US2053341A - Pulsating screen - Google Patents

Description

Sept. 8, 1936. I J. E. KENNEDY 2,053,341

PULSATING SCREEN Filed May a, 1931 2 Sheets-Sheet 1 1a 24 80b 75 7 80 9 I. 70 22 2D 7a 74L 82s! 73 Ju e' hmemeg IN VEN TOR.

A TTORNEY.

Patented Sept. 8, 1936 pairs" sra'ras FFIcE" PULSATING SCREEN Joseph E. Kennedy, New York, N. Y., assignor to Nellie Kennedy, New York, N. Y.

Application May 8, 1931., Serial No. 535,847

9 Claims. (or. 209--326) and arranged whereby the screen will carry an unbalanced load in such a manner that when the screen is vibrated at high speeds it will not transmit destructive vibration to the screen mounting or building in which the screen is supported.

The invention further relates to screens of this character wherein the screen is mounted and supported on a tubular shaft or housing mounted eccentrically upon a rotatable shaft and gyrated through the rotation of the shaft. In screen supports of this character it has heretofore been the practice to mount and support the housing at the ends upona rotatable shaft and support the screen upon such tubular shaft or housing at a point within the supported ends thereof. By this arrangement there is a possibility of the housing being crushed by the continuous vibrating of the load on the screen or'the applying of an excessive load, and it is a further object of the invention to provide an improved constructed and arranged tubular shaft or housing support for the screen and mounting of the screen thereon, whereby radial thrusts on the screen supporting housing will be taken up in the bearings of the housing upon its supporting and gyrating shaft, and to provide the housing with means to co-operate with the shaft to arrange the housing as a closed lubricant carrier.

Another object of the invention relates to providing improved bearing supports for the screen carrying housing upon its supporting and gyrating. shaft and the bearing supports of said latter shaft whereby said bearing supports will not only take up radial thrusts but also longitudinal thrusts of the housing and shaft in opposite directions, and to arrange the bearing supports for the screen supporting and gyrating shaft as selfalining bearings 'to compensate for distortion in the supporting frame and thus prevent the imposing of a bending and breaking stress on the screen vibrating shaft, and to arrange the selfalining'bearings as lubricant carrying housings for the shaft bearings.

A further object of the invention is the mounting of the screen carrying frame upon its supporting and actuating shaft at the side of its transverse center nearer the feed end of the screen, and the provision of resilient counterbalancing means between the screen carrying frame and the supporting frame at opposite sides of the actuating shaft to co-o-perate with the mounting of the screen frame, on the shaft to efiect a balancing of the screen carrying frame and also re-- lievethe mounting of the screen frame on the actuating shaft of the load of the screen frame.

In screens of this character the screen carrying frame is of open rectangular form and is supported by the side members of the frame consisting of plates mounted invertical edgewise relation upon the supporting housing and the screen material is suspended at the opposite sides from said plates by bolts extended through openings in the plates and carrying screen clamping means. However, the constant vibrating of the screen and the Weight of the material thereon causes the bolts engaging the openings to enlarge the openings and thus diminish the vibrating moment of the screen and a consequent diminishing in the capacity and efliciency of the screen, and necessitating a frequent major renewal of the replacement of the entire screen frame, and it is a fur- 1 ther object of the invention to provide improved balancing weights, and the provision of a dust-- proof enclosing housing for the driving means.

Another object of the invention relates to the providing of a supporting or base frame for the screen frame having I-beam side members and the provision of means for suspending the base frame by U-bolts extended through both flanges of the beam at opposite sides of the beam Web and thus bringing into operative action ,gboth flanges and the web of the beam in the suspending of the load of the base frame with the screen frame. 1 a r In screens of this character the wearing of the screen material is much greater at the feed end than the remaining portion of the screen, and as the major portion of the screen is not worn it will be obvious that there is a great waste in renewing the screen material, and it is an object of the in- 55 Figure 3 is a side elevation of the screening apj-.

paratus showing the same in the position in which it is supported; and

Figure 4 is a detail view on an enlarged scale and partly in section of the screen pulsating means.

In carrying out the invention there is provided a supporting or base frame 5 for the screen consisting of a pair of I- bearns 2 and 3 rigidly tied together in spaced and parallel relation by'angle bars 4 and 5 and plates 6 and l secured'to one end of the beams, and by an anglebar 8 and a plate 9 secured to the opposite ends of the beams.

