US729987A - Bearing. - Google Patents

Bearing. Download PDF

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US729987A
US729987A US6480001A US1901064800A US729987A US 729987 A US729987 A US 729987A US 6480001 A US6480001 A US 6480001A US 1901064800 A US1901064800 A US 1901064800A US 729987 A US729987 A US 729987A
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Prior art keywords
treads
shaft
tread
taper
roller
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US6480001A
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William Hamilton Wright
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MARY E WRIGHT
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MARY E WRIGHT
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
    • F16C19/364—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
    • F16C19/386—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F16C19/546—Systems with spaced apart rolling bearings including at least one angular contact bearing
    • F16C19/547—Systems with spaced apart rolling bearings including at least one angular contact bearing with two angular contact rolling bearings
    • F16C19/548—Systems with spaced apart rolling bearings including at least one angular contact bearing with two angular contact rolling bearings in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings
    • F16C33/605—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings with a separate retaining member, e.g. flange, shoulder, guide ring, secured to a race ring, adjacent to the race surface, so as to abut the end of the rolling elements, e.g. rollers, or the cage

Definitions

  • my invention also provides means tofacilitate the setting up of thebearingfforlocking the bearing in adjustmentiand for ex, eluding dust and retaining lubricant.
  • Figure l is a longitudinal section'off'my invention.
  • Fig. 2 is an end elevation, righthand end of Fig. l, the internal parts being removed to show the taper rollers in position
  • Fig. 3 is a detail face view of the washer 2l.
  • -6 6 are ungrooved taper or cone-section rollers which occupy the space between the inner treads and the outer treads.
  • The-taper or slant of the taper rollers and the'taper or slant of the inner treads and the outer treads are such that if their surfaces were lcontinued to form perfect cones ytheir vertices would coincide in the axis of the shaft or axle.
  • the rollers 6 are made to fit the inner and outer treads of the rollerrace by this construction, so that each roller is -in continuous line of contact with the inner and outer tread of its race, and it has both adjustable, as
  • the angle which the outer tread forms with the shaft is a non-reposing angle and the angle which the inner tread forms with the shaft is a reposing angle. If now a reposing angle (wherein the tendency of the taper roller is to feed in and bind) is employed for the inner tread and a non-reposing angle (wherein the tendency of the taper roller is to be forced out) is employed for 'the outer tread, it is evident that such relation of angles may be had that the one tendency is exactly counterbalanced by the other tendency. With this fact in hand I have found what these angles are, and consequently am able to disclose as my discovery a substantially fixed rule or formula for the angles of the parts of a roller-bearing of this class.
  • the general rule is as follows: The surface of the inner tread should form with the axis of the shaft an angle of substantially fourteen degrees. The surface of the outer tread should form with the axis of the shaft an angle of substantially eighteen and one-half degrees, and consequently the interposed taper rollers in order to be full series and full tread must be tapered at substantially four and one-halfdegrees.
  • angles which I have designated above constitute a counterpoise when the bearing is made of steel and run at ordinary speeds attained by vehicles, line-shafting, and the like.
  • the taper rollers 6 For facility in setting up the bearing I provide the taper rollers 6 with pins 7 upon their inner ends. Vit-hin the outer tread 4 and threaded to the cylindrical portion thereof is a retaining-ring 8, which is ilanged,ras shown at 9, to an angle corresponding to the outer tread. This flange sets the ring 8 definitely when screwed to place.
  • the ring S has an annular trough of sufficient depth and width to form a raceway for the pins 7. When the inner tread is removed, the taper rollers 6 Will hang by the pins 7 in the trough of the ring 3, and thus the difficulty of setting up a horizontal bea-ring of this kind is avoided.
  • pins 7 and the raceway in which they travel, above described, perform no other function than that of keeping the taper rollers (i in place while mounting and dismounting the bearing.
  • retaining-rings 10 which take over the outer ends of the rollers G.
  • the rings 10 are screwthreaded to the cylinder extensions of the outer treads and are provided with flanges 1l, which engage with the outer tread the same as the fianges 9 and for the same purpose. It should be noted that both the retaining-rings 3 and 10 must stand free of the rollers 6 when the rollers are doing Work, and they in no sense operate as a cage or race to hold the rollers in position as against end thrust.
  • I provide the adjustable inner tread 3 with a key l2, which prevents its rotation on the shaft 1.
  • the outer portion of the inner tread 3 is threaded internally to receive athreaded ring 13. W'hen the tread 3 is adjusted to place, the key l2 is inserted and the ring 13 is screwed to place against a shoulder on the shaft 1. This prevents the tread 3 from being forced farther inwardly and tightening the bearing.
  • a nut 14 and a washer 15 and a locknut 16 are then set up against the end of the tread 3,'and it is securely locked.
  • the hub is capped by a cap 17 to exclude dust and to hold the lubricant.
  • a set-screw 18 is provided, by the removal of which the bearing may be charged with lubricant.
  • I provide an external washer 19 with an inwardly-projecting portion, which is screw-threaded into the cylinder portion of the outer tread.
  • this inwardly-projecting portion is cut an annular groove, as indicated at 20, to receive a metallic washer 2l, which is slotted across its face, as clearly shown in Fig. 3, so that it may be compressed and sprung in place in the annular groove 20.
  • I preferably clasp about it a broken ring 23, of any suitable spring inaterial, which will tend to press the washer 22 down upon the shaft.
  • a taper roller bearing comprising a smooth, tapering inner tread provided with a roller-surface inclined to the axis of the shaft so as to form an angle of repose, a smooth, tapering outer tread provided with a roller-surface inclined to the axis of the shaft so as to form an angle of non-repose, the inner and outer treads providing a free race between them, and a full series of ungrooved, taper rollers fitted in the free race, held therein from endwise movement by the location of the treads with relation to each other, and having their ends out of contact with any part ICO sovas to be entirely free thereof, substantially as and for the purposes set forth.
  • a taper-roller bearing comprising a pair of smooth, tapering inner treads each provided with a roller-surface inclined to the axis of the shaft so as to forman angle of repose, a pair of smooth, .tapering outer treads each provided with a roller-surface inclined to the axis of the shaft so as to form an angie of non-repose, the inner and outer treads providing free races between them, and full series of ungrooved, taper rollers tted within the free races, held therein from endwise movement by the location of the treads with relation to each other, and having their ends out of contact with any part so as to be entirely free thereof when carrying the load, substantially as and for the purposes set forth.
  • a taper-roller bearing comprising a pair of smooth tapering inner treads each provided with a roller-surface inclined to the axis of the shaft so as to form an angle ofrepose, and adjustable with relation to each other as to distance apart, a pair of smooth, tapering outer treads, each provided with a roller-surface inclined to the axis of the shaft so as to form an angle of non-repose, the inner and outer treads providing free races between them, and full series of ungrooved taper rollers iitted in the free races, held from endwise movement .by the location of the treads with relation to each other, and having their ends out of contact with any part so as to be entirely free thereof when carrying the load, substantially as and for the purposes set forth.
  • a taper-roller bearing in combination with smooth tapering inner treads provided with roller-surfaces inclined to the axis of the shaft so'as to form angles of repose, and smooth tapering outer treads provided with a roller-surface inclined to the axis of the shaft to form angles of non-repose, and full series of ungrooved taper rollers, meansfor adjusting the said bearing, comprising a threaded ring threaded to the inner surface ⁇ of one of the inner treads and bearing against a shoulder on the shaft to hold the said inner tread against further movement toward the opposite inner tread, a nut threaded to the shaft setting against the outer end of said inner tread, and a washer and check-nut for holding the same againstturning, substani tially as and for the purposes set forth.
  • a taper-roller bearing in combination with smoothtapering inner treads provided with roller-surfaces inclined to the axis of the shaft so as to form angles of repose, and smooth tapering outer treads provided with a roller-surface inclined to the axis of the shaft to form angles of non-repose, and full series of ungrooved taper rollers, means for retaining the lubricant in said bearing and for excluding the dust, comprising a washer screw* threaded to one of said outer treads, and inin the county of Erie and State of New York.v

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Description

PATENTED JUNE 2, 1903.
