US464500A - Mill and power mechanism - Google Patents

Description

(Nol Model.)

E. C. GRIFFIN.

- MILL AND POWER MBGHANISM.

No. 464,500. Patented Dec. 8, 1891.

UNITED STATES 'PATENT OFFICE.

EDIVIN C. GRIFFIN, vOF IVEST NEWTON, MASSACHUSETTS.

MILL AND POWER MECHANISIVI.

SPECIFICATION forming part of Letters Patent No. 464,500, ,dated December 8, 18917 Application filed March 31, 1891i Serial No. 387,099. (No model.)

To all whom it may con/cern:

Be it known that I, EDWIN C. GRIFFIN, a citizen of the Dominion of Canada, residing at West Newton, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Mills and Power Mechanism; and I do hereby declare the following to be a full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it ap pertains to make and use the same.

' My invention relates, generally, to pulverizing-mills, and particularly to that class thereof in which the reduction or pulverization of ores and other substances is accomplished by the revolution of a roll or rolls within and against the inner surface of rings or annular dies, and in which said roll or rolls are held in contact with said rings or annular dies by centrifugal force when the mills are in operation; and it consists in the improvements in the construction, arrangement, and combination of parts disclosed in the following specification, and pointed out in the claims.

The objects of my invention are the production of a mill in which ores or other substances may be cheaply and rapidly crushed and pulverized or reduced to a powder, to effect the application of the power employed directly to the roll-shaft whereby the roll will be caused to positively rotate againstl the annular die, gyrate around the inner surface of the same, and by its rotary momentum and centrifugal force crush and pulverize the material between the same and saiddie, and to provide a method of doin gthis in which thepulley to which the power is applied is attached -rigidly and directly to the roll-shaft, and not,

as has heretofore been the case, by means of a universal joint or connection. These objects are accomplished by the mechanism illustrated in the accompanying drawings forming part of this specification, in which similar numerals of reference designate like This invention is an improvement on that for which Letters Patent of the United States were granted to James K. Griffin on August 2o, 1889, No. 409,579, ana relates particularly I to the means for supporting and operating the grinding-roll and roll-shaft shown and described in said patent, all as hereinafter described.

Referring to the drawing, the referencenumeral l designates the casing of the grinding-chamber, preferably formed in two separable parts arranged to be bolted together, as shown, and 2 the annular die located therein. This chamberor die, however, may be of any known or preferred constructiomiand constitutes no part of this invention, but is shown only for the purpose of illustrating the operation of theinvention claimed hereinavhich consists of the means employed forsupporting the roll-shaft 3 and grinding-roll 4 attached to said shaft, and for revolving the roll et around the inner surface of the annular die 2. At the top of the shell or casing 1 and preferably formed therein is a sphericalsocket 5,provided with a cover G, also having aspherical under surface, which is securely bolted, as shown, or otherwise secured to the casing or shell l. In the spherical socket 5, and kept from upward movement by the cover 6, is a ball 7, preferably provided with an elongated downwardly-extending portion 8. The top of this ball 7 is preferably partially fiat, as shown, and through the center thereof and the elongated portion 8 is formed a bearing or journal preferably provided with a bushing 9 of any desired anti-friction composition, and around the upper part of this journal in the ball 7 is formed a circular depression somewhat larger than the same, in which rests a thrust-ring or washer l0. Resting upon this thrustfring 10 and supporting 4the roll-shaft 3, which passes through the journal in the ball 7 is a pulley ll, preferably of wood and of the form shown. This pulley 1l is provided with a central metallic hub l2, through which passes the roll-shaft 3, and by which the pulley is rigidly secured to such shaft in any desired manner. This pulley ll is provided on its under surface with a central depression 13, and upon the lower portion of IOO its periphery with a driving-surface prefera` bly having grooves 14 for the reception of driving-ropes 15, as shown.

Through the top portion of the shaft 3 passes an oil-hole 16, adapted to register with corresponding holes or grooves 17 in the thrust-ring 10 and like holes 1S in the ball 7, by means of which the running parts of the device are kept thoroughly lubricated while running by the introduction of oil through the hole 16.

With the construction described, when the pulley 11 is revolved by means of the driving-ropes 15, or otherwise, rotary motion is thereby transmitted to the roll-shaft and to the grinding or pulverizing roll 4,attached thereto, and it will be'seen that therolbshaft beingsupported by the ball 7 has perfect freedom of movement at all times to swing in any desired direction without impeding or interfering with its lrotary motion, thedevice by which theshaft is supported constituting a perfect universal joint.

Itwill be seen, upon an examination of the drawing, that by constructing the pulley 11 inthe formshown and with the centraldepression 13 the center of the driving-face thereof and the center of the ball 7 Vare brought into thesame horizontal plane, and, although thedevice will Work when the driving-face of the` pulley is above or below the center of the ball 7, the best results are 0b-A taincd by the form of construction shown, the driving ropes or belt having then less tendency to interfere with the free oscillation of `the roll-shaft than when in any other position.

Although I `prefer to use a wheel :grooved, as shown, one provided with anges, oreven `perfectly plain, may be used; but upon a `plain wheel the belts have `a tendency to run off, and those with grooves or flanges are for that reason much to be preferred. It is evident that atoothed wheel or pulley, or Ea wheel driven by any device other than abelt or belts-may be substituted for thepulley 11 without-departing from the scope of `my invention.

Although I prefer to` havethe shaft 3 revolve'within the `ball 7, as well as the ball' 7 in the 'socket 5, it is evident that, if desired, the ball 7 may be rigidly secured to such `shaft? 3 and revolve therewith, or although capable of oscillation be made non-revoluble, 4and that instead of the form of universal joint herein described any other form thereof may be employed without departing from the Vscope of my invention, so far as it relates to the combined pulley and roll-shaftsupported by a universal joint, whereby the roll-shaft and roll attached thereto have perfect freedom to Swingin anydirection without impeding or interfering with the rotary movement thereof, and whereby when the pulley is revolved the roll-shaft and roll lare given a radial rotary movement, vand the rollshaft and roll are gyrated around the central axis of the mill, the roll being held in contact with the a conveyer y26.

annular die in the grinding-chamberwhen the mill is in operation by centrifugal force, and falling away from said die when the mill is not in operation by gravity.

The operation of the device is as follows: The material to be pulverized is introduced within the-grindingchamber by `means ofa spout 19 or in any other desired manner, and is taken up by the plows or stirrers 20, attached to the bottom of the roll 4, and is thrown against the` annular die 2, Where 1t 1s operated upon and crushed or ground bythe roll 4, and this'operation is repeated untllthe material has been reduced to the required degree of neness, when it is discharged through the screens 21 in the casing 1 into the annular lchamber 22 between the casing 1 `and the sheet-iron ncover 23, from which it passes Ainto a receptacle or hopper 24 by means of passages 25, formed in ythelannular base of the mill, from which it is `removed by The `operation of discharging the pulverizedmaterial through theiscreens- `2l may begreatlyfacilitated by fansor vanes (not-shown) attached to the `roll-shaft immediately above the roll in connection with the stirrers `or plows 20, as theyoperate to Vcause an increased circulationof air through the mill and force the air, togetherfwith the pulver-ized materia-l, out'throughft-he screens 21 into the chamber 22. Thevair` is drawn into the mill through the openings 27 inthe casing 1, and down through the-central hole 2S in thehorizontal partition 30, in which the Vshaft 3 revolves by the `stirrers or plows 20, and also by-the fans or vanes mentioned, when the'same are used, `which thus also operates tokeepall dust or pulverized material `within the mill. Thisrfeature of construction, however, constitutes no part of the invention claimed herein, `and the `fans or Avanesfare therefore not shown.

Itis evident that many changesand modivfications other than those mentioned may :be

made in the construction,combination, and arrangement o'f the variousfelements yof the invention described zherein `without fdeparting from the scope thereof, `and I do :not limit myself to theexact form shownyand it is also evident that the powermechanism, `consisting of the pulley "and the `shaft rigidly 'at tached thereto randsupported insucha man- `ner as to be free to'oscillate infall directions,

which constitutes the main feature of my `invention, is applicable to many uses other than that in connection with which itis here illustrated and described.

Having now fully described my invention, its construction, and operatiomwhatl claim, and desire to secure by Letters Patent; :is-

1. In a pulverizing-mill,"the'combintfion, with an annular die, of a roll-shafta/nd `roll `supported by a universal joint or fcoupling,

and a pulley mounted on the 'roll-shaft,snb stantially as shown and described.

2. In a pulverizing-mill, the combination, with an annular di'e, of a roll-shaft and roll IDO IIO

supportedby a universal joint orcoupling, and a pulley rigidly mounted on said shaft, whereby the shaft and roll may be rotated and the roll gyrated around the annular die, substantially as shown and described.

3. In a pulverizing-inill, the combination, with a frame or support, of a roll-shaft and roll, the roll-shaft and the frame or support being connected by a universal joint or coupling, and a pulley mounted on the shaft, substantially as shown and described.

4. The combination, in a pulverizing-mill having an annular die located in the grinding-chamber thereof, of a frame or support, a roll-shaft and roll, the shaft and the frame orvsupport being connected by a universal joint or coupling, and a pulley mounted on the shaft, substantially as shown and de' scribed.

5. A shaft supported by a universal joint or coupling and capable of being revolved and oscillated in all directions, in combination With a pulley rigidly secured to the shaft in such manner that the center of the driving-face thereof and the center of the universal joint are in the same plane, substantially as shown and described.

6. The combination, in a pulverizing-mill provided with a grinding-chamber having an annular die located therein, of a roll-shaft provided with a roll revolubly supported by a universal joint in such manner as to be capable of oscillation in all directions, and a driving-Wheel or pulley rigidly secured to the roll-shaft in such manner that the center of the driving-face of the .pulley and the center of the universal joint or coupling are in the same plane, substantially as shown and de'- scribed.

7. In a pulverizing-mill, the combination, with an annular die located in the grinding-v chamber thereof, of a roll-shaft provided with a roll, a ball through which the shaft passes, constituting a bearing and support for the same, supported in a socket above the grinding-chamber in such manner as to be capable of oscillationy in all directions, and a pulley secured to the roll-shaft above the ball, substantially as shown and described.

8. A shaft supported by a universalk joint or coupling and capable of being oscillated Ain all directions as Well as rotated, in combination with a pulley secured thereto having a central depression in the face thereof nearest the supporting universal joint, substantially as and for the purposes set forth.

Signed at the city and county of New York, in the State of New York, this 28th day of March, A. D. 1891.

EDVIN C. GRIFFIN.

Vitnesses:

J. P. GRIFFIN, C. L. DAVIS.

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