US2420670A - Disintegrator screen - Google Patents

Description

May 20, 1947 c. w. LANrER I 2,420,670

DISINTEGRATOR SCREEN' Filed Feb. 23, 194:4 s sheets-sheet 1 C. W. LANTER DISINTEGRATOR SCREEN -May 20, 1947.

Filed Feb. 23, 1944 3 Sheets-Shee; 2

May 20, 1947. C, W LANTER 2,420,670

DISINTEGRATOR SCREEN Filed Feb. 23,' 1944 5 Sham-sheet s Patented May 20, 1947 DISINTEGRATOR SCREEN Clarence -WL Lanter, Du Page County,.I1l., assignor toBirtrnan Electric Company, ,ai corporation of Illinois.

Application February 23, 1944, Serial No. `523,513

(c1. zii- 865' 8 Claims'.

This invention relates to a disintegrator screen and to a disintegrator in which it is useful.

The ordinary disintegratorA screen is a. foraminous sheet of metal in which the perforations are separated. In the presentinvention the disintegrator screen comprises a web of material formed in the usual arced shape and provided with transverse slots instead ofperforations.

The device willlie-described*particularly in con-Y nection withv a disintegrator suchl as is shownin my co-pending applicationslSerial Nos. 502,754 and 502,755, ledAugust 17, 1943;

The invention is illustrated in the drawings in which Figure 1 is a front elevation partly insection of a disintegrator; Figure 2 is a side sectional elevation of a disintegrator; Figure 3 is a side View of the screen; Figure 4 is a section taken along the line 4--4 in Figure 3; Figure 5 is a section taken along the line 5-5 in Figure 3; Figure 6 is a section taken along the line 6-6 in Figure 5; and Figure '7 is a side View of a modied form of screen.

The rotor comprises a housing I0 consisting of a top housing II, and a bottom I2. Disintegration is accomplished by the hammer I4 rotated on the shaft I3 by a motor I5 at an extremely high rate of speed. The rotor is within a disintegrator chamber I6 and a screen II is mounted in the chamber about the path of the rotor or hammer.

The screen, as shown in Figure 7, preferably extends completely around the path of the hammer. In the form shown in Figure '7 the screen IIc consists of a web of metal bent to circular form and provided with a series of equally spaced transverse slots |80 extending entirely across the disintegrator chamber and substantially across the web I9 of metal. An unslotted edge portion 2l] is left at each edge of the screen and this portion projects into the groove 2| on the inner face of the grinding chamber and is supported by a circular shoulder 22 on the outer face. While this is illustrated as a groove, it may also be a shoulder against which the screen rests or against which it is held by its natural resilience.

It is preferred that the groove 2| have a width greater than the thickness of the screen so that the position of the screen with relation to the hammer may be adjusted. In Figure 2 the screen is shown as provided with an upstanding ange 23 which fits firmly against the inner edge of the groove.

The disintegrator includes a hopper having a hopper opening 3l in the top of the disintegrator, and material feeds from the hopper to the gate 2, 32 inside the rotor. Material is ground primarily in the disintegrating zone between the hammer faces 33-and'the screen I'I.

It has been found that the size of the openings may be determined-much more accurately by the use of slots rather than the ordinary'round openings,v since there is less wear upon the stamping instrument. Furthermore the average distance between openings may be greatly reduced, particularly by reduction of the maximum distance which a particle may travel without striking an opening. It is well known that the openings in the screen serve as grinding surfacesy and that the actual particles passing through the openings are very much smaller in diameter than the openings themselves. Therefore, the particles are struck either by the hammer faces or by the edges of the openings many times before being finally demolished into the proper size granules or particles. When slots are used, the effective cutting edge area is greatly increased in ratio to the total area of the openings, even though the total perimeter of the openings may be reduced. This is because the edges of the openings tend to shield themselves and to cause particles to glance off without getting far enough into the opening to produce a firm impact upon a sharp edge.

In the form of screen shown in Figure 3, the screen extends entirely around the hammer path but a portion thereof is provided with a nonperforated band 4I provided with `Crusher bars 42. These bars are welded to the surface of the screen.

In the form of screen shown in Figure 7, the screen I'lc is provided with slots I8c extending the entire circumference of the hammer path.

Figure 6 illustrates a form of screen in which the web opposite the striking face of the slot is slightly depressed. This may be accomplished in stamping, the upper surface of the web being inclined toward the slot. In this way a greater effective striking edge may be secured.

The foregoing detailed description has been given for clearance of understanding only, and no unnecessary limitations should be understood therefrom.

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

1. In a disintegrator, a shaft adapted to be rotated. a hammer mounted on the shaft, a housing defining a disintegrating chamber about the path of the hammer, said housing including a side wall adjacent the hammer, a substantially circular groove in the wall slightly outside the path of the hammer and having a substantial width, a light-Weight resilient disintegrator screen of sheet metal in ring form and having a thickness less than the Width of the groove, and a iiange upon one edge only of the screen of a height sufhcient to secure the screen in said groove, said screen being normally of slightly greater diameter than the mounting groove and held in said spaced relationship at least partially by the resiliency of the ring.

2. A disintegrator as set forth in claim 1, in

which the screen extends entirely about the pathA of the hammer.

3. A disintegrator as set forth in claim 1, in which the screen is provided with a series of transverse equally spaced slots.

4. A disintegrator as set forth in claim 1 Wherein said screen comprises a web having parallel transverse slots therein substantially at right angles to the direction of the movement of the disintegrator hammer.

5. A disintegrator as set forth in claim 1 Wherein said screen comprises a ring of metal provided throughout the major portion of its circumference with screening perforations.

6. A disintegrator as set forth in claim 1 Wherein said screen comprises a web having parallel transverse slots distributed at substantially equal intervals about the entire circumference of the screen.

7. A disintegrator as set forth in claim 1 wherein said flange is substantially at right angles to said screen.

8. In a disintegrator, a shaft adapted to be ro- Viiange upon one edge only of the screen of a height sufcient to secure the screen in said groove, the opposite edge of the screen being held in operative relationship by Contact with said removable side Wall, said screen being normally of slightly greater diameter than the mounting groove and held in said spaced relationship at least partially by the resiliency of the ring.

CLARENCE W. LANTER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 705,796 Sutoliffe July 29, 1902 1,634,026 Fritz June 28, 1927 658,288 Shaw et al Sept. 18, 1900 2,215,226 Meyer Sept. 17, 1940 739,227 Schutz Sept. 15, 1903 2,352,127 Sheldon June 20, 1944 1,704,757 Mead Jr Mar. 12, 1929

Images