US144317A - Improvement in stone-sawing machines - Google Patents

Description

H. COTTRELLl l y StuneiSawing Machiqgs. N0.144,317.T

Patented Nov. 4,1873.

UNITED STATES PATENT OFFICE.

HERBERT COTTRELL, OF NEWARK, NEW JERSEY.

IMPROVEMENT VlN STONE-SAWING MASHINES.

Specification forming part of Letters Patent No. 144,317, dated November 4, 1873 5 application filed May e, 1873.

To all whom fit may concern:

Be it known that I, HERBERT COTTRELL, of the city of Newark, county of Essex, State of New Jersey, have invented certain Improvements in Stone-sawing Machines, of

i whichthe following is a specication:

My invention relates to a series of sections or pieces of steel, in which are partly embedded carbons or black diamonds, presenting a projecting cutting-surface in the ordinary manner, in combination with a running endless metallic band, passing over rapidlyrevolving pulleys above and below, constructed and operating in a manner similar to the well-known band-saws for Working in wood, the steel sections, armed with carbons, taking the place of teeth at intervals, and the pulleys being covered upon the surface coming in contact with the band with a yielding' or elastic substance, to protect the sections and carbons from contact with and wear upon the pulleys.

The high velocity attained by this method enables the execution of many times the amount of work obtained by any other plan for using the diamond in connection with sawblades.

The motion of the saw being in one direc- Ition only, the tendency is to press the carbons more iirmly in their sockets, and does away with the liability of their becoming loosened and falling out, as in reciprocating saws.

In the accompanying drawing the manner in which my invention is or may be carried into effect is clearly represented.

Figure l is a perspective view of a machine embodying my improvement. Figs. 2

Vand 3 are views of details hereinafter declined in such position that the revolution of the band will tend to force the carbons more rmly therein.

The steel sections B are preferably formed as shown in Fig. 2, the edge a projecting beyond the face of the section which is next to the band, so that when the section is applied to the band its said edge a will overlap the edge of the band, as indicated.

In Fig. 3 I have represented a way of male ing the band of uniform thickness, thus enabling it to pass between guides for the purpose of steadying it. In the band shown in Fig. l the sections project from the outer surface of the band; but in the one now under consideration, the band is in substance formed of two series of metallic strips, placed face to face and fastened together, the carbon sections being set in between the adjoining ends of the stripsvof one series, so that they will be iiush with the faces of these strips.

rlhe band, with its carbon sections, is de signed to run over upper and lower pulleys, G, supported by suitable framing D, which also carries a horizontal table, E, intermediate between the pulleys. The front vertical part of the band passes down through the table, as indicated in Fig. l.

In order to facilitate the movement of the stone in any desired direction on the table, friction rollers or balls c are provided on the upper face of the table, held in suitable sockets, and projecting somewhat above the surface of the table, so that the stone can rest on them.

The peripheries of pulleys C are covered, as indicated at d, with leather, vulcanized rubber, or other elastic or yielding substance, for the purpose hereinbefore mentioned.

What I claim, and desire to secure by Letters Patent, isfl. The abovedescribed endless metallic' running band, in combination with sections or pieces of steel placed at intervals inthe edge of said band, in which sections of steel carbons are partly embedded, and present a projecting cutting-surface, substantially as set forth. y

2. The endless metallic ruiming band with carbon-armed sections, in combination with upper and lower pulleys, the periphery of which is covered with a yielding or elastic substance, substantially as and for the purposes set forth.

HERBERT GOTTRELL. `Witnesses I. M. TAYLOR,

I-I. C. Cornici?.

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