EA040732B1 - METHOD AND DEVICE FOR INSERTING ELASTIC LOCKING ELEMENT INTO INSERTION GROOVE IN PANEL FOR FURNITURE PRODUCT - Google Patents

Description

The field of technology to which the invention belongs

Embodiments of the present invention relate to methods and apparatus for inserting an elastic locking element (tongue) into an insertion slot in a panel. The panel is made with the possibility of placement and closing perpendicular to the adjacent panel by means of a locking device containing a tongue. The panels can be assembled and closed together to form a piece of furniture such as a bookshelf, cabinet, wardrobe, drawer, drawer, or furniture component.

State of the art invention

A typical piece of furniture may be assembled from a plurality of elements or panels. The panels can be assembled with a mechanical locking device such as described, for example, in WO 2012/154113 A1. The product contains the first panel connected perpendicularly to the second panel by means of a mechanical locking device containing an edge tongue in the first panel, an edge groove in the second panel and a flexible tongue in the plug-in groove.

Publication WO 2015/038059 discloses an article assembled from a plurality of panels that are locked with mechanical locking devices containing a flexible tongue in a slot.

Panel locks are usually produced on a production line through a continuous production process containing a number of milling tools. The edge groove and the insert groove may extend from the front edge to the rear edge of the panel. The edge groove is preferably covered at the leading edge with a decorative layer. The edge slot and the insert slot can also terminate in front of the leading edge and/or the trailing edge, as described, for example, in SE 1650135-5.

Embodiments of the present invention address the need to provide an improved method and improved apparatus for separating a tongue from a tongue preform prior to inserting the tongue into an insert slot in a panel.

The essence of the invention

Accordingly, embodiments of the present invention are preferably directed to alleviate, alleviate, or eliminate one or more of the disadvantages, inconveniences, or problems in the art, such as those identified above, alone or in any combination, by providing a method of inserting a tongue into an insertion slot in a panel.

Yet another object of the embodiments of the invention is to provide a device for inserting a tongue into an insertion slot in a panel.

Embodiments of the invention may have advantages in that the tongue is guided in a reliable manner close to the correct position and that the weights of the parts of the device that move are low, so that the speed of movement of the parts can be increased and the time to insert the tongue is reduced.

At least some of these and other objects and advantages, which will be apparent from the description, have been achieved by means of a first aspect of the invention, comprising a method for inserting a tongue into a plug-in groove in a panel by means of a device, the method comprising the steps of: moving the guide device to the tongue in the first direction by moving the pusher in the first direction; and moving the tongue between the first part and the second part of the tongue guide and into the plug-in slot in the panel by further moving the pusher.

Embodiments may be preferred for inserting a tab into an embodiment of a plug-in slot in a panel while moving the panel in the feed direction of the panel. Embodiments may be particularly useful for inserting a tongue into an insert slot containing a side wall in the feed direction and/or into an insert slot in an edge slot containing a side wall in the feed direction. The side wall may be the end of an edge slot or a plug-in slot spaced from an adjacent edge of the panel. The tongue guide can be moved close to the open portion of the insert slot so that the tongue can be guided securely close to the correct position. The tongue guide can, after moving the tongue into the insertion slot, be moved to its original position before it encounters any side wall or other obstacle in the panel, which preferably moves continuously in the feed direction.

The method may include moving the pusher in the first direction a greater distance than said moving the tongue guide.

The method may include moving the first portion of the tongue guide a longer distance in the first direction than the second portion of the guide.

The method may include moving the pusher and tongue guide in a second direction, which is opposite to the first direction, to a home position of the pusher and tongue guide, respectively.

The method may include moving the tongue order stop by means of a tongue guide, preferably a protruding portion, and feeding in a new tongue. The new tongue is preferably identical or substantially identical to the tongue.

The method may include moving the new tongue into the tongue guide when

- 1 040732 the first part of the tongue guide has reached or is about to reach its initial position.

The method may include moving the pusher and tongue guide in relation to the tongue sequencer.

The method may include moving the pusher in a first direction, and preferably in a second direction that is opposite to the first direction, by means of a motor, such as an electric motor or a pneumatic motor.

The second aspect of the invention comprises a device for inserting a tongue into a plug-in slot in a panel. The device comprises a tongue guide that is movable in a first direction and a pusher that is movable between the first part and the second part into a plug-in slot in the panel, the tongue guide being movable by the pusher that is moving in the first direction.

The pusher may be movable a greater distance in the first direction than the tongue guide.

The first part of the tongue guide may be movable for a longer distance in the first direction than the second part of the guide.

The pusher and tongue guide can be movable in a second direction, which is opposite to the first direction, to the initial position of the pusher and tongue guide, respectively.

The device may include a movable tab order stop to control the supply of a new tab, wherein the tab order stop is preferably configured to interact with a protrusion on the tab guide. The new reed and the reeds in the reed queue are preferably identical or substantially identical to the reed.

The device may be configured such that the new tongue is moved into the tongue guide when the first portion of the tongue guide has reached or is about to reach its home position.

The pusher and tongue guide can be movable in relation to the tongue storage device.

The device preferably includes a spring element between a power unit such as a motor and a pusher. The spring element may have the advantage that the device and/or the panel is not damaged if any one of the panels, the insertion slot and the plunger is/are in the wrong position(s).

The device may include a motor, such as an electric motor or a pneumatic motor, configured to drive the pusher in a first direction and preferably in a second direction that is opposite to the first direction.

The pusher, the first part and the second part are preferably connected together by a spring element in such a way that the required positions of the pusher, the first part and the second part are obtained.

An advantage of embodiments of the device may be that only one motor is required to drive at least the pusher and guide, and preferably also the sequence stop. The weight of the device can be reduced by having only one motor.

The tongue according to the first and/or second aspect may contain one or more of the following features.

The tongue may be elongated and may include a first long edge and a second long edge. The first edge may be the first short edge and the second edge may be the opposite second short edge.

The longitudinal direction of the tongue is preferably perpendicular to the first direction.

The tongue may be a flexible tongue and is made of, for example, a polymer and preferably contains a reinforcing material such as a fiber, such as glass fiber.

The tab may include a foldable portion at the first long edge and preferably a groove adjacent the foldable portion. The bendable part may be configured to be advanced into a groove adjacent the bendable part. The tongue may comprise several of said flexible portion and preferably several of said grooves.

The tongue may comprise a polymeric material and is preferably manufactured by injection molding.

The tongue may be connected to a plurality of tongues in the tongue blank by means of a first guide on the first short edge and preferably a second guide on the second short edge. The separating device preferably separates the tongue from the first guide, and preferably from any second guide, before the tongue is moved into the tongue storage queue.

- 2 040732

The first guide and the second guide may extend in a length direction perpendicular to the tongue.

The tab may be connected to the first guide and/or the second guide, which may be a molding closure, via the first and second injection closures, respectively.

The tongue is preferably movable in the insertion slot.

Preferably, the device is part of a production line containing milling tools to form a closing device at the edge of the panel. The locking device preferably comprises said plug-in groove.

The edge groove and the insert groove may extend from the front edge to the rear edge of the panel.

Brief description of the drawings

These and other aspects, features and advantages in which the embodiments of the invention are eligible will be apparent and clear from the following description of the embodiments of the present invention, with reference to the accompanying drawings, in which:

fig. 1A-1H show a method for inserting a tongue into a plug-in slot in a panel according to an embodiment of the invention;

fig. 2 shows a schematic enlargement of a device according to an embodiment of the invention in a position corresponding to FIG. 1A;

fig. 3A-3B show schematic enlargement drawings of a device according to an embodiment of the invention in a position corresponding to FIG. 1E;

fig. 4A-4D show embodiments of a tongue according to embodiments of the invention;

fig. 5A-5D show an embodiment of a tongue according to an embodiment of the invention;

fig. 6A-6D show an embodiment of a panel according to embodiments of the invention.

Description of Embodiments

Individual embodiments of the invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different ways and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided such that the present disclosure will be complete and complete, and will fully convey the scope of the invention to those skilled in the art. The terminology used in the detailed description of the embodiments illustrated in the accompanying drawings is not intended to limit the invention. In the drawings, like reference numerals refer to like elements.

The illustrated embodiments of the method for inserting the tongue into the insertion slot and the apparatus for the method may be more efficient. Embodiments may be preferred for inserting a tab into a groin at the edge of the panel while moving the panel in the feed direction of the panel. Embodiments may be particularly useful for inserting a tongue into an insert slot containing a side wall in the feed direction and/or into an insert slot in an edge slot containing a side wall in the feed direction.

An embodiment of the method is shown in figures 1A-1H. The method includes inserting a tongue 30 into an insertion slot 20 in a panel by means of a device, the method comprising: moving the tongue guide in a first direction 91 by moving a pusher 81 in a first direction 91; and moving the tongue 30 between the first part 83 and the second part 82 of the tongue guide and into the plug-in slot 20 in the panel by the pusher 81 by further moving the pusher 81.

The method may include moving the pusher 81 in the first direction 91 a greater distance than said moving the tongue guide. Fig. 1A shows the initial position of the pusher 81 and the guide. The guide device moves in the first position until it reaches the outer end position shown in FIG. 1D while the pusher continues to move until it reaches the outer end position shown in FIG. 1E.

The method may include moving the first portion 83 of the tongue guide a longer distance in the first direction 91 than the second portion 82 of the guide. The first part and the second part may have the same outer end position as shown in FIG. 1D. The first part may have a home position that is at a distance from the home position of the second part, see FIG. 1A. The distance may be substantially the same or longer than the width of the tongue 30.

The method may include moving the pusher 81 and the tongue guide in the second direction 92, which is opposite the first direction 91, to the initial position of the pusher and the tongue guide, respectively. The start of movement of the pusher 81 in the second direction is shown in FIG. 1F. Starting the movement of the guiding device

- 3 040732 in the second direction is shown in FIG. 1G, that is, after the start of the movement of the pusher 81.

The method may include moving the tongue sequence stop 84 by means of the tongue guide in the direction 93, preferably the protrusion 85, and feeding a new tongue 30''' as shown in FIG. 1D. The method may include moving the tab sequence stop in the opposite direction 94 as the tab guide moves in the second direction, see FIG. 1g.

The method may include moving the new tongue 30''' into the tongue guide when the first tongue guide portion 83 has reached, or is about to reach, its home position, as shown in FIG. 1H.

The method may include moving the pusher 81 and the tongue guide in relation to the tongue storage device 100, which may be stationary.

The method may include moving the pusher 81 in the first direction 91, and preferably in the second direction 92, which is opposite to the first direction, by means of a motor (not shown), such as an electric motor or an air motor.

An embodiment of device 80 in the rest position is shown in FIG. 2 and the outer end position is shown in FIG. 3A and 3B. Fig. 3B shows an embodiment of a panel 1 comprising an insert slot 20 in an edge slot 21, a tongue 30, a pusher 81, and a first part 83 and a second part 82 of the tongue guide. The tongue guide moves to a position close to the open part of the insert slot. The distance between the guide device and the open portion is preferably about 1 mm, or may be in the range from about 0.5 mm to about 2 mm. The device comprises a tongue guide which is movable in a first direction 91 and a pusher 81 which is adapted to move the tongue 30 between the first part 83 and the second part 82 and into an insert slot 20 in the panel, the tongue guide being configured to be a movable pusher that is movable in the first direction 91.

Fig. 2 and 3A show a fastening device 88 for connecting the pusher 81 to the engine by means of a connecting element. The connecting element may contain a spring element.

The pusher 81, the first part 83 and the second part 82 of the tongue guide are preferably connected together by the spring members 71, 72 so that the desired positions of the pusher, the first part and the second part of the tongue guide can be obtained.

The pusher 81 can be connected to the connecting device 86 through the second spring 72.

The first tongue guide portion 83 may be attached to the connector 86. The first tongue guide portion 83 may not be movable relative to the connector 86.

The second part 82 of the tongue guide may be attached to the connector 86. The second part 82 of the tongue guide may be connected to the connector via the first spring 71.

An embodiment of the device 80 may include a fixed structural element 101 containing the first guide slot 102. The protruding part 87 of the second part 82 of the guide device can be configured to be moved between the first surface 103 of the first guide slot 102 and the opposite second surface 104 of the first guide slot.

The pusher 81 may be configured to drive the protrusion through, for example, the second spring 72, the coupling device 86 and the first spring 71 between the first surface 103 and the second surface 104 of the first guide slot 102. The first surface 103 and the second surface 104 may determine the range of movement in the first direction 91 and the second direction 92, respectively, of the second part 82 of the guide device.

