US 1492102 A
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April 29 1924' N. NELSON GRINDING BEATER Filed Dec. 13 1920 NICOLAY NELSON, OF WAUKEGAN, ILLINOIS, ASSIGNO'B TO BLATCHFOBD CALIF HEAL COMPANY, OF WAUKEGAN, HILINOIS, A CORPORATION OF ILLINOIS.
Application filed December 1a, 1920. Serial nonsense.
To all whom it may cmwem:
Be it known that I, Nroonar NELSON, a citizen of the United States, residi at Waukegan, in the county of Lake and tate 5 of Illinois, have invented certain new and useful Im rovements in Grinding Beaters, of which t e following is a specification.
This invention relates to a machine for reducing to a fine even and soft product, all
kinds of grains, seed, screenings, hulls,
spices, etc., and the principal object of the invention is to deliver a uniformly ground product of any desired degree of fineness in one operation. The invention consists in the novel construction, combination and arrangenient of, the several parts.
In the accompanying drawing, Fig. 1 1s a sectional view of a machine constructed in accordance with the principles of this in- 90 vention as taken on the line 11 of Fig.
2 when it is inoperation; Fig. 2 is a sectional plan view of such a machlne taken on the line 2-2 of Fig. 1; and Figs. 3 and 4 show a pivoting means for the heaters.
5 In this invention the grinding is done in a circular chamber, the upper portion of which has serrated plates against which the material is forced by a plurality of swinging beater arms pivoted on a disk secured to 30 a rotatable shaft. A lower portion of the chamber is enclosed with a perforated screening, the size of the perforations de pending upon the fineness to which the material is to be reduced.
Referring now more drawing, the numeral 1 esignat'es (generally a base with upstandingl sides an with a central opening 2 at t e bottom through which the pulverized material is delivered. Hin d on a pivot 3 at one side of the top of tbb base is a cover 4 preferably semicircular in transverse section which has an opposite flange 5, with notches 6 therein by means of which it maybe bolted or otherwise fastened to the base at the side opposite the hinge. The stud bolts 7 may grqect u wardly from the base at this si e and t e flange 5 may be engaged in the ordinary manner by nuts 8.
Secured tothe inside of the cover 4 are articularly to the abplurality of curved pieces 9 which refery fit the inside cover, and are ormed with serrations or teeth. 10. These pieces 9 are preferably made removable separately: by being separately connected to the inside at right angles the rotation of each beater about of the cover by any suitable fastening de- V diameter as t e cover 4, and into these grooves a screen 13 is insertable from either end of the groove when the cover 4 is turnedback or open, and it is obvious that screens of diflerent fineness of mesh can be employed to insure that the material which gasses therethrough is of a predetermined;
egree of fineness.
t one end of the machine preferably adjacent the top of the cover 4 1s an inlet 14 for the material to be ground .which, after it passes 'throu h the beating and grinding operation is elivered through the icreegl 13 and through the opening 2 1n the ass Y A shaft 15 is mounted in bearings at the ends of the base 1 so that the cover will fit closely thereover at the ends of the base and attached to the shaft are a plurality of disks or -drums 16 and 17. These disks are spaced a slight distance apart, and mounted upon pintles or shafts 18 extending between the disks are grinding heaters 19. These heaters are re erably s acedan ual distance apart example, there may be four heaters ivoted apart at points one quarter of the istance around the disk. The heaters between the eration with respect to any longitudinal line of the cover.
tween eac pair of disks; for
In construction, each beater 19 preferably has a flat beating surface 20 at its forward side, that is, on the side which is foremost when the shaft 15 is rotated, and it is pivoted between two adjacent disks upon a flattened gprtion 21 which fits easily between the 'sks so that the beater is to rotate pin or shaft 18. Extending to the flat face 20, and'at a oint 'ust begond the periphery of the 'sks 1 is a s oulder 22 which engages the outer faces of the adjacent dis 1'? to 5-1:
upon its pivot of the shoulders 22 engage the peripheral face of the disks 17.
These heaters are preferably-in the form of a sector, and the outer peripheral edge is formed with serrations or teeth 23 extending lengthwise parallel to the shaft 15 and parallel to the serrations 10 of the cover plates 9. The teeth of the heaters are preferably inclined, as shown, while the teeth of the stationary plates 9 in the cover magnbe of equal length on each side.
other feature of great importance is that the distance from the pivot of each beater to the front peripheral angle thereof, designated by a in Fig. 1, is less than the distance from the pivot point to the rear peri heral angle designated by b. In other wor s, the heater is longer at the back than the front and the teeth 23 thereof are correspondingly graduated in distance from the front to the rear of each beater. Because of this fact, in the rotation of the grinding beater within the mill, a greater amount of material can occu y thes ace between the front angle of t e fgrin in beater and the serrated plates 0 the mi 1, than if the beater were a flat bar, thereby causing a constant gradual movementd of the matelpial in (the smaller space pro ucing a quic er in action.
In mounting the heaters b t iv ben he disks 16 and 17, the disks may be provided with perforations 24 which can be alined for the reception of short pivot pins 18 extending between. them, as shown in Fi 4.. In order to mount or remove one of t e beatersthe pivot pin is moved laterally into one of the disks 17, the beater 19 is slipped in place or removed in a well known manner, and the pivot pin is held'in place by means of a spring mng 25, also shown in Fig. 3 which extends beyond the periphery o is insertable through a per orat1on 26 in the ivot pin 18, like a cotter pin, the-ring re erably having one extremity 27 which is ent inwardly and the other extremity which lies close to the adjacent portion of the ring. This ring lies between the beater 19 and one of the disks 17 and referabl g the dis so it can be inserted and removed manually,
but cannot become loosened by accident because of the shape of the ring which will not permit disengagement from the pin except by manual means.
In operation, the material to be ground 18 introduced through the opening 14 and in the forward directionjas indicated by t e arrow in Flg. 1, it isfound that the material is first struck with the front face 20 of the menace grinding beater add is then thrown outward against the grindin plates 9 of the mill from whence it re ounds to the second grinding surface consisting of the teeth 23 of the beater, then back and forth between the grinding plate 9 and the toothed edge 23 of the beater, making repeated impacts gradually becoming quicker and shorter as the material approaches the rear end of. each beater unt l it escaped between the beater and the plate and 1s again engaged by the next beater. The rapidity of rotation, in order to secure the best results as found in actual practice must be relatively high and I have found that the machine operates very successfully at 3600 revolutions per minute with a drum or casing of about 20 inches diameter.
It is found in practice. that the teeth of the beater are subject to considerable wear when the heater is in operation, and it is contemplated that the face 20 as well as the outer toothed surface 23 may be made in sectional form or removable for replacement. Grinding teeth of different sha e may be used for different material or or grindin the same material to different deees o fineness. Instead of mounting the eaters upon pivots, as shown,beater disks may be provlded with outer surfaces corresponding to the toothed surfaces 23 arranged in varying distances from the center of the disk, but thus limiting the se arate pivotal mountingl of the heaters. is woul still preserve t e essential feature of the present construction b providing a heater with a grinding sur ace. It is obvious that other modifications maybe made in the construction, combination and ar-v rangement of the (parts without departing from the spirit an .With a construction of this kind it is found that any material can be reduced to the desired degree of fineness in the least possible time ue to the successive and repeated graduation of the beater impacts.
1. In a pulverizer, a pair of s aced disks having axial perforations whic may be alined, a pivot pin slidable axially therein and ion disks, a ater mounted upon the ivot pin between the disks, the pivot pin aving a transverse erforation, and insertable t rough the perforation of the pivot pin dis osed between the beater and one of the dis s and extending between the periphery of 'the disk for manual enga ment thereof to insert and remove t e spflnsrinp 2. n a i h speed centrifugal pulverlzing machine avmg a lateral inlet through which the material is drawn by the suction created by the. machine, the combination of an annular casing having transverse inscope of the invention.
a s rmg'wire.
wardly projecting serrations, a shaft through said casing and relatively short grindingbeaters pivotally mounted on said shaft, each of said heaters being made in substantially the form of a segment and having a flat radial forward beating surface and having transverse teeth on the peripheral surface, the arrangement being such that when the shaft is rotated at a high speed the material to be ground is first struck by the beater face and thrown against the serrations in the casing and is further acted upon by the teeth and serrations as it passes between the same.
3. In a machine of the character set forth, the combination of a casing having trans- &
verse teeth around the inner periphe a shaft through said casing and grin ing beaters pivotally secured to the shaft, said beater'being such length that a plurality thereof is required to extend the length of the casing, said heaters having flat front faces for throwing the material outwardly against the serrations and having transverse teeth in their outer surfaces and means for rotating the shaft and heaters whereby the material will be thrown from the faces of the heaters against the serrated casing and will then be thrown back and forth between the teeth and the serrations for pulverizing the same.