BEARING.
APPLIGATION FILED JUNE 1'1, 1901.
NO MODEL.
july. I
Ihr/2.71%?" HWI/[lam l v pering tread-surfaces 2 and 3.
pof the taper or cone-section type.
Patented une Y2, 1903.
WILLIAM HAMILTON WRIGHT, OF BUFFALO, NEW YORK, ASSIGNOR TO MARY E. WRIGHT, OF BUFFALO, NEW YORK.
.SPECIFICATION foaming part of Letters Application filed-.Tune 17,1901.
.Beit known that' I, WILLIAM HAMILTON .WRIGHT, a-citizen of thev United States, re siding atBu'ffalo,NewYork,l have invented' certain new and usefulImprovements in Bearings, of which the following is a'full, clear,-A and exact description y Y My invention relates to bearings, and particularly to those employing contact-surfaces My invention has for its main objects,- first, the substantial elimination of all sliding friction or end thrust; second, the elimination of all cages or separating devices, and, third, to
provide an improved taper roller self-con-` tained. In connection with these main objects my invention also provides means tofacilitate the setting up of thebearingfforlocking the bearing in adjustmentiand for ex, eluding dust and retaining lubricant.
The above mentioned principal' objects combine to eliminate in thelargest possibleV degree frictional contact within thebearing.v In seeking to obtain theselconditions I 'have discovered by my experiments that their sub stantial attainment can be reached by means of placing certain parts of my bearing at par-N ticular angular relations,` all ofwhich I fully explain and disclose in my specification.
Figure l is a longitudinal section'off'my invention. Fig. 2 is an end elevation, righthand end of Fig. l, the internal parts being removed to show the taper rollers in position Fig. 3 is a detail face view of the washer 2l.
This is a typical use of my invention, and its adaptation to other forms of bearings--V such, for example, as ordinary shaft-bearings, car-journals, bicycles, and the'like-involves the exercise of only ordinary mechanical skill.
lis a shaft. Uponv this shaft are smooth ta- These smooth tapering tread-surfaces are'so inclined to the axis of the shaft 'as -to form an angle of repose, as hereinafter more fully explained, and so as to constitute the inner treads of the bearing. In the drawings herewith the ta# pering inner tread 2 is integral with the'shaft 1, and the tapering inner tread 3 is adjustable thereon longitudinally; but it will be evident that in `other constructions bothta- ING Patent N. 729,987, dated June 2, l1903. serai No. 64,800. (No model.) Y v pering inner treads may be made ,separate Vfrom the shaft and one or desired.
4 4 are smooth tapering treads` provided with roller-surfaces inclined to the axis of the shaft, so as to form an angle often-repose, as herein after more fully described, and so as to constitute the outer treads of the bearing. These outer treads have their inner ends united by means of a sleeve 5 andhave their outer ends turned to cylindrical form and internally threaded to receive the parts hereinafter described.
-6 6 are ungrooved taper or cone-section rollers which occupy the space between the inner treads and the outer treads.
,--I will now describe the peculiar construction of the inner treads and the outer treads and the taper rollers and their relation to each other. The-taper or slant of the taper rollers and the'taper or slant of the inner treads and the outer treads are such that if their surfaces were lcontinued to form perfect cones ytheir vertices would coincide in the axis of the shaft or axle. The rollers 6 are made to fit the inner and outer treads of the rollerrace by this construction, so that each roller is -in continuous line of contact with the inner and outer tread of its race, and it has both adjustable, as
therefore a free-rolling tread over its entirel "that is to say, the races are filled with the rollers, except that sucient space is left between them to prevent their binding or engaging in frictional contact when they are carrying the loadv or pressure exerted upon the bearing. They are free to rotate on their own axes and to travel in the race. 'The full series is clearly shown in Fig. 2.
I will now describe thepeculiar and essen'- tial features of my invention which distinguish it from previous bearings of this class.
