US1500415A - Shaking screen - Google Patents

Description

July 8 1924. 1,500,415

F, c. MORROW SHAKING SCREEN Filed Sept. 10 1923 4 Sheets-Sheet 1 July 8 1924. 1500,415

F. c. MORROW SHAKING SCREEN Filed Sent; 10. 1923 4 Sheets-Sheet 3 a Q E Qx I Q I Q Q i l I a Q m N v L Q 3 N 2 m, Q w

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F. C. MORROW SHAKING SCREEN Filed Sept. '10. 1923' 4 Sheets-Sheet 3 f R r 4 raj/01 1 040 July 8 1924.

F. c. MORROW SHAKING SCREEN Filed Sept. 10. 1923 4 Sheets-Sheet 4 Patented July 8, 1924.

UNITED 1* STATES remix 0. mormow,

PATENT OFFICE.

OF WELLS'ION, OHIO.

srmxmo scnnnn.

Application filed September as to require shipment in a knock-down condition, the services of skilled mechanics being necessary at the point of delivery for the purpose of reassembling the parts. These structures have also required specially constructed tipples which has added materially to the cost of installation.

One of the objects of the present invention is to provide a shaking screen and operating mechanism therefor all of which is combined in a complete unit that can be shipped as such from the factory to the place where it is to'be used, it being possible to set up this unit upon a tipple of any construction already in use, thereby materially reducing the cost of installation.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it n being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed with-' out departing from the spirit of the invention. V

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings- Figure 1 is a perspective view of the shaking screenv drive unit, all of the parts being assembled prior to delivery to the purchaser.

Fig. 2 is a vertical longitudinal section taken on the line 22, Fig. 3.

Fig. 3 is a section on line 33, Fig. 2.

Fig. 4 is a side elevation of one of the levers.

Fig. 5 is a front elevation of said lever.

Fig. 6 is a side elevation on a reduced 10, 1923. Serial No. 861,917.

scale showing the screens assembled with the hopper and feed plate and with'thc drlvmg mechanism as a single unit. I i Referring to the figures by characters of reference 1 designates the base frame of the unit formed preferably of channelled beams suitably connected as b means of corner plates 2. -The corner plates at one end of the base can be used to support bearings3 in which is journaled a shaft 4 having pulleys 5 and 6. The corner plates at,the other end of the base can be used for supporting bearings 7 in which is journaled a shaft 8 having sprockets 9 and 10.

' A transverse shaft 11 is journaled in bear- I ings 12 on the sides of the base and has a pulley 13 adapted to receive motion through a belt '14 from pulley 6. A. sprocket 15 is secured to shaft 11 and drives a chain 16 engaging sprocket 9. Crankarms 17 are provided at the ends of the shaft 11 and each crank arm is connected by a link 18 to the upper end of a lever 19- secured'to oneend of arock shaft 20. As shown particn larly in Fig. 5 each lever 19v has its end portions forked so that the links 18 project into the upper ends of the levers. Pivotally mounted within the upper forked portion of each lever 19 is one end of a pitman 21 and another pitman 22 extends into and is pivotally connected to the lower portion of each lever 19. The points at which the pitmans 21 and 22 are connected to each lever have been indicated at 23 and 24 respectively in Fig. 4. The fulcrum of the lever is the shaft 20 which extends through an open ing 21 in the lever and midwaiyllbetween the pivotal points-23 and 24:. e operating link 18 of each lever is attached to the lever 3.1; the upper end thereof as indicated at Secured to and rotating with the shaft 11 is a gear 26 constantly meshing with anothergear 27 secured to a transverse shaft 28 rovided with eccentrics '29. Mounted on t ese eccentrics are rings 30 rovided at the lower ends of connecting r0 s 31.

Mounted on the base frame 1 at the sides thereof are standards 32 supporting a hopper 33 from which extends an outlet spout 34. A feed chute 35 is inclined downwardly to the hopper and mounted for reciprocation within the lower portion of the ho per is an inclined feed plate 36 constitut ng the bottom of the hopper. This plate is preferably eupported by rollers or wheels 37 mounted on a track 38 and suitable guides 39 may be provided for the feed plate above and below it as shown in Fig. 2.

J ournaled between the standards 32 and under the hopper 33 is a transverse rock shaft 40 carrying bell cranks 41. The upstanding arms of these bell cranks are connected by links 42 to the feed plate 36 and the lower arms of the bell cranks are pivotally engaged by the connecting rods 31. As shown in the drawings each bell crank may be formed with a series of openings 43 so that the connecting rods can be adjustably attached to the bell cranks.

The-structure herein described is adapted to be assembled at the factory and shipped as a complete unit to the point Where it is to be set up. It can be set up bodily upon any type of tipple and obviously the cost of installation will be greatly reduced because it does not require the services of skilled mechanics for assembling the parts at the point of installation.

The pitmans 22 are adapted to be coupled to shaking screens and, by reason of the particular mounting of the pitmans relative to the levers 19 the respective screens to which the pitmans are connected will operate in opposite directions, the movement of each screen corresponding with the movement of the other screen so that the apparatus is in proper balance and can be more easily operated than would otherwise be possible. Importance is attached to the use of one lever for engagement by the two pitmans 21 and 22 as well as the link 18 because strains due to torque are reduced to the minimum and the apparatus thus rendered more lasting. Importance is also attached to the particular means for driving the feed plate 36, this means being simple and positive and allowing for easy adjustment for the urpose of varying the movement of the feed plate.

Heretofore it has been the practice when installing shaking screens, to hang the screens to the coal tipple frame so that they constitute one unit and the driving mechanism has been assembled in the tipple independently thereof. The present improvements as heretofore described provide a base frame 1 for taking up all the vibrations resulting from the operation of the drive mechanism.

If desired, however, and as shown in Fig.

6, the frame 1 can be extended so as to support standards 44 carrying a frame 45 from which the screens 46 are suspended by swinging hangers 47. Thus it will be seen that the vibrations set up both by the driving mechanism and by the screens will be received by the base frame and the tipple structure on which this frame is mounted will thus be relieved of much'of the vibration to which it would otherwise be subjected. Where the screen structure is to be mounted on a base constituting an extension of the base 1, as shown in Fig. 6, it would be necessary generally to ship the screens separately from the base frame 1 and the parts thereon. It is possible readily to assemble them, however, as will be apparent.

What is claimed is 1. A shaking screen unit for bodily attachment to a tipple orthe like, including a rigid base frame for receiving vibration and distributing it through the area of the base engaging portion of the supportin structure, a feed hopper fixedly connecte to and mounted above the base, an upper frame fixedly connected to the base, a feed plate mounted for reciprocation within the hopper, separate screens supported by the upper frame and by said frame and base respectively for oscillation, levers supported by the base frame and mounted for simultaneous oscillation, pitmans connected to each lever at equal distances from and at opposite sides of the fulcrum thereof, and connected to the respective screens, means for oscillating the levers to simultaneously swing the screens in opposite directions respectively but uniformly, a shaft journaled on the base frame, crank arms thereon, link connections between the crank arms and the respective levers, and power mechanism supported solely by the base frame for operating the shaft.

2. A shaking screen attachment for a supporting structure or tipple, said attachment being in the form of a complete unit having a rigid base for resting on the supportin structure, a feedin mechanism supports by and above the ase, suspended screens supported by the base and mounted for oscillation, power mechanism supported by the base, and means for transmitting motion from the power mechanism to simultaneously swing the screens uniformly in opposite directions respectively, said screens being balanced against each other, and means operated by said mechanism for operating the feeding mechanism, said base constituting means for receiving all vibration produced by the actuation of the mechanisms and screens.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two witnesses.

FRANK C. MORROW'. lVitnesses:

M. E. MARTIN, S. S. 8mm.

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