DE2707697A1 - DEVICE FOR HOLDING AND PRESSING A SECTION OF A DECORATIVE STRIP OR DGL. IN ONE FORM - Google Patents

Description

PATENT Attorney DIPL.-ING. GERD UTERMANN

71 HEILBRONN. PO Box 3525. CABLE: PATU. TEL. (07131) 82828

MohkestraBe 6 ( hat of the Deutsche Bank). Parking: Underground car park Harmonie Deutsche Bank Hellbronn: 364364 Handelsbank Heltbronn: 23080 5 Kreissparkasse Hedbronn: 7001 6 Postscheck Stuttgart: 43016-704

Patent and utility model help E 8. 32 D Ί

Notification H.99 ¹ IO to cas 19

February 22, 1977 / 5C

Societe anonyme dite:
Applicant: ETUDE ET REALIZATION DE

CHAINES AUTOMATIQUES (E.R.C.A.)

Avenue du Pacifique

Zone Industrielle de Courtaboeuf

P-91402 ORSAY (Essonne) France

Description: Device for holding and pressing a section of a decorative strip or the like in a mold

Description:

The invention relates to a device for holding and pressing a section of a decorative strip or the like. in a thermo-forming device for pots made of thermoplastic material, with a form that has one interposed a support rod and a mold housing has a base plate mounted on a stand, and with a mold chamber, which is open at its two ends lying one above the other and is delimited by the shape on its sides and relative to the bottom plate between an upper mold position in which the bottom plate is the bottom opening of the molding chamber closes and a lower evacuation position, in

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which is at least the underside of the base plate above the upper opening of the molding chamber, is vertically movable, and with at least one rolling housing, which has at least one cylinder-like cavity called a rolling space, the has a smaller transverse cross section than the smallest transverse cross section of the Pormkammer, and the has at least one opening, the cross-section of which corresponds to the transverse Cross-section and which »is accessible from the side via an access recess that extends parallel extends to the axis of the rolling cavity and in the rolling housing or an element which laterally part of the Cavity is limited and mounted on the rolling cage, is provided, and with one in the rolling cavity with only insignificant lateral play arranged transfer piston, which is suitable, the section of the decorative strip in to push the molding chamber in front of you when this and the rolling cavity are in alignment and approaching each other to have.

In such a device, for example from DT-GM 19 69 3O6 or the French patent application 20 3 ^ 915 is known, it is not possible to use the decorative strip section to support against the parts of the wall of the mold which are very strongly rounded, d. that is, a very small one Have radius of curvature.

The invention is based on the object of proposing devices by means of which this disadvantage can be remedied and which are of simple construction.

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According to the invention this goal is achieved in that the Porm housing is attached to the roller body in such a way that that the molding chamber and the rolling cavity are flush with each other and are in communication with each other as soon as the molding leaves its shape, and the base plate at least opposite the wall areas with a very small radius of curvature has a transverse cross-section with a curve shape that corresponds to the curve shape of the side wall analogously, however, is set back from the side wall of the molding chamber by at least one thickness of the decor strip section corresponding distance, but the distance is less than a maximum of six times this Thickness, and the wall of the molding chamber at the level of the bottom opening has a plurality of retaining projections which arranged between the wall areas with a small radius of curvature are, and the projections have upper surfaces which are movable in the same plane as the occupies the upper surface of the bottom plate in the upper position of the mold housing. Furthermore, projections are provided, the inner edge of which is aligned with the inner wall of the rolling cavity or slightly receding from this interior is arranged. The base plate has lateral circumference in the area of the retaining projections Recesses into which the retaining projections can engage in the upper position of the molded housing. Furthermore, the transfer piston is attached to the base plate in a stationary manner with the interposition of the support rod, and the displacement of the transfer piston on the support rod is provided so that in the lower position of the Mold chamber its top surface at least flush with the top surface of the retaining projections or slightly protrudes above, and that in the lower position of the molding chamber, the upper surface is in the lower region

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of the rolling cavity is located. Finally, the device Holding devices by means of which the decorative strip section is held in place, which was given to him during the upward movement of the molded housing from the base plate.

