US2416493A - Sanding belt machine - Google Patents

Description

Feb. 25, 1947.

Filed Feb. 26, 1945 3 Sheets-Sheet 1 J 6/ 7g 75 I 50 If INVENTOR.

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3 Sheets-Sheet 2 Filed Feb. 26,1945

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SANDING BELT MACHINE Filed Feb. 26, 1945 3 Sheets-Sheet.3

flip/74A ,jAQIM TQ/Y INVENTOR.

Patented Feb. 25, 1947 UNITED STATES PATENT oFncE- f Herman S. Newton, Temple, Tex. Application February 26, 1945, Serial No. 579,739

6 Claims. (01. 51-135) This invention relates to sanding machines and more particularly to sanding machines employed in wood working. 1

The objects of the invention are, first, to pro- 'vide an all purpose sanding machine, in the sense that it is equipped with a double ended workin head capable of vertical and rotative displacement and, by virtue of spindles on eachend of 'the head, a belt may be used for vertical and horizontal sanding or, in place of the belt, abrasive surfaces may be applied to the spindles in-' 'dividually for vertica1 or horizontal sanding. Second, the provision of a sanding head having such flexibility that it may be conveniently and quickly moved to a variety of positions best suited to the type of work being performed, and third; the provision of a convertible sanding head capable of operatingvarious forms of wood-working attachments. r Other objects of the invention include a removable work table for supporting various types of adjustable work fences; a removable platen resisting pressure of work on a'beltsander when employed; a telescoping spring adjustment, combined with a tiltable spindle bearin for maintaming-proper tension'on, the belt sander.

With the foregoing objects as paramount, the invention has further reference to certain features of accomplishment which will become apparent as the, description proceeds, taken .in connection with the accompanying drawings wherein:

Figure 1 is a front perspective view of a, sanding machine constructed according to the invention, showing the sanding belt disposed horizontally.

Figure 2 is a similar view on slightly smaller scale, showing the work table applied and'the sanding belt in vertical position.

Figure 3 is a fragmentary view of the machine cabinet in transverse section, showing the sandend view of the motor pulley section.

Figure 4 is a plan view of the head elevating column casting.

Figure 5 is a plan view of the friction clamping collar for thehead elevating column.

1 Figure 6 is a, side elevational view thereof.

Figure 7 is a front perspective view of the sanding machine showinga brush sander attachment operatively disposed on the idler spindle and an attendant working bridge.

Figure 8 is a plan view of the work table per se, and i Figure 9 is a detail plan view of the work table insert. p 7

Continuing with a more detailed description of the drawing, reference numeral I0 denotes a cabinet which, for reasons to be presently defined, has a superimposed, removable top section I l, shown in Figure 2. The cabinet III has a false top l2 through the center of which extends a cylindrical head elevating column l3, operable ivertically by means of the mechanism shown inv detail in Figure 3.

In Figure 3, the cabinet, I0 is'shown in trans verse, section with the lower portion deleted.

vWithin this cabinet is arranged an elevating lvertically reciprocates. Mounted upon the flange 15 and secured by bolts I1 is aclamp collar 18,

- shown in detail in Figures 5 and 6. This collar is split and the adjacent ends are equipped with ears I9, one of which is tapped and threaded.

Through the aligned apertures in these ears is passed a threaded rod 20 (Fig. 3) which extends towards and through the front wall of the cabinet l0 and carries a crank 2|, by which an operator in front of the cabinet may contract and-expand .its top and lower flange 23 which underlie and support the false top. l2 about the collar l8 where it protrudes through the top l2.

" Spaced upwardly from the bottom of .the mounting I4 is an integral plate 24, upon which rests the lower end of the column l3 when'retracted. In the center of this plate, thereis provided a. boss 25, embracing an opening through which extends a screw rod 26, carrying acme threads 21. A bearing 28 surrounds a thrust bushing 29, the latter, in turn, being mounted or formed on the rod 26. The rod 26 passes through a cross head 30 in the column l3 which is' interiorly threaded to correspond with the threads ofthe rod 26. The-rod 26 carries on on theend of a shaft-33. The shaft 33 is Jourits lowerend a gear 3|, "which meshes with a companion gear 32, mounted naled in an elongated bearing 34 in the mounting l4 and extends through the front wall of the cabinet I and carries a wheel 35. A handle 36 ismounted near .the periphery of the wheel 35 for convenience in rotating the same.

