US2071945A

US2071945A - Wheel and axle assembly

Info

Publication number: US2071945A
Application number: US659659A
Authority: US
Inventors: Alfred H Oelkers; Fred E Bachman
Original assignee: American Steel Foundries
Current assignee: American Steel Foundries
Priority date: 1933-03-06
Filing date: 1933-03-06
Publication date: 1937-02-23
Anticipated expiration: 1954-02-23

Description

Ill/l//l A. H. OELKERSv ETI AL WHEEL AND AxLE ASSEMBLY 3 Sheets-Sheet 2 Feb. 23, 1937. v A. H. oELKERs ET AL 2,071,945

v WHEEL. AND AXLE ASSEMBLY Filed March e,- 1955 s suena-sheet s Y i I g Eli lvl:

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ZZf/eQi/ @s/nef@ eddC/Zmm Pme-med Feb. 1937 UNITED STATES WHEEL AND AXLE` ASSEMBLY Alfred H. oelkers and Fred E. Baehman, chicago, Ill., assignors to American- Steel Foundries, Chicago, Ill., a corporation of New Jersey Application March 6, 1933, Serial No. 659,659

23 Claims.

This invention relates to improvements in wheel and axle assemblies for railway rolling stock and amount of lateral movement of the journal box assembly on the axle end is permitted and of a construction that permits easy removal of the roller bearing from the journal box without removing the journal box from the car truck and also a, construction which permits the replacement of any -single part of the assembly without special tools and without removal of the journal box from the car truck.

It is further an object `of the present invention to provide improved means through which a roller bearing unit is positioned upon an axle end.

It is further an object of the present invention to provide a resilient support for a journal box upon a roller bearing assembly carried by an axle.

With these and various other objects in view, the invention may consist of certain novel features of construction and operation as will be more fully described and particularly pointed out in the specification, drawings and claims appended hereto. e

In the drawings: f

Figure 1 is a sectional elevation of a wheel and axle assembly;

Figure 2 is an end elevation of Figure 1 with the left portion of the journal box cover out away;

Figure 3 is a sectional elevation similar tol Figure 1 showing a modified construction;

Figure 4 is an end view of Figure 3 with the left portion of the journal box cover cut away;

Figure 5 is a sectional elevation similar to Figure 3 but illustrating a modiiled construction of the roller bearing assembly;l

Figure 6 is a detail section of a roller bearing assembly showing a modified arrangement; and

Figure 7 is a detail view similar to Figure 6 illustrating a further modification.

In Figure 1 the car axle 20 has i'lxedly mounted thereon a wheel 22. Adjacent the wheel 22 a deilector ring 24 is mounted on the axle. A reduced portion 26 of the axle extends into the journal box 28. The rear wall 30 of the journal box has an annular portion 32 closely adjacentthe cylindrical surface of axle 20. The wall 30 also has la flange 34 overlapping the deilector ring 24. A

lubricant deilector ring 35 is provided at the inner end of the rollerbearing assembly. These parts, therefore, serve as sealing means to prevent the loss of lubricant from the journal box and the entrance of dust. The journal box is closed at its outer'end by a, cover 36 secured by bolts 38.

The axle has a tapered portion 39 upon which is fitted the correspondingly tapered portion of one part 40 of the rollerA bearing cone. The second part 42 of the roller bearing cone has an annular fit over the part 40 and abuts against a shoulder 4|. The part 40 has a convex roller raceway surface 44 and the part 42 has a similar convex surface 46. -Two courses of

conical rollers

48 and 50 are provided, the rollers being retained by a bearing cup 52 having conical roller-engaging surfaces 54 and 56. The two courses of rollers are held in separated positions by roller cages 58 and 60. The end of the axle is provided with a threaded portion 62 to which is secured -a nut 64. 'I'he nut 64 serves to force a retainer sleeve 66 having a. tapered portion 68 into engagement with a correspondingly tapered portion of the cone part 42. The nut 64 is provided with a retainer 10 on its louter end which has a projection 1 2 adapted to engage one of a plurality of holes 14 provided at the axle end.

