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US 2008/0290669 A1Published application
Device For Controlling a Door
AssigneeShanghai One Top Corporation
InventorTsung-Chih Chang
Life of this patent
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Abstract
A device for controlling a door, the device having: a body; an electromagnet arranged to generate a magnetic field for retaining the door; a coupling that couples the electromagnet to the body, the coupling being arranged to allow a movement of the electromagnet relative to the body; and a current supply that is arranged to supply the electromagnet with a current. The current supply is arranged to detect the movement of the electromagnetic and to cease supplying the current at a predetermined instant after detecting the movement of the electromagnet.
Claims12
A device for controlling a door, the device comprising;
- a body;
- an electromagnet arranged to generate a magnetic field for retaining the door;
- a coupling means that couples the electromagnet relative to the body;
- and
- a current supply means that is arranged to supply the electromagnet with a current supply means being further arranged to detect the movement of the electromagnetic and to cease supplying the current at the predetermined instant after detecting the movement of the electromagnet.
2 more elements
(canceled)
Dependencies are inferred from the claim text.