US1470957A - Rotary grinding or polishing tool - Google Patents

Description

1,470,957 E, cAvlczcl-n 4komm! alumnus on PoLrsHmo Toon Filed April 12. 1920 v Ihvenor. Y Ercole Cavcchi Patented ('ct. 16, 1923.

UNITED STATES TN? FFCE.

ROTARY GRlVNDINGj 0? POLISHING T0011.

Application filed April 12, 1920. Serial No. 373,097.

To all whom it may cm1-cern.'

Be it known that l, ERCOLE CAvIooHr, a citizen of the United States, and resident of Quincy, county of Norfolk, State of Massachusetts, have invented an Improvement in Rotary Grinding or Polishing Tools, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates toimprovements in tools for grinding land polishing machines and the principal object thereof is to provide supporting means for abr-riding members which Will enable the abrading members to he readily assembled or replaced when worn.

A further object ci the invention is to provide a grinding tool comprising a rotatable supporting disk for abrading members having means by which fluid may be supplied to the working faces of the abrading members. Y i

A further object 02 the invention is to prnvide a rotatable lool for and polishing machines with a fluid receptacle and with means for delivering the fluid from said receptacle directly to the grinding faces.

A furthe-r object of the invention is to produce a grinding tool having ahrading members s0 constructed and positioned as to cause the grirnlingv material and Huid used in the process of grinding to flow toward thefcenter of the tool in opposition to the centrifugal force imposed nponA the grinding materialby the rotation of said grinding tool,

Other objects and features of the invention will, more `fully appear from ,the follow ing description and the accompanying drawings and will be. pointed ont in the annexed claims.

A. preferred embodiment of the invention, which is-illustrated herein, is particu-y larly adapted for use in machines of the type disclosed in my prior Patent No. 1,126,615, granted January 26, 1915, in which a truck supports anV electric meto-r which drives, through suitable gears, a vertical shaft which iS Connected to and rotates the gfmng tool.

11i-the drawings:

Fig. 1 is a bel-tom plan rien of a grinding tool embodying my inaentienlshowing the support for the abrading members, certain o-.E the ahrading vrnetnloinsabeing secured to said support and others omitted for the purpose of clearness of illustration.

Fig. 2 is a side elevation of Vthe grinding tool, and,

Fig. 3 is a perspective view of the preferred form of abrading member or block.

The abrading tool, which is illustrated in the accompanying drawing, comprises a support for the abrading members, preferably in the form of a disk l having a central openingr 2 and upon opposite sides of Said central opening upwardly projecting lugs or bosses 3, 4 provided with alined apertures 5, 6 to receive a pin for securim;- said disk to the rotatable driving shaft of a grinding or polishing machine of the type disclosed in my prior patent aforesaid.

The disk 1 desirably is provided with an annular flange 7 located adjacent its periphery and extending upvvardl;y from the upper face of said disk to form a fluid receptacle from which fluid, such as Water, may be` supplied to the abrading members through suitable apertures 8 extending through the disk.

The under face of the disl-f` l is provided with a. series ci downwardly extending holders 9 which be in the form of plates secured to the disk, or may be projections formed integral with the disk itself. The holders 9 desir-ably are provided with in Wardly converging' walls l0, ll. having re spectively under-cut faces lil, 13 adapted to engage flanges lll, l5 projecting from the sides 16, l? respectively of an abrading block 18 which is so constructed as to fit the sockets formed b v the converging sides of adjacent holders.

in the preferred embodiment of the invention illustrated in the accompanying' drawings the under-cut Walls l0, 1l. of the holders 9 incline in a direction rearwardly in respect to planes extending from the axis of the disk to the outer ends of said sides,l the inclination of the rear side preferably being less than that of the forward side, whereby the front faces of the abrading members are caused to incline rearwardly to radial planes and serve to force the grinding material toward the center of the disk in opposition to the normal centrifugal action of the rotating tool which otherwise would tend to throw the grinding material out from beneath the grinding tool and the inclination of the rear faces of the tillV abrading members and their supports serve to counteract the forces which tend to displace the grinding tools when in use.

It will, however, be understood that di'i'iferent arrangements and forms of grinding tools may be made and that the walls of the holders may converge outwardly ir.- stead of inwardly within the scope of my invention.

The abrading tool 18 desirably is in the form of a somewhat distorted segment of a circle, and each tool preferably is rovided with a vertical aperture 19 prefera ly having walls substantially parallel respectively to the straight and curved walls of the block extending through the tool from the upper face to the lower or active grinding face and adapted to register at its upper end with one of the apertures 8 through the disk 1.