The bearing cup 52 has a limited clearance for shifting laterally with respect to the journal box by the provision of a ange 16 integral with the journal' box and an inwardly directed flange '|8 on the cover 36. 'I'he journal box has a bearing portion 82 extending between

points

84 and 86, as indicated in Figure 2. y

'I'he large outer ends of the

tapered rollers

48 and 50 abut against thrust shoulders 88 and '90 formed at the edges of the' bearing cup 52. It will be noted that by the removal of the cover plate 36, the nut 64 is accessible for removal from the axle and that the entire roller bearing assembly may be moved outward from the journal box after the nut 64 has been removed. A l

Two courses of 'concave rollers |08 are employed, retained by separate cages I I0. The rollin a groove of the journal box 28 and retained by fastening bolts II4. The inner bearing cone |00 has a tapered bore I6 at eachv end. One end of 'the cone is adapted to seat upon the conical portion H8 of the axle 20 and the other tapered end of the cone l08 is adapted to be engaged by the tapered ends of the twopart retainer sleeve |28. Th retainer sleeve parts |20 fit upon the cylindrical portion |22 of the axle and have annular shoulders lZll at their outer ends fitting into an annular groove |26 formed in nut member |28 which is threaded to the axle end. The nut |28 has secured thereto alock ring |30 having a plurality of notches |32 adapted to be engaged by bolts |36 which thread into the axle end. 'I'he bolts |132 are fastened together by a.

lock wire |36.

The nut |28 is therefore utilized for forcing the two-part sleeve |20 into assembled positions thereby tightening the bearing cone |00 on the axle end. By removing the nut, the Sleeve parts l2"0. The retainer sleeve parts |20 fit upon the cone |00 so that it may be easily slipped from the end of the axle.

Figure 5 illustrates a construction in general similar to that shown in Figure 3 but having a modified roller bearing assembly. The cone |40 is formed similar to the cone |00 in Figure 3 and has a spherical roller raceway |62. Three courses of concave rollers Mill, |bl6 and |48 are employed, the outer courses ldd and |48 running on the complementary surfaces of bearing cup members `|50 and |52 while the middle course of rollers run on the central bearing cup element |58. The bearing cup elements are held together by the retainer sleeve |56 anged over at its edges as at |58. A single roller cage |68 is employed having perforations or apertures for retaining and guiding the three courses of rollers. Wardly projecting lugs |62 between the rollers forming the middle course, which lugs extend into close proximity to the surface of cone |80 thereby guiding the roller cage to run concentrically in the bearing.

Due to the provision of a single cage for all three courses of rollers, it is necessary that the rollers be of proportionate diameters to the size of the cone diameter around which they rotate and for this reason the diameter of the middle course of rollers |46 is proportionately larger than the diameter of the end rollers |44 and |48. Also the end rollers |86 and |48 are tapered, having smaller diameters at their outer ends than at their inner ends. t '.vill further be noted that the end rollers |86 have conical inner ends |64 adapted to abut the ends of the rollers |46 while the rollers |48 have similar conical inner faces |66 abutting the adjacent ends of the rollers |46.

The journal box 28 which rests upon the roller bearing assembly is separated therefrom by a layer of insulating material |68 which may also be of a resilient nature for the purpose of absorbing vibrations and shocks between the weightcarrying journal box and the axle. The roller bearing assembly may be inserted and removed in the same manner as previously described Iwith respect to the form shown in Figure 3.

Figure 6 shows a further modification of the roller bearingfl assembly comprising acone |10 having a sph rical raceway |12 upon which run three courses tof rollers |14, |16 and |18. Each of the rollers \has a central portion |80 of concave shape for running on the spherical surface |12 while the end portions |82 of the rollers 14 and |18 are conically shaped to engage the complementary surfaces of the bearing cup rings |84 and |86. The end portions of the central course of rollers |16 are cylindrically formed, as shown at |88, for running on the at surf@ Q f Hl@ 9611' The cage |60 has in-l tral bearing cup ring l 90. The bearing cup rings are held in assembled position by the retainer sleeve l92.

The cage of this bearing assembly is a unitary element |96. The ends of the roller cage run in close proximity to the cylindrical surfaces |96 at the outside edges ofthe rings |84 and |86. The rollers are of such proportionate diameters that they all have the same peripheral speed around the bearing cone during operation. It willbe obvious that this roller bearing assembly, the same as in Figures 3 and 5, is self-aligning to compensate for axle deflection.

Figure 1 shows a double roller race bearing and a spherically surfaced cone 200. Two courses of diagonally disposed rollers 202 abut each other at their large ends and run upon the surfaces of cup rings 206. The cup rings 20d are retained by the anged casing 206. A single unitary cage 208 is employed for positioning the rollers. The rollers are formed similar to the rollers shown in Figure 6 by havingconcave central portions and conical end portions. The bearing assembly is self-aligning.

In the constructions described the roller bearing unit is mounted upon the axle in an improved manner by employing wedging means acting at the opposite ends of the bearing cone. This arrangement is more desirable than former designs in which the roller bearing is fixed in position by a single wedge forced on the axle by a nut threaded to the axle end. In the construction disclosed the wedging means at both ends of the bearing cone act to produce an even distribution of load upon the surface of the bearing cone.

It is to be understood that We do not wish to be limited to the exact embodiment of the device shown, which is merely by way of illustration and not limitation, as various other forms of the device will of course be apparent to those skilled in the art without departingfromthe spirit of the invention as ascertained from the scope of the appended claims.

We claim:

l. In a wheel and axle assembly, a rotatable wheeled laxle having a journal end, a journal box into which the journal end of said axle extends, a roller bearing unit positioned in said journal box concentric with the journal end of said axle for transmitting the radial load from said journal box to said axle and comprising inner and outer race ringsl and two roller 'courses designed to provide self-alignment between said race rings and to transmit axial thrust in either direction from said axle to said journal box, said inner race ring having a tapered bore at each end thereof, said journal end of said axle having' a tapered wedge shoulder thereon adapted to engage the tapered bore at one end of said inner race ring, a pair of segmental Wedge members adapted to engage the outer end of the tapered bore of said inner race ring and a nut threaded to the journal end of said axle having interlocking engagement with said Wedge members for forcing said wedge members longitudinally with respect to said axle to iixedly position the inner race ring of said roller bearingunit upon said axle.

2. In a. wheel and axle assembly, a rotatable F .wheeled axle having a journal end, a journal box into which the journal end of said axle extends, a roller bearing unit positioned in said journal box concentric with the journal end of said axle for transmitting the radial load from said jourrace ring, a pairof segmental wedge members adapted to engage the outer end of the tapered bore of said inner race ring and a nut threaded to the journal end of said axle having interlocking'engagement with said wedge members for forcing said wedge members longitudinally with respect to said axle to xedly position the inner race ring of said roller bearing unit upon said axle, said outer race ring being free to move for a limited amount laterally with respect to said journal box and a segmental metal key `removably fastened to said journal box for limiting the displacement of said outer hrace ring.

3. In a wheel and axle assembly, the combination of a rotatable wheeled axle having an outwardly facing wedge-shaped annular shoulder thereon adjacent one end, a journal box adapted to receive said end of the axle, a roller bearing assembly disposed between saidA axle and journal box, said assembly including a bearing cone having a tapered bore at each end, said assembly being disposed on said axle whereby the tapered bore at one end of said bearing cone abuts said axle shoulder, wedge means tting said axle adapted to engage the tapered bore at the outer end of said bearing cone, adjustable means secured to saidY axle for moving said wedge means with respect to said axle to ilxedly position said bearing cone on said axle, said assembly further including an outer bearing cup disposed in supporting relation with the journal box, and stop means on said journal box cooperating with said bearing cup to permit limited relative lateral movement of said assembly and journal box.

4. In a wheel and axle assembly, the combi- A nation of a rotatable wheeled axle having an outwardly facing wedge-shaped annular shoulder thereon adjacent one end, va journal box adapted to receive said end of the axle, a. roller bearing assembly disposed between said axle and journal box, said assembly being constructed and arranged to provide for self-alignment upon relative angular movement of said axle and journal box, 'said assembly including a bearing cone having a tapered bore at each end, said assembly being disposed on said axle whereby the tapered bore at one end of said bearing cone abuts said axle shoulder, wedge means fitting said axle adapted to engage the tapered bore at the outer end of said bearing cone, adjustable means secured to said axle for moving said wedge means with respect to said axle to fixedly position said bearing cone on said axle, said assembly further including an outer bearing cup disposed in supporting Arelation with the journal box, and stop means on said journal box cooperating with said bearing cup to permitv limited relative lateral movement of said assembly and journal box.

5. In a wheel and axle assembly, the combination of a rotatable wheeled axle having an outing disposed on said axle whereby the tapered bore at one end of said bearing cone abuts said axle shoulder, wedge means fittingv said axle adapted to engage the tapered bore at the outer end of said bearing cone, adjustable means secured to said axle for moving said wedgek means with respect to said axle to fixedly position said l bearing cone on said axle, said assembly further including an outer bearing cup disposed in supporting relation with the journal box, said assembly being constructed and arranged to provide for self-alignment upon relative angularv movement of said a xle and journal box.

6. In a wheel and axle assembly, the combination of a rotatable wheeled axle having an outwardly facing wedge-shaped annular shoulder thereon adjacent one end, a journal box adapted to receive said end of the axle, a roller bearing assembly disposed between said axle and journal box, said assembly including a bearing cone having a tapered bore at each end, said assembly being disposed on said axle whereby the tapered bore at one end of said bearing cone abuts said axle shoulder, wedge means fitting said axle adapted to engage the tapered borelat the outer end of said bearing cone, adjustable means secured to said axle for movi/ng said wedge means with respect to said axle to fixedly position said bearing cone on said axle, said assembly further including an outer'bearing cup disposed in supporting relation with the journal box, said journal box having a removable closure member for removal or adjustment of said assembly without removal of said journal box from said axle.

7 In a wheel and axle assembly, the combination of a rotatable wheeled axle having an out'- wardly facing wedge-shaped vannular shoulder thereon adjacent one end, a journal box adapted to receive said end of the axle, a roller bearing assembly disposed between said axle and journal box,v said assembly including a bearing cone having a tapered bore at each end, said assembly be- ,to engage the tapered bore at the outer end of said bearing cone, adjustable means secured to .said axle for moving said wedge means with respect to said axle to flxedly position said bearingA cone on said axle, said assembly further including an outer bearing cup disposed in supporting relation with the journal box, and stop means on said journal box cooperating with said bearing cup to permit limited relative lateral movement of said assembly and journal box, said journal box having a removable closure member for removal or adjustment of lsaid assembly without removal of said journal box from said axle.

8. In a wheel and axle assembly, the`combination of a rotatable Wheeled axle having an outwardly facing Wedge-shaped annular shoulder thereon adjacent one end, a journal box adapted to receive said end of the axle, a roller-bearing assembly disposed between said axle and journal box, said assembly being constructed and arranged to provide for self-alignment upon-relative angular movement of said axle and journal box, said assembly including a bearingcone having a tapered bore at each end, said assembly being disposed on said axle whereby the tapered bore at one end of ,said bearing cone abuts said axle shoulder, wedge means tting said axle adapted to engage the tapered bore at the outer end of said bearing cone, adjustable means secured to said axle for moving said wedge means with respect to said axle to xedly position said bearing cone on said axle, said assembly further including an outer bearing cup disposed in supporting relation with the journal box, and stop means on said journal box cooperating with said bearing cup to permit limited relative lateral movement of said assembly and journal box, said journal box having a removable closure member for removal or adjustment of said assembly without removal of said journal box from said axle.

9. In a Wheel and axle assembly, the combination of a rotatable Wheeled axle having an outwardly facing wedge-shaped annular shoulder thereon adjacent'one end, a journal box adapted to receive said end of the axle, a roller bearing assembly disposed between said axle and journal box, said assembly including a bearing cone having a tapered bore at each end, said assembly being disposed on said axle whereby the tapered bore at one end of said bearing cone abuts said axle shoulder, wedge means tting said axle adapted to engage the tapered bore at the outer end of said bearing cone, adjustable means secured to said axle for moving said Wedge means With respect to said axle to fixedly position said bearing cone on said axle, said assembly further including an outer bearing cup disposed in supporting relation with the journal box, said assembly being constructed and arranged to provide for self-alignment upon relative angular movement of said axle and journal box, said journal box having a removable closure member for removal or adjustment of said assembly Without removal of said journal box from said axle.

10. In a wheel and axle assembly, the combination of a rotatable wheeled axle having an outwardly facing wedge-shaped annular shoulder thereon adjacent one end, a journal box adapted to receive said end of the axle, a roller bearing assembly disposed between said axle and journal box, said assembly including a bearing cone having a part provided with a tapered bore at one end engaging with said axle shoulder, a part mounted on said first-named part and being proy vided with a tapered bore, said parts having roller cooperating surfaces, wedge means iltting said axle adapted to engage the tapered bore of said last-named part, adjustable means secured to said axle for moving 'said wedge means with respect to said axle to xedly position said bearing cone on said axle, said assembly further including an outer bearing cup disposed in supporting relation with the journal box, and rollers disposed between said cup and cooperating with the surfaces of said parts.

l1. In a wheel and axle assembly, the combination of a rotatable Wheeled axle having an outwardly facing wedge-shaped annular shoulder thereon adjacent one end, a journal box adapted to receive said end of the axle, a roller bearing assembly disposed between said axle and journal box, said assembly including a bearing cone having a part provided with a tapered bore at one end engaging with said axle shoulder, a part mounted on said first-named part and being provided with a tapered bore, said parts having roller cooperating surfaces, wedge means iittlng said axle .adapted to engage the tapered bore of said last-named part, adjustable means secured to said axle for moving said wedge means with respect to said axle to flxedly position said bearing cone on said axle, said assembly further including an outer bearing cup -disposed in supporting relation withthe journal box, rollers disposed between said cup and cooperating with the suramines faces of said parts, and stop means on said journal box cooperating with said cup to permit limited relative lateral movement of said assembly and journal box.

12. In a wheel and axle assembly, the combinav tion of a rotatable wheeled axle having an outwardly facing wedge-shaped annular shoulder thereon adjacent one end, a journal box adapted to receive said end of the axle, a roller bearing assembly disposed between'said axle and journal box, said assembly being constructed and arranged to provide for self-alignment upon relative angular movement of said axle and journal box, said assembly including a bearing cone having a part provided with a tapered bore at one end engaging with said axle shoulder, a part mounted on said first-named part and being provided With a tapered bore, said parts having roller cooperating surfaces,'wedge means fitting said axle adapted to engage the tapered bore of said last-named part, adjustable means secured to said axle for moving said wedge means with respect to said axle to fixedly position said bearing cone on said axle, said assembly further including an outer bearing cup disposed in supporting relation with the journal box, and rollers disposed between said cup and cooperating with the surfaces of said parts.

13. In a wheel and axle assembly, the combination of a rotatable Wheeled axle having an outwardly facing wedge-shaped annular shoulder thereon adjacent one end, a journal box adapted to receive said end of the axle, a. roller bearing assembly disposed between said axle and journal box, said assembly including a bearing cone having a part provided with a tapered bore at one end engaging with said axle shoulder, a part mounted on said first-named part and being provided with a tapered bore, said parts having roller cooperating surfaces, Wedge means fitting said axle adapted to engage the tapered bore of said last-named part, adjustable means secured to said axle for moving said wedge means with respect to said axle to xedly position said bearing cone on said axle, said assembly further including an outer bearing cup disposed in supporting relation with the journal box, rollers disposed between said cup and cooperating with the surfaces of said parts, said journal box having a removable closure member for removal or adjustment of said assembly without removal of said journal box from said axle.

14. In a wheel and axle assembly, the combination of a rotatable wheeled axle having an outwardly facing wedge-shaped annular shoulder thereon adjacent one end, a journal box adapted to receive said end of the axle, a roller bearing assembly disposed between said axle and journal box, said assembly including a bearing cone having a part provided with a tapered bore' at one end engaging with said axle shoulder, a part mounted on said rst-named part and being provided with a tapered bore, said parts having roller cooperating surfaces, wedge means fitting said axle adapted to engage the tapered bore of said last-named part, adjustable means secure to said axle for moving said wedge means with respect to said axle to xedly position said bearing cone on `said axle, said assembly further including an outer bearing cup disposed in supporting relation with the journal box, rollers disposed between said cup and cooperating with the surfaces of said parts, and stop means on said journal box cooperating with said cup to permit limited relative lateral movement of said assembly and journal box, said journal box having a removable closure member for removal or adjustment of said assembly without removal of said journal box from said axle.

'15. In a wheel and axle assembly, the-combination of a rotatable wheeled axle having an outwardly facing wedge-shaped annular shoulder thereon adjacent one end, a journal box adapted to receive said end of the axle, a roller bearing assembly disposed between said axle' and journal box, said assembly including a bearing cone having a part provided with a tapered bore at one end .engaging with said axle shoulder, a part mounted on said lfirst-named part and being provided with a tapered bore, said parts having roller cooperating surfaces, wedge means fitting said axle adaptedto engage the tapered bore of rsaid last-named part, adjustable means secured to an outer bearing cup disposed in supporting relation with the journal box, rollers disposed between said cup and cooperating with the surfaces of said parts, and stop means on said journal box cooperating with said cup to permit limited relative lateral movement of said assembly and journal box, said journal box having a removable closure member for removal or adjustment of said assembly without removal of said journal box from said axle. A

16. In a roller bearing assembly, the combination of radially spaced race members, a central course of rollers disposed therebetween for carrying radial load, and courses of rollers on each side of said central course for taking lateral thrust, said rollers being disposed in abutting relation, said rollers having an arcuate surface cooperating with a complementary surface on one of said race members and plane surfaces cooperating with complementary surfaces on the other of said race members.

17. In a roller bearing assembly, the combination of radially spaced race members, a central course of rollers disposed therebetween for carrying radial load, and courses of rollers on each side' ofsaid central course fortaking lateral thrust, said rollers being disposed `in abutting relation, each of said rollers having a central arcuate surface cooperating with a complementary surface on the inner of said race members and plane surfaces on each side thereof cooperating with complementary surfaces on the outer of said race members.

18. In a roller bearing assembly, the combination of' radially spaced race members, a central course of' rollers disposed therebetween for carrying radial load, and courses of rollers on each side of said central course for taking lateral thrust, each of the rollers of said last-named course having a conical rolling portion in contact with a roller of said-central course, said rollers having an arcuate surface cooperating with a complementary surface on one of said race members and plane surfaces cooperating with complementary surfaces on the other of said race members.

19. In a Vroller bearing assembly, the combination of radially spaced race members, a central y ing radial load, and courses of rollers on each side of said central course for taking lateral thrust, each of the rollers of said last-named course having a conical rolling portion in contact with a roller of said central course, said rollers having an arcuate surface cooperating with a complementary surface on one of said race members and plane surfaces cooperating with complementary surfaces on the other of said race members, and

a single cage for said courses of rollers.

20. In a roller bearing assembly, the combination of radially spaced race members, a central course of rollers disposed therebetween for carrying radial load, and courses of rollers on each side of said central course for taking lateral thrust, each of the rollers of said last-named courses having rolling contact with a roller ofsaid central course, said rollers having an arcuate surface cooperating with a complementary surface on one of said race members and plane surfaces cooperating with complementary surfaces on the other of said race members,l and a single cage for said courses of rollers having the ends thereof in close proximity to one of said race members for lguiding said rollers.

21. In a roller bearing assembly, the combination of radially spaced race members, a centralA course of rollers disposed therebetween for carrying radial load, and courses of rollers on each side of said central course for taking lateral thrust, each of the rollers of said last-named course having rolling contact with a roller of said central course, said rollers having an arcuate surface cooperating with a complementary surface on one of saidrace members and plane surfaces cooperating with complementary surfaces on the other of said race members, and a single cage for said courses of rollers having the ends thereof in close proximity to the outer of said race members for guiding said rollers. 22. In a roller bearing assembly, the combination of radially spaced race members, two courses of rollers disposed between said members, the rollers of said courses having abutting end rolling contact, said rollers having an arcuate surface cooperating with a complementary surface on one of said race members and plane surfaces cooperating with complementary surfaces on the other of said race members, and a cage for said courses of rollers, said cage having a central part in close proximity to the inner of said race members and having its ends in close proximity to the outer of said race members.

23. In a roller bearing assembly, the combination of radially spaced race members, two courses of rollers disposed between said members, the rollers of said courses having abutting end rolling contact, each of said rollers having a central arcuate surface cooperating with a complementary surface on the inner of said race members and plane surfaces on each side thereof cooperating with complementary surfaces on the outer of said race members, and a cage for said courses of rollers, said cage having a central part in close proximity to the inner of said race members and having its ends in close proximity to the outer of said race members.`

ALFRED H. OELKERSL FRED E. BACHMAN.

CERTIFICATE OF CORRECTION.

Patent No. 2,071,945. February 25, 1937.,

ALFRED H. OELKERS, ET AL.

1t is hereby certified that error appears in the printed specification 'of the above numbered patent requiring Correction as follows: Page 2,

first column, line 18, strike out the period and Words The retainer sleeve parte 120 fit upon the" and insert instead are pulled out thereby releasing the bearing; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office,

Signed and sealed this 27th day of April, A. D. 1937.

Leslie Frazer l(maal) Acting Commissioner of Patents.