Abstract: This invention relates to a traction device adapted to be slipped onto a lower-leg end of a Thomas splint and including resilient walls to provide a sufficient friction fit with said splint that the traction device will not fall off of the splint by its own weight but which may be readily manually removed from the splint. The traction device includes a socket which receives the splint and has two cylindrical housings molded integrally with the socket. The cylindrical housings form bearings and a shaft extends between the housings and receives a belt which is coiled upon the shaft when the shaft is rotated in one direction and uncoiled when the shaft is rotated in the other direction. The shaft is movable along its longitudinal axis. It is biased in one direction by a spring, in one of the housings, into a first operating position.