Pneumatic traction device with electrically controlled compressor and relief valve

DETAILED DESCRIPTION I claim: 1.
A portable pneumatic traction device comprising: a pneumatic cylinder enclosing a pneumatic piston; a shaft having one end connected to the pneumatic piston; a carriage traction device connected to the shaft at the other end thereof; a surface mounting device for mounting an end of the pneumatic cylinder to a surface; a controllable air compressor for supplying compressed air to a pressure chamber formed within the pneumatic cylinder on a side of the pneumatic piston; a one-way valve connected between the air compressor and the pressure chamber for preventing airflow in the direction from the pressure chamber to the air compressor but allowing airflow from the air compressor to the pressure chamber; a controllable relief valve connected to the pressure chamber within the pneumatic cylinder for releasing air from the chamber upon opening the relief valve; electrical control means connected to both the controllable air compressor and the controllable relief valve whereupon when the air compressor is actuated, the pneumatic traction device applies a traction force to the carriage traction device and when the relief valve is opened, the traction force applied to the carriage traction device is relaxed.
2.
A traction device according to claim 1 wherein the control means comprises a manual switch.
3.
A traction device according to claim 1 wherein the control means comprises a switch which in turn is controlled by a timing device so that the air compressor can be turned on for a predetermined amount of time and then turned off for a predetermined amount of time.
4.
A traction device according to claim 1 further including a pressure line connecting the air compressor and the pressure chamber; a one-way valve means positioned in the pressure line for maintaining air in the pressure chamber when the controllable air compressor is off and the controllable relief valve is closed.




Description:
BACKGROUND OF THE INVENTION The present invention relates to a pneumatic traction device for applying traction to a patient