Base seat for bed, chair or sofa

A base seat for being used with a bed, a chair, or a sofa, the base seat comprising:

• a fixation base provided thereon with two longitudinal wheel sets arranged in a back-and-forth direction, each of the longitudinal wheel sets comprising two longitudinal support wheels;
• a first rocking frame comprising two longitudinal arc rails extending in the back-and-forth direction and being in contact with top sides of the longitudinal support wheels, and a first upright guide groove;
• on the first rocking frame, two transverse wheel sets are arranged in a left-and-right direction and each comprise two transverse support wheels;
• a second rocking frame comprising two transverse arc rails extending in the left-and-right direction and being in contact with top sides of the transverse support wheels, and a second upright guide groove;
• a first actuator disposed to the fixation base and provided with a first output shaft, a first slider disposed in the first upright guide groove, and a first crank connected between the first output shaft and the first slider, such that the first actuator drives the first rocking frame to reciprocatingly move back and forth relative to the fixation base while changing an angle of the first rocking frame;
• and
• a second actuator disposed to the first rocking frame and provided with a second output shaft, a second slider disposed in the second upright guide groove, and a second crank connected between the second output shaft and the second slider, such that the second actuator drives the second rocking frame to reciprocatingly move left and right relative to the first rocking frame while changing an angle of the second rocking frame.