COMPRESSION SPRING ROD

摘要

A compression spring rod (10, 100, 180) for relatively displacing elements attached to end mounts (18, 20, 132, 134, 220, 222) of the rod assembly comprises a housing (24, 104, 186) having a rod member (22, 102, 182, 184) moveable between extended and retracted positions relative thereto, and a first compression spring (28, 108, 188) in the housing (24, 104, 186) surrounded by a second compression spring (30, 110, 190) for biasing the rod member (22, 102, 182, 184) to one of an extended or retracted position relative to the housing (24, 104, 186). The two springs (28, 108, 188, 30, 110, 190) are oppositely wound, of different length, of different outside diameter, and of different wire diameter whereby, from a compressed condition, the spring rod (10, 100, 180) exerts an expansion force which increase at a linear rate. Two sets of the springs (28, 108, 188, 30, 110, 190) can be arranged for biasing the rod member (22, 102, 182, 184) to a central position relative to the housing (24, 104, 186).