US5813712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic load lifting device
Assignee: Mozelt GmbH and Co KG
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Filing: 1996-09-05
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Granted: 1998-09-29
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Expires: 2016-09-05
Abstract
Abstract A magnetic lifting device having a load lifting magnet with at least one magnetic coil arranged in a housing. A driven synchronous alternator is arranged in a housing for generating a voltage supplied to the magnetic coil. A supply line leading from the alternator to the magnetic coil supplies direct current to the magnetic coil. An electrical switching circuit with a control line arranged within the alternator housing connects to a control switch outside the alternator housing through a further control line outside the alternator housing. The control switch actuates a first rectifier connected to the alternator for powering the coil of the magnet. It also deactivates the magnet by powering a second rectifier of a reverse polarity to release the magnet load. The control switch also includes an overload signal and alarm, and a ready light when the magnet is ready to be powered.
Inventors
- 👤 Winfried Mozelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:54
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/04; B66C1/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
118 words
A magnetic lifting device comprising (a) a load lifting magnet having at least one magnetic coil arranged in a housing, (b) a driven synchronous alternator arranged in a housing for generating a current supplied to the magnetic coil, (1) the alternator comprising a first and second three-phase winding, (c) a supply line coupling the alternator to the magnetic coil for supplying direct current to the magnetic coil, (d) an electrical switching circuit with a control line arranged within the alternator housing, (e) a control switch disposed outside the alternator housing, and (f) a further control line disposed outside the alternator housing, said further control line connecting said control switch to said control line of the electrical switching circuit.
Claim 2
Dependent Claim
118 words
A magnetic lifting device comprising (a) a load lifting magnet having at least one magnetic coil arranged in a housing, (b) a driven synchronous alternator arranged in a housing for generating a current supplied to the magnetic coil, (1) the alternator comprising a first and second three-phase winding, (c) a supply line coupling the alternator to the magnetic coil for supplying direct current to the magnetic coil, (d) an electrical switching circuit with a control line arranged within the alternator housing, (e) a control switch disposed outside the alternator housing, and (f) a further control line disposed outside the alternator housing, said further control line connecting said control switch to said control line of the electrical switching circuit.
Claim 3
Dependent Claim
25 words
The magnetic lifting device of claim 1, wherein the electrical switching circuit with its control line operates contactless and is driven in a stand-by mode.
Claim 4
Dependent Claim
24 words
The magnetic lifting device of claim 1 additionally comprising a motor of a type differing from that of the alternator for driving the alternator.
Claim 5
Dependent Claim
15 words
The magnetic lifting device of claim 3, wherein the motor is an internal combustion engine.
Claim 6
Dependent Claim
14 words
The magnetic lifting device of claim 3, wherein the motor is a hydraulic motor.
Claim 7
Dependent Claim
14 words
The magnetic lifting device of claim 3, wherein the motor is an electric motor.
Claim 8
Dependent Claim
19 words
The magnetic lifting device of claim 1, wherein the supply line supplies 230 d.c. volt to the magnetic coil.
Claim 9
Dependent Claim
27 words
The magnetic lifting device of claim 1, wherein said further control line disposed outside the alternator housing is operated with a voltage of 12 or 24 V.
Claim 10
Dependent Claim
37 words
The magnetic lifting device of claim 1, wherein said alternator includes first and second three-phase rectifiers respectively coupled to the input of said first and second three-phase windings, and having an output coupled to the magnetic coil.
Claim 11
Dependent Claim
24 words
The magnetic lifting device of claim 9, wherein each of said rectifiers includes a control gate and is coupled to the electrical switching circuit.
Claim 12
Dependent Claim
40 words
The magnetic lifting device of claim 10, wherein each of said rectifiers produces a voltage of opposite polarity, and said switching circuit operates one or the other rectifier to turn on or off the voltage supplied to the magnetic coil.
Claim 13
Dependent Claim
36 words
The magnetic lifting device of claim 11 comprising a power supply cable for coupling the magnetic coil to said alternator, said cable including clamping bolts for quickly connecting and disconnecting said cable to the alternator housing.
Claim 14
Dependent Claim
34 words
The magnetic lifting device of claim 12, wherein said control switch includes a ready indicator, means for turrning on and off the power to the magnetic coil, and audible alarm and overload indicator lamp.
References Cited (Backward Citations)
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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) | 2001-09-28 | 2002-03-30 | 2002-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-28 | 2006-03-30 | 2006-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-28 | 2010-03-30 | 2010-09-29 | $7700.00 | Window Closed / Lapsed |