Variable transmission drive pulley assembly with selective drive

A variable transmission drive pulley assembly comprising a drive shaft, a first sheave fixedly connected to said drive shaft for common rotation therewith, a second sheave movably carried on said drive shaft for common rotation therewith and for movement axially thereof from a retracted position spaced from said first sheave, means urging said second sheave toward said retracted position in the direction away from said first sheave, a member carried on said drive shaft for common rotation therewith and for movement axially thereof relative to a predetermined position, means biasing said member toward said predetermined position in the direction toward said first sheave, means carried by said second sheave and said member for displacing said second sheave and said member away from each other in response to drive shaft rotation, releasable means for preventing movement of said second sheave from said retracted position in the direction toward said first sheave, releasable means for preventing movement of said member from said predetermined position in the direction away from said first sheave, and selectively operable means for actuating said releasable means so as to prevent movement of said second sheave from said retracted position toward said first sheave, to prevent movement of said member away from said predetermined position in the direction away from said first sheave while permitting movement of said second sheave from said retracted position in the direction toward said first sheave, and to permit movement of said second sheave from said retracted position in the direction toward the fixed sheave while also permitting movement of said member from said predetermined position in the direction away from said first sheave.