It is apparent from the foregoing that by rotating the wheel 35, the column I3 is raised or lowered through the medium of the screw rod 26 and when the desired elevation and orientation of the headls afiectefd the crank"?!'ris'rotatedito constrict the clamp collar l8 about thecolumn I 3.

Referring now specifically to the sanding head;

it will be observed that tubular members 31 and 38, telescopically related, serve to carry a m t mounting 39 and an idler spindle bearing 411;

respectively. In Figure 3, the motor; designatedj in other figures as 4|, has beenomitted to better disclose the mounting casting 39'." The mounting" is held in secure relation to the hollow'gshaf-t' 91f tubular member 31 by means of a bolt 42 and is so shaped-asto conform to one end of the motor 4|. The opposite end of the "member -31Tis rotat ably held in a split head" 43, "formed .on the upper end of the elevating column fl3'and 'which is' proyided with apertured ears 44 (Fig. 3.) through which a bolt is passed to expand or contract-the split head 43 to loosen or tighten the member when it is; desired tochan'gethe position of the motor-4i and the spindle. v

The spindle ;45, which may be hereinafter .re-- ferred to from time to ,time as the driving spindle, is mounted on the armature shaft 46 61? the motor 4| and is-held thereon by a counter-sunk set screw 41. A sleeve 48 0f .rubber'or other res'ilient material surrounds this spindle and is of slightly vgreater length than the spindle, as indicate'dinFig'ures 3 and 3B. A cap 49 is disposed .over the end of the sleeve 48 and has a boss 50 which is conformably received in the endof the sleeve. ,A novel form of securing means tor the cap 4'llto' prevent its displacement at high speed cbn's'istso'f apair of screws i and 52 having interlocking heads 53 'andfii54 respectively.- It

will be noted"especiallydnFigure 313' that the screw '52 is first screwed into place in-the spindle and afterwards, I the companion screw 51' is screwed into the cap 49 and 'its head' 53 will be received in the correspondingly-shaped recess 55 in the head 54 of the" screw 52 (Fig; 3A) In this manner neither screw will become accidentally loosened to anew the cap 49 'td be displaced at highspeeds. Moreover, it is apparent that by differentially s acing the" cap 4'9 in relation to thef'erid' of thespindl'e 45,-'variati'onsi'n' expan' 'sio'n ofthe resilient material ofjthe sleeve: .48 will I occur to correspondingly alter'the tension on a sanding-belt mounted on the sleeve. l The sanding belt 56, 'whememplo'yed on the machine, as shown in Figuresl and '2, embraces the driving spindle just described "and an idler kspindl'e consisting of ashaft; 51 and a :sleeve' 58,

also composedof: a lies'ilientmaterial'. The" sleeve 58: isrcompressed'ly retained on thetshaft .5111)? a nut 59,- thiiaidedolrfio the End Of the shaft. "51,

as shown in Figure 3". '"The belt. 5.6 :is: not unlike con ntional sanding belts-in constmotion;

The smaller of; the twouteiesoopine tubular members-flame 38' which-carries the spindle bearin '4 is:shap d at itsouter end to define-:a'

sleeve i511 whose axis. transverse tothat of; the

Inember38 and is arcuately cut-awayat .Bl (Fig;

apertures in each side of the sleeve 60 and threaded into aligned openings in opposite sides of the bearing 43. In this manner, the bearing may be tilted in the sleeve 60 and in being so moved, the spindle 58 will be likewise displaced to cause the sanding belt to track on the spindles. A belt 63 (Fig. 7) drives the idler spindle from the driving spindle 45 by virtue of its engagement with the pulley 64 of the driving spindle and pulley 6.5 of-th'e companion spindle. 'TOTCOIICIOI the angular displacement of' the idlerspindle as explained, a hand wheel 56 (Fig. 3) is provided, by which a screw 6'! in the sleeve 63 is set against the lower portion of the bearing so. obviously, sy'aavafiemg the screw 61, the sanding belt may be centered on the spindles while the latter are rotating.

