Gravity-independent constant force resistive exercise unit

A constant force resistive device, comprising:

• a hollow body containing:
• a plurality of modular resistive packs, each of said packs comprising at least one constant torque spring,
• each spring being attached to a separate storage drum within said pack, being wound upon said storage drum according to its normal curvature, with each spring within a pack having its free end mechanically attached to a single output drum within that pack, upon it can be wound in opposition to its normal curvature;
• each of said packs having independent means for mechanically connecting said output drum to an output shaft for said pack,
• wherein each of said output shafts are adapted for mechanical interconnection to the shafts of the adjacent packs, and
• the interconnected output shafts of all said packs form a unitary output shaft mechanically connected to a cable drum,
• with mechanical selection means provided for connecting any or all of said output drums of said modular packs to said output shaft, thereby providing resistance to the withdrawal of a cable wound upon said cable drum.

A constant force resistive device comprising a hollow body set upon a base,

• said base having mounted thereon a cable drum with cable wound thereon;
• a plurality of constant torque spring resistive packs mounted upon said base and parallel thereto in stacked fashion,
• each spring resistive pack comprising a central output drum and a plurality of storage drums on the circumference of said central drum, with
• each storage drum containing a constant torque spring whose free end can be selectively mechanically attached to said central output drum, and
• each resistive pack having mechanical selection means comprising lever and cam means for selectively engaging any of said springs in said pack;
• each said central output drum being mechanically connected to a central output shaft, and
• said output shaft being mechanically connected to said cable drum so as to provide a resistive force to the withdrawal of said cable when at least one of said constant torque springs is engaged.