Connector housing with lock

A locking device for an electrical connector housing, comprising:

• a lock arm disposed on a single outer wall surface of the connector housing, said lock arm having a front portion and a rear portion arranged in a longitudinal direction of said lock arm;
• a retaining projection, disposed on an upper portion of said lock arm, for engaging a retaining portion of a mating connector housing;
• an unlocking portion, disposed on said upper portion of said lock arm rearward of said retaining projection, for releasing engagement of said connector housing with the mating connector housing;
• a pair of protective walls, disposed vertically on said outer wall surface of said connector housing, for protecting lateral portions of said lock arm, front inner wall surfaces of said protective walls respectively supporting both lateral sides of said front portion of said lock arm;
• a resilient band portion having a support portion, integrally formed with said rear portion of said lock arm, supported on said outer wall surface by said support portion, said band portion being substantially U-shaped, wherein said protective walls extend in said longitudinal direction from said front portion toward said rear portion such that said lock arm is disposed therebetween and protected thereby;
• and
• reinforcing ribs, disposed projecting from edges of a lower portion of said lock arm for reinforcing said lock arm, said reinforcing ribs tapering from said front portion of said lock arm to said rear portion of said lock arm such that a height of each of said ribs is greater at said front portion than at said rear portion.