EP0494410B1 - Joint for frame profiles - Google Patents

Abstract

Individual frame profiles (1, 21, 27, 30, 34) can be braced against one another to form an exchangeable frame by means of a bistable spring clamping element (9). An exchangeable frame of this type has at least two separation joints (10) which are arranged at opposite points on the frame, each have at least one bistable spring clamping element and thus allow rapid opening or closing of the separation joint (10). For the purpose of guidance, the frame profile has two inwardly directed, plate-type projections (2, 3) which are arranged parallel to the picture plane. The space between these projections (2, 3) serves as a guide space (12) in which a plate-type guide part (6) is arranged movably towards at least one side of the frame. Located in the movable side of the guide part is a connecting link cutout (7) which is designed in terms of shape such that a power accumulator (8) is mounted by one end (23b) so as to be axially rotatable in a counter bearing (19) while the other end (23a) is arranged so as to be displaceable along the path (16) of the connecting link from one of the two power accumulator end positions (15b) to the other (15a) or vice versa, the separation joint (10) being held in the closed position (15a) under a prestress of the power accumulator (8). The power accumulator (8) and frame profile projections (2, 3), connected to one another by a connecting pin (13), together with the guide part (6) and the connecting link cutout (7) arranged therein form the bistable spring clamping element (9). <IMAGE>

Description

The invention relates to a connection for frame profile strips of presentation devices, in particular picture frames or display cabinets, two frame profile strips each being braced against one another at their ends by means of resilient tensioning elements, and wherein the frame profile strips have inwardly projecting legs for holding a plate-shaped object in a plane parallel to the main plane of the frame .

Devices are known for connecting frame profile strips, in particular for interchangeable frames, in which two frame profile strips can be braced against one another at their ends by means of resilient tensioning elements. Such a device has become known from utility model G 81 35 367.7, the tensioning element consisting of a curved leaf spring, the ends of which engage in recesses in the frame profile strips and thus brace the ends of the frame profile strips against one another. When dismantling such a frame, however, any cohesion between the clamping element and the frame profile strips is lost, so that a Reassembling requires some skill and a solid work surface.

In another known interchangeable frame (DE 30 27 258 A1), front-side insertion of images is made possible by the fact that hollow profiles of the miter-cut frame strips have, at least in the region of their two ends, a longitudinal slot facing the center of the frame, that corner connectors have a support part projecting inwards from the corner for the back wall or the image and the like. Form, which is connected via a through the longitudinal slots web with the fully insertable into the abutting at this corner hollow profiles elbow, and that in recesses of the hollow profiles latching retaining cams or the like two each one end - And a spreading position of the frame profile strips are assigned corresponding recesses. In order to keep the removable frame in a closed position, spring tongues are provided which, however, do not clamp the corners of the frame parts together, but only hold them in the pushed-together position.

These disadvantages are avoided with an interchangeable frame already proposed in DE-A-40 10 391, which is not prepublished, in that at least two clamping elements with a slot groove guide form parting lines using an energy store. With this version, correct guidance is guaranteed; The two and more clamping elements per frame cause canting due to the narrow guide groove guide of the sliding body, which complicates the opening and closing of the frame.

Another both economic and technical disadvantage is that the tensioning element is not part of the frame, but is formed from additional components, which are expensive on specially provided holding devices the frame profiles must be connected. Frequent actuation of the tensioning device loosens the connection to the frame profile, so that an exactly closed joint is no longer guaranteed.

Another disadvantage is that flat picture frames cannot be produced due to the complex structure of the tensioning element and the holding device required for this.

The invention has for its object to simplify the exchange of pictures in picture frames and frameless picture carriers, especially in wall-anchored picture frames, which previously had to be dismantled to change the picture.

• a) zwei Vorsprünge der Rahmenprofilleisten bilden einen Führungsraum, in den ein plattenförmiges, gegenüber mindestens einer Rahmenprofilleiste beweglich angeordnetes Führungsteil eingreift;
• b) das Spannelement ist ein bistabiles Federspannelement, das mindestens einen Kraftspeicher aufweist;
• c) das Führungsteil weist mindestens eine geschlossene Kulissenaussparung mit zwei entgegengesetzt liegenden Endstellungen für den Kraftspeicher, einem diese Endstellungen verbindenden Kulissenweg sowie einem im wesentlichen aus einer Nase gebildeten Widerlager auf;
• d) der Kraftspeicher ist derart in der Kulissenaussparung angeordnet, daß das eine Ende des Kraftspeichers im Widerlager gelagert ist und das andere Ende des Kraftspeichers dem Kulissenweg zugeordnet ist, wobei dieses Ende des Kraftspeichers entweder in der einen oder der anderen Endstellung der Kulissenaussparung ruht;
• e) der Kraftspeicher weist an dem dem Kulissenweg zugekehrten Ende einen Verbindungsstift auf, durch den der Kraftspeicher mit den beiden Vorsprüngen der Rahmenprofilleisten verbunden ist;
• f) der Verbindungsstift steht in der Endstellung, in der die Trennfuge zwischen aneinanderstoßenden Rahmenprofilleisten geschlossen ist, unter einer Vorspannung.

According to the invention, the object is achieved by the following measures:

• a) two projections of the frame profile strips form a guide space in which a plate-shaped guide part engages, which is arranged movably relative to at least one frame profile strip;
• b) the tensioning element is a bistable spring tensioning element which has at least one energy store;
• c) the guide part has at least one closed link recess with two opposite end positions for the energy accumulator, a link path connecting these end positions and an abutment essentially formed from a nose;
• d) the energy store is arranged in the link recess such that one end of the energy store is mounted in the abutment and the other end of the energy store is assigned to the link path, this end of the energy store resting either in one or the other end position of the link recess;
• e) the energy store points to the scenery path facing end of a connecting pin through which the energy accumulator is connected to the two projections of the frame profile strips;
• f) the connecting pin is in the end position, in which the joint between adjacent frame profile strips is closed, under a prestress.

The advantages achieved with the invention are that the connection can be released or tensioned without removing or actuating any screws, brackets, brackets, toggle locks or the like.

The connection according to the invention holds the frame profile strips both in the closed position and in an open position and is therefore also called bistable spring tensioning element in the following. The connection according to the invention can be arranged on two or more end joints. With removable frames equipped with the connection according to the invention, an image exchange is possible from the front side without the frame having to be removed from the wall. The same advantage arises with picture showcases or other presentation facilities. The device according to the invention is suitable for round as well as for square frames or showcases with three, four or more corners. The frame profile strips to be connected are preferably, but not exclusively, mitred and consist of extruded aluminum, plastic or wood.

Advantageous further developments and improvements of the invention specified in the main claim are possible through the measures listed in the subclaims.

In the case of an interchangeable frame with two separating joints arranged opposite one another, the process of exchanging images is as follows:
The frame is placed with the back on a flat surface, by pressing on a frame leg towards the outside of the frame, the frame opens at the joints. The image can be exchanged from the front. When the joint is open, the top of the profile projection on top serves as a support surface for the objects to be replaced. The separating joints are closed by pressing the outside of the frame towards the center of the frame. When opening or closing, the pressure initially increases due to the pressurization of the energy accumulator until the energy accumulator snaps into the other end position after a force maximum has been exceeded. At least in the closed position, the parting lines are held under a pretension.

A particular advantage is that the bistable spring tensioning element is part of the frame and consists of components such as profile strip, guide part, energy accumulator and connecting pin - ideally only from the usual components such as the version consisting of frame profile, picture frame rear wall and connecting pin. The guide part, the setting recess and the energy storage are formed by or from the picture frame rear wall according to claim 4 and 6.

Another advantage is that the guide part is a flat angle, which has a closed slot recess at least in one leg side.

In order to firmly anchor picture frames on the wall, it is advantageous if the guide part additionally has a wall fastening device which is designed such that there is a distance between the guide part and the wall exists to ensure the function of the movable frame parts.

A simplification and therefore a particular advantage is if the guide part is formed from the rear frame of the picture frame and has at least two closed setting recesses. The guide part according to claims 2, 3 and 4 can be made of metal, plastic or other materials.

The energy accumulator is a compression spring, which is formed from an arc shape or a combination of arc and spiral shape, the design and arrangement in the setting recess can be seen from claims 5, 6 and 7.

If the compression spring consists of a combination of arc and spiral shape, this increases the size of the energy accumulator with the same dimensioning of the slot recess. In addition, the spiral section enables a kind of axial movement in the abutment, which supports the regulated sequence of the snap movement. With this arrangement, it is possible to store energy and guide part from the same workpiece, for. b. Injection molding plastic.

The execution of the energy accumulator according to claims 5, 6 and 7 can take place in addition to the already mentioned plastic with steel elastic behavior in spring steel strip or spring steel wire.

The backdrop path arranged in the backdrop recess, which represents the connection between the two energy storage end positions, runs in conformity with the opening direction of the parting line. The exact course is apparent from claims 8, 9, 10, 11 and 12.

A particular advantage of frameless picture carriers is that only parts of a profile strip are required for the holding function of the glass pane and picture, as is evident from the claim.

The guide space, which is important for a closing and opening movement parallel to the main plane of the frame, is formed from two profile projections and can be open at the projection ends or closed by a web.

If the bistable spring tensioning element is used for wall brackets, the guide part is a plate-shaped fastening device with a front and rear side recess for receiving the profiled strip section according to claim 16. This design makes the guide part movable to the wall and also, for. B. a mirror back surface guaranteed.

Fig. 1

eine perspektivische Ansicht eines bistabilen Federspannelements mit diagonal geöffneter Trennfuge,

Fig. 2

eine perspektivische Ansicht eines bistabilen Federspannelements mit parallel geöffneter Trennfuge,

Fig. 3

eine perspektivische Ansicht des Führungsteils als Bilderrahmenrückwand ausgebildet,

Fig. 4

die Vorderansicht eines als Flachwinkel ausgebildeten Führungsteils mit einer Kulissenaussparung,

Fig. 5

die Vorderansicht eines als Flachwinkel ausgebildeten Führungsteils mit zwei Kulissenaussparungen und Wandbefestigung,

Fig. 6

die Vorderansicht einer Kulissenaussparung nach den Figuren 1, 4 und 14,

Fig. 7

die Vorderansicht einer Kulissenaussparung nach Fig. 2,

Fig. 8

die Vorderansicht einer Kulissenaussparung mit bogenförmigem Kulissenweg,

Fig. 9

einen teilweisen Querschnitt durch einen Wechselrahmen unter Verwendung eines Flachwinkels als Führungsteil,

Fig. 10

Stirnseite eines Rahmenprofils mit zwei Bildaufnahmekammern,

Fig. 11

die Stirnseite eines Rahmenprofils mit einer Bildaufnahmekammer und einem durch einen Steg geschlossenen Führungsraum,

Fig. 12

die Stirnseite eines Rahmenprofils mit zwei Bildaufnahmekammern und einem durch einen Steg geschlossenen Führungsraum,

Fig. 13

die Stirnseite eines Rahmenprofils aus Holz mit offenem Führungsraum,

Fig. 14

die Vorderansicht eines rechtwinkligen Wechselrahmens nach Fig. 9 mit geöffneten Trennfugen an zwei diagonal gegenüberliegenden Ecken,

Fig. 15

die Vorderansicht eines rechtwinkligen Wechselrahmens mit geöffneten Trennfugen und Wandbefestigungen,

Fig. 16

die Vorderansicht eines rechtwinkligen Wechselrahmens mit zwei geöffneten Trennfugen, bei dem das Führungsteil durch die Bilderrahmenrückwand gebildet wird,

Fig. 17

die Vorderansicht eines Wechselrahmens, bei dem sich an jeder Ecke eine geöffnete Trennfuge befindet und das Führungsteil durch die Bilderrahmenrückwand nach Fig. 3 gebildet wird,

Fig. 18

eine Ecke eines rahmenlosen Bildträgers, die aus einem Teilstück einer Bilderrahmenrückwand nach Fig. 3 und einem Bildhalter aus einem Teilstück des Rahmenprofils nach Fig. 9 besteht,

Fig. 19

eine perspektivische Ansicht eines Bildhalters, der aus einem Teilstück des Rahmenprofils nach Fig. 9 besteht,

Fig. 20

eine perspektivische Ansicht einer Wandbefestigung, die als Führungsteil für den Bildhalter nach Fig. 19 ausgebildet ist,

Fig. 21

die Vorderansicht eines Kraftspeichers mit einem bogenförmigen Teilstück, bei dem die beiden Enden ösenförmig ausgebildet sind,

Fig. 22

die Vorderansicht der Ecke eines Rahmens mit geschlossener Trennfuge und winkligem Führungsteil,

Fig. 23

die Vorderansicht eines Teilstücks des Führungsteils mit der alternativen Form eines Kraftspeichers,

Fig. 24

die Vorderansicht einer Rahmenecke nach Fig. 14 und einliegendem Kraftspeicher nach Fig. 25,

Fig. 25

die vorderansicht eines Führungsteilstücks mit einer weiteren Variante eines Kraftspeichers.

Exemplary embodiments of the invention are shown in the drawing and are explained in more detail below with reference to FIGS. 1 to 25. Show it:

Fig. 1

2 shows a perspective view of a bistable spring tensioning element with a diagonally opened parting line,

Fig. 2

1 shows a perspective view of a bistable spring tensioning element with a joint opened in parallel,

Fig. 3

a perspective view of the guide part formed as a picture frame rear wall,

Fig. 4

the front view of a guide part designed as a flat angle with a slot recess,

Fig. 5

the front view of a guide part designed as a flat angle with two link recesses and wall mounting,

Fig. 6

the front view of a backdrop recess according to Figures 1, 4 and 14,

Fig. 7

the front view of a backdrop recess according to FIG. 2,

Fig. 8

the front view of a backdrop recess with an arcuate backdrop path,

Fig. 9

a partial cross section through an interchangeable frame using a flat angle as a guide part,

Fig. 10

Face of a frame profile with two image recording chambers,

Fig. 11

the end face of a frame profile with an image recording chamber and a guide space closed by a web,

Fig. 12

the end face of a frame profile with two image recording chambers and a guide space closed by a web,

Fig. 13

the front of a wooden frame profile with an open guide space,

Fig. 14

9 the front view of a right-angled interchangeable frame according to FIG. 9 with open parting lines at two diagonally opposite corners,

Fig. 15

the front view of a rectangular interchangeable frame with open parting lines and wall fastenings,

Fig. 16

the front view of a rectangular interchangeable frame with two open parting lines, in which the guide part is formed by the rear wall of the picture frame,

Fig. 17

the front view of a removable frame, in which there is an open parting line at each corner and the guide part is formed by the picture frame rear wall according to FIG. 3,

Fig. 18

3 a corner of a frameless picture carrier, which consists of a section of a picture frame rear wall according to FIG. 3 and an image holder of a section of the frame profile according to FIG. 9,

Fig. 19

9 shows a perspective view of an image holder which consists of a part of the frame profile according to FIG. 9,

Fig. 20

19 shows a perspective view of a wall fastening which is designed as a guide part for the image holder according to FIG. 19,

Fig. 21

the front view of an energy accumulator with an arcuate section, in which the two ends are eye-shaped,

Fig. 22

the front view of the corner of a frame with closed parting line and angled guide part,

Fig. 23

the front view of a section of the guide part with the alternative form of an energy accumulator,

Fig. 24

14 shows the front view of a frame corner according to FIG. 14 and an energy accumulator according to FIG. 25,

Fig. 25

the front view of a guide section with a further variant of an energy accumulator.

1 shows a perspective view of a frame corner which forms a bistable spring tensioning element 9. 4, two frame profile strips 1 are connected to one another, one profile strip being firmly connected to the associated angle leg by means of adhesive, rivets or compression, while the other angle leg is part of a bistable spring tensioning element 9 . A parting line 10 is open in the diagonal direction and has a parallel guide to the main plane, also called the image plane. An energy store 8 according to FIG. 21 is located in the slot recess 7. A connecting pin 13 is also shown.

FIG. 2 shows a frame corner which forms a bistable spring tensioning element 9, which represents a variant of FIG. 1. It is formed from the profile strip 27 and a flat angle with one-sided link recess according to FIG. 7. The parting line 10 has a parallel opening in the movable frame strip.

The picture frame rear wall as a guide part 6 is shown in FIG. 3. The scenery path 16 runs according to claim 11. Fig. 17 shows the front view of such a frame with four open parting lines 10.

The flat angle as the guide part 6 in FIG. 5 shows a device for the wall fastening 14, which is provided with a bore 26. The two legs of the flat angle each have a link recess 7, in which the link path 16 runs diagonally to the movable frame strips.

Fig. 6 shows a backdrop recess 7, the backdrop path 16 installed in the frame has a diagonal course to the movable frame strips. Only in the closed position 15a is the energy store 8 in a locking section, the section 17, which has a parallel profile to the horizontal frame strips. This configuration of the setting recess 7 ensures that the closed frame corner does not open by itself due to the weight of the plate-shaped object 4 or other vertical tensile forces.

In FIG. 7, the sliding path 16 shows, installed in the frame, a parallel guide to the movable frame strips, as can be seen from FIG. 2.

Due to the extent of the curvature of the link path 16 in FIG. 8, fine tuning of the energy accumulator 8 and the link recess 7 is possible. Thus, the pressure spring can be selected so that a maximum of preload in the closed position is opposed to a minimum of effort in the displacement movement. This makes it possible to keep frame corners closed under load even without the locking section 17 shown in FIG. 6.

The slide path 16 shown in FIGS. 6, 7 and 8 can be arranged in the frame in all angular degrees depending on the arrangement of the parting line 10. The setting recess 7 is then aligned so that the setting path 16 points in the desired opening direction of the parting line.

The energy store 8 according to FIGS. 21, 23 and 25 and the slot recess according to FIGS. 6, 7 and 8 represent the core of the bistable spring tensioning element 9.

An energy store, inserted into the link recess, with end 23a seated in one of the two end positions 15a or 15b and the other end 23b or 25 in an abutment 19 formed from a nose (18) is guided along end path 16 when end 23a is moved and is put under pressure by reducing the distance to the abutment 19. After exceeding the minimum distance, end 23a then snaps into the other end point.

9 shows a cross section through the frame profile 1. Between the two frame projections 2 and 3, the guide space 12, there is the guide part 6. The plate-shaped object 4 can also consist of a glass pane, picture and possibly also a picture frame rear wall and is located between the profile projections 2 and 5. Therefore this space is also called Denoted image chamber 20.

The frame profile 21 in FIG. 10 has two picture chambers 20, the glass pane being in the front and the picture with the picture frame rear wall in the rear. With this arrangement, plastic pictures or flat exhibition objects, such as. B. coins or the like are presented.

11 has the frame profile 27 with a closed guide space 12. The two profile projections 2 and 3 are connected at the end by the web 22. For this frame profile, the setting recess 7 according to FIG. 7 is used, in which the setting path 16 is parallel to the movable frame strip according to FIG. 2.

12 shows a variant of a frame profile with a closed guide space 12 and two image chambers 20.

In the embodiment according to FIG. 13, a frame profile 30 made of wood is shown with a bar (34). The profile projection 5 is provided with a semicircular profile.

The exemplary embodiments according to FIGS. 14 to 16 show frames with two diagonally arranged parting lines 10, which are in an open state. The outside of the frame bar is identified by reference number 36.

FIG. 17 shows a frame with four opened parting lines 10. The opening direction is at right angles to the movable frame strips. The guide part 6 is formed by the picture frame rear wall according to FIG. 3.

In the embodiment according to FIG. 18, a section of a profile strip 1, which is designed according to FIG. 19, is located in a parallel opening to the picture frame rear wall, which functions as a guide part 6. The link path 16 has a right angle to the outer edge 32 of the guide part.

20 shows a wall fastening which is designed as a guide part 6 and has a recess 33 which is provided for receiving the holder. 19 consists of a section of the frame profile 1 and is connected by means of a connecting pin 13 to the wall fastening. The wall attachment is made by the hole 35 fastened to the wall by means of screws.

According to FIG. 21, the energy accumulator 8 is a compression spring with two eyelet-shaped ends 23a and 23b and an arc-shaped central part 24. When the energy accumulator is pressurized, the central part 24 bends more and thereby absorbs forces which, after exceeding the maximum force, return to the predetermined preload to be led back.

FIGS. 22 and 24 show frame corners with closed parting lines 10 and two alternative energy stores 8.

The alternative embodiment according to FIG. 23 shows an energy accumulator 8, which consists of the same workpiece as the guide part 6, which protrudes spirally 25 from the abutment 19 and which swivels at the end of the abutment 19 into an oppositely arranged arc shape 24, in order finally to be in one Eyelet shape 23a to end.

25 is identical to the embodiment in FIG. 23 except for the connection to the abutment 19. Instead of the connection to the guide part 6, the energy store 8 has an extension 29 which is located in a groove 31 in the abutment 19 has its seat.