The second tongue guide portion 82 may include a second guide slot 73 comprising a first surface 61 and an opposing second surface 62. The connector 86 may be movable relative to the second tongue guide portion 82. The first surface 61 and the second surface 62 may define a range of movement in the first direction 91 and the second direction 92, respectively, of the coupling device 86 relative to the second portion 82 of the tongue guide.

The plunger 81 may include a third guide slot 74 comprising a first surface 63 and an opposing second surface 64. The plunger 81 may be movable relative to the connector 86.

The first surface 63 and the opposite second surface 64 of the third guide slot 74 may define a range of movement in the first direction 91 and the second direction 92, respectively, of the pusher 81 relative to the coupling device 86.

The connector 86 is in the rest position shown in FIG. 2 in contact with the second surface 62 of the second guide slot 73, and the first spring 71 is compressed.

- 4 040732

The protruding part of the second part 82 of the guiding device is in the initial position shown in FIG. 2 in contact with the first surface 103 of the first guide slot 102.

The connector 86 is in the rest position shown in FIG. 3A in contact with the second surface 64 of the third guide slot 74, and the second spring 72 is compressed.

The protruding portion 87 of the second guide portion 82 is in the outer end position shown in FIG. 3A in engagement with the second surface 104 of the first guide slot 102.

The pusher 81 can be moved a greater distance in the first direction than the tongue guide.

The first part 83 of the tongue guide can be moved a longer distance in the first direction than the second part 82 of the guide.

The pusher and tongue guide can be movable in a second direction 92, which is opposite to the first direction 91, to the initial positions of the pusher 81 and tongue guide, respectively.

The device may include a movable tab sequence stop 84 to control the supply of a new tab, wherein the tab sequence stop 84 is preferably configured to interact with a protrusion 85 on the tongue guide.

The protrusion 85, which is movable with the tab sequence stop 84, may be attached to the connector 86. The protrusion 85 may not be movable relative to the connector 86.

The device can be configured such that the new tongue 30' moves into the tongue guide when the first tongue guide portion 83 has reached or is about to reach its home position. The new reed and the reeds in the reed queue are preferably identical or substantially identical to the reed.

The pusher 81 and the tongue guide may be movable with respect to the tongue storage device 100, which may be stationary.

The device preferably includes a spring element between a power unit such as a motor (not shown) and a pusher 81. The spring element may have the advantage that the device and/or panel is not damaged if any one panel, insertion slot and the pusher is/are in the wrong position(s).

The device may include a motor (not shown), such as an electric motor or a pneumatic motor, configured to drive the pusher 81 in the first direction 91 and preferably in the second direction 92, which is opposite to the first direction.

The tongue sequence stop 84 is preferably connected to the device via a spring element 75. The tongue sequence stop can be moved in one direction 93 by interaction with the tongue guide device and moved in the opposite direction 94 by the spring element.

An advantage of an embodiment of the device may be that only one motor is required to drive the pusher, the guide and the tongue order stop.

For embodiments of the tongue 30, which can be moved in the insertion slot 20, see FIG. 6A-6D are shown in FIG. 4A-4D. The first embodiment of the tongue, which is shown in FIG. 3A-3B includes foldable projections 31 on the first long edge of the tongue. The first embodiment is shown in a relaxed state in FIG. 4A and in the compressed state in FIG. 4B. The second long edge of the tongue is preferably substantially straight. The first embodiment of the tongue may be inserted into the insert slot with foldable protrusions facing the bottom of the insert slot and a second edge extending past the opening of the insert slot. The second embodiment of the tongue, which is shown in FIG. 4C in a relaxed state, has an elongated shape and is flexible. The second embodiment includes a recess 37 on the first long edge of the tab, and a second edge that is substantially straight. The recess is reduced in the compressed state of the second embodiment. The second embodiment of the tongue may be inserted into the insert slot with the recess 37 facing the bottom of the insert slot and with a second edge extending beyond the opening of the insert slot. The third embodiment of the tongue, which is shown in FIG. 4D includes a first part 38 that is flexible and compressible and a second part 39 that is rigid. The first part may be located in the insertion slot, and the second part may partially extend beyond the insertion slot opening.

The tongue may be configured as any of the movable tongue embodiments disclosed, for example, in WO 2006/043893 and WO 2007/015669, the entire contents of which are hereby incorporated herein by reference.