It is thus achieved in an advantageous manner that the base plate is used for the decorative strip section bring it up to the wall areas with a small radius of curvature during the upward movement of the Pormgehäuses. Of the Decorative strip section can be held evenly in this position. Under the action of the holding devices this position is maintained until the decorative strip section is overmolded on its free rear side takes place, to us in the form of a pot or a container, which is made with the known technology of the thermoforming process is made from a thermoplastic strip or tape.

The holding devices advantageously have at least one porous suction zone, which in "at least one of the side walls of the molding chamber is provided and can be connected to a vacuum space. This arrangement enables it, the decorative strip section as long as in its preformed position against the inner wall of the molding chamber to hold until the overmolding or removal takes place with a container produced in a thermo-forming process, and although in the prescribed position in which the decorative strip section has been brought at least partially through the side wall of the base plate.

If the energy costs associated with the evacuation device in the suction zone are to be saved, it is also possible to use the base plate as a holding device.

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In this case, the base plate becomes elastic on the stand mounted so that a small vertical lifting movement is possible relative to the stand and the mold housing. The . Holding devices also have end stops for the lifting movement, which the lifting movement of the base plate limit, preferably to a length which is smaller than the thickness of the base plate.

As a result of this measure, the base plate is still in the lower area of the mold chamber when the mold housing has already reached its upper position. Thus, the already adapted decorative strip is at its lower end on the one hand through the inner walls of the molding chamber and on the other hand through at least part of the side wall limited to the base plate. The thermoforming process of the container can now begin. During the thermoforming process, is then the decorative strip starting from its upper end against the walls of the molding chamber in the course of Thermoforming process supported by the thermoplastic container molding. Only in the final stage of the molding process, in which the decorative strip has already assumed its fixed position, the base plate becomes like a piston pushed back onto their seat in the molded housing, under the action of the inside of the thermo-molded process formed container existing pneumatic pressure.

For the elastic attachment of the base plate on the stationary stand, the holding devices have a return spring on, which acts between the base plate and the stand in the sense of increasing the distance. Furthermore is a End stop provided for the stroke path, which is fixedly attached, connected to the stand and arranged in such a way that it can interact with a counter-end stop that is fixed to the base plate or a stationary one with the base plate connected element is connected.

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It can advantageously be provided that the return spring is arranged in a guide sleeve fixedly connected to the stand and around the support rod, and that the support rod is firmly connected to the base plate and is easily movable relative to the stand, and the spring on the one hand is arranged between the stand or the guide and, on the other hand, an end stop permanently connected to the rod, and the end stop preferably also plays the role of a counter stop plays, which interacts with the stroke end stop firmly connected to the guide rod.

In certain cases, however, it can also be advantageous if the return spring on the one hand on the base plate or on a fixed element and on the other hand on part of the support rod, preferably the upper end the support rod, which is firmly connected to the stand, while the bottom plate is supported relative to the support rod is movable and guided along this, and a stroke end stop is firmly connected to the support rod, and the Base plate or an element firmly connected to this has a counter-end stop, which with the mentioned Stroke end stop cooperates.

The element firmly connected to the base plate is designed as a guide element, which at least partially a region, preferably the end region of the support rod.

The bottom plate has a spacer on its underside which extends from the side edge of the bottom plate tapers towards the bottom.

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27G7697

The spacer can be designed in the form of a conical section or in the form of a pyramid.

The guide element and the spacer of the base plate can be designed to be firmly connected to one another.

The lower end of the spacer is preferably formed by the circumference of the guide element.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawings.

Show it:

Fig. 1 A side view of a device for holding and pressing a decorative strip in Sectional view along the line I-I in FIG. 2, with the molded body in its upper position is shown;

FIG. 2 shows a plan view of a sectional illustration along the line II-II in FIG. 1; FIG.