I have found that in rolling contact s urfaces or treads of this kind there is a certain angle beyond which the taper roller tends to Ico The angle at or beyond which the taper roller l,
tends to be forced out axially I term a nonreposing angle, and the angle at or below which the taper roller tends to feed in or bind I term a reposing angle. For example, the angle which the outer tread forms with the shaft is a non-reposing angle and the angle which the inner tread forms with the shaft is a reposing angle. If now a reposing angle (wherein the tendency of the taper roller is to feed in and bind) is employed for the inner tread and a non-reposing angle (wherein the tendency of the taper roller is to be forced out) is employed for 'the outer tread, it is evident that such relation of angles may be had that the one tendency is exactly counterbalanced by the other tendency. With this fact in hand I have found what these angles are, and consequently am able to disclose as my discovery a substantially fixed rule or formula for the angles of the parts of a roller-bearing of this class.
The general rule is as follows: The surface of the inner tread should form with the axis of the shaft an angle of substantially fourteen degrees. The surface of the outer tread should form with the axis of the shaft an angle of substantially eighteen and one-half degrees, and consequently the interposed taper rollers in order to be full series and full tread must be tapered at substantially four and one-halfdegrees. Whilesomedeparturefroin these angles may be had and while some variation therefrom may be advisable due to the metal employed or the speed in rotation, I recommend these specific angles, since they constitute a nonreposing angle for the outer tread and a reposing angle for the inner tread and the necessary angle for the taper rollers to constitute a counterbalance or counterpoise where the tendency to thrust in the one direction is exactly overcome by the tendency to bind in the other. The angles which I have designated above constitute a counterpoise when the bearing is made of steel and run at ordinary speeds attained by vehicles, line-shafting, and the like.
For facility in setting up the bearing I provide the taper rollers 6 with pins 7 upon their inner ends. Vit-hin the outer tread 4 and threaded to the cylindrical portion thereof is a retaining-ring 8, which is ilanged,ras shown at 9, to an angle corresponding to the outer tread. This flange sets the ring 8 definitely when screwed to place. The ring S has an annular trough of sufficient depth and width to form a raceway for the pins 7. When the inner tread is removed, the taper rollers 6 Will hang by the pins 7 in the trough of the ring 3, and thus the difficulty of setting up a horizontal bea-ring of this kind is avoided. The
pins 7 and the raceway in which they travel, above described, perform no other function than that of keeping the taper rollers (i in place while mounting and dismounting the bearing.
In order to prevent the taper rollers from jolting out when free from load, I provide retaining-rings 10, which take over the outer ends of the rollers G. The rings 10 are screwthreaded to the cylinder extensions of the outer treads and are provided with flanges 1l, which engage with the outer tread the same as the fianges 9 and for the same purpose. It should be noted that both the retaining-rings 3 and 10 must stand free of the rollers 6 when the rollers are doing Work, and they in no sense operate as a cage or race to hold the rollers in position as against end thrust.
In order to adjust the bearings, I provide the adjustable inner tread 3 with a key l2, which prevents its rotation on the shaft 1. The outer portion of the inner tread 3 is threaded internally to receive athreaded ring 13. W'hen the tread 3 is adjusted to place, the key l2 is inserted and the ring 13 is screwed to place against a shoulder on the shaft 1. This prevents the tread 3 from being forced farther inwardly and tightening the bearing. A nut 14 and a washer 15 and a locknut 16 are then set up against the end of the tread 3,'and it is securely locked. The hub is capped by a cap 17 to exclude dust and to hold the lubricant. A set-screw 18 is provided, by the removal of which the bearing may be charged with lubricant.
To retain the lubricant and exclude the dust from this kind of a bearing, I provide an external washer 19 with an inwardly-projecting portion, which is screw-threaded into the cylinder portion of the outer tread. Upon the inner surface of this inwardly-projecting portion is cut an annular groove, as indicated at 20, to receive a metallic washer 2l, which is slotted across its face, as clearly shown in Fig. 3, so that it may be compressed and sprung in place in the annular groove 20. This leaves an annularareabetween the screwthreaded portion ot' the Washer 1f) and the washer 2l, and in this space I place a lubricant-retaining and dust-excluding Washer,of any desired material, as indicated at 22. In order that this Washer may fit closely down upon the shaft 1, I preferably clasp about it a broken ring 23, of any suitable spring inaterial, which will tend to press the washer 22 down upon the shaft.
