EP1002918A1 - Safety device for pull-out elements in cabinets - Google Patents

Abstract

The safety device is used in chests of drawers etc. and where one drawer is opened further drawers are prevented from being opened. It also prevents two or more drawers being opened simultaneously. It comprises a column of movable components, of which each is movable between first and second positions so that the total height of the column increases when it is in the second position. Each movable component (3) is arranged in a rail (1), which makes possible its sliding movement in one direction with a vertical component and a limited pivot movement between first and second positions. It has at least one two-sided inclined surface (6-7,9-10) with one end, which works in conjunction with a corresponding device on a drawer (P1,P2).

Description

The present invention relates to a security device for pull-out elements in furniture. In particular it is a piece of furniture for the general Office use that has a solid structure and a certain Number of drawers lying one above the other, which slides on when opening and closing Rails are guided.

One problem with such furniture is that if two or more drawers by one user be opened at the same time, the relocation of the Center of gravity can lead to tilting of the piece of furniture, which is inconvenient for the user and risk of injury connected is. For security reasons, therefore Developed devices (so-called pull-out locks) which should prevent an open drawer, that any other drawer is opened. The too Devices developed for this purpose unfold their Effect only after opening the drawer and have hence the disadvantage that they cannot prevent two or more drawers are opened at the same time, that is, before the safety device works occurs, and that it is nevertheless to the above Trouble may come.

To achieve complete security, it is necessary that a simultaneous opening of two or several drawers is prevented. For this purpose Developed devices that a column of moving Have elements, each between a first and a second position movable and thus obtained and is arranged that the total height of the column increases when the movable element is in the second position. Each movable element works with a cooperating one Device a drawer together, which it in its second position when the drawer is open and returns it to its first position when the drawer is closed. The column in turn works with connections that give her an increase in height allow that just above the height increase due the transition of a single movable element into the second position is. That way, not only that Prevents opening of any other drawer if one Drawer is already open, but also the simultaneous Open two or more drawers.

An advantage of these devices lies in the fact that it is possible through the control of a lock that for the column made of movable elements allowed increased height continue to limit to a value that is under the increase in height due to the transition of a movable element in the second position lies, through which the same safety device a lock of all drawers against one unauthorized opening is achieved.

However, the known devices of the type mentioned have various disadvantages. Some of them can movable element that due to opening a drawer was placed in the second position instead of Closing the open drawer by mistake in to be brought back to his first position. In this case not only lacks the safety effect of the device, but it will also be closing the open drawer prevented if no further measures are taken or the device is damaged. With certain devices the closed drawers are locked at an open drawer with considerable play, that practically cannot be reduced and become one Impression of lack of operational reliability of the Device and in certain cases to a possible Breaking them out leads. The construction of these devices is complex and turns out to be violent or wrong Handling as relatively weak and prone to damage out if you're not on a very expensive one Construction. They also need Devices in certain cases relatively much Space, which means they are not on the side of the drawers or behind the drawers of the furniture can.

In view of this, there is an aim of the present Invention therein, a security device for Pull-out elements for furniture of the specified type to provide, with a beneficial effect opposes any oversight by the one movable element returned to its first position can be opened while a drawer remains open. Further the invention aims to provide a device where it is always possible to open an open drawer close, even if the movable elements of the drawer accidentally returned to its first position without damaging the device. Furthermore, such a device is to be provided which despite the use of very durable materials can be produced inexpensively, being on this Way the requirements for strength and Economy are coordinated. Furthermore, such Device are provided, the attachment of which is simple and is therefore possible at low cost. Also supposed to According to the invention, a device can be provided which, depending on the expediency, both on the side of the Drawers can also be attached to their rear wall can. Furthermore, the device should be designed such that when one drawer is open, the others Drawers with a small size that can be reduced as required Game is blocked against opening.

According to the invention, this is a safety device provides for pull-out elements in furniture, at each movable element is arranged in a rail, which causes it to slide in a direction with a vertical Component and limited pivotal movement between allows a first and second position, and at least has a two-sided sloping surface with one end, that with a collaborative institution of a Drawer can work together when opening the drawer both a sliding movement of the movable element as well its pivoting movement from the first to the second position and when the drawer is closed the return of the to produce the movable element in its first position. Each movable element is on its lower and upper End with counter devices that with corresponding counter devices of the neighboring movable elements can work together so that a Approximation of each element to the neighboring element is enabled when it is in its first position located, and so that such an approach prevents when it is in its second position. At least one elastic device is provided to towards the pillar of the moving elements act that it strives for all moving elements to get closer to each other.

In this way, opening a drawer causes their collaborating institution, based on at least an inclined surface of at least one movable Element works, the mutual distance of two neighboring moving elements and the transition of one of them in its second position so that it is due the effect of the counter device no longer to the other Element can approach while the column is moving Elements has increased in height and no longer could increase. In this way, a subsequent one Prevents another drawer from opening and it is equally impossible to have two or more drawers at the same time to open what by the simultaneous transition of two or more movable elements in the second position would lead to an increase in the height of the column above the permitted height increase. The moving element that has been brought into its second position then usually in a suitable condition to the Effect of the cooperating element of the drawer to take up its inclined surface, which is the movable Element while closing the drawer in its first Position. But even if this flexible Element in the meantime accidentally in its first Its sloping surface would have been positioned the cooperating mechanism of the drawer on everyone Allow case on the corresponding movable element to act by moving it lengthways and the allows the drawer to return to the closed position becomes.

Preferably, both end faces have each movable one Elements two-sided sloping surfaces, and on the column two opposing elements appear from movable elements elastic devices, one over the other prevails. Advantageously, one of the two opposite elastic devices one in one Direction limited effect by a stop.

This way, when you open a drawer, two neighboring moving elements by the collaborative Set up the drawer lengthwise in two opposite Directions shifted, and the prevention of Opening more drawers doesn't just depend on the Impossibility of further increasing the height of the column but also from a shift of all movable Elements whose sloping surfaces are no longer in are in a position to collaborate with Facilities of other drawers to work together. These are therefore in a favorable manner in their closed position held, the game at will depending on The accuracy requirement of the machining can be reduced can.

Each movable element preferably has a plane Base plate on which is curved in a C-shaped rail Edges arranged and guided therein and a has a tapered shape. Thanks to this arrangement will be simple Way both the hold of the moving elements in the Rail as well as the mobility of the moving elements in the longitudinal direction and its limited pivoting possibility in the rail achieved, and the attachment of the column moving elements is greatly simplified by the fact that by simply threading the moveable Elements are made from above into the C-shaped rail they just slide down by gravity and themselves stack.

Each movable element advantageously has parts that stand out from the flat base plate, which the two-sided sloping surfaces and the counter devices form that with the corresponding counter devices of the neighboring elements work together.

Figur 1

eine Vorderansicht einer Schiene mit drei beweglichen Elementen gemäß einer ersten Ausführungsform der Erfindung für ein Möbelstück mit zwei Schubladen, wobei beide Schubladen geschlossen sind;

Figur 2

die Teile gemäß Figur 1, wobei aber eine Schublade im Begriff ist, geöffnet zu werden;

Figur 3

die Teile gemäß Figur 1 und 2, wobei eine Schublade bereits teilweise geöffnet worden ist;

Figur 4

eine Vorderansicht eines beweglichen Elements gemäß der ersten Ausführungsform der Erfindung in Einzelteildarstellung;

Figur 5

das in Figur 4 dargestellte bewegliche Element in einem Längsschnitt entlang der Linie V - V in Figur 4;

Figur 6

eine perspektivische Ansicht der Schiene und der beweglichen Elemente gemäß Figur 1;

Figur 7

den Querschnitt der Schiene, welche die beweglichen Elemente gemäß den vorhergehenden Figuren hält;

Figur 8

eine perspektivische Ansicht eines Paares von beweglichen Elementen einer zweiten Ausführungsform nach der Erfindung, und

Figur 9

eine schematische Ansicht zur Verdeutlichung eines Schließmechanismus an einer erfindungsgemäßen Sicherheitsvorrichtung.

Further details, features and advantages will become apparent from the following description of preferred embodiments with reference to the accompanying drawings. It shows:

Figure 1

a front view of a rail with three movable elements according to a first embodiment of the invention for a piece of furniture with two drawers, both drawers are closed;

Figure 2

the parts of Figure 1, but a drawer is about to be opened;

Figure 3

the parts of Figures 1 and 2, wherein a drawer has already been partially opened;

Figure 4

a front view of a movable member according to the first embodiment of the invention in individual parts;

Figure 5

the movable element shown in Figure 4 in a longitudinal section along the line V - V in Figure 4;

Figure 6

a perspective view of the rail and the movable elements according to Figure 1;

Figure 7

the cross section of the rail which holds the movable elements according to the previous figures;

Figure 8

a perspective view of a pair of movable elements of a second embodiment according to the invention, and

Figure 9

is a schematic view showing a locking mechanism on a security device according to the invention.

The general structure and operation of the invention Device will be described with reference to the Figures 1-7 explained, referring to a first Relate embodiment.

The reference numeral 1 denotes the base plate Rail in the form of a straight bar with a C-shaped Cross section (Figure 7) with curved edges 2, which on Structure of a piece of furniture on the side of the drawers (on one or both sides) or behind, the base plate 1 in any case parallel to The drawer is sliding and moving with it extends larger vertical dimension or at least has a vertical main component. On the other There is one side of each drawer (not shown) cooperating facility attached, for example in Shape of a pin, which is arranged so that when Slide the drawer the curved edges 2 of the rail 1-2 touched. In Figures 1 to 3, where the presence of two Providing drawers are two of these cooperating facilities in the form of cones P1 and P2 shown.

Between the base plate 1 and the curved edges 2 of the Rail 1-2 are arranged movable elements 3 that 4 and 5 are designed. In Figures 1 to 3 and 8 are three of these movable elements with 3.1, 3.2 and 3.3 shown, which is threaded into the rail 1-2 from above and can be stacked in it, the neighboring ones moving elements touch each other.

oben und unten , oberer und unterer auf die als Beispiel dienende Anordnung beziehen, aber daß sich die Funktionsweise der Gesamtheit nicht ändern würde, wenn alle beweglichen Elemente umgekehrt zu der als Beispiel dienenden Position angebracht wären.Each movable element has a base plate 3, which has a tapered shape from top to bottom (sides 3 'or 3'') and whose maximum width corresponds to the clear width of the rail 1-2, so that each movable element is held by the rail is and can slide lengthwise in it, while the base plate 3 thanks to its taper can also be pivoted to a limited extent inside the rail 1-2 by being supported on the ends of the upper part with the maximum width of the base plate 3. However, care must be taken to ensure that the information is present throughout the description of the movable elements 3

above and below , upper and lower refer to the example arrangement, but that the operation of the whole would not change if all the moving elements were reversed from the example position.

At the upper end, the base plate 3 has an extension 4 on whose level is shifted to it from the baseplate 1 to keep the rail 1-2 at a distance, and out of the Elevations 5 protrude, which represent the counter devices and facing the plane of the plate 3, and one bilateral sloping surface 6-7 facing in the opposite direction points. At the lower end, the base plate 3 sits a stepped part 8, which with another bilateral sloping surface 9-10 ends and points under Reference to the plane of the plate 3, an extension 11 on, whose end counter devices with larger ones Has depressions 12 and smaller depressions 13. More specifically, the larger recesses 12 are relative the elevations 5 in the direction of the side 3 'of the base plate 3 aligned, while the smaller recesses 13 with respect to the elevations 5 in the direction of the side 3 '' of the Base plate 3 are aligned.

The height of each movable element that is between the Projections of the vertices of the bilateral sloping surfaces 6-7 and 9-10 is measured on the longitudinal axis of the element, must be the distance between the collaborating institution a drawer (for example P2) and the cooperating one Set up the drawer underneath (for Example P1) correspond; for the sake of standardizing the In production this distance generally corresponds to that Height of the drawers.

As can be understood, the described movable Element simple and inexpensive both through injection molding of plastic as well as preferably by pressing Metal sheet are made, the latter Case high strength and low production costs given are.

As already said, the rail 1-2 arranged movable elements 3 to a limited extent perform a pivoting movement by moving into a Bring the first position (in Figures 1 and 2 for the movable elements 3.1, 3.2 and 3.3 and in Figure 3 for the movable elements 3.1 and 3.3 shown), in which the side 3 'of the plate 3 on a curved edge of the Rail 1-2 rests, or in a second position (in Figure 3 shown for the movable element 3.2), at the side 3 '' of the plate 3 on a curved edge of the Rail 1-2 rests.

Therefore, the larger depressions are in the first position 12 of a movable element with respect to the elevations 5 of the movable element and therefore regarding the elevations 5 of the adjacent movable element aligned, while in the second position the smaller depressions 13 of a movable element with respect to the elevations 5 of the movable element and therefore also with respect to the Elevations 5 of the adjacent movable element are aligned.

If there is a moving element like 3.3 in the first Position, it can therefore be located below moving element like 3.2 approximate until its bilateral sloping surface 9-10 with the two-sided sloping Area 6-7 of the underlying movable element in Touch occurs because the elevations 5 of the underlying movable element 3.2 in the larger recesses 12th of the relevant movable element 3.3 penetrate can.

If, on the other hand, there is a movable element such as 3.2 in FIG in the second position, it may be due to the Do not approach the underlying moving element as 3.1 and its bilateral sloping surface 9-10 remains from the bilateral sloping surface 6-7 of the underlying movable element removed because the elevations 5 of the underlying movable element 3.1 only in the smaller depressions 13 of the element in question 3.2 can penetrate. It is clear that the amount of Column of the elements 3 stacked in the rail increases.

The movable element 3.1, which is at the lower end of the Column is located on an elastic element with limited mobility, like a spring 14 which exerts a direct force upwards, but its mobility is limited upwards by a stop 15. Moreover is the longitudinal mobility of the lower one Elements 3.1 by a fixed stop 16 on cheap Way limited.

The movable element 3.3, which is located at the top of the Pillar located, experiences through an elastic element, such as a spring 17, a downward load, and its agility is limited by a stop 18. The total game, which is the sum of the game between the stop 15 and the lower movable element 3.1 of the Pillar and the game between the stop 18 and the top Element 3.3 of the column gives the maximum allowable Height increase of the column of the moving elements.

The elastic device 14 is in its 15th limited position so that the apex of the bilateral sloping surface 6-7 of the lower movable Elements 3.1 of the pillar approximate to the collaborative Furnishing P1 of the lower drawer of the piece of furniture is aligned.

The device works as follows.

As long as all drawers are closed, the result is State according to Figure 1. As already said, the spring lies 14 on the stop 15, and the spring 17 holds all moving elements that are in their first position located and according to their two-sided slopes Surfaces lie on top of each other. The collaborators Devices P1 and P2 of the various drawers are located towards the sloping surfaces 6 and 9 of the various moving elements.

If it is now assumed that that of the cooperating Device P1 corresponding drawer for sliding is brought to be opened, the collaborative intrudes Device P1 between the inclined surface 6 of the movable element 3.1 and the inclined surface 9 of the movable element 3.2 a generated by the intrusion a distance and leads to the state according to Figure 2. Das movable element 3.1 (along with all the others may have been below it) Effect of the spring 14 and at least approximately to Stop 16 moved down and the movable element 3.2 was shared with everyone else who dealt with it are against the action of the spring 17 and at least displaced approximately up to the stop 18.

When opening the drawer with the cooperating Device P1 continues, the latter pulls that movable element 3.2 by friction and brings it in its second position. It can be said that these two processes of moving the moving Elements 3.1 and 3.2 of each other and the transition of movable element 3.2 in its second position also in reverse order with respect to that described or could take place at the same time without this being the on End effect would change in any way.

The spring 14 pushes the element 3.1 back upwards, however this can no longer its two-sided inclined surface 6-7 with the two-sided sloping surface 10-11 of the one above Elements in touch since in the second Position of the movable element 3.2 its smaller Wells 13 to the elevations 5 of the movable Elements 3.1 are aligned so that the difference between these parts the movable elements 3.1 and 3.2 allows only a slight approximation, which the Hooking the elevations 5 into the smaller recesses 13 corresponds.

It is important to note that since the collaborative Device P1 on both movable elements 3.1 and 3.2 acts against the action of the spring by a movable Item opposite to the other position of small height errors in the position of the collaborators Facility is not affected, which both from structural tolerances as well as from the possibility can arise that the user operates the drawer and lifting it up slightly. This gives us the certainty that it is correct even in such cases mutual hooking of the counter devices of the concerned moving elements comes and that the function of the Device is not affected.

Therefore, the co-operating facility P2 and all collaborating institutions above Drawers, if present, are no longer opposite the sloping surfaces of the movable elements 3.2 and 3.3 but opposite an edge, which shows the displacement at Prevents opening in a favorable way. The same process of course it also happens to the collaborators Facilities, if any, below the cooperating facility P1 are located. Therefore, at an open drawer no more drawer be opened. Care should be taken to ensure that this backing the cooperating drawers, that cannot be opened, has a game is that only from the machining accuracy of the parts depends and can therefore be reduced at will.

When trying two or more drawers at the same time would open up all collaborative institutions between the sloping faces that face them penetrate and remove them from each other, but this one The process would be finished as soon as the column increased in height movable elements through the stops 16 and 18th has reached the set limit. It is therefore sufficient that these stops are arranged so that they the column enable the movable elements to increase their height than the one working together when one Establishing, but smaller than that Double of the same is so that a simultaneous opening of two or more drawers is made impossible.

When the opened drawer is closed again, their collaborating institution P1 penetrates between the inclined surfaces 7 of the movable element 3.1 and 10 of the movable element 3.2, removes them from each other and releases the smaller recesses 13 of the movable element 3.2 of the elevations 5 of the movable element 3.1 and pulls the movable element with it by friction puts it back in its first position so that from the in Figure 2 shown state to that shown in Figure 1 Condition is decreased.

As long as the drawer is open, hooking is prevented the smaller recesses 13 of the movable element 3.2, that has moved into his second position with the Elevations 5 of the underlying movable element 3.1 an unwanted return of element 3.2 to its first Position, even if any circumstance on this return could lead. Should this unwanted return nevertheless would take place, the cooperating institution of the open drawer when closing the oblique Hit surfaces 7 and 10 and push them away by pressing the movable elements 3.1 and 3.2 apart, so that the drawer returns to the closed position would take place without encountering any obstacles or to one Damage to the device.

As can be understood, the top and bottom could movable element of the column without one of the counter devices be and therefore have a simplified structure. It However, the counter devices not used can be cheaper maintain to the construction of all moving Normalize elements.

6 shows a variant of the first described so far Embodiment of the movable elements. In in this case the bilateral sloping surface is 9-10 from a recess 19 interrupted. If the collaborative Set up the drawer between the two-sided sloping surfaces of two adjacent movable elements arrives, thanks to this nature instantly stuck in the recess 19. Therefore, she practices favorable way, and not just by friction, a shear force on the moving element from its first Position moved to its second position or vice versa must become. This ensures correct functioning the device even with abnormal resistances that Counteract the displacement of the moving elements. By this nature of the parts that work together Effect, the mutual is also Approach between the relevant moving elements only then possible (both when opening and when Closing the drawer) after moving the position who have correctly hooked their Counter devices allows, so that this hooking on is guaranteed in every case.

Figure 8 represents another embodiment of the movable Elements of the device according to the invention. In this Case, each movable element has only the lower bilateral sloping surface 9-10, while the upper one of a Transverse surface 20 is replaced and the remaining parts of the movable Elements remain essentially unchanged.

The functioning of the device remains essentially same, but in these circumstances the transition causes a cooperating arrangement of a drawer none Movement of the underlying moving elements but only a shift of the moving ones above Elements. Therefore, the stack of moving Elements rest on the bottom of the stop 16, and the spring 14 can be omitted, reducing the construction of the device is simplified. But while the one above the open one Drawer lying drawers on the previously described conveniently kept in the closed position, will only open the drawers underneath the impossibility of further increasing the height of the column of the prevents moving elements, but their backing takes place with a game because they're dealing with a sloping surface connect and move them a little earlier before the lock in relation to the impossibility of increasing height the pillar comes into play above a certain limit.

Figure 8 also shows how the base plate 3 of the Movable elements attached a wide opening 21 can be a simple operation of the screws or other fasteners for attachment the device on the construction of a piece of furniture allowed. This feature that only in the second embodiment was also shown in the first embodiment the device are used.

FIG. 9 finally shows an exploded view, like a locking mechanism for locking all drawers can be attached to prevent unauthorized opening. A carrier 22, whose lower surface forms the stop 18 and one Has seat 25 for the spring 17 is on the structure of the Fixed piece of furniture and has a nose 23 with a curved Seat 24 on. A rotating block made by rotating one Lock (not shown) of any kind is operated, has a cylindrical portion 25 which in curved seat 24 of the carrier 22 rests, and a cam 26, which in the position shown the displacement a rib 28 which is connected to the upper movable element 3 the pillar is firmly connected, if it is rotated 180 °, the shift and therefore the increase in height of the column and thus the opening of everyone Drawer prevented.

In some cases, the lock cannot be fixed Structure of the piece of furniture, but on a small upper one Drawer can be mounted, which with none cooperating institution and therefore by the Function of the device described is excluded.

In these cases, another can be found in rotary block 25-26 Section 27 may be provided, the one rotary bolt which, if the block with respect to the position shown is rotated by 180 °, behind the nose 23 of the carrier 22 is fixed and in this way also locks the upper drawer against unauthorized opening.

It is understood that these arrangements referenced to the second embodiment of the invention have been described, as well as in the described first embodiment can be used.

In Figure 9, the element 30 represents the lower, immovable Element of the column, which, as already indicated, a simplified structure with only one tab 29 May have anchoring to a fixed part, so that Element 30 takes over the function as lower stop 16.

The invention is not limited to that described as examples and illustrated embodiments, but it numerous changes are possible, which the expert in Case of need.

Claims (13)

Safety device for pull-out elements in furniture to prevent the opening of each additional drawer once a drawer has already been opened and the simultaneous opening of two or more drawers, with a column of movable elements, each of which can be moved between a first and a second position and so on is arranged and arranged that the total height of the column increases when it is in the second position, each movable element cooperating with a cooperating element of a drawer which brings it into its second position due to the opening process of the drawer and it due to the closing process the drawer returns to its first position, and the column works with connections that only allow it to increase in height, which is little above the increase in height due to the transition of a single movable element to the second position, characterized in that each movement same element (3) is arranged in a rail (1) which enables it to slide in one direction with a vertical component and a limited pivoting movement between a first and a second position, and at least one bilateral inclined surface (6-7; 9-10) with one end, which can cooperate with a cooperating device of a drawer (P1, P2), so that when the drawer (P1, P2) is opened, both a sliding movement of the movable element (3) and its pivoting movement from the first in the second position and in order to allow the movable element (3) to return to its first position when the drawer (P1, P2) is closed, provide each movable element (3) with counter devices (12, 13) at its lower and upper ends which are suitable for cooperating with corresponding counter devices of the adjacent movable elements (3), so that each element (3) can approach the adjacent element when it is in its first position and this approach is prevented, when it is in its second position and that at least one elastic device (14) is provided to go onto the column of the movable elements (3) nd to work that all movable elements (3) are brought closer to each other. Safety device according to claim 1, characterized characterized in that both end faces of each movable Elements (3) double-sided inclined surfaces (6-7, 9-10) have and that on the column of movable Elements (3) two opposite elastic Devices (14) act, one being a stronger one Effect than the other. Safety device according to claim 2, characterized characterized that one of the two opposite elastic devices (14) one by one Stop in one direction has limited effect. Safety device according to one of claims 1 to 3, characterized in that only a single end face of each movable element (3) has a bilateral inclined face (6-7, 9-10), while the opposite end has a substantially flat transverse face, and that only an elastic device (14) acts on the column of the movable elements (3). Safety device according to one of the preceding claims, characterized in that at least some of the two-sided inclined surfaces are interrupted at their apex by a recess. Safety device according to one of the preceding claims, characterized in that each movable element (3) has a flat base, which is arranged in a C-shaped rail (1-2) with curved edges (2) and is guided therein and has a tapered shape having. Safety device according to one of the preceding claims, characterized in that each movable element (3) has raised parts (5) from the flat base plate, which form the bilateral inclined surfaces (6-7, 9-10) and the counter-devices which are connected to the cooperate corresponding counter devices of the adjacent elements (3). Safety device according to one of the preceding claims, characterized in that the counter-devices have elevations at one end of the movable element (3) and larger depressions at the opposite end which are oriented with respect to the elevations in the direction of one of the tapered sides of the base plate and smaller ones Have depressions that are aligned with respect to the ridges in the direction of the other tapered side of the base plate. Safety device according to claim 2 or 4, characterized in that the height of each movable element (3) between the projections of the apex of its two bilateral inclined surfaces (6-7, 9-10) or the apex of the single bilateral inclined surface on the Longitudinal axis of the element (3) and the substantially flat transverse surface was measured, corresponds to the distance between the cooperating device of a drawer (P1, P2) and the cooperating device of the drawer below. Safety device according to claim 9, characterized in that the distance corresponds to the height of a drawer (P1, P2). Safety device according to one of the preceding claims, characterized in that a window is provided in at least some of the movable elements (3) which permits the handling of the means for fastening the rail (1-2) to the structure of the piece of furniture. Safety device according to one of the preceding claims, characterized in that it has a fixed support (22) which constitutes one of the connections which limit the increase in height of the column of the movable elements (3) and a rotary block (25-26) which cooperates with the carrier (22) and is actuated by a lock between a first position in which it does not hinder the displacement of an adjacent movable element (3) and a second position in which it displaces the adjacent movable element (3) and thus limits the height increase of the column, so that opening of all the drawers (P1, P2) detected by the device is prevented. Security device according to claim 12, characterized in that the rotary block (25-26) and the respective lock are attached to a small upper drawer which is not provided with any cooperating means, and in that the rotary block (25-26) has a section which forms a rotary latch which connects to the carrier (22) and in this way locks the closed upper drawer against unauthorized opening.

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