DE397109C - Retractable typewriter table for installation in desks or the like, in which the table or support plate is suspended in the manner of a parallelogram by means of two pairs of levers oscillating in parallel and is supported in the position of use by a foldable support rod - Google Patents

Description

GERMAN EMPIRE

ISSUED

AI OCTOBER 16, 1924

REICH PATENT OFFICE

PATENT LETTERING

- M 397109 CLASS 34 i GROUP 4

( ^L 5779 ^J

Hennann Lorge & Co. in Frankfurt a. M.

Typewriter recessed table for installation in desks or the like, in which the table or Support plate suspended like a paralielogram by means of two pairs of levers swinging in parallel and is supported in the position of use by a foldable support rod.

Patented in the German Empire on April 24, 1923.

The invention relates to one in the side part of a desk or in another Piece of furniture to be built in typewriter submerged table, which is designed so that the Table or support plate in per se known

Way by means of two pairs of levers swinging in parallel in the side part of the desk in Parallelogram is suspended, with the weight of the machine when it is brought up completely or partially

S97109

can be equalized, while the table or support plate in a ready-to-use position through a lever system arranged under the plate is supported like a scissor arm that a swaying or trembling of the machine while working is impossible and such the stability of a freestanding typewriter table is achieved. in the When the table or support plate is pulled out, it is in the usual position Table height.

The scream that has become known so far! > machine lowering devices, as far as with these the table or support plate with the machine on a sloping substructure is brought out of the desk, there is the disadvantage that the so created Typewriter table does not reach the height of a normal typewriter table and therefore the machine is too low to work comfortably; also that high-rise Machines are usually difficult or impossible to sink by means of such devices because of their height can.

On the other hand, in other known devices in which the machine is suspended by means of a parallelogram-like linkage and the table or support plate is locked in the working position on the side walls of the table housing, swaying and trembling of the machine is inevitable, which greatly hinders smooth and safe work. In addition, it would appear questionable that 'a machine of great value '. to entrust a table or support plate that is only attached in a cantilevered manner at the rear end, i.e. not supported.

The same also applies to the well-known typewriter sinking tables of those Type in which the plate is movably suspended on a parallelogram-like rod supported by a fixed or foldable support rod in the position of use is. Here, too, the plate, which is only supported at the rear, is held in a cantilevered manner, so it must in itself must be carried out very strongly in order to be sustainable and granted but no absolutely secure stability for the machine.

The purpose of the invention is to remedy the specified deficiencies. This is achieved by a particularly peculiar support rod, which is made of collapsible spreading! pairs of levers is, the pair of scissors, the plate [thigh-like front and rear support, so that the pulled-out table has the stability of a detached typewriter table. The whole device is designed so that it can be built into the cabinet-like side part of each desk - provided it is sufficiently wide - without having to make any changes to its lock or to the table itself. 6s

The drawing illustrates the invention in one embodiment.

Fig. Ι shows a cross section through the cabinet-like side part of a desk with the built-in new device in the swung position (sagging position),

Fig. 2 shows the same cross-section with the device raised and supported Position of use,

Fig. 3 is the front view of a desk with an open, cabinet-like side part and the new retractable table in the position of use,

Fig. 4 a detail.

The typewriter α rests on the table top b, which is suspended in a known manner by means of two pairs of levers c and d in a parallelogram-like manner in the cabinet-like side part of the desk. The tension spring c, which is attached with its upper end at a suitable point on the table housing and connected to the lower end by means of the angle / with the lever ο , is used in a manner known per se to partially compensate for the weight of the machine when it is brought up and thereby a to enable easy lifting of the machine. The purpose of the angle / is to keep the spring e in strong tension when the machine is raised (Fig. 2), without overstressing the spring in its greatest extent, ie in the lowered position of the machine (Fig. 1). The weight compensation of the machine could also take place in that the pairs of levers c and d are put under pressure by springs which are wound around a connecting rod ν located between the upper pivot points of the pairs of levers c and d or both, with the springs at one end are attached to the table, while their other end under the lever c or. · / grasps, so that the tension of the spring is effective on this. In Fig. 4 this type of spring arrangement for weight compensation is illustrated. An auxiliary bracket g is attached under each support plate b; at the free end of its vertical leg the obliquely downward and rearwardly directed struts k of the support rod are articulated. Without the auxiliary angle g it would not be possible to support the table or support plate b sufficiently high, since the struts h would be too long to find space in the table housing when the machine is sunk too short to cover the table

or to bring the support plate to the required height.

The struts h are connected to one another at their rear ends by an axis i (Fig. 3) and are guided into a pair of U-rails I by means of two rollers k. It is now essential that a further pair of support levers m is articulated to act as an expanding lever approximately in the middle of the struts h. These spreading levers are expediently brought under the action of suitable springs η and also connected at their free ends by a transverse rod m ^1. If the table or support plate is raised with the machine, the foot ends of the struts h slide along with the rollers k in the U-rails I , while at the same time the pair of spreading levers m under the action of the springs η ■ with its cross-connecting ^{rod m 1} on one below the support plate b attached slideway 0 slides along. As soon as the rollers k of the struts h have reached the front end of the U-rails I , they are automatically locked by lifting pawls p and prevented from returning. In contrast, the pair of spreading levers m is locked by hand in its Erfdstellung by a reversible locking bolt q, the drive rod of which runs under the table or support plate b and is designed as a handle r at the front.

If the machine is to be lowered, first the pair of spreading levers m is unlocked by a small twisting movement of the handle r and the pawls p are raised by means of a device provided on the side wall of the table housing (Fig. 3) so that the rollers k of the struts h are free . Then, depending on the tension of the balancing springs, the machine lowers itself or with light pressure back into the table housing.

Claims (5)

Patent Claims: i. Retractable typewriter table for installation in desks or the like, in which the table or support plate is suspended in a parallelogram-like manner by means of two pairs of levers oscillating in parallel and is supported in the position of use by a foldable support rod, characterized in that the support rod consists of expansion lever pairs (Ji, tri) , which support the table or support plate like a scissor arm front and rear. 2. Typewriter lowering table according to claim 1, characterized in that the inclined downwardly and backwardly directed main struts (Ji) of the support rod are hinged under the front part of the table or support plate and with their foot ends in fixed guide rails (I) are guided, while the Spreizhefcel (m) , which support the rear part of the table or support plate and are hinged to the main struts (h), slide loosely along the underside of the plate with their free ends. 3. Typewriter sunk table according to claim 1 and 2, characterized in that the struts (h) of the support rods are hinged to the vertical legs of two diapers (g) fastened under the front part of the table or support plate, the vertical leg length of which is dimensioned so that with the strut length given by the depth of the table, the table or support plate is brought to the usual working height. 4. submerged typewriter table according to claim 1 to 3, characterized in that the rear ends of the struts - (Ji) are connected by an axis (i) which by means of two rollers (k) in two mutually open U-rails (t) forcibly guided is, and that the rollers (Ji) shortly before the end of the pull-out movement under locking wedges (p) built into their guide rails (Z) - lifting them - slide so that they are blocked from returning. 5. Typewriter lowering table according to claim 1 to 4, characterized in that the spreader lever pair (m ) hinged to the struts (A) under the action of springs (n) when lifting and lowering the machine on a slideway attached under the table or support plate (b) (0) slides along and is held in the hotly raised machine by means of a reversible locking bolt (q) in the position of use of the same. 1 sheet of drawings.