US127125A - Improvement in tunneling-machines - Google Patents

Description

43h "Sh A. w. VON SCHMIDT.

improvement in T nneling-Machine. No. 127,125. Patented May 21,1812.

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Patented May 21,1872.

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Improvement in Tunneling-Machine.

No. 127,125, Patented May 21,1872.

UNITED STATES PATENT OFFICE.

ALLEXEY W. VON SCHMIDT, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN TUNNELlNG-MACHINES.

Specification forming part of Letters Patent No. 127,125, dated May 21, 1872.

cisco and State of California, have invented a new and useful Improved Machine for Outting and Running Tunnels in Rock, called the Diamond Circular Groove Tunneling Machine;

and I do hereby declare that the following is a full, true, and exact description thereof, reference beiu g had to the accompanying drawing and to the letters of reference marked thereon making a part of this specification.

My invention has for its object the production of a drilling-machine which shall cut an annular groove and a central blasting-hole; and consists in the peculiar construction and arrangement of the parts to be hereinafter explained.

To enable those skilled to make and use my improved drill, I will proceed to describe the construction and operation of the same, referring byletters to the accompanying-drawing, in which- Figure 1 is a side elevation; Fig. 2, a top View of the bed-plate, hollow cylinder, and main shaft, as will be more fully explained.

' Fig. 3 is a top view of the machine. Fig. 4. is

a front view of the main circular head or drum gearing with diamond-cutters; Fig. 5, a section through Fig. 4, with the segments turned up, as will be presently explained; Figs. 6, 7,

8, and 9, detail views for special reference by letters; and Fig. 10 is a rear view of the machine, showing the cog-gear as well as the rails in the tunnel for the machine to run upon, and

the inside rail for stone-truck represented by Fig. 9.

Similar letters denote like parts in the several figures.

A represents a cast-iron bed-plate, mounted upon trucks a. This plate is made of considerable weight and strength. In a machine of the proper size to run a tunnel eight feet in diameter it should be about thirteen and a half feet in length. The rear portion, upon which the engine rests, (for a distance of four feet,) is six feet wide, and the remaining or forward portion is of a width suflicient to sustain the cylinder B, and is about one and a half inches thick. This bed-plate A has cast or otherwise formed with it a hollow cylinder, B, as seen at Figs. 1, 2, and 3. On the end of this cylinder B I secure a hollow hub, P, which forms the hearing or journal for the main wheel 9 of the drum D, on which journal or arbor the wheel 9 revolves. The hollow cylinder B is ten anda half inches in diameter inside, and through this hollow cylinder I pass my main shaft 0. I make this shaft also hollow, and it, in turn, contains a hollow drill-rod, b. The shaft 0 has two bearings, c 0, one at each end. On the head of the shaft O, projecting over the forward end of the bed-plate A and hollow journal P, I secure the main driving-wheel h, which drives all the drills except the central one. Upon the periphery of the drum D, which I may denominate the circular cuttinghead, I mount, in the bearings e 0, any desirable number of hollow drill-rods, t, which rotate in the bearings or boxes 0 e, the forward boxes e serving also the purpose, as shown in Figs. 3 and 5, of securing together the edges of the plates f, which are made of iron or steel, one quarter of an inch thick, and about four feet in length, thus virtually extending forward the circular cutting-head to that extent and forming the drum D. The plates f are fastened at their rear end to the main wheel 9 of the drum, and the edges are, of course, sufficiently far apart to allow the rotation of the drill rods t. ()n the forward or outer end of the hollow drill-rods t are located the annular diamond drills or cutters d. Just forward of the main wheel g, and on the shaft O, as before mentioned, is secured the large drivinggear h, which is six feet six inches in diameter, and its cogs mesh with the cogs on the intermediate pinions t', mounted on short shafts which have their hearings in boxes j on the inside of the rim of wheel g. On the same shafts, immediately behing the pinions l, are secured other pinions h, of little larger diameter and finer cogs than pinions i, which mesh into the small pinion-wheels 3 on the drill-rods t, and through this train of gearing the drills are ro fated with the required speed. F represents a hinged segment of the cog-wheel h, and G represents a like segment of the main wheel 9 and drum D, arranged to swing up to enable the drum-head to be drawn back over the rail and debris truck; and when these segments are swung up the central drill a is drawn back. The segments are secured in place by screwplates 1. H represents the two engines for driving the machinery. The pistons are attached to the crankshafts on either side of the cylinder B, each carrying a bevel-gear, W, meshing into a like gear, -W,'on the rear end of the main shaft 0, andby this means the drill-driving wheel h is rotated. Immediately behind this gear W, and on same shaft, is a straight gear, L, of about one-half the diameter of W",

which meshes with a gear, L, secured to a shaft, I, mounted in bracket-bearings o tached to the top of cylinder B at either end. On the forward end of this shaft I is a small pinion, p, meshing with a gear, q, on the hub of the wheel 9, by which means the whole drumhead is rotated at the same time that the drills are being run. Mounted on this same shaft I, behind the gear L, is another gear, L, meshing, in turn, with a small gear, 1/, on the rear end of the rod or shaft 1) of the central drill a,

so that, it will be seen, the drum-head, the drills on its periphery, and the central or core drill are all driven at the same time and in the same direction, and the drills on the periphery, while revolving around their axes, are also traveling in the circle described by the revolution of the drum-head, thus cutting an annular groove, and the central drill-boring a central hole, which serves as the mine to receive the blasting agent. The central drillrod 1) passes through the hollow shaft 0, and extends through the center of the drum-head, and out to about the same plane as the drillrods on the periphery. In rear of the diamondpoint there is a loose collar, a, provided with a set-screw, I); this collar is slid back until it comes in contact with the hub of the main .drill gear-wheel h, where it is made fast upon the rod 1) by turning the set-screw I). The collar thus secured retains the drill-rod against retraction during the drilling operation, and

when it becomes necessary to swing up the segments F G, the collar'a is loosened and the drill-rod b drawn back out ofthe way. This hollow drill-rod may. be supplied with .water through a rubber connection at the rear 1 end. To the rear face of the wheel g, near its periphery is secured by metal loops a water- .pipe, c,'running around nearly the entire ex-'; tent of the wheel, beginning at the first drill, next to the beginning of the'segment G, and continuing to the last drill, before reaching joint is made which, while formin g a continuous pipe, will admit of the segment being swung up. In line with each and every drill-rodt v there is a short branch pipe and head, 12, which fits over the rear end of the drill-rods t, which are all hollow, as well as the drills. A radial pipe, as, extends from the pipe c to the hub of the wheel g, through which is a channel leading into and connecting with, the series of concentric grooyesin the face of the collar n, into which is conducted, from the rear side through a rubber hose, a small column of water under pressure; said water, while passing around the grooves 8, serves as a packing and lubricator before passing into the radial arm, to be thence distributed into the hollow drill-rods. Z, in the drawing, represents two fly-wheels on the shaft of engine to regulate the motion of the machinery. a r v The operation of the machine is as follows: A face on the stone having been made, I lay the rails and place the machine on the rails; I then start the engines which causes the drumhead of the machine to turn at the rate of one revolution a minute, for an eight-foot tunnel. At the same time the cutters, each and all, are revolved with a velocity of about eight hundred times that of the drum-head, each diamond-cutter taking away a portion of the stone, and the machine being moved forward by any feeding mechanism deemed best, an annular groove is cut in the rock about two inches wide. When this groove is cut to the depth of about two feet I back the machine on the track and charge the central hole made by the center drill with any blasting agent. I While the cutting process is going on a stream of wateris passing through all the cutters to prevent them from becoming hot, and at the same time washing out all small particles of stone from the groove. After the blast which throws out the entire pillar of rock, I clear away the debris on the truck shown at Fig. 9, and running in my machine, proceed as before, and so on.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is'

1. In combination with a cylindrical drumpose set forth. I g

3. The drum-head D and the drill-driving gear-wheel h, constructed with the swinging segments F G, as described, so as to beraised above the debris-truckwhen withdrawing the machine from the tunnel, as set forth.

4. The central core drill, constructed and arranged as described, so as to be drawn back when the segments are swung up, as set forth.

5. The drum-head, composed of the skeletonframe 1) and extension plates f, the latter secured together at their forward ends by the drill-rod boxes 6, and arranged to operate as and for the purpose set forth.

6. The drill-rods, made hollow as described, in combination with the gears h, i, la, and y, as and for the purposes set forth.

7. The water-lubricating channels 8 in the collar n, in combination with the channel through the hub of the drumhead, and waterdistributing pipe :0 v, as and for the purposes set forth.

ALLEXEY W. VON SCHMIDT.

Witnesses:

R. A. WIGGIN, J. H. VON SCHMIDT.

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