Extension table

Extension table with an axis of longitudinal symmetry (Y) and comprising:

• a) a fixed frame comprising a pair of legs and a horizontal rectangular structure that supports a main top and is formed of a parallel pair of longitudinal side members connected by a crosspiece;
• b) a mobile frame comprising a pair of legs and a horizontal rectangular structure formed of a parallel pair of longitudinal side members connected by a first crosspiece;
• said mobile frame being telescopically coupled with said fixed frame so that the table can be in two end-of-travel positions, namely a first contracted position that corresponds to a minimum length (L1), and a second extended position that corresponds to a maximum length (L2), as well as in a set of intermediate positions between the two end-of-travel positions that correspond to intermediate length values (L3) comprised between the minimum length (L1) and the maximum length (L2);
• c) an extension top supported by an extension-holding trolley with possibility of revolving around a vertical axis (Z) that intersects said axis of longitudinal symmetry (Y), said extension-holding trolley being slidingly supported by said pair of side members that are coupled with said extension-holding trolley by means of cam-tappet means that impose up-down travels during the forward and backward translations relative to said side-members, in such a way that said extension-holding trolley and the extension top can be disposed at two different parking heights relative to the pair of side members of the mobile frame:
• a first lower parking height, wherein the upper surface of the extension top lies under the lower surface of the main top;
• a second higher parking height, wherein the upper surface of the extension top is coplanar with the upper surface of the main top;
• said second parking height being reached only after pushing said extension-holding trolley to the end-of-travel position away from the fixed frame;
• the extensible table characterized in that it also comprises:
• d) a revolving disk fixed under the extension top and provided with a shaped slot;
• e) a vertical pin that protrudes from a longitudinal rod slidingly supported by said mobile frame and suitable for being coupled with said shaped slot only when said extension-holding trolley slides and reaches its second parking height;
• wherein said vertical pin can slide along a direction that coincides with said longitudinal axis (Y) between two end-of-travel positions, wherein, if coupled with said shaped slot, said vertical pin hinders the rotation of said revolving disk (50), and, if not coupled with said shaped slot, said vertical pin allows the rotation of said revolving disk;
• wherein said vertical pin is always disposed in its first end-of-travel position, hindering the rotation of the revolving disk, when the length of the table is one of said intermediate extension values (L3);
• wherein said vertical pin is automatically moved to its second end-of-travel position, allowing the rotation of the revolving disk, only when the length of the extension table is the maximum value (L2);
• f) automatic means for moving the vertical pin mounted on said mobile frame and suitable for moving said vertical pin to said second end-of-travel position, allowing the rotation of the revolving disk only when the length of the extension table is the maximum length (L2).