This frame or screen support is supported preferably in the position shownin Figure 3 by suspending the frame from cables or rods for which purpose the frame is provided with U-bolts H], H, I2 and E3 to which the suspending cables or rods are connected, one leg of each of said bolts passing through perforations in both flanges at one side of the beam web and the other leg passing through perforations inboth flanges at the opposite side of the beam web, and both legs extended through perforations in and held in position by a plate [4 and nuts l5 and I6 threaded onto the ends of the both legs, so that the weight of suspension will be taken up by the U-bolts through both flanges of the I-beam and the whole cross section of the web of the beam will be utilized for supporting the weight by bringing into operative action both flanges aswell as the center web of the I-beams.

A plate I1 is fixed upon one of the beams, in the present instance the beam 3, to serve as a support for an electric motor l8 having a suitable driving connection with a shaft 22, and shown as comprising preferably grooved pulleys I9 and 20 fixed to the motor shaft and the shaft 22, respectively, with a multiple of belts of wedge shape in 'cross section passed around the pulleys and engaging the grooves therein. To protect the pulleys l9 and 20 and driving meansZ I from grit, etc., they are enclosed in a suitable housing, as at 24.

The shaft 22 is mounted in bearings 25 and 26 fixed upon the frame beams2 and t by bolts and nuts, as at 2'5, the mounting of the shaft in the bearings being arranged to take up end thrusts of the shaft'i'n both directions and whereby the shaft will beself-alining in the bearings to compensate for any distortion of the frame l due to an unbalanced load upon the frame, and prevent the imposing of bending and breaking stresses on the shaft. 7 t

The mounting of the shaft 22 in both bearings is the same and description of one will, therefore, suffice for both. As shown in Figure 4, a bearing block 28 fixed on the frame has a cap 29'connected thereto, the opposite faces of which block and cap are arranged'of corresponding arcuate shape in cross-section, asat Bii, and the block and cap having a recess 3! to provide a lubricant receiving channel.

An annular member 32 is mounted in the bearing block 28 and. cap29 having the outer face arranged of arcuate shape in cross section to correspond with the arcuate face of the block and cap, said member carrying therein an anti-friction bearing, shown as of the roller type and embodying two bearing members with the outer ring member 33 of each of said bearings fitted snugly in the annular member 32, and the inner ring member 36 fitting over the end of the shaft of reduced diameter against a shoulder 31. The bearing rings are arranged whereby the rollers 34 rotate on axes inclining to the axis of shaft 22 and in opposite directions to each other, so as to take up not only radial but also end thrusts of the shaft in both directions. The bearing members are removably retained on the portion of reduced diameter of the shaft 22 in abutting relation to the shoulder 31 by a nut 38 engaged on a threaded portion 39 of said shaft.

To prevent grit, etc., from entering the bearings and to provide lubricant carrying housings for the bearings, dust rings 40 and 4 I are arranged to engage the shaft at opposite ends of the bearings and secured to the ends of the member 32 by screws 42 and tie rods 43, as clearly shown in Figure 4.

A pair of fly wheels 44 and 45 of special form are mounted on the shaft 22 within and adjacent to the bearings of the shaft and connected to the shaft to rotate therewith by keys 46. Each fly wheel, as clearly shown in Figure 4, has an annular peripheral recess 41 extended therein from one side and carries therein eccentric to the axis of the wheel acounterbalancing Weight 48 secured to the wheel by bolts 49, the fly wheels having an elongated hub 5| whereby they are mounted concentrically on the shaft with the outer surface of the hubs arranged eccentrically to the axis of the wheel and diametrically opposite the weights 48. The fly Wheels also have an annular recess 50 extending about the hub in the side thereof opposite that in which the recess 41 is arranged with an opening 52 in the wall of said recess 50 for a purpose hereinafter described.

A hollow shaft or housing 5! is arranged at the opposite ends with a bearing chamber defined by an annular wall of increased diameter relative to the diameter of the intermediate portion of the housing, and shown as a portion 56 of increased diameter whereby the housing is mounted on the shaft 22 with the portions of increased diameter extending about the hub of the fly wheels and into the annular recess 56 extended into the side of the flywheels opposite the recess ii. The housing is mounted eccentrically on the shaft through anti-friction bearings, shown as of the roller bearing type, arranged with the rollers to rotate on axes inclining in a direction from the outer ends of the shaft toward the axis thereof. The inner ring 53- of the bearings-is fitted on a portion of the eccentric hubs of reduced diameter with one end abutting the shoulder formed by said reduced portion, and the outer ring 55 fitted snugly in the portion of increased diameter 56 abutting a shoulder therein opposed to the shoulder engaged by the ring 53, and whereby the bearingsare adapted not only to take up theradial load placed upon the housing, but also will take up end thrusts upon the housing in both directions. The internal diameter of the housing is greater than thediameter of the shaft 22 thereby providing a chamber 6! between the housing and shaft adapted for the carrying of'a lubricant, andto arrange the housing as an entirely closed chamber and to also prevent 'entrance of foreign'substances therein a dust ring 58 is secured to the end of the housing enlargements 56 by screws 59,-said rings being provided with an opening'having a removable cap 66 for the supplying of lubricant to the chambe'r'6l, the openings 52 in the fly wheels being provided to get access to said openings. 'Io retain the fly wheels on shaft 22 against longitudinal displacement and to also take up wear in the bearings of the housing or tubular shaft on shaft 22 adjusting means 62 are provided on a threaded portion 63 of the shaft 22 at the outer side of the fly wheels. a y

" The outer peripheral surface ofthe housing enlargements 56 is reduced in diameter to providethe housing with an exterior laterally extending flange or shoulder 64 and upon which reduced portion plates 66 and 69 are mounted in edgewise relation to support and serve as the side members of a supporting frame for a screen or screens, said plates being relatively thin and V V to reenfo-rce the same plates '6'! and 69 are juxtaposed to the outer side of said plates 66 and 69. While it is not absolutely essential, said plates may be secured to the housing enlargements 56 by extending the shoulder or flange formed by the reducing of the housing enlargements, as at 64c, and "bolts 64b to secure the plates to said flanges.

The screens 89,8! and 82 (Figure 2) are supported in superposedrelation from the plates 66 and 69, said plates being secured together in spaced relation by angle bars 14 and 15 secured to anglebrackets 19, H, 12 and i3 fixed to the plates. The screens are mounted on angle bars i6, 1?, l8 and 19 fixed to and 'extendinglongitudinally of the plates 66'and 69 by clamping plates a and bolts 861), as shown in Figure 2. Each screen is preferably arranged of two or more parts or sections, as shown in Figure 3, so that should one section become worn before another the worn section maybe readily replaced without replacing the entire screen and thus making for a saving in expense of maintenance.

The plates 66 and 69 of the screen supporting frame are mounted on the housing 56 at one side of their transverse center and nearer the feeding end of the screen and is resiliently supported at the ends from the supporting frame I by members 83, 84, 85 and 86 fixed to the outer side of and extending laterally from the screen supporting plates 66 and 69 engaging springs 81 on supports 88, 89, 96 and- 9| fixed on and extending inward from the side beams 2, 3 of the supporting frame, these supports being spaced relative to the mounting of the screen supporting frame on the housing 56, as indicated by the lines 92, 93 in Figure 3.

While the preferred embodiment of the invention has been illustrated and described, various modifications may be made in the construction and arrangement of the parts without departing from the scope of the invention.

I claim:

1. In screening apparatus, a supporting frame, a shaft extending transversely-of and journaled on said frame, a pair of fly wheels having eccentric hubs mounted concentrically on the shaft, a tubular housing engaged on the shaft between the fly wheels and having a bearing support at the ends upon the eccentric hubs of the fly wheels to have gyratory movement imparted thereto by the rotation of the shaft, and a screen supporting frame mounted intermediate the ends upon the housing in alinement with the bearing support of the housing on the shaft bers of increased diameter and engaging about the eccentric hubs of the flywheels, bearings at the ends in the bearing chambers of increased diameter supporting the housing upon said hubs,

and screen supporting plates mounted on the ends of increased diameter of the housing in vertical alinement with the bearing supports of the housing on the hubs of the fly wheels.

3. In screening apparatus, a'supporting frame, a shaft extending transversely of and journaled on the frame, a pair of fly wheels having hubs whereby the wheels are mounted concentrically on the shaft in spaced relation to each other to rotate with the shaft, and the exterior of said hubs arranged eccentric to the. axis of the wheels and having a shoulder inward. from the end thereof, a tubular housing engaged on the shaft to extendbetween thefly wheels having an internal diametergreater than the diameter or the shaft and the ends arranged with bearing chambers of enlarged diameter to extend about the hubs of the fly wheels and said bearing chambers having an annular shoulder inward'from theen'ds thereof, anti-friction bearings fitting in the bearing chambers and supporting the housing at the ends of enlarged diameter on the eccentric hubs of the fly wheels, the outer rings of said bearings abutting the shoulder in the housing and the inner rings abutting the shoulder on the hubs, and said bearings arranged to take up radial and longitudinal thrusts transmitted to the housing, and screen supporting plates mounted on the bearing chambers of the housing in vertical alinement with thehousing bearings on the hubs of the fly wheels.

4. Screening apparatus as claimed in claim 2, wherein the fly wheels are mounted on the shaft to have adjustment axially thereon, and means threaded onto the shaft at the'ends of the fly wheels opposite the ends of the housing to hold the wheels relative to the housing and take up wear in the bearings of the housing. on the wheel hubs.

5. In screening apparatus, a supporting frame, a shaft journaled on and extending transversely of said frame, a housing engaged on the shaft having a laterally extending annular shoulder adjacent each end, anti-friction bearings eccentrically mounted on the shaft fitted within the ends of the housing in alinement with the annular shoulders to support and transmit the rotary screen material secured to the side of the first plates opposite to the second plates and in conjunction with said second plates reinforcing the first plate. i

. 6. In screening apparatus as claimed in claim 2, an annular member fixed to each end of increased diameter of the housing and having a bearing on the hubs of the fly Wheels to close the ends of the housing andarrange the housing as a lubricant carrier.

'7. In screening apparatus, a supporting frame, a shaft j'ournaled on and extending transversely of said frame, a housing eccentrically mounted on the shaft to transmit the rotation of the shaft to gyratory movement of the housing, and a screen carrying frame mounted on said housing to participate in the gyratory movement thereof having side members consisting of plates of relatively thin material mounted edgewise on the housing, and a second plate of less area than the first plates mounted on-the housing juxtaposed to the portion of the first plates mounted on the housing, and bars to support the screen material secured to the first plates at the side opposite to the second plates and said bars in conjunction with the second plates reinforcing the first plates.

8. In screening apparatus, a supporting frame, a rotatable shaft extending transversely. of and carried by said supporting frame, a tubular housing engaged upon said shaft having the opposite end portions enlarged to increase the diameter thereof relative to the diameter of the intermediate portion of the housing and an annular laterally extending shoulder intermediate the ends of said portions of increased diameter, anti-friction bearings-eccentrically mounted on the shaft having the outer rings fitted within the end portions of increaseddiameter of the housing, andthe portions of increased. diameter and bearings and the mounting of the bearings on the shaft arranged to take up axial thrust on the housing through the bearings, andthe screen carrying frame having side members mounted on the end portions of increased diameter of the housing in abutting relation to the annular shoulders to take up the load of the screen carrying frame on the housing by the shaft through the bearings. a Y

9. In screening apparatus, a supporting frame, a rotatable shaft extending transversely of and carried by said frame, a tubular housing engaged upon and of increased diameter relative to the shaft having the opposite ends arranged of increased diameter relative to the diameter of the intermediate portion of the housing to constitute bearing chambers, and each bearing chamber having an exterior laterally extending annular flange, roller bearings fitted within said bearing chambers eccentrically mounted on the shaft to support the housing eccentrically on the shaft and transmit the rotation of the shaft to gyratory movement of the housing, a screen carrying frame embodying side plates engaged onthe bearing chambers in abutting relation to the flange and in line with the bearings to support the screen carrying frame on the housing to take up the load of the screen carrying frame on the housingfby the shaft through the bearings, and annular members fixed to the ends of the housing co-operating with the mounting of the bearings on the shaft and arrange the housing as an entirely enclosed housing.

JOSEPH E. KENNEDY.

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