초록 ▼

A stretchable and foldable cart whose handle bar can be stretched, retracted or folded by operation of a pressing rod associated with positioning elastic lugs, pins and stoppers. The loading stage of the car is able to adjust its size according to actual requirements by the operation of push button,

A stretchable and foldable cart whose handle bar can be stretched, retracted or folded by operation of a pressing rod associated with positioning elastic lugs, pins and stoppers. The loading stage of the car is able to adjust its size according to actual requirements by the operation of push button, positioning stoppers and connecting rods. The front and rear mountings of cart are made of plastics with sufficient engineering strength for reducing the cart weight yet without affecting the cart's functions; facilitating assembly work and reducing production cost.

대표청구항 ▼

[ What is claimed is:] [1.] A stretchable and foldable cart, comprisinga loading stage which comprises a front and a back mounting, a pair of fixed caster holders for rotatably mounting two casters underneath said back mounting, a pair of swiveling caster holder for rotatably mounting another two ca

[ What is claimed is:] [1.] A stretchable and foldable cart, comprisinga loading stage which comprises a front and a back mounting, a pair of fixed caster holders for rotatably mounting two casters underneath said back mounting, a pair of swiveling caster holder for rotatably mounting another two casters underneath said front mounting, a plurality of square bushings extensibly connected between said front and back mountings, two lateral rods transversely connected under said square bushings so as to support said front and back mountings, and a control unit for adjusting a distance between said front and back mountings by selectively adjusting a length of each of said square bushings, wherein said control unit comprises a push button base installed in a square slot provided on said front mounting, a push button placed inside said push button base, a spring disposed between said push button base and said push button, two connecting rods, and two positioning stoppers, wherein one end of each of said two connecting rods is attached to each side of said push button while another end of each of said two connecting rods is attached to a follower through an inner part of one of said sqaure bushings, thereby to adjust said distance between said front and back mountings, press down said push button in said square slot provided on said front mounting for removing said connecting rods onwards, resulting in a displacement of said followers and causing two plungers, which are equipped with said two followers through two positioning stoppers respectively, to be released from an original position thereof and engaged with said square bushings respectively; anda handle bar unit which comprises two bushing bases spacedly affixed on of said back mounting, two bushings, two positioning stoppers, two lug bases, a pressing rod supported between said two bushings, and a handle bar, each of said bushings has an upper end engaged with one of said lug bases while a lower end of each of said bushings is engaged with one of said two positioning stoppers, wherein said two positioning stoppers are pivotally mounted on said two bushing bases and said handle bar has two ends penetrate through said two lug bases, wherein said pressing rod comprises a lower rod having two ends connected to two recessed slots provided on said two bushing base respectively and an upper rod having two ends connected two positioning elastic lug provided on said two lug bases resepctively, wherein by pressing down said pressing rod, said positioning elastic lugs are pressed by said upper rod, so that a positioning pin protruded from each said end of said handle bar and connected to a terminal of said positioning elastic lug is forced to trip out of a fixed position thereof for allowing said handle bar to stretch or retract, moreover said lower rod of said pressing rod is forcibly pulled upwards, and two ends of said lower end are respectively pulled into two recess slots provided on said two positioning stoppers installed at said two lower ends of said two bushings by a resilient force of said two springs which are mounted between said two ends of said lower rod and said two bushing bases respectively, so that in order to fold up said handle bar and said bushings, by pressing said pressing rod down, said lower rod is separated from said recess slots of said position stopper and said handle bar unit is released and said bushings are freee to fold forwards with respect to said bushing bases as two supporting points respectively.