Automatic swing device

Details Automatic swing device Automatic swing device

2005-06-21

2005-06-21

Nguyen, Kien (Department: 3714)

Amusement devices

Swing

Motor operated

C005S105000

Reexamination Certificate

active

06908398

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.

REFERENCES:
patent: 1727635 (1929-09-01), Crane
patent: 3261032 (1966-07-01), Reardon
patent: 3842450 (1974-10-01), Pad
patent: 3849812 (1974-11-01), Walsh
patent: 4730176 (1988-03-01), Matsuo et al.
patent: 5048135 (1991-09-01), Chen
patent: 5174035 (1992-12-01), Yamazaki
patent: 5307531 (1994-05-01), Kao
patent: 5608366 (1997-03-01), Sako
patent: 6692368 (2004-02-01), Hyun

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