Abstract: The invention relates to a method of controlling two or more commutator DC motors with permanent magnets in driving mechanisms for setting a position of furniture parts such as tables, beds, chairs etc., where particular driving mechanisms must maintain mutually defined speed independently on their different load. The invention consists in that during functioning of the motors is periodically disconnected power supply of the motors, while in the time of disconnecting the supply is detected the voltage of each motor, which is adjusted using calibration constant characteristic for each motor and the direction of rotation and according to the differences of such adjusted voltages of particular motors is adjusted the operating mode of each motor, by means of which is reached an effective regulation of particular motor run to mutually defined speed independently on their load.

Abstract: An undercarriage for a hospital bed including at least three wheels (1) while at least two wheels (1) are equipped with a brake (2) with a common control (9) of all the brakes (2). The undercarriage further includes a bed movement sensor (31) that is connected to the central processor unit (32), which is interconnected with an actuating device (33) for control of all the brakes (2). The central processor unit (32) is further equipped with a block (35) for generation of a timeout between stopping of turning of the wheel (1) and automatic applying of the brakes (2).