larger than the cross section of the shaft, and a pair ofdiscs of substantial radial stiffness secured to the sides of the annulus to support it concentric with the center line of the shaft, the discs having square openings to fit the shaft, the assemblypresenting a clearance inwardly of the discs adjacent said openings to permit inward 'flexure of the discs into the interior of the annulus.

'4. In an abrading tool the combination with an abrading ring for encircling application to a shaft and a disc of radially stiff material overlying a radial face of the ring and having an opening to fit the shaft, the margin of the opening having a laterally deflected portion to bear obliquely on the shaft to yield outwardly therefrom when moved along the shaft in one direction, but whichwill bend inwardly to jam against the shaft when movement in the opposite direction is attempted.

5. In an abrading tool the combination as defined in'claim 4 wherein the disc has a plurality of such deflected portions symmetrically arranged around the shaft to function while the disc maintains a perpendicular relation to the shaft.

6. In a flexible, rotary abrading tool, the combination of a flexible, open-centered abrading ring to be combined with like rings by axial pressure on and about a non-circular shaft to constitute a roller for tin-plate manufacture,

said ring having a circular opening of greater area than the cross section of the shaft, and

two disks of substantial radial stiffness aflixed to opposite sides of said ring, each disk having an opening to fit the shaft, the disks supporting thering from the shaft, the space between said disks and within the inner circumference of the ring being empty.

7. In a flexible, rotary abrading tool, the combination of a flexible, open-centered abrading ring to be combined with like rings by axial pressure on and about a non-circular shaft to constitute a roller for tin-plate manufacture,

said ring having a circular opening of greater area than the cross section of the shaft, two disks of substantial radial stiffness aflixed to oppositesides of said ring and having openings to fit the shaft and a filler between said disks having a central opening to fit the shaft and underlying and supporting the internal circumference of the 'ring there being a clearance between the lateral sides of the filler and said disk to permit inward flexure of said disk into the space within the ring. 8. An abrading tool for mounting on a square shaft comprising an annulus of abrading material bounded 'by outer and inner cylindrical surfaces, the latter being substantially-larger than the cross section of the shaft, and a pair of disks 'of substantial radial stiffness secured to the sides of the annulus to support it concentric with the center line of the shaft, the disks having square openings to fit the shaft, the assembly presenting a clearance inwardly of the disks adjacent said openings to permit inward flexure'of' the discs into the interior of the annulus, at least one margin of at least one of the disks being bent laterally'to provide a portion which may bend further outwardly when slid over the shaft in one direction, but is bent inwardly to jam against the shaft when movement in the opposite direction is attempted.

' ELISHA W. HALL.

ALBIN S. ROCK.

REFERENCES CITED The following references are of record in the file'of this patent:

UNITED STATES PATENTS Number Name Date 2,132,532 Hall Oct. 11, 1938 2,284,425 Henry et a1 May 26, 1942