Transmission assembly and lifting column

A transmission assembly, comprising:

• a hollow spindle, an outer wall of which is provided with an outer thread;
• a transmission worm disposed in the hollow spindle, wherein the transmission worm is synchronously rotatable with the hollow spindle and the transmission worm is telescopable relative to the hollow spindle in an axial direction;
• a first transmission nut which is thread-fitted with the transmission worm, wherein the hollow spindle is rotatably positioned relative to the first transmission nut in the axial direction, and an external portion of the first transmission nut is provided with a locking structure for limiting the first transmission nut from rotating, and when the hollow spindle is rotated, the locking structure limits the first transmission nut from rotating;
• a second transmission nut which is thread-fitted with the hollow spindle;
• a bushing which is bushed outside of the hollow spindle, the second transmission nut being fixedly connected with the bushing;
• and
• a guide tube which is rotatably disposed in the bushing, wherein the guide tube is synchronously rotatable with the hollow spindle, and the guide tube is telescopable relative to the hollow spindle in the axial direction.