US1568912A - Surfacing tool - Google Patents

Description

- Jan. 5 1926.

G. A. OLIN SURFACNG TOOL Filed April 25, 1924 Nw 8, jv @n .ww mw N mi m. .Q a R m\\\\\\\ VV u ///7w///// rd. f e .N QM. EN, ON WN, NM mh. NNWN NN WN vos Patented Jan. 57, 1926.

UNITED sra'rlszs PATENToFFi GUSTAF A. OIJIN, OF WORCESTER, MASSACHTJ'SETTE.r

SURFACING TOOL.

To all whom z't may concern.'

Be it known thatV I, (Srtnsuar A. OLIN, a citizen of the United States, residing at Worcester, in the 'county of Worcester and Commonwealth of Massachusetts, have invented new and. useful Improvements in Surfacing Tools, of which the following is a specification.

This invention relates to improvements in. surfacing tools, and has particular reference to a novel and improved tool for use in laterally facing off or surfacing abrasive lWheels, or the like.

In my co-pending application Serial Number 708,921 filed April 25, 1924, I have illustrated a machine for use in such work, in which the wheel, disk or the like to be surfaced is given a rotary movement about its axis Awhile the surfacing tool is given` a, movement over the lateral surface of the workpiece in a direction at right angles to the axis of rotation thereof and is also radually kfed in toward the workpiece as t e surfacing operation proceeds.l The tool forming the subject matter of the present invention is particularly `adapted for use with said machine and is illustrated as so fused in the application aforesaid.

In performing vwork of this character, diiliculties have beenexperienced in the past due to the lateral as well as the endwise thrusts imparted to the tool spindle, the changing directionlof saidy thrust impulses, and to the working of abrasive powder resulting fromk the,v work into the spindle-i bearings, causing rapid wear and deterioration oftheparts.

l It is,V the purpose of the present invention to obviate the diiiiculties experienced with the structures of the prior art and to provide an improved surfacing tool which will satisfactorily resist lthe several strains to which it is subjected, ywhich will prevent access of abrasive particles to the working parts thereof, and which will permit `ofi ready lubrication and adjustment of the several parts thereof. f

A .further object of the invention. is to preventbreakage' of reither the tool or the workpiece on account of the usual rigid holding of the parts, which result is accomplished by adapting'the parts of the tool for limited relative yielding movement.

One structure for the attainment of these` )Vbjectsl is illustrated fin the vaccompanying` drawings. Briefly considered it comprises an outer shell or holder and an inner spindle.'

Intermediate the spindle and shell are antifriction bearings tok take upv the lateral strains directed againstthe spindle, and in` addition end thrust bearings are provided to care for the endthrust of the pressure of feeding the device against they work. In the preferred form of the 4device the end kthrust bearings are resiliently supported to yield underfundue. Strain and .thus prevent breaking of either thetool. or work., Means are provided to vary the resilient pressure of the bearings so that said pressure may be reduced as desired according to `the breaking strain ofv the` other parts so that the pressure will at alltimes be less than said amount. f

The spindle is provided with a head portion for engagement withthe surfacing; cup or disk, andadjacent said head has annular members interlocking with corresponding members on the shell to form a labyrinth which Will permit of free rotation of the spindle but will exclude dust or abrasive particles to a maximum degree. Additional means are provided to rotect the bearings from wear, and still ot er means for preventing any possible wear of the main spindle, and the several parts are so assembled that in case of wear the parts which have become worn may be readily removed and replaced. s

Figure 1 is a longitudinal sectionalview of the invention.,

Figure 2 is a fragmentary sectional view of a modified form of spring adjusting mechanism. Y

Figure 3 is a detailed view of the nut locking device employed lin Figure l.

In the drawings, the numeral 10 designates the outer shell of the tool having the exteriorly threaded portion 11 atv one end and the interiorly threaded portion 12 Vat the other. Disposed within the shellis the the roller bearings 19-20 which encircle the '105 enlargements 1415 of the spindle.

The shell 10 has enlargedshouldered recesses 2l-22 which receive'the outer portion of theroller bearings. A washer 23 preferably ojf hardenedmaterial encircles `the en- 11.0

largement 24 of the spindle and bears against the Jforward` end of the bearing 19 to provide a seal therefor and retain it in position. A cap member 25 is screwed onto the portion ll of the shell and has a. shoulder 26 engaging the Washer and locking it and thus the bearing in position.

Forwardly of the portion 24 the spindle has an enlarged head 27, providing a seat 28 for the Work engaging cup or disk 29. This cup 29 is designed to engage the workpiece 30at an angle thereto, as indicated, and to be driven by the trictional engagement thereof with the rotating workpiece, the tool in its travel overthe surface of the workpieceexerting. a combined twisting or grinding and scraping or gouging action onthe Work removing the irregularities therefrom to form a final relatively smooth even surface. @A suitable screw device such as indicated. atl 3l may be employed to secure the cupto the head' of the spindle. lt will also be understood that it desired, in place of depending on the friction drive the spindle may be positively driven, as by application ofA a driving belt to the head 2T or by mounting of a special belt-pulley thereon.

In any event, to prevent access of the abrasive particles removed' during the surfacing operation tothe spindle and its bearings, I preferably secure on the head 27 a collar 32 having an annular rib 33 fitting into the groove 34' in the cap 25, the parts in question thus forming a labyrinth permitting of free relative rotation of the parts Without friction or binding while excluding the dirt and-- dust particles.

At the rear, the spindle has a threaded end135 on which is engaged the nut 36 having a hub portion engaging the inner part of the roller bearing 2O and having an outer portion clamping the washer 37 against the shoulderl of recess 22 to properly retain the outer portion oi. the bearing. The shell has an aperture 38 normally sealed bythe screw 39 which permits access to the periphery of nut 36 for adjustment thereof- When the device is assembled.

Rearwardly oi the nut 36 is a lock nut member jlOVhaving a flange il engaging the nut 36. This liange forms a seat Afor the lineal thrust bearing l2 which encircles the body of the nut. The free face of this bearing is engaged by the spring 43 contained Within the cap 44 which screws into the portion l2 of the shell,l the pressure of the spring against the bea-ring beinO regulated byV screwing or unscreiving of the cap for the purpose heretofore described.

The nut 3G may-be employed as a check or lock-nut to retain the nut in desired position longitudinally of the spindle, and in addition. the nut 40l may be slotted as indicated. in Figure- 3. In this event-,a screw 1;5* serveto-spreadlthe two parts-of thenut at the slot 46 to cause them to bind against the thread on the spindle and resist accidental relative rotation of the parts.

The structure shown in Figure 2 is a slight variation of that just described, in that the nut i7 on the spindle 235 has a hub 48 to engage the inner portion oi' bearing 2O and a slight flange el?) aii'ording a seat for the thrust bearing- 50. The outer edge of this bearing engages the retaining washer 51 for the outer portion of bearing 2U, while bearing is retained in place on nut ai? by a second lock-nut 52. Spring 53 contained within cap 54 encircles nut 52 and exerts its pressure against the bearing 50. This pressure is controlled both by adjustment of the cap :il and by variance in the position of its abutment Washer 55 as shifted by the screw 56 in the cap. A nut 57 serves to loekthe sci-evi7 in desired adjustment.

F rom the foregoing it will'be seen that the spindle is supported for free rotation on antiifriction bearings which will take up both lateral and end thrust strains thereagainst, that the rear bearings are positively sealed against dust and dirt and the front bearing protected to a. maximum degree, that the parts are readily accessible for adjustment or replacement and may be lubricated through the apertures 38 and 59.

I claim.:

l. A surfacing tool of the character described, comprising a shell, antifriction bearings Within the shell, a spindle journaled in said'bearings and having one end projecting from the shell to receive a work engaging member, a shouldered portion on the opposite end ofthe spindle, a. thrust bearing cooperating with said shoulder, a cap Vfor the end of the shell proximate to said bearing, and resilient means intermediate the cap and the bearing for yieldingly 'forcing the bearing against the shouldered portion on the spindle.

2. A device of the character described, comprising a spindle having a head at one end and a threaded portion at the other, annular antitriction bearings surrounding the spindle at spaced points, a sleeve member enclosing the intermediate portion of the spindle and holding the bearings in spaced relation, a shell enclosing the parts having seats for the bearings, a iianged member adjustably mounted on the threaded portion of the spindle, means 'for locking said member in adjusted position, a thrust bearing' engaging said member. a cap adjustably engaging the shell adjacent said bearing, and a compression spring interposed between the cap and bearing, whereb v the pressure of the spring against the bearing is varied b v adjustment oi the cap with respect to the shell.

3. A tool for the purpose described, coinprisingl an outer shell having a bearing. seat near each end and having an exteriorly threaded portion at one end and an interiorly threaded portion at the opposite end7 annular bearings in the seats, a spindle journaled in the bearings and having a head at the exterorly threaded end of the shell and a threaded portion contained within the opposite end of the shell, the head having a bearing-retaining portion, a second bearing engaging member mounted on the threaded portion of the spindle and engaging the bearing to retain the spindle Within the shell, a lock member on the threaded portion of the spindle having an annular flange contacting with the bearing engaging member, athrust bearing mounted on the lock member, a retaining spring therefor, and cap members forming closures for the ends `of the shell interlocking' with the threaded ends thereof, one of said cap ineinbers having a. portion engaging the spring and the other cap member intertting with kthe head of the spindle, whereby said cap .members exclude dirt particles fromy the interior of the shell.

GUSTAF A. OLIN.

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