US717702A - Stone-boring machine. - Google Patents

Description

No. 717,702. 'PATENTED 'JAN.6,1903. J. P, MURPHY. $770175 BORING MAGHINE.

APPLIGATION FILED JAN. 6, 1902.

I 1X0 MODEL.

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' shown.

UNITED STATES PATENT OFFICE. I

JOHN P. MURPHY, OF PORTLAND, MAINE.

STONE-BORING MACHINE.

SPECIFICATION formingpart of Letters Patent No. 717,702, dated January 6, 1903.

Application filed January 6, 1902- Serial No. 88,583. (No model.)

To whom it 771.09g concern:

Be it known that I, JOHN P. MURPHY, a citizen of the United States of America, and a resident of Portland, Cumberland county, State of Maine, have invented certain new and useful Improvements in Stone-Boring Machines, of which the following is a specification.

My invention relates to a machine for boring annular holes in stone, and it is designed particularly for boring out hollow columns and the like from granite or other hard stone,

it being provided with a head having cut tin g-blades laterally and vertically adjustable therein, so that difierent-diametered columns and difierent depths may be produced and also several concentric holes can be made simultaneously.

With this end in view my invention consists of a vertical shaft, on the lower end of which is a cutter-head carrying vertical blades adapted to travel in the annular groove. The blades may by suitable fastening means be adjusted for difierent diameters, and they may be so set as to bore several concentric holes at the same time.

I illustrate my invention by means of the accompanying drawings, in which- Figure 1 is a front elevation of the machine. Fig. 2 is a plan view of the cutterhead, and Fig. 3 is a section on the line 00 a: of Fig. 2.

A represents the framework of themachine, and e is the vertical shaft, held in suitable hearings in the frame, so that it has a longitudinal motion in its bearings, as herein Power is applied to the shaft by the pulley g, connected to the shaft by means of the spline 1, so that the shaft may move freely in a vertical direction, while the pulley remains stationary. On the lower end of the shaft is the cutter-head h, here shown as formed in one piece, with radial arms h, the outer ends of the arms being joined by means of a band or rim. The cutting-blades c' are held in a vertical position and secured to the radial arms of the cutter-head by means of the clamps J. These clamps are composed of a lower block'j, fitting in the radial groove which is formed in each arm, the upper block j bolted to the lower block by the screw j and the upper and lower clamps 7' bolted to the blocks by screws by which the vertical blades are held to the adjustable clamp. The lower edge of the lower block has flanges or projections which impinge on the under side of the arm, and the upper block has like flanges, by which the two portions of the block are firmly fastened in position on the arm at any desired point. The blades extend up through the slots in the arms and are clamped to the outer face of the blocks by the upper and lower clamps. It will be seen that the clamps may be readily fastened at any point on the arm, and the blades may be fastened at any point in their height.

For the purpose of taking a portion of the weight of the cutter-head from 06 the blades 71 I provideacounterweight 0, connecting with the top of the shaft by means of a cord 11, running over pulleys a a, the end of the cord being secured to ayoke d on the upper end of the shaft 6.

The operation of my machine is as follows: The blades'z' are set at the required point to cut the annular groove desired, and a shallow groove of the diameter desired is cut in the stone by hand. The stone is placed under the cutter-head and the blades caused to travel in the groove, chilled-iron shot being placed in the bottom of the groove, as is usual in stone-cutting tools. The blades will cut their way rapidly through the stone and take out" a core of any desired diameter up to the capacity of the machine. In practice I start a groove with short blades, and after getting down into the stone I shift the blades for longer ones.

It will be seen that by setting a portion of the blades inside of the others two grooves may be cut at the'same time of different diameters. Thus two or more hollow columns of different diameters may be cut at the same time on the machine.

It is evident that the cutter-head may be given a rotary and vertical motion otherwise than by the means here shown'-as, for instance, by having the cutter-head splined to the shaft instead of being secured rigidly to it, as here shown; but such modification would come within the scope of my invention.

I claim 1. In a stone-boring machine, the combination of a frame, a shaft mounted revolubly -be held vertically adjustable by the clamp.

2. In a stone-boring machine, the combination of a cutter-head, comprising a series of radiating arms each provided with a slot therethrough, a clamp made in two members one spanning the slot of each arm and the other entering the slot from below and provided with means to draw the members together and secure the clamp upon the arm, a fiat blade projecting through the slot of each arm, and clamps adjustably secured to the firstmentioned clamp for adj ustably securing the blades, so that they can be vertically adjustable.

Signed at Portland, Maine, this 26th day of December, 1901.

JOHN P. MURPHY. Witnesses:

S. W. BATES, HARRY B. Ross.

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