Patent ID: 7192391
Filing Date: 2007-03-20
Classification: A63B

Abstract:
1. A method of selecting different numbers of extension springs to resist movement of an element that moves against spring resistance, the method comprising: operatively connecting one end of each of the springs to a common connector; operatively connecting another end of each of the springs to a respective one of a plurality of links arranged in a stack extending in a direction of the movement of the element; arranging a link connector to extend in the direction of the link stack so that any selected one of the links in the stack can be connected to the link connector: moving the element to cause relative movement between the link connector and the common connection; and arranging the connection of a selected one of the links to the link connector, without any change in the spring end connections, to determine which of the links of the link stack that are not connected to the link connector will deploy their respective springs to resist the relative movement and which of the links of the link stack that are not connected to the link connector will not deploy their respective springs to resist the relative movement.