Trailer bike

"[1] The rider of a trailer bike usually has a saddle, handlebars, and pedals.

The trailer bike was patented by Canadian entrepreneur Delbert Adams in 1987.

[2][3] Adams started the manufacturer of trailer bikes, Trail-a-Bike, and began selling them in the early 1990s,[4] although the same concept had been previously independently and imitatively invented by others at least as far back as the 1930s with the Rann Trailer.

A trailer bike is attached to a bicycle at either the seatpost or on a special rear rack by a linkage that allows for pivoting.

Alternatively, the hitch mechanism may rotate using the seatpost as the pivot.