Claims (18)

1. A device for joining molded fillets for constructing frames of presentation facilities, in particular of picture frames and display cabinets, wherein two molded fillets each can be forced together by means of spring loaded tensioning elements thus forming a butted joint and wherein the molded fillets exhibit wings protruding towards the inside for holding a panel-shaped object in a plane in parallel to the principal plane of the frame, characterized in that

   a) two profile wings (2, 3) of the molded fillets (1, 21, 27, 30, 34) form a guiding groove (12) into which a panel-shaped guiding piece (6) engages which is mobile with respect to at least one molded fillet;

   b) the tensioning element is a bistable spring-loaded tensioning element (9) having at least one energy store (8);

   c) the guiding piece (6) exhibits at least one closed coulisse recess (7) with two opposed final positions (15a, 15b) for the energy store (8), one sliding path (16) interconnecting these final positions, and an abutment (19) which is essentially formed by a lug (18);

   d) the energy store (8) is arranged in the coulisse recess (7) so that the one end (23b, 25) of the energy store (8) is pivoted in the abutment (19), whereas the other end (23a) of the energy store (8) is associated with the sliding path (16), this end (23a) of the energy store (8) resting either in the one (15a) or the other final position (15b) of the coulisse recess (7);

   e) the end (23a) of the energy store (8) which faces the sliding path (16) has a connecting pin (13) which connects the energy store (8) with the two profile wings (2, 3) of the molded fillets (1, 21, 27, 30, 34);

   f) in the final position (15a), where the joint (10) separating the abutting molded fillets (1, 21, 27, 30, 34) is closed, the connecting pin (13) is exposed to a pretension.
2. A device as claimed in claim 1, characterized in that said guiding piece (6) is a flat angle bracket which has a closed coulisse recess (7) in at least one angle side.
3. A device as claimed in claim 1, characterized in that said guiding piece (6) in addition has a wall mounting device (14).
4. A device as claimed in claim 1, characterized in that said guiding piece (6) is established by the picture frame rear panel and has at least two closed coulisse recesses (7).
5. A device as claimed in claim 1, characterized in that said energy store (8) is a compression spring which has a curved shape (24) and whose ends (23a, 23b) both have the shape of an O-ring.
6. A device as claimed in claim 1, characterized in that said energy store (8) is a compression spring which comprises a curvilinear section (24) with an O-ring shaped end (23a) and a spiral-shaped section (25) arranged in opposite direction with respect to the curvilinear shape and subsequent to the latter, and whose end is fixed to said abutment (19).
7. A device as claimed in claim 1, characterized in that said energy store (8) is a compression spring which comprises a curvilinear section (24) with an O-ring shaped end (23a) and a spiral-shaped section (25) arranged in opposite direction with respect to the curvilinear shape and subsequent to the latter, and whose end has a projecting tongue (29) which engages in a groove (31) within said abutment (19).
8. A device as claimed in claim 1, characterized in that said sliding path (16) takes an oblique route with respect to the outside (36) of the associated molded fillet.
9. A device as claimed in claim 8, characterized in that said sliding path (16) exhibits a track section (17) which takes a parallel route with respect to the outside (36) of the horizontal molded fillets, when the joint (10) separating the abutting molded fillets is closed.
10. A device as claimed in claim 1, characterized in that said sliding path (16) takes a parallel route with respect to the outside (36) of the associated molded fillet.
11. A device as claimed in claim 1, characterized in that said sliding path (16) takes an orthogonal route with respect to the outside (36) of the associated molded fillet.
12. A device as claimed in claim 1, characterized in that said sliding path (16) takes a curvilinear route, the two final positions (15a, 15b) of the energy store with respect to their mutual positions being arranged in an oblique manner with respect to the outside (36) of the associated molded fillet.
13. A device as claimed in claim 1, characterized in that said abutment (19) in the coulisse recess (7) exhibits a groove (31).
14. A device as claimed in claim 1, characterized in that said guiding space (12) formed by the two profile wings (2, 3) is open on the frame inside.
15. A device as claimed in claim 1, characterized in that said guiding space (12) formed by the two profile wings (2, 3) is closed by an interconnecting web (22) on the frame inside.
16. A device as claimed in claim 1, characterized in that a prism-shaped guiding piece (6) has a guiding groove (33) at its front and rear sides and a bore (35) at one of its ends.
17. A device as claimed in claim 1, characterized in that said abutment (19) is realized by said lug (18) which embraces the end (23b, 25) of the energy store so that an opening between said abutment (19) and the remaining coulisse recess is defined just wide enough to allow for the axial movement which occurs when the energy store (8) is shifted in said abutment (19).
18. A device as claimed in claim 1, characterized in that said abutment (19) in the coulisse recess (7) is arranged so that its distance to the two final positions (15a, 15b) of the energy store is greater than its distance to the sliding path (16) which interconnects these two final positions.

Images