US3559781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring clutch-brake with adjustable stop collar
Assignee: Dana Inc
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Filing: 1968-12-06
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Granted: 1971-02-02
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Expires: 1988-12-06
Abstract
Abstract A stop collar for a clutch brake employs different numbers of slots at opposite edges to receive the end tangs of clutch and brake springs, respectively. Each of the springs is fixed to an output hub at its opposite end. The clutch spring tends to wrap down on an input hub, which it surrounds, in which position the brake spring is out of contact with a frame hub, which it surrounds. Relative rotation between the collar and the output hub will release the clutch spring and engage the brake spring. Slot arrangements with different numbers of slots on opposite ends allow accommodation of springs no matter what the angular spacing between their end tangs.
Inventors
- 👤 Thomas T Brunelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
F; F16; F16D; F16D67/00; F16D67/02; F16D49/00; F16D49/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
255 words
In a clutch-brake which comprises: a frame; input and output means including, respectively input and output hubs rotatable relative to the frame and to each other; a brake hub affixed to the frame; said hubs being coaxial and arranged so that the output hub lies axially intermediate the input and brake hubs; a helical clutch spring wound about at least the input hub and fixed at one end to the output hub; a helical brake spring wound about at least the brake hub and fixed at one end to the output hub; a common stop collar of tubular form engaging the opposite ends of the respective brake and clutch springs, such that relative rotational movement between the stop collar and the output hub in one direction will cause the clutch spring to disengage from the input hub and the brake spring to engage the frame hub and relative motion in the other direction will reverse the action; and the improvement of providing the stop collar with a predetermined number of prefabricated connecting devices for the clutch spring distributed around a selected circumference of the collar and a different number of prefabricated connecting devices for the brake spring distributed around another circumference of the collar, whereby rotational change of collar position permits selection of the approximate angular spacings between the ends of the spring to be attached to the collar from a discrete number of combinations of connecting devices in order to provide optimum spacing of the spring ends to accomplish alternatively clutch engagement and braking.
Claim 2
Dependent Claim
255 words
In a clutch-brake which comprises: a frame; input and output means including, respectively input and output hubs rotatable relative to the frame and to each other; a brake hub affixed to the frame; said hubs being coaxial and arranged so that the output hub lies axially intermediate the input and brake hubs; a helical clutch spring wound about at least the input hub and fixed at one end to the output hub; a helical brake spring wound about at least the brake hub and fixed at one end to the output hub; a common stop collar of tubular form engaging the opposite ends of the respective brake and clutch springs, such that relative rotational movement between the stop collar and the output hub in one direction will cause the clutch spring to disengage from the input hub and the brake spring to engage the frame hub and relative motion in the other direction will reverse the action; and the improvement of providing the stop collar with a predetermined number of prefabricated connecting devices for the clutch spring distributed around a selected circumference of the collar and a different number of prefabricated connecting devices for the brake spring distributed around another circumference of the collar, whereby rotational change of collar position permits selection of the approximate angular spacings between the ends of the spring to be attached to the collar from a discrete number of combinations of connecting devices in order to provide optimum spacing of the spring ends to accomplish alternatively clutch engagement and braking.
Claim 3
Dependent Claim
27 words
The clutch-brake of claim 1 in which the prefabricated connecting devices for the respective springs on the collar in each case are slots snugly accommodating the tang.
Claim 4
Dependent Claim
24 words
The clutch-brake of claim 2 in which the prefaBricated connecting devices are slots extending axially inwardly from the opposite ends of the tubular collar.
Claim 5
Dependent Claim
30 words
The clutch-brake of claim 1 in which the prefabricated connecting devices for each of the respective springs on the collar are distributed evenly around their respective circumferences of the collar.
Claim 6
Dependent Claim
25 words
The clutch-brake of claim 4 in which the number of prefabricated connecting devices provided respectively for the spring and the clutch differ by only one.
Claim 7
Dependent Claim
28 words
The clutch-brake of claim 5 in which there are nine prefabricated connecting devices for one spring tang and 10 prefabricated points of attachment for the other spring tang.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |