US1605969A - mitchell - Google Patents

Description

Nov. 9,1926. I 1,605,969

B. A. MITCHELL CRUSHER Filed Sept. 24, 1925 3 Sheets-Sheet 2 Nov. 9 1926. 1,605,969

B. A. MITCHELL CRUSHER Filed Sept. 24. 1925 3 Sheets-Sheet I} Patented Nov. 9, 1926.

UNITED STATES BENJAMIN A. MI'IGI-IELL, OF NEW YORK, N. Y.

CRUSI-IER.

Application filed September In a co-pending application for Letters Patent of the United States, Serial N 0. 520,794 filed December 8, 1921, there is shown and described and covered broadly a crusher in which the relatively movable crusher member is actuated by the centrifugal force developed by a freely movable intermediate body which has a mass center eccentric to the axis of rotation of an impeller which forms a part of a rotating system, the impeller rotating upon a fixed axis, with reference to which the movable crusher member, actuated by the centrifugal force developed by the freely movable, intermediate body, has a movement of gyration. In another copending application'for Letters Patent of the United States, Serial No. 641,040, filed May 2%, 1923, there is shown and described a modification of the construction shown and described in the earlier application, in which the shaft of the impeller is made to partake of the gyratory movement of the movable member of the crusher upon which the intermediate body acts, the aXis of the impeller coinciding at all times with the aXis of such relatively movable member of the crusher, so that the linear velocity of the intermediate body is constant and the undesirable results due to an alternate acceleration and re 30 tardation of such linear velocity are avoided. In the continued practical use of crushers constructed as shown and described in said applications, it has been found that under some conditions of use furthermodifications of certain details of construction can be made with advantage, particularly in increasing the capacity of the crusher. Such modifications are capable ofapplication to crushers constructed as shown and described in the earlier of the applications above mentioned as well as to crushers of the construction shown and described in the later of said applications. For convenience they are illus trated herein as applied to crushers of the construction shown in thelatter of said applications.

In accordance with the present invention the relatively stationary crusher member, in stead of having a continuous mantle surface, which limits the discharge of material to the opening between the two crusher members where they approach most closely to each other, is provided with openings which may be vertical slots, as to the mantle or working surface, so that the crushed material may be discharged through such openings as well 24, 1925. Serial No. 58,227.

as through the space between the two crusher members, the width-of each opening in the working face corresponding to the main width of the space between the two crusher members where they approach each other most closely, converging downwardly. Also in the present modified construction means are provided for limiting positively the eX- tent of the gyratory movement of the relatively movable crusher member, as by the provision of co-acting bearing rings, in place of the rubber or other cushioning means heretofore employed. In the improved crusher, also, the working parts are supported on cushions, preferably of rubber, for the purpose of reducing vibration. Other details of the improved construction will be referred to hereinafter.

In the accompanying drawings, in which the invention is illustrated, Figure 1 is a view of the improved crusher in which the; right-hand half is in elevation and the lefthand half is in vertical sectional elevation.

Figure l? is a'detailed view on a larger scale of the universal bearing for the rela tively movable crusher member.

Figure 2 is a view of which the right-hand portion is a top view of the construction shown in Figure 1 and part of the left-hand portion is a horizontal sectional view on the plane indicated by the broken line 22 of Figure 1.

Figure 3 is a view of which the right-hand half is a view in horizontal section on the plane indicated by the upper broken line 3-3 of Figure 1 and the left-hand half is a view in horizontal section on the plane indicated by the lower broken line 3-8 of Figure 1.

Figure 4 isa view in sectional elevation illustrating a modification in details of construction to be referred to.

Figure 5 is a sectional elevation illustrating a further modification in details of construction, the plane of section being indicated by the broken line 5-5 of Figure 6, and Figure 6 is a top view of a portion of the mantle of the relatively stationary crusher member.

Figure 7 is a detail view showing both hereinafter described, is supported by a frame 16, which supports, for vertical adjustment, through threaded hooks 16 and nuts 16 a secondary frame 28, on which is mounted the casing or housing 33 of a suitable motor, preferably electric, which constitutes the rotor or driver of the crusher. The shaft 40 of the rotor is connected through a universal 'joint of any usual or suitable construction with the shaft 45 of the impeller 45, which shaft in turn is mounted near its upper end in a composite radial and thrust bearing 45 and near its lower end in a similar composite radial and thrust bearing 45, within the relatively movable crusher member 20. The relatively movable crusher. member 20 is provided interiorly with raceways 48, with which co-act, under the influence of centrifugal action, the balls or intermediate bodies or members 46, which are received in recesses in the impeller 45. It will be seen that the impeller, as described in the application Serial No. 641,040, gyrates with the relatively movable crusher member 20 which, in the present construction, is supported for gyration by a universal bearing indicated at 18, which may be of any usual or suitable construction, comprisin in the construction shown, an internal raceway or ring 18, a double series of balls 18 and a concaved outer raceway or ring 18.

In the construction shown the coned lining or mantle 25 is supported on the relatively movable crusher member by bolts 24 and this crusher member also supports, by bolts 20 a bearing sleeve or ring 20 to be referred to hereinafter.

In the construction shown the upper member 16 of the relatively fixed crusher member 15 supports by bolts 16 the lower member 16 of the relatively fixed crusher member. This lower member 16 supports the mantle or lining 21 with which the mantle or lining 25 of the relatively movable or gyratory crusher member co-acts. In the present instance this mantle 21 is shown as having a cylindrical working surface, the conver ing of the walls of the crushing space eing secured by the coning of the mantle 25 0f the gyratory crusher member. Whereas in the construction shown in the applications above mentioned the working surface'of the mantle or lining 21 is continuous, in the present instance the mantle 21 is formed with vertical slots 21' which correspond in width to the space between the two mantles where they approach each other most closely, being shown in the drawing as having a width approximately equal to the maximum distance between the two mantles, where, converging downwardly, they approach each other most closely, in the gyration of the relatively movable member. The crushed material may thus pass outwardly from the working face of the outer crusher member and thus increase the capacity of the crusher, through the freer discharge of the crushed material from the crushing space. Openings 16 may be provided in the lower member 16 for the delivery of the crushed material discharged through the slots 21.

The lower member 16 also supports a bearing ring 16 for co-action with the bearing ring 20 of the relatively movable crusher member, so that there is provided a positive means to limit the gyratory movement of the relatively movable crusher member. It will be noted that the two bearing rings are reversely tapered somewhat so as to be drawn onto the supporting parts by the re taining bolts 20 and 16 It will be observed that all parts of the crusher are carried by the frame member 16 and in order to reduce vibration it has been found desirable to support the upper frame member 16, and through it the entire crusher, on yielding pedestals 50, preferably rubber, resting on suitable beams.

T he construction indicated in Figure 4 of the drawings is substantially like that shown in Figures 1, 2 and 3 except that the lower frame member 16 is not provided with a.

separate bearing ring, as in the construction shown in Figure 1, for co action with the bearing ring 20 of the gyratory member, and also that the concave or lining 21 is indicated by dotted lines as formed in sections, for facility in assembling and in reversing from time to time to compensate for the greater w ar which comes on the lower part of the mantle or lining.

The construction illustrated in Figures 5 and 6 is also generally similar to that shown in Figure 1 except that the mantle or lining 21, instead of being slotted all the way through from its working face outward, has slots 21 in its working face which communicate with vertical discharge openings 21 through which the crushed material may be discharged through openings, indicated by broken lines in Figure 5, at 25, in a flange 25 of the mantle or lining 25".

Obviously the openings might be formed in. the working faces of both crusher members and might be other than slots, as shown at 21 and 25 in Figure 7.

It will be understood that various changes in details of construction and design can be made to suit different conditions of use and that, except as pointed out in the accompanying claims, the invention is not restricted to the particular construction shown and described herein.

I claim as my invention:

1. In a crusher, the combination of a relatively fixed crusher member, a freely gyratory crusher member actuating means coaxial with the gyratory crusher member, and

reoaeee positive means independent of the actuating means to limit the extent of the gyratory movement of the gyratory member with respect to the relatively fixed member.

2. In a crusher, the combination. of a relatively fixed crusher member, a freely gyratory crusher member and actuating means coaxial with the gyratory crusher member, said members having co-acting bearing surfaces independent of the actuating means to limit the gyratory movement of the gyratory member with respect to the relatively fixed member.

3. In a crusher, the combination of a relatively fixed crusher member, a freely gyratory crusher member actuating means coaxial with the gyratory crusher member, and bearing rings carried by said members, respectively, and independent of the actuating means to limit positively the gyratory movement of the gyratory member with respect to the relatively fixed member.

at. In a crusher, the combination of a relatively fixed crusher member, a relatively movable crusher member, a balanced impeller, a freely movable intermediate body interposed between the impeller and the rel atively movable crusher member and subject to the action of centrifugal force, and means to limit positively the gyratory movement of the movable crusher member with respect to the fixed crusher member.

In a crusher, the combination of a relatively fixed crusher, a freely gyratory crusher member, actuating means therefor, one of said crusher members having openings formed in its working face to permit the discharge of crushed material therethrough and means carried with one of the crusher members for diverting the material passing through such openings into the path of that passing between the crusher members.

6. In a crusher, the combination of a relatively fixed crusher member, a relatively movable crusher member, the one of said members being supported by the other, and cushion supports for the supporting member, whereby the vibrations of the crusher are cushioned.

7. In a crusher, the combination of a relatively fixed crusher member having a supporting frame, cushioned pedestals to support said frame and a gyratory crusher membor supported by the relatively fixed member, whereby the vibrations of the crusher are cushioned.

8. In a crusher, the combination of a relatively fixed crusher member having a supporting frame member, a gyratory crusher member, a secondary frame member in which the gyratory member is supported and threaded hooked bolts with nuts supported by the fixed frame member and engaging the secondary frame member to support the same with capacity for vertical adjustment.

9. In a crusher, the combination of a relatively fixed crusher member, a relatively movable crusher member, an impeller, a freely movable intermediate body interposed between the impeller and the relatively movable crusher member and subject to the ac tion of centrifugal force, and means to limit positively the gyratory movement of the movable crusher member with respect to the fixed crusher member.

This specification signed this 19th day of September A. I). 1925.

BENJAMIN A. MITCHELL.

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