US1470740A - Polishing wheel - Google Patents

Description

Oct. 16,1923. v

` T. s. HQSE PoLIsHING WHEEL y Filed dan. 23. 1922 Application filed January 23, 1922. Serial No. 531,057.

To alZ whom t may omwem:

Be it known that I, Trrus S. Hose, a citizen of the United States residing at Little Falls, in the county of I'erkimer and State of New York, have invented a new and useful Improvement .in Polishing Wheels, of

' which the following1 is a specification.

the centrifugal force developed by rotating the wheel at high polishing speeds..

Another object of the invention is to provide an improved means for securingy the metallic thimble, which is adapted to fit over the driving spindle of the wheel, in position in the wooden center. 1

Other. objects and advantages of the invention will appear more fully hereinafter.

For the purpose of disclosin the invention'one embodiment thereof has been illustrated in the accompanying drawings, and in said drawings- Fig. 1 is a side elevation of a wheel embodyino the invention, a portion thereof being hewn in section,

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

Fig. 3 is a longitudinal sectional view showing the manner. of inserting the securin nails for the pad segments,

Fig. 4 is a detail section showing the means for securing the pad segments in position, and

Fig. 5 is a perspective view illustrating one of the pad sections.

In the embodiment of the invention illustrated the center or core -1, on which a polishing pad is arranged to be mounted, is formed of a plurality of laminations or veneers 2 preferably formed of wood,thelam1 nations being arranged side b side in a 'cross-grained .relation and .pre erably with "the` grain 'of one laation at right disc form. rEhe wooden laminations inl theirA roulgh form are substantially square and are aid one on top of the other, the grain of each being across the rain of the next adjacent one until a suiiciently thickv block is produced, a layer of glue being interposed between each lamination to secure them together. The s uare laminations thus assembledeach pre erably has a central openin to receive the metal thimble 3. This thimble is provided with a flange 4 through which the securing bolts 5 pass and project into the wooden center. After a certain number of the laminations have been assembled the nuts 6 of the securing bolts 5 are y screwed onto the bolts thereby clamping thel thimble and laminations together, the threaded ends of the bolts being headed over the nuts to prevent any danger of the bolt from turning out of the nut. The remaining laminations are then placed in position.

therebyf entirely concealing the nuts of the bolts and rigidly holding them in position. The entire structure thus formed is then placed under pressure and heldin position until the glue between the laminations has had ainple time toharden. After the glue has hardened and the structure become a practically solid piece, the squared block thus built up is secured upon a suitable thimble or vturning member of a lathe or other device and the circular disc forming the center A core turned out. By assemblin the laminations in their squared form an afterwards turning the wheel, the assemblin laminations in a cross grained relation is insured and a erfectl. smooth periphery on the wheel provided. bly is preferable to cutting the laminatioiis into disk form first, as by this latter arrangement there is danger of not gettin the laminations in proper cross-grained re ation and, furthermore, the glue will tend'to squeeze out around the periphery of the disks thus leaving the periphery of the wooden center rou h.

Agfter the wooden center or core has been trimmed to a circular shape a recess 7 is formed in its outer periphery havingi'h each of its side walls annular, concentric beveled grooves 8, thus forming a double doveof the.

tailed groove to receive the fastening tongue of the polishing pad segments.

The polishing pad, mounted on this .wooden center or core is preferably composed of leather although it may be made of other material, such for instance as paper, canvas, fiber or any polishin material desired, and consists of a series o segments 9 of substantially of the same width as the wooden center. rlhese segments are arranged side by side peripherally on the wooden vcenter and each block is provided on its Under .face with an integral tongue 10 having on its opposite faces a pair of beveled lateral flanges 11 arranged to t in the beveled grooves 8, forming a double dove-tailed tongue and groove connection between the segment and core or center 1. By forming the recess 7 fwith the double dove-tailed grooves 8 as shown, a relatively deep recess is formed, to permit the use of segments with very strong, deep tongues to resist the bursting strains due to high polishing speeds. The grooves 8 nevertheless do not unduly weaken the center disk, as

would a single dove-tailed groove of equalk depth as the intermediate shoulder between the grooves materially reduces the amount of Wood removed and greatly strengthens the connection between the center disk and the segments. In assembling these segments 9 on the core, they are preferably turned endwise to permit the tongue 10 to be inserted in the perpheral recess 7 and afterwards turned crosswise to throw the flanges .11 into the beveled grooves 8. Diagonally extending through each of the segments from one face thereof is a countersunk recess 12 into which is driven, after each segment is placed in position, a securing nail 13 which passes diagonally through the tongue por- -tion of the segment and into the wood center,

-the nail being sufficiently long to cause its has the two laterally extending flanges 11 Yon one side only to permit the tongue 10 being inserted in the groove Without turning` the segment endwise and that portion of the groove not filled by the flanges is lled with glue. An additional holding means for this segment is provided in the form of a plurality of nails 13 driven straight through from the to of the segment and countersunk. It will be noted that the heads of the securing nails 13 are al1 at or below the periphery of the wooden core or center so that the polishing pad may be worn down clear to the wooden core without danger of scratching the to polished. By the arrangement above described the padis supported on its underside at all points on the wheel so that there is no danger of the pad sinking in the center or being bent down at its outer edges. Furthermore, the sections are held in position .without compression so that all portions of the polishing pad are of equal density.

I claim as my invention:

1. In a polishing Wheel, a center disk built up of a plurality of wooden laminations, Ithe grain of the wood of one lamination being at an angle to the grain of the wood of its adjacent lamination, said disk having a peripheral recess therein and having an annular groove in-each of the side walls of said recess, and a polishing pad mounted on the periphery of said disk comprising a pluralit of segments o pollshrng material arrange perip erally side by side bn the disk, each segment having a tongue fitting within said recess and having oppositely disposed flanges engaging in said side wall grooves.

2. In a polishing wheel, a central disk built u of a plurality of wooden laminations, t e gram of the wood of one lamination being at an angle to the grain of the wood of its adjacent lamination, said disk having a peripheral recess therein and having a, plurality of concentric annular grooves and an intermediate shoulder in the side walls of said recess, and a polishing pad mounted on the periphery of said disk and comprising a plurahty of segments of polishing material arranged peripherally side by side, each segment having a tongue litting in said recess and a plurality of laterally extending anges on each side of said tngue intertting m said annular side wall grooves.

3. Inapolishing Wheel,acenter diskformed of a plurali-ty of laminations, the grain of the wood of one lamination being at an anle to the grain of the wood of its adjacent amination, a center metallic thimble extending through said disk having a flange embracing a side ofthe disk, bolts extending through said flange and into said disk, nuts on the ends of said bolts imbedded in the wood of the disk and covered by a portion of the laminations comprising the disk, and a polishing pad secured on the periphery of sa1d disk. y

4. In a polishing wheel, a center wood core having a. peripheral recess therein and a plurality of concentric grooves and an intermediate concentric shoulder in each of the side walls of said recess, and a polishing pad comprising a plurality of segments of polishing material arran side by side around the periphery of said wheel, each segment having a tongue iitting in said 1ecess and a plurality of lateral flanges and an intermediate groove on each side of said tongue arranged to interfit with said concentric grooves and shoulder in the side walls of said recess.

5. In a polishing wheel, a center Wooden core having a metallic thmble extending through the center of said core, a polishing nurpad on the periphery of said core comprising a plurality terial arranged side by side aroundv the periphery of said core, and securln nails for said sections counteisunk below t e surface thereof extendlng into the wooden core of segmentsof polishing ma and having the inner ends clinched on said thimble.

6. In a polishing wheel, a central wooden core having a metallic thimble extendinff through the center thereof, a polishing pad o'n the periphery of said core comprising a plurality of segments of polishing material arranged side by side around the periphery of said core, and securing nails extending diagonally from one side through each of said segments and into the central Wooden core vand having their inner ends clinched on said metallic thimble. V

TITUS S. HOSE.

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