Power source circuit shut off device

1. A power source circuit shut off device comprising:

a plug having a terminal metal fitting and a housing to which the terminal metal fitting is attached; and

a plug attachment section having a second terminal metal fitting to be connected to the terminal metal fitting and a second housing to which the second terminal metal fitting is attached,

wherein a first opening section for inserting the second terminal metal fitting is provided at a bottom face of the housing at a second housing side;

wherein the housing has a second opening section for attaching the terminal metal fitting to the housing, the second opening section being provided on a side face of the housing perpendicular to the bottom face;

wherein the housing is brought into close to the second housing, and a tip portion of the second terminal metal fitting is advanced into the innermost side of the terminal metal fitting from a terminal contact position at which the tip portion of the second terminal metal fitting is first brought into contact with the terminal metal fitting before the housing is accommodated in the second housing, and thereby the housing is positioned at a complete fitting position at which the housing is accommodated in the second housing and the second opening section is closed by the second housing; and

wherein a closing wall is provided so as to protrude from an edge of an insertion hole through which the housing is inserted into the second housing, and closes the second opening section in a state that the housing is positioned at the terminal contact position.

2. The power source circuit shut off device according to claim 1 , wherein a lever is rotatably attached to the housing;

wherein a pair of projection sections is provided on the housing and protrudes in the directions of mutually separating from each other for attaching the lever to the housing;

wherein a pair of abutment shafts is provided on the plug attachment section and protrudes in the directions of mutually separating from overlapping walls overlapped with outer walls respectively having the projection sections;

wherein the abutment shafts are provided at positions which are brought into contact with outer edges of the lever when the lever is rotated from the terminal contact position;

wherein the lever is provided so as to be rotated in a state that the abutment shafts are in contact with the outer edges; and

wherein the abutment shafts are positioned at the sides in the directions of separating away more than the projection sections in a state that the housing is positioned at the complete fitting position.

3. The power source circuit shut off device according to claim 1 , wherein the lever is provided so as to be slidable with respect to the housing and the second housing accommodating the housing in a state that the housing is positioned at the complete fitting position, and a pair of pin reception terminals are disposed so as to have an interval therebetween on a power source line from a battery to a load and are attached to the second housing;

wherein a pin terminal is attached to the lever and connects the pair of pin reception terminals with each other; and

wherein when the lever is slid in a state that the housing is positioned at the complete fitting position, the pin terminal connects the pair of pin reception terminals with each other so as to establish the conduction between the pair of pin reception terminals, thereby forming a closed circuit.