Lever fitting-type connector

1. A lever fitting-type connector comprising:

a first housing configured to accommodate a first terminal;

a lever that has a pair of arm sections which sandwiches the first housing therebetween and that is rotatably attached to the first housing, and each of the arm sections having a cam groove; and

a second housing configured to accommodate a second terminal, and that has a peripheral wall configured to receive the first housing thereinto and a pair of cam pins provided on outer faces of both sides of the peripheral wall and protruding outwardly to be engaged with the cam grooves respectively,

wherein each of the cam grooves includes:

an inlet section which is formed so that the cam pin can enter;

a curved section which is formed so that a distance between the curved section and a rotation center axis of the lever is smaller as the curved section is away from a portion communicating with the inlet section to an innermost section of the cam groove; and

a guide rail section provided on an inner peripheral face of the cam groove and formed so that the cam pin can be engaged therewith; and

wherein the inlet section has a running-on preventing portion which is formed separate from the guide rail section so that the guide rail section terminates ahead of the running-on preventing portion and the cam pin thereby enters the inlet section without allowing the guide rail section to run on the cam pin.

2. The lever fitting-type connector according to claim 1 , wherein the inner peripheral face of each of the cam grooves includes:

an outer edge-side inner peripheral face formed on an outer edge section of the arm section; and

a rotation center axis-side inner peripheral face formed closer to the rotation center axis of the lever than the outer edge-side inner peripheral face;

wherein the running-on preventing portion has a running-on preventing space that is formed by a cut-out portion of the guide rail section on the rotation center axis-side inner peripheral face of the inlet section; and

wherein the guide rail section is formed on the outer edge-side inner peripheral face of the inlet section and is engageable with the cam pin when the cam pin enters the inlet section.

3. The lever fitting-type connector according to claim 1 , wherein a guide wall is provided so as to protrude along a peripheral edge of the cam groove.

4. The lever fitting-type connector according to claim 1 , wherein the cam pin entered into the inlet section is movable to the running-on preventing space.

5. The lever fitting-type connector according to claim 1 , wherein the first terminal accommodated in the first housing and the second terminal accommodated in the second housing are portions of a service plug for performing switching between an energized state and a shutoff state of a power circuit; and

wherein the power circuit is switched to the energized state when the first terminal is connected to the second terminal and is switched to the shutoff state when the connection of the first terminal and the second terminal is released.

6. The lever fitting-type connector according to claim 1 , wherein the cam pin and the guide rail section are stepped so as to fit together when engaged.

7. The lever fitting-type connector according to claim 1 , wherein the guide rail section is provided with a protruding rail part extending thereon, and the cam pin includes a peripheral guide slot configured for engagement with the protruding rail part of the guide rail section.

8. The lever fitting-type connector according to claim 7 , wherein the protruding rail part of the guide rail section terminates ahead of the running-on preventing portion so that the cam pin enters the inlet section at the running-on preventing portion disengaged from the protruding rail part.