US3623581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overrunning device
Assignee: Individual
•
Filing: 1970-09-14
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Granted: 1971-11-30
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Expires: 1990-09-14
Abstract
Abstract Herein disclosed is a cam and roller-type of overrunning device which may be used as either a clutch or brake. The device includes a full compliment of interspersed long and short rollers and a cam whose cam faces each have a composite contour for camming the rollers which are normally biased toward engagement by tickle springs operating on the long rollers. The composite contour has a constant or decreasing angle of attack for overrun and an increasing angle of attack for engagement with backstops being provided for limiting travel of the rollers on overrun.
Inventors
- 👤 William G Livezey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:31
CPC Classifications
F; F16; F16D; F16D41/00; F16D41/06; F16D41/064; F16D41/066; F16B; F16B1/00; F16B1/02; F16B1/04; F16D59/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
195 words
In an overrunning device the combination of a cam member, a race member concentric with and rotatable relative to said cam member, an endless continuous train of interspersed short rollers and long rollers whose ends project beyond the ends of said short rollers, all of said rollers being forcible against said race member by said cam member to prevent rotation of said race member relative to said cam member in only one direction whereby said race member is free to overrun said cam member in the opposite direction, biasing means engaging the projection end portions of Said long rollers for biasing all said rollers toward engagement with said race member, and said cam member having a cam face for each of said rollers comprising an approach area and an engagement area which are tangent to each other at an incipient engagement point and wherein said engagement area has an increasing angle of attack with respect to the roller it engages to prevent the relative movement in said one direction and said approach area has a different angle of attack with respect to the engaged roller on relative rotation between said members in the opposite direction.
Claim 2
Dependent Claim
195 words
In an overrunning device the combination of a cam member, a race member concentric with and rotatable relative to said cam member, an endless continuous train of interspersed short rollers and long rollers whose ends project beyond the ends of said short rollers, all of said rollers being forcible against said race member by said cam member to prevent rotation of said race member relative to said cam member in only one direction whereby said race member is free to overrun said cam member in the opposite direction, biasing means engaging the projection end portions of Said long rollers for biasing all said rollers toward engagement with said race member, and said cam member having a cam face for each of said rollers comprising an approach area and an engagement area which are tangent to each other at an incipient engagement point and wherein said engagement area has an increasing angle of attack with respect to the roller it engages to prevent the relative movement in said one direction and said approach area has a different angle of attack with respect to the engaged roller on relative rotation between said members in the opposite direction.
Claim 3
Dependent Claim
125 words
In an overrunning device the combination of a pair of concentrically arranged relatively rotatable members, one of said members having a cylindrical surface, the other of said members having a cam surface facing said cylindrical surface, an endless continuous train of interspersed short rollers and long rollers whose ends project beyond the ends of said short rollers, all of said rollers being forcible against said cylindrical surface by said cam surface to prevent rotation of said one member relative to said other member in only one direction whereby said one member is free to overrun said other member in the opposite direction and biasing means engaging the end portions of said long rollers for biasing all of said rollers toward engagement with said cylindrical surface.
Claim 4
Dependent Claim
125 words
In an overrunning device the combination of a pair of concentrically arranged relatively rotatable members, one of said members having a cylindrical surface, the other of said members having a cam surface facing said cylindrical surface, an endless continuous train of interspersed short rollers and long rollers whose ends project beyond the ends of said short rollers, all of said rollers being forcible against said cylindrical surface by said cam surface to prevent rotation of said one member relative to said other member in only one direction whereby said one member is free to overrun said other member in the opposite direction and biasing means engaging the end portions of said long rollers for biasing all of said rollers toward engagement with said cylindrical surface.
Claim 5
Dependent Claim
43 words
The overrunning device set forth in claim 2 and backstop means fixed to said other member for abutting the projecting end portions of said long rollers to limit the travel of all of said rollers with respect to said other member during overrun.
Claim 6
Dependent Claim
45 words
The overrunning device set forth in claim 2 and said cam surface having a cam face for each of said rollers of composite contour providing an increasing angle of attack with respect to the roller it engages to prevent the relative rotation between said members.
Claim 7
Dependent Claim
36 words
The overrunning device set forth in claim 4 and said composite contour providing a decreasing angle of attack with respect to the roller it engages to provide sufficient clearance with the roller to freely permit overrun.
Claim 8
Dependent Claim
176 words
In an overrunning device the combination of a pair of concentrically arranged relatively rotatable members, one of said members having a cylindrical surface, the other of said members having a cam surface, an endless continuous train of interspersed long and short rollers, all of said rollers being forcible against said cylindrical surface by said cam surface to prevent rotation of said one member relative to said said other member in only one direction whereby said one member is free to overrun said other member in the opposite direction, and said cam surface comprising a composite cam face for each said roller comprising an approach area and an engagement area which are approximately tangent to each other at an incipient engagement point and wherein said engagement area has an increasing angle of attack with respect to the roller it engages to prevent the relative rotary movement in said one direction and said approach area has a different angle of attack with respect to the engaged roller on relative rotary movement of said members in the opposite direction.
Claim 9
Dependent Claim
176 words
In an overrunning device the combination of a pair of concentrically arranged relatively rotatable members, one of said members having a cylindrical surface, the other of said members having a cam surface, an endless continuous train of interspersed long and short rollers, all of said rollers being forcible against said cylindrical surface by said cam surface to prevent rotation of said one member relative to said said other member in only one direction whereby said one member is free to overrun said other member in the opposite direction, and said cam surface comprising a composite cam face for each said roller comprising an approach area and an engagement area which are approximately tangent to each other at an incipient engagement point and wherein said engagement area has an increasing angle of attack with respect to the roller it engages to prevent the relative rotary movement in said one direction and said approach area has a different angle of attack with respect to the engaged roller on relative rotary movement of said members in the opposite direction.
Claim 10
Dependent Claim
28 words
The overrunning device set forth in claim 6 and lubricant retention means for retaining a liquid lubricant between said members to maintain said rollers substantially submerged in lubricant.
Claim 11
Dependent Claim
58 words
The overrunning device set forth in claim 6 and said approach area having a decreasing angle of attack with respect to the roller it engages to freely permit overrun of said one member relative to said other member, said approach area further having a fillet connecting said approach area to the engagement area of the adjacent cam face.
Claim 12
Dependent Claim
42 words
The overrunning device set forth in claim 8 and backstop means fixed to said other member for abutting the projecting end portions of said long rollers to prevent all of said rollers from contacting the junctures of said cam faces during overrun.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |