US1178687A - Method of setting diamonds into tools. - Google Patents

Description

. ELM. STRICKLAND.

METHOD OF SETTING DIAMONDS INTO TOOLS.

APPLICATION FILED NOV. I9, 1915.

1 ,178,687. Patented Apr. 11, 1916.

A IIIH;

' UNI/5M0? ELWIN M. STRICKLAND, OF DETROIT, MICHIGAN.

METHOD OF SETTING DIAMONDS INTO TOOLS.

Specification of Letters Patent.

Patented Apr. 11, 1916.

, Application filed November 19, 1915. Serial No. 62,384.

To all whom it may concern Be it known that I, ELWIN M. STRICK- LAND, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Methods of Setting Diamonds into Tools, and declare the fol lowing to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification. I

My invention relates to methods of setting diamonds into tools for mechanical purposes and consists in the construction and means whereby the diamond is securely held in such tool for mechanical purposes, such as turning emery wheels, or any purpose for which such tools are employed. 1

It is obvious that diamonds should be set in tools in such a manner that they can not be detached therefrom or loosened therein during the mechanical operations which they are called upon to perform. The setting must not only be rigid but the material in which they are set must be sufliciently resistant to heat so that the setting will not melt or be detached or loosened.

I accomplish the objects of my invention in the most perfect manner'by the means hereinafter set forth and claimed.

In the drawings Figure 1 is a partial sectional, vertical and horizontal view, showing the first step in the process. Fig. 2, is a view showing the second step of the construction of the tool with the upper portion as a plan view thereof. Fig.3, is a partial sectional view of the same tool diamond inserted therein and held for the purpose of cementing, as hereinafter stated, the upper portion being a plan view thereof. Fig. 4:, is a partial sectional view of the same tool with a diamond inserted therein and the matrix cast thereon, with the upperportion as a plan view. Fig. 5, shows the completed tool with the point of the diamond exposed, the upper portion being a plan view also of the end of the tool.

Similar letters refer to similar parts.

In the drawings, A represents th head of the tool which may be attached to a shank B or formed integral therewith and which may be adapted to be attached to any convenient holding tool. The holding portion but with the A, formed from a solid bar, is drilled out I centrally at O, as shown in the lower ortion of Fig. 1. A circular cut or groove is formed which leaves a wall E of a cup formed between the groove D and the outer to face of the tool. This is the first step in the process of, forming the holder. -There is also a circumferential inner wall F which surrounds the cavity C and extends to the outer face of the tool, as shown in Fig. 1. This is the first step in the formation of the tool. The next step consists in cutting notches G, G in the inner wall F. In'Fig. 2, I have shown six of these notches. These notches are cut deep enough and with a slight slope so that the bottom of the groove communicates with the central cavity C with an incline. This forms the inner wall Finto what is termed a castellated shape. This constitutes the second step in the formation of the tool which is now ready for the insertion of the diamond. In Fig. 3, I have shown the diamond H in position; the dlamond is inserted in the central cavity C and the prongs of the castellated wall F are knurled down .over the diamond, as shown at F. This holds the'diamond in position but is not sufliciently rigid to enable it to do any work, as the diamond never, or seldom, conforms in its lower part H with the shape of the cavity 0. This forms the 5 third step. In orderto fix the diamond firmly in position, metal of a lower melting point than that of the tool, which is preferably made of steel, as for instance brass, is in the usual manner (with a flux) melted in and over the diamond, as shown in Fig. 4, at J. The castellated openings in the wall F permit this molten metal J to flow through and enter the cavity underneath the lower part of the diamond, as at J, filling all of the crevices that may exist and thus absolutelyhold the diamond in a perfectly fitting matrix which is as rigid as the solidified metal itself. This forms the fourth step. In the fifth step the surplus metal J at the end of the tool, as at K, is ground away, leaving the point of the diamond H exposed. The tool is then finished.

It is obvious that any selected point can be e osed in the manner specified. It is also 0 vious that when the point is worn so as to become defective or useless the sealing metal can be melted out, the lips of the eastellated wall K raised, and, the diamond taken out and turned, when it can be sealed again in the same manner as hereinbefore described.

I am aware that diamond-holding tools have been made with a castellated wall and attempts have been made to seal the diamond in the central cavity inclosed by such wall, but the difiiculty has been that the sealing material would run out and would not firmly hold the bottom of the diamond in the cavity. By making a cup-formed wall E, which has no grooves or other outlets, I

am enabled to seal the diamond securely and surely in the manner heretofore stated.

What I desire to claim is:

1. The process of attaching diamonds to tools for working purposes, consisting first in forming the tool with a central cavity to hold the diamond, an outer imperforate wall, an intermediate groove between said wall sealing material melted into said cavity and surrounding said diamond leaving the point exposed for use, substantially as described. In testimony whereof, I sign this specification.

ELWIN M. STRICKLAND.

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