EP2661195B1 - Lockable ejection device with overload mechanism - Google Patents

Description

The invention relates to a lockable ejection device for a movable furniture part, with a traversable in a cardan cam slide track control, wherein the slide track a closing portion in which the control pin moves when closing the movable furniture part, a locking portion with a detent recess, in which the control pin in the locked position is held, and an opening portion in which the control pin is movable when opening the movable furniture part, wherein in the locking portion, an overload mechanism is arranged, by which the locking position is releasable even when the movable furniture part in the opening direction, wherein the overload mechanism is an overload path Having for the control pin temporarily obstructing, kraftbeaufschlagtes blocking element.

Lockable ejection devices (also called touch-latch mechanisms) are mainly used in drawers and serve to ensure that when the closed drawer is pressed, the drawer is unlocked and an automatic ejection or opening of the drawer takes place. In the first versions of such lockable ejectors ejection could only be done by pressing (overpressure in the closing direction) on the drawer. If, however, it was not pressed when the drawer was closed, but pulled in the opening direction, individual parts could be overloaded or even destroyed.

To avoid this, overload mechanisms have been incorporated in such lockable ejector devices.

An example of such an overload mechanism is from the DE 20 2009 005 256 U1 out. In this case, the area in which the control pin rests in the locked position, for example, rotated when moving the drawer in the opening direction or it opens an overload path in the "heart" of the cardioid cam track. A variant also provides that the slide track itself is formed of two parts and this overload be moved against each other. In all embodiments according to the cited document, a change of the normal, heart-shaped path for the control pin must be made. As a result, always areas of the actual slide track are blocked. Especially if, after such an overload, the moving part does not return to the normal position in time, the normal, heart-shaped path can no longer be passed entirely by the control pin. Thus, it can lead to faulty tripping. But it is also possible that the closed position or locking position is no longer achieved properly.

In a similar way, the shows JP 2007-009507 especially in the Fig. 7 an overload mechanism in which a part of the "heart" of the cardioid cam track can be pivoted in overload and thereby releases a path for the control pin in the opening direction. Again, it is disadvantageous that is adjusted by this pivoting the normal way of the control pin. If this route is not released in time, it can lead to the problems already mentioned above.

From the WO 2007/050737 A2 is a heart curve-shaped locking portion known in the detent recess a control pin engages. In the area of this detent recess a relatively narrow overload channel is already formed in the heart. Since the heart forming parts are made of a flexible material, the control pin can be forced through these flexible parts in case of overload. The disadvantage here is that the flexible materials can wear off with repeated overload movement by the Hindzwzwängen of the control pin, whereby an undesirable broadening of the channel can occur. As a result, an unwanted unlocking can take place even under normal load or with a slight overload.

The object of the present invention is therefore to provide a lockable ejection device which is improved over the prior art. In particular, the overload mechanism should be designed such that the normal path in the slide track remains as unimpaired.

This object is achieved for an ejection device with the features of the preamble of claim 1, characterized in that the blocking element mitbildet at least partially the detent recess of the locking portion and that the lockable by the blocking element overload path leads through a limited by the control pin in overload and limited by a channel wall channel, the is in fixed spatial association with the closing portion and the opening portion and opens into the opening portion, wherein the blocking element is formed separately from the channel wall and movable in the channel. In other words, it is said that when overloaded by the moving in the opening direction control pin only the blocking element in the locking portion of the link path is movable. The other areas (closing section, opening section and at least partially the locking section) remain unchanged. In addition, the locking position can be detached non-destructively by the blocking element. Another advantage of the invention is that not the frictional forces as in the spreading or squeezing of the "heart" (see prior art) provide for the overload protection, but rather allows a well-defined, precisely assigned application of force to the locking element an exact pull release.

