US726902A - Stone-saw. - Google Patents

Description

. PATENTBD MAY 5, 1903; 0. K. GEGRGE & J. BURNETT.

STONE SAW. APPLIUATIOH FILED JUNE 18, 1902.

N0 MODEL.

CORTIS K. GEORGE AND JOHN BURNETT, OF MILFORD, NEW HAMP$HIREf Patented May 5, 1903.

PATENT OFFICE.

STON E-SAW.

SPECIFICATION forming part of Letters Patent No. 726,902, dated May 5, 1903.

Application filed June 18, 1902. Serial No. 112,254. (No model.)

To all whom it may concern.-

Be it known that we, GoRTIs K. GEORGE and JOHN BURNETT, citizens of the United States, residing at Milford, in the county of Hillsboro and State of New Hampshire, have invented new and, useful Improvements in Stone-Saws, of which the following is a specification.

Our invention relates to improvements in saw-blades such as are designed for sawing stone; and it has for its general object to provide a blade for sawing hard'stone embodying such a construction that it is adapted when in a kerf to permit the abrasive substance employed to freelycpass down to. and under the teeth and serve its purpose to the best advantage.

Other advantageous features of the improved saw-bladewill be fully understood from the following description and claims when taken in conjunction with the accompanying drawings, in which Figure l is a side elevation of a portion of a saw-blade embodying our invention; Fig. 2, a top plan View of the same; Fig. 3, an inverted or bottom plan View; and Fig. 4, a transverse section taken in the plane indicated by the broken line 4 4,extending'through Figs. 1 and 2.

Similar letters of reference designate corresponding parts in all of the views of the drawings.

In the present and preferred embodiment of ourinvention the saw-blade comprises teeth A, which are of a common thickness throughout and are preferably tapered or gradually reduced in widthvfrom their upper to their lower edges, and longitudinal central-portions B intermediate of the teeth and of a less thickness than the same in about the proportion shown, the said intermediate portions having their upper edges flush with those of the teeth and also having concave lower edges a, so that the teeth will be strongly joined together, and yet the lower edges of the same alone will bear on the bottom of the kerf in a stone that is being out. At one end the blade is preferably provided with a shank 1), corresponding in thickness to and disposed in the same plane as the intermediate portions B and designed for the connection of a handle or means employed to actuate the blade. By virtue of the intermediate portions B being of a less thickness than the teeth A and disposed in the longitudinal center of the blade it will be observed that intermediate spaces 0 are afforded at either side of the portionsB and extending through out the height of the blade. These interdental spaces serve when the blade is operating in a kerf of a stone to permit the abrasive substance employed to freely gravitate to the bottom of the kerf and pass under the lower edges of the teeth, where it will obviously be most effective in assisting and accelerating the sawing of the blade. It will also be observed that the construction of the saw-blade is such as to obviate wedging the shot between the side walls of the kerf and the blade, and hence the surface of the out does not have the ragged appearance of a cut made withthe clearshot and "an ordinary saw-blade.

We have entered into a detailed description of the construction and relative'arrangement of the parts embraced in the present and preferred embodimentof our invention in order to impart a full, clear, and exact understanding of the same. We do not desire, however, to be understood as confining ourselves to such specific construction and arrangement of parts, as such changes or modifications may be made in practice as fairly fall within the scope of our claims.

Having described our invention, what we claim, and desire to secure by Letters Patent,

l. A blade for sawing stone comprising teeth of a common thickness throughout their height, arranged at a suitable distance apart, and longitudinal central portions of a less thickness than and corresponding in height to the teeth, arranged intermediate of the same, whereby interdental spaces extending throughout the height of the blade, are formed at either side of the longitudinal central portions for the free passage of abrasive substance to the bottom of a kerf in which the blade is disposed.

2. The blade described for sawing stone IOO comprising the teeth of a common thickness In testimony whereof We have hereunto set throughout, tapered or gradually reduced in our hands in presence of two subscribing Wit- [0 width from their upper to their lower edges, nesses.

and longitudinal central portions of a less OORTIS K. GEORGE. thickness than the teeth, arranged interme- JOHN BURNETT. diate of the teeth with their upper edges flush Witnesses:

with those of the teeth, and their lower edges FRANK A. BURNHAM,

oonoaved. HENRY BURNETT.

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