Toyo Engineering Corporation

Susumu Shibata

Makoto Wada

Kazumi Shima

Yuichi Fujita

An automatic plug-in connecting unit having small weight, capable of automatically connecting and disconnecting an electric current supply line, and satisfying the conditions for a ventilated type pressurized type explosion-protected construction or a sealed type pressurized type explosion-protected construction includes an automatic plug-in connecting apparatus having a supply side connecting unit provided with an electrically connecting socket contact which is buried in one end portion thereof, and which serves also as an air vent, a reception side connecting unit provided with a pin contact forming a counterpart of the said socket, a means for connecting and disconnecting the socket contact and pin contact to and from each other, and an engagement guide, characterized by a clean gas supply means for turning the atmosphere around the socket contact and pin contact into a clean gas atmosphere when these contacts are connected or disconnected by combining the supply side connecting unit with the reception side connecting unit, a connection detecting means for ascertaining the connection of the supply side connecting unit to the reception side connecting unit, a supplied clean gas detecting means adapted to sense the presence or absence of a clean gas supplied to the interior of the supply side connecting unit, and a current supply control means for controlling the supplying of an electric current from a power source in accordance with the operations of the connection detecting means and supplied clean gas detecting means.

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Chiba, Japan

Susumu Shibata