US4969229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery-operated surface treatment apparatus having a booster function
Assignee: Electrolux AB
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Filing: 1989-06-05
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Granted: 1990-11-13
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Expires: 2009-06-05
Abstract
Abstract A battery-operated surface treatment apparatus having a booster function, preferably a vacuum cleaner, comprises an electric motor (10) which drives a treatment unit, such as a suction fan. Further, the apparatus comprises a battery-powered power supply unit (11) for the motor and, in addition, the apparatus is provided with a coupling device (18,23) for the activation of the booster function by temporarily connecting a separate battery (14) in series with the batteries in the power supply unit (11).
Inventors
- 👤 Joakim A. Svanberg
- 👤 Lars G. Kilstrom
- 👤 Lars G. Tuvin
- 👤 Anders E. C. Larsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:53
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/08; H02P7/14; A; A47; A47L; A47L9/00; A47L9/28; A47L9/2836; A47L9/2842; A47L9/2857; A47L9/2868; A47L9/2884; A47L9/2889
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
A battery-operated surface treatment apparatus having a booster function, preferably a vacuum cleaner, comprising a treatment unit driven by an electric motor (10), and a battery-powered supply unit (11) for the motor, characterized by a coupling device (18, 23) arranged to activate the booster function by temporarily connecting a separate battery (14) in series with the batteries for the power supply unit (11), a protecting device (23) being provided to connect the separate battery (14) only if the terminal voltage (U) of said battery exceeds a predetermined value.
Claim 2
Dependent Claim
88 words
A battery-operated surface treatment apparatus having a booster function, preferably a vacuum cleaner, comprising a treatment unit driven by an electric motor (10), and a battery-powered supply unit (11) for the motor, characterized by a coupling device (18, 23) arranged to activate the booster function by temporarily connecting a separate battery (14) in series with the batteries for the power supply unit (11), a protecting device (23) being provided to connect the separate battery (14) only if the terminal voltage (U) of said battery exceeds a predetermined value.
Claim 3
Dependent Claim
53 words
A surface treatment apparatus according to claim 1, characterized in that the coupling device comprises a relay (23) provided with a holding circuit, said relay being designed so as to be activated for the connection of the holding circuit only if the terminal voltage of the separate battery (14) exceeds the predetermined value.
Claim 4
Dependent Claim
49 words
A surface treatment apparatus according to claim 2, characterized in that the coupling device (18,23) co-operates with a time control device (28) which determines the connecting time of the booster function, the time control device (28) having a switching means (29) connected in series with the relay winding (23a).
Claim 5
Dependent Claim
128 words
A surface treatment apparatus according to claim 3, characterized in that the power supply unit (11) has a positive terminal (12) and a negative terminal (13), the negative terminal (30) being directly connected to one terminal (31) of the motor (10) and the positive terminal (12) being connected to the other terminal (30) of the motor via the separate battery (14), a starting contact (18) for the booster function and the switching means (29) of the time control device, said other terminal (30) via a shiftable relay contact (24) being connected to the positive terminal (12) of the power supply unit or, alternatively, with activated relay, to the positive terminal of the separate battery (14) which via said starting contact (18) is connected to the relay winding (23a).
Claim 6
Dependent Claim
31 words
A surface treatment apparatus according to any of the preceding claims, characterized in that the batteries of the power supply unit (11) and the separate battery (14), respectively, are rechargeable batteries.
Claim 7
Dependent Claim
20 words
A surface treatment apparatus according to claim 5, characterized in that the separate battery (14) is of the nickel-cadmium type.
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) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |