US1916543A - Portable sander tool - Google Patents

Description

July 4, 1933. c. D, WELCH PORTABLE SANDER TOOL Filed June 18, 1930 3 Sheets-Sheet 1 gmma Georgefl. [U916]? gm K. W

July 4, D H' 1,916,543

PORTABLE SANDER TOOL Filed June 18, 1930 s Shets-Sheet 2 eorgeD. [U616]? gnwntoz Patented July 4, 1933 UNITED STATES PATENT OFFICE GEORGE D. WELCH, OF HOQUIAM, WASHINGTON PORTABLE SANDER TOOL Application filed June 18,

10 or polishing'flat or curved surfaces generally.

U My general object is to provide a small, light, and easily handled tool, which may be moved about over a surface, even of considerablearea, and so arranged that the workman may engage the inside of the flower run of the fiexible sander belt'with his hand whenever he wishes, to bring the sander belt into contact at the selected' spot with the surface ofthe Work. '1

' It is an object to provide means whereby such a sander may beheld with the belt normally out of contact with'the work, but with means permitting yielding of the belt under pressure of the workmans hand, to permit its deflection into contact with the work.

" It is afurther object to providesuch a tool wherein the sander belt is carried upon rollers from which it may be very simply re movedover one end of the rollers. It is also an object to provide a means whereby the accidental removal of the sander belt from the rollers is prevented.

It is a further object to provide means to exactly align the several rollers, both the 5 belt-carrying rollers, the tightener roller, and

a pressure roller.

Other objects, and especially such as relate to the mechanical details of such a structure, will be ascertainable from a study of the following specification, of the attached drawings, which show my invention in a form at present preferred by me, and of the claims which terminate the specification.

Figure 1 is a plan view of the tool forming my invention, a part of the sander belt being broken away.

Figure 2 is a side elevation of the machine from the forward or outer side, that is the side from which the sander belt is removed.

Figure 3 is an end elevation of my device on a large scale, taken from the right, as seen in Figures 1 and 2.

Figure dis a transverse sect on through my device on the line 4-4 of Figure 2.

Figure 5-is a rear side elevation of one end of my tool.

1930., Serial in. 461,967. V

Figure 6 is ofFigure 5. 7 t

Figure 7 is a detail section on the line'-7-7 ofFi uieQ. ,1 v v Figure8 is a detail persp ctiveTviewfof the mounting for oneof the rollers. j V Essentially, my device comprises an endless sander belt 9' passing aboutrollers l, 2, 3 and 4, which are held ina frar'ne 5 and one ofthese rollers, as the rollei fhi's-mountd to yield, as for iiistance, agai11t aspriiigfito, to permit defle'tion of the loweryi uni of the belt towardsiithe worker to-permit tlie belt to be'slacked off to" sli {it ,off the ends of the several roll'e'rs fonreplacen'ient- I A' pressure roller 6 may likewise be provided, bearing upon the outside of the sander belt 3 immediately above the'driving roller, which may be the ioller,;,1'. To prevent,,,unequa1 wear of the bcltand a tendency ,to climb, as if the rollers were crowned, duefto-imperfect alignment or'parallelism ofthe several rollers, means may be provided at goneend, as will be explained, to align one pair of rollers (for instance the rollers 3 andA) with the other pair of rollers, particularly with the drivingroller 1. I prefer also thatthe entire tool be supported efrom the surface of the work, generally designated at S, upon rollers such as are indicatedat 50 and 51, depending below the frame 5, the frame being governable by any convenient means such as the handle 5:2. The drive maybe variously arranged, and an integral motor may be employed, or a flexible chain drive, or any suitable means. As typical of a means which may be employed, I have shown the'drive shaft 10, on which is mounted the roller 1, journaled in the bearing 15, in the frame, and as projecting therebeyond for connection to a suitable source of power.

Of the rollers 1, 2, 3 and at, the roller 1, being the driving roller, should be journaled in the frame 5, and its companion roller 2 of the same pair is preferably also journalcd in the frame. To the latter end, the frame 5 at each end of the roller 2 may be notched, as indicated at 25, to permit a shaft 20, upon which the roller 2 is journaled in the bearings 21 (see Figure 8), the bottom of the notch 25 being enlarged as indicated at 23, to receive the circular extension 24 of a nut 22. By these or like means, the shaft '20 is re tained, centered in the enlargement 23, yet upon slacking off the nuts 22 (the sander belt a detail section oii'the line 6,6

having first been removed) the roller 2 may easily be slipped from the frame, withdrawing its shaft'QO throughthe slots 25. By such means, it may be held definitely and precisely in parallelism with the axis of the driving roller 1.

The roller 3 is paired with the roller 4, and to permit alignment, or the bringing'of these two rollers into parallelism with the rollers 1 and 2, particularly the roller'l, they are carried ,by anti-frictionbearings 32 and leap-on the respective shafts 31 and 41, which shafts are supported from a longituinally' extending lever 7 This lever is pivoted upon the frame by means of a bolt passingthrou' h ears57 and through the end of th leverfi; "Adjustr'nent o'r7'transverse swingingof tlielever '7 is accomplished by means 'su'chfas the differential screw 71 (see Figure A portion 72 of slight pitch is threaded in the frame 5 and a portion 73 of greaterpitch is threaded in the swinging end of the? 'e'ver"7. Theadjust ment which is fihal lj attained by this screw '71 is held by such means'as the lock nut 7 4. l -Thetwofshafts '31 and flare not each rhceivedfdirectly in the lever 7 Only the shaft 31'is so'held, and the shaft 41,carryiin the tightener roller 4:,is secured in the sw ngingehd of an arm8,'wh1ch is mounted toswing'oii'theshaft 31. The position of the ar fnf'B is' controlled by means of a rod 84 through a lug '58 in the frame 5, and about'fwhich rod the tightener spring 40 is coiled." It "will be noted that the arm 8 is swung 'free, and the shaft 31 is clamped and held in the lever 7 by means of a nut 33, clamping the lever 7 through the intermediary of a spacer collar 38, whereby the nut 33. can force against a shoulder 34 on the shaf't'31. Adjustment of the lever 7 will adjus't the angular position of the two shafts 31 and 41, although the shaft 41, with its tightener roller 4, is still free to swing about the axis of the shaft 31 by means of its mounting on the arm 8, and the influence of the spring 40 thereon.

It will be noted that the frame 5 is dis posed largely at the rear side of the tool, although it has an upper member 5 covering substantially the top run of the sander belt. The several shafts 10, 20, 31 and 41, are all supported from their rear ends, although the shafts l0 and 20 are likewise supported at their forward ends; the shafts 31 and 41 are not. To support the forward ends of the shafts 10 and 20, there is provided a forward extension 55 of the frame 5, which extension is supported from the main frame 5 by means of a web 54, which projects between the upper and lower runs of the sander belt 9, but sufficiently above the lower run to permit insertion of the workmans hand therebetween to en'gage the belt. The frame is omitted therefore below the Web 54;, which is spaced above the lower run of the sander belt.

The wheels 51 are secured directly upon the frame 5 and the exten'siori'55, and the wheel 50 may be mounted in a depending leg 59, and thus supported, the frame may be moved over the surface S until it is brought into position over a spot which is to be sanded, whereupon the workman, placing a hand between the web54 and the'lower run 90 of the sander belt, presses down on the sanderbelt, which causes deflection of thetighterier'roller e ni es tio'n'to .the spring, 40, tojbring ftlie sand'er belt own upon: thework, as has-been indicated in do'ttetl lines in'ri ure'a'. 1

, t. ill b notedih t t roller were are free'at theirlou erprforj ends, and thatthe f mefite sidn tenses njerpr jeet outside of an extension of'th'ejplane of'the sander belt 9,.sqt11atjth reiS iljojobstructio'n to removal of he S nder belt other than'the tension on the spring-:4 hid, in the fillustra e sl-lj'flow v i a fiion. h ve; he u I when. it is des red Jto change sander belts, it

is, easilyfpo'sfs ibl e to swing i'the tightener roller I inward f iioughjto' previde'fs'lack iii theflbelt u h, a wi l p rmeate piwe th wheel 51,a"nd thus to bremo'v'ed' without dismounting any part of the sander. This wheelf 51,"while thesande 'isfin operation, serves as 'a, positive means to prevent the sander belt'slippingjoifthe rollers;

To assist the driving roller 1'," I'prefer that pressure 'rolle'r 6,'previojusly referred to,'be employed, and this is prefe'rably of rubber. It is mounted on one end of alever-GO, pivoted upon ears 5'6, projecting upward from the top portion or table 5 The lever 60 isengaged at its end opposite thatwhi'cli'carries the rollerjii by a spring 62 coiled about alpin 63, having a stop such as a nut 64. The spring 62ejxerts pressure to force the roller 6 down into engagement withthe sander belt 9, running between the pressure roller 6 and the driving roller 1.

It will be noted that the lever 60 is formed in two halves, secured together by the bolts 65, and to replace the roller 6, it is only neces sary to (lismount' the lever 60 and to remove the bolts 65, whereupon the two halves of the lever 60 may be separated, the shaft 66 being releasable from the anti-friction bearings 67,

to permit the insertion of anew roller.

Such a roller is preferably made of or faced with rubber, and unless it is in exact parallelism with the axis of the roller 1, an excessive amount of abrasion will occur and the roller will be quicklyworn out. To exactly align it, therefore, I have provided the bolt 68 received in the ear 69 of the frame, which bolt is threaded in the head 63 of the pin 63, whereby the same may be adjusted transversely of the tool to attain precise alignment of the rollers 6 and 1.

Vhat I claim as my invention is:

1. In combination with a sander belt, longitudinally spaced idling and driving rollers carrying the belt, a frame from which said rollers are supported, two of the idling rollers at one end of the frame comprising a pair, means for aligning the idling pair with the driving roller, at the opposite end, and means for yieldably supporting one roller of the pair to permit its movement towards the driving roller when the sander belt is deflected.

2, In combination with a sander belt, longitudinally spaced idling and driving rollers carrying the belt, a frame from which said rollers are supported, and capable of being moved over the work, a pressure roller bearing upon the belt over the driving roller, and means for aligning said pressure roller with the driving roller.

3. In combination with a sander belt, longitudinally spaced pairs of rollers, including a driving roller, carrying said belt, a frame from which the several rollers are supported, a pressure roller engageable with the sander belt above the driving roller, a lever pivoted upon the frame and carrying the pressure roller, and means for swinging said lever transversely to bring the axis of the pressure roller into parallelism with the driving roller.

4. The combination of claim 3, the lever being split and the two halves removably secured together to retain the roller.

5. The combination of claim 3, the lever swinging means including a vertical headed pin engaging the lever, a spring between the head of said pin and the lever, and a transverse screw threaded in the head of said pin, and swiveled in the frame.

6. In combination with a sander belt, longitudinally spaced pairs of rollers, including a driving roller, carrying said belt, aframe supporting said rollers, wheels depending below the frame to support the belt above the work, tightening means permitting movement of one of said rollers parallel to its axis to allow deflection of the belt into contact with the work, a front supporting member, a horizontal web of said frame extending between the upper and lower runs of said belt to support said front member, said web being out out so as to permit access to the lower run of the belt by the workmans hand.

7 In combination with a sander belt, longitudinally spaced pairs of rollers, including a driving roller, carrying said belt, and a frame extending at the rear side of the roll ers, and including a support at the front side of one pair of rollers only, and substantially within the projected planes of the belt, and connected to the frame in the rear only by an integral web extending between the runs of the'belt, one pair of rollers being supported between the front and rear elements of the frame, and a member pivotally mounted on a vertical axis, and supporting the other pair.

8. In combination with a sander belt, a unitary frame movable over the work, a pair of parallel rollers disposed one above the other, means supporting said rollers upon the frame, means for relatively adjusting said rollers to lie in a common vertical plane, a second pair of rollers and a support therefor carried by said frame, means for relatively adjusting the rollers of said second pair upon their support to lie in a common vertical plane, and independently adjustable means adapted to arrange the roller pairs so that their planes are disposed in parallel spaced relationship, the sander belt being carried by said rollers.

9. In combination with a sander belt, a unitary frame movable over the work, longitudinally spaced rollers supported from said frame and carrying the belt, said rollers being arranged in pairs at each end of the frame, and means to align the rollers at opposite ends, disposed and arranged to align one pair of rollers with the opposite pair.

10. In combination with a. sander belt, longitudinally spaced rollers supporting said belt to form an upper and a lower run, and a frame supporting said rollers, and comprising three integral parts, the first being a plate extending perpendicular to the rollers at one end thereof, the second being a web extending perpendicular to said first part between the runs of the sander belt, the third being a plate supported by said Web and extending parallel to said first plate over the rollers at one end only of the frame, and substantially within the projected planes of the belt.

11. The combination of claim 10 and a plate connected to the frame extending perpendicular to the first-mentioned plate and overlying the upper run of the sander belt.

12. In combination with a sander belt, a

frame, a roller directly supported upon said frame, a lever pivoted upon the frame upon a vertical axis, a transverse roller-carrying shaft secured in said lever, means to adjust said lever to bring the shaft into parallelism with the axis of the frame-supported roller, an arm mounted to swing upon said shaft, a second transverse roller-carrying shaft carried by said arm, the belt being carried upon said rollers, and means for urging said arm and the roller carried thereby against the belt to tighten the belt.

Signed at Hoquiam, Grays Harbor County, I/Vashington, this 10th day of June, 1930.

GEORGE D. WELCH.

Images