Adjustable electrobed

Claim 1

An adjustable electrobed comprising: (a) a head supported by a spring-mattress, being adjustable in height and in a horizontal position, comprising two independent elements hinged to a spring-mattress support, on axes longitudinal thereto and being able to adopt an adjustable "V" shaped position by the operation of an electric motor which turns two transverse threaded small-spindles to displace two nuts mounted thereon in opposite directions, said nuts being connected to head elements by means of articulated braces, each one of the independent head elements comprising two superimposed plates, the upper one being able to displace along guiding tracks providing at the lower one; a head support comprising two telescopically mounted tubular elements connected by a coaxially mounted spring and a locking mechanism on one of said elements for locking said support at a maximum desired position; (b) a spring-mattress comprising first and second rigid bodies hinged together at a spring-mattress paracentral area, the first body being nearest the head and having at least one transverse cluster of slots, the spring-mattress being supported upon three pair of legs each having a damping mechanism, two pairs being situated on the second body opposite the head, said third pair being situated at a paracentral area of the first body, an angle between said bodies being made by small-spindles arranged transversely to the spring mattress and as a junction between an upper portion of the pairs of legs being nearest the head and the central pairs of legs, said small-spindles being operated by corresponding independent electric motors which displace pairs of nuts towards or away from each other said nuts being joined by braces to fixed points on the spring-mattress, each brace having two degrees of freedom, the upper end of the legs most opposite the head being pivotally anchored to the spring-mattress; and limit switches for stopping said motors at maximum and minimum displacement positions of the head end of the spring-mattress; (c) a platform whereon said legs are fixed and supported; (d) a pneumatic mattress, superimposed on the spring-mattress and provided with a cluster of slots corresponding to that of the latter, said cluster of slots being able to be plugged by a rack closure, said mattress having an elasticity that is adjustable by changing its inflation pressure by means of a manual pump-damper provided at the spring-mattress front body.