FIG. 3 shows a side view in a sectional illustration corresponding to FIG. 1, but with the molded body is shown in its lowest position, in a sectional view accordingly the line III-III in Fig. 4;

FIG. K shows a section along the line IV-IV in FIG. 3;

FIG. 5 shows a plan view of the device according to FIG. 1 and Fig. 3j

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Pig. 6 is a partial sectional view of a specific detail of the device according to the invention; and

7 shows a side view of a particular detail of the device according to the invention in an axial one vertical sectional view.

The device 1 for holding and pressing a section of a decorative strip or the like in a mold 3 is schematic shown in the drawing. To simplify the illustration and facilitate understanding of the present invention only a copy of the device and the mold 3 is shown in the drawing. Of course, however, a Series of devices arranged in parallel for holding and pressing a decorative strip can be used. the Mold 3 forms part of a molding device of a thermoforming device for the production of a pot or container made of thermoplastic material. The structure and the mode of operation such thermoforming devices are generally known, so that a detailed description unnecessary.

In this case, a mold 3 is used, which has a mounted on a stand 6 with the interposition of a support rod 5 bottom plate ¹ I and a molded housing 7 comprising a molding chamber 8, the one above the other at their ends open and at their vertical walls 9 of the mold casing 7 is limited. The molded housing 7 is relative to the base plate ¹ I between an upper position, which is referred to as the molding position (see. Fig. 1), and a lower position, which as. Evacuation position (see. Fig. 3) is referred to, vertical

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movably attached. In the upper position, the base plate 4 closes the opening at the bottom of the molding chamber 8. In the lower position, at least the upper side of the base plate 4 is located above the upper opening the molding chamber 8 (see. Fig. 3).

The device 1 for holding and pressing a decorative strip has in a roll housing 10 on the one hand at least one approximately cylindrical cavity, which is referred to as roll cavity 11 and whose cross section is smaller than the transverse section through the molding chamber 8, and the at least one arranged at the highest point , the cross section of the roller housing corresponding upper opening lla. In addition, the rolling cavity 11 is laterally accessible via an access recess 12 which extends parallel to the axis of the rolling cavity 11 and which is provided either in the rolling housing 10 or in an element 13 which laterally delimits a part of the cavity 11 and is attached to the rolling housing 10. The element having the access recess 12 can be designed as a movable knife 13, which is mounted on the roller housing 10 such that it can move back and forth and can be moved perpendicular to the access recess 12. The movable knife 13 can be assigned to a fixed knife I ¹ I which is arranged in the roller housing 10. In the context of the present invention, however, it is important that knives 13 and 14 are used which end in a part of the rolling cavity 11 on one of their sides. Of course, other cutting devices, for example arranged outside the rolling cavity 11, can also be used. Transport devices can also be provided which ensure the introduction of a decorative strip 2 into the rolling cavity 11. The device 1 for holding and pressing also has a transfer piston 15 which is arranged with only insignificant lateral play in the rolling cavity 11 and which serves to push the decorative strip 2 in the direction of the molding chamber 8 in front of it.

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As can be seen in particular from Figures 1, 2 and 7, the molded housing 7 is attached to the roller housing 10 in such a way that that the molding chamber 8 and the rolling cavity 11 are aligned with each other and are in communication with each other as soon as the bottom plate 4 is not pressed against the seat assigned to it, which is at the lower end of the molding chamber is provided on the molded housing 7.

The connection between the mold chamber 8 and the rolling cavity 11 is therefore present in practically all the positions of the mold housing 7 which do not correspond to the upper position (see FIG. 1). In the embodiment shown in the drawings, the side walls 16 delimiting the molding chamber 8 are arranged at least approximately vertically and perpendicularly to one another. In the connection zone of two side walls 16 of the molding chamber 8 there is a connection area of the wall 17, the radius of curvature of which is very small. At least over the connecting regions 17 with a low radius of curvature, the plate ¹ I, which corresponds to a Transversalabschnitt with an analogue curve shape, but which is arranged set back with respect to the side wall 16, 17 of the molding chamber 8 by a distance of at least the thickness of the decorative band portion, but is less than at most six times this thickness.

As can be seen in particular from FIGS 5 and 7, the side walls 16 of the molding chamber 8 at the level of the Bottom opening of the mold chamber 8 several retaining projections which are provided between the wall connection areas 17 with a small radius of curvature, and the surface thereof is suitable in each case to be brought into the same plane as that of the top of the base plate 4, when the molded housing 7 assumes its upper position.

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The inner edge of the retaining projections 18, that is to say the edge facing the axis of the molding chamber, is either flush with the inner wall of the rolling cavity 11 or is designed to be slightly recessed outward with respect to this inner wall. The base plate Ί has in the area of the retaining projections 18 on its circumference lateral recesses 19 which mesh with the retaining projections 18 when the molded housing is in its upper position. In other words, the retaining projections 18 then protrude into the lateral recesses of the base plate k when the latter closes the base of the molding chamber 8. The transfer piston 15 is attached to the stand 6 by means of the support rod 5. For this purpose, the support rod 5 has a mounting neck 20. The position of the transfer piston 15 on the support rod 5 is selected such that the upper side of the piston 15 in the lower position of the molded housing 7 (FIG. 3) is at least in the same line or slightly above the upper side of the retaining projections 18 (see FIG. 3). is, and that the top of the piston 15 is in the upper position of the mold housing 7 in the lower part of the rolling cavity 11 (Fig. 1).

It should also be noted that the decorative tape section in the embodiment shown in the drawings is cut from a decorative tape 21, which is kept in the form of a roll in stock, and which the roll cavity 11 is fed with the aid of a pair of infeed rollers 22, for example. The rollers 22 are stationary a support 23 is attached, which is connected to the stand 6. The rollers are at the level of the access recesses 12, when the molded housing assumes its upper position. In this context it should be noted that the use of the introductory roles 22 is not relevant to the present invention.

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The device for holding and pressing a decorative tape section also has holding devices 2 ^ which make it possible to hold the decorative tape section 2 in the preformed or adapted position in the molding chamber 8, namely in a position which corresponds to that which corresponds to the decorative tape section during the Raising the molded housing through at least certain areas of the side wall of the base plate ¹ I was abandoned. To achieve an adapted position of the decorative tape section 2 in the molding chamber 8, angled parts are used, that is, those parts which are located at the corners of the base plate Jj, namely the most protruding parts. It is these parts that have to press the decorative tape section in the direction of the connecting areas 17 of the molding chamber 8.

As can be seen from the drawing, a decorative tape section 2 is then inserted into the rolling cavity 17 when the Molded housing 7 occupies its upper position. The decorative tape section 2 therefore wraps around itself (see Fig. 2) and, due to its own elasticity, fits more or less closely to the roughly cylindrical shape of the rolling cavity at. During the downward movement of the mold housing 7 in the lower position (Fig. 3), the transfer piston 15 prevents the Decorative tape section 2 to stay in the rolling cavity 11, in such a way that the decor cut from 2 of the molding chamber is covered and relaxes under the effect of the inherent elasticity .and expands to the side, where he pushes the piston leaves and immediately rests on the retaining projections 18.

During the subsequent upward movement of the mold housing 7, the decorative strip section 2 rests on the retaining projections 18 and is pressed with the side wall of the base plate 4 against the inner walls 16 and in particular against the walls of the connecting areas 17 of the mold chamber 8. The holding means 2 ¹ J hold the decorative section 2 in the position so shaped until it is overmolded or molded with the containers made of thermoplastic material.

