Patient transport apparatus having caster assembly biasing mechanisms

A patient transport apparatus comprising:

• a support structure movable between a support configuration for traversing floor surfaces and a stowed configuration for storage;
• and
• a caster assembly operatively attached to the support structure for concurrent movement between the support configuration and the stowed configuration, the caster assembly including:
• a caster frame arranged for pivoting movement relative to the support structure between a plurality of caster orientations including a stowed caster orientation,
• a wheel coupled to the caster frame and arranged for engagement with floor surfaces when the support structure is in the support configuration, and
• a biasing mechanism interposed between the caster frame and the support structure to urge the caster frame toward the stowed caster orientation in response to disengagement between the wheel and floor surfaces occurring as the support structure moves from the support configuration to the stowed configuration.