US2597548A - Frame structure for gyratory crushers - Google Patents

Description

May 20, 1952 s. w. TRAYLOR, JR 5 5 FRAME STRUCTURE FOR GYRATORY CRUSHERS Filed Feb. 10, 1948 10 Sheets-Sheet l by his A m/megs W W y 1952 s. w. TRAYLOR, JR 2,597,543

FRAME STRUCTURE FOR GYRATORY CRUSHERS Filed Feb. 10, 1948 10 Sheets-Sheet y 20, 1952 s. w TRAYLOR, JR 2,597,548

FRAME STRUCTURE FOR GYRATORY CRUSHERS Filed Feb. 10, 1948 10 Sheets-Sheet 3 May 20, 1952 s. w. TRAYLOR, JR

FRAME STRUCTURE FOR GYRATORY CRUSHERS I0 Sheets-Sheet 4 Filed Feb. 10, 1948 l l I i l l ""l" l L I I I ,1 1 I I I I I I I Ln m Inven70r+ 30ml W Wag 10M:

by was v fi'ornegs W W y 20, 1952 s. w. TRAYLOR, JR 2,597,548

FRAME STRUCTURE FOR GYRATORY CRUSHERS Filed Feb. 10, 1948 10 Sheets-Sheet 5 1? m M Ch I l m Ii ra m d] I m 7 i May 20, 1952 s. w. TRAYLOR, JR

FRAME STRUCTURE FOR GYRATORY CRUSHERS l0 Sheets-Sheet 6 Filed Feb. 10, 1948 May 20, 1952 s. w. TRAYLOR, JR

FRAME STRUCTURE FOR GYRATORY CRUSHERS l0 Sheets-Sheet '7 Filed Feb. 10, 1948 May 20, 1952 S. W. TRAYLOR, JR

FRAME STRUCTURE FOR GYRATORY CRUSHERS 10 Sheets-Sheet 8 Filed Feb. 10, 1948 DIG 17,

ldl' May 20, 1952 s w TRAYLOR, JR 2,597,548

FRAME STRUCTURE FOR GYRATORY CRUSHERS Filed Feb. 10, 1 948 10 Sheets-Sheet l0 Patented May 20, 1952 FRAME STRUCTURE FOR GYRATORY CRUSHERS Samuel W. Traylor, Jr., Allentown, Pa., assignor to Samuel W. Traylor, III, Allentown, Pa.

Application February 10, 1948, Serial No. 7,353

8 Claims. 1

This invention relates to new and useful improvements in crushers, and more particularly to improvements in crushers of the gyratory type.

One of the difficulties and objections encountered in prior crushers of the gyratory type has been the inability to provide an eccentric that will give long life under high loads. As is well known, a film of oil must be maintained between relatively rotating parts. Many eccentrics in this type of crusher fail to have a self-aligning feature in the eccentric with the result that the clearances between the moving parts have to be so great to allow for inaccuracies in machining and deflections that a proper oil film cannot be maintained, with the result that worn and burned out bearings occur more frequently than they should and both loss of time and added expense are entailed by operating shutdowns plus the cost of repairs and replacement parts. Another difficulty is presented by the provisions for effecting adjustment of the crushing surfaces as the result of wear or to change the fineness of the crushing operation. In many cases, and particularly in gyratory crushers of the so-called spider type, adjustment of the crushing surfaces is effected by vertical adjustment of the crusher shaft and head. In such cases the construction of the eccentric mounting of the shaft is made unduly complicated in order to provide for axial movement of the shaft, and feeding devices for the material to be crushed likewise become more complex and expensive.

Furthermore, gyratory crushers of the spider type characteristically have a comparatively small head motion and although these crushers ordinarily do not require a feeding device for the material to be crushed, there are many instances, such as, for example, in crushing stone to a fineness of less than about'one-half inch, where either a feeder device for the material or other object removed manually by burning with a torch. By retarding or delaying the return of the concave to its normal working position, the entrained tramp iron or other object is permitted to work its way readily through the crusher and be discharged therefrom. In addition, the delayed or retarded return of the concave to its normal working position cushions the shock or impact of this return action and prevents, or at least minimizes, the danger of injury or damage to the machine. 7

With the foregoing in mind, one of the important objects of the present invention is to provide a novel eccentric bearing and mounting construction for the shaft of a gyratory crusher wherein the eccentric bearing is supported for limited rocking movement so that it is selfaligmng with the shaft according to fluctuations thereof.

Another object of the invention is to provide a novel eccentric bearing and mounting con-,

struction for gyratory crushers wherein the eccentric bearing member is rotatable relativeqto the crusher shaft.

Another object of the invention is to provide a novel eccentric bearing and mounting construction as set forth wherein it is entirely. possible at all times to maintain adequate and proper lubrication of the assembly.

Another important object of the invention is to provide in a gyratory crusher of the present type, novel means for effecting vertical adjustment of the crushing surfaces relative to each other.

Another object of the invention is to provide novel means for adjusting the crushing surfaces of a gyratory crusher relativeto each other must be employed or a smaller throw eccentric provided for the crusher shaft. A change of eccentrics entails considerable loss of time and expense so that the provision of an adequate feed device for crushers of this type is desirable. Furthermore, it is necessary in these crushers to provide for the displacement of the concave to permit discharge of uncrushable objects, for example, tramp iron, such as a sledge hammer head, drill bit, dipper tooth or the like, without I through vertical adjustment of the concaves as distinguished from adjustment of the crusher shaft and head.

Another object of the invention is to provide a novel construction and arrangement of parts for effecting vertical adjustment of the crusher concaves which is relatively simplified and which can be manipulated to effect an adjustment of the crushing surfaces without disturbing the crusher shaft and its mountings or any other component mechanism of the machine.

Another important object of the present invention is to provide a novel feed device for Another object of the inventionis to provide anovel feed device for gyratory crushers having the features and characteristics set forth which is quite simplified in construction and is entirely effective and efficient in operation and use.

A further important object of the present invention is to provide, in a gyratory crusher having yielding means permitting displacement of the crushing bowl or concave when an uncrushable object is encountered, novel means for retarding and cushioning the return of the concave to its normal operating position, whereby dis- 3 charge of the uncrushable object from between the crushing surfaces is efiected and reseating of the parts with substantial impact and shock is prevented or minimized.

These and other objects of the invention, and

the various features and details of the construction and operation thereof, are hereinafter fully set forth and described with reference to the accompanying drawings, in which:

Fig. 1 is a sectional view vertically through a gyratorycrusher embodying the present invention taken on line l--l, Fig. 2;

Fig. 2 is a sectional view taken on line 22, Fig. 1;

Fig. 3 is a sectional view taken on line 33, Fig. 1;

Fig. 4 is a detached view in perspective of an upper frame and spider member of the crusher;

Fig. 5 is a perspective view partially in section of a sleeve or ring member which is supported by :2

the frame of the crusher and mounted for adjustment vertically with respect thereto;

Fig. 6 is an enlarged sectional view of the sccentric mounting of the crusher shaft;

Fig. '7 is a sectional view taken on line 1-1, :1.

Fig. 6;

Fig. 8 is a fragmentary view from line 8-8, Fig. 6;

Fig. 9 is a perspective view partially in section of a novel bearing construction embodied in the eccentric mounting for the crusher shaft;

Fig. 10' is a perspective view partially in section of a housing member which receives the bearing of Fig. 9;

Fig. 11 is a view in perspective of a rocker member which is provided in association with the bearing of Fig. 9 to effect self-aligning thereof.

Figs. 12, 13 and 14 are elevational and plan views, respectively, of a rocker member which is provided in the bearing of Fig. 9 and operates to effect self-alignment of the bearing according to movements of the crusher shaft;

. Fig. 15 is an enlarged detached view in section showing details of construction and arrangement of parts embodied in novel means provided for retarding return to operative position of the crushing concaves following the release thereof to permit foreign material, such as tramp iron, to pass through the apparatus;

Figs. 16, 17, 18 and 19, respectively, are detached perspective views showing the construction and arrangement of certain of the component parts of the retarding mechanism of Fig. 15;

Fig. 20 is an enlarged fragmentary sectional view of the upper end of the crusher shaft showing the support therefor and novel means for feedingmaterial to the crusher; V

Fig. 21 is a view similar to Fig. 6 showing a modifldeccentric bearing construction;

, Fig. 22 is a slightly reduced sectional view on line 22 22, Fig. 21; and

Fig. 23 is a developed View, in reduced scale, of

4 the bearing member embodied in the construction of Fig. 21.

Referring now to the drawings and more particularly to Fig. 1 thereof, a crusher of gyratory type made according to the present invention may comprise a lower or base frame section generally designated 10, including a central sleeve or hub portion II and an outer ring portion [2 integrally joined together, for example, by means of a plurality of circumferentially spaced legs i3 arranged, for example, as shown in Fig. 3. The ring portion ii of the lower frame I0 is provided at its upper edge with a laterally projecting continuous flange portion M on which is seated the lower flange portion I5 of an upper frame and spider section which is generally designated l6, and constructed, for example, as shown in Fig. 4 of the drawings. Preferably, the upper frame spider section [6 is bolted to the lower frame section [0 as indicated at H.

Extending radially inward from the annular wall portion 3 of the upper frame section l6, at predetermined spaced intervals thereabout, is a plurality of spider legs l9 which terminate at their inner ends in a centrally disposed housing portion 20 of generally cup-shape having an opening 2| in its bottom portion for the upper end of a crusher shaft 22, which carries the usual crusher head 23. Seated within the housing 20, and surrounding the upper end of the shaft 22-, is an annular member 24 having a spherical upper surface portion 25 on which rests the corresponding spherical surface 26 of a member or nut 21 that is threaded upon the upper end of the crusher shaft 22 as shown. By this construction it is to be observed that the entire weight of the shaft 22 and the crusher head 23 is carried by and suspended from the upper frame section and the nut 21 may be adjusted to predeterminedly set the position of the crusher head 23.

The lower end of the crusher shaft 22 is co: centrically supported in the central hub portion ll of the lower frame section It and a gyratory motion is imparted to the shaft 22 in the wellknown manner. As previously stated, the conventional type eccentric mountings heretofore utilized for the shafts of gyratory crushers have been objectionable due to the fact that the amount of clearance that was required for the flexure of the shaft and inaccuracies of machining, usually made it impossible to maintain an oil film between the relatively moving parts of the cocentric assembly and hence these mountings were not properly lubricated. In addition, in conventional type eccentrics as used heretofore. the alignment of the inner and outer bearings is fixed so that the inner bearing cannot adjust itself to the slight misalignments of the shaft when the crusher is under load.

According to the present invention there is provided a novel eccentric mounting for the lower end of the crusher shaft 22 which is not subject 'to the foregoing objections and difficulties and which has the distinct advantage of being selfaligning. Thus, with reference to Figs. 6 to 13, inclusive, of the drawings, the lower end of the crusher shaft 22 is journ aled in an eccentric bearing 30 which is in turn received within a housing 3! that is rotatably mounted in a suitable concentric journal 32 mounted internally of the central hub portion ll of the lower frame section In of the crusher. The lower end of the housing 3| rests upon a fiat bearing 32a and is shouldered. as indicated at 33. Secured upon this shoulder 33 of the housing is a bevel ring gear 34 which is driven from another bevel gear 35 that is fixed on the inner end of a radially extending shaft 36. The shaft 36 is rotatably journaled in bearings 31 supported in a sleeve 38 disposed within a housing portion 39 of the lower main frame section [9. The shaft 35 extends outwardly of the crusher and has a pulley or the like 40 for a drive belt secured on its extremity.

The housing 3i is rotationally driven at a preselected speed from the pulley 40 through the described gearing, and it is to be noted that the upper end of the housing 35 is provided with a slot 4| in which is engaged a projection or lug 42 on the eccentric bearing 3!! (Fig. 9) so that the latter rotates with the housing 3| and relative to the crusher shaft 22. The bearing 38 is internally babbitted as indicated at 43 at the load receiving side thereof, and the housing 3| likewise is exteriorly babbitted in a corresponding area as indicated at 44.

In order that the eccentric bearing 35 will be selfaligning with respect to the shaft 22 and permit limited rocking movement of the hearing within and relative to the housing 3 I, there is interposed between the bearing 30 and the housing 3|, at the load or thrust side of said shaft, a rocker member 45 constructed and configurated as shown in Figs. 11, 12, 13 and 14 of the drawings. As shown in the drawings, the rocker member 45 has an outer surface 45a which is curved to conform to the inner wall surface of the housing 3| and has an inner surface 452) which is longitudinally convex and transversely flat. The inner surface 45b of the rocker 45 seats against a correspondingly configurated surface 47 provided on the eccentric bearing 39, and the thickness of the rocker member 45 is such that its outer surface 45a projects beyond the external surface of the bearing 30 and engages the adjacent inner surface of the housing 3| in a manner to maintain a small clearance between the housing 3| and the eccentric bearing 30 so that the only contact of the bearing at this point with the housing is through the rocker member 45. By this construction the eccentric bearing member 30 is free to tilt vertically and slide horizontally upon the inner surface 45b of the rocker member 45 and ample clearance is provided between the housing and bearing to provide for limited displacement of the latter according to any misalignment of the shaft 22.

According to the present invention the crushing bowl or concaves 55 which cooperate with the head 23 are carried by an annular backing member or ring having the cross-sectional shape and configuration shown in Fig. 1 of the drawings. As shown, this backing ring 5| is provided in its undersurface with a triangular recess or groove 52 arranged for seating engagement upon an.inwardly inclined continuous annular flange portion 53 formed internally of an annular flange portion 53 formed internally of an annular sleeve or wall member 54, the said backing ring being held against rotation relative to the member 54 by a projection 54a on the latter which engages a slot 5m in said ring. The member 54 is mounted in association with the crusher main frame sections I5 and I5, respectively, and is adapted to be adjustable vertically with respect thereto for the purpose of adjusting the crushing bowl or concaves 55 relative to the head 23.

The construction and arrangement of the sleeve or wall member 54 is best shown in Fig. 5 oi the drawings. Projecting vertically downward from the lower edge of the member 54 at equally spaced intervals circumferentially thereof is a plurality of lugs 55 which are received in slots '56 (see Figs. 1 and 3) of corresponding size and shape arranged circumferentially of the lower frame section In in the flange portion l4 thereof outwardly of the wall portion 12 thereof. In addition, vertical slots 51 corresponding in number and spacing to the spider legs I9 of the upper frame section [6 are provided in the member 54 for reception of the said spider legs l9, and

these vertical slots 51 extend downwardly from the upper edge of the member 54 and have their lower ends beveled or inclined as indicated at 58 in correspondence with the shaping of the ex tremities of the spider legs l9.

As previously stated herein the member 54 is adapted to be adjusted vertically with respect to the main frame sections In and I6 of the crusher to effect an adjustment of the concaves 50 relative to the head 23. To this end the outwardly facing surfaces of the depending lugs 55 of the member 54 are threaded as indicated at 60 and the upper end portion of the said member likewise is similarly threaded as indicated at 6 I. In engagement with the threads 55 of the depending lugs 55 of member 54 is a split ring nut 62 which is arranged at the underside of the flange portion 54 of the lower main frame section 10, for example, as shown in Fig. 1 of the drawings, and similarly engaged with the threads 6| provided on the upper edge portion of the member 54 is a ring nut 53 which is adapted to abut upon the flanged upper edge of the frame section It.

By this construction and arrangement it will be apparent that through adjustment of the ring nuts 52 and 63, respectively, the position of the member 54 vertically with respect to the main frame sections at and It can be varied, thus making it possible to effect adjustment of the crushing bowl or concaves 50 relative to the crusher head 23 without the necessity of vertically adjusting the crusher shaft and head assembly. When the member .54 has been properly positioned vertically with respect to the main frame sections it and it as described, any relative lateral play or other movement between the member 54 and upper frame section I5 is eliminated by tightening a plurality of bolts 65 providedradially in the frame section I6 at predetermined intervals circumferentially thereof and arranged to engage against pressure plates 56 which are seated in recesses Bl in the frame 15 and contact the outer surface of the member 54.

Secured upon the upper end of the member 54, for example, by suitable bolts 70, is an annular top plate H having at its inner circumferential edge a depending flange portion 12 arranged concentrically of the spider housing portion 20 and providing lateral support for the skirt portion is of a feed hopper i4. Threaded vertically in suitable bosses 15 provided circumferentially of the top plate 7 i, corresponding to the spacing of the upper frame section spider. legs l9, are bolts 16 which are arranged to engage downwardly into I tight engagement upon suitable seat portions 18 provided on the upper edges of the aforesaid legs [9 thereby providing additional hold-down of the upper frame section it.

According to the present invention, the backing ring member 5! which carries the concave or crusher bowl 59 normally is held in firm seating engagement upon the inwardly inclined fiange portion 53 of the member 54 by means of a plurality of relatively stiff coil springs that are 7 interposed and react between the aforesaid ring 5| and the under-surface oi the top plate 1 I.

As is well understood in the art, during the epcration of a crusher of the type with which the present invention is concerned the head 23 is given a gyratory movement around the axis a: as indicated by line y with the result that the surface of the head approaches toward and retreats from the working surface of the concave 55 along a circular pattern. In the event that non-crush able objects of greater size than the minimum opening at which the crusher is set enters betwee'n the crushing surfaces, excessive crushing strains normally would be transmitted from the head 23 to the concave 50 but, in accordance with the present invention, these strains are relieved by the yielding of springs 80 above the portion of such an object with the result that the concave 50 and the backing member 5| tilt upwardly above the diametrically opposite point as a pivot until the object has worked its way through the crushing zone whereupon the springs 88 reseat the backing ring 51 upon the inwardly inclined flange portion 53 of the vertically adjustable member.

In'order to facilitate the passage of non-crushable material between the crushing surfaces and also to prevent reseating of the parts described above with substantial impact or shock which might damage or injure certain elements of the machine, there is associated with certain of said springs 80 a mechanism or means for retarding the return of the concave 50 and its backin 5| to their normal working position upon the flange 53 of the member 54.

With reference more particularly to Figs. to 19, inclusive, of the drawings, a rod 8| extends coaxially within each of the coil springs 80 and has its lower end loosely secured to the backing ring 51, for example, by means of a nut 82 threaded on the lower end of said rod as shown. Each of the rods 8| extends vertically upward through an opening 83 in the top plate "H and into anhydraulic cylinder 84. The lower end of the cylinder 84 is provided with a spherical portion 85 which is supported in a corresponding recess or seat 86 provided in the bossed portion I la of the annular top plate "H. The spherical portion 85 of the cylinder 84 is retained in seating engagement with the recess 86 by means of a retaining ring or the like 81 secured to the top plate H, for example, by :bolts 83 and provided with internal surface portions 89 of spherical section arranged to engage the cylinder spherical surface 85. By this construction and arrangement of parts it will. be observed that the cylinder 84 is afforded substantially a universal mounting with respect to annular top plate H.

The upper end of the rod Bl extends entirely through the cylinder 84 and secured upon its upper end, for example, by means of nuts 99, is the sleeve portion 9| of a piston member 92 which is .slidably disposed within a chamber 93 provided internally of the cylinder 84. The cylinder chamber 93 is closed at its upper end by a cylinder head 94 and the joint between the latter and the piston sleeve 9| is prevented from leaking by packing 95 secured in place and retained by a gland 96 that is secured endwise of the cylinder head 94 as shown. Interpos ed between the piston sleeve SI and the rod 8| is thi'ri tube 91 which extends from the extreme lower end of the cylinde 3 4 upwardly to a point above the cylinder head 94 so that oil or other liquid within the cylinder chamber 93 will not leak downwardly along the rod M and out, of the cylinder 84. I r I as shown in Fig. 19 of the drawings, the piston 92 is provided with openings or passages J00 therethrough of substantial area arranged circurnferentially of the piston. These openings Hill are normally closed against the passage, 6f on from one side or the piston 92 to the other by means o'f'a yal've ring lfll disposed beneath the piston and normally retained in closing relation with respect to the passages Hill by means of coil springs or the like I02 acting between the underside of the valve ring I 0| and a washer 0 3 retained on the lower end of a stem I04 by 'a hut or the like I05, the said stem I04 extending vertically upward through openings Hi6 and H11 in the valve ring and piston, respectively, and having' a head portion I08 at its upper end which rests upon the upper face of the piston 92; I The valve ring IEJI, in addition to the openings MB for the stems I84, is provided with a bleed opening Hi9 disposed in register with one of the relatively large piston passages l0!) and operable to permit oil or other liquid to bleed therethroug h from the lower side of the piston 92 to the upper side thereof under certain operating conditions of the piston. I

Suppose now that a piece of uncrushable ma terial, such as a piece of tramp iron, is encountered between the crushing surfaces and is too large to pass through the crusher in the ordinary operation of the apparatus. AS the crusher head 23 moves toward the piece of tramp iron the concave ring 5!) and its paclging member 55 are forced upwardly from its seat on the inclined flange 53 and against the downward pressure provided by the springs 80. This up"- ward movement of the concave ring and its baching member causes the rod 8| likewise to be forced upwardly through the tube 97 and relative to the cylinder 84 carrying with it the piston 92. As the piston 92 moves upwardly, oil or other liquid which is contained in the cylinder chamber 93 1s forced downwardly through the large ports I05 with sufhjcient force toopen the valve ring [5| against its springs I 2 thereby causing a relatively free and rapid flow of oil or other liquid from the upper side of piston 92 to the lower side thereof.

When the piece of tramp iron or other un crushable material has been passed throughthe crusher, and the concave ring 50 and its peeking member 5! are thus free to reseat upon the flange 53, downward movement of the piston 92 in the cylinder 8'4 is retarded by the oil therein and, since the valve plate it! will be moved into closing relation with the large piston passages [00 by virtue of both the valve springs lilzand the upward pressure of the oil in the cylinder, the only passage of oil that can take place from the lower side of the piston 92 to the upper side thereof is through the small bleed port It!!! that is provided in the valve plate IDI. Hence down-- ward movement of the piston 92 an'dthe rod 8! is materially retarded so that the ackme em: her 5! is precluded from reseating upon the in wardly inclined flange portion 53 of the member 5-. with sufiicient impact or shock to cause damage or injury tothe machine.

The type of gyratory crusher with which the present invention is concerned has comparatively small head motion and although it does not ordinarily require a feeder for the stone to be crushed, in order to make the finer sizes of stone, say of a size about one-half inch and less, either a still smaller throw of the head 23 is required or a feeder device must be employed to feed just enough stone to the crusher so that it will not become choked or overloaded. Accordingly, the present invention contemplates the provision, in gyratory crushers of the type described, of a feeder device which is operable automatically by the gyratory oscillations of the crusher head shaft 22.

With reference more particularly to Fig. 20 of the drawings, an annular sleeve or collar H2 is secured, for example, by bolts III, to the upper edge of the housin 20 of the upper main frame section I6 from which the crusher shaft 22 and head assembly 23 is suspended, in the manner previously described. The upper end face H2 of the crusher shaft 22 is a flat plane surface which lies perpendicular to the true longitudinal axis of the said shaft, and has its center displaced or offset laterally from the vertical axis x of the machine. Seated upon this plane end face H2 of the shaft 22 is the conical end face H3 of a feeder shaft II which likewise has its center or apex offset from the axis x and coincident with the center of the shaft face I I2. The feeder shaft H4 is supported in operative position upon the flat face I I2 of the crusher shaft 22 by means of an annular wearing ring H5, of bronze or other suitable metal, having an internal spherical surface portion I I6 disposed in bearing contact with a corresponding spherical surface provided on the enlarged end portion I I! of said feeder shaft I It. The wearing ring H5 is retained in its proper relation with respect to the feeder shaft II 5 by means of a cap H3 which is threaded internally of the annular collar H and locked in its proper adjusted position therein with respect to the wear ring H by means of a lock ring H9 threaded externally on the'cap H8 into abutting engagement-with the upper face of the annular collar or flange H0. A flat spring I22, for example, of

the well-known Bellfield type, is interposed between the wearing ring H5 and the cap I t8 and provides a certain degree of resiliency between these members.

Secured upon the feeder shaft I It adjacent the upper end thereof is a cap or ring I2I of generally spherical configuration having a depending peripheral flange portion I22 which slidably seats upon the upper spherical surface I23 of the cap I I8 and thereby precludes dust from entering interiorly of the feeder mechanism through the feeder shaft opening I22 in said cap. The space lying inwardly of the cap flange I22 between the cap I2I and the top spherical surface of the cap IIB preferably is filled with grease to provide lubrication for the moving contact surfaces of said members. Secured upon the upper end of the feeder shaft H4 is a plate I25 to which is bolted a feed table or the like I23.

It is to be noted, with reference to Fig. 20 of the drawings, since the lower end surface of the feeder shaft H4 is of conical configuration, that the feeder shaft I I4 engages the shaft 22 of the crusher at an angle and the contact between the ends of the crusher shaft 22 and said feeder shaft is a straight line which lies radially from the apex of the conical end surface H3 of the feeder shaft. Thus the center of the oscillatory motion of the feeder mechanism will be at a point designateda at the intersection of the true vertical axis a: of the machine and the angularly displaced axis a of the feeder shaft H 'I. By reason ofthe construction and arrangement described, and since the contacting end faces of the shafts 22 and H4 have their centers laterally offset or displaced with respect to the machine axis a: as set forth, it will be apparent when the shaft 22 is caused to gyrate about said axis x as indicated by line y, that gyratory movement of the shaft 22 will impart a gyratory movement to the feeder shaft H5 whereby the latter is caused to move about the axis a: as indicated by line a.

With respect to the center of gyration a of the feeder shaft I I2, it will be observed that the distance between the center of the upper end face I I2 of the crusher shaft 22 and the feeder shaft 'gyration center a will govern the extent or degree of gyration of the feeder shaft, and by varying the construction of the feeder shaft H4 to provide a spherical surface portion having its center closer to the upper end face of thecrusher shaft 2-2,'the gyratory motion of the feeder shaft H4 will be magnified or increased, whereas by constructing the feeder shaft so that its center of gyration is spaced at a greater distance from the end face of the crusher shaft 22, the extent of gyration of the feeder shaft I It may be decreased. Furthermore, it is pointed out that the center of gyration of the feeder shaft I M may be arranged below the crusher shaft end face H2 in which event the same degree of gyratory movement of the feeder shaft H2 would take place but in an opposite angular relation with respect to the shaft 22 from that shown in Fig. 17 of the drawings. The feed table i2 8 is shown in the drawings in the position desirable for feeding relatively coarse material to the crusher and for feeding relatively finely divided materials to the crusher this table may be secured to the plate I25 in the inverted position shown in dotted lines in said Fig. 20.

A modified form of the eccentric bearing con+ struction for the lower end of the crusher shaft 22 is shown in Figs. 21, 22 and 23 of the drawings. As in the case of the eccentric bearing construction previously described herein, this hearing assembly comprises the housing 3i, which is rotationally journalled in a bearing 32 mounted in the central hub portion II of the lower main frame section Ill, arranged to receive therein an eccentric bearing generally designated I30 which receives the lower end of the crusher shaft 22 in the manner previously described.

