Travel bed

A travel bed, having an unfolded state and a folded state, and comprising a bottom support, an upper surrounding frame, a plurality of stand rods provided between the bottom support and the upper surrounding frame, and fixing bases provided at lower portions of the plurality of stand rods respectively, the bottom support comprising a plurality of bottom rods and a connecting base rotatably connected with ends of the plurality of bottom rods, the other ends of the bottom rods being connected with the fixing bases, wherein,

• the upper surrounding frame comprises a first surrounding rod and a second surrounding rod which are rotatably connected with a first connector respectively, and an upper end of the stand rod is fixedly connected with the first connector;
• the first surrounding rod comprises a first connecting rod and a second connecting rod of which end portions are rotatably connected via a second connector, and the second surrounding rod comprises a third connecting rod and a fourth connecting rod of which end portions are rotatably connected via a third connector;
• the upper surrounding frame further comprises a first locking device for locking the first connecting rod and the second connecting rod to each other, and a second locking device for locking the third connecting rod and the fourth connecting rod to each other;
• the first locking device is provided on the second connector, the second locking device is provided on the third connector, and the first locking device and the second locking device are linked with each other via a hauling rope;
• during folding, when one of the first locking device and the second locking device is unlocked, the other locking device is unlocked simultaneously, the connecting base is driven to move upwardly by pressing the upper surrounding frame downwardly, and the upper surrounding frame, the stand rods and the bottom rods of the travel bed get close to one another;
• during the unfolding and folding of the travel bed, the stand rods move while keeping upright;
• the first locking device comprises a first locking unit for locking the first connecting rod and the second connecting rod to the second connector respectively, and a first unlocking unit for unlocking the first locking unit, the second locking device comprises a second locking unit for locking the third connecting rod and the fourth connecting rod to the third connector respectively, and a second unlocking unit for unlocking the second locking unit, two end portions of the hauling rope are connected to the first unlocking unit and the second unlocking unit respectively, and the first locking unit and the second locking unit are unlocked simultaneously when the first unlocking unit is conducted an unlocking operation,
• the first locking unit comprises a first swaying block of which an end portion is rotatably connected with the second connector, and a first locking block fixed on an end portion of the first connecting rod or an end portion of the second connecting rod and rotatably connected with the second connector, the first swaying block and the first locking block are pressed against each other when the first locking unit is in a locked state, and the first swaying block and the first locking block are separated from each other when the first locking unit is in an unlocked state,
• the second locking unit comprises a second locking block fixed on an end portion of the third connecting rod or an end portion of the fourth connecting rod and rotatably connected with the third connector, a second swaying block of which an end portion is rotatably connected with the second locking block, and a connecting block rotatably connected with the other end portion of the second swaying block and with the third connector respectively, the third connector, the second locking block, the second swaying block and the connecting block form a four-bar linkage mechanism, and the second locking unit is in a locked state when the four-bar linkage mechanism is at a dead point position,
• wherein the first unlocking unit comprises an unlocking handle knob slidably provided on the second connector along an up-down direction, a first sliding slot provided on the unlocking handle knob and extending along the up-down direction, a second sliding slot provided on the second connector and extending along a horizontal direction, and a first pin provided on the other end portion of the first swaying block, the first sliding slot comprises a tilted slot extending along the up-down direction, the first pin is able to slidably pass through the first sliding slot and the second sliding slot along the first sliding slot and the second sliding slot, and when the unlocking handle knob slides, it drives the first pin to slide in the first sliding slot and the second sliding slot, and drives the first swaying block to rotate to press against the first locking block or be separated from the first locking block.