I-Iaving thus described my invention and its inode of operation and its adaptation to different uses and Without limiting myself to the particular construction herein shown, What I claim is- 1. A taper roller bearing comprising a smooth, tapering inner tread provided with a roller-surface inclined to the axis of the shaft so as to form an angle of repose, a smooth, tapering outer tread provided with a roller-surface inclined to the axis of the shaft so as to form an angle of non-repose, the inner and outer treads providing a free race between them, and a full series of ungrooved, taper rollers fitted in the free race, held therein from endwise movement by the location of the treads with relation to each other, and having their ends out of contact with any part ICO sovas to be entirely free thereof, substantially as and for the purposes set forth.
2. A taper-roller bearing comprising a pair of smooth, tapering inner treads each provided with a roller-surface inclined to the axis of the shaft so as to forman angle of repose, a pair of smooth, .tapering outer treads each provided with a roller-surface inclined to the axis of the shaft so as to form an angie of non-repose, the inner and outer treads providing free races between them, and full series of ungrooved, taper rollers tted within the free races, held therein from endwise movement by the location of the treads with relation to each other, and having their ends out of contact with any part so as to be entirely free thereof when carrying the load, substantially as and for the purposes set forth.
3. A taper-roller bearing comprising a pair of smooth tapering inner treads each provided with a roller-surface inclined to the axis of the shaft so as to form an angle ofrepose, and adjustable with relation to each other as to distance apart, a pair of smooth, tapering outer treads, each provided with a roller-surface inclined to the axis of the shaft so as to form an angle of non-repose, the inner and outer treads providing free races between them, and full series of ungrooved taper rollers iitted in the free races, held from endwise movement .by the location of the treads with relation to each other, and having their ends out of contact with any part so as to be entirely free thereof when carrying the load, substantially as and for the purposes set forth.
4. In ataper-roller bearing, in combination with smooth tapering inner treads provided with roller-surfaces inclined to the axis of the shaft so as to form angles of repose, and smooth tapering outer treads provided with a roller-surface inclined to the axis of the shaft to form angles of non-repose, and full series of ungrooved taper rollers; means for taking down and setting up the bearing, com-l prising pins on the inner ends'of said taperv rollers, sleeves threaded to the inner ends of the outer treads and provided with annular grooves to receive the y pins on the ends of are free to travel, so that when the shaft and inner treads are removed the taper rollers will be held substantially in place so that the shaft and the inner treads may be" replaced as and for the purposes set forth.
5. In a taper-roller bearing, in combination with smooth tapering inner treads provided with roller-surfaces inclined to the axis of the shaft so'as to form angles of repose, and smooth tapering outer treads provided with a roller-surface inclined to the axis of the shaft to form angles of non-repose, and full series of ungrooved taper rollers, meansfor adjusting the said bearing, comprising a threaded ring threaded to the inner surface `of one of the inner treads and bearing against a shoulder on the shaft to hold the said inner tread against further movement toward the opposite inner tread, a nut threaded to the shaft setting against the outer end of said inner tread, and a washer and check-nut for holding the same againstturning, substani tially as and for the purposes set forth.
6. In a taper-roller bearing, in combination with smoothtapering inner treads provided with roller-surfaces inclined to the axis of the shaft so as to form angles of repose, and smooth tapering outer treads provided with a roller-surface inclined to the axis of the shaft to form angles of non-repose, and full series of ungrooved taper rollers, means for retaining the lubricant in said bearing and for excluding the dust, comprising a washer screw* threaded to one of said outer treads, and inin the county of Erie and State of New York.v
WILLIAM HAMILTON WRIGHT.
Witnesses:
M. E. SNYDER, A. W. PLUMLEY.
US6480001A 1901-06-17 1901-06-17 Bearing. Expired - Lifetime US729987A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2990223A (en) * 1955-06-06 1961-06-27 Best Frank Ellison Tapered roller bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2990223A (en) * 1955-06-06 1961-06-27 Best Frank Ellison Tapered roller bearing

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