The tongue may be a flexible tongue, and is made of, for example, a polymer and preferably contains a reinforcing material such as a fiber, such as glass fiber.

Another embodiment of tongue 30 is shown in FIG. 5A-5D. The tongue has an elongated shape and contains the first short edge 34, the opposite second short edge 36, the first long edge

- 5 040732 and the second long edge 32. FIG. 5D shows an enlargement of the area labeled A in FIG. 5A. The tongue comprises several foldable portions 31 on the first long edge and a groove 33 on each foldable portion 31. The tongue comprises a polymeric material and is preferably manufactured by injection molding. The bendable portion 31 is configured to be pushed into the groove 33 in a compressed state of the tongue.

Fig. 5 shows an embodiment of a tongue that is connected to several tongues (not shown) in a tongue blank by a first guide 35 at a first short edge 34 and by a second guide 37 at a second short edge 36. The first guide and the second guide continue in a lengthwise direction perpendicular to the tongue. The tab may be connected to the first guide and/or the second guide, which may be a casting closure, through the first and second casting closure 41, 42, respectively.

Fig. 5B and FIG. 5C shows a cross-sectional view of tongue 30. In FIG. 5B, the tongue is in a relaxed state, and in FIG. 5C - in a compressed state. The distance between the outside of the bendable portion 31 and the second long edge 32 in the compressed state is shorter than in the relaxed state.

The tongue is preferably adapted to be inserted into a panel insertion slot to secure the panel to an adjacent panel.

Fig. 6A-6D show embodiments of panel 1, each of which includes an embodiment of a tongue 30 inserted into an embodiment of an insertion slot 20 connected to an adjacent panel 2. Embodiments of the panel shown in FIG. 6A-6D may be furniture panels. Embodiments of the panel shown in FIG. 6A-6D may be floor panels.

Fig. 6A shows a panel 1 perpendicular to the adjacent panel 2 and attached to the adjacent panel in a first direction and in a second direction which is perpendicular to the first direction. The panel contains an edge groove 21 on the top surface of the panel. The edge groove 21 has a longitudinal shape and extends along the edge of the panel 1. The edge groove contains the mentioned plug-in groove 20, which continues along the edge groove containing the said tongue 30. The adjacent panel contains an edge tongue 22, which contains a groove 10 for the tongue, continuing along the edge of the adjacent panels. The tongue 30 is configured to engage with the tongue groove 10 to lock the panel 1 together with the adjacent panel 2 in a first direction. Edge tongue 22 is configured to engage with edge groove 21 to lock panel 1 together with adjacent panel 2 in a second direction.

Fig. 6B shows a panel 1 perpendicular to the adjacent panel 2 and closed to the adjacent panel in a first direction and in a second direction which is perpendicular to the first direction. The adjacent panel contains an edge groove 21 on the top surface of the adjacent panel. The edge groove 21 has a longitudinal shape and extends along the edge of the adjacent panel 1. The edge groove contains a tongue groove 10 . The panel includes an edge tongue 22, which contains the said plug-in groove 20, which contains the mentioned tongue 30. The plug-in groove extends along the edge tongue. The tongue 30 is configured to engage with the tongue groove 10 to lock the panel 1 together with the adjacent panel 2 in a first direction. Edge tongue 22 is configured to engage with edge groove 21 to lock panel 1 together with adjacent panel 2 in a second direction.

Fig. 6C shows panel 1 parallel to adjacent panel 2 and closed to adjacent panel in a first direction and in a second direction that is perpendicular to the first direction. The panel contains said plug-in groove 20, which extends along the edge of the panel. The edge contains a strip protruding from the edge, and the strip contains a closing element protruding upwards. The adjacent panel 2 comprises a tongue groove 10 extending along the adjacent edge of the adjacent panel 2. The adjacent edge comprises a closing groove with an open portion facing down. The tongue 30 is configured to engage with the tongue groove 10 to lock the panel to the adjacent panel in the first direction, and the closure member is configured to engage the panel locking groove to lock the panel to the adjacent panel in the second direction. An embodiment of said first and second panel comprises an insert groove 20 on the adjacent edge of the adjacent panel and a tongue groove 10 on the edge of the panel.

