Patent US3713712A successfully refreshed from Google Patents.
US3713712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow ended bearing roller
Assignee: Rollway Bearing Co Inc
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Filing: 1971-03-29
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Granted: 1973-01-30
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Expires: 1991-03-29
Abstract
Abstract A hollow ended roller element for use in radial and thrust bearings, the roller being crowned and formed with cavities in both terminal planes. The configuration of the cavities is such that unequal forces created by an excessive misalignment are more evenly distributed whereby the useful life of the bearing is extended.
Inventors
- 👤 W Derner
- 👤 H Stewart
- 👤 L Root
- 👤 R Goodelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:47
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/30; F16C33/34; F16C23/00; F16C23/06; F16C23/08; F16C23/088; F16C2240/00; F16C2240/40; F16C2240/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
An anti-friction roller element for use in a bearing, the roller element having a substantially cylindrical rolling surface and opposite end faces disposed in perpendicular relation to the longitudinal axis of the roller, the roller being formed with a crown portion adjacent each end whereby the diameter of each end face is less than the maximum diameter of the roller, the length of each crown portion being less than 25% of the roller length, and wherein the roller end faces are formed with centrally disposed cavities having a depth approximately equal to the length of the crown portions, the diameter of each cavity at the roller end face being from 50-59 percent of the maximum diameter of the roller.
Claim 2
Dependent Claim
119 words
An anti-friction roller element for use in a bearing, the roller element having a substantially cylindrical rolling surface and opposite end faces disposed in perpendicular relation to the longitudinal axis of the roller, the roller being formed with a crown portion adjacent each end whereby the diameter of each end face is less than the maximum diameter of the roller, the length of each crown portion being less than 25% of the roller length, and wherein the roller end faces are formed with centrally disposed cavities having a depth approximately equal to the length of the crown portions, the diameter of each cavity at the roller end face being from 50-59 percent of the maximum diameter of the roller.
Claim 3
Dependent Claim
119 words
An anti-friction roller element for use in a bearing, the roller element having a substantially cylindrical rolling surface and opposite end faces disposed in perpendicular relation to the longitudinal axis of the roller, the roller being formed with a crown portion adjacent each end whereby the diameter of each end face is less than the maximum diameter of the roller, the length of each crown portion being less than 25% of the roller length, and wherein the roller end faces are formed with centrally disposed cavities having a depth approximately equal to the length of the crown portions, the diameter of each cavity at the roller end face being from 50-59 percent of the maximum diameter of the roller.
Claim 4
Dependent Claim
119 words
An anti-friction roller element for use in a bearing, the roller element having a substantially cylindrical rolling surface and opposite end faces disposed in perpendicular relation to the longitudinal axis of the roller, the roller being formed with a crown portion adjacent each end whereby the diameter of each end face is less than the maximum diameter of the roller, the length of each crown portion being less than 25% of the roller length, and wherein the roller end faces are formed with centrally disposed cavities having a depth approximately equal to the length of the crown portions, the diameter of each cavity at the roller end face being from 50-59 percent of the maximum diameter of the roller.
Claim 5
Dependent Claim
103 words
An anti-friction roller element for use in a bearing, the roller element having a substantially cylindrical rolling surface and opposite end faces disposed in perpendicular relation to the longitudinal axis of the roller, the roller being formed with a crown portion adjacent each end whereby the diameter of each end face is less than the maximum diameter of the roller, the length of each crown portion being in the range of 15-20% percent of the length of the roller, and wherein the roller end faces are formed with centrally disposed cavities having a depth approximately equal to the length of the crown portions.
Claim 6
Dependent Claim
103 words
An anti-friction roller element for use in a bearing, the roller element having a substantially cylindrical rolling surface and opposite end faces disposed in perpendicular relation to the longitudinal axis of the roller, the roller being formed with a crown portion adjacent each end whereby the diameter of each end face is less than the maximum diameter of the roller, the length of each crown portion being in the range of 15-20% percent of the length of the roller, and wherein the roller end faces are formed with centrally disposed cavities having a depth approximately equal to the length of the crown portions.
Claim 7
Dependent Claim
143 words
In an anti-friction bearing, a roller element having a subsTantially cylindrical rolling surface and opposite end faces perpendicular to the longitudinal axis of the roller, the roller being formed with a crown portion adjacent each end, the length of each crown portion being from 15 to 20 percent of the roller length, the end faces of the roller being formed with centrally disposed cavities having curvilinear walls, the diameter of each cavity at the roller end face being from 55 to 59 percent of the maximum diameter of the roller and the depth of each cavity on the longitudinal axis of the roller being from 0.8 to 1.2 times the length of a crown portion, and wherein the configuration of the cavity walls is such that the roller in the areas of the cavities has a stress concentration factor of less than 2.
Claim 8
Dependent Claim
143 words
In an anti-friction bearing, a roller element having a subsTantially cylindrical rolling surface and opposite end faces perpendicular to the longitudinal axis of the roller, the roller being formed with a crown portion adjacent each end, the length of each crown portion being from 15 to 20 percent of the roller length, the end faces of the roller being formed with centrally disposed cavities having curvilinear walls, the diameter of each cavity at the roller end face being from 55 to 59 percent of the maximum diameter of the roller and the depth of each cavity on the longitudinal axis of the roller being from 0.8 to 1.2 times the length of a crown portion, and wherein the configuration of the cavity walls is such that the roller in the areas of the cavities has a stress concentration factor of less than 2.
References Cited (Backward Citations)
US1572725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |