US2675654A

US2675654A - Honing stone and method of

Info

Publication number: US2675654A
Authority: US
Publication date: 1954-04-20
Anticipated expiration: 1971-04-20

Description

April 20, 1954 w. H. HARRIS, JR

HONING STONE AND METHOD OF MANUFACTURE 2 Sheets-Sheet 1 Filed Feb. 13, 1950 I INVENTOR. #41124? Harris, J:

April 20, 1954 w. H. HARRIS, JR 2,675,654

HONING STONE AND METHOD OF MANUFACTURE Filed Feb. 13, 1950 2 Sheets-Sheet 2 INVENTOR. Mk??? /'9, #4/7 25, 7;.

BY I

M 24 Mix Patented Apr. 20, 1954 HONING STONE AND METHOD OF MANUFACTURE William H. Harris, Jr., Detroit, Mich., assignor to Micromatic Hone Corporation,

Detroit,

Mich., a corporation of Michigan Application February 13, 1950, Serial No. 144,008

11 Claims. (Cl. 51-204) This invention relates generally to honing tools and more particularly to a honing element and a method of manufacturing the same.

It is an object of this invention to provide a honing element in which the honing stone or abrasive element is mounted and supported in a nonabrasive backing member, so that as the stone wears the encasing portion of the backing member will likewise wear, whereby the stone may be used until it is completely worn away, rather than replaced when only partially worn, such as is the case when metal backing members, or the like, are used to support the stone.

It is a still further object of this invention to provide a honing element of the aforementioned type, which may be easily and positively positioned in a grinding tool, and which is relatively inexpensive to manufacture and econimical to use.

It is a still further object of this invention to provide a honing element of the aforementioned type, which is rugged in construction and durable in use, and in which the nonabrasive backing member is reinforced so as to reduce any danger of breakage or deformation of the element.

It is a still further object of this invention to provide a novel method of manufacturing a honing element of the aforementioned type, which method is extremely simple and inexpensive.

It is a still further object of this invention to provide a honing element of the aforementioned type, in which the backing member is made of a moldable material, such as plastic, so that the entire element can be molded together in one simple operation.

It is a still further object of this invention to provide a method of manufacturing honing elements, which permits a pair of honing elements to be simultaneously formed in a single mold and then severed or separated to produce a pair of either like or dissimilar honing elements.

These and other objects of this invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, in which:

Figure 1 is a side elevational view, partially broken away in. section, of a portion of a grinding tool having the honing elements of this invention connected therewith;

Fig. 2 is a sectional view of the structure illustrated in Fig. 1, taken along the line 22 thereof;

Fig. 3 is a perspective view of a honing element of this invention;

Fig. -4 is an exploded perspective view of a. pair of honing stones and a honing element reinforcing member prior to the assembly of these elements into a finished molded honing element;

Fig. 5 is a side elevational View of a portion of a mold having a pair of honing stones and a reinforcing member positioned therein;

Fig. 6 is a sectional view of the structure illustrated in Fig. 5, taken along the line 66 thereof;

Fig. '7 is a sectional View similar to Fig. 6, with the moldable material in the mold;

Fig. 8 is a perspective view of the article formed. in the mold of Figs. 5 through 7, prior to the separation of the article into two honing elements; and

Fig. 9 is a view similar to Fig. 5, illustrating a further embodiment of the honing element of this invention, being formed in a mold.

Referring now to the drawings and more particularly to Fig. 3, a honing element H is illustrated, which includes a honing stone or abrasive element l3 and a non'abrasive backing member IS. The honing stone l3 has all but its working face I! encased by the backing member l5, and the opposite sides of the backing member l5 have integral rectangularly shaped tabs or projections l9 formed thereon. In the particular embodiment illustrated, two such projections I!) are provided on each side of the backing member 15, and the projections extend rearwardly from the stone working face I! to the back face of the backing member l5. Three longitudinally spaced grooves 2! are formed in each side face or wall of the backing member i 5, and these grooves extend rearwardly from the working face of the honing stone I 3- to the back face of the backing member I5, for reasons which will hereinafter appear.

The top and bottom end walls of the backing member l5, rearwardly of the back face of the honing stone !3, are notched at 22, for reasons which will hereinafter appear. Imbedded in the backing member l5 are a pair of reinforcing

members

23 and 25. The reinforcing member 23 is of an oppositely zigzagged shape, or has expanded or laterally offset portions 21, so that it is of substantially the same width as the honing stone IS. The reinforcing member 23 extends substantially the full length of the honing stone 1? and the front edge thereof engages the back face of the honing stone l3, while the back edge thereof terminates at the back face of the backing member I5. The reinforcing member 25 is in the form of a flat plate and has one side face thereof engaging one side of the rein forcingmember 23. Member 25 is shorter than member 23, so that it abuts only an intermediate portion of member 23.

Two honing elements, such as illustrated in Fig. 3, are simultaneously formed in a mold 29, such as illustrated in Figs. through '7. The mold 29 is shown as being formed of two halves 3| and 33, which, when assembled, form a mold cavity 35. In forming the finished honing element, two honing stones l3 are placed in the mold cavity 35 and are spaced apart by the reinforcing

elements

23 and 25, which, when inserted in the mold cavity, retain the opposed working faces of the honing stone in engagement with the end walls of the mold cavity. The opposite side walls of the cavity 35 are formed with three longitudinally spaced, laterally extending ribs 31, which engage the opposite side faces of the honing stones so as to maintain them in a spaced relation with respect to the side walls of the cavity. The side walls of the mold cavity 35 are also recessed at 39, at longitudinally spaced points, for reasons which will hereinafter appear. The cavity mold is then filled with moldable material, such as phenyl and vinyl resins and the like, which is of a nonabrasive character. A suitable molding operation is then performed so that the plastic or nonabrasive material forms a backing member encasing the reinforcing members and all but the working faces of the honing stones It. The molded article is then removed from the mold, and is in the form illustrated in Fig. 8. By cutting the article illustrated in Fig. 8 along substantially the longitudinal center line i i, two

honing elements, of the type illustrated in Fig. 3, are provided. The notches 22 are ground or cut in the top and bottom edges of the honing elements, either before or after the severing operation, so as to provide the finished elements.

The two honing elements formed from the one molded article illustrated in Figs. 5 through 8 are exactly similar. However, it is possible, with the method and construction of this invention, to form dissimilar honing elements such as illustrated in Fig. 9, wherein one honing stone I3 is of the same length as that previously illustrated, while the other honing stone I3" is of a shorter length. With this arrangement, the honing stone i3 is positioned with respect to the reinforcing member 23, by lancing tabs 43 from one side edge of the reinforcing member 23, which tabs will retain the honing stone [3 in the proper relation to the reinforcing member during the molding operation. When the mold cavity is filled with moldable material, the space above and below stone [3 will be filled with the material, which will wear at the same rate as the stone and will not interfere with the honing operation. The remainder of the method of forming the honing elements is the same as previously described, and when the molded article is longitudinally separated or out two dissimilar honing elements are provided, one with a long stone and the other with a short stone.

In order to use the elements H in a honing operation, they are mounted in a suitable grinding or honing tool M. The tool illustrated in the drawing comprises three longitudinally spaced spiders 45 which are recessed at 41, at circumferentially spaced points to receive a plurality of the honing elements I Cam shoes 49 are disposed in the slots l! inwardly of the honing elements H and the cam shoes are engageable in a conventional manner by cam elements 5| so that the honing elements can be moved radially inwardly or outwardly relative to the spiders. Garter springs 53 extend around the tool, at the upper and lower ends of the honing elements, and. are positioned in the honing element notches 23 so as to resiliently hold the honing elements in position in the spiders. The projections or tabs I9 of the honing elements fit into recesses in the spiders 45 so as to prevent relative axial movement: between the honing elements and the spiders. A plurality of wiper elements 55, which may be made of wood, plastic, or some other suitable nonabrasive material, are mounted in recesses in the spiders, at circumferentially spaced points, for the usual purpose.

It will thus be seen that the nonabrasive backing member I5 of each honing element can wear with the honing stone I3 and the honing elements need not be replaced until the entire honing stone is completely worn. Thus, the full benefit of the honing stone is achieved, and the honing element need not be repaired or replaced before the stone is completely worn, such as. is generally the case with most honing element construction, where a nonabrasive backing member is not employed.

Furthermore, it will be appreciated that the projections or tabs on the honing element provide a simple means of positioning or anchoring the honing element in the honing tool, while the grooves or notches 22 provide a simple means for engagement with the garter springs which resiliently retain the honing elements in their proper position. Still further, the ribs 31 of the molds, which form the grooves 2! in the backing members, positively position the honing elements or stones in the mold and insure uniform molding of the material about the honing stone and reinforcing member. Also, as the greatest forces exerted on the honing element, during a honing operation, are in a radially inward direction, the zigzag construction of the reinforcing member 23 gives the necessary added strength and rigidity to the backing member l5 to prevent the same from materially deflecting, breaking or becoming damaged. Also, the reinforcing plate 25 aids in preventing deflection or bending of the entire honing element in the opposite plane. Thus, a durable, rigid, inexpensive honing element is provided, which is formed in one simple molding operation, and which is extremely inexpensive to manufacture and use.

What is claimed is:

1. A honing element for a grinding tool, including a honing stone unit, a backing and supporting member of molded plastic materialencasing said stone on all but its Working face, and a reinforcing member imbedded in said molded material and having one edge abutting against the adjacent face of said stone.

2. A honing element for a grinding tool, including a honing stone, a nonabrasive backing and supporting member encasing all but one face of said stone an edgewise disposed reinforcing member of sheet metal imbedded in said backing member behind said stone and extending in one direction from the back encased face of said stone to the back face of said backing member and substantially the entire length of said stone.

3. A honing element for a grinding tool, including a honing stone, a plastic backing and supporting member encasing all portions except the working face of said stone, a reinforcing member imbedded in said backing member behindsaid stone, said reinforcing member having portions laterally expanded or offset so that said reinforcing member extends substantially the width of said stone.

4. A honing element for a grinding tool, including a honing stone, a plastic backing and supporting member encasing all portions except the working face of said stone, an oppositely zigzagged reinforcing sheet metal element imbedded in said backing member behind said stone and extending substantially the width and length of said stone, one edge of said reinforcing element substantially engaging the back face of said stone, a second plate-like reinforcing element imbedded in said backing member behind said stone and adjacent to said first reinforcing element.

5. The method of making a honing element for a grinding tool, including the steps of positioning a reinforcing member between a pair of honing stones, of encasing said reinforcing member and all but the opposed faces of said honing stones with a plastic material, and of longitudinally cutting the article so formed so as to provide two honing elements.

6. The method of forming a honing element for a grinding tool, including the steps of positioning a pair of honing stones in a mold, positioning reinforcing means between said stones, of molding a, material around and in engagement with said reinforcing member and stones so as to encase said reinforcing means and all but one face of each of said stones, of removing the articles so formed from the mold, and of longitudinally severing the article so as to form two honing elements.

7. The method of forming a honing element for a grinding tool, including the steps of positioning a pair of honing stones in the cavity of a mold, of separating the stones by positioning lation to the wall of said mold cavity, of molding material around said stones and reinforcing member so as to encase said reinforcing means and all but one face of each of said stones and produce a molded article, of removing said article from said mold, and of severing said article along its substantially longitudinal center line so as to provide two like honing elements.

8. An article of manufacture, including a pair of laterally spaced, longitudinally extending abrasive elements, one of which is of a substantially greater length than the other, a reinforcing member disposed between said abrasive elements for spacing the elements, means on one edge of said reinforcing member engaging the opposite end faces of the shorter of said abrasive elements for positioning the same with respect thereto, and a plastic backing and supporting member encasing all portions except the faces opposite to the adjacent faces of said abrasive elements and filling the space therebetween.

9. A method of simultaneously forming a pair of dissimilar honing elements for a grinding tool, including the steps of separating a pair of honing stones of different lengths with a reinforcing element of substantially the length of the longer abrasive element, of positioning the shorter stone relative to the longer stone by said reinforcing member, of encasing all but the faces opposite to the adjacent faces of each of said stones with a plastic material, and of severing the article so formed along its substantially longitudinal center line so as to provide two dissimilar honing elements.

10. A honing element for a grinding tool, including an abrasive element, a nonabrasive backing and supporting member of a substantially greater length than said abrasive element and encasing all portions except the one face of said abrasive element, a reinforcing member imbedded in said backing member behind said abrasive element and being of a substantially greater length than said abrasive element, and means on said reinforcing member engaging the ends of said abrasive element so as to retain the same in a predetermined position with respect to said reinforcing member.

11. A honing element for a grinding tool, including a honing stone of substantial length relative to its width and thickness, a unit backing and supporting case of molded plastic material encompassing said stone on all but its working face and being bonded thereto, said case at the ends and two opposite sides being comparatively thin so as to wear away as the abrasive material on the working face breaks down during the honing operation, the material on the side opposite to the working face being substantially thicker as compared with the thin material at the side and end walls, and a pair of rectangular-shaped tabs projecting from said opposite Side walls, said tabs being spaced from each other and the ends of the element and aligned on opposite sides thereof.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 772,247 Muller Oct. 11, 1904 832,074 Miller Oct. 2, 1906 893,198 Schachner July 14, 1908 1,251,019 Harter Dec. 25, 1917 1,708,059 Griiiiths Apr. 9, 1929 1,750,511 Dunn Mar. 11, 1930 1,962,947 Ballash June 12, 1934 1,973,117 Sklar Sept. 11, 1934 2,073,590 Sanford Mar. 9, 1937 2,106,205 Connor Jan. 25, 1938 2,263,781 Kline Nov. 25, 1941 2,265,377 Kline Dec. 9, 1941 2,281,420 Drader Apr. 28, 1942 2,304,984 Wood Dec. 15, 1942 2,349,977 Mazzoni May 30, 1944 2,369,291 Frank Feb. 13, 1945 2,509,652 Rushmer May 30, 1950 2,537,684 Manuel Jan. 9, 1951