US 816461 A
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Description (OCR text may contain errors)
P ATENTED MAR. 27, 1906 No. 816,461V
G. GORTON. ULEARANGE SPA GB @BINDING DISK.v
APPLICATION I'LED 13116.22. 1904.
,zus-Ixix Unirnn s'rArns PATENT orrion. 1
Groen eoRToN, or RACINE, wisconsin;
Specification of Letters Patent.
Patented March 27,1906.
Applioatien filed December 22, 1904. Serial No. 237.971.
To all whom it may con/cern:
Be it known that I, GEORGE GoRToN, a
` citizen of the United States, residing at Racine, Racine county, Wisconsin, have invented certain new and useful Improvements in Clearance-S ace Grinding-Disks; and I do hereby dec are the following tobe a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. p l
This invention relates to certain improvements in abrading-sheets, and more particuamong others within the spirit or scope of my invention, Figure l is a plan view of a `grinding-disk or abrading-sheet constructed 1n laccordance with my invention. Fig. 2 is a cross-sectional view, on an enlarged scale. Fig. 3 is a section on anexaggerated scale, showing a different formation of abradingsurface.
In the drawings, 2 is a sheet of pa er, fabric, or other suitable, usually iiexib e, material. One face of this sheet is usually lain or not 'covered with abrading material,w ereby said plain face of the sheet can be glued or otherwise secured to the rotary head or disk Vof a grinding or other machine, althou h said abrading-sheets can be secured on cy inders or bufllng-wheels or can be employed in the form of endless traveling bands `or otherwise,
as may be desired. The opposite face of the sheet is provided with the abrading-face, which is .formed thereon by applying li uid "glue or other adhesive to the sheet and t en sprinkling or otherwise depositing the desired .quantity of grit on the deposit of glue,
' so that the grit is, in effect', taken up by the adhesive, which on` hardening forms a binderfor the Grit and secures the abradin -surface to the sheet. Any suitable gradeo grit can be used in any desired quantity to form the abrading-surface the desired thickness. The abrading-surface of each disk or sheet is usually of approximately the same thickness throughout-that is, the working face of the abrading-surface of the rinding-disk is preferably iiat and in one p ane. material or surface 3 of the disk practically forms one or a single sheet or surface. In other words, it is not broken up into separate ortions or areas, but clearance is provided or by a great plurality of isolated suitablydistributed small blank or uncovered or nony working4 spots or recesses 4, which can be formed in the abrading-surface by any4 suitable means or by a suitable step or steps in the process of manufacturing the grinding-disks. The single or continuous-abrading-surface isinactive, so far as grinding or working is 1 concerned, at the several clearance-spots 4,
whether said spots be entirely blank, of grit, or whether the floors of said s ots are lentirely below the working face o the abrading-surface. In other words, working abrading-mate'rial faces are lacking at these iso-V lated spots, and hence said spots provide for" clearance as the refuse and grit worn from the work being ground and from the abradingsurface ind ready escape into said spots.
Each clearance-spot can be of any suitable shape or form, although I prefer spots of the general outline shown and that all the spots of a sheet be similar in form and dimensions, although I do not wish to so limit my invention. The clearance-spots can be arranged or distributed in any suitable manner, and I do not wish to limit myself to a uniform or even distribution thereof in the single continuous abrading-material surface, which is unbroken except for s aid spots, as said surface is not by said spots divided into areas or working portions. I usually arrange the spots equally spaced apart and distributed throughout the single sheet or layer of abrading material, and hence I usually lay out .the spots in parallel equally-spaced. rows intersected at right'angle's by parallel equallyspaced rows. I
When the grinding-disks are in the form of circular sheets with a central perforation, asy shown, Iusually form the annular abradingsurface with annular outer and inner narrow portions lor margins 5, which are not formed withtheclearance-spots. This peculiar formation with the narrowl annular non-clearance inner and outer edge portions adds to the The abrading IOO IIO
durability of the edge portions or margins of the abrading-suriace; but I do not Wish to limit 4other features of my invention thereto.
I show in an exaggerated manner in Fig. 3 a sheet 6, which can be formed of cloth or fabric having the continuous Working abrading-material sheet or surface 3, With clearance spots or non-Working blanks 7, Jforming recesses into which the refuse can escape, thereby providing for clearance. The sheet 6 has thin non-Working layers of grit forming the depressed i'loors of these spots, so that the spots 7 are,I in effect, formed by small concavities or refuse-receiving recesses.
I have found b experience that materially-increased e ciency and durability in clearance-space abrading-s-urfaces is attained by employing practically a Single or continuous sheet or one layer of abrading material, as distinguished from se arated or distinct sheets, layers, or areas o abrading material or Working faces and by forming isolated clearance-spots or non-Working blanks in this practically continuous layer or sheet of abrading material. The spots provide for such free and rapid clearance as may be necessary, and et the abrading-surface is not materiall Weahened` or reduced by the spots, as the a rading surface is bound together throughout into one sheet or layer an comprises a maximum quantit of abrading-grit.
abrading-surface l find that my improve possesses quallties of great endurance and also attains a very high eiiiciency, thereby effecting increased econorn" in the use of clearance-space grinding-dis s.
' lDivided and blank clearance-space abrading-surfaces are, broadly, very old in various.
arts and, broadly considered havbeen Well known to those skilled in the art for many years; but it is the object of my invention to produce a grinding-disk of higheiciency and durability and capable of -being produced at a low cost, whereby clearance-space grindingdisks can be generally used in practice on an economical basis.
It is evident that various modifications might be resortedtowitlout .departin from the spirit and scope of my invention. l ence I do not Wish to limit myself to the exact con- Havingthus described my invention, What l I claim 1sand consisting of a layer of adhesive-andgrit formed With a multiplicity of isolated none.
working clearance-spots distributed through out said surface, each surrounded by said abrading-surface, whereby all portions of said layer are bound or connected together, substantially as described.
2. A grinding-sheet consistin of a flexible sheet having a layer 3 of abra ing material secured Ona face thereof and formed with a multiplicity of isolated blank clearance-spots 4, distributed throughout said layer between the margins thereof, substantially as de. y
In testimony whereof I aiiix my in presence of tWo Witnesses.
CHRISTOPHER C. GITTINGS,
MATTIE E. PALMER'.