US1730756A - Sawing strand - Google Patents

Description

Oct. 8, A1929. R, E BRWN 1,730,756

SAWING STRAND Filed July 5, 1928 Imagna/020: H05/SET E 560mm@ www4 Patented Oct. 8, 1929 UNITED STATES .PATENT OFFICE4 ROBERT E. BROWN, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO THE AMERICAN STEEL AND WIRE COMPANY OF NEW JERSEY, A CORPORATION OF NEW JERSEY SAWING STRAND Application led J'uly 3,

This invention relates to an improved construction of wire strand adapted for cutting stone and similar hard bodies, and has for its object the provision of such a st-rand composed of av cutting core member and a plurality of carrier-wires laid around the core and adapted to carry the longitudinal stresses,` while the cutting core takes all the abrasive wear caused by the cutting.

Another obj ect is to provide a novel cutting core constructed in the form of a narrow strip of hard metal, such as steel, having a rectangular cross-section and twisted about its own axis to form a helix, thereby forming helical grooves around the core'in which the carrier-wires are laid.

A further object is to provide a wire cutting or sawing strand having the novel design,`construction and combination of parts hereinafter described and illustrated in the accompanying drawings.

In the drawings- Figure 1 is a perspective elevation of a section of cutting strand constructed in accordance with this invention.

Figure 2 is a transverse section through the strand of Figure 1.

Figure 3 is a perspective elevation of` a slightly modified form of strand.

Figure 4 is a transverse section throughthe strand of Figure 3.

Referring more particularly to the Figures l and 2 of the drawings, the numeral 2 designates the cutting members which form a core for the strand. The cutting members 2 are formed from thin, relatively narrow, fiat strips of steel or other hard metal and have a rectangular cross-section. These narrow strips of steel are twisted about their own axes to form helices. The twisted edges 3 of the strips 2 form cutting edges and the grooves 4 of the helices form seats to receive carrier-wires 5 which are of relatively soft ductile metal.

The two cutting core members 2 are laid up in parallelism side by side with the grooves 4 in line, and the carrier-wires 5 are laid up in said grooves and twisted around` said cores so as to bind said cores together; and they also 1928. Serial No. 290,122.

serve to carry the propelling stresses of said strand.

The carrier-wires 5 are of materially less cross-section than the area of the grooves 4 andlie entirely within said grooves 4 below the cutting edges 3 of the cores 2, so that the cores do all the cutting and receive all the abrasive wear caused by the cutting.

In Figures 3 and 4a lighter or smaller cutting strand having a single cutting core 12 is shown. The cutting core 12 is formed exactly like the cutting cores 2 and has twisted cutting edges 13 and grooves 14 to form seats to receive ductile metal carrier-wires 15.

There are only two carrier-wires laid up in this strand since there are only two grooves in the core 12'. The carrier-,wires 15 are like the carrier-wires 5 of Figures 1 and 2 in that they are of materially less cross-section than the area of the grooves 14 and lie entirely within the grooves 14 below the cutting edges 3 of the core 2,`so that edges of the core will receive all the abrasive force due to cutting.

In operation, the'strand of this invention will be used in the lusual mannerto form a continuous cutting band which is caused to travel across the surface to be cut, and sand and lwater are used to facilitate the cutting action of the cores.

The carrier-wires which are mounted below the cutting edges of the cores, do not contact with ,the surface being cut and receive none of the wear caused by the cutting operation but serve only to add tensile strength to and carry the relatively hard core members.

In case of breakage of the core members, the carrier-wires will serve to hold the core members and the cutting operation will not be interrupted.

While I have shown and described certain specific embodiments of -my invention I do not wish to be limited thereto since various modifications may be made without departing from the scope thereof, as defined in the appended claims.

I claim 1. A iiexible sawing strand comprising a cutting core composed of a strip of metal substantaialljT rectangular in cross-section and twisted about its own axis to form a helix,

and carrier-wires laid up in the grooves of said helix and having a lesser cross-section than the depth of said grooves s'o asto lie entirely within said grooves. I

2. A- flexible sawing strand comprising a pair of cutting cores laid up in parallelism side by side, said cores being composed of strips of metal substantially rectangular in cross-section and twisted about their own axes to form helices, and a plurality of carrierwires laid up in the grooves of said helices so as to bind said cores together, said carrierwires having a lesser cross-section than the depth of said grooves so as to lie entirely within said grooves.

3. A flexible sawing strand comprising a relatively hard metal cutting core composed of a strip of metal substanatially rectangular in cross-section and twisted a ut its own axis to form a helix, and a plurality of rela tively soft, flexible carrier-wires laid up in the grooves of said helix and havin Va lesser cross-section than the depth of sai grooves so as to lie entirely within said grooves.

4. A liexible sawing strand comprising a pair of cutting cores laid up in parallelism side by side, said cores being composed of strips of relatively hard steel substantially rectangular in cross-section and twisted about their own axes to form helices, and a plurality of relatively soft carrier-wires laid up in the grooves of said helices and extending around both of said cores so as to bind said cores together, said carrier-wires having a lesser cross-section than the depth of said grooves so as to lie entirel within said grooves.

In testimony w ereof, 1 have hereunto set my hand.

ROBERT E. BROWN.

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