US12431A - Charles-w - Google Patents

Description

UNITED STATES PATENT;

CHARLES. BROWN, OF BOSTON, MASSACHUSETTS; ASSIGNOR' TO'GEO. W. BANKEILAND GEO. O. CARPENTER.

PAINT-MILL.

To all w 750m it may, concern...

Beit known that I}, OHARLns' W. BRowN, of? Boston, in. the county of Suifolk: and State of Massachusetts, have invented certain. new and; useful. Improvements in Mills for Grinding Paint an a other Moist, Substances; and. I do.hereby declare that the following is a. full, clear, and exact description. of thesame, reference being had to the accompanying drawings, forming part. of this specification, in which Figure. 1,.is an elevation of. a-paint mill, having my improvements, Fig. 2,.isa vertical. section of the samewtaken nearlyat right angles to Fig. 1, but showsthe runner and spindle entire... Fig, 3, is a plan of the same. Fig,. 4c, is a. top view of the. lower stone. Fig. 5, is-an. elevation of thescra'per and: guardl withz a. section of-a portion of the trough, which. receives the ground paint.

Similar letters of, reference indicate-corresponding parts in the several figures.

The mill. which forms-the subject. of these improvements, consists of two: horizontal stones, of which the lower stone is therunner, andzis secured firmly tothe spindle, and the top stone is suspended above it. p

My first improvement consists in attaching the trough which receives the ground paint or material as it leaves the stones, to the running stone so that it may rotate therewith. The attachment of this trough to the running stone obviates thegreat difiiculty experienced in paint mills whose lower stone is the runner, of keeping the paint from running over the sides of the stone,

and setting between the stone and the curb surrounding it, where it soon makes a hard bed which produces great friction on the runner.

My second improvement consists in combining with the rotating paint trough, a fixed scraper and guards to cause the paint to flow over and out of said trough and into any suitable receptacle as will be described. To enable those skilled in the art tomake and use my invention, I will proceed to describe its construction and operation.

A, is a bed plate, upon and some distance above which, is supported by pillars B, B, a circular table C, of cast iron, upon opposite sides of which are erected two standards D, D. These standards receive and form guides for two vertical sliding rods, a, a, the lower parts of which are screwed and 12,431,. dated. February 20, 1855.

pass easily throughthe; table; (3,. above and below which they. are furnished: with nuts 71,6, by which they can. be adjusted and secured at'va rious: elevations. The-rods a, a, contain.- the bearingsto: receive the journals of two pivots b, b', which are attached diin the same manner? as; the m'ariners; com:

pass, and is free. to oscillate,- to a. limited.

extent, in any direction.

In order to, provide:- fon' a. considerable variation: in the. elevation: of the stone, 1 make in the rods (1,, a,-; several. bearings e, e, to receive the journals of the; pivots b, b.

The lower stone or runner'F,, rests. upon,

and issecuredi tov a1 flange f, on: the: spindle G, and stands a short. distance above the table G. The bottom of the spindle rests in: a step. bearing 9,, on the bed plate A, and works in aguide box It, secured to the table (3.. The height-of the-stone F, is fixed, and the faces of the stonesare adjusted; at.

th. proper distances apart, to; grind to the required. degree of fineness, by raising or lowering the rods a, a,.asmaybenecessary,

by means of the nuts 71, z. The suspension of the top stone by the adjustable rods a, a, enables another important duty to be performed in addition to the adjustment ofthe stones to grind at any desired degree of fineness, viz: the raising of the upper stone to admit air between the faces of the stones to cool them off quickly when they become heated, as they sometimes unavoidably will, during the grinding process. In grinding paint, this is very important, as the heating of the stones is highly injurious, if the grinding be continued, and to some kinds of paint, would be almost entirely destructive; and if no facility were aflorded for admitting air freely between the stones, the grinding operation would require tobe stopped a long time to enable them to cool every time they became heated, and much delay would be the consequence, but when the stones are separated to some distance apart, and plenty of air allowed to circulate between them, the time occupied in cooling will be short.

H, is the adjustable hopper, by which the paint mass is supplied to the mill stones to be ground. The throat j, of the hopper is of a depth a little greater than the thickness of the top stone, to the opening or eye, in the center of which it fits easily. A flange la, extends all around outside the top of the throat of the hopper, and in this flange are cut a number of female screws to receive a corresponding number of male screws Z, Z, which rest upon the top stone, and support the hopper. By turning the screws Z, Z, the hopper can be raised or lowered to increase or diminish the space between its bottom edges and the face of the runner F, and thus regulate the feed; or by allowing the hopper to come right down on the stone, the feed may be entirely stopped.

m, m, are the spiral blade feeders, such as are frequently attached to the sides of mill spindles, for the purpose of forcing the mass between the stones. Above these feeders m, m, is a spiral or twisted blade :11, which is soured to the top of the mill spindle and a little eccentric thereto. This feeder extends nearly, or quite, to the top of the hopper, and feeds the mass gradually down the hopper, and at the same time, opens the mass to admit air into and among it, which is very desirable.

N, is the trough which surrounds the lower stone, and receives the ground paint. Its bottom is nearly level with the top of the sides of the lower stone; and it is fitted closely to the stone all around and firmly secured, so that no paint can escape except at the proper point of discharge where it receives a fixed oblique scraper 0, which is secured to a fixed standard p, erected on the table C. This scraper fits to the interior of the trough, and nearly close to the side of the stone. To the same standard 79, are atrepresented in the drawing, for the purpose of preventing it from being thrown off by centrifugal force, as it is caused by the action of the scraper 0, to flow over the trough, and both serving to conduct it downwards to a spout to, cast on one side of the table C, down which it passes to any suitable receptable.

The mill spindle receives motion by level gearing from a horizontal driving shaft P.

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

1. Attaching the trough N, which receives the ground paint or material, to the running stone F, so that it may rotate therewith, for the purpose of obviating the ditficulty experienced in paint mills whose lower stone is the runner, of keeping the paint from running over the sides of the stone, and setting between the stone and the curb surrounding it, where .it soon makes a hard bed which produces great friction as set forth.

2. In combining with a paint trough rotating with the runner, a fixed scraper 0, and guards g, and r, to cause the paint to flow over and out of said trough, and be guided into any suitable receptacle, while the mill continues to run, substantially as described.

CHARLES W. BROWN. Witnesses:

O. D. MUNN,

J. W. HAMILTON.

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