Collapsible device for a baby carriage

Claim 1

A collapsible device for a baby carriage comprising: a protective lateral rod pivotally connected between a front wheel rod and an inverted U-shaped push rod; two locking discs providing male joints firmly fixed with bottom ends of the inverted U-shaped push rod, each locking disc having a) two spaced fitting grooves for two tenons of a locking block to fit therein, and b) an opening between said two fitting grooves for an upper end of said front wheel rod to fit therein; two female joints combined with opposite ends of said protective rod, each female joint having i) a hollow chamber to receive said locking block which is biased elastically by a coil spring to fit within and move back and forth therein, ii) a fork portion with a middle opening to receive said locking disc therein by means of a pivot pin thereby connecting said fork portion with said locking disc, iii) a vertical opening in a bottom and two projecting ridges at both sides of said vertical opening to receive a guide block having two grooves to cooperate with said projecting ridges, and iv) a hole in one side thereof to receive a push button having a guide post with a sloped end surface; said locking block combined between said locking disc and said female joint, extending and moving in said hollow chamber of said female joint, and each locking block having aa) said two tenons at both sides of a rear end to engage or disengage from said two spaced fitting grooves of said locking disc, bb) a sloped surface at a side thereof to contact said sloped end surface of said guide post of said push button so that said locking block can be pushed back by said push button from 1) a locked position wherein said tenons engage said grooves of said locking disc, to 2) an unlocked position wherein said tenons disengage from said fitting grooves when said push button is pressed in said hole of said female joint, and cc) a sloped down surface contacting a top sloped surface of said guide block for said locking block to be guided, thereby to move back and forth therein; and said push button being manually pressed in to force said locking block to move to said unlocked position from said locked position, whereby said front wheel rods are allowed to be swung up relative to said inverted U-shaped push rod to collapse said baby carriage.