Tricycle drive train

Claim 1

A unitary drive train attachment for converting a conventional pedal-powered bicycle to a tricycle having a front steering wheel and two pedal-controlled rear wheels to selectively and evenly provide driving, free-wheeling and braking action at both of said rear wheels in response to pedal action, said attachment comprising: a. a central housing member adapted to be received between the rear-wheel fork of said bicycle and secured thereto without modification thereof by bolts extending through the fork members in place of the conventional rear-axle stubs; b. a pair of rear-axle housing members having inner ends thereof secured to and extending laterally from said central housing member; c. a pair of rear-axle half-shafts, each journaled for rotation within a respective one of said rear-axle housing members, the outer ends of said shafts extending laterally from said housing members and the inner ends thereof extending into said central housing member; d. substantially enclosed within said central housing member, 1. coaster brAke means journaled in said central housing member, and 2. differential means for transmitting motive and braking power to said inner ends of said half-shafts; e. a pair of conventional front bicycle wheels, each carried by and fixed to said outer ends of said half-shafts for rotation therewith; and f. drive chain - sprocket means for transmitting motive and braking power from the pedal crank of said bicycle to said coaster brake means and from said coaster brake means to said differential means, said elements constituting a unitary drive train attachment for converting a bicycle to a tricycle by attaching said housing to said rear fork.