When lifting heavy objects, the hand zipper makes the key wheel rotate clockwise, and the sprocket moves inward along the thread on the disk sleeve. The ratchet wheel and the friction disc are pressed on the sprocket shaft (the sprocket shaft and the disk firmly into one), the ratchet ring can only rotate clockwise, the pawl on the ratchet ring jiggling sound, the sprocket right gear drive gear (also known as planetary gear) and the fixed ring mesh, so that the gear along the sprocket shaft in the center of the line The lifting chain is lifted by turning the driving mechanism and the lifting sprocket in the clockwise direction. When the lifting chain is not pulled, the weight is self-locking caused by self-weight and the pawl prevents the ratchet ring from turning counterclockwise and stops in the air.
Conversely, when the weight is released, the hand zipper causes the sprocket to rotate counterclockwise, the chain moves outward along the threads on the disk sleeve, and the ratchet ring friction disc and the threads on the disk sleeve move outward, while the ratchet ring friction disc and the disk sleeve are separated, then the gear at the right end of the sprocket shaft and the drive gear mesh with the fixed gear. The gear rotates counter-clockwise along the chain shaft as the center, driving the driving mechanism and the lifting sprocket to rotate at the same time, so that the lifting chain drops. When the sprocket stops turning after the pulley is not pulled, the lifting sprocket transmission mechanism also continues to rotate counter-clockwise, so that the disc friction disc ratchet rings compress each other. The ratchet ring can not rotate counterclockwise by the pawl tissue, so the friction produces self-locking on the thread and stops the weight in the air.