US1955081A - Stone surfacing machine - Google Patents

Description

April 17, 1934. J. J. MCCLYMONT 1,955,081

STONE SURFACING MACHINE Filed July 8, 1952 I INVENTOR .A Q61? ATTORNEY Patented Apr. 17, 1934 v UNITED STATES PATENT? OFFICE STONE SURFACING MACHINE Application July 8, 1932, Serial No. 621,373

2 Claims. (01. 51-126) The invention relates to stone surfacing machines and has for an object the provision of a machine having a rotatable table for supporting thereon a plurality of stones, and having a plu- 5 rality of movably mounted surfacing devices for successively subjecting the traveling stones to progressively finer grinding action for polishing the stones.

Another object of the invention is to provide a stone surfacing machine of this character in which the surfacing devices extend outwardly from a mounting adjacent the axis of the rotary table, thus permitting unobstructed access to the entire periphery of the table.

The invention further consists in the several features hereinafter set forth and more particularly defined by the annexed claims.

In the accompanying drawing, Fig. 1 is a side elevation of a stone surfacing machine embodying "20 the invention, parts thereof being shown in radial section, and

Fig. 2 is a sectional plan view thereof taken generally along the line 22 of Fig. 1.

In the drawing, designates a stationary column extending upwardly from a floor 11. A flat-topped stone supporting table 12 of annular shape surrounds the lower portion of the column 10 and is provided with a concentric circular track member 13 which is supported and guided on a series of spaced flanged rollers 14 mounted on brackets 15 fixed on the floor 11, thus supporting the table for rotation about a vertical axis. An internal ring gear 16 is secured to the inner edge portion of the table 12 and meshes with a pinion 17 secured to a vertical shaft 18 depending from a speed-reducing transmission 19 mounted on one side of the column 10, the lower end of the shaft being journalled in a bearing 20. The shaft 18 is driven through the transmission by an electric motor 21 to rotate the stone-supporting table at a very low rate of speed, which is preferably adjustable.

The circular track member 13 is secured to a number of radially extending I-beams 22 which are fastened to inner and outer flanged ring members 23 and 24 respectively. At their inner ends the I-beams are also secured to subjacent plates 25 having drain openings 26 which register with an annular drain trough 27 formed on the floor 11. Inclined drain plates 28 extend between the I-beams 22 from the outer edges of the table to the plates 25, and inclined barriers 29 are carried on the inner edge portions of the plates.

The rotary table is provided with a wooden platform including spaced wooden bars or planks 30 on which stones 31 are placed for surfacing. In some instances chock blocks 32 may be secured to the platform to prevent shifting of the stones. The spaces between the platform bars 30 permit drainage of the water and sludge during the surfacing operations.

A plurality of surfacing devices 33 are mounted above the rotary table for successively operating on each stone in its circular travel. In the present instance, three surfacing devices are provided, the first of which eifects'a gritting operation, the second a honing operation, and the third a polishing operation. The three surfacing devices are arranged 90 apart at B, C and D and the space preceding the first device is employed as a loading and unloading station, indicated at A.

Each surfacing device per se is of well known construction and includes a vertical shaft 34 which is journalled in bearings 35 secured to the column 10, the upper portion of the shaft carrying a pulley 36 driven by any suitable source of power, such as an electric motor 37. A bracket 38 is swingably mounted on the shaft 34 and is vertically adjustable thereon as usual. The

outer end of the bracket 38 carries a vertical shaft 39 on which another bracket 40 is swingably mounted. A vertical shaft 41 is journalled at the outer end of the bracket 40 and carries an axially movable grinding or surfacing head 42 at its lower end, the head being driven through a universal joint 43. The shafts 34 and 39 are provided with respective pulleys 43 and 44 connected by a belt 45, and the shafts 39 and 41 are provided with respective pulleys 46 and 47 connected by a belt 48. A pivotally mounted hand lever 49 is connected with the surfacing head for applying the grinding pressure, and for swinging the articulated frame. A control handle 50 is provided as usual for adjusting the elevation of the connected brackets 38 and 40. The shaft 41 is hollow and equipped with a Water connection 51 for supplying water to the grinding head.

In operation, the table 12 is set in rotation and a stone is placed on the table at the loading and unloading station A. When the stone reaches or approaches the position B, the workman coarsely grinds or grits the upper surface of the stone by means of the surfacing head 42, the latter being movable laterally in all directions. During the grinding operation Water is applied to stone and drains eventually into the trough 2'7. The articulated frame of the surfacing device has a long sweep permitting the grinding operation to continue as the table rotates through a considerable angle. During the gritting operation, another stone is placed on the table at the station A. When the gritting operation is completed, the gritted stone in like manner receives a honing operation at station C, the succeeding, stone being subjected to the gritting operation at station B and an incoming stone being loaded onto the table at station A. The stone finally receives a polishing operation at station D and is removed from the table at station A, following which another rough stone is placed on the table.

The adjacent surfacing devices have an overlapping range of movement so as to avoid any substantial interruption in the surfacing operations and to allow for variations in grinding time. Assuming that the grinding operations require equal intervals of time, then each surfacing device has a range corresponding approximately to 120 of table rotation, the time required for loading and unloading being relatively small. The overlapping range of movement of adjacent surfacing heads permits successive application of these heads to a stone on the table without requiring a shift in the position of the stone during the changeover, and without requiring the changeovers of the several surfacing heads to take place simultaneously.

What I claim as new and desire to secure by Letters Patent is:

1. In a stone surfacing machine, the combination of a table rotatable about a vertical axis and having an apertured upper surface adapted to support stones thereon, drainage collecting means carried on said table below its upper surface and having a discharge opening, an annular drain

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