Load balancer in different forms

Spring balancer lets a tool or weight hang from a spring hook.The tools balancer uses the force of the spring to make the suspended object weightless. Spring tools balancer is a kind of environmental protection tool. The retractor makes full use of the mechanical principle of the spring,when the spring balancer is working, no other power is required,no waste gas or noise. The tools balancer works at a low cost,because it doesn't require any mechanical help, like electricity,