Patent ID: 7395578

Claim:
A joint device for joining to a wiper arm of car windshield comprises: a gripping cabin, which comprises a top surface, a front side, a left side, a right side and a rear side, wherein, a hollow opening perforates through at a junction of said top surface and said front side; a rectangular hollow bin, which is downwards built on an inner side of said top surface such that its bottom side is longer than the bottom edge of said left side and said right side, has a pair of parallel and symmetrical left groove and right groove created between its both outer sides and said left side and said right side respectively; a pair of parallel and symmetrical elastic round notches are indented on both outer sides of the central portion of said bottom side; a horizontal cantilever is projected at its side towards said hollow opening; a vertical elastic hook is erected on a free end of said cantilever; and a horizontal buckling nose is raised at a tip towards said rear side; a snap-on lug is protruded on each junction of rear side respectively with both of said left side and right side; a slant top is downwards formed at a top of said snap-on lug; a slant side is formed at a side of said snap-on lug, backwards said rear side; the included angle intersected by both of said slant top and slant side equals that being intersected by both of a bottom edge and end brim on a head of said wiper arm when said gripping cabin is joined to said head; and a chassis, which comprises a bottom panel, a left panel and a right panel; wherein, a fixing hole is punched at the center of said bottom panel; a pair of parallel and symmetrical insetting clips are downwards created at two sets of both sides, which are at the front and rear of said chassis respectively; wherein said left panel and said right panel are upwards erected at both sides of said bottom panel and are parallel and symmetrical with one another; a horizontal fixing spindle is bridged at a central position in both of said left panel and right panel.