DE9305617U1 - Device for undressing and dressing or for cleaning and supplying the disabled human body - Google Patents

Abstract

The aim of the invention is to improve a device (1) designed for use in dressing and undressing and in cleaning handicapped persons, so that cleaning of the body, particularly the difficultly accessible excretion regions, is facilitated. The device (1) consists of a mobile frame (2) with a patient-carrying surface (3) which can be tilted upwards at various angles about an axis (4) parallel to the base of the device (1) near the bottom of the frame (2), means (8, 9, 10) being fitted on the patient-carrying surface to support the body or hold it in place.

Description

PATENT ATTORNEYS D-483C, Gütersloh, VennitralSc

Telephone: (05241)13054

Dipl.-Ing. Gustav Meldau Date: 8.04.93

DipLPhys. Dr. Hans-Jochen Strauß Our reference: G 516

Woman

Irmgard Göhlert

Schmiedekoppel 110

2407 Bad Schwartau

Device for undressing and dressing or for cleaning and caring for the disabled human body

The invention relates to a device for undressing and dressing or for cleaning and caring for the disabled human body.

According to the state of the art, there are aids that are used to care for disabled people. For example, lifting devices or movable chairs are known that are intended to make it easier to care for disabled people.

However, these devices do not allow the disabled human body to

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The care required by nursing staff is particularly difficult for this area of the body, as the disabled body can often only be held or turned by several people in order to ensure adequate access to this area of the body. This area of the body often has to be washed several times a day and fresh diapers have to be put on. The appropriate staff must always be available for this work in order to make this area of the human body accessible for care.

It is therefore the object of the invention to create a device that makes it easier to care for the disabled human body with regard to the poorly accessible excretory area.

This object is achieved according to the invention in that the device consists of a mobile frame with a support surface, which can be pivoted into different angular positions on the front on an axis running parallel to the base of the device in the lower area of the frame, with means for supporting or holding the disabled human body being arranged on the support surface. This design of the device makes it possible to move the patient or the disabled human body from a sitting position to a bridge-like, kneeling position. For this purpose, the mobile frame is moved from its front in front of the disabled body, with the angular position of the support surface being set as steeply as possible. With the help of a carer, the human body is brought to the steeply positioned support surface. The human body is supported on the support surface by means that hold it in the bridge-like, kneeling position. The support surface is then pivoted from the upright position to a flatter position so that the patient lying on it can be placed in a stable position.

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It has been achieved in an advantageous manner that the diapers or clothing can now be removed, particularly in the excretory area, so that the staff to be cared for can clean and care for this area. Furthermore, with the device according to the invention, the human body supported on it can be moved with the frame into a shower device. The staff to be cared for can then clean the human body on this device and, after completing the care work, dress it again or move it back to its bed or chair.

In a further development of the invention, the frame consists of two parallel tubes, between which the support surface is arranged, with a boom for pivoting the support surface being hinged to the tubes on the underside of the support surface. Using this boom, the angle of attack for supporting the human body can be easily adjusted. Making the frame out of tubes ensures that the device as such is light and stable. The angle of attack of the support surface can be set very steeply due to the telescoping of the boom. The telescoping process can be facilitated by a hydraulic device. The different angle positions are advantageously set using a locking device. Rollers or wheels are provided on the end of the boom to enable the device to be moved or the boom to be pivoted on the base.

The means forming the support surface for supporting the human body are conveniently attached between the tubes. The means forming the support surface consist of a head, chest and knee support. The body resting on them is thus supported in the chest area either by the chest itself or by the elbows on the chest support. To support the knee area, there is a knee support in the lower area.

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support on which the lower body part is supported while kneeling.

This support of the human body achieves the bridge-like position of the human body on the support surface according to the invention. Advantageously, a headrest is attached above the chest support, on which the head can be placed as required.

The headrest is advantageously arranged between the tubes so that it can be swiveled to adjust the height and can be removed from the frame if necessary. The chest support can be designed as a one- or two-piece recess. The two-piece recess is therefore advantageous for elbow support. The knee support can also be adjusted to the body size or the position on the support surface by swiveling or adjusting the height of the parallel tubes.

According to an advantageous development of the invention, pivoting brackets are arranged on the parallel tubes for lateral support or support when the human body is placed on the support surface. The laterally pivoting brackets give the patient security during the transfer process in that he can hold on to these brackets and support himself. During the transfer process, the patient does not need to move or grasp the hand or the supporting elbow on the bracket, as the bracket is designed to pivot and follows the support movement from the sitting to the supported bridge position. In addition, these laterally attached brackets prevent the human body from sliding sideways off the device and give the patient lying on it a secure support feeling during the treatment.

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For this purpose, the bars are advantageously made of articulated, parallelogram-like longitudinal and transverse tubes, which enable the pivoting movement when the disabled human body is supported. If the patient is still in a sitting position, he can grasp the side bars with one or both hands, or support himself with his elbows in the recessed grips and hold on. With the support of the nursing staff, the disabled person can now move onto the inclined support surface, with the parallelogram-like tube construction moving towards the support surface, so that lateral support is guaranteed in any case during the movement process.

To support the feet when moving, there is a footrest at the end of the parallel tubes in the area of the swivel axis. This footrest can be set in angle positions using a locking adjustment so that the device can be moved under the feet of the human body to be treated, like a cart, for example. To make the device easy and easier to handle for the nursing staff, handles are provided at the end of the tubes.

In order to move the device, wheels are arranged on the swivel axis in the area of the hinged footrests, which, in conjunction with the wheels on the boom, ensure that the device can be moved.

According to a further advantageous embodiment of the invention, the frame can be folded around its central axis, with a joint being arranged in the area of the central axis on the head section, chest section, knee section and footrest. The foldability enables the entire device to be reduced to a size so that the device can be easily stowed away and used by the nursing staff when required.

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can be prepared.

A preferred first alternative embodiment is provided in that the frame is designed as a winding frame and has at least one front, preferably telescopic support with a roller and a horizontal leg, as well as preferably a rear support with a roller, and in that the support surface provided on the support is designed in one piece and has at least hinged, preferably trough-shaped chest and knee supports that are pivotable about vertical axes, which can be pivoted about horizontal axes and whose width essentially corresponds to the seat width. A second embodiment is provided in that the frame is designed as an angle frame in two halves, mirror-symmetrical to the central axis, and each half has at least one front, preferably telescopic, support with a roller and preferably a rear support with a roller, and that the support surface provided on the support is designed in two parts and each partial surface has preferably trough-shaped chest and knee supports that are pivotable at least about vertical axes, which can be pivoted about horizontal axes and whose widths correspond essentially to half the seat width. With these embodiments, a device is created that can be connected to a chair - be it for disabled people, a shower chair or other chair, including a mobile one, which allows the bodies of disabled people to be repositioned for care and support without overtaxing the nursing staff.

It is advantageous to provide joints for the pivoting supports, which are locked against further movement in the pivoted-out position. With these joints, the supports can be pivoted into the position required for repositioning the body. Attaching the joint to a lock prevents any danger from pivoting too far. Detachable catches can also be provided for locking, which allow the desired position to be set.

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position of the supports. The work of the caregiver can be made easier if the height of the front support can be reduced, thereby lowering the patient's upper body and facilitating access to the areas requiring care.

In order to connect the angle frame to the chair, it is proposed that the horizontal legs of the angle frame are integrated into the side parts with the armrests of the chair, whereby each of the parts of the angle frame can be pulled out to or from the side parts of the chair with the armrests and has at least one front support provided with a roller, and whereby the angle frame can be placed in front of the chair by pulling out, and whereby the horizontal legs preferably form armrests that move with it. This development allows a direct connection of the angle frame to the chair, whereby, for example, the horizontal leg and the armrest are connected to a pull-out-like guide with a rail and rollers. In an alternative form, the horizontal legs of the angle frame are integrated into the side parts with the armrests of the chair, whereby each of the parts of the angle frame is pivotally connected to the side parts with the armrests of the chair and has at least one front support provided with a transverse roller, whereby the angle frame can be placed in front of the chair by pivoting, and whereby the horizontal legs preferably form armrests. In both embodiments, the angle frame is placed in front of the associated side part of the chair, whereby the first embodiment allows it to be pulled out or pushed in and the second embodiment allows it to be pivoted out or in. The horizontal legs of the angle frame, which form the extensions of the armrests when the angle frame is pulled out or pivoted out, are important because the patient can hold on to them (at least on one side). The angle frame is advantageously attached to the side part in a removable manner, which allows it to be used with several chairs.

