Patent US4232768A successfully refreshed from Google Patents.
US4232768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic emergency brake
Assignee: Individual
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Filing: 1978-05-01
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Granted: 1980-11-11
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Expires: 1998-05-01
Abstract
Abstract An improved brake for winches. The brake has a main brake and an emergency brake. Both brakes are solenoid operated and brake when the power is turned off or fails. Means are provided for slightly delaying the operation of the emergency brake compared to the main brake so that the braking force is applied in stages in an emergency. The brakes are mechanically linked together so that either of the main or emergency solenoids operate both brakes if one of the solenoids fails.
Inventors
- 👤 Jacques Dufresne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:31
CPC Classifications
F; F16; F16D; F16D59/00; F16D59/02; B; B66; B66D; B66D5/00; B66D5/02; B66D5/06; B66D5/08; B66D5/24; B66D5/30; F16D49/00; F16D49/16; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/54; F16D66/00; F16D66/02; F16D66/021; F16D66/022; F16D66/023; F16D2121/00; F16D2121/18; F16D2121/20; F16D2121/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
185 words
An improved brake for a rotatable member mounted on a frame, comprising: first and second support means mounted on the frame on both sides of the rotatable member, each support means carrying a brake and including means for pivotably attaching one of its ends to the frame, means for loosely attaching its other end to the frame, and means for mounting the brake on it intermediate its ends; means on each support means for moving it relative to the frame to brake the rotatable member, said moving means comprising first and second brake frames pivotably connected to the support means at the loosely attached ends thereof, spring means positioned between the brake frames and the support means for moving them apart to brake, and means for normally retaining the brake frames and support means together, against the force of the spring means, in a non-braking position; and means for mechanically connecting the two support means together through the brake frames so that both of the brakes be operated by movement of only one of the support means if one of the moving means has failed.
Claim 2
Dependent Claim
185 words
An improved brake for a rotatable member mounted on a frame, comprising: first and second support means mounted on the frame on both sides of the rotatable member, each support means carrying a brake and including means for pivotably attaching one of its ends to the frame, means for loosely attaching its other end to the frame, and means for mounting the brake on it intermediate its ends; means on each support means for moving it relative to the frame to brake the rotatable member, said moving means comprising first and second brake frames pivotably connected to the support means at the loosely attached ends thereof, spring means positioned between the brake frames and the support means for moving them apart to brake, and means for normally retaining the brake frames and support means together, against the force of the spring means, in a non-braking position; and means for mechanically connecting the two support means together through the brake frames so that both of the brakes be operated by movement of only one of the support means if one of the moving means has failed.
Claim 3
Dependent Claim
43 words
A brake as claimed in claim 1, wherein the connecting means comprises a connecting rod extending between the brake frames adjacent the other ends of the support frames, and means for resiliently connecting the rod to at least one of the brake frames.
Claim 4
Dependent Claim
31 words
A brake as claimed in claim 2, including means for automatically adjusting the connecting rod at one brake frame connection to move the brake frames closer together as the brake wears.
Claim 5
Dependent Claim
22 words
A brake as claimed in claim 1, wherein the retaining means comprise solenoid means mounted on the brake frame and support means.
Claim 6
Dependent Claim
36 words
A brake as claimed in claim 1, including means for automatically adjusting each brake support means closer to the rotatable member as the brake wears, said automatic adjusting means forming part of the loose attaching means.
Claim 7
Dependent Claim
16 words
A brake as claimed in claim 1, including separate moving means for each brake support means.
Claim 8
Dependent Claim
33 words
A brake as claimed in claim 6, including means for operatively connecting the two support means together so that one moving means moves both support means together if the other moving means fails.
Claim 9
Dependent Claim
117 words
An improved brake for a member to be braked comprising a first main brake, a second emergency brake, first means for actuating the first brake to apply a braking force to the member, second means for actuating the second brake to apply a braking force to the member in an emergency situation, and means for delaying operation of the second means relative to the first means to apply the first and second braking forces in sequence in the emergency, said delaying means being an undervoltage relay in the output from a generator, said second actuating means comprising a flywheel rotated by a motor, and a generator operated by the flywheel for a limited time when power fails.
Claim 10
Dependent Claim
117 words
An improved brake for a member to be braked comprising a first main brake, a second emergency brake, first means for actuating the first brake to apply a braking force to the member, second means for actuating the second brake to apply a braking force to the member in an emergency situation, and means for delaying operation of the second means relative to the first means to apply the first and second braking forces in sequence in the emergency, said delaying means being an undervoltage relay in the output from a generator, said second actuating means comprising a flywheel rotated by a motor, and a generator operated by the flywheel for a limited time when power fails.
Claim 11
Dependent Claim
32 words
A brake as claimed in claim 8, including a motor operating the member to be braked and means actuated by the second actuating means, for opening the circuit shutting off the motor.
Claim 12
Dependent Claim
28 words
A brake as claimed in claim 9, wherein said second actuating means is a solenoid provided with safety means for shutting off the motor if the solenoid fails.
Claim 13
Dependent Claim
30 words
A brake as claimed in claim 8, including limit switch means in the second means for actuating the second brake if a limit of movement by the member is approached.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |