EP1712974B1 - Retractable rotating knob of a switch or positioning device, especially of a household appliance - Google Patents

Description

The present invention relates to a retractable rotary handle device of a switching or adjusting device, in particular a household appliance, with a variable in different angular positions rotary knob which is axially movable between an outer located in front of an outer surface of the device Drehwinkelverstell position and a sunk in this area position, a two-part executed, rotatably connected to the rotary knob axis of rotation with an inner axially fixed axis member and an outer on this by means of a sliding guide axially displaceable sleeve-shaped axis member and arranged between the two axis organs compression spring for returning the knob to its outer non-recessed position, wherein the slotted guide a on the outer surface of the inner axis member provided guide track on which a with the outer axis organ axially fixed body is guided, so that after a Win keleinstellung the knob in its outer position of this knob is retracted by an axially directed, exerted on him first compressive force in the outer surface and is locked in its retracted position therein, and by a second axially directed pressure of the push button is releasable again, so that he under effect the return spring can return in its outer position.

Turning handle devices of the aforementioned type are already known. However, these known devices have the disadvantage that in the guideway, which is designed as a groove, guided body is designed as an additional separate part which must be slidably inserted into the outer sleeve-shaped axis part transverse to its longitudinal axis, which the structure and the Assembly of the device complicates.

From the publication WO 98/11574 a retractable rotary handle device is known which has a switching position in which it protrudes from a front panel of a household appliance, and having a rest position in which it is recessed in the front panel. The knob is formed of only three parts, namely a head part having an axis on a hollow cylindrical part, a hollow cylindrical counterpart which engages in the hollow cylindrical part of the head part, and a spring mechanism which is introduced between the two hollow cylindrical parts. The introduced between the two hollow cylindrical parts spring mechanism has a slotted guide, which has an aligned substantially parallel to the axial direction of the knob arm which is elastically deflected from its rest position, but which is both in the rest position of the knob and in the switching position of Knob is in non-elastically deformed state.

The publication EP-A-1 526 422 relates to a retractable rotary handle device of a switching or adjusting device of a household appliance. The rotary handle device has an adjustable in different angular positions knob whose axis of rotation has an inner, non-rotatably connected to the knob axis member and an outer sleeve-shaped axis member, wherein the outer axis member is equipped with a radially deflectable arm, both in its rest position and in his locked position is in non-elastically deformed state.

The invention has for its object to provide a retractable rotary handle device of the aforementioned type, which no longer has the shortcomings of the known device.

To solve this problem, the inventive rotary handle device is characterized in that said guided member is a radially inwardly projecting nose at the end of an integrally formed with the outer sleeve part, substantially parallel to the longitudinal direction of the arm is laterally deflected elastically from its rest position , And that the track part of the slotted guide has a leadership level, and that the nose has a projection.

Further features of the invention are set forth in subclaims.

• Die Figur 1 ist eine perspektivische Ansicht einer erfindungsgemässen versenkbaren Drehgriffvorrichtung ;
• Die Figuren 2 und 3 zeigen die erfindungsgemässe Drehgriffvorrichtung in einer Seitenansicht in ihren zwei Stellungen in der Bedienungsblende eines Haushaltsgeräts ;
• Die Figur 4 ist eine Ansicht in Richtung des Pfeils IV der Figur 3 ;
• Die Figur 5 ist eine Seitenansicht des äusseren hülsenförmigen Achsenorgans der erfindungsgemässen Drehgriffvorrichtung ;
• Die Figur 6 ist eine Ansicht in Richtung des Pfeils VI der Figur 5 ;
• Die Figur 7 ist eine Schnittansicht gemäß der Linie VII-VII der Figur 6 ;
• Die Figuren 8 und 9 sind Ansichten in Richtung der Pfeile VIII bzw. IX der Figur 6 ;
• Die Figur 10 ist eine Seitenansicht des inneren Achsenorgans 6 der erfindungsgemässen Drehgriffvorrichtung ;
• Die Figur 11 ist eine Ansicht in Richtung des Pfeils XI der Figur 10 ;
• Die Figur 12 ist eine Schnittansicht entlang der Linie XII-XII der Figur 11 ;
• Die Figuren 13 und 14 sind Ansichten in Richtung der Pfeile XIII bzw. XIV der Figur 11 ;
• Die Figur 15 ist eine Schnittansicht entlang der Linie XV-XV der Figur 11 ;
• Die Figur 16 ist eine Seitenansicht des inneren Achsenorgans einer zweiten Ausführungsform der erfindungsgemässen Drehgriffvorrichtung ;
• Die Figur 17 ist eine Ansicht in Richtung des Pfeils XVII der Figur 16 ;
• Die Figur 18 ist eine Schnittansicht gemäß der Linie XVIII-XVIII der Figur 17 ;
• Die Figuren 19 und 20 sind Ansichten entsprechend der Pfeile XIX bzw. XX der Figur 17 ;
• Die Figur 21 ist eine Schnittansicht gemäß der Linie XXI-XXI der Figur 17 ;
• Die Figur 22 ist eine Seitenansicht des äusseren Achsenorgans 5 der zweiten Ausführungsform der erfindungsgemässen Drehgriffvorrichtung ;
• Die Figur 23 ist eine Ansicht in Richtung des Pfeils XXIII der Figur 22 ;
• Die Figur 24 ist eine Schnittansicht gemäß der Linie XXIV-XXIV der Figur 23 ;
• Die Figuren 25 und 26 sind Ansichten in Richtung der Pfeile XXV bzw. XXVI der Figur 23 ;
• Die Figur 27 zeigt die Achse der Drehgriffvorrichtung der zweiten Ausführungsform in ihrer äusseren Stellung des Drehknopfes entsprechenden Figuration ;
• Die Figur 28 ist eine Schnittansicht gemäß der Linie XXVIII-XXVIII der Figur 27 ;
• Die Figur 29 entspricht der Figur 27 und zeigt jedoch die Achse in ihrer der inneren Stellung des Drehknopfes entsprechenden Stellung ;
• Die Figur 30 ist eine perspektivische Ansicht einer Ausführungsvariante des inneren Achsenorgans der zweiten Ausführungsform der Erfindung ;
• Die Figur 31 ist eine Ansicht in Richtung des Pfeils XXXI der Figur 30 ;
• Die Figur 32 ist eine Schnittansicht gemäß der Linie XXXII-XXXII der Figur 31 ;
• Die Figur 33 ist eine Ansicht in Richtung des Pfeils XXXIII der Figur 31, und
• Die Figur 34 ist eine perspektivische Ansicht des dem Hülsenorgan der Figur 30 zugeordneten federnden Arms des äusseren Hülsenorgans der Ausführungsvariante der zweiten Ausführungsform.

In the following, the invention will be described in detail, with reference to the accompanying drawings, which serve only as exemplary embodiments and on which:

• The FIG. 1 is a perspective view of a retractable rotary handle device according to the invention;
• The FIGS. 2 and 3 show the inventive rotary handle device in a side view in its two positions in the control panel of a household appliance;
• The FIG. 4 is a view in the direction of arrow IV of FIG. 3 ;
• The FIG. 5 is a side view of the outer sleeve-shaped axis member of the inventive rotary handle device;
• The FIG. 6 is a view in the direction of arrow VI of FIG. 5 ;
• The FIG. 7 is a sectional view along the line VII-VII of FIG. 6 ;
• The FIGS. 8 and 9 are views in the direction of the arrows VIII and IX of FIG. 6 ;
• The FIG. 10 is a side view of the inner axle member 6 of the inventive rotary handle device;
• The FIG. 11 is a view in the direction of the arrow XI the FIG. 10 ;
• The FIG. 12 is a sectional view taken along the line XII-XII of FIG. 11 ;
• The FIGS. 13 and 14 are views in the direction of the arrows XIII and XIV of FIG. 11 ;
• The FIG. 15 is a sectional view taken along the line XV-XV of FIG. 11 ;
• The FIG. 16 is a side view of the inner axis member of a second embodiment of the inventive rotary handle device;
• The FIG. 17 is a view in the direction of arrow XVII the FIG. 16 ;
• The FIG. 18 is a sectional view according to the line XVIII-XVIII of FIG. 17 ;
• The FIGS. 19 and 20 are views according to the arrows XIX and XX of FIG. 17 ;
• The FIG. 21 is a sectional view along the line XXI-XXI of FIG. 17 ;
• The FIG. 22 is a side view of the outer axis member 5 of the second embodiment of the inventive rotary handle device;
• The FIG. 23 is a view in the direction of arrow XXIII the FIG. 22 ;
• The FIG. 24 is a sectional view according to the line XXIV-XXIV of FIG. 23 ;
• The FIGS. 25 and 26 are views in the direction of arrows XXV or XXVI the FIG. 23 ;
• The FIG. 27 shows the axis of the rotary handle device of the second embodiment in its outer position of the knob corresponding Figuration;
• The FIG. 28 is a sectional view according to the line XXVIII-XXVIII of FIG. 27 ;
• The FIG. 29 equals to FIG. 27 and but shows the axis in its position corresponding to the inner position of the knob;
• The FIG. 30 Fig. 13 is a perspective view of an embodiment of the inner axle member of the second embodiment of the invention;
• The FIG. 31 is a view in the direction of the arrow XXXI the FIG. 30 ;
• The FIG. 32 is a sectional view according to the line XXXII-XXXII of FIG. 31 ;
• The FIG. 33 is a view in the direction of arrow XXXIII of FIG. 31 , and
• The FIG. 34 is a perspective view of the sleeve organ of FIG. 30 associated resilient arm of the outer sleeve member of the embodiment of the second embodiment.

The FIG. 1 shows the inventive retractable rotary handle device for a switching or adjusting device of a control panel having a household appliance in a perspective view. This device, which carries the reference numeral 1, essentially has a rotary knob 2, which is mounted on one end 3 of a rotatable shaft 4 rotatably. The axle 4 is made in two parts and has an outer axle body 5 which carries the knob 2 and an inner axle body 6, on which the outer sleeve-shaped axle body 5 is axially displaceable, but without being able to rotate on this body 6. The rotationally fixed connection of the two axle body 5 and 6 is achieved in that the cross sections of the two bodies are listed out of round. According to the FIG. 1 The two bodies have a substantially circular cross-section which is flattened in a region, so that on the bodies 5 and 6, a flat surface 13 or 14 is formed.

As the FIG. 2 shows, the inventive handle device is used in the designated 8 control panel of a household appliance, not shown. In the on the FIG. 2 shown position, the control knob 2 outwardly beyond the aperture 8, so that it can be rotated by hand. The consequently rotatable knob 2 penetrates the aperture 8, which has a corresponding circular aperture 9 for this purpose. In this externally operable position of the knob 2 and thus the handle device 1, the inner axle body 6 protrudes maximally over the inner end face 11 of the outer axle body 5 axially inwards. It should be noted that the inner axle body 6 always rests with its inner end face 12 on a fixed bearing surface 13 designated with the adjusting device. The FIG. 3 shows the inventive device 1 in its sunk into the control panel 8 position in which the knob 2 is practically aligned with the outer surface of the panel and consequently can not be rotated by hand. In this position, the inner axle member 6 projects axially only a small amount from the outer axle member, always in abutment with its end face 12 on the device-fixed support surface 13.

The retractable rotary handle device 1 is in its on the FIG. 3 locked position shown lockable. It can be unlocked by a slight further depression of the button 2. This operation of the device 1 is made possible by a slotted guide mechanism, which will be described below, and the axial sliding movement of the outer axis member 5 on the inner axis member 6 between the two on the FIGS. 2 and 3 shown end positions of the button 2 allowed.

To form the slide guide mechanism, the outer axle member 5 has an axially extending arm 16 which is radially and laterally, ie substantially tangentially resilient in a window 18 in the wall of the sleeve-shaped member 5 is deflectable. The window 18 is provided axially in the middle of the flat surface 13 and the arm 16 extends centrally in the window. At the on the FIGS. 1 to 14 illustrated first embodiment is the root 17 of the arm near the outer end of the axle body 5 and the free end 21 in the vicinity of the inner end with its inner end face 11 of the body 5. The free radially and laterally elastically deflectable end 21 of the arm 16 has an inwardly directed to the axis of the organ 5 Nose 23, which has a special shape that will be described below. This nose 23 protrudes into a special gate guide groove 25, which is incorporated in the flattened outer wall 14 of the inner axle body 6. This groove has a substantially heart-shaped shape 26 in the inner half of the organ 6, which on the FIG. 1 protrudes from the organ 5. The groove 25 has a rectilinear portion 27 which extends symmetrically to the axial axis of symmetry from the apex of the heart to the outer end of the organ 6 and is interrupted by a transverse web 28 in the vicinity of this end. The heart-shaped portion 26 of the displacement path of the nose of the arm forming groove has two laterally offset from the axis of symmetry and parallel to the axis XX extending straight groove portions 29, 30 of different lengths. The shorter portion 29 is connected to the rectilinear axial portion 27 by a rectilinear connection portion 31 which is inclined with respect to the axial portions 29, 30 at a relatively small angle. The second axis-parallel groove portion 30 is connected to the axial and central groove portion 27 by a wider but shorter and steeper groove portion 38.

