Table constructions

A table construction comprising:

• a base frame (1);
• a first table top (4) hingedly connected at one end thereof to the base frame and pivotable at a first pivot center (5) between various inclined positions at a plurality of angles relative to said base frame so as to enable a sitting person to perform work on said first table top;
• a second table top (7);
• said first table top further being hingedly connected at the opposite end thereof to the second table top, as part of a parallel arm system having a link (10) parallel to said first table top, such that said link is swingable from an initial substantially horizontal position to a substantially vertical position when said first table top is swung up substantially 90.degree. from the base frame (1) while said second table top is in a substantially horizontal position irrespective of the angle of said first table top;
• a catch arm (13) having a catch element (15);
• a catch plate (21a, 21b) having an upper surface, said catch plate connected to said base frame at a distance from a second pivot center (11) of said link and remote from the first pivot center (5) of said first table top;
• said catch plate having in said upper surface at least one recess (22) in which said catch element is enterable;
• said link (10) having the catch arm pivotably attached thereto with said catch element provided to cooperate with the upper surface of the catch plate connected to said base surface of the catch plate so as to prevent the link from swinging down at least from said substantially vertical position towards said initial position;
• wherein when said link is at an angle slightly exceeding 90.degree., said catch element passes one end of the catch plate, falls down below the catch plate, and passes under said one recess and beyond the opposite end thereof, such that said catch element is brought up to cooperate with the upper surface of said catch plate when said link is swung down toward said initial position;
• a manually releasable locking device (35-39) connected to the base frame and located between the first pivot center of said first table top and the second pivot center of said link;
• said link (10) further having pivoted thereto a support arm (16);
• said support arm preventing the link from being swung up more than 90.degree. by means of said locking device when said locking device is in a locking position, but in an unlocking position thereof permits such movement;
• a spring element (28) acting upon said link when the latter approaches and passes an angle of substantially 90.degree. from said initial horizontal position to urge said link into a position in which said locking device is lockable in said link;
• and an extension on said first table top;
• said extension being perpendicular to the first pivot center thereof, such that when said first table top is in said vertical position, the second table top is located at a height suitable for work upon said second table top by a standing person.