In order to assemble the abrading members 18 upon the disk it is merely necessary to place the upper aceof the abrading members against the face of the socket between the walls 10, 11 of adjacent holders, and then to Slide the abrading member inwardly until the lflanges 14, 15 engage the under-cut walls 12, 13 of the holder 9.

In order to secure the abrading members when thus assembled against the outward movement, which is caused by the centrifugal force of the rotating tool, the periphery of the disk desirably may be and is provided with a series of downwardly extending bosses 20, preferably located midway of the distance of the outer end of adjacent holders and therefore, op osite the central portions of the sockets or the abrading tools which lie between the adjacent holders. The abrading members may then, when seated in place by longitudinal movement relatively to the walls of the holders, be locked in position by wedges 21 driven between the outer walls 2201:' said abrading members and the bosses 20.

In order to replace a worn abrading member, therefore, it is merely necessary to drive out the wedge which holds it in place and slide the abrading member longitudinally outwardly sufficiently to disengage the flanges 14, 15 from the under-cut walls 10,

11, whereupon the abrading member may be` lifted directly from the disk and a fresh one replaced in the manner above described.

In the use of the grinding tool, water or other fluid may be supplied to the receptacle within the flange 7 from whence it will run by gravity through the apertures 8 in the disk and the apertures 19 in the abrading members to the surface being ground, thereby insuring the proper moistening of the grinding material or grit which intervenes-between the under face of the abradin member and the surface being ground:

Y or if no such abrading material is used, will serve to keep the face of the abrading member sufficiently moist to enable it to operate efficiently.

By reason of the fact that the forward `faces of the abrading members incline rearwardly from radial planes extending from the center of the disk t0 their outer ends the water and grit, which is present between the grinding tool and the surface being ground, will always be forced toward the center of the grinding tool-in opposition Vto the centrifugal action of the tool and the proper action of the grinding tool upon the surface being ground will thereby be maintained.

It will be understood that the embodiment of the invention disclosed herein is of an illustrative character and is not restrictive and that various modifications in form, construction and arrangement of parts may be made Within the spirit and scope of the'following` claims, and that the abrading or polishing members may be constructed of any material suitable for the use to which the invention is to be applied.

Having thus described Vmy invention, what I claim as new and desire to secure by Letters Patent, is:

l. A grinding tool comprisingla rotatable supporting disk having a series `of holders projecting from the under-face thereof and provided with inwardly convergingY undercut walls forming sockets for abrading members, abrading members of substan-l tially segmental form inclined rearwardly in respect to radial planes extending from the axis of the disk to the outer ends of said walls having flanges conforming substantially to said under-cut walls, adapted to be secured in said sockets by inward longitudinal movement `relatively to thewalls of said holders, apertures in said 'abrading members having walls substantially parallel respectively with the straightand curved walls of said segmental abrading members, communicating apertures in said disk and means for locking said abrading members against longitudinal movement when seated in said sockets. Y

2. A grinding tool comprising a rotatable supportingr disk having a series of holders projecting from the under-face thereof,'pro vided .with inwardly converging under-cut walls forming sockets for abrading members, bosses upon the periphe of said disk opposite said sockets, abrading members having` anges corresponding substantially to said under-cutwalls' and adapted to be seated in said sockets by longitudinal movement of said abrading` members relatively to said walls and wedges intermediate of said abrading members and said bossesl for lock-Vr grinding tools comprising a block having a1 circular outer wall and converging straight side walls, the forward side Wall being inclined rearwardly with respect to a plane radial to the outer wall passing through the outer end of said forward side wall, the upper portions of said walls being provided with outwardly projecting flanges said abrading member being provided with an aperture extending from the upper face to the lower face and having walls substanl0 t-ially parallel respectively to the converging side walls and the circular outer wall.

In testimony whereof, I have signed my name to this specification.

ERCOLE CAVICCHI.

Certificate of Correction.

It is hereb)v certified that in Letters Patent No. 1,470,957, rented October 16, 1923, upon the application of Ercole Cnvicchi, 0f Quincy, Mtssachusetts, for an improvement in Rot-ary (lrrinding or Polishing Tools, errors appear in the printed specification requiring;r rorrection :is follows: Page 2, claim 1, line 100, commencing with the wol-(l inclined7 strike ont all to and including,r the word Walls line 103; same page und claim, line 99, after the. word members insert the Words inclined rmsrumrfl/r/ in respect to 'radial planes offending rom ffm amis of the disk to the www @mls of wid walls, and that the said Letters atent should be read with these corrections therein that the Same may conform to the record of the case in the Patent Office.

Signed and sealed this 27th day of November, A. D., 1923.

[SEAL] KARL FENNING,

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