US3939673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for preventing unbalance in washing machines during spindrying
Assignee: US Philips Corp
•
Filing: 1974-03-13
•
Granted: 1976-02-24
•
Expires: 1994-03-13
Abstract
Abstract A device for avoiding unbalance during acceleration to spindrying. A water level sensor has an additional contact through which a control voltage which is derived from a motor speed regulator is fed, and interrupts the motor supply if the drum speed decreases below a predetermined value. Spindrying cannot commence until after the tub is filled and an operating sequence at washing speed has taken place.
Inventors
- 👤 Yves Albert Daniel Thibaut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:21
CPC Classifications
D; D06; D06F; D06F33/00; D06F33/30; D06F33/48; D06F2103/00; D06F2103/24; D06F2103/44; D06F2103/46; D06F2105/00; D06F2105/46; D06F2105/48; D06F34/00; D06F34/10; D06F37/00; D06F37/30; D06F37/304; Y; Y02; Y02B; Y02B40/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
A device for preventing excessive imbalance in a clothes washing machine, comprising a drum driving motor, means for supplying voltage to the motor, regulating means sensitive to rotational speed of said motor for providing an output electrical control signal in response to said speed being below a predetermined speed, means for controlling voltage supplied by said supply means in response to an electrical control signal input, a water level switch contact for sensing a tub empty condition, an operating function controller contact for selecting a spin drying function, and means connecting said water level sensing contact and said operating function contact between the regulating means output and said voltage controlling means input such that voltage supplied to said motor will be controlled in response to said speed sensitive signal only when said spin drying function is selected and a tub empty condition is sensed.
Claim 2
Independent Claim
144 words
A device for preventing excessive imbalance in a clothes washing machine, comprising a drum driving motor, means for supplying voltage to the motor, regulating means sensitive to rotational speed of said motor for providing an output electrical control signal in response to said speed being below a predetermined speed, means for controlling voltage supplied by said supply means in response to an electrical control signal input, a water level switch contact for sensing a tub empty condition, an operating function controller contact for selecting a spin drying function, and means connecting said water level sensing contact and said operating function contact between the regulating means output and said voltage controlling means input such that voltage supplied to said motor will be controlled in response to said speed sensitive signal only when said spin drying function is selected and a tub empty condition is sensed.
Claim 3
Dependent Claim
19 words
A device as claimed in claim 1, wherein said voltage supplying means is blocked by said electrical control signal.
Claim 4
Dependent Claim
67 words
A device as claimed in claim 1, wherein said contacts are in electrical series connection, the water level switch being closed in response to a tub empty condition, said regulating means output signal is additionally responsive to comparison of motor speed with a spindrying speed, and said voltage supply is blocked by an electrical control signal input corresponding to said motor speed being below said predetermined speed.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |