seat spring, sofa spring,zigzag spring

we can supply customer all kinds of springs according to their quirments.

about seat spring, sofa spring,zigzag spring

Extension springs are the direct opposite of compression springs, in that they are close-coiled helical springs that extend under a pulling force. When designing extension springs consideration must be given to stress due to initial tension, stress and deflection of hooks, special coiling methods, secondary operations, and allowance for over-stretching at assembly.