The heart-shaped groove portion 26 is closed to the free end 12 of the member 6 through a substantially Z-shaped wall 32. This wall has an outer wall portion 33 which extends from the outer wall of the shorter axially parallel groove portion 29 obliquely to the axis of the part 6 in the direction of the free end 12, and a central wall portion 34 which is substantially parallel to the wall portion 31 to the axis, However, in the opposite direction to the part 33 extends and forms with the latter a V, the tip of which is directed towards the end face 12. The end 36 of the central wall portion 34 is located with respect to the axis XX of the inner axis member 6 at a distance which is smaller than the distance from this axis At the middle wall portion 34 of the substantially Z-shaped end wall 32 of the heart-shaped groove portion 26, a wall 39 connects, in the illustrated embodiment of the invention approximately at right angles to the wall portion 34 practically to the outer wall 40 of the longer axially parallel groove portion 30 extends, except for a short mouth part, which is directed approximately at right angles to this wall 40.

The Z-shaped wall 32 opposite the heart-shaped groove 26 is bounded by an inner wall 42. The inner wall 42 has a V-shaped profile, the tip 43 is directed away from the free end 12 and thus causes a latching of the nose 23 of the resilient arm 16. The bottom of the groove part 45, which connects the two axially parallel Herznutenbereiche 29 and 30 between the boundary walls 39 and 42 increases progressively toward the groove portion 30 so that in the extension to the groove portion 30 bounded inner wall 46, a step 47 is present, which extends to the outer wall portion 39 of the Z-shaped end wall 32.

The nose 23 at the end 21 of the elastically deflectable arm 16 of the outer axle member 5 is formed according to the configuration of the groove in which it slides. For this purpose, the front side surface 49 of the nose 23 has a V-shaped profile which corresponds to that of the two wall parts 33, 34 of the Z-shaped end wall 32 of the heart-shaped groove 26. The inner side 50 of the nose 23 also has a V-shaped profile which corresponds to that of the inner wall 42 of the Verbindungsnutteils 45. The Nutengrund directed towards the end face 51 of the nose 23 is chamfered in a region 52, corresponding to the ramp in the bottom of the Verbindungsnutteils 45th

The embodiment of the retractable knob device according to the invention just described works as follows.

The FIG. 2 shows the device in the non-recessed position of the knob 2, in which it can be rotated. The outer axle body 5 is thereby held axially on the inner body 6, in spite of the compression spring 7 apart, that the nose 23 of the spring arm 17 with its rear side surface 50 on the corresponding profile having a crosspiece 28 which interrupts the groove 27, is applied. This engaging behind the web 28 through the nose 23 was due to the elastic radial deflection to the outside of the end 21 of the arm 16 when attaching the outer axle member 5 on the inner axle member 6 allows. The arm 16 is in its central, laterally deflected position. He is not deformed in the lateral direction.

After adjusting the rotary head 2 in its desired angular position, the button is pressed into the control panel, so that he on the FIG. 3 represented position and locked in this position. During this indentation, the nose 23 of the resilient arm 16 slides first in the rectilinear central groove 27 and then along the inner wall of the oblique groove portion 21 and the subsequent axially parallel groove portion 29 until it abuts the Z-shaped closure wall 32 of the heart-shaped groove 26 in the area of the walls 33 and 34. Now, when the pressure on the button 2 stops, the nose 23 slides under the action of the axial compression spring 7 and the elastic restoring force of the spring directed towards the axis XX along the oblique walls 34 and 42 of the transverse Groove connection part 45 until the nose 23 then engages in the recess of the V-shaped groove wall 42. In In this position, the arm is again in its neutral, laterally undeformed middle position.

Upon a further pressure on the knob 2, the nose 23 slides along the inclined groove wall 39 in the axially parallel groove 30 of the heart-shaped guide groove 26. When now the pressure on the button stops, the nose can freely under the force of the compression spring 7 in the straight groove area 30, the oblique, adjoining groove portion 30 and the axial groove portion 27 slide, so that the head 2 in his on the FIG. 2 shown external position can return. The step 47 prevents the arm end from returning to the transverse region 45.

At the on the FIGS. 1 to 15 illustrated embodiment of the invention, which has just been described, the resilient arm 16 extends with its free end in the direction of the inner end 11 of the outer axle body 5. As a result, the arm is subjected to train and bending.

The FIGS. 16 to 29 show another embodiment of a retractable rotary handle device according to the invention. In these figures, the different in their form but functionally comparable to the first embodiment of the organs, parts and detail have the same reference number, but now provided with an apostrophe. In this embodiment, the resilient arm, now designated 16 ', extends with its free end 31, in the direction of the end of the outer axle body 5' carrying the turret. The root 17 'of the arm is located near the free end 11' of this organ 5 '. As in the first embodiment, the arm 16 'is radially and laterally in a corresponding window 18' in the wall of the sleeve-shaped member 5 'elastically deflected. At this second embodiment, the outer sleeve 6 'has an axially directed slot 53 which is diametrically opposed to the arm 16' and is substantially closed at the level of the nose 23 'and the root of the arm 16' at its ends. The inner axis organ 6 ', on which the outer member 5' in his on the FIGS. 22 to 26 shown second embodiment, has a guide groove 25 'for the nose 23' of the spring arm 16 ', which has substantially the same structural features, as the guide groove 25 of the first embodiment, as the FIGS. 17 to 21 can be seen. However, now is the groove 25 'in the outer half of the organ 6' and has only a small depth, in particular the FIGS. 16, 18 and 21 demonstrate. The central groove portion 27 'extends to the outer end of the member 6', which has at this point an axial projecting tongue 55 having the width of the groove. The Z-shaped closure wall 32 'of the heart-shaped groove 25' is now located approximately in the middle of the length of the organ 6 '. The inner walls of the heart-shaped groove 26 ', on which the nose 23' slides upon actuation of the device, are formed as side walls of an island-like corresponding projection 56.

In the second embodiment, in the wall of the member 6 'of the groove 25' is diametrically opposed, an axially extending radially resiliently deflectable arm 59 cut out, the root of which is from the bottom of serving for receiving the compression spring 7 axial cavity to the inner end of the organ extends. This arm 59 has a projection 60 projecting radially outwardly beyond the peripheral surface of the member, which has a chamfer 61 on its side directed towards the root of the arm 59. This arm 59 with its projection 60 and its chamfer 61 is elastically radially inwardly displaceable when pushing the outer member 5 ', and then engages in the slot 53 of the outer organ 5 ', with the result that the two organs 5' and 6 'remain connected despite the action of the compression spring 7.

The operation of the second embodiment of the invention substantially corresponds to that of the first embodiment and therefore need not be further described in detail. The FIGS. 7 and 20 and 29 show the device in its two end positions. Again FIG. 28 can be seen, now the two axis organs are held together by their assembly that the projection 60 of the arm 59 engages behind the boundary wall of the slot 53 and is blocked in this position. The intervention of the projection in the slot was possible during assembly thanks to the chamfer 61 of the projection. In this second embodiment, the guidance of the nose of the elastic arm is practically only effected by the island-shaped inner wall of the heart-shaped guide track, so that the groove is possibly no longer necessary. In the second embodiment, unlike the first of the resilient arm 17 'is not claimed to train, but to pressure.

The FIGS. 30 to 34 show a variant of the second embodiment, in which the resilient arm is subjected to pressure. The peculiarity of this embodiment is that the nose 23 'of the spring arm 16' when released from its retracted position after renewed pressing of the knob longer than before and is performed relatively gently from its laterally deflected position in its central rest position. For this purpose, the bottom of the heart-shaped slide track is executed mehrebnig and has the nose 23 'of the resilient arm 16' has a small cylindrical radial projection 64 on its end face.

As the figures show, the lateral paraxial groove portions 29 ', 30' in the vicinity 65 of the heart-shaped central elevation 56 'are shallower than in the rest of the groove region, forming an axially parallel step 66 which extends parallel to the axis somewhat beyond the tip and then angled towards the axis.

After the release of the nose 23 'of the resilient arm 16' from its locked position, as a result of a renewed indentation of the knob, the small projection 64 'comes laterally into contact with the step 66 on the face of the nose 23 and slides under the action of the compression spring the axis-parallel region of the step and then the adjoining oblique step portion practically to the central axis of the slide track. Thanks to this "gentle" guidance, the arm is returned to its neutral position too quickly, almost leaping and making noises.

In this embodiment, as before, the massively executed nose 23 'on the mechanical loads, whereas the projection 66 is used for guiding when the nose slides in the axis-parallel groove part and then to the central axis.

The embodiments shown and described only as an example have in common that they are formed only by assembling three components, namely the two rotatably connected to each other, but axially displaceable to each other axis member and the compression spring. The axle parts are advantageously designed as castings and made of plastic. The assembly of the device is extremely simple and requires only the insertion of the compression spring in the outer axis organ and then the axial insertion of the inner organ in the outer organ, the organs then through means integral with the organs are held together against the force of the spring between them.

It should also be noted that the extended leadership in accordance with the FIGS. 30 to 34 can also be provided for the first embodiment.

Claims (8)

1. Retractable turning handle of a switch or positioning device, especially of a household appliance, with a knob which can be set in different angle positions and is movable axially between an external rotation angle adjustment position proud of an outer surface of the appliance and a position recessed in that area, also with a two-piece pivot pin which is joined to the knob so as to be torque-proof and has an inner axially fixed pin member and an outer sleeve-type pin member axially movable on it by means of a connecting link guide, and with a pressure spring arranged between the two pin members to restore the knob to its outer, non-retracted position, the connecting link guide having a guide track on the outer surface of the inner pin member in which a body axially fixed to the outer pin member is guided, so that after an angular adjustment of the knob in its outer position, it is retractable into the outer face and lockable in its retracted position by means of an axially aligned first pressure exerted on it, and the knob can be released again by means of a second axially aligned pressure, so that it can return to its outer position by the action of the pressure spring, said guided body being a lug (23, 23') projecting radially inwards at the end (21, 21') of an arm (16, 16') which is integral with the sleeve-type outer body (5, 5') and runs essentially parallel to its axial direction and is radially and laterally movable from its rest position and is not elastically deformed in either its rest position or its locked position, and said guide track (25, 25') of the connecting link guide has a heart-shaped part (26, 26') whose tip passes into an axially aligned area (27, 27') and whose the two side areas (29, 29'; 30, 30') are joined together at their ends opposite to the tip by a transversely aligned part (45, 45'), the inner wall of which has a recess into which the lug (23, 23') of the movable arm (16, 16') can engage, characterised in that the axially parallel track member (30, 30') of the connecting link guide designed for return to the central rest position of the arm (13, 13') has a guide level (66) in its base which extends beyond said tip to the pin, and that the lug (23, 23') has a protrusion (64) on its end facing the base through which the lug (32, 32') is guided along the guide level (66).
2. Device according to claim 1, characterised in that the guide track (25) is formed by a groove made in the outer surface of the inner pin member and in the connecting groove part (45) opposite to the inner wall (42) there is an outer wall (32) which has guide areas (34, 39) along which the lug (23) can slide from one of the two side groove areas into the engaged position and from it into the other side groove area by the action of the compressive forces exerted on the knob.
3. Device according to claim 2, characterised in that the axially aligned groove area (27) is broken by a cross-web (28) and the lug (23) of the arm (16) is also elastically movable radially outwards, so that when the inner pin member (6) is pushed axially into the outer pin member (5) it can overrun the cross-web (28) and when it is sliding in the axially aligned groove area (27) to the heart-shaped groove part (25), it can overrun the web (28), but not in the opposite direction and can then guarantee the joining of the two pin members (5, 6) against the compression spring (7).
4. Device according to claim 3, characterised in that the free end (21) of the arm (16) is located in the end part of the outer pin member (5) facing the inner pin member (6), and the arm (16) is under compressive stress in its engaged position in the transverse area (25) of the heart-shaped groove part (26).
5. Device according to claim 1, characterised in that said guide track (25') of the connecting link guide has a heart-shaped track part (26') whose tip passes into an axially aligned guide track area (27') and which is essentially defined by a matching elevation of the outer surface of the body (6'), along which the lug (23') slides due to its elastic lateral movement, when the knob is turned, in order to move between its two axial positions.
6. Device according to claim 5, characterised in that the outer pin member (5') has an axially aligned, slotted recess (53), advantageously positioned diametrically opposite to the arm (16'), into which a radially and elastically movable arm (59) of the inner pin member (16') can engage to make the connection between the two pin members (5', 6') against the action of the return spring (7').
7. Device according to either of claims 5 or 6, characterised in that the end (21') of the arm (16') extends to the end of the outer member on which the knob (2') is placed and in that the arm is under compressive stress in its engaged position in the heart-shaped guide track part (26').
8. Device according to any of claims 1 to 7, characterised in that the side faces of the lug (23, 23') on the arm (16, 16') are formed to correspond to the guide track.

Images