The tubular member 38 has a longitudinally disposed key 68 (Fig. 3) held by screws 69, entering the key through the :companion tubular memhe 3% tohQ h 'r mhe orilza against relative rotation .loutpermittingv longitudinal displacement. A compression spring Mi is disposed h t e e berfil and e s-a a s z ner Blld'Of the member 33, thrusting the latter outwardly to maintain tension pnthe sanding; belt sw li v nthe;. r. r .i sbe t. 63. i

Aep t-qq ar lisimo it sqnit inner end of the tubular member 31 and has ears 12,, aper tured to receive a bpltj|3 (liligs. 3 and 7), by whichthe collar is contracted on the member 31. A boss 1411s formed on the collar TI and is pro vid d with two int r lv th ead peni s. .15., the larger openingbeing adapted to receivethe threaded stem ofa star jwheel IBJFigs. 1 and :2) iorthe purpose of holdinga. platen board ll (Fig. 1) and a platen ca lainposition on thework head,.t he former as a backing for the belt sander 56. The smaller of the openings 15 receives a bolt. tor holding abelt guard, to :be later identified A companion star wheel 19 (Figs. 1, and 2) is mounted in the threaded opening 42 of the motor mountingt33 tocsecure the opposite end of theiplaten and-cap... v

. It is well understoocl from the foregoing that the operating head of the sanding machine is capable of rotation, both ona. vertical axis afforded by the column 13 and on a horizontal axis, byvirtue of the head clamp 43 ofthe elevating column. Thus, the spindles 45 and '58 may be disposed toope-rate horizontally, as shown in'Figure 1 or vertically, as shown in Figures 2; '3 and7, either wither without-thebelt sander 56. When this element is dispensed with an abrasive sleeve ("not shown) may be conformably slipped onto one or .both of the spindles for individual use in' sandring work where suchlimite'd abrasive surface will 'suflice;

murder to properly orientthe spindles, "that is, to dispose them in, true horizontal or vertical planes an arcuate; segment a". (Figs. .3 j and '7) issecured by means oi bo1t'69 to the midsectio'n of tubular member 31 and complementary. to this segment, a boss bis formed on the -head 43 which supports the elevating column I3. 11-, isobvious that when the workhead isrotated in .the supporting head, the ends of the predetermin-ately positioned. segment. of willlen gage thef boss: b at two extreme positions to determine-thehorizontal and verticalpositions of thespindlesl The false 't'opl2. ofthecabinet is provided with an opening at one end, adapted to accommodate the motor 4] whenthelatter is in lowered end, an opening 8| is provided toreceive the bearing of the idlerspindle 58f To provideazsupport for work against the. belt 56 in the position shown in Figure 2,,the top;sec= tion ll, earlier mentioned, issuperimposed upon the cabinetlll and upon this"se'ction, there is provided a flanged top or work table 82; shown an 'lon'gatedopening 83 therein which conforms to t'he spindles 48 and58 and the belt 56 surrounding the same. tachment, suchas awork ffence? 84 (Fig. 2) may be adjustably mounted on the table 82 at desired angles-to the surface of the sanding belt to fa: cilitate sanding.--

It is to be understood that the work table II is not merely an accessory but instead constitutes a part of the machine. It is disposed upon the base portion of the machine and requires no means of securement. The removability'of the work table without complications leaves the working head in the proper working plane without necessity for raising or lowering the same as in some other machines and this feature accentuates the general flexibility of the present machine.

Should it be desired to dispense with the sanding belt 56 and employ only the spindles with abrasive sleeves, an insert 85 (Fig. 9), is placed in the opening 83 of the table, to rest upon the strips 86 in the sides of the opening. A locating strip 81 is disposed transversely on the insert 85 whose ends are receivable in notches 88 of the strips 86 to properly dispose the insert in relation to the spindles 48 and '58 and the ends 89 of the insert are cut to conform to these spindles.

In Figure 1 the sanding head is shown as a horizontal belt sander with the Work table removed. A work fence 90 is adjustably mounted on the head to hold the work operative against the belt.

