US249646A - Securing diamonds in metallic plates for stone-saws - Google Patents

Description

(.No Model.) v

A. H. LUUAS &, E. G. KEYS.

SEOURING DIAMONDS IN METALLIC PLATES FOR STONE SAWS.

No. 249,646. Patented Nov. 15,1881.

Vfizziizz 12142212 02 AUSTIN H. LUCAS AND EZRA O. KEYS, OF ALLEGHENY, PENNSYLVANIA.

SECURING DIAMONDS IN METALLIC PLATES FOR STONE-SAWS.

SPECIFICATION forming part of Letters Patent No. 249,646, dated November 15, 1881. I

Application filedJuly 28,1881. N0 model.) A

To all whom it may concern:

Be it known that we, AUSTIN H. LUCAS and EZRA O. KEYs, citizens of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have in ven ted certain new and useful Improvements in Securing Diamonds in Metallic Plates for Stone- Saws; and we do hereby declare thefollowingto be 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, reference being had to the accompanyin g drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Our invention relates to an improvement in securing diamonds or carbons in metallic plates that are to be clamped or wedged in openings in the saw-blades for sawing stone, and in introducing a plate of'iridium in front of the' diamond to protect the diamond-holding plate against the destructive action of sand during the operation of sawing.

The object of our inventi n1 is twofold: first, to secure the diamonds ot' saws for sawing stone in their position; and, secondly, to protect the metal plates in which the diamonds are embedded against the cutting of the sand, which is very destructive in front of the diamonds.

The known processes of placing and securing diamonds in their proper positions on sawblades for sawing stone are very slow, difficult, and costly, and require a degree of skill not attained by ordinary mechanics. It is therefore of great importance to discover a means by which the diamonds can be readily placed and rigidly held until worn out, when the holding-plate can be removed from the saw-plate to be recast and used again. There is also, aside from the placing and holding of the diamonds in their proper positions, another difficulty toovercome-viz, the cutting away by the sand of the plate that holds the diamondwhich is so rapid as to require new plates before the diamonds have become unserviceable, and although the hardest steel has been used for making these plates they only have in part answered the purpose. To remove these 01)- jectionable features we have made the improvements hereinafter described.

The accompanying drawings represent our invention.

Figure 1 represents a side view of the holding-plate with the diamond inserted. Fig. 2 shows the holding-plate with a diamond and a plate of iridium in front of it.

The holding-plate A is similar in form to thatshown in PatentNo. 180,429, tapering from the heel to its somewhat thicker rounded upper edge that protrudes beyond the edge of the saw-blade. This plate is inserted into a fittin g-openin g in the saw-blade, and there confined by wedges from underneath and kept from sliding sidewise by means of grooves at its straight side edges and corresponding V- bevels on the saw-blade. In the center of the plate A is an opening, from which extends up ward to the base of the diamonda narrow slit, to, which may be outafter the diamond has been embedded, or be made in casting of the plate. The slit a is to impart a degree ofcompressibility to the upper end of the plate A, for additionally securing the diamond placed above. The plate A may also be made of two equal parts jointed longitudinally, and to increase its elasticity incisions b may be made, as shown in the said patent.

The material .we use for the plate Ais what is commonly called phosphor-bronze metal. This, when melted, is run into molds, to be chilled. In the molds, previous to .the introduction of the metal, the diamonds care placed and adjusted so that the metal, when poured in, surrounds and holds them. This metal possesses great hardness with pliability, by

which it is peculiarly adapted for the purpose,

and from experience it is ascertained that it holdsthe diamonds betterthan anyotherknown substance. In front of the diamond, in the upper edge of the plate A, is a slight cavity dovetailed at its sides, and into this a plate, 6, of iridium is forced toward and in contact with the diamond; or the iridium may be placed in the mold with the diamond and attached to the plate in the casting, either of which answers the same purpose. The plate of iridium, being ofgreater hard ness than any other metal known,

prevents the sand from cutting the plateA at cured thereto, with a piece of iridium, which the base of the diamond, and assists to some is inserted in the edge of the plate in advance extent in cutting the stone, and may, when of thecutting-point,substantially as described.

properly shaped, be used for cutting the softer 3. A saw for cutting stone, provided with 15 kind of stones without the diamond. pieces of iridium, which are inserted in its cut- Having thus described our invention, we ting-edges, substantially as set forth. clain1 AUSTIN H. LUCAS.

1. In a saw, the plate A, made of phosphor- EZRA O. KEYS. bronze metal, substantially as shown.

2. In a saw, the combination of a removable plate having a diamond or cutting-point se- I Witnesses:

T. F. LEHMANN, J AMES MEsKILL.

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