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Publication numberUS791791 A
Publication typeGrant
Publication dateJun 6, 1905
Filing dateMay 3, 1904
Priority dateMay 3, 1904
Publication numberUS 791791 A, US 791791A, US-A-791791, US791791 A, US791791A
InventorsAlvin Hurford
Original AssigneeAlvin Hurford
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 791791 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)



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N11-791,791. PATBNTED JUNE 6,1905.



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Patented June 6, 1905.




SPECIFICATION forming part of Letters Patent No. 791,791, dated June 6, 1905.

' Appiicaion med May 3,1904. serial No, 200,102.

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Be it known that I, ALVIN HURFORD, a citizen of the United States of' America, residing at Cleveland, in the county of Cuyahoga and State of Ohio, lhave invented certain new and useful Improvements in Grinding-Wheels; and I hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

This invention relates to improvements in grindingwheels,and more particularly to providing a new and improved core or bushing for an emery-wheel which has to sustain considerable pressure against its respective faces either while being adjusted in its operative position or during the grinding operation.

The object of this invention is to provide a device which will serve both as a bushing for mounting an emery-wheel and also as a means for protecting and strengthening the emery- A wheel, so that it will not be crushed orbroken by a strain or pressure acting against the face of the wheel.

My invention therefore consists of certain features of construction and combinations of parts, as will hereinafter be described in the specification, pointed out in the claims, andV illustrated in the drawings.

In the accompanying drawings, Figure lis a view of my improved bushing mounted in an emery-wheel. Fig. 2 is a central vertical section on line 2 2, Fig. l. Fig. 3'is a rear view in perspective of my improved bushing detached from the emery-wheel. Fig. 4 shows a modified form of my device mounted in an emery-wheel. Fig. 5 is a central vertical section on line 5 5, Fig. 4. Fig. 6 is a front view in perspective of a modified form of my bushing detached from the emery-wheel.

Again referring to the drawings, ct represents a grinding-disk, preferably formed from artificial stone, emery, or similar material while in akk plastic condition.

b represents a metallic thimble which forms the bushing proper or bearing for the grind- I lannular seat-forming ange c3 of the same material as the disk. As shown in the drawings, the thimble is octagonal in cross-section; l

but this, of course, is not essential, as it may be any shape desired. One end of the thimble is arranged to abut against the flange 0&3, and on the other end of said thimble is formed an exterior annular liange b. This flange b is arranged in a seat a2, formed in the face of the grinding-disk c, and constitutes a shield which protects the rear face of grinding-disk in the vicinity of the bore. From points equally spaced around the thimble I) arms c extend out radially. These arms are, preferably, four in number, and in the form best adapted for large or thin grinding-disk the arms are made long enough to extend to within a short distance of the periphery of the disk. Thin sector-shaped plates 0l, CZ', d2, and 033 extend between and connect each pair of arms. These arms o and the intervening plates or webs d, d', LZ2, and d3 together constitute a yskeleton o'r frame on which the emery or other naterial is molded in forming the grindingisk.

My modied form, as shown in Figs. 4, 5, and 6, is in all respects similar to the device shown in Figs. 1, 2,and 3, except that the four arms c are made as wide as the thimble and extend out only to the periphery of the flange b', and the webs d, 0l', d2, and da are omitted.

It will be observed that the arms c not only serve to strengthen the grinding-disk, but also provide very efficient means forlocking the bushing in the body of the grinding-disk and preventing the turning of the bushing in the bore or socket of the grinding-disk.

In manufacturing my improved wheel the emery is of course molded on the bushing and frame and the emery is arranged so as to completely inclose the bushing with the exception of the flange which, asIhave said, serves as a shield for protecting the rear face of the grinding-disk around or in the vicinity of the bore ct'.

While my improved emery-wheel can be used wherever it may be advisable to use the face of the emery-wheel for grinding, it is especially adapted for use in sharpening the cutting blades or knivesused in the common form of meat-cutting or sausage machines. My invention may therefore be styled as an improvement on the device shown in Patent No. 616,013, granted to R. V. Jones October 30, 1900. When used for the purpose of sharpening the knives in a sausage machine,

the grinding-Wheel is slidably mounted on a spindle and is caused to advance toward the knives by turning a nut which engages a screw-thread formed on the spindle. The nut comes in contact with the flange b, and the grinding-disk is thereby protected from the crushing strain of the nut and the arms c reinforce the grinding-disk, so that it will not crack or break if accidentally it is pressed too close against the knives While being adjusted.

What I claim isl. In a grinding-Wheel, a grinding-disk having a central bore, a thimble adapted to fit in said bore and provided at one end with an eX- terior annular iiange formed integral with said thimble and arranged to lie close against the back of said disk, and reinforcing-arms formed integral with said thimble and said flange, said arms being arranged entirely Within the material of said dislesubstantiall y as described and for the purpose set forth.

2. In agrinding-Wheel, a grinding-disk provided with a central bore and havingan annular seat-forming fiange formed of the material of the disk arranged at the end of said bore at the working face of said disk, a thimble having one end abutting against said seatforming fiange and provided at its other end with an exterior annular flange arranged to lie against the back of the disk and form a shield around said bore, substantially as described and for the purpose set forth.

3. In a grinding-wheel, a disk provided with a central bore and having an ann ular seat-forining flange formed of the material of said disk arranged at the end of said bore at the working face of said disk, and a seat formed in the material of said disk at the opposite end of said bore, and a thimble arranged in said bore and provided with an exterior annular flange arranged to fit into the seat in said disk, substantially as described and for the purpose set forth.

In testimony whereof I sign the foregoing specification, in the presence of two witnesses, this 8th day of October, 1902, at Cleveland,




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5538464 *Aug 15, 1994Jul 23, 1996Mackay, Jr.; Joseph H.Disposable abrasive wheel having disposable mounting hub including improved metal pressure cap and method of manufacturing the same
US6293349Aug 13, 1999Sep 25, 2001Black & Decker Inc.Edger
US6379234Jun 13, 2000Apr 30, 2002Mackay Joseph H.Reusable mount for abrasive devices
Cooperative ClassificationB24B45/00