Wheel projection mechanism and storage bed base provided with same

The present invention relates to a wheel projection mechanism which comprises a first part (1) comprising a support surface (1.1) and a coupling surface (1.2), a second part (2) coupled with the coupling surface (1.2) of the first part (1), such that the second part (2) can rotate around itself about a first axis of revolution (7) perpendicular to the coupling surface (1.2), the second part (2) defining a second axis of revolution (8) which is coplanar and forms an angle of between 110° and 160° with the first axis of revolution (7), and comprising means for articulating a castor wheel according to the second axis of revolution (8).