DE1611809A1 - Compensating device for a drawing table - Google Patents

Description

Andre Bruneau, 5, rue du Palais de Justice, Besancon / France.

"Compensating device for a drawing table"

The invention "relates to an alignment device for Height-adjustable drawing tables.

It is known that much of the modern drafting tables Can be adjusted vertically so that the user can adjust their height independently of the other for drafting tables is able to change the usual setting options.

The one consisting of the table and its adjustment devices Device has a relatively large weight on, which is therefore compensated for after unlocking must be so that the user has the desired height can easily choose.

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Han tried to solve this problem by using to be loosened by balancing springs attached between the part to be adjusted and a fixed rope, but found that the mass balance achieved through this is by no means sufficient, especially due to the lack of stability i ^ real.

In order to remedy this drawback, the invention is directed on a compensation device with two strands of rope or the like., One of which is the rope to be adjusted, the other is attached to a tension spring. Both strands wind up on two hats that rotate together, where the on each rope strand by the radius of the groove - .. against the winding point acting forces at least for the largest part of the setting heights of the to be adjusted Partly stay the same.

So you have a compensation device that has a brings about complete compensation of the weight of the part to be adjusted, which is exactly as a force on one of the two strands of rope.

Advantageously, the two hats are one after the other the other embedded in a freely rotating disc, and the two strands form a single rope. You get such a balancing device, which consists only of a pulley j a rope and a spring and consequently both

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very easy to create as well as at a low price is.

One of the grooves can then be of constant radius and from Rope to be wound several times while the other! Does Is shaped like a helix or spiral. This particularly simple arrangement ensures an effective Drive the disc without sliding and avoids any disturbance in the operation of the device. .

Under the term radius of the groove, the distance is the Groove from its axis of rotation to the point under consideration to understand and not the radius of curvature of the groove at the point in question.

According to a further feature of the invention, the helical groove has a reduced radius in a small area near the point of contact with the constantly running groove, while its increased radius lies in a small area near its inner end.

Both of these features serve the purpose of cushioning the end of the adjustment process when the user the lisch shifts into its upper or its deep hage.

In the first case the local downsizing decreases the radius of the groove the effect of the compensating spring and

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brings βο the force of gravity Jizur effect, which the upward movement of the table is slowed down.

In contrast, the local one increases in the second case Enlargement of the radius of the groove the effect of the compensation spring, which thus becomes effective and the sinking of the table slowed down.

Finally the table can be held open in both directions, so that bumps and damage are avoided and in particular the user reaching the end position is shown. -.

Further features, details and advantages of the invention emerge from the following description of a preferred exemplary embodiment as well as based on the drawing. Here show schematicallyί

Fig. 1 is an elevation of a drawing table according to the invention, parts in the upper end position and partly in the lower end position;

Fig. 2 is a side elevation of the same table Fig. 5 is a plan view of the disk;

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Fig. 4 is a section of the same disc on an enlarged scale and

Pig. 5 shows a corresponding side view.

From Fig. 1 and 2 it can be seen that the illustrated Drawing table as a whole made up of a vertical housing 1 consists, which rests on a pedestal 2 and contains the balancing device. Stick out of this box at least two struts or the like. 3 and 4 show which ones each by four sitting freely on their axes 6 Role-guided are. '

The struts 3 and 4 are provided with sleeves 7 which are connected by a horizontal axis 8, the outer ends of which have brackets 9 which support the plate 0 ^ O »The angle of the plate 10 can be changed by rotating the axis 8, the Locking devices are not shown.

The balance of the table according to the invention is ensured by two symmetrical devices, their corresponding Ropes bear the same reference numerals and of which only one is described.

Such a gate direction consists essentially of a rope, cable or the like 11, which “on the one hand to an on

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FuS of the strut 3 located bolt 12 and on the other hand at the end 13 of a tension spring 14- is attached to a Face 15 is attached, which by a SciFauhe 16 with a fixed cross member 17 is connected.

The rope 11 is freely rotatable on an axis stored disc 18 rolled up, the structure of which in detail from the Pig. 3, 4 and 5.

From these figures. It can be seen that there is a hat 19 of constant radius in the disc 18, to which one Helical groove 20 with a radius that narrows from the connection point A to the end point B adjoins it. In Fig. 3, two parts of a theoretical course of the groove 20 are shown in dashed lines, which in practice receive no attention. In fact, the courage has 20 between the points A and G a reduced radius with respect to its theoretical radius, which moreover leads to the The consequence is that it reaches the groove 19 at point A instead of at the theoretical point D.

On the other hand, the radius between the Points E and F increase and then gradually decrease again to an area with a larger radius than it would be theoretically necessary.

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4 and 5 show the groove 19 between the side walls 22 and 23. This hat 19 can be seen to be of sufficient width to place the rope next to one another several times to wind up. In addition, the groove 19 increases in size, like the lower part of the Pig. 4 shows in order to be able to connect to the groove 20 at point A, which itself only has enough space for one cable turn.

Otherwise, the disc is of the usual type because it consists of a bush 24, which enables a rotary movement through the bore, and of the disc 26, which adjoins the outer rim, taking into account a reduction in weight.

The operation of the device is described below: In every possible position of the elements 3, 7,8, 9 and 10 existing movable part becomes its Weight balanced by the action of the spring 14, since that acting on the disc through the moving part Moment is constant. Likewise, the pair of forces acts in the opposite sense through the spring 14, because the enlargement the force acting on the rope to the same extent causes the extension of the tongue is compensated for by reducing the radius of the groove 20.

For example, if the table is moved upwards,

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the spring type becomes more under the influence of the area A - C reduced than theoretically necessary. The user feels the effect of gravity, which inhibits the upward movement and indicates the approach to the anchorage point.

If, on the other hand, the movable part is shifted downwards, then the spring work between points F and E is increased and the same effect is achieved for the user.

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Claims (4)

Claims a Compensating device for height-adjustable Zeiohen- . ■ ■ ■ - ■ "■ '-' ■, ' , tables, characterized in that they have two rope or cable strands (11), one of which on the movable part (3, 7, 8, 9, 10), the other is attached to a tension spring (14), and which are rolled up on two jointly rotatably connected hats (19, 20), the forces acting on each strand through the radius of the corresponding groove opposite the roll-up point of the cable, at least for the majority of the positions of the moving part are the same. 2. Compensating device according to claim 1, characterized in that the two hats (19, 20) are free on one rotatably mounted disc (18) are arranged contiguously and the two strands are a single one Form rope (11). 3. Compensating device according to claim 1 or 2, characterized characterized in that one of the two hats (19) has one has a constant radius to which the rope (11) is wound several times, while the other hat (20) is trained in the form of a Sohneoke. - 10 - 009883/0101 BAD OfflfilNAfc 4. Compensating device according to one of the claims 1 to 3t characterized in that the helical hat (20) in a small area (A-C) close the point of contact with the radius constant groove (19) a reduced Raxus and in a small one Area (E-P) near its near-axis end (B) has an enlarged radius. 009883/0101. ^{8AD 0} ^ NAL Blank page