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To keep the decorative tape section 2 in its shaped position on the inner walls 16, 17 of the molding chamber 8 hold until overmolding or demolding with an appropriate Thermoforming container is finished, at least one porous suction zone can serve as holding device 24. at In the embodiment shown in the drawings, two porous suction zones 24 are provided which extend over extend the entire height of the Pormkammer 8 and on both sides of a part of the connecting area of the wall are arranged against which the two ends of the decorative tape section 2 apply. It is of course also possible to arrange the suction zones 24 at other locations, in particular in the vicinity of other connecting parts 17 of the walls or on or in these. These porous suction zones can be used jointly or selectively with a vacuum source (not shown) get connected.

To facilitate the installation of the decorative tape section 2 against the side walls 16 and 17 of the molding chamber 8 is on the inside of the bottom plate 4, a spacer 25 is provided, which, starting from the side edge of the Base plate 4, tapered towards the bottom. In this case, the side recesses 19 are extended downwards and also partly arranged in the upper region of the spacer 25. According to the design of the The circumference of the base plate 4 is the spacer 25 in the form of a conical truncated or pyramid-shaped or designed in the form of a truncated pyramid, the smaller surface of the support rod 5 facing. When the spacer is designed in the form of a pyramid or in the form of a truncated pyramid, is the connecting zone between the two Rounded side surfaces.

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Instead of the porous suction zones, the base plate 4 can be used as a holding device, which is used for this Purpose some additional elements are assigned, which are described below.

In order to ensure that the base plate ¹ J has a vertical mobility of a very limited stroke length, for example in the order of magnitude of the thickness of the base plate, the support rod 5 can be attached to the stand 6 according to a first embodiment with the interposition of a return spring 26, which the support rod and which is supported on the one hand on an annular projection 27 of the support rod 5 and on the other hand on the edges of a guide opening 28 provided in the stand 6. Thus, the support rod 5, and thus the bottom plate ¹ I firmly connected thereto is pressed in terms of a distance from the upright 6 to the top. The lifting height of the support rod and the base plate 4 is limited by an end stop 29 which interacts with the annular projection 27 and which acts as a counter-stop. The end stop is designed in one piece with a sleeve-shaped rod guide 30, the upper part of which closely surrounds the support rod 5 and, in cooperation with the guide opening, serves to guide the rod 5. The fastening takes place, for example, on the stand 6 by means of screws 31 attached to the lower end.

Instead of a resilient fastening the bottom plate on the zugeordnetaT stator 6 by means of the arrangement shown in Fig. 6, may also be provided that the base plate H is resiliently mounted at the upper end of the support rod 5. For this purpose, the holding means or preservation devices 2 ¹ J at the upper end of the support rod 5,

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which is no longer firmly connected to the base plate 4, an end face recess 32 which is provided coaxially in the upper end of the support rod 5 starting from the outermost upper end face. The upper end of the support rod 5 also has an annular shoulder 33 serving as an end stop. The support rod 5 is surrounded below the annular shoulder 33 by a guide element 34 which is firmly connected to the base plate. This has an annular counter-stop 35 which serves to interact with the end stop in order to limit the lifting height of the base plate in relation to the support rod 5, and which preferably forms the lower part of the spacer 25 with its circumference. The spacer 25 has in its upper part a blind hole J> 6 running coaxially to the support rod 5, in which the annular shoulder 23 of the support rod 5 engages with only insignificant lateral play and the bottom of the end face recess of the support rod 5 is formed, the return spring 26 is arranged, which tends to move the base plate 4 towards the upper end of the support rod 5. When the molded housing has assumed its upper position, as shown in FIGS. 1 and 7, the base plate 4 is not yet resting on the seat 37, but is still held in the lower end of the molding chamber 8. Under these conditions, the decorative tape section 2, which is located in the molding chamber and rests on edge on the retaining projections 18, with a certain lateral play in the lower end zones between the side wall 16 of the molding chamber 8 and the side surface of the base plate 4 (see left side 7) detected. In this way, the decorative tape section 2 is held in its shaped position which was previously given to it by the side surface of the base plate 4 during the rising of the mold housing 7. In this position, the thermoforming process of a container made of thermoplastic material begins from the back of the decorative tape

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Section 2 in the molding chamber 8. At the beginning of the thermo-molding process of the container, the blank of this container presses the decorative tape section against the side walls the molding chamber 8, starting from the upper end of the decorative tape section. It arises from this process in the molding chamber, an overpressure between the bottom of the container to be molded and the bottom plate Ί, which is on The end of the thermoforming process is finally pressed against the seat, either under the action of Overpressure alone, or under the combined effect of the overpressure and the pressure that occurs in the course of the Forming process is exercised from the container bottom.

