US3666057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating damper assembly
Assignee: AT&T Inc
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Filing: 1970-12-28
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Granted: 1972-05-30
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Expires: 1990-12-28
Abstract
Abstract A floating damper assembly for applying a constant damping torque to a motor shaft exhibiting substantial runout comprises a flexible cable element, which is anchored at its ends to the motor housing, and a floating damper, which is attached to the cable element substantially at the element''s center, further including an appropriately shaped bushing of frictional material and means for radially loading the bushing against the shaft. The floating damper assembly is particularly useful in an incremental stepping motor whose step profile must remain relatively constant and free of excessive ringing or overshoot.
Inventors
- 👤 Noel Arthur Leifer
- 👤 Eugene Charles Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:39
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/02; F16F7/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A device for applying a constant damping torque to a shaft exhibiting substantial runout, said device comprising: a flexible cable element rigidly anchored at its ends such that a perpendicular line through the center of said cable element passes through the nominal center of rotation of said shaft, and a floating damper attached to said cable element substantially at the element''s center for applying a constant damping torque to said shaft.
Claim 2
Independent Claim
71 words
A device for applying a constant damping torque to a shaft exhibiting substantial runout, said device comprising: a flexible cable element rigidly anchored at its ends such that a perpendicular line through the center of said cable element passes through the nominal center of rotation of said shaft, and a floating damper attached to said cable element substantially at the element''s center for applying a constant damping torque to said shaft.
Claim 3
Dependent Claim
28 words
The device of claim 1 wherein said floating damper further comprises an appropriately shaped bushing of frictional material and means for radially loading said bushing against said shaft.
Claim 4
Dependent Claim
21 words
The device of claim 2 wherein said loading means is an adjustable spring loading means for selecting the desired damping torque.
Claim 5
Dependent Claim
38 words
The device of claim 3 wherein said bushing is a carbon bushing and said shaft contains oppositely sensed helical grooves in contact with said carbon bushing for carrying away residue particles resulting from wear of said carbon bushing.
Claim 6
Dependent Claim
98 words
A floating damper assembly for applying a constant damping torque to a motor shaft exhibiting substantial runout comprising: a flexible cable element rigidly anchored at its ends to the motor housing such that a perpendicular line through the center of said cable element passes through the nominal center of rotation of said shaft, and a floating damper attached to said cable element substantially at the element''s center for applying a constant damping torque to said shaft, said floating damper including an appropriately shaped bushing of frictional material and means for adjustably loading said bushing against said motor shaft.
Claim 7
Dependent Claim
98 words
A floating damper assembly for applying a constant damping torque to a motor shaft exhibiting substantial runout comprising: a flexible cable element rigidly anchored at its ends to the motor housing such that a perpendicular line through the center of said cable element passes through the nominal center of rotation of said shaft, and a floating damper attached to said cable element substantially at the element''s center for applying a constant damping torque to said shaft, said floating damper including an appropriately shaped bushing of frictional material and means for adjustably loading said bushing against said motor shaft.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |