Loading platform (1), the handle (2), rotating frame (3), caster fork (4), provided with casters (5), the handle (2) is fixed to an upper portion of the loading platform (1) by a connecting structure, the connection structure left joint (14), the right joint (15), the left wheel seat (12) includes a right wheel seat (13) and a handle lock mechanism, the handle lock mechanism crossbar (7), the locking block (8), coupling bar (9) comprises a switch (10), a spring (11), the crossbar (7) has one end supported by the left gear seat (12), the other end is supported by the right gear seat (13) a hollow tube, one end of the crossbar (7), along its extending direction slidable one end connecting rod (9) connected to one end and the other end in the left joint (14 ') and the left lock both are inserted into the gear seat (12) Lock block (8) is provided which can be click, connecting rod (9) is mounted in the hollow portion of the crossbar (7), the other end is connected to a switch (10), similarly, the cross bar (7) structure of the other end is also similar, between two switches (10) spring (11) is provided, truck casters not retract when the handle is rotated. According to the present invention, it is not necessary to house the caster when the handle is rotated.
.FIELD 1
@ 0001