US 4,926,286 AGranted

Enclosed switchboard

AssigneeTogami Electric Mfg. Co., Ltd.

InventorsKazuyoshi Maki, Sadami Harada, Takanori Nakashima

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Abstract

An enclosed switchboard has a contact frame fitted with contacts which can move relative to a unit frame having a circuit breaker, an electromagnetic switch, and an auxiliary relay, etc. mounted thereon. The contacts can be operated to disconnected, test, and connected positions with the unit frame disposed in the panel frame by an operating lever inserted into a window on a closed door covering the front side of the panel frame. A shutter mechanism is provided between the window and the insertion position of the operating lever in order to cover the insertion position of the operating lever for preventing insertion of the operating lever when the operating handle is set to an ON position, and an interlocking mechanism is also provided between the shutter mechanism and the operating handle of a circuit breaker disposed at the unit frame.

Claims15

Dependent claims

An enclosed switchboard comprising a panel frame means, fixed contacts on said panel frame means, moveable contact frame means moveably mounted on said panel frame means, said moveable contact frame having moveable contacts, said moveable contact frame means being moveable between at least one operable position wherein at least one of said moveable contacts is in contact with at least one of said fixed contacts and a second operable position wherein said at least one moveable contact is out of contact with said at least one fixed contact, operable means operably connected between said moveable contact frame means and said panel frame means for moving said moveable contact frame means between said first and second operable positions, said operable means having handle-receiving means for receiving a handle which is operable to move said moveable contact frame means between said first and second operable positions, said panel frame means having a handle access opening through which said handle extends when said handle is disposed in said handle-receiving means, a shutter means mounted on said panel frame means for movement between a blocking position and a non-blocking position, said shutter means in said non-blocking position being clear of said handle access opening to thereby permit said handle to be inserted into said handle-receiving means and to move said moveable contact frame means between said first and second operable positions, said shutter means in said blocking position blocking at least a portion of said handle access opening to prevent said handle from being inserted into said handle-receiving means and thereby precluding movement of said moveable contact frame means between said first and second operable positions, and actuating means for actuating said shutter means between said blocking and non-blocking positions.

Dependencies are inferred from the claim text.