Waqar Coil Spring

History of Spring
Coiled springs appeared early in the 15th century, in door locks. The first spring powered-clocks appeared in that century and evolved into the first large watches by the 16th century.
In 1676 British physicist Robert Hooke discovered the principle behind springs' action, that the force it exerts is proportional to its extension, now called Hooke's law.
Types of coil spring are:
• Tension/extension coil springs, designed to resist stretching. They usually have a hook or eye form at each end for attachment.
• Compression coil springs, designed to resist being compressed. A typical use for compression coil springs is in car suspension systems.
• Torsion springs, designed to resist twisting actions. Often associated to clothes pegs or up-and-over garage doors.