Patent US3555317A successfully refreshed from Google Patents.
US3555317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor and clutch
Assignee: Motion Rotators Inc
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Filing: 1969-05-01
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Granted: 1971-01-12
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Expires: 1989-05-01
Abstract
Abstract An electric motor having an internal clutch including a rotor operatively positioned within a stator and mounted on a sleeve having an inner diameter slightly larger than the outer diameter of an output shaft which extends coaxially therethrough. A compression spring coaxially mounted about the sleeve causes first and second frictional clutch plates rotationally affixed relative to the rotor and sleeve to engage adjacent mating clutch plates affixed to the output shaft. The bias provided by the compression spring allows disengagement of the clutch plates when the motor is overloaded thereby preventing damage to the motor.
Inventors
- 👤 Peter D Allan
- 👤 Mortimer J Huber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:45
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/02; H02K9/04; H02K9/06; H02K7/00; H02K7/10; H02K7/108; H02K2213/00; H02K2213/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
An electric motor comprising: a. a stator; b. a motor operatively positioned within said stator; c. an output shaft rotatably and coaxially mounted relative to said stator and said rotor and adapted to have a load affixed thereto for rotation thereby; d. a first sleeve coaxially mounted over said output shaft and engaged with said rotor so as to be rotatable with said rotor, said first sleeve and said output shaft being axially movable relative to one another; e. first frictional clutch members affixed relative to said rotor and said first sleeve for rotation therewith; f. mating frictional clutch members affixed to said shaft adjacent said first frictional clutch members for rotation with said shaft; and g. spring means for biasing said first and said mating frictional clutch members into engagement for causing said output shaft to rotate with said rotor and providing clutch action therebetween.
Claim 2
Dependent Claim
146 words
An electric motor comprising: a. a stator; b. a motor operatively positioned within said stator; c. an output shaft rotatably and coaxially mounted relative to said stator and said rotor and adapted to have a load affixed thereto for rotation thereby; d. a first sleeve coaxially mounted over said output shaft and engaged with said rotor so as to be rotatable with said rotor, said first sleeve and said output shaft being axially movable relative to one another; e. first frictional clutch members affixed relative to said rotor and said first sleeve for rotation therewith; f. mating frictional clutch members affixed to said shaft adjacent said first frictional clutch members for rotation with said shaft; and g. spring means for biasing said first and said mating frictional clutch members into engagement for causing said output shaft to rotate with said rotor and providing clutch action therebetween.
Claim 3
Dependent Claim
21 words
An electric motor as set forth in claim 1 wherein the sleeve hAs a fan affixed thereto for cooling the motor.
Claim 4
Dependent Claim
42 words
An electric motor as set forth in claim 1 wherein the spring biasing means includes a compression spring with a force sufficient to produce a frictional force between the clutch members which is less than the starting torque of the electric motor.
Claim 5
Dependent Claim
69 words
An electric motor as set forth in claim 3 including a second sleeve coaxially mounted over said output shaft wherein: a. said first frictional clutch members include a clutch member attached to said second sleeve for frictional engagement with one of said mating clutch members; and b. said first and second sleeves include axially overlapping portions which mate to allow relative axial movement and to prevent relative rotational movement.
Claim 6
Dependent Claim
129 words
An electric motor as set forth in claim 4 wherein: a. said first frictional clutch members include first and second clutch plates, said first clutch plate being affixed to said second sleeve and directed axially outward in one direction therefrom and said second clutch plate being affixed relative to said rotor and directed axially outward in the opposite direction therefrom; b. said mating frictional clutch members include first and second mating clutch plates affixed relative to said shaft coaxial with and adjacent said first and second clutch plates, respectively, for frictional engagement therewith; c. said compression spring is mounted coaxially over said first and second sleeves; and d. said overlapping portions of said first and second sleeves include mating first and second semicylindrical slots in adjacent ends thereof, respectively.
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |