Wiper arm

A wiper arm for driving a wiper blade to wipe a windshield of a vehicle comprising:

• an arm head connectable to an outside driving member;
• a retainer having a base portion rotatably connected to said arm head by a shaft, said base portion having
• a top wall,
• a rear wall having a side edge adjacent the top wall, and
• a front wall having a first side edge adjacent the top wall and a second side edge spaced apart from the top wall,
• said front wall having an inclining surface extending toward said windshield such that the second side edge is further from the rear wall than said first side edge;
• an arm piece fixed to said retainer along said top wall for holding said wiper blade at one end;
• and
• a spring disposed between said arm head and said retainer to urge said retainer toward said windshield, wherein
• said arm head and said base portion of said retainer have a common longitudinal center line spaced apart from said top wall, said front wall and said rear wall,
• said retainer comprises a member for positioning one end of said spring on said common longitudinal center line, and
• the other end of said arm piece comprises a bent support extending apart from said rear wall and said top wall across said common longitudinal center line to fix the other end of said spring on said longitudinal center line, thereby aligning said spring with said common longitudinal center line.