US2662247A - Briquetting roll assembly - Google Patents

Description

Bre. KLUGH r-:TAL

BRIQUETTING ROLL ASSEMBLY.

Dec. 15, 1953 4 Sheets-Sheet 2 Filed July 7, 1950 7 BETHUNE 6. (/Uf 5504,45 c. Perg/ME INVENTORS De 15, 1953 B. G. KLUGH ETAL.

BRIQUETTING ROLL ASSEMBLY 4 Sheets-Sheet 3 Filed July '7, 1950 BETHUNE Dec- 15, 1953 B. G. KLUGH rs1-Al. 2,662,247

y BRIQUETTING ROLL ASSEMBLY I Filed July 7, 1950 4 Sheets-Sheet 4 @gli EJ Bfr/MN: 6.4 06H (68 falfs clame/Ne INVENTORS Patented Dec. 15, 1953 2,662,247 BMQUETTING Roel essere? Bethune G. Klugh, Birmingham, and George C, Perrine, Anniston, Ala., assigners to Monsanto Chemical Company, Si, L9.Y

tion of Delaware lilo a erigere'.-

Application July 7, 1950, Serial No. 172,466

9 Claims. (Cl.

The present invention relates to improvements in roll briquetting presses and more particularly to ejectors for removing briquettes which fail to discharge therefrom by gravity in the normal operating cycle.

The conventional type of briquetting roll press in most common use is one having hemispherical, semi-cyclindrical or pyramidal depressions or pockets which are closely and regularly spaced over the peripheral faces of each of two coacting rolls so that the matched pockets at the compression surfaces continuously form Vbriquettes as the rolls are rotated in synchronism. In briquetting rolls of this type, one half of each briquette lies below the 'peripheral plain surface thereof and consequently the ejectors of the instant invention are not applicable thereto.

-In application Serial No. 100,628, filed June 22, 1949, in the name of the present applicants, a series of modified briquetting roll presses are described and/or illustrated. These presses yield briquettes which, after vpassing from their compression zone, have two full sides exposed, thus adapting them for removal by the ejector mechanisms hereinafter described.

In presses of the type referred to in the preceding paragraph, the material to -be briquetted is shaped in cavities, pockets, depressions orenclosures on the surfaces of Vthe rolls and when the resulting briquettes reach the proper position, they discharge by gravity from their respective pockets. However, it Vfrequently happens that when'the components of the mixture' to b'e briquetted are not properly proportioned, some of the briquettes adhere to their pockets and repass to the feed zone with the undesirable re sult of eliminating the briquetting action of the rolls in those areas filled with adhering briquettes and also of subjecting the rolls to excessive strain and undue wear at these points.

It is, therefore, the primary object of the instant invention to provide novel briquette ejecting means for use with the modified briquetting rolls above described, whereby 4the above undesirable results are completely eliminated. Another object of the invention is ,to Iprovide bri.- quette .ejectors in combination with thel foregoing rolls whereby the power cost involved the production of briquettes onsaid rolls is substan ,tially reduced.

yWith the foregoing land otherobjects lin view, .the present invention resides in the combina,- .lion and arrangementof ADarts and in .the de.- tails of construction, `hereinafter more fully def 2 scribed .and claimed, and .illustrated in the a9: companyllle drawings, in which l.Figure l ,is a front ,elevational view ,of a briquetting roll assembly embodying the filldelllldv ont .cam im@ k.of briqueiie ejector of the present invention- 2 is a yvertical sectional .View .of the bri: queuing .assembly of Figure l .taken .on .lille A .A

llieiir is a partial horizontal sectional new of the Vi9 i.iqiieiizi.,ne assembly of Figure .2 ,taken on lille .Bf-l3- Y Figure 4 is a ,from el oralifinal ries of .a bri- Qastiine roll assembly embodying the toothed Cammed elector `Aof .the resent ,invention- Figure 5 is a partial vertical sectional view 9 1' the brioueiis roll of Figure l and also y.a .front elevational .View of .the .slide bar carrying the nam follower rolls and the briquette ejector pins.

Fig-ure y6 is a side elevational .View o f the guanine .roll and the slide Abai of Figure 5 ,taken as indicated by ,the arrows Figure '7y is a horizontal sectional view taken on line D-D of Figure 5.

Figure 8 is Aan end or axial view of .a briquet: ting roll -showing the end one of a bank of spring plunger briquette ejectors in its operating position.

Figure y9 is a front elevational view vof a :hr1- quetting roll .partially in section showing the ejector pins in the out position, thatisfbean.- ingon the teeth Aof the roll.

Figure 10 is a view similar to Figure I.9, show..- ing vthe lejector pins in fin or .operating posi? tion.

Figure 11 is a front elevational rview of a bri.-4 quetting roll with associated springplunger briquette ejectors of modied .'design, the briquette roll being shown partiallyin section.

Figure 12 is a side elevational ,view taken on line E-.E of Figure 11. i

Referring to Figures 1-3 inclusive, reference character .l represents the spout for introducing the .briquetting feed into the .trough formed -by the tangential contacting of Zand 3;

:Roll .i2 has a series `of circumferentially arranged lV-shapecl grooves 4, :5, .6 and I .cut into its .surface `and also a series of longitudinal grooves 8 of similar ,shape and dimensions .distributed Laround vthe .entire .periphery o f ,the roll. The ,above grooves intersect -each other ,at light angles and form quadrilateral pyramids .in .geometrically arranged pattern as -shown v.in -Figfure 1.

.The longitudinal grooves retain vthe bri.-

the b'riquetting .rolls .J quettes since in the briquetting operation the pyramidal projections 4 on roll 3 occupy the space corresponding to the circumferential grooves 4, 5, 6 and 1 of roll 2.

Roll 2 is provided with a cylindrical cam groove 9 alignedwith the longitudinal grooves 8. The cam follower I moving in the above groove, as the roll rotates, causes the slide bar II to reciprocate.

The cam follower I0 is mounted on shaft I2 and the latter in turn is rigidly connected in any suitable manner to slide bar I I. In order to prevent distortion of the above shaft, a reinforcing plate I3 is welded at its bottom and top edges to the slide bar II and shaft I2 respectively, and on the opposite side of the slide bar I I and shaft I2 a similar reinforcing plate (not shown) is provided.

The slide bar II is slidably mounted in guides I2' and I3 which are attached to the press frame members I4 and I5, respectively, which in turn provide support for the roll bearings I6 and I1. These bearings carry the drive shaft I8a of thebriquetting roll 2.

A The slide bar II carries a series of briquette ejector pins I8 (one for each peripheral row of briquette pockets) which are adjustably mountedY so that their position with respect to the above briquetting roll may be varied as desired. This is accomplished by a series of set screws I9 which make it possible to rigidly secure the ejector pins I8 in their adjusted position.

Roll 3 is substantially identical in structure to briquetting roll 2 but dilfers therefrom in the following respect.

As indicated in Figure 3, roll 3 is equipped with an additional row of peripheral pyramidal proj ections, so as to provide lateral retaining walls for the briquettes formed in the outer peripheral rows of briquette pockets in roll 2. Moreover, since the outer rows of pyramidal projections in roll 2 are employed in providing lateral retaining walls for briquettes formed in the second and fifth peripheral rows of briquette pockets in roll 3, it is evident that the latter roll produces only four peripheral rows of briquettes. Except for the above difference, the cam groove, the briquetting surface and the method of mounting roll 3 'are identical to the corresponding features of roll 2.

Roll 3 is provided with a briquette ejector mechanism including a slide bar 2c, four briquette ejector pins 2| and a series of set screws 22 which permit adjustment of the position of the above pins with respect to the peripheral surface of the roll.Y The other elements of the ejector mechanism and the method of mounting and operating same are not shown since they are identical to the corresponding items illustrated and described in connection with the ejector mechanism for roll 2.

The briquette ejector mechanisms are shown located at a point directly below rolls 2 and 3, but the` invention is not limited thereto as their position may be varied widely so long as they do not impede the free flow of the dislodged briquettes. However, it is preferred to locate each ejector mechanism in a position within the lower outer quadrants of each roll.

, In the practice of the invention illustrated in Figures 1-3 inclusive, the charge to be briquetted is fed continuously to the briquetting rolls which are-synchronously rotated so as to provide efficient enclosing and compression surfaces for shaping the briquette feed. This results in the continuous formatzm of Luquettes in both rolls and as they continue to rotate, the cam follower IIJ moves in the cylindrical cam groove 9, thus causing the slide bar II to reciprocate. As soon as the briquetted material reaches the ejector mechanism, the slide bar II is moved to the right causing each ejector pin to dislodge a briquette from the adjacent peripheral row of briquettes. The further rotation of the rolls and the movement of the cam follower If) in the cam groove 9 effects the shifting of the slide bar Il to the left or to an inoperative position and allows the pyramidal projection to pass the ejector pin untouched. However, when the cam follower I6 moves again to the right in the cam groove, the slide bar I I is moved to the right to dislodge another series of briquettes in the manner described above. These operations are repeated over and over as long as the rolls operate and material to be briquetted is fed thereto.

The operation of the ejector mechanism for briquetting roll 3 is identical to that described above in connection with roll 2 and it is, therefore, unnecessary to repeat same.

It is evident from the above description of Figures` 1-3 that the outer peripheral rows of briquette pockets in roll 3 are not used in the continuous formation of briquettes on said roll and that it is not essential that the above rows be made discontinuous. Therefore, another embodiment of the invention involves the conversion of the above two peripheral rows of briquette pockets into continuous ridges of the same cross section encircling the roll.

The embodiment of the invention illustrated in Figures 1-3 is adapted for making briquettes on both rolls. However, it is also within the scope of the invention to form briquettes on only one roll. In such a modification, all of the peripheral rows of briquette pockets in roll 2 or 3 would be replaced by continuous ridges of the same cross section encircling the roll. Moreover, in the case of rolls with continuous peripheral ridges, the ejector mechanism would be omitted.

In the design described in the preceding paragraph, only one roll, namely, the longitudinally grooved one, need be driven and the other roll may float freely in the performance of its cooperating compression function.

As a further modification, instead of having the cam follower and cam groove on the same end of each roll as shown in Figures 1-3, they may be on one end of one roll and on the opposite end of the cooperating roll. Moreover, instead of being yon the left end of each roll, the cam follower and cam groove may be both located on the right end of each roll.

Referring to Figures 4-1 inclusive, reference character 23 represents a briquetting roll similar to the one shown in Figure l except that it is provided with four instead of five peripheral rows of briquette pockets 24. This roll is supported by a shaft 25 which is journalled in bearings 26 and 21.

Reference character 28 represents a bar slidably mounted in guides 29 and 30 which are attached to press frame members 3| and 32, respectively, which in turn provide support for roll bearings 26 and 21, respectively.

The above slide bar 28 is provided with two vertically mounted fixed or adjustable briquette ejector pins 33 and 3'4 and two studs 35 and 36 which are rigidly or adjustably supported at an angle corresponding to beveled surfaces at the ends Aof the Vbriquetting roll.

The studs 35 and 36 are constricted at their upper ends to provide bearings for cam follower rollers 37 and 38 respectively, which rollers are retained in position on the above bearings by means of nuts 39 and 48 respectively. These rollers 31 and 38 also serve as briquette ejectors.

The relative positions of the ejector pins 33 and 34 and the cam follower rollers 31 and 38 are clearly illustrated in Figures 6 and I'7.

As in the case of the embodiment illustrated in Figures 1-3 inclusive, briquetting roll 23 cooperates with a similarly constructed roll (not shown) except that the latter is provided with one additional row of peripheral pyramidal projections so as to provide lateral retaining Walls for the briquettes formed in the outer peripheral rows of briquette pockets in roll 23'. Furthermore, since the outer rows of pyramidal projections on the cooperating roll are employed in providing lateral retaining walls for the briquettes formed in the outer peripheral rows of briquette pockets of roll 23, it is obvious that the former produces only three peripheral rows of briquettes as compared with four peripheral rows on roll 23.

The structure of the ejector mechanism for the cooperating roll and the means for mounting same are similar to the corresponding items described in connection with roll 23, the only difference being that the former ejector mechanism contains one instead of two ejector pins.

The briquette ejector mechanisms may be located in any of the positions mentioned in the description of Figures l-3 inclusive, but it is preferred to locate each one in a position within the lower outer quadrant of each roll.

Referring particularly to Figures 4 and 5, it will be noted that cam follower roller 3'! is in a position for ejecting a briquette in the first peripheral row of briquette pockets in roll 23 whereas cam follower roller 38 is rolling upon the conical surface of the briquetting roll 23 and therefore is not in a briquette ejecting position. Moreover, at this stage of the revolution of roll 23, the briquette ejector pin 34 is in a -position for ejecting a briquette from the third peripheral row of briquette pockets while ejector pin 33 is to the right so as to pass between the second and third row of peripheral briquette pockets.

As the briquetting roll 23 rotates in the direction indicated by the arrow, the cam follower roller 31 moves upon the conical surface of the briquetting roll 23 and out of the position for ejecting a briquette from the first peripheral row of briquette pockets. This causes the slide bar 2.8 to be displaced to the left with theY result that ejector pin 34 is shifted out of the position for ejecti-ng a briquette from the third peripheral row of briquette pockets. While this is occurring, the cam follower roll 38 moves olf of the conical surface of briquetting roll 23 into a position for ejecting a briquette from the last peripheral row of briquette pockets. As this takes place, the slide bar 28 is moved to the left, thus moving the ejector pin 33 into a position for ejecting a briquette from the second peripheral row of briquette pockets.

The continued rotation of briquette roll 23 causes the cam follower roller 3l to move off of the conical surface of roll 23 into a position for ejecting a briquette from the first peripheral row of briquette pockets. Simultaneously therewith, the slide bar 28 is shifted to the right, thus displacing ejector pin 34 to a position for ejecting briquettes from the third peripheral row of briquette pockets.

The above operations are repeated over and over with the result that all of the briquettes are continuously ejected from the four peripheral rows of briquette pockets in roll 23. This eliminates any blind spots in the roll due to the filling up of the briquette pockets with adhering briquettes and also the resulting undue Wear and strain on the roll at these points.

The operation of the ejector mechanism for the cooperating roll is identical with that described in connection with roll 23 and hence further description is unnecessary.

Moreover, the ejector mechanisms of Figures 4-'7 inclusive may be used with the various briquetting roll combinations described in connection with Figures 1-3 inclusive.

Figures 8-10 inclusive illustrate another type of briquette ejecting device. 'I'his device comprises a plurality of slidably mounted plungers 4| retained in cylinder guides 42 which are carried by frame bar 43, the latter being rigidly attached at its ends in any suitable manner to the frame of the machine or press (not shown).

The upper ends of the cylinder guides 42 are provided with bushings 44 which serve as guides for the constricted sections 45 of plungers 4|. These constricted sections are threaded at their` ends to accommodate nuts 46 and 41 which are used to adjust the maximum outward travel of plungers 4| when ejecting a briquette.

The springs 48 continuously apply force against shoulders 49 and thus normally press plungers 4| outwardly against briquetting roll 50.

The above-described briquette ejecting device is placed in the same positions with respect to briquetting roll 58 as illustrated and described in connection with Figures 1-7 inclusive.

The briquetting roll 50 and the cooperating briquetting roll (not shown) are similar in structure to rolls 2 and 3 respectively of Figure 2.

It will be noted that the peripheral rows of briquette pockets 5| are interrupted by pyramidal projections 52 and that when the plungers 4| are not in a briquette ejecting position, they are forced by the action of springs 48 against the above projections in the manner illustrated in Figure 9. However, as soon as the roll 50 rotates further, the plungers move into a `position where they are projected into the briquette pockets 5|, thus dislodging the briquettes 53 therefrom. As the rotation of roll 50 continues. the plungers 4| are moved to an inoperative position by camming action of the pyramidal projections 52, the tapered portion 54 of the above plungers serving to facilitate the above operation. Thus, with the rotation of the roll 50, the plungers L4| are continuously forced into and .out of :briquette pockets v5| by the action of the coiled springs 48 and the camming action of the pyramidal projections 52 with the result that the briquettes are continuously removed from the above pockets as rapidly as they are formed therein.

The construction and operation of the ejector mechanism for the cooperating briquetting roll is the same as the corresponding items described in connection with roll 50, the .only diierence being in the number of plungers used in the ejector mechanism. Thus, for the reasons here, inbefore indicated in connection with Figures 1-7, the cooperating roll will have one less row of active peripheral briquette pockets and, therefore, it requires one less ejector pin or plunger.

The ejector mechanism of Figures 8-10 inche-4 sive may also be employed with the various briquetting roll combinations described in connection with Figures 1-3 inclusive.

Referring to the modied spring plunger type of briquette ejector illustrated in Figures 11 and 12, reference character 55 represents the housing for briquette ejector pins 56, l, 58 and 59, the beveled ends of which extend through openings 60 into contact with briquetting roll 5l. To the body of each of the ejector pins, there are welded or otherwise secured collars 62 which support, restrain or retain ball bearing assemblies 63. Coiled springs 64 encircling the ejector pins are located beneath the ball bearing assemblies 63, the above springs being supported at the bottom by recesses 65 in the top of tension adjusting plugs 66. The threaded adjusting plugs 66 are screwed into the bottom sections 61 and 68 of the housing 55.

The springs 64 apply pressure against the outer race 5S of the ball bearing assemblies 63, which pressure is transmitted to the under surface of collar 52, thus causing the ejector pins 56, 51, 58 and 59 to be normally forced out against the surface of the briquetting roll 6I. The tension on the springs 64 is adjusted by screwing the adjusting plugs 58 inwardly or outwardly.

A series of lugs 1S corresponding in number to the ejector pins are rigidly secured to the botl.

tom surface of the top of the housing 55. These lugs are recessed so as to accommodate coiled springs 'H which bear against the outer race E55 of ball bearing assemblies Q3. rhe springs 'il press against the ball bearing assemblies G3 and e thus exert lateral pressure against the ejector pins.

The lower ends of the ejector pins 5t, 5l', 58 and 59 have a diameter somewhat less than the bore of the adjusting plugs 5%. This arrangement is designed to permit the lateral movement of the above pins so that once they move to a briquette ejecting position, the coiled springs il can force them against the briquettes and thus dislodge same from the roll 6I.

The housing is supported by frame bar 'l2 which is secured at its ends in any suitable manner to the fixed frame (not shown) in which the briquetting roll 6i is mounted.

As shown in Figures l1 and i2, the ejector pins 56 and 58 are in a position for ejecting briquettes from the fifth and third peripheral rows of briquettc pockets, whereas pins 5i and 59 are each pressed laterally against a pyramidal projection in the fourth and second peripheral rows of briquette pockets in roll tl. As the roll El rotates, the pins 5% and 5t are moved by the camming action of the adjacent pyramidal projections to a position where they exert lateral pressure against a pyramidal projection in the fth and third row of briquette pockets. While this is taking place, the pins 51 and 59 move to a position where they are projected laterally against a briquette in the fourth and second peripheral rows of briquette pockets.

As the roll SI continues in its cycle of rotation, the pins 5E and 53 again move into a position for ejecting briquettes from the fifth and third peripheral rovs of briquette `pockets and simultaneously therewith the pins 5l and 59 move behind pyramidal projections and thus are placed in a position where they cannot eject briquettes.

The above operations are repeated with the continued rotation of the roll 6l and thus the briquettes are dislodged therefrom as rapidly asV they are formed.

The construction of the smaller cooperating briquette roll (not shown) is similar to that of roll 6I except that it contains one less peripheral rov.'Y of pyramidal projections. The reason for this is the same as that advanced in the description of the other embodiments of the invention.

The structure and operation of the ejector mechanism for the smaller cooperating roll and the means for mounting same are similar to the corresponding items described in connection with roll l, the only difference being that the ejector for the cooperating roll has ve instead of four ejector pins.

The position of the ejecting mechanisms with respect to roll 6I and the cooperating roll may be varied widely, but as in the case of the previously described embodiments of the instant invention, it is preferred to locate the ejector mechanisms in a position within the lower outer quadrant of each roll.

The ejector mechanism of Figures 11 and l2 may also be used with the various briquetting roll combinations described in detail in connection with Figures 1-3.

The above description has been confined to the Vuse of the illustrated ejector mechanisms in combination with briquetting rolls adapted to :form tetrahedral briquettes on one or both rolls. However, the invention is not restricted thereto as the above ejector mechanisms are applicable to all the briquetting roll assemblies described and/or illustrated in the above application, which produce briquettes in situ with exposed surfaces for the full depth of the briquettes or substantially so.

Moreover, the above description has been limited to mechanically operated briquette ejectors, but it is to be understood that the invention is much broader in scope. For example, the briquette ejector pins or plungers may be operated by pneumatic, hydraulic or electrical means.

it is evident from the foregoing description that the briquette ejectors of the instant invention provide a solution to the problem which accompanies the adherence of the briquettes to their respective pockets. However, this is not the only function performed by the above ejectors; they eiect a substantial reduction in the power consumption involved in the production of briquettes on the rolls with which they are employed.

For example, within the range of moisture required for satisfactory briquetting, the power consumption varies inversely with the moisture content of the material to be briquetted. With a hygroscopic water content of 10% by weight, a mxtureof nely divided plastic clay bearing phosphate ore and bituminous coal can be formed into sumciently strong stable briquettes for subsequent treatmont, but at such moisture content the briquettes tend to adhere to the inner surface of the briquette pocket and therefore fail to discharge therefrom by gravity. In such case, in order to produce briquettes which are not subject to the above disadvantage, it is necessary to reduce the hygroscopic water content to about 8% by weight or slightly thereunder. However, with this reduced water content, the power consumption has been found in practice to be over twice that with the higher water content described. Thus, with the ejector removing the naturally adhering briquettes having the higher water content, it is obvious that a great reduction in power consumption is thereby effected.

The application hereinbefore referred to is in- 9 corporated by rference in the present specification for the purpose of further illustrating the types of briquetting roll assemblies to which the instant invention is applicable.

It is to be understood that changes in the sise, form and construction of the various parts of our improved briquetting machine can be made and substituted for those herein shown and described, without departing from the spirit oi the invention, the scope of which is set forth in the appended claims.

We claim:

1. A briquetting roll assembly comprising in combination a pair of opposed contacting rolls which rotate in the same direction at the point of contact, each roll having uniformly spaced parallel V-shaped peripheral grooves and adjacent parallel peripheral ridges, at least one of said rolls having axial angular grooves intersecting said V-shaped peripheral grooves and peripheral angular ridges at right angles on said one roll and said peripheral ridges on the other rollk closely intermeshing with the peripheral grooves on said one roll at the point of contact of said rolls and providing lateral closures for the axial grooves on said one roll and thereby forming a series of completely separated mold cavities on said one roll; and an ejector means for laterally dislodging the adhering briquettes formed in said one roll, said ejector means being mounted adjacent to said one roll and being actuated at least in part by the rotary movement thereof.

2. A briquetting roll assembly comprising in combination a pair of opposed contacting rolls of substantially the same diameter which rotate in the same direction at the same or substantially the same peripheral speed at the point of contact, each roll having uniformly spaced parallel V- shaped peripheral grooves and adjacent parallel 4 peripheral ridges, at least one of said rolls having axial angular grooves intersecting said V-shaped peripheral grooves and peripheral angular ridges at right angles on said one roll and said peripheral ridges on the other roll closely intermeshing with the peripheral grooves on said one roll at the point lof contact of said rolls and providing lateral closures for the axial grooves on said one roll and thereby forming a series of completely separated mold cavities on said one roll; and an ejector means for laterally dislodging the adhering briquettes formed in said one roll, said ejector means being mounted adjacent to said one roll and being actuated at least in part by the rotary movement thereof.

3. A briquetting roll assembly comprising in combination a pair of opposed contacting rolls of substantially the same diameter which rotate in the same direction at the same or substantially the same peripheral speed at the point of contact, each roll having uniformly spaced parallel V- shaped peripheral grooves and adjacent parallel peripheral ridges, one of said rolls having axial angular grooves intersecting said V-shaped peripheral grooves and peripheral angular ridges at right angles on said one roll and said peripheral ridges on the other roll closely intermeshing with the peripheral grooves on said one roll at the point of contact of said rolls and providing lateral closures for the axial grooves on said one roll and thereby forming a series of completely separated mold cavities on said one roll; and an ejector means for laterally dislodging the adhering briquettes formed in said one roll, said ejector means being mounted adjacent to said lil one roll and being actuated at least in part by the rotary movement thereof.

4. A briquetting roll assembly comprising in combination a pair of similar opposed contacting rolls which rotate in the same direction and at the same peripheral speed at the point of contact, each roll having uniformly spaced parallel V- shaped peripheral grooves, adjacent parallel peripheral ridges and parallel axial angular grooves intersecting said V-shaped peripheral grooves and peripheral angular` ridges at right angles on each roll and said peripheral ridges on each roll closely intermeshing with the peripheral grooves on the other roll at the point of contact of said rolls and providing lateral closures for the axial grooves on said other roll and thereby forming a series of completely separated mold cavities on said other roll; and a briquette ejecting means for at least one of said rolls comprising a cylindrical cam groove aligned with the axial grooves on said one roll, a slide bar adjacent to said one roll carrying a series of briquette ejector pins and a cam follower roller which moves in said cylindrical cam groove, said cylindrical cam groove and said cam follower coacting with each other and the rotary movement of said one roll to alternately move said ejector pins into and out of the axial grooves in said one roll to dislodge the adhering briquettes formed therein.

5. A briquetting roll assembly comprising in combination a pair of similar opposed contacting rolls which rotate in the same direction and at the same peripheral speed at the point of contact, each roll having uniformly spaced parallel V- shaped peripheral grooves, adjacent parallel peripheral ridges and parallel axial angular grooves intersecting said V-shaped peripheral grooves and peripheral angular ridges at right angles on each roll and said peripheral ridges on each roll closely intermeshing with the peripheral grooves on the other roll at the point 0f contact of said rolls and providing lateral closures for the axial grooves on said other roll and thereby forming a series of completely separated mold cavities on said other roll; and a briquette ejecting means for at least one of said rolls comprising a slide bar carrying non-aligned cam follower rollers which alternately engage the conical surfaces and move v'into the axial grooves at the ends of said one roll and intermediate briquette ejector pins aligned with each of ysaid rollers which move into and out of said axial grooves in said one roll, said cam follower rollers coacting with said conical surfaces, said axial grooves and the rotary movement of said one roll to move said rollers and said aligned ejector pins into and out f said axial grooves in said one roll to dislodge the adhering briquettes formed therein.

6. A briquetting roll assembly comprising in combination a pair of similar opposed contacting rolls which rotate in the same direction and at the same peripheral speed at the point of contact, each roll having uniformly spaced parallel V- shaped peripheral grooves, adjacent parallel peripheral ridges and parallel axial angular grooves intersecting said V-shaped peripheral grooves and peripheral angular ridges at right angles on each roll and said peripheral ridges on each roll closely intermeshing with the peripheral gooves on the other roll at the point of contact of said rolls and providing lateral closures for the axial grooves on said other roll and thereby forming a series of completely separated mold cavities on said other roll; and a briquette ejecting means for at least one of said rolls comprising a series of aligned -wardly therefrom by the camming action of the peripheral ridges on said one roll.

7. A briquetting roll assembly comprising in combination a pair of similar opposed contacting rolls which rotate in the same direction and at the same peripheral speed at the point of contact, each roll having uniformly spaced parallel V- shaped peripheral grooves, adjacent parallel peripheral ridges and parallel axial angular grooves intersecting said V-shaped peripheral grooves and peripheral angular ridges at right angles on each roll and said peripheral ridges on each roll closely intermeshing with the peripheral grooves on the other roll at the point of contact of said rolls and providing lateral closures for the axial grooves on Said other roll and thereby forminga series of completely separated mold cavities on said other roll; and an ejecting means for at least one of said rolls comprising a xed frame bar carrying a plurality of substantially parallel rows of springactuated ejector pins which in their inoperative position are pressed against the angular peripheral ridges of said one roll and in their operative position are thrust into the axial grooves of said one roll, said ejector pins being alternately forced inwardly into the axial grooves of said one roll by the action of a spring and outwardly therefrom by the camming action of the angular peripheral ridges on said one roll.

8. A briquetting roll assembly comprising in combination a pair of similar opposed contacting rolls which rotate in the same direction and at the same peripheral speed at the point of contact, each roll having uniformly spaced parallel V- shaped peripheral grooves, adjacent parallel angular peripheral ridges and parallel axial V- shaped grooves intersecting said V-shaped peripheral grooves and peripheral angular ridges at right angles on each roll and said peripheral ridges on each roll closely intermeshing with the peripheral grooves on the other roll at the point of contact of said rolls and providing lateral closures for the axial grooves on said other roll and thereby forming a series of completely separated mold cavities on said other roll, said angular surfaces of said peripheral ridges on each roll terminating in a line lying in a plane defined by the outer periphery of each roll; and an ejector means for at least one roll for laterally dislodging the adhering briquettes formed therein, said ejector means being mounted adjacent to said one roll and being actuated at least in part by the rotary movement thereof.

9. A briquetting roll assembly comprising in combination a pair of similar opposed contacting rolls which rotate in the same direction and at the same peripheral speed at the point of contact, each roll having uniformly spaced parallel V- shaped peripheral grooves, adjacent parallel angular peripheral ridges and parallel axial angular grooves of trapezoidal cross vsection intersecting said V-shaped peripheral grooves and peripheral angular ridges at right angles on each roll and said peripheral ridges on each roll closely intermeshing with the peripheral grooves on the other roll at the point of contact of said rolls and providing lateral closures for the axial grooves on said other roll and thereby forming a series of completely separated mold cavities on said other roll; and an ejector means for at least one roll for laterally dislodging the adhering briquettes formed therein, said ejector means being mounted adjacent to said one roll and being actuated at least in part by the rotary movement thereof.

BETHUNE G. KLUGH. GEORGE C. PERRINE.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 196,100 Newell Oct. 16, 1877 708,574 Milne Sept. 9, 1902 1,345,208 Majewskir June 29, 1920 1,524,915 Debay Feb. 3, 1925 1,954,635 Leonard Apr. 10, 1934 1,986,365 Scholz Jan. 1, 1935 FOREIGN PATENTS Number Country Date 10,686 Great Britain 1889 418 Great Britain 1898 402,279 Great Britain Nov. 30, 1933 316,067 Germany Nov. 20, 1919

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