US3600633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for office machines actuated by an electric motor consisting of a temperature responsive deformable thermoplastic gear
Assignee: Olivetti SpA
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Filing: 1970-06-16
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Granted: 1971-08-17
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Expires: 1990-06-16
Abstract
Abstract A safety device for electric office machines comprises a reduction gear train adapted to transmit the rotation of the motor shaft to a main shaft of the machine, the gear train comprising a gear of thermoplastic material. When the motor is stalled and the rotor temperature rises, the temperature of the gear rises sufficiently rapidly to become plastic, thus allowing the motor to turn freely before real damage occurs thereto.
Inventors
- 👤 Carlo Bellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:51
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/10; H02K7/116; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19614
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
127 words
Safety device for machines actuated by an electric motor, comprising an electric motor, a reduction gear train adapted to transmit the rotation of the motor shaft to a main shaft of the machine the gear train comprising a first gear of thermoplastic material in mesh with a second gear, means being provided for rendering the temperature of the second gear a direct function of the temperature of the rotor of the motor, such that, when the motor is stalled and the rotor temperature rises, the temperature of the second gear rises sufficiently rapidly to cause the teeth of the first gear to become plastic in consequence of jamming of the main shaft of the machine and allow the motor to turn freely before real damage occurs thereto.
Claim 2
Dependent Claim
127 words
Safety device for machines actuated by an electric motor, comprising an electric motor, a reduction gear train adapted to transmit the rotation of the motor shaft to a main shaft of the machine the gear train comprising a first gear of thermoplastic material in mesh with a second gear, means being provided for rendering the temperature of the second gear a direct function of the temperature of the rotor of the motor, such that, when the motor is stalled and the rotor temperature rises, the temperature of the second gear rises sufficiently rapidly to cause the teeth of the first gear to become plastic in consequence of jamming of the main shaft of the machine and allow the motor to turn freely before real damage occurs thereto.
Claim 3
Dependent Claim
25 words
A device according to claim 1, wherein the motor shaft is a metal shaft which is fast with the rotor and with the second gear.
References Cited (Backward Citations)
US2314227A
Cited
US3441820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |