Wheel reversing mechanism and cart frame

A cart frame, comprising:

• a main body and a wheel reversing mechanism on the main body;
• wherein the wheel reversing mechanism comprises:
• a frame, a wheel assembly, and a linkage assembly disposed at least partially within the frame,
• wherein the linkage assembly comprises a locking mechanism and an actuator cooperated with the wheel assembly, and the wheel assembly comprises a wheel joint and a wheel connected to the wheel joint;
• wherein the wheel joint is rotatably connected to a lower end of the frame, the actuator is connected to the wheel joint, and the locking mechanism is locked to the wheel joint;
• wherein when the linkage assembly is acted by an external force, the locking mechanism is unlocked from the wheel joint so that the actuator controls the wheel joint to rotate relative to the frame;
• wherein the locking mechanism comprises an upper gear rack, a lower gear rack, a gear that is respectively engaged with the upper gear rack and the lower gear rack, and an internal fixing plug provided within the frame, a locking member compatibly locked to the wheel joint is provided at a lower end of the lower gear rack;
• wherein the upper gear rack, the lower gear rack and the gear are equipped within the internal fixing plug, and the gear is rotatably connected into the fixing plug by means of a pin;
• and
• wherein the wheel assembly of the wheel reversing mechanism is rotatable relative to the main body upon the action of the linkage assembly.

An apparatus comprising:

• a main body and a wheel reversing mechanism on the main body;
• wherein the wheel reversing mechanism comprises:
• a frame, a wheel assembly, and a linkage assembly disposed at least partially within the frame,
• wherein the linkage assembly comprises a locking mechanism and an actuator cooperated with the wheel assembly, and the wheel assembly comprises a wheel joint and a wheel connected to the wheel joint;
• wherein the wheel joint is rotatably connected to a lower end of the frame, the actuator is connected to the wheel joint, and the locking mechanism is locked to the wheel joint;
• wherein the locking mechanism is configured to be unlocked from the wheel joint so that the wheel joint is rotatable relative to the frame;
• wherein the locking mechanism further comprises an upper gear rack, a lower gear rack, a gear that is respectively engaged with the upper gear rack and the lower gear rack, and an internal fixing plug provided within the frame, a locking member compatibly locked to the wheel joint is provided at a lower end of the lower gear rack;
• and
• wherein the upper gear rack, the lower gear rack and the gear are equipped within the internal fixing plug, and the gear is rotatably connected into the fixing plug by means of a pin.