Pull rod structure of a baggage cart

Claim 1

A pull rod structure of a baggage cart, comprising a handle body, a controlling mechanism, a lower cover, a transmission mechanism, a linking mechanism, two hollow tube members and two sleeve members, wherein: said handle body has two ends each of which is formed with a through hole, an insert hole being formed beside each said through hole and a locking channel being formed under said insert holes, several thread holes being disposed in said locking channel; said controlling mechanism includes a pull lever, two locking blocks, two long pins, two short pins and two springs, said pull lever being U-shaped and disposed on one side and said handle body, having two bent free ends, a driving block being formed on a middle section of said pull lever and two pin holes being formed on each of said two bent free ends of said pull lever, each said locking block receiving a respective one of said springs and said pull lever, each said short pin being inserted into a pin hole of a respective one of blocks said locking and a pin hole of said pull lever and through a respective one of said springs so as to fix said pull lever with each said locking block; said lower cover is disposed under said handle body, having two ends each of which is formed with a recess for fitting a respective one of blocks said locking therein, an insert block being disposed beside each said recess and several thread holes and screws being disposed through said lower cover corresponding to said thread holes of said handle body for fixedly connecting said lower cover with said handle body; said transmission mechanism includes a pressing lever, a second spring and a locating block, said pressing lever having a top mushroom cap and a lower thread end, said locating block being disposed at a lower end of said second spring, making the same fixedly connected with an upper end of one of said hollow tube members, said second spring being positioned under said mushroom cap of said pressing lever; said linking mechanism includes a slant triangular block having a tapered lower end, a valve seat, a third spring, a pad member, a fixing sleeve and a fixing plate said slant triangular block having a slant side and said valve seat having a slant side corresponding to said slant side of said slant triangular block, said valve seat being formed with a lower lateral notch for disposing said third spring therein, said valve seat being further formed with a projection opposite to said notch, said pad member being disposed under said valve seat, said fixing sleeve being formed with a lateral orifice for said projection of said valve seat to extend outside therethrough, said fixing plate being fitted into a lower end of said fixing sleeve; each said hollow tube member is inserted into a respective one of said through holes of said handle body and a lower end of said one of said hollow tube members is inserted over said fixing sleeve; and each said sleeve member is disposed outside a respective one of said hollow tube members and formed with several lateral locating holes.