US3727732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque limiting clutch
Assignee: Individual
•
Filing: 1971-04-05
•
Granted: 1973-04-17
•
Expires: 1991-04-05
Abstract
Abstract A coil spring clutch is disclosed incorporating a resilient radially cylindrical member on which the coil spring bears. The torque transmitted by the spring urges the yieldable member to contract so that the clutch will slip at a constant predetermined value of the torque. The yieldable member contracts as a result of the major tensile stresses in the helical spring, making the slip torque substantially independent of large variations in the coefficient of friction of the clutch elements. Also disclosed are means for adjusting the clutch for varying the slip torque.
Inventors
- 👤 W Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:52
CPC Classifications
F; F16; F16D; F16D13/00; F16D13/02; F16D13/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
A torque transmitting device comprising a first rotatable drive means, a second coaxial rotatable drive means having substantially coaxial cylindrical radially elastic means connected thereto and helical means engaging said first drive means and frictionally engaging said elastic means, said elastic means being operatively urged by the torque transmitted between said first and second drive means to yield radially to loosen its frictional engagement with said helical means and decrease the maximum torque transmittable by the device.
Claim 2
Dependent Claim
77 words
A torque transmitting device comprising a first rotatable drive means, a second coaxial rotatable drive means having substantially coaxial cylindrical radially elastic means connected thereto and helical means engaging said first drive means and frictionally engaging said elastic means, said elastic means being operatively urged by the torque transmitted between said first and second drive means to yield radially to loosen its frictional engagement with said helical means and decrease the maximum torque transmittable by the device.
Claim 3
Dependent Claim
18 words
A torque transmitting device according to claim 1 in which said elastic means comprises a longitudinally slit tube.
Claim 4
Dependent Claim
26 words
A torque transmitting device according to claim 1 in which said elastic means comprises a helical member wound in the same direction as said helical means.
Claim 5
Dependent Claim
17 words
A torque transmitting device according to claim 1 in which said elastic means comprises a spring collet.
Claim 6
Dependent Claim
16 words
A torque transmitting device according to claim 1 with means to radially bias said elastic means.
Claim 7
Dependent Claim
28 words
A torque transmitting device according to claim 1 with means engageably acting on one end of said helical means to selectively stop the rotation of the helical means.
Claim 8
Dependent Claim
51 words
A coil spring clutch of the type comprising a driving drum, a driven drum and a coaxial helical spring in frictional engagement therewith, wherein the improvement comprises a substantially torque responsive, radially yielding means limiting the maximum torque capacity of the clutch incorporated in the structure of one of said drums.
Claim 9
Dependent Claim
51 words
A coil spring clutch of the type comprising a driving drum, a driven drum and a coaxial helical spring in frictional engagement therewith, wherein the improvement comprises a substantially torque responsive, radially yielding means limiting the maximum torque capacity of the clutch incorporated in the structure of one of said drums.
Claim 10
Dependent Claim
24 words
A coil spring clutch according to claim 7 with adjustable means biasing said yielding means for varying the maximum torque capacity of the clutch.
Claim 11
Dependent Claim
46 words
A unidirectional coil spring brake of the type comprising a helical spring frictionally engaging a drum, wherein the improvement comprises a torque responsive, radially yielding means for limiting the maximum braking torque capacity incorporated in the structure of said drum to frictionally engage said helical spring.
Claim 12
Dependent Claim
46 words
A unidirectional coil spring brake of the type comprising a helical spring frictionally engaging a drum, wherein the improvement comprises a torque responsive, radially yielding means for limiting the maximum braking torque capacity incorporated in the structure of said drum to frictionally engage said helical spring.
Claim 13
Dependent Claim
26 words
A unidirectional coil spring brake according to claim 9 with adjustable means biasing said yielding means for varying said maximum braking torque capacity of the brake.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |