US2893559A - Shaking screen, particularly resonance screen - Google Patents

Description

y 7, 1959 R. TEUTEBERG 2,893,559

SHAKING SCREEN, PARTICULARLY RESONANCE SCREEN Filed July 8, 1957 2 Sheets-Sheet l ill/[425% V a I INVENTOR RUDOLF TEUTEBERG ATTORNEYS SHAKING SCREEN, PARTICULARLY RESONANCE SCREEN Filed July 8, 195'.

R. TEUTEBERG July 7, 1959 2 Sheets-Sheet 2 INVENTOR RUDOLF 7Z'UTEBERG ATTORNEYS United States Patent SHAKING SCREEN, PARTICULARLY RESONANCE SCREEN Rudolf Teuteberg, Dortmund, Germany, assignor to Schuchtermann & Kremer-Baum Aktiengesellschaft fur Anfbereitung, a corporation of Germany Application'July 8, 1957, Serial No. 670,555 Claims priority, application Germany July 10, 1956 6 Claims. (Cl. 209-365) The development of the stops requires particular care.

In particular the surface of the stops which strikes against the elastic recoil buffers must be carefully smoothened in order to avoid premature wear of the recoil buflers which consist predominantly of rubber. Up to the present time, the stops have been made intergal with their mount by casting or welding. In this connection, the careful smoothing of the effective stop surfaces however affords considerable diificulties and expense, particularly costs for tools, since the surfaces of the support are only accessible with difiiculty to the machining tools.

In accordance with the present invention, the stops are fastened in a removable manner and centered via extensions in pairs in the bore of a holding piece fastened to the screen box. The stops can thus be machined separated from the holding member and are preferably developed as bodies of revolution. Since the stops are not included in the shaping of the holding piece, there is obtained a compact construction of the holding piece of light weight. The stops can, for instance, be clamped against each other in the holding piece via clamping screws passing centrally through them. In another embodiment of the invention, the stops are screwed into the holding piece via the threaded extensions. In both embodiments, but particularly in the last mentioned embodiment, it is advantageous to develop the holding member provided with a bore as a longitudinally slit socket so that the stops can be clamped fast in any positions independent of each other by tightening the clamping screws of the socket.

Two embodiments of the fastening of the stops in accordance with the invention are shown in the drawing.

Fig. 1 shows a buffer arrangement in section, while Fig. 2 is a section along the line 2-2 of Fig. 1. Fig. 3 shows a bufifer arrangement in accordance with Fig. 1 with modified displacement block, Fig. 3a shows a similar embodiment in which, however, the stop and buffer supports are interchanged. Fig. 4 shows another embodiment of the recoil buffer unit in vertical section, while Figs. 5 and 6 are sections along the lines 5-5 and 66 respectively of the embodiment shown in Figs. 4 and 5 respectively.

The displacement block 1 is arranged on the screen frame 2 and bears two corresponding buffer plates, one of which 3 is arranged on the end surface 4 of the displacement block 1 while the other 5 is held by two clamping spindles 6, 7 at the desired distance from the plate 3. Both buffer plates 3, 5 bear on their facing surfaces circular elastic recoil buffers 8, 9 acting as storage springs. Between the two recoil buffers 8, 9 there are provided stops 10, 11 which are fastened by means of a holding member 12 to the screen box 13.

The holding member 12 has a bore 14 which provides an accurate seat for the stops 10, 11 provided with a centering ring 15 and clamped by a central clamping screw 16. The play a between the stops 10, 11 and the corresponding recoil buifers 8, 9, which is the same on both sides in the central position of the screen box, can be changed tothe desired extent and accurately adjusted by the insertion of replaceable shim disks 17 between the holding member 12 and stops 10, 11..

Of course, the reversal of the arrangement shown in Figs. 1 and 2 is feasible in accordance with which the recoil buifers instead of the stops are fastened to the holder member and the stops assume the position of the recoil buffers shown in the figure. Furthermore, as shown in Fig. 3, the displacement block 18 can be developed as supporting rail with a recess 19 to receive the buffer plates, etc. In this way, the two clamping spindles 6, 7 can be dispensed with. Furthermore, the attachment of the displacement block in the frame which, as a rule, is a boxshaped hollow girder is facilitated. It is then merely necessary to provide a recess in the girder through which its fastening end is passed in order then to weld it at the longitudinal edgesto the girder for the attachment. In Fig. So there is shown an arrangement similar to that of Fig. 3. In this connection, however, the displacement block 181 has two corresponding stop plates 101' and 111, while the corresponding recoil buffers 81, 91 have their bufier plates 41, 51 fastened to the holder member 121. In this connection, the play which is the same on both sides can be set by changing the position either of the stops or of the buffer plates.

The shaking screen, in accordance with Figs. 4 to 6, consists of the base frame 21 and the screen box 22 supported thereon with guide springs. The screen box engages in the swinging direction via stops 23, 24 fastened to it between two recoil buifers 25, 26 which are fastened to the base frame 21 by means of a support 27. The atrangement in this connection is such that a free clearance a, a is present between the pair of stops 23, 24 and the corresponding recoil buffers 25, 26. Depending on the size of the shaking screen, two or more recoil bufler units 2526 are provided between the screen box and its base frame.

The screen box 22 and its base frame 21 are placed in shaking motions directed opposite to each other by a rocker drive arranged between them with loose coupling. In this connection, the screen box is swung back and forth between the recoil buffers 25, 26 in swinging direction with an amplitude which is greater the greater the setting of the play a, a between the recoil buffers 25, 26 and the stops 23, 24.

In order to be able suitably to adjust the play a, a at all times to the requirements, the stops 23, 24 are screwed with threaded pins 28, 29 from the front sides into a common supporting socket 30. The supporting socket 30 has its supporting frame 31 fastened to the screen box in such a manner that its longitudinal central axis lies in the direction of swing of the screen box. It is slit in longitudinal direction, has an internal thread which fits the threaded pins 28, 29 and is also provided with clamping screws 32. By the screwing of the stops 23, 24 to a greater or lesser extent into or out of the holding socket 30, the play a can be set as desired for each stop in ac cordance with the requirements. By tightening the clamping screws 32, the stops can be firmly clamped in the new position in the holding socket.

In this embodiment also it is unimportant whether, as shown in the figure, the recoil buffers 25, 26 are seated on the base frame or whether they are seated on the screen box. It is also directly possible to fasten the recoil buffers to the adjustable stops 23, 24 and to ascribe the function of. the stops to the support 27 and par,- ticularly the supporting plates 33, 34.

I claim:

1. In a shaking: screen comprising a screen frame serving as a counterweight, a screen box and mounting means including stops and buffers operatively interconnected. between the screen frame and screen box for aidingin defining shaking of the screen box relative to the screen frame;v the improvement which comprises pairs of: elastic recoil buffers mounted on the screen frame, a pair of stops mounted in a holding member, the stops of each pair being axially aligned and in oppositely disposed relationship, anextension for each holding member fixedly securing the holding member to the screen box with the'stopsof the holding member operatively disposed with play between the bufiers of a pair of said elastic recoil buffers, and means for detaching the stops fromthe' holding members.

' 2; A shaking screen according to claim 1, the holding members each comprising a [hollow tube having end portions providing seats for the stops mounted thereon, and clamping means for urging the stops toward each other into engagement with said seats.

3. A shaking screen according to claim 1, each stop having, athreaded shank projecting axially from the stopopposite the working face theref,the holding memhers each comprising an internally threaded-tube-in which the shanks of its stops are threaded.

4. A shaking screen. according to claim 1, each stop 4 having a shank projecting axially from the stop opposite the working face thereof, the holding members each comprising a hollow tube in which the shanks of the holding members stops are received, and positioning means for selectively positioningithe shanks axially in the holding member tubes.

5. A shaking screen according to claim 4, the positioning means comprising an axially'extending slit in the holding member extending fihelength thereof, and means for urging'the slit closed to thereby secure the said shanks in place.

6. A shaking device according to claim 1, comprising a displacement bar fixedly secured to the screen frame and having means defining a recess therein, a pair of elastic recoil buffers being mountedin said recess, a pair of stops being operatively disposed between the buffers mounted in said recess.

, References Cited in the file of this patent UNITED STATES PATENTS 2,332,600 Rapp Oct. 26, 1943 2,701,061 Kluge Feb. 1, 1955 FOREIGN PATENTS Germany Sept. 27, 1937 932,643 Germany Sept. 5, 1955 459,642. Great Britain Jan. 12, 1937 698,223 Great Britain Oct. 7, 1953

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