Variable resistance device

A variable resistance device configured to generate a variable resistance force, said variable resistance device comprising:

• a first body element;
• a second body element;
• and
• a force-generating system disposed between said first and second body elements,
• said force-generating system including a resiliently deflectable beam, an interface element, and a cam,
• said resiliently deflectable beam extending relative to the first body element and toward the second body element,
• said resiliently deflectable beam presenting a distal region spaced from the first body element,
• said interface element being disposed at the distal region of the resiliently deflectable beam,
• said cam projecting relative to the second body element and toward the first body element,
• said cam presenting a variable cam surface,
• said interface element configured to shift along the cam surface upon application of a driving force to at least one of said first and second body elements relative to the other of said first and second body elements and consequent shifting of said first and second body elements relative to each other,
• wherein shifting of said interface element along the cam surface results in corresponding bending of the resiliently deflectable beam and consequent generation of a resistance force by said resiliently deflectable beam,
• said cam surface presenting a variable, irregular engagement profile that varies irregularly along a length thereof, such that the interface element moves irregularly along the variable, irregular engagement profile upon application of the driving force, and such that the resistance force generated by the resiliently deflectable beam varies irregularly as the interface element moves irregularly along the variable, irregular engagement profile.