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To ensure safe positioning of the patient, a headrest is expediently arranged so that it can be pivoted between the tubes of the tubular frame or the horizontal legs of the angle frame for height adjustment and can be removed from the tubular frame or the wrap frame if necessary. The same applies to the knee support, which is advantageously arranged so that it can be adjusted between the parallel tubes of the tubular frame or the supports of the angle frame. A footrest hinged to the end of the parallel tubes of the tubular frame or the supports of the angle frame, which can be secured using a locking device, serves to provide comfort, whereby the adjustment of the knee support and the footrest in particular is of nursing importance, especially in cases of severe knee arthrosis. The essence of the invention is explained in more detail using the exemplary embodiments shown in Figures 1 to 7; in which:

Fig. 01: A device attachable to a chair for dressing or cleaning and caring for the disabled human body;

Fig. 02: A side view of a device that can be attached to a (suggested) chair with an angled frame, supported at both ends, knee and chest supports swiveled in;

Fig. 03: A side view of a device that can be attached to a (suggested) chair with an angled frame, supported at one end, knee and chest support pivoted in;

Fig. 04: A side view of a device according to Fig. 3, but with the device extended, knee and chest supports swung out;

Fig. 05: A top view of a mobile chair for disabled people with a device attached to one side;

Fig. 06: A top view of a mobile chair according to Fig. 5; but with the device extended, knee and chest support pivoted into the support position;

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Fig. 07: A top view of a mobile chair for disabled people with a device attached on both sides, knee and chest supports pivoted into the support position.

Fig. 08: A perspective view of the chair with the device attached according to Fig. 3.

In Figure 1, the device according to the invention for dressing or cleaning and caring for the disabled human body is designated with the reference number 1. The device 1 consists of a mobile frame 2 in which a support surface 3 is pivotably mounted in various angular positions. To set the different angular positions, the support surface 3 can be pivoted at the front on an axis 4 in the frame 2 that runs parallel to the standing surface. The support surface 3 has means 8, 9 and 10 that support or hold the disabled human body.

The frame 2 is made up of two parallel tubes 5.1 and 5.2, between which the support surface 3 is attached. On the underside of the support surface 3, an arm 6 is attached for adjusting the angle of the support surface 3. The arm 6 is pivotally mounted on the tubes 5.1 and 5.2 using joints. The bearing points 7 are located approximately in the upper area of the frame 2. To determine the respective angular position of the support surface 3, the arm 6 has a (not shown in more detail) locking device that keeps the support surface 3 stable in the respective angled position. To achieve a support surface 3 that is as steep as possible, the arm 6 is designed to be telescopic, whereby the telescoping can be supported by a hydraulic device (not shown in more detail).

The means 4 forming the support surface 3 for supporting the human

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The supports for the disabled human body are fastened between the parallel tubes 5.1 and 5.2. These means 4 consist of a headrest 8, a chest support 9 and a knee support 10. The headrest 8 is pivotally mounted between the tubes 5.1 and 5.2 to ensure that the head is supported correctly and can also be removed from the frame 2 as required. The chest support 9 can be designed as a one- or two-piece trough. The drawing shows the two-piece design of a trough in which the elbows can be supported in order to achieve the bridge position of the disabled human body on the support surface 3. With the one-piece trough, the chest is placed in the trough of the chest support 9 so that the chest is adequately supported on the support surface 3. The last support means is the knee support 10 in the lower area of the frame 2 between the tubes 5.1 and 5.2. The knee support 10 can also be designed in a trough-like or bowl-like manner in order to provide the knee joints with sufficient support so that the patient lying on it experiences sufficient support security.

Pivoting brackets 11 are arranged on the parallel tubes 5.1 and 5.2 for lateral support when the human body is resting on the support surface 3. The brackets 11 are formed from longitudinal and transverse tubes 12.1 and 12.2 arranged in a parallelogram manner and connected to one another. The longitudinal and transverse tubes 12.1 and 12.2 arranged in a parallelogram manner are pivotally mounted on the tubes 5.1 and 5.2 of the frame 2. Due to the parallelogram-like design of the bracket 11, the disabled human body can support itself or hold on to the transversely moving transverse tubes 12.2 during the support movement.

At the lower end of the frame 2, a footrest 13 is hinged to the parallel tubes 5.1 and 5.2 and can be secured by means of a locking device (not shown in detail).