Fig. 6D shows an embodiment of the panel and adjacent panel shown in FIG. 6A in 3D view. The edge groove 22 continues along the edge 4 of the adjacent panel and ends in front of the adjacent edge 6 of the adjacent panel 2. The edge groove 21 continues along the edge 3 of the panel 1 and ends at the side wall 23 in front of the adjacent edge 5 of the panel 1.

The core material of the panel and adjacent panel embodiments described above may comprise a fibreboard such as HDF, MDF, plywood, solid wood or chipboard, or a reinforced plastics board or composite fibreboard. The core can be provided with a decorative layer.

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Claims (10)

CLAIM 1. A method of inserting an elastic locking element (30) into a plug-in groove (20) in a panel (1) for a furniture product by means of a device, wherein the elastic locking element (30) is movable in the plug-in groove (20) and can be inserted into plug-in groove of the panel for closing the panel (1) in the adjacent panel (2), and the device contains a guide device (82, 83) for guiding the elastic blocking element, containing the first part (83) and the second part (82), which have an extension in the longitudinal direction of the guide device and are located in such a way that between the first part (83) and the second part (82) of the guide device, the pusher (81) can move to move the elastic blocking element (30) located between the first part (83) and the second part ( 82) of the guide device, into a plug-in groove in the panel, the guide device being movable in the first direction (91 ) by moving the plunger in the first direction (91), the method comprising the steps of moving the guide device in the first direction (91) by moving the plunger (81) in the first direction (91); and moving the elastic locking element (30) located between the first part (83) and the second part (82) of the guide device into the plug-in groove (20) in the panel by additionally moving the pusher (81), moving the pusher (81) in the first direction ( 91) for a longer distance than the guide device is moved, the first part (83) of the guide device is moved a longer distance in the first direction (91) than the second part (82) of the guide device. 2. The method according to claim 1, including moving the pusher (81) and guide device in the second direction (92), which is opposite to the first direction (91), to the initial positions of the pusher (81) and guide device, respectively. 3. The method according to claim 2, comprising moving the stop (84) of the order of the elastic blocking element in the direction (93) by means of a guide device, preferably a protruding part (85), and supplying a new elastic blocking element (30'''). 4. Method according to claim 3, including moving the new elastic blocking element (30''') into the guide when the first part (83) of the guide has reached or is about to reach its initial position. 5. The method according to any one of claims 1 to 4, including moving the pusher (81) and the guiding device relative to the storage device (100) for the elastic blocking element, which is stationary. 6. The method according to any one of claims 1 to 5, including moving the pusher (81) in the first direction (91) and preferably in the second direction (92), which is opposite to the first direction, by means of a motor, such as an electric motor or a pneumatic engine. 7. A device for inserting an elastic locking element into a plug-in groove in a panel for a furniture product, wherein the elastic locking element (30) is movable in the plug-in groove (20) and can be inserted into the plug-in groove of the panel to close the panel (1) in adjacent panel (2), wherein the device comprises: a guide device (82, 83) for guiding the elastic blocking element, comprising a first part (83) and a second part (82), which extend in the longitudinal direction of the guide device and are located in such a way that between the first part (83) and the second part (82) of the guide device, the pusher (81) can be moved to move the elastic blocking element located between the first part (83) and the second part (82) of the guide device into the plug-in groove in the panel, and the guide device is movable in the first direction (91) by moving the pusher for (81) in the first direction (91), and the pusher (81) is configured to move in the first direction (91) for a longer distance than the movement of the guide device, with the possibility of moving the elastic blocking element (30) located between the first part (83) and the second part (82) of the guide device, into the plug-in groove (20) in the panel by means of a pusher (81) moved to a longer distance than the guide device, the first part (83) of the guide device being movable by a longer distance in the first direction than the second part (82) of the guiding device. 8. Device according to claim 7, wherein the pusher (81) and guide are movable in a second direction (92), which is opposite to the first direction (91), to the initial positions of the pusher (81) and guide, respectively. 9. The device according to claim 8, wherein the device comprises a movable stop (84) of the order of the elastic blocking element to control the supply of a new elastic blocking element, while the stop (84) of the order of the elastic blocking element is preferably made with the possibility of interacting with the protruding part ( 85) on the guide device. 10. Device according to any one of claims 7 to 9, wherein the device is configured such that the new elastic blocking element (30''') moves into the guide device when the first part (83) is on- -