US1673342A - Eccentric mechanism for separators - Google Patents

Description

June 12, 1928.

T. J. STURTEVANT ECCENTRIG MECHANISM FOR SEPARATORS \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\m 7. H rm m m 1m r 2 4 m e, o 0 \Q y D o m\ M 0 NW: k. Q a F Q .9 Q S Q W gw a in M fi m r.||\|\ June 12, 1928. 1,673,342

T. J. STURTEVANT ECCENTRIC MECHANISM FOR SEPARATORS Filed July 16, 1926 2 Sheets-Sheet 2 Ir' D e11 0 r: 7770mm JASiaz-feyazzi arr):

Patented June 12, 19238.

UNITED STATES PATENT OFFICE.

THOMAS J. STURTEVANT, OFWELLESLEY, M SSACI-IUSETTSfASSIGNOR TO STURTE- VANT MILL COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTS.

ECCLENTRIC MECHANISM FOBSEPARATORS.

Application filed July 16, 1926. Serial No. 122,781.

The invention to be hereinafter described relates to eccentric mechanisn'i for vibrating separator screens, and more particularly to eccentric mechanism which is called upon to contribute to the support of the screen, and therefore experiences heavy duty. The invention provides a strong, durable construction, roller hearings for reducing friction, readily accessible means for supplying lubricant to the bearings, meansfor conveniently etlecting adjustn'ient to compensate for Wear on the bearings, and means for protecting the bearings from the dust which is present in the air in which the eccentric mechanism operates.

The character of the invention may be best understood by reference to the following description of embodiments thereof shown in the accompanying drawings, wherein:

Fig. 1 is a vertical section through one type of separator equipped with eccentric mechanism embodying the invention;

Fig. 2 on an enlarged scale is a section through a portion of the mechanism shown in Fig. l;

Fig. 3 is a vertical section through the eccentric mechanism having Hyatt roller bearings;

a is a vertical section through the eccentric mechanism having Timken roller bearings; and

Fig. 5 on a reduced scale is a vertical section taken on line 5 5 of Fig. 3.

The eccentric. mechanism is suitable for vibrating screens of separators of diifierenttypes, and is designed more particularly for vibrating screens which receive support from the eccentric mechanism. In Fig. 1 is shown a separator comprising a frame 1 having one end pivotally mounted on a rocker 3 and its opposite end adjustably supported by screw posts 5. Screen clothing 7 is stretched between an eccentric mechanism 9 mounted on the frame and spring-pressed rods ll mounted on the frame. The construction is such that the eccentric mechanism shifts the screen in one direction and the spring-pressed rods 11 shift the screen in the opposite direction. Since this separator is substantially the same as the separator disclosed in my copending application Serial No. 10,163, filed February 19, 1925, it is unnecessary to show and describethe separator in detail herein.

same, and on release will gravitate to and remain in closed position.

At opposite ends of the casing are openings S1 and 33 adapted to receive journal boxes 35 and 37 of general cylindrical form and confined against axial movement by dowels 39 and 4:1. Mounted in these boxes are Timken roller bearings, each comprising an outer raceway 43-, an inner raceway 45 and tapered rollers 17 between the raceways. The inner raceways are mounted fast on re duced portions of a shaft 19 which has an end 51 projecting beyond one side of the casing and adapted to receive a suitable pulley.

At one end of the box 35 is a head 53 through which the shaft extends, said head being provided with a pair of annular grooves 55 adapted to receive packing washers. Fitted into the inner side of the box 35 is a collar 57 secured by a set screw 59 entered through the box, said collar having an annular groove 61 receiving a packing washer.

Theother box 37 has a collar 63 fitted into the inner side thereof and secured by a set screw 65, said collar having an annular groove 67 receiving a packing washer. At the outer side of the box 37 is a head 69 having a flange 71 fitted into the box and adapted for engagement with the outer raceway as, said head being secured to the box by screw bolts 73.

As stated, this mechanism has heavy duty, and therefore, it is desirable to provide means for adjusting the bearings to compensate for wear thereon, and at the same time it is important that the proper degree of adjustment should be made. To this end ring-shaped shims 75 are interposed between the body of the box 37 and its cover 69. When it is desired to make the adjustment to compensate forwear, the screw bolts 73 are released to permit the cover 69 to be withdrawn and one of the shims removed. Then the cover is returned to place, and the screw bolts 73 are tightened. This will cause the cover flange 71. to press against the outer raceway -13 of the box 37, and through the rollers and inner raceways of said box the shaft will be slightly shifted axially to the left (Fig. 4) and shift the inner race-- way of the box 35 somewhat to the left relatively to the outer raceway 43. As a consequence. through the adjustment of the cover accessible externally of the casing, any lost motion may be quickly and easily taken up between the raceways and rollers of the bearings for the shaft. The ease of this adjustment and the short time necessary in its lCCUlllPliSlllllEllt are important, since it desirable that the mechanism shall be inoperative for as little time as possible in making the adjustment.

Bearings in the boxes may be supplied with grease by the Alemite system. To this end the box has a port tapped to receive a neck 77. and the cover 69 of the box 37 has a port tapped to receive a neck Mounted on the shaft 51 between the boxes 3") and 37 is an eccentric sleeve 81, and encircling said sleeve are a pair of rings 83 eccentric in form and so disposed with respect to the eccentric sleeve as to counterbalance the same. Screw bolts 85 are threaded into the thickest portions of these rings and entered through the sleeve into the shaft in order to lock the sleeve and rings to the shaft.

A cylindrical housing 87 has a body 89 provided with covers 91 at opposite sides thereof. and having apertures through which the shaft extends. The covers 91 are secured to the body 89 by screw bolts 93. said covers having annular grooves 95 containing packing washers. Mounted in the housing 87 are a pair of Timken roller bearings. each comprising outer raceways 97 fitted into and secured to the housing body 89. inner raceways 99 on and secured to the shaft, and tapered rollers 101 between the outer and inner raceways. A circumferential flange 103 on the sleeve projects between and is engaged by adjacent ends of the inner raceways. thereby to hold them in proper spaced relation. These Timken roller bearings may he lubricated by the Alemite s teni. thicovers thereof being provided with ports tapped to receive necks 105 for this purpose.

The housingbody 8.) has a circum't'" rential groove 107 therein adapted to receive a strap 109 which projects outward from the casing and is connected to one end of the screen as will be noted in Fig. 1. While a strap is disclosed herein as one form of follower which may be provided for the eccentric. it will be understood that other forms of followers may be employed.

In order that adjustment may be made to compensate for wear on the Timken bearings in the housing 87, ring-shaped shims 111 (Fig. 2) are interposed between the housing body 89 and the covers 91, and the covers are l'ormed to present flanges for engagement; with the outer raceways UT. The construction is such that. when it. is desired to make adjustment to compensate for wear on the bearings, the screw bolts 93% may be released thereby to permit the covers to be slid outward somewhat along the shaft. Then the outermost shims may be ripped out and. the covers may be returned and the screw bolts set up. This will cause the cover flanges to press against the outer raceways and take up any lost motion in the bearings. The thickness of the shims removed determines the extent of the adjustment and therefore there is no danger of excefs adjustment such as would unduly increase the wear on the bearings. it will be understood that ready access may be had to the housingcovers for the purpose of this adjustment after the upper part 17 of the casing 13 has been lifted from the lower part of the casing.

The parts of the eccentric mechanism described may be easily and quickly assembled. To accoi'nplish this. the housing" 87 and the 'limken bearings therein are mounted on the shaft. the boxes 35 and 37 and the Timken bearings therein are mounted on the reduced portions of the shaft. and then the shaft with the housingand boxes thereon may he presented to the lower part of the casing. the boxes being placed in proper registration with the dowels Ill) and i1. l. hereupon. the upper part of the casing may be placed in position and the bolts 23 may he applied and set up to secure. the parts togcther.

The hearings in the journal boxes are protected by the closed boxes from ingress of dust therein, and the hearings in the llflllh" ingare enclosed by the homing and protected from ingress of dust therein. This is an important consideration in prolonging the life of the hearings. v

In Fig. 3 there is shown a modified form of eccentric mechanism comprising a casing 113 which may have upper and lower parts detachably secured togethe as in the form of the mechanism shown in Fig. 4.

Mounted in the openings in the ends of the casing are journal boxes 115 and 117 confined against axial movement. by dowels 119 and 121. The box 115 has a cover 123 detachably secured to the body of the box by screw bolts. 125. said cover having an annular groove 127 containing a packing washer. The box 117 has a cover 129 secured to the body of the box by screw bolts 130.

Mounted in the boxes 115 and 117 are Hyatt roller bearings, each comprising outer raceways 131, and cages 133 carrying rollers 135. Each of these rollers isformcd from a helically wound fiat strip of steel having slight flexibility, the rollers of each bearing being wound alternately right hand and left hand. To supply lubricant to the bearings, necks 137 are tapped into ports 139 in the covers and con'imunicate with ducts 1411 leading to annular grooves 143 in the boxes. Said grooves in turn communicate with holes 145 in the outer raceways 131. The construction is such that the lubricant is conveyed from the ports 139 to the ducts 141, thence to the grooves 143 and through the ports 141-5 to the rollers. The lubricant is distributed by the right and left Winding spaces between the convolutions of the rollers over the entire rolling surfaces of the bearings.

A shaft 147 journalled in the Hyatt roller beaings, extends through an aperture in the box cover 123, and toward but not to the box cover 129, said shaft having an end portion adapted to receive a pulley.

The shaft is formed to provide an eccentric 1&9 (Fig. 5), and mounted on said eccentric between the journal boxes 115 and 1.17 is a cylindrical housing 151 having a body 153 at one end of which is a head 155 apertured to receive the shaft, and at the opposite end of the body is a cover 157 also apertured to receive the shaft.

Hyatt roller bearings are mounted in the housing 151 similar to the bearings already described and comprise outer raceways 159 fitted into and secured to the housing, cages 161-and rollers 163 carried by the cages. Lubricant is supplied to the bearings in the hous ing through necks 165 tapped into ports 167 in the body of the housing and communicating with annular grooves 171 in the housing body, said grooves in turn communicating with holes 173 leading to the rollers 163. The construction is such that lubricant may be conducted through the ports 167 to the annular grooves 171 and through the holes 173 to the rollers. The housing body .153 has an annular groove 175 adapted to receive a strap 17'? or other suitable follower.

T he parts of this mechanism may be quickly and easily assembled. To accomplish this, the housing 151, and the Hyatt roller bearings therein are mounted on the eccentric portion of theshaft, the bearing boxes 1.1.5 and 117 and the Hyatt bearings therein are mounted on the shaft at opposite sides of the housing, and the unit comprising these parts is then seated on the lower part of the casing with the boxes in proper registration with the dowels 1.19 and 121. 'ilherenpon the upper part of the casing is mounted on the lower part of the casing and bolted thereto.

The 'limken roller bearing mechanism including the boxes, the eccentric housing and the shaft; and the Hyatt roller bearing mechanism including the boxes, housing and shaft are so constructed that'the two units are interchangeable in the casing and may be selectively used according to conditions as desired.

It will be understood that the invention is not limited to the specific embodiment shown, and that various deviations may be made therefrom without departing from the spirit and scope of the appended cliams.

lVhat is claimed is:

1. An eccentric mechanism comprising, in combination, a casing having separable up per and lower parts with openings in the ends thereof, journal boxes in said openings, a shaft, bearings for said shaft in said boxes andeach comprising an outer raceway in the box, an inner raceway on the shaft, and rotative elements between said raceways, an eccentric on the shaft between said boxes, :1- housing for the eccentric having apertures in the ends thereof receiving the shaft, said housing being formed. to receive a follower; and a bearing in said housing comprising a 1'EIC8\ ay on the eccentric, a raceway on the housing, and rotative elements between said raceways, the upper part of said casing being removable from the lower part of the casing, thereby to permit the shaft, its boxes, the eccentric, and its housing and bearing to be removed as a unit from the casing.

2. An eccentric mechanism comprising, in combination, a casing having separable l p-a per and lower parts with openings in the ends thereof, journal boxes in said openings, a shaft, bearings in the journal boxes for the shaft, an eccentric on the shaft between said boxes, a housing on the shaft, formed to receive a follower, and a bearing in the housing for the eccentric, said shaft, journal boxes, eccentric and housing being removable as a unit from the casing on separation of the upper part from the lower part of the casing 3. An eccentric mechanism comprising, in combination, a casing provided with journal boxes having bearings therein, each comprising outer and inner raceways and'rotative elements between said raceways, a shaft received by the inner raceways, an eccentric on the shaft in the casing between said boxes, a housing mounted on the shaft, formed to receive a follower, a pair of hearings in the housing, each comprising an outer raceway secured to the housing, an inner raceway secured to the eccentric, and rotative elements between said raceways, said housing having a body and covers with provision for adjusting said covers relatively to the body and in the direction ofthe axis of the shaft, thereby to operate through said outer racewaysin the housing to take up 10st motion in the bearing? in the housing.

4. An evcentiric mechanism comprising, in ronlhination. a casing providml with journal hoxes, bearings therein, ear-h comprising ()nier and inner i'acenays and rotative elonients hrnveon F2111] rauoways, a shaft received by the inner 1'ilClf\\'2l y:; an eccentric on Ti-IOMAS J. (TU R'IEV AN T.

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