US138100A - Improvement in machines for dressing stone - Google Patents

Description

G. R. RAY.

I Machines for Dressing Shane. 1N6, 138,109, I A PatentedAprH22,l873.

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AM. PHOTO'LITHOEFMI'HIC ca mt (eseamvs's mums) UNITED STATES PATENT QFFIOE.

GEORGE 1t. BAY, OF BRIDGEPORT, CONNECTICUT.

IMPROVEMENT IN MACHINES FOR DRESSING STONE.

Specification forming part of Letters Patent No. 138,100, dated-April 22, 1873 application filed August 3, 1872.

To all whom it may concern:

Bridgeport, in the county of Fairfield and State of Connecticut, have invented a new and Improved Machine for Dressing Stone, of which the following is a specification:

My invention relates .to improvements in stone-dressing machines, in which steel or other cutters or chisels are mounted in a rotary cutter-head, which is mounted on a support on the ends of radial arms, by which it is adjusted vertically to the work which is automatically fed along under the cutters, and the said cutter-head is caused to traverse laterally on its support by a feedscrew, and the radial frame is adjusted vertically by screws geared with a worm-shaft for turning these said screws, and the worm-shaft being mounted on bearings so pivoted as to allow the screws to oscillate while working in nuts pivoted to the radial frame to admit of the-vibration of the screws necessary for the working of the radial frame. The invention consists in the improvement of machines for dressing stone, as hereinafter described and pointed out in the claim.

Figure 1 is a longitudinal sectional elevation of my improved machine taken on the line as w of Fig. 2. Fig. 2 is a plan view with some parts broken out. Fig. 3 is a side elevation of the cutter-head and section of one of the bearings. Fig. 4 is a transverse section of Fig. 3 on the line 3 3 Fig. 5 is a plan view of the water-discharging nozzles and section of the cutter-head, showing the relation of the said nozzles to the cutters. Fig. 6 is a side elevation of one of the tools and the adjusting collar.

Similar letters of reference indicate corresponding parts.

A is a platform of any suitable kind with a carriage, B, for feeding the stone slabs or blocks 0 along under the rotary cutting-chisels or tools D mounted in a rotary head, E, on the end of a radial frame, F, which is pivoted on the driving-shaft G at one end and supported near the other end on the adjustingscrews H, which are stepped in bearings I pivoted on the bed-frame at K, and carrying the worm-shaft L, which gears with the said screws by pinions M for turning them to raise or lower the frame F, being turned, by belts from the pulley N on the pulleys O P, one being crossed and both being slack, so as not to turn the worm L, except when brought into action by a tightener. The stone-carrying table is driven bya toothed bar, Q, pinion R, gears S T, and a belt from pulley U on the driving-shaft G. The cutter-head is turned by the square shaft V, pulley W, and abelt from. pulley X on the driving-shaft. The

journals c are mounted in bearings b, attached to a slide d, fitted on the way 6 at the head of the frame F to traverse the tools forward and back over the carriage by means of a feedscrew, f. This cutter-head is fitted snugly in these bearings, one at each end, for holding it firmly, to prevent any trembling or vibrating such as it would be subject to if mounted on a shaft with a bearing at each side of the frame F, and it has a central or axial square hole, through which the shaft V for turning it passes loosely, so that the cutter-head can slide freely while being turned by it. .A hood, 9!, is arranged over the cutter to cause a draft of air backward under the frame F to carry the dust away from the operator as much as possible. For securing the chisels or tools to the cutter-head, I have a wide or slotted hole, h, for each tool, covered at each end with a metal plate, 2' 70, let into the head flush with the surface. The. plate t has one hole to allow the chisel j to project through, and the plate K has two", holes, one for the tool and another for the screw -threaded end Z of a wedge, m, which, together with another wedge, n, confined between the two plates t k, fasten the tool by wedging it against one wall of the hole, said wedge m being caused to act on the other by a nut on its screw-threaded end being screwed up, thus clamping the tool throughout the whole length of the hole, so that it will not tremble or chatter.

A gage of any approved kind may be used in adjusting the cutting edges or ends of the tools to get them all the same distance from the axis, so they will all cut alike; but I prefer to have a loose collar, a, with a set-screw, b, (see Fig. 6,) to each tool, and have two or more sets of tools, so that one set can be suspended while another set is at work, and to adjust the collars on the tools so that when.

the tools are put in the cutter-head with the collars against the side, said tools will all be set alike, and after they are secured the collars willbe removed to be adjusted on another set of tools ready to put in when the dulled ones are removed.

To exclude the grit from the journals a and bearings therefor, the latter have an annular recess, 19, formed around the collar q next to the shoulder a"; and said collar is provided with one or more oblique scrapers, t, arranged to constantly scrape the grit which works in between the end of the bearings and shoulder r, away from the journal, together with the spent and gummy oil in a kind of paste, which keeps the joint closed and prevents the grit from working in through the said joints between the end of a bearing and the shoulder r. A represents a short pipe, with nozzles B mounted on the cutter-stock behind the cutter-head with a flexible pipe, 0, connecting it with a pump or other forcing apparatus for discharging jets of water under high pressure upon the stone to remove the chips and facilitate the action of the tools, particularly in dressing very hard granite. The said pipe A will be arranged in its supports so as to be oscillated so as to direct the jets to the tools,

as new and desire to secure by Letters Pat-' cut- 1. The cutters J, secured in the cutter-head by the plates z k, wedges m n, and the screwthreaded extension of one of the wedges and a nut, substantially as specified.

2. The arrangement of the annular space 1) in the bearings of the cutter-head, and the oblique scrapers t on the latter in said space to exclude the grit and dust, substantially as specified.

3. The combination of the water-pipe A, nozzles B, and a flexible pipe, 0, with the rotary chisels and the oscillating frame F arranged for discharging water-jets upon the stone where the tools act upon it, and at the same time, substantially as specified.

GEORGE ROBERT RAY.

Witnesses ELIPHALET B. STEvENs, SAMUEL TYNE.

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