Abstract: The system comprises two frame structures (1) and (2) articulated with each other at their sides, the articulations (3) thereof incorporating bearings and connected in a simple manner by pins (14) and end washers (15), such that it incorporates lower supporting means that are stable at one end and rolling at the other end, whereby the elevation and lowering are performed by moving the frame structure (2) with a piston (10) that is driven by a motor (11), such that the piston (10) is articulated at its free end with a cross member (13) of the frame structure (2) and the motor (11) is articulated with the cross member (5?) of the frame structure (1). The frame structures end at the top in supports articulated with brackets in the form of forks (7) on which the bed base to be raised or lowered rests. The profiles used have a quadrangular cross-section, thereby providing a simple structure that is easily assembled and consequently inexpensive, usable with any bed base.

Abstract: A tap for bottles containing a liquid under pressure comprising a tubular element which defines an intermediate chamber from which extends obliquely an outlet duct and which has a lower opening which functions as a valve seat for a sealing connection mounted on the free end of a stem which is mounted axially in such tubular element and which under the load applied by a compression spring is constantly forced upward where there is mounted an operating lever which may be operated from the exterior. A sealing connection in the form of a skirt is mounted inside the spring, between a circumferential groove in the stem and the bottom of the spring.