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A controlled equilibrium device comprising a housing; at least one spring, each at least one spring having a spring stiffness; and a load leveling device movable through the housing between a first maximum displacement position and a second maximum displacement position, the load leveling device com

A controlled equilibrium device comprising a housing; at least one spring, each at least one spring having a spring stiffness; and a load leveling device movable through the housing between a first maximum displacement position and a second maximum displacement position, the load leveling device comprising a deadband displacement zone defined between a first deadband displacement threshold and a second deadband displacement threshold, the displacement required to reach the first and second deadband displacement thresholds being less than the displacement distances required to reach the first and second maximum displacement positions, the at least one spring stiffness being substantially constant when the displacement of the load leveling device is within the deadband zone, the stiffness of the at least one spring being modified to a second stiffness when the load leveling device is equal to or beyond either the first deadband displacement threshold or the second deadband displacement threshold.

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A controlled equilibrium device comprising a housing; at least one spring, each at least one spring having a spring stiffness; and a load leveling device movable through the housing between a first maximum displacement position and a second maximum displacement position, the load leveling device com

A controlled equilibrium device comprising a housing; at least one spring, each at least one spring having a spring stiffness; and a load leveling device movable through the housing between a first maximum displacement position and a second maximum displacement position, the load leveling device comprising a deadband displacement zone defined between a first deadband displacement threshold and a second deadband displacement threshold, the displacement required to reach the first and second deadband displacement thresholds being less than the displacement distances required to reach the first and second maximum displacement positions, the at least one spring stiffness being substantially constant when the displacement of the load leveling device is within the deadband zone, the stiffness of the at least one spring being modified to a second stiffness when the load leveling device is equal to or beyond either the first deadband displacement threshold or the second deadband displacement threshold. cludes a chain lock means. 13. The accessory of claim 12 wherein said chain lock means includes a rectangular hollow passing through a wall of said adjunct in communication with a chain slot portion dimensioned to receive one chain's thickness therein defining said chain lock. 14. A lifting jack accessory in which the lifting jack includes an elongate, perforated standard, a ratcheting mechanism overlying the standard, the ratcheting mechanism including a load engaging nose operatively coupled to a ratcheting handle, said accessory comprising, in combination: a sleeve having first and second ends and an adjunct projecting from a side of said sleeve including means for engaging other objects therewith, wherein said sleeve overlies the standard, and wherein said sleeve includes a pair of holes through which a pin is removeably attached, said pin passing through the standard. 15. The accessory of claim 14 including a lanyard attached to said pin and threaded through a fenestration on said adjunct for retaining said pin on said accessory, and a locking clip at an end of said lanyard for attaching and fixing said pin thereto.