Patent ID: 8146936

Claim:
A child trailer, comprising: a body including a plurality of wheel assemblies at the bottom thereof; a joint assembly which is located in front of the body and includes a pair of holding ducts coaxially located at a front end of the body, each holding duct including a plurality of splines on an inner rim, the two holding ducts being interposed by a coaxial coupling duct, the coupling duct including a plurality of slots on an inner wall corresponding to the splines, the holding ducts and the coupling duct being run through by a telescopic sleeve inside, two outer ends of the telescopic sleeve being coupled with a pair of tooth ducts, each tooth duct including a tooth portion on an outer wall thereof latchable on the splines of the holding duct and the slots of the coupling duct; and a coupler which is fastened to a front end of the joint assembly and includes a seat, a first adjustment arm and a second adjustment arm, the seat including a slide rail in the front end and being fastened to a front end of the coupling duct, the first and second adjustment arms including respectively a penetrating passage coupling symmetrically on the slide rail and a clamp means located at an outer side of each of the first and second adjustment arms, the clamp means including a first clamp and a second clamp engageable with each other.