In order to enable a defined trip path when moving the movable furniture part in the opening direction, may preferably be provided that the locking element in the locked position blocks a first part of the overload path, wherein the blocking element in case of overload by the control pin in the opening direction against the application of force to the locking element from the overload path obstructing position movable and the first part of the overload path is releasable. Depending on the length (eg 2 to 5 mm) of the first part of the overload path is also the distance that must be exceeded in the opening direction to allow the ejection of the ejector. Accordingly, it is preferably provided that, with the first part of the overload path released, the control pin is movable into a second part of the overload path, in which the ejection device is unlocked and the movable furniture part can be ejected in the opening direction by an ejection spring of the ejection device. Preferably, it may further be provided that the blocking element is subjected to force by a spring, wherein the spring is designed in the form of a compression spring.

Since the control pin is in the locking position both in force-effective connection with the ejection spring and with the blocking element spring, it is provided that the spring force of the spring of the blocking element is greater than the spring force of the ejection spring. This ensures that the blocking element is not released by the ejection spring itself, but only with additional force, which is applied by removing the movable furniture part by a user.

According to a preferred embodiment of the invention can be provided that the control pin in the locking position is applied only to the locking element, i. a large part or the entire detent recess is formed by the blocking element itself.

In principle, the ejection device may be of any desired design and arranged as desired, as described for example in US Pat DE 20 2009 005 256 U1 and JP 2007-009507 are shown. It is only essential that an inventive overload mechanism is present. Nevertheless, a preferred ejection device includes a housing in which the slide track is formed, a slide movable along the housing, wherein the ejection spring is connected at one end to the carriage and at the other end to the housing, a control lever pivotally mounted on the carriage which is arranged in the slide track engaging control pin and arranged on the carriage, preferably pivotally mounted, ejection element for the movable furniture part.

In order to achieve an adjustment of the locking position in such an ejection device, it can preferably be provided that the housing has a displaceable by a depth adjustment part in which the slide track is formed.

Protection is also desired for a piece of furniture with a furniture body, a movable furniture part, in particular a drawer, and a lockable ejection device according to one of claims 1 to 9.

In such a piece of furniture, it is possible that the ejection device is assigned to the furniture body and acts on a driver associated with the movable furniture part. In one embodiment according to the present invention However, in a reverse manner provided that the movable furniture part is mounted on a connected to the furniture part or connectable drawer rail, optionally a center rail, and connected to the furniture carcass cabinet rail slidably on the furniture body, wherein the ejection device on the drawer rail or on the movable Furniture part is arranged and wherein the ejection element, at least in the closed position of the movable furniture part with a arranged on the furniture body or on the carcass rail driver, preferably positively connected.

An essential idea of the invention is also that the ejection of the movable furniture part is done not only by over-pressing the drawer but also by pulling on the drawer. For this purpose, it is preferably provided that passes either by overpressing the movable furniture part from the closed position to a position behind the closed position or by pulling the movable furniture part from the closed position in the opening direction of the control pin from the locking portion in the opening portion or in the second part of the overload path and the ejection device is unlocked, wherein the housing connected to the movable furniture part can be moved relative to the carriage held on the body-fixed carrier by the ejection spring which can be discharged when the ejection device is unlocked, and the movable furniture part can be ejected in the opening direction.

Fig. 1

schematisch ein Möbel mit geschlossener und geöffneter Schublade,

Fig. 2

eine Ansicht einer Schubladenausziehführung samt Schubladenseitenwand und Möbelkorpus,

Fig. 3

einen Teil der Schubladenseitenwand samt Ausziehführung,

Fig. 4

die Fig. 3 mit eingebrachter Ausstoßvorrichtung,

Fig. 5 bis 7

unterschiedliche Stellungen des bewegbaren Möbelteils gegenüber der Korpusschiene,

Fig. 8 bis 12

eine Seitenansicht der Ausstoßvorrichtung in unterschiedlichen Stellungen,

Fig. 13

die Ausstoßvorrichtung als eine Baueinheit,

Fig. 14 und 15

Explosionsdarstellungen der Ausstoßvorrichtung von zwei verschiedenen Seiten,

Fig. 16 und 17

3D-Ansichten des verschiebbaren Teils des Gehäuses mit Sperrelement,

Fig. 18

schematisch die unterschiedlichen Stellungen des Steuerzapfens in der Kulissenbahn beim Überdrücken,

Fig. 18a

den Kraftverlauf der Federn passend zu Fig. 18,

Fig. 19

schematisch den Verlauf des Steuerzapfens in der Kulissenbahn bei Überlast,

Fig. 19a

den Kraftverlauf der Federn passend zu Fig. 19 und

Fig. 20 bis 25

in 3D-Darstellungen und Details unterschiedliche Stellungen des Steuerzapfens in der Kulissenbahn.

Further details and advantages of the present invention will be explained in more detail below with reference to the description of the figures with reference to the exemplary embodiment illustrated in the drawings. Show:

Fig. 1

schematically a piece of furniture with a closed and opened drawer,

Fig. 2

a view of a drawer pull-out guide including drawer side wall and furniture body,

Fig. 3

a part of the drawer side wall with pull-out guide,

Fig. 4

the Fig. 3 with ejector device,

Fig. 5 to 7

different positions of the movable furniture part relative to the carcass rail,

8 to 12

a side view of the ejector in different positions,

Fig. 13

the ejection device as a structural unit,

FIGS. 14 and 15

Exploded views of the ejection device from two different sides,

FIGS. 16 and 17

3D views of the displaceable part of the housing with blocking element,

Fig. 18

schematically the different positions of the control pin in the slide track when overpressing,

Fig. 18a

the force curve of the springs to match Fig. 18 .

Fig. 19

schematically the course of the control pin in the slide track in case of overload,

Fig. 19a

the force curve of the springs to match Fig. 19 and

Fig. 20 to 25

in 3D representations and details different positions of the control pin in the slide track.

Fig. 1 shows a furniture 15, comprising a furniture body 16 and two movable furniture parts 2. The upper movable furniture part 2 is in the closed position SS, wherein the control pin 4 is held in the slide track 3 in the locked position VS. This control pin 4 is connected via a control lever 12 with a in the (only schematically indicated here) housing 10 movable carriage 11. This carriage 11 is connected to the housing 10 via an ejection spring 8, wherein in this locking position VS the ejection spring 8 (tension spring) is stretched. The ejection device 1 is mounted on the drawer rail 17, wherein the drawer rail 17 is locked relative to the carcass rail 18, that is not movable, since the drawer rail 17 is held on the driver 19 of the carcass rail 18 via the ejection device 1 and its ejection element 13 (with locking hook).

Now takes place - as with the lower movable furniture part 2 of Fig. 1 shown - a release (both by overpressing and by pulling on the movable furniture part 2 possible), the control pin 4 passes outside the locking portion 3b of the slide track 3. Since then the carriage 11 is no longer locked in the slide track 3, the ejection spring 8 contract, whereby the housing 10 of the ejection device 1 is moved together with the attached thereto movable furniture part 2 in the opening direction OR. Since the carriage 11 itself still positively via the ejection element 13 with the driver 19 is connected, there is a displacement of the housing 10 relative to the carriage 11 and the movable furniture part 2 is in the open position OS.

In Fig. 2 a side wall of the movable furniture part 2 and the container rail 20 is shown, which is held on the drawer rail 17 which is poorly visible here. Under this drawer rail 17 and under the container rail 20, the ejection device 1 is attached.

In Fig. 3 the drawer side wall 21 is shown. The driver 19 is attached via a mounting member 22 on the carcass rail 18.

In Fig. 4 the drawer side wall 21 is shown together with the attached to the drawer rail 17 ejector 1. In this case, the connecting element 23 for synchronization with a second ejection device, which is associated with another, not shown, drawer side wall, and a depth adjustment device 14 can be seen.

In Fig. 5 is removed from the ejector 1, the housing cover 10c, whereby an insight into the ejection device 1 is given. It can be seen that the ejection element 13 (locking hook) is positively connected to the driver 19. This ejection element 13 moves in the guideway 24. In addition, the ejection spring 8 and the spring 9 for the blocking element 7 is shown.

In Fig. 6 the movable furniture part 2 together with drawer side wall 21 is moved further in the opening direction OR, wherein the ejection element 13 has entered the bevelled end region of the guide track 24 and thereby pivots relative to the carriage 11 and releases the driver 19. From this time or from this position, the movable furniture part 2 can be moved freely in the opening direction OR (see also Fig. 7 ).

In Fig. 8 is a view of the ejector 1 from the furniture center shown. In this case, the housing cover 10c is completely removed. In addition, a part of the displaceable part 10a is also hidden, whereby one has a view of the sliding part 3 formed in the sliding part 10a. In this Fig. 8 is located the control pin 4 in the locked position VS and is in the locking recess 5 on the locking element 7 at.

In Fig. 9 the control pin 4 is shown in the overpressed position Ü and passes from the locking portion 3b in the opening portion 3c (see also Fig. 18 ).

In Fig. 10 has already used the effect of the ejection spring 8, whereby the mounting part 10b of the housing 10 relative to the carriage 11 moves in the opening direction OR, since the carriage 11 itself is held over the ejection element 13 (with locking hook) on the driver 19 and thus on the furniture body 16. The control pin 4 is shown just before driving over the branch element 25, wherein the control pin 4 presses this spring-loaded branch element 25 downwards, which returns to the starting position after passing over. This allows when moving the control pin subsequently in the closing direction SR, that the control pin 4 is not in the opening portion 3c but in the closing portion 3a passes or is deflected.

In Fig. 11 the ejection spring 8 has completely discharged (ie contracted) and the carriage 11 has moved the ejection element 13 into the oblique end section of the guide track 24 so that the ejection element 13 pivots and the positive engagement between the ejection element 13 and the driver 19 is canceled.

In Fig. 12 the ejection device 1 is no longer held on the driver 19, whereby the entire movable furniture part 2 is freely movable.

Fig. 13 shows the narrow and elongated ejector 1 in the assembled state.

In the Fig. 14 and 15 an exploded view of the ejection device 1 is shown from different sides. As large components, this ejection device 1 has a housing 10 consisting of the mounting part 10b, the housing cover 10c and the displaceable part 10a. About the mounting part 10 b is the ejector 1 with the movable furniture part 2 and with the Shop rail 17 connected. The housing cover 10c is fixedly connected to the mounting part 10b via conventional connection means. Between these two parts, the displaceable part 10a is arranged, wherein the displacement and thus the depth of Verrieglungsstellung the entire drawer 2 can be adjusted via the depth adjustment 14. This rotatable depth adjustment device 14 has on its underside a helical worm 14b, which correspond with rasters 14a attached to the displaceable part 10a. In the displaceable part 10 a, the slide track 3 is formed, wherein the detent recess 5 of the slide track 3 is formed by the blocking element 7. This blocking element 7 is in the guides 29 (see FIGS. 16 and 17 ) and displaceably mounted by the spring 9 (compression spring). Compared to the entire housing 10, the carriage 11 is mounted movable or displaceable. On this carriage 11, the control lever 12 is pivotally mounted and has at one end the control pin 4, which engages in the slide track 3. In addition, at one end of the carriage 11, the ejection element 13 is pivotally mounted. The carriage 11 further has synchronization teeth 26, which correspond to a connecting element 23 to which a synchronization rod, not shown, can provide for connection to a further ejection device on the other drawer side. Furthermore, the ejection device 1 has an ejection spring 8, which is held between the spring holder 27 on the housing cover 10c and the spring holder 28 on the carriage 11.

In Fig. 18 is schematically shown the way of the control pin 4 in the slide track 3. This is fitting in Fig. 18a in each case the spring force F _{8 of} the ejection spring 8 and the spring force F _{9 of} the spring 9 for the blocking element 7 are shown. The entire process begins with the movement of the movable furniture part 2 from an open position OS in the closing direction SR. In this case, the control pin 4 first reaches the position I. In this area, the ejection spring 8 and thus its spring force F ₈ is already stretched. Upon reaching the position II, the highest spring force F _{8 of} the ejection spring 8 is reached. This position II also represents the transition between the opening portion 3a and the locking portion 3b of the slide track 3. In the locking portion 3b, the control pin 4 reaches the position III, in which the control pin 4 rests against the catch recess 5 and thus on the locking element 7. This represents the locking position VS and corresponds to the closed position SS of the movable furniture part 2. If then from this closed position SS moving the Furniture part in the closing direction SR takes place (overpressure), the control pin 4 is in the position IV, which represents the transition between the locking portion 3b and the opening portion 3c. Once the control pin 4 then reaches the opening portion 3c, the locking position VS is released and the ejection spring 8 can unfold its spring force F ₈ and eject the movable furniture 2. During this ejection process, the control pin 4 reaches the positions V and VI and moves over the branch element 25.

In contrast, in Fig. 19 and Fig. 19a the schematic sequence and the positions of the control pin 4 in the slide track 3 and in the overload path W shown. The overload path W leads through a channel formed in the "heart", which is delimited by channel walls. This channel is in fixed spatial allocation to the sections 3a, 3b and 3c. Again at position I, the closing of the movable furniture part 2 and thus the movement of the control pin 4 in the opening portion 3a and reaches the position II. In this area, the ejection spring 8 and its spring force F _{8 is} stretched. After reaching the locking portion 3b, the control pin 4 enters the position III, which corresponds to the locking position VS. In contrast to Fig. 18 is now not acted upon in the closing direction SR on the movable furniture part 2, but there is a pulling on the movable furniture part 2 in the opening direction OR. As a result, the overload mechanism 6 comes into play, wherein the control pin 4 presses by moving in position IV against the locking element 7 and thereby compresses the spring 9. In this case, the control pin 4 is now in the first part W1 of the overload path W, which can be locked by the blocking element 7. At the end of the first part of the overload path W1, the control pin 4 is moved by the deflection bevel 31 to the left and enters the position V. In this position V, the spring force F _{9 of} the spring 9 of the locking element 7 is highest. At the same time, the spring force F _{8 of} the ejection spring 8 is already slightly relieved. Only when the control pin 4 has completely pressed the extension 32 of the locking element 7, the spring force F _{9 of} the spring 9 of the locking element 7 is overcome and the control pin 4 enters the second part W2 of the overload path W, in which the locking position VS is repealed and the Ejection spring 8 begins to act, whereby the control pin 4 reaches the positions VI and VII. Immediately after overcoming the left extension 32, the spring 9 relaxes again and moves the locking element 7 back to the position according to Fig. 18 ,

The advantage of this embodiment is that the blocking element 7 so to speak forms a bypass line through the heart 30 of the slide track 3. The blocking element 7 obstructs this overload path W and releases it only in the event of an overload. In contrast, the sections 3a, 3b and 3c of the slide track 3 remain unchanged and always have a fixed spatial allocation to the lockable overload path W. As a result, no jamming of the control pin 4 in the spatially fixed mutually formed sections 3a, 3b and 3c of the slide track 3 can take place even when quickly moving up and moving.

In Fig. 20 is shown in a 3D representation of the control pin 4 in the locked position VS, wherein it rests in the detent recess 5 of the locking element 7. Preferably, it is provided that the channel through which the overload path W leads, along the overload path W has substantially constant width B of the channel wall, which is slightly larger than the diameter D of the overload path W movable control pin 7. That is, the control pin 4 fits exactly through the overload path W formed by the channel, this having a slightly larger width B in the first part W1.

In the Fig. 21 to 23 the overload path W for the control pin 4 can be seen, these figures with the Fig. 19 correspond. In contrast, the show Fig. 24 and 25 the normal way with overpressure of the control pin 4 in position Ü, which essentially with the Fig. 18 correspond.

Claims (12)

1. A lockable ejection device (1) for a moveable furniture part (2), comprising a control pin (4) moveable in a cardioid-shaped sliding guide track (3), wherein the sliding guide track (3) has

   - a closing portion (3a) in which the control pin (4) moves upon closure of the moveable furniture part (2),

   - a locking portion (3b) having a latching depression (5) in which the control pin (4) is held in the locking position (VS), and

   - an opening portion (3c) in which the control pin (4) is moveable upon opening of the moveable furniture part (2),
   wherein arranged in the locking portion (3b) is an overload mechanism (6) by which the locking position (VS) is releasable even upon movement of the moveable furniture part (2) in the opening direction (OR), wherein the overload mechanism (6) has a blocking element (7) which is subjected to a force and which temporarily blocks an overload path (W) for the control pin (4), characterised in that the blocking element (7) at least partially also forms the latching depression (5) of the locking portion (3b) and the overload path (W) which is blockable by the blocking element (7) leads through a passage which can be passed through by the control pin (4) upon an overload and which is defined by a passage wall and which is in a fixed spatial relationship with the closing portion (3a) and the opening portion (3c) and which opens into the opening portion (3c), wherein the blocking element (7) is provided separately from the passage wall and is moveable in the passage.
2. An ejection device as set forth in claim 1 characterised in that the control pin (4) only bears against the blocking element (7) in the locking position (VS).
3. An ejection device as set forth in claim 1 or claim 2 characterised in that the blocking element (7) in the locking position (VS) blocks a first part (W1) of the overload path (W), wherein in an overload situation the blocking element (7) is moveable by the control pin (4) in the opening direction (OR) against the force actuation of the blocking element (7) out of the position of blocking the overload path (W) and the first part (W1) of the overload path (W) is cleared.
4. An ejection device as set forth in claim 3 characterised in that when the first part (W1) of the overload path (W) is cleared the control pin (4) is moveable into a second part (W2) of the overload path (W), in which the ejection device (1) is unlocked and the moveable furniture part (2) can be ejected in the opening direction (OR) by an ejection spring (8) of the ejection device (1).
5. An ejection device as set forth in one of claims 1 through 4 characterised in that the spring element (7) is subjected to a force by a spring (9).
6. An ejection device as set forth in claim 5 characterised in that the spring force (F₉) of the spring (9) of the blocking element (7) is greater than the spring force (F₈) of the ejection spring (8).
7. An ejection device as set forth in one of claims 1 through 6 characterised in that the overload path (W) is of a width (B) which remains substantially the same along the overload path (W) and which is slightly greater than the diameter (D) of the control pin (7) moveable in the overload path (W).
8. An ejection device as set forth in one of claims 1 through 7 characterised by

   - a housing (10) in which the sliding guide track (3) is provided,

   - a slider (11) displaceable along the housing (10), wherein the ejection spring (8) is connected with one end to the slider (11) and with the other end to the housing (10,

   - a control lever (12) which is mounted pivotably to the slider (11) and on which the control pin (4) engaging into the sliding guide track (3) is arranged, and

   - an ejection element (13) for the moveable furniture part (2), which is arranged on the slider (11) and which is preferably pivotably mounted.
9. An ejection device as set forth in claim 8 characterised in that the housing (10) has a portion (10a) which is displaceable by a depth adjusting device (14) and in which the sliding guide track (4) is provided.
10. An article of furniture (15) comprising a furniture carcass (16), a moveable furniture part (2), in particular a drawer, and a lockable ejection device (1) as set forth in one of claims 1 through 9.
11. An article of furniture as set forth in claim 10 characterised in that the moveable furniture part (2) is mounted displaceably to the furniture carcass (16) by way of a drawer rail (17) which is or can be connected to the furniture part (2), optionally a central rail, and a carcass rail (18) connected to the furniture carcass (16), wherein the ejection device (1) is arranged at the drawer rail (17) or at the moveable furniture part (2) and wherein the ejection element (13) at least in the closed position (SS) of the moveable furniture part (2) is connected preferably in positively locking relationship to an entrainment member (19) arranged on the furniture carcass (16) or on the carcass rail (18) respectively.
12. An article of furniture as set forth in claim 10 or claim 11 characterised in that

    - either by overpressing the moveable furniture part (2) from the closed position (SS) into a position behind the closed position (SS),

    - or by pulling the moveable furniture part (2) out of the closed position (SS) in the opening direction (OR),
    the control pin (4) passes out of the locking portion (3b) into the opening portion (3c) or into the second part (W2) of the overload path (W) in which the ejection device (1) is unlocked, wherein the ejection spring (8) which can be unloaded when the ejection device (1) is unlocked provides that the housing (10) connected to the moveable furniture part (2) is moveable relative to the slider (11) held on the entrainment member (19) that is fixed with respect to the carcass, and the moveable furniture part (2) can be ejected in the opening direction (OR).

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