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The standing footrest 13 can be maneuvered with the mobile frame 2, for example, between the chair legs, so that the patient can place the soles of his feet on the footrests 13 and thus already have a first direct contact with the device 1. The corresponding steep angle of the support surface 3 is then set by means of the boom 6 by pivoting or telescoping. The patient is then guided to the support surface with the support of a carer, so that the knee area is initially supported on the knee supports 10. The elbows are then placed in the chest supports 9 to support the disabled human body at an angle. If required, the headrest 8 can also be inserted between the tubes 5.1 and 5.2. The disabled human body, supported in a bridge position on the support surface 3, now allows the nursing staff easier access to the excretory areas of the human body. In this position, the diaper can now easily be removed from the human body in order to clean the excretory organs and then put on new diapers after cleaning. It would also be conceivable to move the human body on the mobile frame 2 into a shower facility, where the whole body can then be cleaned. After treatment, the patient lying on the bed is moved back to his bed or chair and repositioned from the support surface 3 in the reverse order by setting the correspondingly steep angle using the boom 6. To enable the frame 1 to be moved, handle elements 14 are provided on the operator side on the parallel pipes 5.1 and 5.2.

According to a further development of the invention, the frame 2 can be folded around its central axis 15. In this case, joints 16 are arranged on the headrest 8, the chest support 9, the knee support 10 and the footrest 13, also in the area of the central axis 15 of the device 1. In this way, the front

device 1, the frame 2 can be halved in terms of its spatial extent. This not only makes it easier to store the device 1 in cupboards, but it can also be transported more easily in a trolley, so that the device 1 can be easily taken along when the patient is moved, for example.

Figures 2 to 4 show another embodiment; here the frame 1, designed as an angle frame ^21, is attached or integrated to the side of a mobile chair 20, the chair being provided with rollers 21.1 on its rear legs 21 and with corresponding rollers 22.1 on its front legs 22 (omitted in Figure 2 for the sake of clarity), and the rear legs 21 extending upwards form the holders for the backrest 23. The changing frame 2' is formed by a front support 18 and a horizontal leg 15 attached to its upper end, which can be supported against the armrest 24 of the chair 20 and guided by it. An alternative is provided in that the angle frame 2' has a rear support 17, which can be seen in Figure 2 and is provided with a roller 17.1. In both embodiments, a handle 14 is provided on the front support 16 for better handling. In this embodiment, the angle frame ²¹ can also be moved independently of the chair 20. The front support has two joints 18 provided at different heights, to which the chest and knee supports 9 and 10 are pivotably connected about a vertical axis 18.1. The distance "a" between the two pivot axes 18.1 from each other (and from the front support) is such that the chest and knee supports are at the appropriate distance from each other for the patient when pivoted out. The chest and knee supports 9 and 10 are connected to the joints 18 via arms 19 and can be pivoted about a horizontal axis 19.1, with the distance "b" of the pivot axis from the central axis of the supports 9 and 10 allowing the position of the supports pivoted into the position of use to be adjusted to the requirements.

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can be set down. It is advantageous to pivot about the horizontal axis 19.1 against a spring force, whereby the spring force causes the return. Figure 4 shows the embodiment according to Figure 3 with the angle frame 2' extended and the chest and knee supports 9 and 10 pivoted into the position of use. The chest support pivoted against the load in accordance with the arrow shown is releasably fixed in the support position, for example by means of locking pins, catches, clamps or the like.

Figures 5 to 7 show these positions from above, with the chair 20 shown in full here. In Figure 5, the angle frame Γ is attached to the armrest 24 of the chair 20, whereby it goes without saying that the armrest has a guide (not shown in detail) into which the free end of the horizontal leg 15 engages and is supported. The two supports, chest support 9 and knee support 10, are pivoted into the plane of the angle frame ²¹ and are invisible in this representation. Figure 6 shows the angle frame Γ extended, with the angle frame here being positioned on one side against the chair 20. The chest support 9 and the knee support 10 are pivoted into the position of use about the vertical axes 18.1 (Fig. 2-4) and about the horizontal axes 19.1. Figure 7 shows a further development in which the angle frame ²¹ is positioned on both sides of the chair 20. In this embodiment, the chest supports 9 and the knee supports 10 are divided into two halves 9.1, 9.2 and 10.1, 10.2 respectively and are pivoted against each other by the respectively assigned part of the angle frame ²¹ .

