The parts made of serpentine spring elastic material deform under the action of external force, and return to normal after removing the external force. Also known as "spring". The serpentine spring is flat. When the round wire strikes, it sends half an arc, and it is serpentine. Serpentine springs are made of the elasticity of materials and elastic mechanical parts, one is elastic, the other is tension. The serpentine spring comprises a spring body with head and tail on both sides, and a stress hole at the bending part of the spring body surface; There is a slot at one end of the head end, the rotatable connector is installed in the slot body, and the card block and connector slot are set at the end of the welding card at one end of the connector; The technical point is to design a clamp at the head end of the spring body, which can insert the whole spring body into the corresponding slot, and use the elastic restoring force generated by the spring body to ensure the stability after connection, so as to facilitate the spring body in different states; The stress hole is designed at the bending part of the spring body, which can offset part of the stress generated at the position, facilitate the assembly with other springs, and reduce the loss of raw materials for chopsticks production.

Serpentine spring is also called coupling spring. The serpentine spring coupling is a kind of metal with advanced structure. It transmits torque distance through serpentine spring. The serpentine spring coupling is an advanced shaft-connected transmission component in the international machinery field, and is also a very common shaft-connected transmission component. In the mechanical transmission system, serpentine spring has the functions of transmitting torque and buffering, strong shock absorption, long service life, large range of variable load, safe starting, high transmission efficiency, reliable operation, low noise, simple wetting structure, convenient loading and unloading, and large installation error.