Patent ID: 6533489
Filing Date: 2003-03-18
Classification: A47C,F16C,Y10T

Abstract:
A 180-degree folding support joint, which comprises a pair of joint members foldably and pivotally connected to each other and a pair of frame legs affixed on said two joint members respectively in such a manner that in a folded condition, one of said frame legs is pivotally rotated 180 degrees towards the other frame leg in order to pivotally fold said frame legs together in a parallel manner, and in an unfolded condition, each of said joint members is biased against each other to lock up the rotation of said joint members so as to align said frame legs with each other;wherein each of said joint members has a U-shaped cross-sectional structure and comprises: an outer wall and an inner wall integrally extended therefrom to define an engaging slot therebetween and a blocking surface provided on a bottom surface of said engaging slot; a bottom portion wherein a shaft is transversally extended through said bottom portion of each of said joint member in such a manner that each of said joint members is capable of pivotally rotating about the shaft within 180 degrees; and a blocking wall integrally and horizontally extended on a side of said respective joint member for biasing against said outer wall of other said joint member so as to limit the rotation of each of said joint members in said unfolded condition; wherein in said unfolded condition, said inner wall of each of said joint members is pivotally engaged with said engaging slot of other said joint member, and biased against said respective blocking surface of said engaging slot so as to lock up the rotation of other said joint member so that said two frame legs are aligned with each other; wherein in said folded condition, each of said joint members is pivotally rotated about said shaft in an opposite direction in such a manner that said frame legs are adapted for rotating totally 180 degrees so that said frame legs are folded up to be parallel with each other.