US4324995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thrust preventive device for the output shaft of an electric motor
Assignee: Olympus Corp
•
Filing: 1980-03-04
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Granted: 1982-04-13
•
Expires: 2000-03-04
Abstract
Abstract A thrust preventive device for the output shaft of an electric motor comprises an electric motor having one end face from which an output shaft is projected and a rotating force transmitting member secured outside the motor to a portion of the output shaft which is projected from the one end face of the motor. The one end face of the motor has a recess therein. The rotating force transmitting member comprises a fly-wheel and a pulley. The fly-wheel has one end face which opposes the one end face of the motor and another face which is connected to the pulley. A projection which is formed of iron is provided on the one end face of the fly-wheel and projects toward the one end face of the motor and into the recess. The projection is attracted in one direction taken along a central axis of the output shaft by the magnetic force from the permanent magnets which are located in the motor housing to rotate the output shaft. Therefore, the output shaft is biased in said one direction and is kept at a position thus biased.
Inventors
- 👤 Noboru Sakai
- 👤 Tokuo Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:06
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/56; H02K7/00; H02K7/08; H02K7/085
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
227 words
A thrust preventive device for the output shaft of an electric motor, comprising: an electric motor having an end face on one end thereof from which an elongated rotatable output shaft of the motor is projecting; a recess provided on said end face of the motor; a rotating force transmitting member secured to a portion of the output shaft which is projected from said end face of the motor, said rotating force transmitting member being outside the motor and having one end face opposing said end face of the motor, said rotating force transmitting member including a fly-wheel portion and a rotating force transmitting portion directly coupled to the fly-wheel portion for transmitting the rotating force of the output shaft, said one end face of said rotating force transmitting member being on said fly-wheel portion; a projection of magnetizable material provided on said one end face of said rotating force transmitting member and projecting into said recess so as to bias said rotating force transmitting member when magnetized, jointly with the output shaft, by magnetic lines of force produced by the electric motor in one direction along the axis of said output shaft; and a position maintaining means located inside an other end of said motor for preventing said output shaft from biasing said rotating force transmitting member, thus keeping said output shaft at a predetermined position.
Claim 2
Dependent Claim
227 words
A thrust preventive device for the output shaft of an electric motor, comprising: an electric motor having an end face on one end thereof from which an elongated rotatable output shaft of the motor is projecting; a recess provided on said end face of the motor; a rotating force transmitting member secured to a portion of the output shaft which is projected from said end face of the motor, said rotating force transmitting member being outside the motor and having one end face opposing said end face of the motor, said rotating force transmitting member including a fly-wheel portion and a rotating force transmitting portion directly coupled to the fly-wheel portion for transmitting the rotating force of the output shaft, said one end face of said rotating force transmitting member being on said fly-wheel portion; a projection of magnetizable material provided on said one end face of said rotating force transmitting member and projecting into said recess so as to bias said rotating force transmitting member when magnetized, jointly with the output shaft, by magnetic lines of force produced by the electric motor in one direction along the axis of said output shaft; and a position maintaining means located inside an other end of said motor for preventing said output shaft from biasing said rotating force transmitting member, thus keeping said output shaft at a predetermined position.
Claim 3
Dependent Claim
22 words
The thrust preventive device of claim 1, wherein said projection and said recess are both annular and concentric with said output shaft.
Claim 4
Dependent Claim
28 words
The thrust preventive device of claim 1, wherein said rotating force transmitting member is formed integrally with said projection and made of the same material as said projection.
Claim 5
Dependent Claim
37 words
The thrust preventive device of any one of claims 1, 2 or 3, comprising a magnetic force generating section within the motor and which includes at least one permanent magnet for causing said output shaft to rotate.
Claim 6
Dependent Claim
19 words
The thrust preventive device of claim 1 or 2, wherein said rotating force transmitting member is made of brass.
Claim 7
Dependent Claim
31 words
The thrust preventive device of claim 5, comprising a magnetic force generating section within the motor and which includes at least one permanent magnet for causing said output shaft to rotate.
Claim 8
Dependent Claim
37 words
The thrust preventive device of any one of claims 1, 2 or 3, wherein said rotating force transmitting portion of said rotating transmitting member is formed integrally with said fly-wheel portion of said rotating force transmitting member.
Claim 9
Dependent Claim
42 words
The thrust preventive device of claim 1 or 2, wherein said one end face of said rotating force transmitting member has a recess therein, said projection being fixedly mounted in said recess of said rotating force transmitting member while also projecting therefrom.
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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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |