US445749A - deyenport - Google Patents

Description

314m Ea -5 (No Model. 3S11eets-Sheet 1.

A. K. DEVENPORT. SANDPAPERING MACHINE.

No. 445,749. I Patented Feb. 3, 1891.

fillllllllll mineases (No Model.) 2 Sheets-Sheet 2. A.K.DEVENPORT. SANDPAPERING MAUHINE. V Patented Feb. 3

STATES "TENT.

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ARTHUR K. DEVENPORT, or JAoKson, MICHIGAN, ASSIGNOR or ONE-HALF TO s. HEYSER & sons, or SAME PnAoE.

SANDPAPEiNG-MAGHlNE.

SPECIFICATION forming part Of Letters 2atent No. 445,749, dated February 3, 1891.

Application filed September 26, 1888. Serial No. 325,122- (No model.)

To all whom itmay oonccrm Beit known that i, ARTHUR K. DEiIENPoR'r,

a citizen. of the United States, residing at arbor and arranged to be rotated at high speed, thc disksbeing free at their outer edges.

In the drawings, Figure 1 is a perspective view of a machine designed to carry out my improvements, one of the disks being shown in position upon and the other removed from the arbor; Fig. 2, a sectional viewof the parts in position; Figs. 3 aud t, similar views showing modifications; Figs. 5 .and -6, enlarged Views designed to illustratethe action of the machine; Figure 7, a viewillustrating means for'adjusting the bridge or work-support independently of the table.

Prior to my invention machines for sand-papering panels and other wood-work have been constructed with two disks or'rotary heads,

each faced with sand-paper or other abrading material, which material has, however, been tightly drawn or stretched over the face of the disk or head and clamped or bound at the edges. To prevent the outer edges of the disks or heads thus covered from mar-ring the work, it has been customary to round off or bevel them; but as a result of such construction it has beenimpracticable to work close up to the edges or boundaries of the raised portion of the panel, ,and in attempting to do so the edges have unavoidably been cut away. In other words, one of two difliculties has inevitably resulted from the use of abradingdislrs having fixed edges-failur'e to dress the entire face of the sunken portion or cutting away the edges of the raised portion. I avoid these difiiculties and attain most satisfactory results by the employment of the free-edged itbrading-disks in the manner explained beow. i r

A indicatesastout frame, which may be of wood or metal; B, an arbor provided with a band-pulley G and mounted in boxes or.bear-,

ings D upon the frame A, and E E two disks of sand-paper orother suitable material, as

emery-paper or cloth, applied to said arbor and arranged to rotate therewith, the disks being clamped in any suitable manner at their central portions, but free at their outer edges.

These parts are all that are essential to the carrying out of my invention; but better results may be secured by the adoption of the further parts and features indicated in the drawings. Thus in practice I find it advantageous to employ two disks F F, one back or outside of each of the abrading-disks E E, to

prevent the latter from falling over, buckling, or otherwise getting, out of shape, and a spacing collar or disk G between the abradiug-disks, to serve the double purpose of determining their distance apart and of aiding in clamping. them.

The outside or supporting disks are preferably made of metal and quite thin, theirinner or opposing faces being slightly beveled or curved outward toward their peripheries, as best shown in Figs. 5 and 6. is formed with a reduced end portion, as shown in Figs. 1 and 2, and with a fixed collar or shoulder a, against which one of the supporting-disks rests, and abrading-dlisk E coming next, then the spacing-collar G, then the outer abrading-disk, followed by the sec= ond'supporting-disk h, and lastly by a nut H, which screws upon the threaded end of the arbor and binds the several disks together and secures them so firmly to the arbor that they rotate therewith. A feather or spline The arbor B may be provided to prevent the several disks from turning upon or independently of the arbor; but this is not important and is not ordinarily used. By varying the thickness of the spacing disk or collar G the distance between the abradingdisks may be varied and determined asrequired. A like'result may also be attained by either of the modifications illustrated in Figs. 3 and 4.

In Fig. 3 I have shown a separate arbor B for each of the abrading-disks with its backing or supporting disk, one of the arbors being longitudinally adjustable in its bearings IOO LII to permit variation of the distance between the disks. fork seated in a circumferential groove in the arbor B','has swiveled in it an adjusting-n screw J, the stem of which screws into asuitably-threaded socket in-*one of the bearings represented as passing centrally or axially through a tubular arbor B", the tubular arbor being formed with a longitudinal slot 1) to receive a screw 0, which serves to clamp the 1 central arbor and hold it firmly in'any desired relation to the fixed arbor. The term fixed as-abve employed has referenceonly to longltudinal'movement, it being understood, of course, that both arbors rotate.

I. It is not essential that more than one abradin'g-disk be used, though it' is generally de-v sirable to dress or smooth, both faces of the work, and 'will therefore be desirable "ordinarlly to employ the two. If but one be'uscd, any form of support, either the supportingd1sk F or afixed support, may be used to keep the work in position while being acted upon by the abrading-disk.

K indicates a bridge-piece extending-between the disks from one end of the slot (1' of the work-tableL to the other end threofiits purposebeing to sustain the work while passing between the disks and to limit its'desce'utv between them. The work table is hinged or 7 otherwise made adjustable as to height, and

by raising or lowering it the depth to which the work may enter may be regulated and 'variedat will.

Referring now to Figs.- 5'and 6,-the principle of operation will be more fully'explamed. Fig. '5 represents the ab'r'adingdISkS as they appear when at rest, their flexibility permitting them to fall back against the supporting-disks or away from them, as may be. Fig. 6 represents the position which the'fiexible disks will assume if. the outside supportingdisks be omitted or if they be conslderably beveled; so as to-"lea've acornparatlvely wide space between -the'plane of the abrading-disks a'ndthe inner faces of the supportingdisks. Under such conditions the centrifugal force due to the high speed of rotation will cause the abrading-di'sks to straighten out in planes perpendicular to the axis of the arbor,-as indicated; butif the'outside or supporting disksbe not considerably beveled the abrading-disks will hugclosely to them by reason of the expulsionof air'from between the abrading' and the supporting disks and the pressure .of the'air'upon-th'e abrad1ng-faces-a fact developcdlin practical use of the machine, Theb'ridge K may be ad usted by means of set-screws, as indicated In Fig. 7, without altering the elevation of the table- The elevation of the work-table or its A-yoke I, having the arms. of itsbridge being properly regulated, the free edges of the abrading-disks will work up to but never beyond the required point, and as a consequence the sunken, reduced, or beveled outer portions of .a panel orlike piece of work may-be perfectly-dressed evenup to and in the angle form d b the meeting ,i

-chineis referred to under the general and common name of sandpapering-machine, it is not my intention to convey the idea that the invention is restricted to the use of sandpaper disks. v

It has been proposed hitherto to make abrading and polishing disks for dental work and for cleaning or dressing shoe-soles" by gluing or cementing two disks of sand-paper or like abrading material to an intermediate disk or body of cloth or other material'whlch' will remain, pliable during the process of manufacture. It is manifest, however, that an abrading-disk comprising two layers of abrading material, such as sand-paper, emerypaper, or the like, an-tntermediate body, and two layers of glue or ement will not possess great or even considerable flexibility. In one instance it has been proposed to perlmtjthe edges of the abrading-disks to project slightly beyond the intervening disk or body, so as to bend over and cover the edge thereof, such construction necessarily involving the use of an intermediate body of considerable thickncss. Such disks are unsuited to the'work for which my machine is designed and cannot be successfully or advantageously'used therein, because the thickness and comparative stiffness of the composite disks preclude the perfect freedom of movement and the ready and certain adaptation and adjustment of 'the' disks to the surfaces to be operated upon, and for the further reason that it is only after continued use and wear that such "composite disks possess even the 'compara.

tively slight degree of flexibility claimed for them if they ever possess it,

To be effective for the purposes of my 1n- -vention the disks must be so thin and light and must possess such-degree of flexibility that the partial vacuum produced by the ex- 'pulsion of air from between the abradingdisks 01 supports shall cause the'abradingdisks to'hug'n'ormally to such backing or supporting disks and to lie flat and smooth thereon, while leaving their outer edges free from folds or'bends and. consequently in the other.

shape best adapted to permitthem to work closely into the angle where the raised portion and the reduced portion of the panel meet. Such action and result are unattainable with composite disks such as heretofore proposed.

Moreover, so far asI am aware,such composite disks have never been combined with an independent backing or support; nor has any one before proposed to employ a; thin flexible disk with a backing or support without securing the one firmly and fixedly to the This combination enables me toattain results never before reached by any macline of this character, so far as I have knowle ge.

Having thus described my invention, what Iclaimis- 1. In a machine for smoothing wood or the like, the combination of a frame, awork-support, a rotatable arbor, and a flexible smooth- 'ing-disk carried by said arbor and free from its outer edge to the centralclamp, by which it is made fast to the arbor.

2. In asand papering-machine, the combination of a suitable frame, an arbor journaled therein and provided with a wheel through which toreceive motion from a suitable source, a flexible abrading-disk made fast at its center to the arbor, but free at its outer edge and arranged to rotate with the arbor,

and a guide opposite the working face of the (1181; to guide the work in passing the .same. 3. In a sand papering-machine, the combination of two flexible abrading-disks, means for rotating said disks, and an, intermediate work-support, each disk being centrally supported, but free at its periphery. 4. In combination with a suitable frame, a work-support mounted thereon and adjust- 40 ablerelatively thereto,an arbor mounted in WWW said frame, and a flexible abrading or smooth-- 6. The herein-described machine for dressing wood-work and the like, consisting pr a frame, an arbor mounted and rotatable therein, two flexible abrading-disks concentrically secured upon said-arbor, but otherwise free, and two supporting-disks also carried by said arbor, one behind each of the abradlngdisks.

7 The combination, with frame A and arborB, of disks E E, supporting-disks F F,

and an intermediate supportingsbridge.

8. In combination with frame A, arbor B, free flexible disks E E, and supporting-disks FF, carried by said arbor, spacing-collar G,' interposed between the disks E E, substan tially as and for the purpose set forth.

9. In combination with frame'A and table L, having slot D, and a work-support or bridgearbor B and disks E E, carried by the arbor and extending through the sloton opposite sides of the bridge.

' In witness whereof I hereunto set my in the presence of two witnesses.

ARTHUR. K. DEVE'NPORT.

Witnesses:

Gno. N. WHITNEY, HENRY E. EDWARDS.

has 4 Corrections in Letters Patent No. 445,749.

Countersigned:

- It is hereby certified that in Letters Patent No. 445,749, gfanted Febmaty- 3, 1891,

upon the applieationtof Arthur K, Devenport, of J aoksen, Michigan, for an improve-* ment in fSandpapering-Maohines, errors appear i n the printed specification requiring' correction, as follows: 113 line 80,,page'l, the word and should read an; in lines 24 and 33, page 3,'to.e words band papering-maehine should read sandpaper'ingmqoltinqand in line 71, same page, a, comma should be substituted for the'hyphen be'atweexi the words bridge and ether; and the said Letters Patent should iioe read with these corrections therein that the same may conform to the record of the case in the fatent Office.

Signed, eountetsigned, and sealed this 10th dty of Febmary. A. D. 1891.

' smm OYRUS BUSSEY,

' 0. E. MITCHELL, v

Uommtmene r of Patsnta.

Assistant Secretary of the Ia tteripr.

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