In order to be able to reposition the patient sitting on the seat 25, this device must be brought into the position for use. The angle frame I ¹ is placed in front of the chair 20, whereby it is irrelevant whether it is moved separately to the chair 20, is provided as an integral part of the armrests 24 of the chair 20 and can be swung out or pulled out. During these movements, it is

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It is essential that the angle frame ²¹ is first advanced far enough so that the chest support 9 or chest supports 9.1 and 9.2 can be pivoted in the joints 18 about the vertical axis 18.1 towards the centre and can be rotated about the horizontal axes 19.1 of the boom 19 into the position of use. The changing frame 2' is then brought into a position in which the patient can place his knee or the upper ends of his lower legs against the knee support(s) 10 or 10.1 and 10.2. He is then pulled forwards with the assistance of a carer so that his chest/shoulder area lies against the chest support(s) 9 or 9.1 and 9.2, whereby the patient can support himself on the horizontal leg(s) 15 or 15.1 and 15.2 of the angle frame ²¹ , which are designed like a handrail. The patient is finally pulled forwards so that the excretory areas are easily accessible for the nursing staff and cleaning and changing diapers or dressing is possible without effort. In order to be able to lower the patient's upper body further, the front support is designed to be telescopic with a manual or hydraulic drive, with locking pins - as shown here - securing the position. The angle frame 2' attached to one side (Fig. 6) offers the advantage of better accessibility, while the design with angle frames 2' attached to both sides (Fig. 7) ensures greater stability, whereby it goes without saying that with the angle frame 2 ¹ attached to one side, the free ends of the supports 9 and 10 can, for example, have foldable supports in order to absorb the tipping forces that occur.

Figure 8 shows a perspective view of a chair 20 according to Figure 3 with a movable angle frame 2'. The chair 20 with its rear and front legs 21 and 22, each provided with a wheel 21.1 or 22.1, has a backrest 23 as an extension of the rear legs 21, as well as a seat 25. On both sides above the seat 25 there are armrests 24, which are able to provide support and stability for the disabled person. The changing frame 2' is attached to one armrest (in the illustration the right one), which has a horizontal

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leg 15, the front end of which is supported by a support 16 with roller 16.1, and in which a guide 15.1 is provided, in which guide elements provided on the armrest - such as guide rollers - engage. The arms 19 with the swivel joints with horizontal swivel axis 19.1 are fixed to the front support 16 in joint pieces 18 (Fig. 2, 3, 4) with vertical swivel axis 18.1, which in turn carry the chest and knee supports 8 and 10 (only indicated in the illustration), whereby these supports can be swiveled about the horizontal swivel axes 19.1. It is advantageous if the swiveling at least of the knee support 10 takes place against a spring force, which ensures that the support returns when the load is relieved. The chest support is advantageously fixed by locking or clamping for security. The angle frame 2' is advantageously connected to the chair 20 in a removable manner, so that the changing frame can also be attached to other chairs. In this case, holding and guiding elements that engage with one another are used, which allow both pulling forward and removing. However, clamps or the like can also be used, which create a detachable but also firm connection between the chair 20 and the angle frame 2'.

Claims (1)

PATENT ATTORNEYS D-4830 Güiersloh, VenrstTrie Share: (05241)12354 Dipl.-Ing. Gustav Meldau Date: 8.04.93 DipLPhys. Dr. Hans-Jochen Strauß Our reference: G 516 Protection claims 01. Device for undressing and dressing or for cleaning and caring for the disabled human body, characterized in that the device (1) consists of a mobile frame (2) with a support surface (3) which can be pivoted into different angular positions on the front side on an axis (4) running parallel to the base of the device (1) in the lower region of the frame (2), means (8,9,10) for supporting or holding the body being arranged on the support surface (3). 02. Device according to claim 1, characterized in that the means forming the support surface (3) consist of at least a chest support (9) and a knee support (10), wherein preferably an additional head support (8) is provided. 03. Device according to claim 1 or 2, characterized in that the frame is designed as a tubular frame (2), consisting of two parallel tubes (5.1, 5.2) as side supports, between which the support surface (3) is arranged, wherein on the underside of the support surface (3) a boom (6) for pivoting the support surface (3) is articulated to the tubes (5.1, 5.2), which preferably - 2 - G516 have handle elements (14) at their operating ends. 04. Device according to claim 3, characterized in that the boom (6) consists of telescopic tubes, the different pivoting positions of which can be fixed by means of a locking device. 05. Device according to claims 3 and 4, characterized in that wheels are arranged at the end of the boom (6), preferably on an axle (4). 06. Device according to one of claims 1 to 5, characterized in that pivotable brackets (11) are arranged on the parallel tubes (5.1 and 5.2) for lateral holding or support when the human body is placed on the support surface (3). 07. Device according to claim 6, characterized in that the brackets (11) consist of longitudinal and transverse tubes (12.1 and 12.2) which are connected to one another in an articulated manner and arranged in a parallelogram, which can be pivoted in a supporting manner during the support movement of the disabled human body. 08. Device according to one of claims 1 to 7, characterized in that the frame (2) is foldable about its central axis (15), with a joint (16) being arranged in the region of the central axis (15) on each of the head (8), chest (9), knee (10) and foot (13) sections. 09. Device according to claim 1 or 2, characterized in that the frame is designed as an angle frame (2 ¹ ) - 3 - G bl6 and has at least one front, preferably telescopic support (16) with a roller (16.1) and a horizontal leg (15), and preferably a rear support (17) with a roller (17.1), and that the support surface (3) provided on the support (17; 18) is formed in one piece and has at least pivotable, preferably trough-shaped chest and knee supports (9, 10) which are pivotable about vertical axes (18.1), which can be pivoted about horizontal axes (19.1) and whose width essentially corresponds to the seat width. 10. Device according to claim 1 or 2, characterized in that the frame is designed as a winding frame (2') in two halves, mirror-symmetrical to the central axis, and each half has at least one front, preferably telescopic support (16) with a roller (16.1) and preferably a rear support (17) with a roller (17.1), and that the support surface (3) provided on the supports (16, 17) is designed in two parts and each partial surface has preferably trough-shaped chest and knee supports (9, 10) which are pivotably articulated at least about vertical axes (18.1), which can be pivoted about horizontal axes (19.1), and whose width corresponds essentially to half the seat width. 11. Device according to claim 9 or 10, characterized in that vertical-axis joints (18) are provided for the articulation of the pivotable supports (9.1, 9.2, 10.1, 10.2), which are locked against further movement by abutment in the pivoted-out position. 12. Device according to claim 9, 10 or 11, characterized in that the horizontal legs (15) of the angle - 4 - G516 stellIs (2 ¹ ) are integrated into the side parts with the armrests (24) of the chair (20), wherein each of the parts of the angle frame (2 ¹ ) is extendable to or from the side parts of the chair (20) with the armrests (24) and has at least one front support (16) provided with a roller (16.1), and wherein the angle frame (2 ¹ ) can be placed in front of the chair by pulling out, and wherein the horizontal legs (15) preferably form co-moving armrests. 13. Device according to claim 9 or 10, characterized in that the horizontal legs (15) of the angle frame ( ²¹ ) are integrated into the side parts with the armrests (24) of the chair (20), wherein each of the parts of the angle frame (2') is pivotally connected to the side parts with the armrests (24) of the chair (20) and has at least one front support (16) provided with a transverse roller, wherein the angle frame (2') can be placed in front of the chair by pivoting, and wherein the horizontal legs (15) preferably form armrests. 14. Device according to one of claims 9 to 13, characterized in that the angle frame ( ²¹ ) can be removably fastened to the side part(s) of the chair (20), preferably by means of positively interacting sliding elements. 15. Device according to one of claims 1 to 14, characterized in that a headrest (8) is arranged between the tubes (5.1 and 5.2) of the tubular frame (2) or the horizontal legs (15) of the angle frame ( ²¹ ) so as to be pivotable for height adjustment and can be detached from the frame (2; 2") if required. - 5 - G516 16. Device according to one of claims 1 to 15, characterized in that the knee support (10) is adjustable between the parallel tubes (5.1 and 5.2) of the tubular frame (2) or the supports (16; 17) of the angle frame
(2 ¹ ) is arranged. 17. Device according to one of claims 1 to 16, characterized in that a footrest (13) is hinged to the ends of the parallel tubes (5.1 and 5.2) of the tubular frame (2) or the supports (16; 17) of the angle frame (2') and can be fixed by means of a locking device.