In Figure '7, thehead is shown as rotated to a position to dispose the spindles vertically and on the idler spindle a brush sander 9| is mounted. This brush sander is of conventional construcin a detail plan view in Figure il. This table has It isapparent that a'n at- I tion and has a hollow core which receives the expandable sleeve of the spindle by which it is held supported upon a base 93 is cut away at 94 to con-' formably receive the brush sander 9|. The base 93 is bolted to the false top l2 of the cabinet at 95. It will be observed also in Figure 7 that a guard 96 is provided for the belt 63 and is secured to the collar II and motor casting 39 by screws 91.

From the foregoing it is apparent that by virtue of the flexibility of the sanding head, a highly versatile machine is afiorded.

Manifestly, the construction as shown and described is capable of some modification and such modification as may be construed to fall within the scope and meaning of the appended claims is also considered to be within the spirit and intent of the invention.

What is claimed is: h

1. A sanding machine including a cabinet having a false top and a removable top section having a work table thereon, a work head supporting column vertically reciprocable in said cabinet, a work head carried by said column comprised of telescopically related tubular members rotatably mounted on said column, means for limiting rotative displacement of said head, work spindles mounted on the outer end of each of said tubular members whose axes are at right angles to that of said members, expansible sleeves carried by said spindles, sanding means on said spindles; a motor-supported byjone of said' tubu-i its ends on saidcolumn, said-work head-dompris ing telescopically related tubular membersrotat ably mounted on said" column transverse to'the axis thereof, a spindle mounted on the outer end of each of said members whose axes are substantially at right angles tothe common axis of said members, and arranged to carry a'sanding belt, spring means wholly within one of said tubular members for axially expanding said tubular members to maintain constant tension on said belt, a motor suspended from one of said members for driving the spindle thereon, means for driving the companion spindle from said first spindle, means for tilting said companion spindle for tracking said sanding belt, means for raising and lowering said column and means for securing said column in adjusted positions.

3. In a sanding machine, a cabinet having a removable work table, a rotatable work head supporting column mounted for vertical movement in relation to said table, a longitudinally adjustable work head rotatably supported intermediate its ends upon and in transverse relation to said column, a spindle on one end of said'head capable of tilting displacement, a second spindle on the opposite end of said head substantially parallel to said first spindle, a belt connecting said spindles, an expansible sleeve carried by each ofsaid spindles, a motor for driving one of said spindles a threaded rod vertically disposed in said column and means for rotating said rod to vertically actuate said column.

4. A sanding machine including a cabinet a vertically movable work head supporting column in said cabinet, telescopically related tubular members constituting a working head rotatably supported intermediate its ends upon and in transverse relation to said supporting column, a V

compression spring in one of said tubular members effecting axial extension. of said working head; a spindle on one end of said head, pivotally mounted for tilting displacement, a second spindle on the opposite end of said head and parallel with said first spindle to support, an abrasive belt between said spindles, maintained in-centered position on said spindles by the tiltability of said first spindle, an expansible sleeveon each of said spindles, a motor for operating said second spindle, means for driving said spindle from the second spindle, means for actuating said column and means for securing the latter in adjusted positions.

5. A sanding machine including a cabinet hav ing a removable work table a work head supporting column movable vertically with respect to said table a longitudinally adjustable head comprised of telescopically related tubular members rotatably disposed on and in transverse relation 'to said column a coil spring enclosed in one of said tubular members for axially extending said head, a spindle at each end of said work head,

anabrasi' ebelt interchangeably mounted on said spind s and h l un rten o o s i -s rin means'for-driving said spindiesra threaded rod in said column and. means .for rotating said. rod to raise and iowersaid heacb j V I :6. A machine as described in claim 5, further defined in that one of thespindles is'mounte'd in a bearing embraced byasleeve secured to one end of said head at right angles to its longitudinal axis; wherein said bearing is suspended. on diametrically. opposed pivots for tilting displacement to-efiecttrac iring of a belt traveling thereon and 7 means for adjusting the degree of displacement sQ' N T N. 1 I 15 13,061 28 8; mmmcsste n The following references are of record in the file of this patent:

I UNITED STATES PATENTS v I Q Date I Australian May 1, 1928

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