Connector having a retainer with outer surface flush with outer surface of the connector housing

1. A connector comprising:

a terminal;

a housing body comprising a terminal housing chamber inside which the terminal is housed;

an opening portion formed at an outer peripheral surface of the housing body;

a retainer having a locking protrusion that protrudes into the terminal housing chamber to lock the terminal housed in the terminal housing chamber when the retainer is fitted to the opening portion; and

a hinge that connects the retainer to the housing body so as to allow the retainer to turn between an open position at which the opening portion is opened and a closed position at which the retainer is fitted to the opening portion to close the opening portion,

wherein, when the retainer is in the closed position, an outer surface of the retainer is flush with the outer peripheral surface of the housing body.

2. The connector according to claim 1 , wherein the housing body further comprises a chamfered corner extending in a longitudinal direction of the housing body, and

wherein the retainer and the hinge each has a chamfered portion which extends continuously from the chamfered corner of the housing body when the retainer is in the closed position.

3. The connector according to claim 1 , wherein, in a state in which the retainer is in the closed position, the retainer forms a part of an exterior wall of the housing body and a part of an interior wall of the terminal housing chamber.

4. The connector according to claim 1 , wherein the housing body is configured to fit into a hood portion formed in a housing of a counterpart connector to which the connector is coupled, and

wherein a front side of the retainer in a direction in which the housing body is fitted into the hood portion is connected to the housing body via the hinge.

5. The connector according to claim 1 , wherein the retainer comprises a base end at which the retainer is connected to the housing body via the hinge and a free end on a side opposite to the base end, the free end being opposed to a locking surface forming the opening portion in a state in which the retainer is in the closed position,

wherein one of the free end of the retainer and the locking surface of the opening portion comprises at least one locking portion at which the other of the free end of the retainer and the locking surface of the opening portion is locked, and

wherein one of the free end of the retainer and the locking surface of the opening portion comprises a recessed portion that forms a hole portion between the recessed portion and the other of the free end of the retainer and the locking surface of the opening portion.

6. The connector according to claim 5 , wherein the base end of the retainer is on a front side of the retainer in a direction in which the terminal is inserted into the terminal housing chamber.

7. The connector according to claim 6 , wherein the free end of the retainer comprises a thick walled portion that abuts against the locking surface of the opening portion.

8. The connector according to claim 6 , wherein a rotation regulating surface is provided on a wall surface of the opening portion to which the retainer is connected via the hinge, the rotation regulating surface being configured to regulate a rotation of the retainer when the locking protrusion of the retainer abuts against the rotation regulating surface, and

wherein the rotation regulating surface is provided at a locking position of the terminal at which the terminal is locked by the locking protrusion of the retainer.