US2283320A

US2283320A - Diamond-holding tool

Info

Publication number: US2283320A
Application number: US391235A
Authority: US
Inventors: Dinhofer Julius
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-05-01
Filing date: 1941-05-01
Publication date: 1942-05-19
Anticipated expiration: 1959-05-19

Description

y 4.LnuuHoFER V DIAMOND-HOLDING rTOOL May 19; 1942.

Ffiied May 41, 1941 4 INVENTOR `oRNlaY k Patented May 19, 1942 Umso STATES PATENT" orties DIAMOND-HOLDING TOOL Julius Dinhofer, New York, N. Y.

Application May 1, 1941, Serial No. 391,235

(CI. 12S-39) 4 Claims.

This invention relates to means for holding diamonds of the character employed as grinding-wheel dressing tools and for other purposes.

At the present time, diamonds used for grinding or dressing purposes are usually of irregular shape and are held in a holder in such a manner that a selected pointed portion of the stone protrudes from the holder for contact with the wheel or surface to be trimmed or dressed. Diamonds so held have to be mounted in a holder with considerable care, both from the standpoint of selecting the proper portion of the stone to protrude from the holder, and from the standpoint of most securely holding the stone in position during the hard use to which` a tool of this nature is put.

In mounting a stone in a holder of the known type, the holder is usually provided with a recess in which the stone is positioned, with a pointed end of the irregularly shaped stone protruding slightly beyond the holder. Then by manipulation of the material of the body of the holder, parts of the material `of the holder are forced around the stone and caused to embrace the same and hold it firmly. After a period of use, when the point of the stone becomes worn, it is necessary for the stone to be reset in its holder. This requires the user of the tool to return itk to the manufacturer, who resets the stone by removal of it from the holder and repositioning and replacement of it therein so that a new pointed surface on the stone will project from the end of the tool.

The object of the present invention is to provide a tool for holding a diamond in which the objections to the present-day structure are eliminated and the efficiency of the tool greatly increased. More particularly, the invention contemplates the provision of a diamond of regular formation and preferably of octahedron shape and formed with a plurality of similarly shaped pointed ends, and in the provision also of a diamond-gripping means by which the diamond may be rmly held in a. selected position with any one of such pointed ends protruding from the holder in such a way as to permit its most effective use.

'Ihe invention also contemplates the provision of a releasable diamond-holder by which the user of the tool may, when required, shift the position of the diamond within the holder to. thereby enable any selected one of the pointed ends possessed by the diamond to protrude from the tool into operative position. The use of the shape of diamond suggested and a releasable holder therefor not only incerases the material life of the diamond: but enables the same to be adjusted whenever required by the workman, without necessitating the return of the tool to the manufacturer for resetting.

These and numerous other advantages are attained by the structure, a more particular description of which will appear hereinafter' and be set forth in the appended claims.

In the accompanying drawing, forming a part hereof, Fig. 1 is a sectional View through a tool constructed in accordance with .the invention; Fig. 2 is a plan View of the same; Fig. 3 is al sectional view of the head of the tool, showing the parts thereof in separated relation; and Fig.

4 is a perspective view of the diamond used in the tool.

In the manufacture of a diamond-holding tool of the character contemplated by the present invention, it is necessary that the diamondsemployed in the tool be of uniform shape to not only enable the same to be securely held in the holder intended for its reception, but to insure the uniform projection of each pointed end of the diamond from its holder when placed in either of the several positions in which it may be held. In the manufacture of diamond-holding tools of known construction, no effort has been made to preshape the diamonds employed, such diamonds being selected at random and utilized to best advantage to enable a pointed end on the selected diamond to project from the holder.

In carrying out the invention, I therefore shape the diamond by grinding, to form it into uniform shape, I have found the octahedral or bypyramidal shape shown in Fig. 4 to be most desirable. It will be seen that a diamond so shaped is provided with six pointed terminals, namely those indicated at l to 6 inclusive. A diamond so shaped is provided with a four-sided girdle l composed of edges 8, 9, I0 and Il disposed at right angles, said angular girdle constituting means by which the diamond may be. embraced in the holder or tool as shown in Figsfl and 2, and by which rotative shifting of the diamond within the tool, as well as any shifting movement of the diamond in a directionlongitudinally of the body of the tool is prevented.

The tool for holding the diamond is shown in Figs. 1 to 3 inclusive and it will be there seen that the same is provided with a body portion l2 having a holding device formed on or attached at one end for engaging and securely holding a diamond of the form disclosed in Fig. 4. Said holding device includes the four jaws I3, each of said jaws bengnotched as at I4 and thereby engaging over one of the edges 8, 9, I and Il as clearly shown in Fig. 2, so that the diamond, when held between the four jaws, is engaged at its four sides and is effectively held against rotative movement relative to the jaws. It will be noted that when the diamond is held between the four jaws in the manner set forth, one of the six pointed ends of the diamond will be disposed between and project outwardly from the jaws so that it may be held against a grinding wheel or used for any of the purposes for whcih diamond tools of this character are normally employed.

The jaws I3 are heldin gripping position by means of the clamping member or ring l5 which is internally threaded for reception upon the threaded portion of the jaws, said ring l5 having an internally tapered surface I6 operative against the similar surface l1 on the jaws to force the same toward one another and hold the diamond securely between them'.

The octahedron or bipyramidal shape of the diamond enables it to be so vpositioned within the jaws that any one of the pointed ends on the diamond may be positioned outermost and employed as the grinding or dressing element. Thus, when one of the points becomes worn after use, it is merely necessary to loosen the diamond in the holder and shift it to bring another of the points of the same into projected or outermost position. Since the diamond, in the form shown, is provided with six similar points which may be successively used by repositioning the di-amond in the holder, it will be apparent that the useful life of the diamond will be long and this will more than compensate for the time and eiort expended in originally grinding the dia mond into uniform octahedron shape.

Moreover, since the diamond may be shifted from one possession to another by the tool owner, and need not leave his possession at any time for adjustment or re-setting of the diamond, the. tool is of increased value bec-ause of the fact that it remains constantly at hand and in the possession of the owner. Additionally, since the diamonds provided for the holder are all of uniform shape, the holder will last indefinitely, While I have shown the holder of a-certai structure and provided with four jaws to accomaaeaa'eo modate -a diamond of the octahedron shape, it will be obvious that both the holder and diamond therefor may be of other shape, and other modifications may be made without departing from the spirit of the invention.

What I claim is:

1. A diamond-holding dressing tool comprising a diamond of octahedral form, and a holder in which the same is mounted, said holder including a plurality of jaws for engaging the girdle of the diamond on four sides only to thereby grip the diamond and hold the same with all pointed ends of the diamond projecting between the jaws.

2. A diamond-holding tool comprising, a diamond of octahedral form, a holder in which said diamond is gripped, said holder comprising a plurality of spaced jaws notched to engage over the girdle of the diamond and constituting the sole means of supporting the diamond, the diamond having a plurality of pointed ends, all of which are disposed between and not engaged by the jaws.

3. A diamond-holding tool comprising, a diamond of octahedral form, a holder in which said diamond is gripped, said holder comprising a plurality of spaced resilient jaws notched to engage over the girdle of the diamond, the jaws being so spaced apart that all of the pointed ends on the diamond are disposed between and not engaged by the jaws, and means for causing the jaws to be exed toward one another.

4. A diamond-holding tool comprising, a diamond of octahedral form, a holder in which the same is removably held, said holder having a base portion, four spaced resilient gripping jaws extending therefrom, each ofsaid 'jaws being provided with an angular notch adapted to engage over the girdle of the diamond, the four jaws constituting a sole means of supporting the diamond between them, the portions of the jaws engaging the diamond being spaced from one another whereby one pointed end of the diamond protrudes outwardly from the ends of the jaws and other pointed ends of the diamond are located between and out of Contact with the jaws, and means for forcing the jaws toward one another to cause them to clamp the diamond Y-between them.

JULIUS DINHOFER.