US147490A - Improvement in polishing stone slabs - Google Patents

Description

J'. FINN.

Polishing Stone Slabs.

910,147,490 PafentedFeb.17,1s 74.

UNITED STATES PATENT OFFICE..

JAMES FINN, OF BOSTON, MASSA-XLHUSETTS IMPROVEMENT INA POLISHING STONE SLABS.

Specification forming part of Leiters Patent No. 147,490, dated February 17d, 1874 application iifed September 24, 1873.

To all whom z't/may concern:

VBe it known that I, JAMES FINN, of Boston, of the county of Suifolk and State of Massachusetts, have made or invented a new and useful invention or machine for preparing stones of either equal or diii'erent thicknesses, for being reduced or polished 5 and I do hereby declare the same to be fully described in the following specification and represented in the accompanying drawings, of which- Figure 1 denotes a top view, Fig. 2 a front elevation, Fig. 3 a vertical and longitudinal section, and Fig. '-.1- an end elevation, of the said machine.

The main essential features of the machine or invention consist in a rotary table and a frame for supporting such table, the table being providedwith clamps or devices for fastening to it a slab, for use in manner as hereinafter explained. The rotary table is pro-` vided with mechanism for revolving it, and it also has mechanism for varying its altitude. The carriage is to pass underneath the table, and from thence outward upon a railway to lead to a machine for grinding,polishing, or reducing the stones. y

In such drawings, A denotes the frame for supporting the main operative parts, there being arranged within such fra-nie a rotary table, B. 'This table is fixed at its middle upon a horizontal shaft, C, whose journals c 7) are supported in bearings in two connected levers, l) D', arranged at opposite ends of the frame A, and pivoted thereto. rlhe pivots or fulcrums of such levers are represented at b bin Figs. 1 and et. two levers I) 1) are connected by a ba-r, E, provided at its middle with a rocker screwnut, F, which receives a vertical screw,rG, so applied to the iioor H as to be capable of being revolved horizont-ally, but not of being moved vertically. The shank of the screw is provided with a "hand-wheel, c, to enable the screw to be turned by manual power, the same serving to move the table up or down, as occasion may require. On the outer journal of the shaft C there is fixed a worm-gear, d, which engages with a worm or screw, c, carried by a shaft, f. rIhis shaft is supported in two struts, g g, extended upward from the lever D. There is a crank-wheel, 71, on the outer end of the The longer arms of the shaftf. By revolving the said crank-wheel, the table may be turned or revolved in a vertical plane. Near the corners of the table, and to each of its opposite longer sides, there is extended up from the table two screws, i fe', upon which `are screwed clamp nuts or levers k 7c, such devices being for fastening a slab or plate, I, to the table, when arranged over it in manner as represented. Within the frame A, andupon the door on which it rests, and to extend from the said frame to a polishing or reducing machine, is a railway, K K., upon which is placed a wheel-carriage, L, capable of being run within the frame A and underneath the rotary table thereof. The top or platform l' of the railway-carriage L may be provided with a series of friction wheels or rollers, m m, arranged within and to project above it, in manner as shown in the drawings.

Fig. 5 denotes atop view, and Fig. 6 a longitudinal section, of a series of stones, a a '11, and their supporting-slab I, as arranged and connected through the agency of the abovedescribed machine. r

If we suppose we have a number of slabs or pieces, a, of marble, varying in their thickness, they are first to be placed edge to edge upon the top of the table, whereby their lower surfaces will be brought into one plane, Af ter this has been done, a mortar or a setting composition of plaster-of-paris and water is to be spread to sutiicient depth over the series of stones and between them, after which the slab I is-to be laid upon the composition or mass of plaster and brought into parallelism with the table, there being between the slab and the several stones a sufficient amount of the plaster to cement it to them, and compose, when the plaster may beset, a bed for each stone to rest in. The slab having thus been arranged, the lever-nuts of the table should be turned on their screws and down upon the slab, so as to confine it to the table. After the plaster may have become set, the table, by mea-ns of the mechanism for revolving it, is to'be turned over one hundred and eighty degrees, so as to bring the slab and the stones underneath it, and the slab underneath the stones. Next, the railway-carriage is to be run in underneath the slab, an d the table with the slab to be lowered until the slab may be deposited on the top of the carriage or the friction-Wheels thereof. Next, the fastening lever-nuts of the slab are to be turned back upon their screws, in order to release the slab from the table, after which the carriage with the slab on it, and with the stones to be reduced or polished resting on the slab, is to be run out from underneath the table and moved to the polishing or reducing` machine, to and upon-whose table the slab is subsequently to be moved from the carriage. The several stones to be reduced or polished Will then be above the slab, and have their upper faces in or about in one plane, and thus will be rmly held in place by the slab and the bed of plas ter upon it.

I claim as my invention as follows, viz:

The machine, substantially as and for the plnpose described, composed of the frame A, the rotary table B, and the mechanism for supporting and revolving,` the table and moving` it vertically, the said table being provided with devices for securing a slab to it, as set forth.

JAMES FINN.

Vv'itnesses R. H. EDDY, J. R. SNOW.

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