Horizontally supported planar surfaces – Vertically adjustable – Shelf type
Patent
1993-05-10
1998-10-20
Chen, Jose V.
Horizontally supported planar surfaces
Vertically adjustable
Shelf type
108145, A47B 900
Patent
active
058231200
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a vertically adjustable desktop, preferably a school desk, which can be adjusted into a required vertical position by a simple manipulation and by a small adjusting force, but which for the most part cannot be unintentionally or impermissibly adjusted.
2. The Prior Art
As early as 1887 an adjustable desk was patented --see SE-A-937. The desktop and bench thereof are vertically adjustable irrespective of; the size and age of the user. This is also the case in SE-A-90.219 disclosing a desk which is vertically adjustable by a complex gabel mechanism. Also SE-A-110.686 discloses a combination of a seat and a desk wherein a complicated handling is involved in adjusting the bench and the desktop. SE-A-20.872, SE-A-117.294 and SE-A-184.113 all disclose more or less complex mechanisms and devices to adjust the combination desk/seat.
SE-B-8107530-1 discloses a balancing device on a table, preferably a drawing table, where the object is to eliminate the difficulties in adjusting the table to equilibrate the load on the table, which load can be about 15-60 kp.
The working position forced onto youngsters during school work in an ordinary desk is often of a kind that,--by the unconscious ability of the body to try to compensate for distorted afflictions, forms the basis defective working positions in later life. Thus, it is of an extreme importance that young people as long as possible are able to change their working positions, i.e., during the year at school, and preferably to make a simple variation of the working position or the physical position possible without necessarily stopping actual work, and if so is the case just for a few seconds.
The object according to the present invention is to obtain a desk, preferably a desk for use at school, wherein a vertical adjustment can be performed infinitely with a simple manipulation and with a small adjusing force, whereby the risk for unintended or not permitted adjustment, e.g., when a person is sitting upon the desk, is eliminated.
SUMMARY OF THE INVENITON
This object is achieved by a desk having the characterizing clauses stated in the claims.
By making the underbody including a parallel linkage to which the one end of a gas spring means is articulately connected to form a lever to the articulated connection point in the underbody of the desk, the gas spring means will carry the weight of the desk (accumulating the potential energy of the desktop) during all vertical adjustment positions of the desk, wherein the rod piston of the gas spring means will remain locked unless a valve means in the gas spring means is actuated in connection to the adjustment, which takes place by adjusting handles in close connection to the desktop. Preferably two adjusting handles are arranged in connection to each of the gas spring means at the underbody of the desk and at the parallel linkage, i.e., two hands have to be used to adjust the vertical position of the desk. This is according to the present invention obtained without that the mechanism at the desk allowing this to happen in itself is voluminous or is intruding on the space for the legs under the desk.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in connection to one embodiment shown in the appended drawings, wherein
FIG. 1 is a schematic side view--of a desk according to the inveniton in a lowered working position,
FIG. 2 illustrates the desk according to FIG. 1 in a middle position, and
FIG. 3 illustrates a desk according to FIG. 1 in the highest position, wherein the desktop is shown in a first folded position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1 the desk is shown with a desktop 1, a lower stationary stand 2, a linkage 3 (of which just one half is shown in the figures), attachment points 4 and 5 at the stand 2 and at the underbody 6 of the desk, respectively. Preferably the desk has a square desktop 1. Preferably the stationary stand 2 has a cross bar (not shown) a distance up on i
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patent: 2982050 (1961-05-01), May
patent: 3080835 (1963-03-01), Guglielmi
patent: 3698327 (1972-10-01), Litvinoff et al.
patent: 3703147 (1972-11-01), Selander
patent: 4383486 (1983-05-01), Reineman et al.
patent: 4577821 (1986-03-01), Edmo et al.
patent: 4898103 (1990-02-01), Pontoppidan et al.
patent: 5005492 (1991-04-01), Ogino et al.
Chen José V.
JELTEC Ergonomiteknik AB
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