US824946A - Stone-saw. - Google Patents

Description

No. 824,946. PATENTED JULY 3, 1906. I. M. MoKAY.

STONE SAW.

APPLICATION FILED FEB. 16'. 1906.

0/11/11,, [11/11/11, vl/myl ISAAC M. MGKAY, OF FRUITVALE, CALIFORNIA.

STONE-SAW.

Specification of Letters Patent.

"ratented July 3, 1906.

Application filed February 16, 1906. Serial No. 301,412.

To an /1101)), it may concern:

Be it known that I, ISAAC M. MoKAY, a citizen of the United States, residing at Fruitvale, in the county of Alameda and State of California, have invented new and useful Improvements in StoneSaws, of which the following is a specification.

My invention relates to stone-saws, and especially to the blades of stone-saws which employ chilled shot, sand, or like abrading material to make the cut.

In stone-saws where a blade is used consisting of a long flat steel plate supported at both ends and reciprocated in the direction of its length it is a matter of difficulty to get the shot down underneath the blade so that the blade will ride on the shot, and thereby press the shot into the stone to effect the desired cutting operation. WVith these hori zontal blades the shot,withasuitable supply of water, is usually fed into the cut above or at the sides of the blade and left to find its way as best it may down between the side of the saw-blade and the stone. The result is that the shot cuts and scours the sides of the slabs, widens the cut, and deflects the saw, since when it finally reaches the bottom of the cut it does not get under the blade properly, but wears the blade on its corners until the bottom of the blade becomes sharp and more or less V-shaped in cross-section. A

. sharp blade is sure to cut crooked.

The object of my invention is to provide a simple cheap stiff practical blade of the horizontal endwise-reciprocating type, which will be provided with suitable channels for feeding the shot to the under side of the blade without its having to come necessarily into abrading contact with the sides of the cut.

The invention consists of the parts and the construction and the combination of parts, as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which Figure 1 shows an elevation and edge view of a blade embodying my invention in its preferred form. Figs. 2, 3, and i show similar views of modifications of the invention.

A repesents a blade of any suitable length, width, or thickness. The blades are usually of steel and about three-sixteenths of an inch thick by four or five inches wide, more or less, and several feet long, with suitable means at the ends for its rigid attachment in the sawframe. The blade is designed to be reciprothe blade to have ready access to the bottom I of the cut and directly under the blade. The drawings show various ways III which these channels may be formed. In Fig. 1 the corrugations are shown as sinuous or zigzagged,

which is the preferred form, since this arrangement has the great advantage of giving increased stiifness to the blade both against stretching and against bending. Usually with a four or six inch blade the corrugations will make only one bend 3 but if wider blades are desired the corrugations may have a correspondingly augmented number of bends 3, as in Fig. 2.

The corrugations or channels may have flat 01' curved bottoms in cross-section, as indicated, respectively in Fig. 1 and Fig. 2.

The depth and the corrugations are prefer ably equal to or slightly in excess of the diameter of the shot or other abrading material used. Ordinarily with a blade three-sixteenths of an inch thick the sides of the finished blade will be offset, so that the blade will have a sinuous cutting edge to effect a cut approximately three-eighths of an inch wide.

The channels not only lead the shot down to the bottom of the cut and out of abrading contact with the walls of the cut, but they direct the shot into the sinuations of the cutting edge and directly beneath and in the center of the blade.

By this construction the blade is strengthened and stiffened, a continuous bearing-sur-' face on the under side of the blade is preserved, and the shot supplied by each channel finds its way directly under and in the middle of the path of a correspondingly-offset part of the blade. Practice shows, further, that this style of blade cuts faster and wears longer than a plain unchanneled blade. It cuts straight and makes a smooth out through the stone. The slabs are not scoured and scratched as they are by a plain straight blade using shot.

The channels may be formed by rolling or stamping or by any other appropriate means.

l/Vhen a blade is worn down nearly to an angle 3 of the corrugations, the blade may be turned over. The zigzag channels thus permit the use of a blade after it has become worn down very narrow and still the blade will be stifi. and continue to cut straight.

Having thus described myinvention, what I claim, and desire to secure by Letters Patent, is

1. An improved saw having a blade of uniform thickness with a sinuous cutting edge, the opposite sides of the blade being corrugated in corresponding lines which extend sinuously from said cutting edge to the back of the blade said side sinuous corrugations communicating with the sinuations of said cutting edge.

2. An improved saw having a blade of uniform thickness and -With a sinuous cutting edge, saidblade having its sides provided With other sinuous corrugations which communicate with the sinuations of said cutting edge.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ISAAC M. MoKAY.

Witnesses:

J. T. HoLLENBEoK,

J. W. ELRoD.

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