US38971A - Improvement in millstone-bushes - Google Patents

Description

J. F. McKRAY.

Millstone Bush.

Patented June 23, 1863.

Nirnn STATES v rines.

Aram

J. F. MGKRAY, OF HARIWIONSBURG, PENNSYLVANIA.

Specification forming part of Letters Patent No. 35,9 l, dated June 23, 1863.

To all whom it may concern:

Be it known that I, J. F. MGKRAY, of Ilarmonsburg, in the county of Crawford and State l of Pennsylvania, have inventeda new and Improved Millstone-Bush; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure l represents a side elevation of my invention. Fig. 2 is avertical central section of the same. Fig. 3 is a horizontal section of the same, the line x fr, Fig. l, indicating the plane of section. Fig. 4 is a similar section of the same, taken in the plane indicated by the line y y, Fig. 1. Fig. 5 is a modification of my invention as applied to a horizontal shaft. Fig. 6 is a transverse vertical section of the same.

Similar letters of reference in the several views indicate corresponding parts. A

The object-of this invention is to obtain a durable bush for the spindle of the bed-stone, one that will admit of a certain degree of adjustability, so as to conform in itself to the position of the spindle, one that will also insure a perfect lubrication of the spindle, and also protect the spindle from foreign substances that might otherwise work betweenA the collar and caps and produce unnecessary friction and wear.

My bush A is made of a cylindrical box, u, provided with projections or ribs, b, to afford a firm hold lo the stone. It is provided with a follower, B, fastened to it from below by means of screws c.

C is the spindle, the collar d of which is bturned off to a true taper, and a cap, D, of copper, or other suitable material, is fitted on the top of the spindle, being provided with a hole to fit the top or smallest part of the collar. This cap is designed to remain stationary, with the exception of the up-and-down motion produced by the movement of the spindle in raising and lowering the runner in grinding. In the sides of this meta-l cap are two notches or slots, e', cut to t onto pins e, projecting from the circumference of the main cap of the bush. These notches are cut at av slight angle to suit a stone running from left to right, or with the sun, and prevent the cap from rotating without interfering with its upand-down motion. The use of this copper cap is to prevent as far-as possible any dirt, grit, or grain from entering the bush and packing around the collar of the spindle. That portion of the collar of the spindle above the bush being turned tapering will keep the hole in the copper cap worn so as to perfectly fit the collar until it is worn to` the full size of the collar, when a new cap will have to be supplied.

E is the main cap, the top of which is provided with a tapering recess, f, for the reception of tallow, and inside of the cap is placed a disk or partition, g, for the purpose'of keeping the packing and tallow apart. An annular lip, h, on the inner surface of the cap, presses down on the center of the partitionplate, g, giving to it a dishing form, for the I purpose of conducting the tallow as it melts to the spindle. The cap E is retained in its place by notches h in its sides, which catch on pins h', projecting from the main part of the bush. Next below the cap E on the outside of the bush are three rings, t' j la, the two upper ones being put on loose, with the eX- ception of ablind fastening. (Indicatedin Fig. 2 of lthe drawings.) The lower ring of the three is to be cast solid with the bush, and is to be bedded into the stone any desired'depth below its face. The upper ring or collar, t, and the second ring or washer, j, are intended to ll up the space between the ring or rim k and the face of the' stone, and as the face of the stone wears down the washer can be taken out and the collar flet down. The rim l at the lower end of the bush is designed to strengthen the bush and to keep the plaster to its place when the bush is cemented into the eye of the stone. The inside of the bush. is provided with a liningof tin or other suitable material, put in tight and snug, but its edges are not soldered together, to give it a chance toA expand and tighten from the pressure of the packing. Secured to the inside of this lining are the tapering oil-cups m, running down to points nearly close to the follower, and placed so as to mismatch the tapering lugs a, projecting up from the follower. The oil-cups m serve the double purpose-first, to contain the oil, and, second, to

contract the space in which the packing isv contained as the distance recedes from the point of pressure. By these means thepressure on the packing is rendered uniform from one end of the bush to the other, and the tapering lugs n, projecting up from the follower, have the effect of crowding the packing to the journal as the screws are tightened up.

The paekingwhich use consists of ground corn-@obs and the raspings of Babbitt metal, together with metallic bars made of Babbitt or any other metal suitable for the bearings of mill-journals. This packing may also be used with advantage in a bush with two followers, o-sueh as represented in Figs. 5 and 6-and this bush may either be used for a horizontal or for a vertical shaft, and the oil may be admitted through a cap, p, and a small hole, which can be opened or stopped up by a pin with a tapering` point.

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

l. The application of the cap D, with oblique notches e, in combination with the tapering collar d of the spindle and with the main cap E ofthe bush, constructed and operating in the manner and for the purpose substantially as specified. p

2. The partition-plate g,in combination with the annular lip h, projecting from the inner surface of the cap E, as and for the purpose shown and described.

3. lhe tapering oil-cups m in the interior of the bush A, in combination with the packing and with the follower B, constructed and operating substantially as and for the purpose set forth.

J. F. MCKRAY. v

Witnesses:

H. L. RICHMOND, A. CLARK.

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