DE1611809B2

DE1611809B2 - WEIGHT COMPENSATION DEVICE FOR A HEIGHT-ADJUSTABLE DRAWING TABLE

Info

Publication number: DE1611809B2
Application number: DE19681611809
Authority: DE
Inventors: Der Anmelder Ist
Original assignee: Individual
Current assignee: Individual
Priority date: 1967-03-17
Filing date: 1968-03-14
Publication date: 1973-08-09
Also published as: BE711799A; LU55635A1; DE1611809C3; DE1611809A1; FR1523297A; NL6803842A; NL152161B

Description

Scheibe 18 eine Nut 19 von konstantem Radius befindet, an die eine schneckenförmige Nut 20 mit einem sich vom Verbindungspunkt A zum Endpunkt B vermindernden Radius anschließt. In F i g. 3 sind zwei Teile eines theoretischen Verlaufes der Nut 20 gestrichelt eingezeichnet, die in der Praxis keinerlei Beachtung finden. Tatsächlich hat die Nut 20 zwischen den Punkten ΛΙ und C einen bezüglich ihres theoretischen Radius verkleinerten Radius, was überdies zur Folge hat, daß sie statt am theoretischen Punkt D am Punkt A die Nut 19 erreicht.Disk 18 is a groove 19 of constant radius, to which a helical groove 20 with a decreasing radius from the connection point A to the end point B is connected. In Fig. 3, two parts of a theoretical course of the groove 20 are drawn in dashed lines, which are not taken into account in practice. In fact, the groove 20 between the points ΛΙ and C has a reduced radius with respect to its theoretical radius, which moreover has the consequence that it reaches the groove 19 at point A instead of at the theoretical point D.

Andererseits vergrößert sich der Radius zwischen den Punkten £ und F zunehmend und verkleinert sich dann fortlaufend wieder, um einen Bereich mit einem größeren Radius zu bilden, als es theoretisch notwendig wäre.On the other hand, the radius between the points E and F increases increasingly and then decreases again continuously in order to form an area with a larger radius than would be theoretically necessary.

Die F i g. 4 und 5 zeigen die Nut 19 zwischen den Seitenwänden 22 und 23. Diese Nut 19 ist ersichtlich von ausreichender Breite, um das Seil 11 mehrfach nebeneinander aufzuwickeln. Überdies verbreitert sich die Nut 19 zunehmend, wie es der untere Teil der F i g. 4 erkennen läßt, um sich im Punkt A an die Nut 20 anschließen zu können, welche selbst nur für eine Seilwindung genügend Platz aufweist. asThe F i g. 4 and 5 show the groove 19 between the side walls 22 and 23. This groove 19 can be seen to be of sufficient width to wind the rope 11 several times next to one another. In addition, the groove 19 widens increasingly, as is the case in the lower part of FIG. 4 can be seen in order to be able to connect at point A to the groove 20, which itself only has enough space for one cable winding. as

Ansonsten ist die Scheibe 18 von der üblichen Art, denn sie besteht aus einer Buchse 24, welche durch die Bohrung 25 eine Drehbewegung ermöglicht, und aus der Scheibe 26, die unter Beachtung einer Gewichtserleichterung an den Außenkranz anschließt.Otherwise, the disc 18 is of the usual type, because it consists of a bush 24 which through the bore 25 allows a rotary movement, and from the disc 26, while observing a weight reduction connects to the outer rim.

Diese Gewichts-Ausgleichsvorrichtung arbeitet wie folgt: In jeder möglichen Lage des aus den Elementen 3,7, 8,9 und 10 bestehenden beweglichen Teils wird dessen Gewicht durch die Wirkung der Feder 14 ausgeglichen, da das durch den beweglichen Teil auf die Scheibe 18 wirkende Moment konstant ist. Ebenso wirkt das Kräftepaar im umgekehrten Sinne durch die Feder 14, denn die Vergrößerung der auf das Seil 11 wirkenden Kraft, die im gleichen Maß die Verlängerung der Feder 14 bewirkt, wird durch die Verkleinerung des Radius der Nut 20 kompensiert.This weight balancing device works as follows: In every possible position of the elements 3,7, 8,9 and 10 existing moving part is weight by the action of the spring 14 balanced, since the moment acting on the disk 18 through the movable part is constant. Likewise, the couple acts in the opposite sense through the spring 14, because the enlargement of the the rope 11 acting force, which causes the extension of the spring 14 to the same extent, is through the Reduction of the radius of the groove 20 compensated.

Wird beispielsweise der Zeichentisch nach oben verschoben, so wird durch den verminderten Radius im Bereich A-C die Federarbeit mehr als zum reinen Gewichtsausgleich erforderlich vermindert. So empfindet der Benutzer die Wirkung der Schwerkraft, welche die Aufwärtsbewegung hemmt und die Annäherung an den Anschlagpunkt anzeigt.If, for example, the drawing table is moved upwards, the spring work is reduced by the reduced radius in the area AC more than is necessary for pure weight compensation. The user feels the effect of gravity, which inhibits the upward movement and indicates the approach to the anchorage point.

Wird dagegen der bewegliche Teil nach unten verschoben, wird die Federarbeit wegen des vergrößerten Radius zwischen den Punkten F und ZJ verstärkt und für den Benutzer die nämliche Wirkung erzielt.On the other hand, if the moving part is shifted downward, the spring work is increased because of the Increased radius between points F and ZJ and achieved the same effect for the user.

Hierzu 1 Blatt Zeichnungen 1 sheet of drawings

Claims

1 21 2

Compensation device of the type mentioned at the beginning

Claim: provided according to the invention that the two

Grooves are formed and merge into one another

Weight compensation device for one higher, the two rope strands form a single continuous, height-adjustable drawing table with two rope strands 5 rope, which several times the radius constant, one of which wraps around the movable weight groove, and that the helical groove is to be compensated, the other on a ge - Fixed tension spring is attached in a small area of its maximum radius and the rope near the point of contact with the constant radius strands on a groove with constant radius groove a reduced radius and in a small and a helical groove with changing- io area of its minimum Winding up or unwinding the radius close to its axial radius, and the grooves hen end B has an enlarged radius,
On a freely rotatably mounted disc, which are arranged side by side due to the merging of the two grooves, the possibility given by the two rope strands characterizes that the two grooves (19, as a continuous rope, so that the to-20) into one another are designed transitioning and 15 long the necessary fastening of the ends of two strands of the two ropes a single continuous, separate ropes is omitted, already means to form a beSeil (11), which wraps around the radial structural simplification of the constant groove (19) several times, and that the previously known arrangements,
The main advantage of the inventive rich (AC) of its maximum radius close to the 20 weight compensation device lies in the special point of contact with the constant-radius groove formation of the helical groove, through which (19) a reduced radius and in one is achieved that a damping of the Verstellvorkleinen area (EF) of their minimum radius gear when approaching the drawing table to its near its near-axis end (B) takes place an enlarged upper or lower end position, so that the th radius. 25 drawing table, if it is swinging downwards or '

is hit at the top, does not hit its end stops abruptly, but gradually without intervention

fen special locking elements is braked.

In the following description, an execution

30 approximately example of the invention with reference to the drawing

The invention relates to a weight compensation explained in more detail. It shows schematically
direction for a height-adjustable drawing table F i g. 1 an elevation of a weight compensation system with two strands of rope, one of which is movable, in the direction of a drawing table, partly in the upper part to be balanced in weight, the other in the end position and partly in the lower end position,
a frame-fixed tension spring is attached and the rope 35 Fi g. 2 is a side elevation according to FIG. 1,
strand themselves on a groove with constant radius and F i g. 3 is a plan view of the disc,
a helical groove with a changing rim. 4 a section of the same disc in the verdius winding or unwinding and the grooves on a freely larger scale and
rotatably mounted disc next to each other. 5 a corresponding side view,
are ordered. 40 From Fig. 1 and 2 it can be seen that the Darge-Such a weight balancing device is presented drawing table total of a vertical already from the German utility model housing box 1, which rests on a pedestal 2 1 726 923 and the United States patent 2 168 209 and the Weight balancing device has become unfamiliar, with both known stops. From this box 1 protrude at least two stretches of two separate rope strands 3 and 4, each of which is guided by four rollers 5 which are seated at the end of the groove with their axes 6 constant.
Radius or at the end of the helical groove The struts 3 and 4 are provided with sleeves 7, which must be fastened. This fastening causes considerable difficulties, which are connected by a horizontal axis 8, in particular as a result of which the outer ends have brackets 9 which, since the cable lengths must be coordinated with one another, carry the plate 10. The adjustment angle of the plate 10 can be sen and this coordination can be changed by turning the axis 8, which makes it difficult to fasten the two rope strand ends locking devices are not shown,
will. The table is balanced by two symmetrical In addition, with the above-mentioned known metric weight balancing devices, there is a risk that when pushing 55, the corresponding parts of the drawing table carry the same drawing table upwards or downwards, and from them only a reason for the impulse given to him on the one or is written.

other end stop abruptly abuts, such a weight compensation device bewas the risk of damage to the character stands essentially from a rope 11, which eisches and in particular the adjustment mechanism 60 on the one hand means located at the foot of the strut 3 or 4, borrowed bolt 12 and on the other hand at the end 13 of a The invention is based on the object, a tension spring 14 is attached to a claw 15 befeeinfach built weight balancing device is Stigt, which by a screw 16 with a fefür a height-adjustable drawing table is connected to create a cross member 17.

fen, in which an automatic braking of the 65 The rope 11 is freely rotatable on a

chentical when approaching one of its terminal axis mounted disc 18 rolled up, its structure

hung is given. in detail from FIGS. 3, 4 and 5 can be seen.

To solve this problem is at a weight From these figures it can be seen that in the