Patent US3608679A successfully refreshed from Google Patents.
US3608679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically operated braking device
Assignee: WESTATE ELECTRICAL IND Ltd
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Filing: 1969-07-07
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Granted: 1971-09-28
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Expires: 1989-07-07
Abstract
Abstract A braking device for a machine having a rotating shaft wherein a brake disc is attached to the shaft for rotation therewith, the brake disc facing a brake plate which plate is held away from the brake disc by an electromagnet, manually operable locking means being provided to lock the brake plate in a released position when the electromagnet is deenergized, the locking means being automatically disengaged when the electromagnet is energized.
Inventors
- 👤 Stanley George Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:28
CPC Classifications
F; F16; F16D; F16D55/00; F16D55/02; F16D59/00; F16D59/02; F16D2121/00; F16D2121/18; F16D2121/20; F16D2121/22; F16D2127/00; F16D2127/02; F16D2127/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
246 words
A braking device for attachment to a machine having a rotating shaft, said device comprising a brake disc adapted to be attached to said shaft for rotation therewith, a brake plate facing the brake disc and movable towards and away from the brake disc, an electromagnet located on the side of the brake plate remote from the brake disc such that energization of the electromagnet causes the brake plate to move away from the brake disc, spring means biasing said brake plate so as to engage it with said brake disc to retard or stop rotation of said shaft when said electromagnet is deenergized, manually operable means for locking the brake plate in a released position when the electromagnet is deenergized, said means for locking being arranged so as to be automatically disengaged when the electromagnet is energized, said electromagnet being of annular form, and an adjusting nut located within the opening in the annular electromagnet, the end face of the nut adjacent the brake plate being provided with said spring means, said spring means comprising a plurality of compression springs located one to each of a similar plurality of recesses in said end face, said compression springs being each arranged to bear against a spring box such that when the electromagnet is deenergized the compression springs cause said spring boxes to bear against said brake plate to cause the brake plate to engage the brake disc to retard and/or stop rotation of the rotating shaft.
Claim 2
Dependent Claim
246 words
A braking device for attachment to a machine having a rotating shaft, said device comprising a brake disc adapted to be attached to said shaft for rotation therewith, a brake plate facing the brake disc and movable towards and away from the brake disc, an electromagnet located on the side of the brake plate remote from the brake disc such that energization of the electromagnet causes the brake plate to move away from the brake disc, spring means biasing said brake plate so as to engage it with said brake disc to retard or stop rotation of said shaft when said electromagnet is deenergized, manually operable means for locking the brake plate in a released position when the electromagnet is deenergized, said means for locking being arranged so as to be automatically disengaged when the electromagnet is energized, said electromagnet being of annular form, and an adjusting nut located within the opening in the annular electromagnet, the end face of the nut adjacent the brake plate being provided with said spring means, said spring means comprising a plurality of compression springs located one to each of a similar plurality of recesses in said end face, said compression springs being each arranged to bear against a spring box such that when the electromagnet is deenergized the compression springs cause said spring boxes to bear against said brake plate to cause the brake plate to engage the brake disc to retard and/or stop rotation of the rotating shaft.
Claim 3
Dependent Claim
47 words
A braking device as claimed in claim 1 wherein the coil of the electromagnet is located in an annular groove opening into the face of the electromagnet facing the brake plate, said opening being closed by a nonmagnetic ring to provide a flameproof enclosure for the coil.
Claim 4
Dependent Claim
107 words
A braking device as claimed in claim 1 wherein said manually operable means comprises a lever arm pivotally mounted on the periphery of the electromagnet, said lever arm being provided with a cam surface which is adapted to engage an outwardly projecting lug on the periphery of said armature, a link pivotally connected at one end to the periphery of the brake plate, the other end of said link being pivotally connected to the lever arm adjacent the pivotal connection to the armature such that when the armature is attracted towards the electromagnet, the lug moves over the cam surface to automatically disengage said means for locking.
Claim 5
Dependent Claim
91 words
A braking device as claimed in claim 1 wherein means are provided for preSetting or reproducing a predetermined torque, said means comprising a plurality of indicia spaced on the end face of said adjusting nut, the height of the indicia above the end face being determined by the pitch of the thread of the adjusting nut, the electromagnet having a suitable indicator line machined thereon around the periphery of the nut such that each turn of the nut is clearly indicated by one of the indicia coinciding with the indicator line.
Claim 6
Dependent Claim
247 words
An electrically operated brake motor comprising a motor shaft free to rotate with the rotor of the motor within the motor housing, a brake disc mounted adjacent one end of the motor shaft for rotation therewith, a brake plate facing the brake disc and movable towards and away from the brake disc, an electromagnet located on the side of the brake plate remote from the brake disc such that energization of the electromagnet causes the brake plate to move away from the brake disc, an annular armature located between the electromagnet and said brake plate, the brake plate and the armature being separated by a wave washer-type spring but maintained to move as a single unit when the armature is attracted by the electromagnet by means of a circlip mounted on a portion of said brake plate which passes through the opening in the annular armature, spring means biasing said brake plate so as to engage it with said brake disc to retard or stop rotation of said motor shaft when said electromagnet is deenergized, and manually operable means for locking the brake plate in a released position when the electromagnet is deenergized, said means for locking being arranged so as to be automatically disengaged when the electromagnet is energized, said electromagnet including a coil located in an annular groove opening into the face of the electromagnet facing the brake plate, said opening being closed by a nonmagnetic ring to provide a flameproof enclosure for the coil.
Claim 7
Dependent Claim
247 words
An electrically operated brake motor comprising a motor shaft free to rotate with the rotor of the motor within the motor housing, a brake disc mounted adjacent one end of the motor shaft for rotation therewith, a brake plate facing the brake disc and movable towards and away from the brake disc, an electromagnet located on the side of the brake plate remote from the brake disc such that energization of the electromagnet causes the brake plate to move away from the brake disc, an annular armature located between the electromagnet and said brake plate, the brake plate and the armature being separated by a wave washer-type spring but maintained to move as a single unit when the armature is attracted by the electromagnet by means of a circlip mounted on a portion of said brake plate which passes through the opening in the annular armature, spring means biasing said brake plate so as to engage it with said brake disc to retard or stop rotation of said motor shaft when said electromagnet is deenergized, and manually operable means for locking the brake plate in a released position when the electromagnet is deenergized, said means for locking being arranged so as to be automatically disengaged when the electromagnet is energized, said electromagnet including a coil located in an annular groove opening into the face of the electromagnet facing the brake plate, said opening being closed by a nonmagnetic ring to provide a flameproof enclosure for the coil.
Claim 8
Dependent Claim
111 words
A brake motor as claimed in claim 5, there being an adjusting nut located within the opening in the annular electromagnet, the end face of the nut adjacent the brake plate being provided with said spring means, said spring means comprising a plurality of compression springs located one to each of a similar plurality of recesses in said end face, said compression springs each being arranged to bear against a spring box such that when the electromagnet is deenergized the compression springs cause said spring boxes to bear against said brake plate to cause the brake plate to engage the brake disc to retard and/or stop rotation of the motor shaft.
Claim 9
Dependent Claim
104 words
A brake motor as claimed in claim 5 wherein said manually operable means comprises a lever arm pivotally mounted on the periphery of the electromagnet said lever arm being provided with a cam surface which is adapted to engage an outwardly projecting lug on the periphery of said armature, a link pivotally connected at one end to the periphery of the brake plate, the other end being pivotally connected to the lever arm adjacent the pivotal connection to the armature such that when the armature is attracted towards the electromagnet, the lug moves over the cam surface to automatically disengage said means for locking.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |