Patent ID: 7353562

Claim:
A joint apparatus of car windshield wiper arm, comprising: an upper cover body, which comprises a front top surface, a rear top surface, a front side, a left side, a right side and a rear side, wherein a guiding gap, which is concaved between said front top surface and said rear top surface, has a adjacent round groove receptacle indented at its bottom portion towards said front top surface; said front side and said front top surface joint internally together to make a solid core inside; a distance exists between both sides upright of a bottom side of said core and said left side as well as said right side for creating a left groove cut and a right groove cut, respectively; a round groove cut with V-shaped cross-section is concaved near said front side; a back-end face is upwards created by extending the bottom side of said core backwards some distance then bending vertical up in junction with the bottom section of said guiding gap; an erecting face is formed at a center in a front edge joint of said rear top surface and said guiding gap, so that the space between said erecting face and said back-end face of said core encompasses a hollow socket at the central bottom of said guiding gap; said left side and said right side joint with said rear side respectively, and an erecting hollow groove is indented inside of said rear side, wherein a horizontal elastic embed hook is built at the center between said rear side and said erecting hollow groove, and a horizontal insetting nose is raised at a central wall of said erecting hollow groove; and a chassis having a bottom plate, a left plate, a right plate and a rear plate; wherein, a fixing hole is perforated at the center of said bottom plate; a pair of parallel and symmetrical inset clips is concaved between said fixing hole and front edge of said bottom plate; said left plate and right plate are extending upwards at both sides of said bottom plate in parallel and symmetrical pair; an upright curbing plate is formed by bending the rear end of said bottom plate upwards; a horizontal fixing pivot is bridged between said left plate and said right plate near the front end; an upright hollow plug is encompassed by extending middle section of said left plate and said right plate backwards in joint with said rear plate; and an insetting hole is perforated at the center of said rear plate.