US396162A - Machine for polishing stones - Google Patents

Description

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M. HURTH.

MAGHINE FOR POLISHING STONES- Patented Jan.

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M. HURTH. MACHINE FOR POLISHING STONES. No. 396,162. Patented Jan. 15, 1889.

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PATENT MICHAEL HURTI-I, OF POUGHKEEPSIE, NEIV YORK.

MACHINE FOR PQLISHING STONES.

SPECIFICATION forming part of Letters Patent No. 396,162, dated January 15, 1889.

Application filed April 13, 1888. Serial No. 270,551. (No model.)

To all whom it may concern.-

Be it known that I, MICHAEL HURTH, of Poughkeepsie, Dutchess county, State of New York, have invented a new and Improved Machine for Polishing Stones, of which the following is a specification.

This invention relates to amachine for polishing slabs of marble, granite, or other stones. The machine is so constructed that the polishing-tool is automatically fed across the entire surface of the stone and is at the same time revolved during the polishing operation.

The invention consists in the various features of construction, more fully pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional side elevation of my improved machine. Fig. 2 a horizontal section on the line a: in, Fig. 1. Fig. 3 is a vertical longitudinal section of the machine through the center of crosshead b.

The letters a a represent the uprights of the frame of the machine joined on top bya crosspiece, a. The uprights a are grooved for the reception and guidance of a verticallymovable cross-head, b, suspended from the cross-piece a by means of the adj ustingscrew 0, by which the cross-head may be raised or lowered. (Zouliter-weights (Z, for relieving the screw c, are suspended by chains (1, that pass over pulleys d and are attached to the cross-head.

Through the cross-head 1) there pass two shafts, c, that project beneath the cross-head. One of these shafts should also project above the cross-head, to carry a fast pulley, 6, connected by belt 6 to fast pulley e on operating-crank e. The drawings show both shafts c to project above the cross-head and both provided with. a fast pulley. This enables the machine to be worked from either the right or'the left hand side. The lower exposed ends of shafts e carry rollers f, fast on the shafts, such rollers being surrounded by an endless belt or apron, g. Above the rollers there is placed a fixed oblong endless rack, 71, and a fixed oblong flange, i, as shown.

At their lower extremities the shafts e are journaled in a plate, 7, having a flange, In, similar to flange L. The rack h and flange L are secured to cross-head Z) by bolts Z I, while the plate j and flange are secured to the rack h by bolt Z, as shown in Fig. 3.

To the apron g there is secured, in suitable manner by straps or otherwise, a tube, m,-

through which passes a shaft, 01, the lower squared end of which is received by a socket, 0', of the polishing-tool o of suitable construction. This tool rests by gravity upon the slab A to be polished. The upper end of shaft 11 carries a gear-wheel, p, meshing in endless rack h. The tube at is surrounded by a pair of collars, q, having two pins or guides, 0, one at each side of the flanges i k. The pins or guides 7 project against the inner surfaces of the flanges i k, as shown, and their function is to hold the gear-wheelp in contact with rack h, even should the belt g become somewhat expanded by wear.

The operation of the device is as follows: By turning crank e the rollers f will be revolved to impart motion to the belt g. This belt will carry the tube m with it, and thus the tube will be made to travel in an oblong path, carrying the shaft 01 and tool 0 with it. At the same time the shaft a will be revolved by gear-wheel p, and thus the tool 0 will be revolved simultaneously while being carried over the slab. If a larger slab is to be polished, rollers f must be introduced, that are wider apart. For this purpose the cross-head Z) is perforated, as at b By withdrawing bolts Z Z the rollers f are removed and rollers wider apart may be put in place, the shafts of whichpass through the perforations U The object of making the cross-head b vertically adjustable is to permit the introduction of stones of different thicknesses.

What I claim is 1. The combination of a frame with a pair of rollers, a surrounding apron, a rack, a tube secured to said apron, a shaft passing through said tube and carrying a gear-wheel meshing into the rack, and a polishing-tool secured to the shaft, substantially as specified.

2. The combination of a frame with a pair of rollers, a surrounding apron, a rack, a pair of flanges, a tube secured to the apron and provided with a pair of guide-pins operating in conjunction with the flanges, and a toolcarrying shaft passing through the tube and in gear with the rack, snhslzmlinl tied.

.J. The combination of a frame with a vorl y as spooiand in gear with tho raolglzhe shaft carrying the polishing-tool, substantially as specified.

'1 Y )r\ ideally-adjnstable cross-head, a pair of rollers MTUIAEL 1 suspended l herofrom, nn apron surrounding \Vitnossos: said rollers, a rank, a lube mun-0d to said 1 V. l-ijnmsl ln, apron, and a shaft passing through said tube i HENRY E. OEDER

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