In accordance with this modified construction of the eccentric bearing assembly, the bearing I30 comprises a fixed generally semi-circular filler section I31 which is secured internally of the housing 3 I, for example, by rivets I32, and a movable section I33 which embodies novel features of construction and arrangement whereby said section is afforded limited rocking movement about both horizontal and Vertical axes in order that it may align itself with the shaft 22 according to slight fluctuations and misalignments thereof.

The section I33 of the bearing I36 is arranged at the load side of the shaft 22 and. rocking movement of this section relative to its housing 3| is afforded by a rocker member or insert I34 constructed as shown and described with reference to Figs. 11, 12, 13 and 14 of the drawings, and also by slightly rounded or convex opposite end and bottom faces provided on the rocker section I33 as shown in the developed view of said section illustrated in Fig. 23 of the drawings. These rounded or concave end and bottom faces of the bearing section I33 allow the said section limited rocking movement upon the rocker member I34 so that the bearing is free to align itself with the shaft 22.

It is to be noted, as in the case of the bearing constructionof' Fig.6, thatgthe eccentric bearing |3llis: adapted to rotate. relative to the shaftv 22 and is keyed or. secured tojthehousing 3| for rotation therewith by meanstof the. aforesaid rivets on securing means. 132, the; housing 3| being rotationally driven. inthe manner previously described; through its associated. gear 34. and:- the ear 35.

While certain, embodiments ofthe present: invention have been illustrated anddesoribed, herein, itais-nctintendedto limit-the invention to. such disclosures, and changes and modifications may be made therein and thereto withinthe, scope of the-following claims.

Iclaim:

1-. In a. gy-ratory crusher, upper and lower frame sections, a concave disposed for coaction with a crushing head, a wall member associated with theiupper frame section and having depend,- ing lugs at its lower: edge engaging through correspondingly positioned slots in the lower frame section, means on said wall member to support said concave in its normal working position, and means threaded on said depending lugs and the upper edge portion of thewall member respectively and arranged to engage. vertically spaced portions of. said upper andlower frame sections for predeterminedly positioning the wall member vertically with respect to said frame sections and thereby the position of said concave relative to the crushing head.

2.. In a gyratory crusher, upper and lower frame sections, a concave disposed for coaction with a crushing; head, a wall member associated with the upper frame section and, having depending lugs: at its lower edge engaging through correspondinsly positioned, slots in the lower frame seetiom an inwardly directed fiangeinternally of said wall member on which said concave is sup.-

ported in itsnormal working position, an inwardly projecting lug internally" of said wallmember engaging a slot in said concave to secure. the; latter against rotation relative to the wall member and frame sections, and locking means threaded on said depending lugs and. the upper edge portion of the wall: member respectively and arranged to engage vertically spaced portions of said upper and lower frame sections for predeterminedly positioning the wall member vertically with respect to said frame sections and thereby the position of said concave relative to the crushing head.

3. In a gyratory crusher, a lower frame section having a central hub portion, an upper frame and spider section secured upon said lower frame section and having a central housing portion, a crusher shaft having its upper end adjustably supported in suspended relation from the housing and its lower end disposed in said lower frame hub portion, means for imparting a gy-ratory motion to said shaft, a crushing head carried by said shaft, a concave disposed for coaction with the crushing head, a wall member associated with the upper frame section and having depending lugs at its lower edge engaging through correspondingly positioned slots in the lower frame section, means on said wall member on which said concave is adapted to seat in the normal working position thereof, means on said wall member engaging said concave to secure the latter against rotationrelative-to the wall member andframe sections, and means cooperable with said depending lugs and the upper edge portion of the wall member respectively and arranged to engage Vertically spaced portions of said upper and lower frame tion: and having a ntral housing, portion, a

crusher shaft having its upper end ad-lil tably supportedin suspended relation, from. the housing and its. lower end disposed. in said, lower. frame hub portion, meanafor imparting a.,gyratory mo,- tiontdsaid shaft" acrushing head. carriedby, said shaft, a concave disposed, for coaction with the crushing head, abacking ring for said. concave, a wall. member associated with the upper frame section. and having depending threaded lugs at its. loweredge, engaging, through correspondingly positioned slots. in the lower frame, section, an inwardly directed flange internally of Said wall member on whichsaid backing ring is adapted to seat in the normalworking position of the, concave, and means threadedon, said depending lugs and on the upper edge, portion of. the'wall' member I respectively and arranged to engagev vertically spaced portions. of said upper and lower frame sections. for predeterminedly positioning the wall member vertically with respect to said framesectionsand thereby vary the, position of said concave relative to: the crushing head on said shaft,

5. In a. gyratory crusher, a concave disposed for coaction with a. crushing head, means 1pporting said concave in the normal working position thereof, a plurality of springs. normally urging the concave into said normal. working, position and yieldable under predetermined stresses to effect displacement of the concave from the crushing head by the, passage of uncrushable material therebe ween a plu li y of; cyl nders ea h having a limited universal mount ng in a fixed part of the crusher, a rod extending coaxially through each cylinder and connected, atone end to said concave, a piston secured; on said rodand operable in said cylinder, hydraulic fluid in said cylinder opposing movement of the piston therein, and valve means associated with said piston providing relatively free passage of said, fluid relative to the piston in the direction, of movement corresponding to displacement of said concave and relatively restricted passage of said fluid in the other direction of travel of the. piston so that the return of the concave to working position is substantially retarded.

6. In a gyratory crusher, a concave disposed for coaction with a crushing head, means supporting said concave in the normal working position thereof, a plurality of springs normally urging the concave into its normal working position and yieldable under predetermined stresses to effect displacement of the concave from the crushi h y he pas age of unor sh b e material therebetween, a, plurality of cylinders each having a spherical base portion disposed in a spherical seat provided in a fixed part of the crusher, a member retaining the cylinder on said seat while providing limited universal movement of the cylinder relative to its seat, a rod extending through each cylinder and connected at one end to said concave, a piston secured on said rod and opera? ble in said cylinder, hydraulic fluid means in said cylinder opposing movement of the piston therein, and valve means associated with said piston providing relatively free passage of said fluid relative to the p ston in the direction of movement correspondin todisple ement of; the concave and 13 relatively restricted passage of said fluid in the other direction of travel of the piston so that return of the concave to working position is substantially retarded.

7. In a gyratory crusher, a lower frame section having a central hub portion, an upper frame and spider section secured upon said lower frame section and having a central housing portion, a crusher shaft having its upper end adjustably supported in suspended relation from the housing and its lower end disposed in said lower frame hub portion, means for imparting a gyratory motion to said shaft, a crushing head carried by said shaft, a concave disposed for coaction with the crushing head, means supporting said concave comprising a member on which said concave is adapted to seat in the normal working position thereof, a plurality of springs normally urging the concaye into its normal working position and yieldable under predetermined stresses to effect displacement of the concave from the crushing head by the passage of uncrushable material therebetween, a plurality of cylinders each having a limited universal mounting with respect to the upper frame section, a rod extending through each cylinder and connected at one end to said concave, a piston secured on said rod and operable in said cylinder, hydraulic fluid means in said cylinder opposing movement of the piston therein, and valve means associated with said piston providing relatively free passage of said fluid relative to the piston in the direction of movement corresponding to displacement of said concave and relatively restricted passage of said fluid in the other direction of travel of the piston so that return of the concave to working position is substantially retarded.

8. In a gyratory crusher, a lower frame section having a central hub portion, an upper frame and spider section secured upon said lower frame section and having a central housing portion, a crusher shaft having its upper end adjustably supported in suspended relation from the housing and its lower end disposed in said lower frame hub portion, means for imparting a gyratory motion 45 i4 crushing head, means supporting said concave comprising a backing ring and a member associated with the upper frame section and on which said ring is adapted to seat in the normal working position of the concave, adjustable means arranged to engage said sections for predeterminedly positioning the member vertically with respect thereto and thereby the position of said concave relative to the crushing head on said shaft, a plurality of springs arranged circumferentially of the concave backing ring and normally urging the same into seating engagement upon the wall member, said springs being yieldable under predetermined stresses to effect displacement of the concave from the crushing head by the passage of uncrushable material therebetween, and substantially universally mounted means operable upon displacement of the concave to retard return thereof to its normal working position.

SAMUEL W. TRAYLOR, JR.

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

UNITED STATES PATENTS Number Name Date 251,039 Gates Dec. 20, 1881 266,804 Fraser Oct. 31, 1882 348,757 McCully Sept. 7, 1886 525,410 Gates Sept. 4, 1894 1,873,671 Symons Aug. 23, 1902 1,090,216 Kennedy Mar. 17, 1914 1,436,338 Carman Nov. 21, 1922 1,592,313 Symons July 13, 1926 1,712,369 Walker May 7, 1929 1,761,240 Smith June 3, 1930 1,953,472 Fahrenwald Apr. 3, 1934 1,993,900 Rumpel Mar. 12, 1935 2,135,324 Brown Nov. 1, 1938 2,296,280 Gruender Sept. 22, 1942 2,327,384 Annesly Aug. 24, 1943 2,438,049 Gruender Mar. 16, 1948 FOREIGN PATENTS Number Country Date 188,954 Great Britain Nov. 23, 1922

Images