Patent US3835973A successfully refreshed from Google Patents.
US3835973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque limiting device
Assignee: Wellman Bibby Co Ltd
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Filing: 1972-09-25
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Granted: 1974-09-17
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Expires: 1992-09-25
Abstract
Abstract In a torque limiting device, torque is transmitted between first and second coaxial torque members by a rolling element. The rolling element is seated in a seating in the first torque member and located in an aperture in the second torque member. The rolling element is held in its seating by a cam surface on a locking member and on overload, is movable in the aperture out of the seating by moving the locking member in a circumferential direction against a resilient bias.
Inventors
- 👤 G Braggins
- 👤 D Pooley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:44
CPC Classifications
F; F16; F16D; F16D43/00; F16D43/02; F16D43/20; F16D43/202; F16D43/204; F16D43/208
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
A torque limiting device comprising a first torque member having a seating and a second torque member coaxial with said first torque member having an aperture, at least one rolling element seated in said seating and located in said aperture, a locking member carrying at least one cam surface and resilient biasing means resiliently holding said cam surface in contact with said locking member at torque values below a predetermined value, said rolling element being movable in said aperture out of said seating by moving said locking member in a circumferential direction against said biasing means on overload of said device.
Claim 2
Dependent Claim
101 words
A torque limiting device comprising a first torque member having a seating and a second torque member coaxial with said first torque member having an aperture, at least one rolling element seated in said seating and located in said aperture, a locking member carrying at least one cam surface and resilient biasing means resiliently holding said cam surface in contact with said locking member at torque values below a predetermined value, said rolling element being movable in said aperture out of said seating by moving said locking member in a circumferential direction against said biasing means on overload of said device.
Claim 3
Dependent Claim
17 words
The device of claim 1 in which an input drive is connected to said second torque member.
Claim 4
Dependent Claim
43 words
The device of claim 1 in which said device has three of said rolling elements spaced around the axis of said device and said locking member is a ring which is located radially by co-operation between said cam surfaces and said rolling elements.
Claim 5
Dependent Claim
23 words
The device of claim 1 in which said cam surface is formed by a roller held in a pocket in said locking member.
Claim 6
Dependent Claim
19 words
The device of claim 1 including means limiting relative rotation between said second torque member and said locking member.
Claim 7
Dependent Claim
17 words
The device of claim 5 in which said limiting means comprises ramps on said second torque member.
Claim 8
Dependent Claim
13 words
The device of claim 1 in which said rolling element is a roller.
Claim 9
Dependent Claim
67 words
The device of claim 1 in which said locking member is resiliently biased by an axial spring force, the resilient biasing means including a pair of cam surfaces located one on said locking member and the other on said second torque member, which bear against each other to prevent relative rotation between said locking member and said second torque member at torque values below said limiting value.
Claim 10
Dependent Claim
19 words
The device of claim 8 including axial spring pockets in said locking member and springs in said spring pockets.
Claim 11
Dependent Claim
54 words
The device of claim 1 including radial spring pockets in said locking member, a spring in each of said spring pockets, detent seatings in said second torque member and a detent ball at one end of each of said springs which, in the engaged position of said device, is seated in said detent seating.
Claim 12
Dependent Claim
106 words
The device of claim 2, in which said device has three of said rolling elements in the form of rollers spaced around the axis of said device, said locking member being a ring which is located radially by cooperation between said cam surface and said rollers, in which the resilient biasing means comprises spring pockets, springs located in said spring pockets and a pair of cam surfaces located one on said locking member and the other on said second torque member, which bear against each other to prevent relative rotation between said locking member and said second torque member at torque values below said limiting value.
Claim 13
Dependent Claim
101 words
The device of claim 2, in which said device has three of said rolling elements in the form of rollers spaced around the axis of said device, said locking member being a ring which is located radially by cooperation between said cam surface and said rollers, in which the resilient biasing means comprises radial spring pockets in said locking member, a spring in each of said spring pockets, detent seatings in said second torque member and a detent ball at one end of each of said springs, which, in the engaged position of said device, is seated in said detent seating.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |