US409869A

US409869A - Crusher for grinding-mills

Info

Publication number: US409869A
Authority: US
Publication date: 1889-08-27
Anticipated expiration: 1906-08-27

Description

(No Model") T. ROBERTS.

GRUSHBR FOR GRINDING MILLS.

No. 409,869. Patented Aug. 27, 1889.

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UNITED STATES PATENT OFFICE.

THOMAS ROBERTS, OF SPRINGFIELD, OHIO.

CRUSHER FOR GRINDING-MILLS.

SPECIFICATION forming part of Letters Patent N0. 409,869, dated August 27, 1889. Application filed February 1, 1888. Serial No. 262,625. (No model.)

To aZZ whom it may concern.-

Be it known that I, THOMAS ROBERTS, a citizen of the United States, residing at Springfield, in the countyof Clark and State of Ohio, have invented certain new and useful Improvements in- Crushers for Grinding-Mills; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to crushing and grind ing mills; and it consists in the improvements hereinafter set forth in the specification, and more particularly pointed out in the claims. I

In my improvement I use two crushers, placed one over the other, mounted upon parallel or substantially-parallel shafts and geared to run at unequal rates of speed. These crushers may be constructed with continuous spiral crushing-flanges, or with lugs set so as to convey the material crushed toward one end of the case. These crushers are separated by a plate which can be either fiXed or movable.

To accomplish the object of my invention more perfectly, the crushers are made to rotate in opposite directions, so that the material crushed may be first conveyed by the upper crusher toward the end of the case opposite the grinding devices and by the lower crusher toward the latter, the plate between the two crushers having a discharge-hole at or near the end opposite the grinding devices. The crushed material thus travels twice the length of the machine before reaching the b urrs. The side wall toward which the crusher moves and the bottom plate of the upper compartment form resisting-surfaces and approximate closely enough to crush the material coarsely before it enters the lower part of the case.

Figure 1 is a vertical longitudinal sectionof a crushing and grinding mill embodying my improvement. Fig. 2 is a cross-section through line 1 2.

The arrows seen in both figures indicate the direction of rotation of the crushers.

A is the upper portion of the case, which is made in hopper form, with its two opposite sides a a inclined inward and downward, as seen in Fig. 2, the upper crusher O being mounted on a horizontal shaft 0, journaled in bearings Z) I) at either end of the upper casesection A. The lower portion of the case A differs from the upper one in form, it being cylindrical in order to better conform to the operation of the lower crusher O, which is also mounted on a horizontal shaft c,parallel with the shaft 0 of the upper crusher O. \Vhen the crusher is connected with grinding devices, as represented in Fig. 1, the runningburr B is also mounted upon the same shaft 0' with the lower crusher.

The crusher-case is shown in two parts, bolted together through the projecting horizontal flanges (Z (Z. It may, however, be made in one piece, with a fixed or separable divisionplate between the crushers. In the views shown the two crushers are separated bya division-plateb, having ahole g therein,through which the crushed material from the upper section A of the case is discharged into the lower section A. This plate or partition may be cast on one or the other sections, or it may be separate and fitted between them.

In the views represented plate h is cast in one piece with the lower section A.

It will be noticed that the lower crusher extending into the burr-case leaves a space or opening at the opposite end under hole g, into which the crushed material from A may fall into the lower section A of the case, and from thence be carried forward to the grinding devices by crusher O. Two gear-Wheels h and h, connecting the shafts c and c, (on the right in Fig. 1,) give the requisite variable speed to the crushers O and O. burr-shaft 0 requires a much higher velocity than the shaft 0 of the upper crusher, the driving-pinion h is placed on the shaft 0'. The proportions of the two gear-wheels may be three or four to one or of any rate desired, according to the kind of material to be operated. upon.

In operating the crushers, the corn or other material is placed in the hopper or upper section A of the case, and is broken by the crusher 0 between its ribs e e and the side As the walls a a, after which it is discharged through the hole 9 into section A, and is further reduced by the crusher G. Directly in the Same Vertical plane with the shaft 0 in the bottom of case-section A are two deep grooves i 1', extending the whole length of the latter. These grooves are planed out or they may be cast in the case, as preferred. This section of the case is purposely made of greater thickness than the upper one to admit of these grooves being formed therein. The angles at the top of the side walls of the groovest' i operate in connection with the crusher C to crush and break up the material to the requisite fineness during its passage through case-section A to the burrs. One or more ribs have heretofore been form ed upon the inner wall of the crusher-case for this purpose; but as these ribs project from the wall they frequently become a source of danger in causing the crusher to become choked during its operation. ,This is especially so when crushing corn in a moist or wet state. As no portion projects from the inner wall of the case A ,all liability to choke is avoided. The crusher O is pivoted slightly below the axial line of the case-section A to facilitate the operation of reducing the material between its ribs 6 e and the angles 2" 11' of the grooves i.

I do not claim the form of crushers herein shown, nor do I desire to claim any particular form of crusher.

I claim as my invention 1. In a grinding-mill, acase formed with two compartments, situated one above the other, and oppositely-rotating crushers in said compartments, the lower of which crushers is so situatedas to leave a space between its end and the end of said case, in combination with a plate between said crushers serving to divide the case into its compartments, and having a discharge-opening in its end immediately above the space at the end of the lower crusher.

2. The combination, with a case having two compartments, situated one above the other, of a grinding or crushing roller in each of said compartments, the lower of which rollers has its ends located out of transverse vertical alignment with the ends of the upper roller, as shown, whereby one end of said lower roller will be in contact wit-h or near to one end of the case, and its opposite end will be sufliciently far away from the other end of the case to leave a space beneath the corresponding end of the upper roller, and aplate between said roller serving to divide the case into its compartments and formed with an opening above the space located at the end of the lower roller.

3. The combination, with a case having two compartments, situated one above the other, and a burr located at the end of the same and mounted upon a shaft passing through the lower compartment, of a grinding or crushing roller in each of said compartments running in opposite directions, the lower of which rollers is mounted upon the same shaft as said burr and has its ends located out of transverse vertical alignment with the ends of the upper roller, so as to have one end eX- tend nearly into contact with the burr, and its opposite end sufficiently far away from the end of the case to leave a space beneath the corresponding end of the upper roller, and a plate between the rollers serving to divide the case into its compartments and formed with an opening above the space beneath the end of the upper roller, for the purpose set forth. 4. The combination of a case having two compartments, situated one above the other, and formed on the bottom of the lower compartment with grooves or mortises, and a burr located at the end of said case and mounted on a shaft extending longitudinally through said lower compartment, and oppositely-rotatin g differently-speeded crushin g-conveyers in said compartments, the lower of which is mounted on the same shaft as said burr and has its ends located out of transverse vertical alignment with the ends of the upper crushing-conveyor, and a plate serving to divide the case into its compartments and having a discharge-opening in its end immediately above the space at the end of the lower crushing-conveyer.

In test imony whereof I affix my signature in presence of two witnesses.

, TIIOS. ROBERTS.

Vitnesses:

B. O. CONVERSE, A. E. ALDRICH.