At the end of the molding process, the base plate 4 thus assumes the position shown on the right-hand side of FIG. 7, in which its surface is completely flush with the surface of the retaining projections 18. As a result of this assignment, it is not necessary to provide porous suction zones in the side walls of the molding chamber 8, since the base plate h itself keeps the decorative tape section in the intended position until the thermoforming process of the container, which takes place by molding the decorative tape section 2, is completed.

The invention is of course not limited to the exemplary embodiments described above, on the contrary, a number of further embodiments can be provided within the scope of the present invention be.

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Claims (12)

PATENT Attorney DIPL.-ING. GERD UTERMANN 71 HEILBRONN. POST BOX 3S2S. CABLE: PATU. TEL. (07131) 82828 Uoltk.Mr.a. β (skin dar Oautufcwi Bank). Park · »: underground car park Harmoiü · German Bank Hellbronn: 364364 Handelsbank Hellbronn: 23080 S Kreissparkass Hcllbrorm: 700! β Post check Stuttgart: 43018-704 Patent and utility model auxiliary application E 8. 32 D H.9940 to cas February 22, 1977 / 15C Applicant: Societe anonyme dite: ETUDE ET REALIZATION DE CHAINES AUTOMATIQUES (E.R.C.A.) Avenue du Pacifique Zone Industrielle de Courtaboeuf F-91102 ORSAY (Essonne) France Description: Device for holding and pressing a section of a decorative strip or the like in a mold Expectations: Device for holding and pressing a section of a decorative tape or the like in a thermoforming device for pots made of thermoplastic material, with a one with the interposition of a support rod and a molded case having a base plate mounted on a stand and a molded case Shape, with a chamber open at the two ends arranged one above the other, through the side walls the mold is limited and movable relative to the base plate, namely between an upper mold position, in which the bottom plate closes the bottom opening of the molding chamber, and a lower evacuation position in which at least the top of the base plate is located above the upper opening of the molding chamber, and with one ./2 709834/0769 E 8. 32 D H H.99 ¹ IO to cas 19 22.2.77 / 15C Rolling housing, which has at least one rolling cavity with a cross-section that is smaller is as the smallest transverse cross-section of the molding chamber, and the at least one end opening with one has the transverse cross-section corresponding cross-section, and the one laterally is accessible through an access recess extending parallel to the axis of the rolling cavity, which in the roller housing or in a laterally adjoining part of the cavity and on the roller housing attached element is provided, and with a transfer piston, which under only insignificant Play is arranged in the rolling cavity and is suitable for pushing the decorative tape section in front of you in the molding chamber, when this and the rolling cavity are in alignment with each other and have approached each other, characterized in that the Mold housing (7) is mounted on the roller body (10) in such a way that the molding chamber (8) and the rolling cavity (11) are aligned and connected as soon as the molded housing (7) leaves its molded position, and the base plate (4) at least in the one opposite the wall areas with a small radius of curvature Area has a cross section with a correspondingly arcuate course, which, however, opposite the side wall the molding chamber (8) springs back by a distance which corresponds at least to the thickness of the decorative tape section (2), which, however, is less than at most six times this thickness, and the wall of the molding chamber (8) has a plurality of retaining projections (18) at the level of the bottom opening, which between the wall areas with little Radius of curvature are arranged, and each have surfaces which can be brought into the same plane, • / 3 709834/0789 ε 8. 32 D η H.9940 to cas 19
22.2.77 / 15E which occupies the top of the base plate (4) at the upper position of the mold casing (7), and which are arranged j jumping either flush with the inner wall of the roll cavity or against the inner wall of the roll cavity slightly back and that in the region of the retaining projections ( 18) in the circumference of the base plate (4) lateral recesses (19) are provided, in which the projections (18) can enclose in the upper position of the molded housing (7), and that the transfer piston (15) with the interposition of the support rod (5 ) the base plate (4) is mounted on the stand (6), and the transfer piston is arranged displaceably on the support rod such that in the lower position of the mold housing (7) the upper piston surface is at least flush with the upper surface of the retaining projections (18) or slightly above, and that in the lower layer of the mold, the upper surface is in the area below the rolling cavity, and the device is moreover has holding devices (24) by means of which the decorative tape section (2) can be held in the position that was given to it by the base plate (4) during the movement of the mold housing (7) directed upwards again. ./4 709834/0789 E 8. 32 D 4 H. 99 ^ 0 to Cas 19 February 16, 1977 / 5E 2. Apparatus according to claim 1, characterized in that the holding devices (2 ¹ J) have at least one porous suction zone which is provided in at least one of the side walls of the molding chamber (8) and can be connected to a vacuum chamber. 3. Apparatus according to claim 1, characterized in that the base plate (4) forms part of the holding devices (2 ¹ I) and is so elastically arranged on the stand that a small vertical lifting movement with respect to the stand (6) and the molded housing (7) is possible, and the holding devices (2 ¹ I) also have end stops (29) which limit the stroke of the base plate (4). 4. Device according to one of claims 1 or 3, characterized in that the d Stroke of the base plate (4) is smaller than the thickness of the base plate. 5. Device according to one of claims 1, 3 and / or 4, characterized in that the holding devices (24) have a return spring (26), which acts on the base plate (4) in the sense of a distance from the stand (6), and an end stop (29) is provided, which is arranged in a stationary manner and is connected to the stand (6), in such a way that it can interact with an annular counterstop on the base plate (4) or with an element fixedly connected to it. • / 5 709834/0769 E 8. 32 D H H. 99 ^ 0 to cas 19 22.2.77 / lC 6. Device according to one of claims 1 to 5, characterized in that the return spring (26) is arranged around the support rod (5) in a rod guide firmly connected to the stand, and the support rod is connected to the base plate ( ¹ J) and is arranged to be easily movable relative to the stand (6), and the spring (26) is arranged on the one hand between the stand (6) or the guide and on the other hand an annular shoulder (33) firmly connected to the rod, and the stop shoulder is preferably the roller forms a counter-stop which cooperates with the end stop that is firmly connected to the guide rod. 7. Device according to one of claims 1-5 »characterized in that the return spring (26) with one end on the base plate or a firmly connected element and with the other end on a part of the support rod, preferably the upper end of the fixed with the stand connected to which the support rod is supported, while the base plate (4) is movably attached relative to the support rod and is arranged to be movable along it, and a stop for limiting the lifting length is firmly connected to the support rod (5), and the base plate ( k and an element firmly connected to this have the counter-stop, which cooperates with the stroke end stop. 8. Device according to one of claims 1-7, characterized in that the element firmly connected to the base plate (^) Guide element is designed accordingly, which at least partially has an area, preferably the Surrounds the end of the support rod (5). 709834/0789 E 8. 32 D If H. 99 ^ 0 to Cas 19 February 16, 1977 / 5H 9. Device according to one of claims 1-8, characterized in that the Base plate (^) a spacer on its underside (25) which tapers downwards from the side edge of the base plate (^) starting. 10. Device according to one of claims 1-9, characterized in that the Distance piece (25) has the shape of a conical stump or a pyramid. 11. Device according to one of claims 1-10, characterized in that the Guide element and the spacer (25) of the base plate (Jj-) are connected to each other. 12. Device according to one of claims 1-11, characterized in that the lower end of the spacer (2. ^) is preferably formed by the circumference of the guide element. 709834/0789