Connector with locking arm having groove on surface facing connector housing

A connector (A) having a connector housing (10) and a locking arm (11) formed integrally with an outer surface (10A) of said connector housing (10),

• said locking arm (11) including a base part (12) erected from said outer surface (10A) of said connector housing (10);
• an arm part (13) cantilevered and extended from said base part (12) substantially parallel with said outer surface (10A) of said connector housing (10);
• and a flexure space (15) provided between said outer surface (10A) of said connector housing (10) and an inner surface (13B) of said arm part (13), to enable elastic flexing of said arm part (13) when said connector (A) and a mating connector are locked to each other,
• wherein a groove (16) is formed on a surface (12R) of said base part (12) facing said flexure space (15) and a groove (18) is formed on a surface (13B) of said arm part (13) facing said flexure space (15) such that said groove (16) formed on said base part (12) extends along a direction in which said base part (12) is erected and said groove (18) formed on the arm part (13) extends along a direction in which said arm part (13) is extended;
• and a sectional configuration of said groove (16) formed on said base part (12) and that of said groove (18) formed on said arm part (13) include a curve and are smoothly continuous with each other.