Automatic swing device
First Claim
Patent Images
1. A swing device comprising:
- a supporter;
a seat suspended on the supporter to swing in front and back directions;
a permanent magnet installed in the seat; and
an electromagnet installed to face the permanent magnet in a swing path to have the same polarity as that of the permanent magnet, wherein the electromagnet is selectively driven when the permanent magnet approaches, generating a repulsive force for the permanent magnet, and the electromagnet includes an iron core, a primary coil wound around the iron core, a power source for supplying electric current to the primary coil, and a switching unit disposed between the primary coil and the power source so as to selectively interrupt current supply from the power source to the primary coil.
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Accused Products
Abstract
A swing device has a supporter, a seat suspended on the supporter to swing in front and back directions, a permanent magnet installed in the seat, and an electromagnet installed to face the permanent magnet in a swing path to have the same polarity as that of the permanent magnet. The electromagnet is selectively driven when the permanent magnet approaches, generating a repulsive force for the permanent magnet. The seat swings by the repulsive force. The swing device has merits in that its simple structure makes manufacturing cost reduced and that a fixed polarity of the electromagnet prevents a malfunction of the device.
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Citations
5 Claims
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1. A swing device comprising:
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a supporter;
a seat suspended on the supporter to swing in front and back directions;
a permanent magnet installed in the seat; and
an electromagnet installed to face the permanent magnet in a swing path to have the same polarity as that of the permanent magnet, wherein the electromagnet is selectively driven when the permanent magnet approaches, generating a repulsive force for the permanent magnet, and the electromagnet includes an iron core, a primary coil wound around the iron core, a power source for supplying electric current to the primary coil, and a switching unit disposed between the primary coil and the power source so as to selectively interrupt current supply from the power source to the primary coil. - View Dependent Claims (2, 3)
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4. A swing device comprising:
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a supporter;
a seat suspended on the supporter to swing in front and back directions;
a permanent magnet installed in the seat; and
an electromagnet installed to face the permanent magnet in a swing path to have the same polarity as that of the permanent magnet, wherein the electromagnet is selectively driven when the permanent magnet approaches, generating a repulsive force for the permanent magnet, and the permanent magnet is installed in a central position under the seat, and the electromagnet is installed directly under the permanent magnet to face the same with a certain distance. - View Dependent Claims (5)
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Specification