US66716A - Francis l - Google Patents

Description

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TO ALL WHVOM IT MAY (JONCERN: i

u Be it known that I, FRANCIS L. KING, of the city and county of Worcester, and Commonwealth oi Massa chnsetts, have invented a new and improved Machine for Dressing Stone; and I hereby declare that the following is a full, clear, and exact description of the construction and operation ofthe saine, reference being had to the drawings annexed, which make a part of this specification- Fignre 1 being a side elevation of ainachine constructed after my invention.

Figure 2, an end elevation.

Figure 3, a section taken on the red line' A to B on tig. 2; and' Figure 4, a detached perspective view of the collars L on an enlarged scale.

A variety of' stone-dressing and polishing machines have heretofore been invented' having different combinations of motion in the upper and ncther stones, but few, if any, are found to produce uniformly perfect work, owing to the veins or spots of different degrees ci' hardness in most varieties of the material to be operated on.

The object of my invention, first, is to effect a more perfect combination of motions so as to preventany renndness in the face of the finished Work, as is almost certain to be the easlc'where the said surfaces have a reciprocating motion only; and it consists in combining a reciprocating bedi'or carrying the nether stone with one or more rotating vertical spindles for carrying the upper stones; also lin a novel construction of the.

bearings or `journals of said spindles, whereby they may have a' vertically sliding and at the same time a rotary motion, imparted to an ordinary square iron bar; and further, in providing that the lower journal of said spindle shall at alltimes be immediately above the carrying frames of the upper stones, whereby all lateral vibration Aand the convex grinding consequent thereon are prevented.

By the rotary motion I obtain a Alever power, and thereby materially diminish the motivetpower required, while at the same time7 by my combination ofthe two motions, Ivery materially increase the grinding capacity. To reduce the stone to a flat surface I must remove the rough or superuous parts. This must be done`by removing small particles at a time. By this combination of motion I apply to each of these particles a power which draws it in every direction almost at the same instant, thus literally twisting and rolling each particle from its position, and at the same time the upper as well as the under stones are dressed for use.

To enable others skilled in the art to make`and use my invention., I will describe its consti-notion and operation by referring to the drawings. I

The framing of my machine may be constructed in any convenient form and of suitable material, so arranged as to furnish journal bearing for the several operating parts. In a vertical position in the upper portion of this framing, in suitable bearings, is the main shaft T, carrying the master-wheel V, which gears into wheels M M on the vertical shafts K IQ which will be hereinafter more fully explained. Said master-wheel also gives motion to the drum D through a pinion on the vertical shaft b and belt c', or in any other convenient manner; or the train of motion may be in the reverse direction, the drum D receiving its motion primarily and communi-v cating motion to the shafts K by suitable intermediate gearing. The shafts K are supported in bearings N in the horizontal bars R R and S. These bearings are recessed on their upper sides to receive the collars L, and which rotate freely therein, said collars having an aperture corresponding with thc formation of the shafts K so that the latter may slide therethrough vertically whilst the collars rotate in their several bearings. Similar apertures are formed in the wheels INI M, so that the shafts K are free to'slide vertically without changing the position of lthe gearing o1' jourualsin the framing-bars R R, whilst the bar S is capable of rising or falling (with regard to the other portion of the framework) so Aa's to maintain a position as near as possiblel to and above the holders II, which carry the upper stones and thereby `prevent the vibration of the shaft K. The holders H are provided with set-screws I or clamps, which serve to secure the upper stone in theV desired position. O represents a hopper to supply sand, and P atube to convey water to the surface of the material operated on tc facilitate the grinding or polishing in the usual manner. In practice it might be found more convenient to arrange the gearing above the lower bars lli/,and to elevate the hopper O and tube P above the upper bars It.

The construction of the machine being thus described, its operation will be as follows: A block or series of blocks, G, of regular thickness being arranged von the carriage'O, and, if small, Vsecured together thereon by suitable clumps, and blceksF, secured by the setese'rews I in the centre of the holders H, a reciprocating motion is communicated to the carriage C, es before described, and e rotary motion `through the gear-Wheels M to the shafts K; thus a continuous rotary motion of the upper stone is produced in 'conta-ct with n reciprocating motion of the lower` stone, and u varying ongle of operntion on the projecting particles ini-opid succession Soon reduces the surfaces in contact to uperfect plane, the vertical motion ofthe shafts K through their bearings and through the eyes of. the propelling-wheels M compensating for the reduction of the surface or for thicker er thinner blocks of stone, whilst the sliding of the bars S keeps the lower bearing in close proximity to the holders H and prevents any vibration of the shafts K, es before described.

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

l. The self-adjusting, spindles K and their holders H, for rotating the upper stone, in combination with the reciprocating bed C for carrying the lower stone, when constructed, arranged, :ind operating substantially as set forth. A i Y 2. The combination of the boxes N and rotating collars L with the sliding spindles K, constructed and operating essentially as and for the purpose specified. i

3. The self-adjusting frame S, carrying the lower journalbox N L, in combination with' the spindles'K and holders H, operating substantially asend for'the purpose described.

' FRANCIS L..KING.

Witnesses H. 0.31011, FRANK W. PERRY.

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