In a particular implementation, an electric power device includes a body, a receptacle configured to receive a plug, and a source connector configured to be coupled to a power source. The electric power device further includes a casing coupled to the body and movable with respect to the body between a first position in which the casing defines an enclosed chamber and access to the receptacle is inhibited and a second position in which the casing is configurable to enable access to the receptacle for receipt of the plug. A transition from the first position to the second position is configured to cause the receptacle to be electrically decoupled from the source connector when the casing is at the second position, and a transition from the second position to the first position is configured to cause the receptacle to be electrically coupled to the source connector when the casing is at the first position.

A vehicle unit for charging a battery of an electric vehicle including a receptacle, which is designed and configured to receive a contact head, inserted in an insertion direction of a floor unit, and contact elements for establishing an electrical connection with contacts of the contact head, wherein the contact elements can be moved in a plane perpendicular to the insertion direction for the purpose of establishing the electrical connection with the contact head.

A vehicle unit for charging a battery of an electric vehicle including a receptacle, which is designed and configured to receive a contact head, inserted in an insertion direction of a floor unit, and contact elements for establishing an electrical connection with contacts of the contact head, wherein the contact elements can be moved in a plane perpendicular to the insertion direction for the purpose of establishing the electrical connection with the contact head.

A plug-in connection assembly of a light-emitting diode (LED) display device, an LED box assembly and the LED display device are provided. The plug-in connection assembly of an LED display device includes a first plug-in connection member; a second plug-in connection member spaced apart from the first plug-in connection member; and an intermediate structure arranged between the first plug-in connection member and the second plug-in connection member, wherein the intermediate structure includes a third plug-in connection member and a fourth plug-in connection member that are spaced apart from each other, and a driving member for driving the third plug-in connection member and the fourth plug-in connection member to move. When the driving member is in an initial position, the third plug-in connection member and the fourth plug-in connection member are close to each other, the third plug-in connection member is separated from the first plug-in connection member, and the fourth plug-in connection member is separated from the second plug-in connection member. When the driving member is in a pushing position, the third plug-in connection member and the fourth plug-in connection member are away from each other, the third plug-in connection member is connected with the first plug-in connection member in a plug-in manner, and the fourth plug-in connection member is connected with the second plug-in connection member in a plug-in manner. The technical solution of the disclosure effectively solves the problem of insecurity caused because wires are distributed at backs of LED boxes.

A plug-in connection assembly of a light-emitting diode (LED) display device, an LED box assembly and the LED display device are provided. The plug-in connection assembly of an LED display device includes a first plug-in connection member; a second plug-in connection member spaced apart from the first plug-in connection member; and an intermediate structure arranged between the first plug-in connection member and the second plug-in connection member, wherein the intermediate structure includes a third plug-in connection member and a fourth plug-in connection member that are spaced apart from each other, and a driving member for driving the third plug-in connection member and the fourth plug-in connection member to move. When the driving member is in an initial position, the third plug-in connection member and the fourth plug-in connection member are close to each other, the third plug-in connection member is separated from the first plug-in connection member, and the fourth plug-in connection member is separated from the second plug-in connection member. When the driving member is in a pushing position, the third plug-in connection member and the fourth plug-in connection member are away from each other, the third plug-in connection member is connected with the first plug-in connection member in a plug-in manner, and the fourth plug-in connection member is connected with the second plug-in connection member in a plug-in manner. The technical solution of the disclosure effectively solves the problem of insecurity caused because wires are distributed at backs of LED boxes.

Improvements are disclosed to known twist-lock electrical connectors, whose plug blades form parallel segments of a common cylindrical form. After insertion in a compatible receptacle, rotating the connectors relative to each other engages features intended to prevent accidental separation, but which do not positively lock. An improved plug is disclosed providing positive locking and with prior art receptacles.

Improvements are disclosed to known twist-lock electrical connectors, whose plug blades form parallel segments of a common cylindrical form. After insertion in a compatible receptacle, rotating the connectors relative to each other engages features intended to prevent accidental separation, but which do not positively lock. An improved plug is disclosed providing positive locking and with prior art receptacles.

An arc prevention system including a jack having a receptacle, with the receptacle having an upper wall, a bottom wall, two opposing side walls and a back wall between the two opposing side walls, a sensor unit positioned on the back wall of the receptacle, where the sensor unit is positioned on the back wall of the receptacle such that the sensor unit engages a plug inserted into the receptacle.

An arc prevention system including a jack having a receptacle, with the receptacle having an upper wall, a bottom wall, two opposing side walls and a back wall between the two opposing side walls, a sensor unit positioned on the back wall of the receptacle, where the sensor unit is positioned on the back wall of the receptacle such that the sensor unit engages a plug inserted into the receptacle.

In a connector assembly in which a first connector and a second connector are fitted to each other, a first shell, which has a rectangular frame-like shape and serves as an outer shell of the first connector, includes curved portions on upper ends of respective sides of the rectangle, and a second shell, which has a rectangular frame-like shape and serves as an outer shell of the second connector, includes convex portions, which are elongated along respective sides to be slender, on outer surfaces on the sides of the rectangle. The curved portions and the convex portions are positioned so that the curved portions and the convex portions are partially overlapped with each other. The convex portions are in contact with the first shell through the entire lengths, and the curved portions are in contact with the second shell through the entire lengths.