EP3158907A1 - Foldable and pivotable support handle, in particular for the sanitary field - Google Patents

Abstract

The invention relates to a support folding handle (1), as used in particular in the sanitary area. The support flap handle has a base (4) which can be attached to a support structure (5), for example a wall. Further, the support flap handle is provided with a grip portion (6) extending in a longitudinal direction (7) away from the base. A folding mechanism (14) of the support folding handle allows a folding movement of the handle portion (6) about a transverse to the longitudinal direction (7) extending folding axis (17) relative to the base (4). In order to adjust the height of the grip area in a simple manner and to reduce the space requirement when the folding support handle is folded down, a pivoting mechanism (15) is provided according to the invention which permits pivoting movement of the grip area (6) relative to the base (4) about a direction parallel to the longitudinal direction (7) ) extending pivot axis (19) allows. It is particularly advantageous if the pivoting movement (18) over a region (16b) of the folding movement (16) is automatically blocked.

Description

The invention relates to a support folding handle, in particular for the sanitary area, with a base, which is designed to be fastened to a support structure, such as a wall, with a handle portion which extends in a longitudinal direction away from the base, and with a folding mechanism, the folding movement the grip area allows a transversely to the longitudinal direction extending folding axis relative to the base.

Such support folding handles are used in particular in the sanitary area of hospitals, clinics and nursing homes.

Support folding handles with the features mentioned are known. For example, the support folding handles SGK and ESK Erlau AG are provided with a base that allows the attachment of the support folding handle on the wall. The grip area extends horizontally in a position of use so that people can lean on it. In a stowage the handle area is folded up against the wall, so that the support flap handle occupies little space. This staging allows caregivers better access to the caregiver.

The grip areas of the known support folding handles are bent in part in a U-shape, so that the two legs of the U-shape form gripping bars at different heights. However, the height can not be adjusted after attaching the support folding handle on the wall. Another disadvantage of the known support folding handles is that they take up unnecessarily much space in the stowed position.

In view of these disadvantages, the invention has for its object to provide a support folding handle, which allows a subsequent adjustment of the handle height with a small congestion. This object is achieved for the above-mentioned support flap handle according to the invention by a pivot mechanism which allows a pivoting movement of the handle portion relative to the base about a pivot axis extending parallel to the longitudinal direction.

Due to the additional pivoting movement, it is possible to pivot the grip area in the stowed position, so that it no longer protrudes into the room. In the use position, the pivoting allows a height adjustment of the grip area.

The following independent, individually advantageous and arbitrarily combinable configurations develop the invention further.

Thus, the grip area may have at least two gripping bars. The gripper bars may be spaced apart. In the use position, the gripping bars are preferably one above the other, so that the grip area has two different gripping surfaces. At least regionally, the gripping bars can run parallel to one another, so that a user can embrace the hand position without changing the hand position. The grip area may be U-shaped in a further embodiment, wherein the legs of the U-shape may be formed by the gripper bars. The U-shape is achieved, for example, that the two gripping bars are connected by a curved piece.

It is particularly advantageous if at least one gripping bar of the gripping area extends at a distance from and along the pivot axis. If a plurality of gripping bars are present, the pivot axis can extend through one of the two gripping bars, preferably the upper gripper bar, or be spaced from both gripping bars.

It is furthermore particularly advantageous if the pivoting movement is automatically blocked as a function of a folding position of the grip area along the folding movement. This means that in some folded positions, for example the position of use, the grip area can not be pivoted, which increases safety.

According to a further advantageous embodiment, it is provided that the pivot mechanism has a locking position and an unlocking position, wherein blocked in the locking position, the pivoting movement and in the unlocked position, the pivoting movement is released. In this embodiment, it is ensured that the grip region can pivot only in a specific position of the pivoting mechanism, the unlocking position. The risk that the grip area is accidentally pivoted, for example, when a person is supported on it, can be reduced.

A further improvement of the pivoting mechanism may provide a safety mechanism cooperating with the pivoting mechanism. By the safety mechanism, the pivoting mechanism can be secured in particular depending on the folding position in the locking position. This backup or blocking is preferably done automatically. A transfer to the unlocked position is possible in this variant only when the safety mechanism releases the pivot mechanism. The safety mechanism can be actuated automatically, in particular forcibly, in a partial region of the folding movement, so that the pivoting mechanism can not be transferred from the locking position into the unlocking position in this subarea.

The range of the folding movement, in which the pivoting mechanism is secured in the locking position, or a transfer of the pivoting mechanism is blocked from the locking position to the unlocked position, preferably includes the use position. The use position can represent an end position of the folding movement of the grip area. The stowage position may be another end position of the folding movement. The area in which the pivoting mechanism is secured in the locking position and can be transferred to the unlocked position may extend over, for example, from the use position about 20 ° to 45 ° towards the stowage position. If the grip area is folded beyond this area, the pivoting mechanism or the security barrier can be automatically unlocked in a variant and the support folding handle can be pivoted.

According to a further advantageous embodiment, the grip area in the unlocked position relative to the locking position can be moved relative to the base. The grip area can serve as an actuator, with which the pivot mechanism is transferred from the locking position to the unlocked position. For this purpose, the grip area may be connected with the pivoting mechanism in a motion-transmitting manner.

The pivoting mechanism may comprise at least two positive locking elements, in each case at least one positive locking element on the gripping area and at least one complementary locking element which is disengaged from one another in the locking position and disengaged in the unlocked position. The interlocking elements can be under spring tension, so that in particular without a force acting from outside on the pivoting mechanism, the locking position is taken automatically. The gripping region can be connected with one or more of the interlocking positive locking elements in order to transmit the movement, in particular with a high degree of motion.

In a particular embodiment, the handle portion in the unlocked position relative to the locking position relative to the base translationally moved, for example, pulled away from the base to be. By this release movement, the positive-locking elements of the pivot mechanism can be disengaged.

The safety mechanism secures the interlocking elements of the swivel mechanism in the locked position by blocking disengagement of the interlocking elements. Preferably, therefore, the triggering movement of the grip area is blocked, so that the grip area in the locked area of the folding movement is exclusively hinged and otherwise immovable.

The folding mechanism may have a stop limiting the folding movement in an end position, in particular the stowage position. The stopper prevents the grip area from hitting the pedestal or the support structure. The abutment may belong to the so-ckelseitigen elements of the folding mechanism and in particular be stationary with respect to the base.

It is particularly advantageous if the stop cooperates with the pivot mechanism. Thus, according to an advantageous embodiment in a region of the folding movement of the pivot mechanism may be blocked by the stop in the locking position. For this purpose, the stop can overlap and / or penetrate the pivoting mechanism, at least in the region of the folding movement, in which the grip area is secured in the locking position. The stop is in this embodiment, in particular an element of the safety mechanism.

In a concrete embodiment, the grip area-side part of the pivot mechanism may have a receptacle for the stop. In this recording, the stop can be retracted over the locked area of the folding movement. The receptacle and the stop can form a positive connection which blocks the triggering movement of the gripping area and of the form-fitting elements of the pivoting mechanism in the locked area of the folding movement.

A high mechanical load capacity of the grip area in different pivotal positions along the pivoting movement results when the pivoting mechanism in the region of the pivoting movement has a plurality of latching positions, which are spaced apart along the pivotal movement of the handle portion. The locking of the grip area in the locking positions leads to a simple operation and at the same time an improved force absorption compared to, for example, a frictional fixing of the different positions of the grip area along the pivoting movement.

Advantageously, the pivot mechanism can be transferred only at discrete locking positions of the unlocked position in the locking position. The locking positions can be arranged symmetrically about a central position. In the middle position, the gripping bars can lie vertically one above the other. The pivoting range can extend over ± 45 °, preferably ± 25 °, from this central region.

To realize the detent positions of the pivoting mechanism can have two intermeshing, axially relative to each other sliding teeth, such as a toothed shaft and a toothed sleeve, or serrations. Such a gearing takes high forces about the pivot axis and can be solved at the same time by a simple release movement, for example by pulling the handle area.

The folding movement may, according to a further advantageous embodiment, have two end positions, wherein the grip area in one end position, preferably the use position, is not pivotable and in the other end position, the stowed position, is pivotable.

The support flap handle may further comprise a safety mechanism by which the pivot mechanism is permanently locked in the locking position. This prevents a user from inadvertently swiveling the grip area and assuming a different grip height without the user himself being able to restore the original grip height. These cases can occur, for example, in the area of nursing.

According to a further advantageous embodiment, the support flap handle may have a locking mechanism by which the pivot mechanism is permanently, ie blocked independently of the folding position in the locked position.

The locking mechanism may comprise a form-fitting blocking element which is insertable into a receptacle of the pivot mechanism and blocks the pivot mechanism or its form-locking elements in the locking position. Structurally simple, this lock can be implemented when the blocking element is coaxial with the pivot axis.

Preferably, the pivot mechanism between the folding mechanism and base is arranged. In this arrangement, the dependent of the folding movement locking the pivot mechanism is particularly easy to implement.

In the following the invention with reference to an embodiment with reference to the accompanying drawings is explained in more detail by way of example. According to the above statements can be dispensed with individual features of the illustrated embodiment, if it does not depend on the advantage associated with this feature in a specific application.

In the various figures, the same reference numerals are used for elements which correspond to each other in structure and / or function, for the sake of simplicity.

Fig. 1

eine schematische Seitenansicht einer Ausgestaltung eines erfindungsgemäßen Stützklappgriffes in einer Gebrauchsstellung;

Fig. 2-4

schematische Vorderansichten der Ausführungsform der Fig. 1 in verschiedenen Schwenkstellungen der Gebrauchsstellung;

Fig. 5

eine schematische Vorderansicht der Ausführungsform der Fig. 1 in einer Verstaustellung;

Fig. 6

eine schematische Seitenansicht der Ausführungsform der Fig. 1 in der Verstaustellung;

Fig. 7

eine schematische Draufsicht auf die Ausführungsform der Fig. 1 in der Verstaustellung;

Fig. 8

einen Schnitt entlang der Ebene VIII-VIII der Fig. 1;

Fig. 9

die Ansicht der Fig. 8, wobei sich der Schwenkmechanismus in der Entriegelungsstellung befindet;

Fig. 10

einen Schnitt entlang der Ebene X-X der Fig. 2.

Show it:

Fig. 1

a schematic side view of an embodiment of a support folding handle according to the invention in a position of use;

Fig. 2-4

schematic front views of the embodiment of the Fig. 1 in different pivot positions of the use position;

Fig. 5

a schematic front view of the embodiment of the Fig. 1 in a staging post;

Fig. 6

a schematic side view of the embodiment of the Fig. 1 in the staging post;

Fig. 7

a schematic plan view of the embodiment of the Fig. 1 in the staging post;

Fig. 8

a section along the plane VIII-VIII of Fig. 1 ;

Fig. 9

the view of Fig. 8 , wherein the pivoting mechanism is in the unlocked position;

Fig. 10

a section along the plane XX of the Fig. 2 ,

The construction and function of a support folding handle 1 according to the invention will be described in the following with reference to FIGS Fig. 1 to 7 explained. The Fig. 1 to 4 show the support folding handle 1 in a position of use 2, in which it can be used by a user for support. The Fig. 5 to 7 show the support folding handle 1 in a stowed position 3, in which he is out of the way. The illustrated support flap handle 1 is intended in particular for the sanitary area and should facilitate the use of sanitary facilities such as toilets, showers, bathtubs or sinks.

The support folding handle 1 has a base 4, which serves for attachment to a support structure 5, for example a wall, as in Fig. 1 is shown schematically. The base 4 may be plate-shaped and / or multi-part.

The support flap handle 1 further comprises a handle portion 6 which extends in a longitudinal direction 7 away from the base 4 and is preferably supported in the position of use 2 on the base at least two places. The gripping region 6 can have at least two gripping rods 8, 9, which likewise extend in the longitudinal direction 7 away from the base 4 and, in particular, can extend parallel to one another at least in regions. At least one gripping rod 8, 9 can also be bent transversely to the longitudinal direction 7. The two gripping bars 8, 9 can the end facing away from the socket 4 end 10 of the handle portion 1 by a bend piece 11 may be connected to each other, so that the handle portion 6 has a total of a U-shape. The gripping bars 8, 9 can, as in Fig. 1 shown superimposed.

At the one end of the handle region 6 facing the base 4, for example the end 12 of the upper grip rod 9, there is a joint arrangement 13, which has a folding mechanism 14 and a pivoting mechanism 15. The folding mechanism 14 allows a folding movement 16 about a folding axis 17 running transversely to the longitudinal direction. The folding movement 16 moves the support folding handle 1 back and forth between the use position 2 and the operating position 3 in particular. The use position 2 and the operating position 3 can represent the end positions of the folding movement 16.

The pivoting mechanism 15 allows a pivoting movement 18 about a pivot axis 19 extending parallel to the longitudinal direction 7. The pivoting movement 18 allows the grip region 6 or a plane 20 spanned by it to be pivoted such that the upper grip rod 9 and the lower grip rod 8 are perpendicular to one another or horizontal and vertically offset from each other. Due to the pivoting movement 18 comes, depending on the position of the pivot axis 19 relative to the gripping bars 8, 9, in the course of the pivoting movement 18 at least one gripping bar 8, 9 to lie at a different height. Due to the difference in height 21 between the in the Fig. 2 to 4 shown different pivotal positions 22 to 24 can thus realize different handle heights. In this case, the handle height of a gripper bar 8, 9 with the pivoting movement 18 changes all the more, the greater its distance from the pivot axis 19.

At the base 4 facing the other end 25 of the handle portion 6 and the end 25 of the lower gripping bar 8, the handle portion 6 is supported on the base 4 from. At the end 25, a buffer 26 may be provided for this purpose. The buffer 26 also forms the stop which limits the folding movement of the grip region 6 downwards, in the position of use 2.

While in the position of use 2, the longitudinal direction 7 of the handle portion 6 extends substantially transversely to a mounting plane 27 spanned by the base 4, the longitudinal direction 7 in the stowage position 3 is substantially parallel to the mounting plane 27. Preferably, in the stowage position 3, the grip area 6 faces the pivotal positions 22, 23, 24 shown only as an example further pivoted, so that the handle portion 6 extends substantially parallel to the mounting plane 27 of the base 4. In bent gripping bars 8, 9 with bent out of the plane 20 sections may have a different pivot position the grip area 6 in the stowage position 3 be necessary so that the support folding handle 1 projects as little as possible from the support structure 5.

Preferably, at least in the position of use 2, the grip area 6 is secured against unintentional pivoting. This backup can be canceled automatically in a region 16 of the folding movement. This is below with reference to the Fig. 8 to 10 explained.

Compared to the stowage 3 extends in the position of use 2, the plane 20 perpendicular to the mounting plane 27th

Based on Fig. 8 and 9 are explained in more detail below function and structure of the folding mechanism 14 and the pivoting mechanism 15.

The pivot mechanism 15 is located between the folding mechanism 14 and the grip portion 6.

The folding mechanism 14 may comprise at least one holder 30 which is fixed to the base 4 and projects away from it. In particular, how can Fig. 8 shows, two spaced-apart holder 30 may be provided, between which the pivoting mechanism 15 and the handle portion 6 are arranged. The holders 30 have a central opening 31, in each of which a bearing shell 32 is inserted or which itself form a bearing shell. In each case one of a preferably one-piece pivot bearing sleeve 33 formed axle stub 34 protrude in the bearing shell 32. Axle stub 34 and bearing shell 32 each form a sliding bearing designed as a folding bearing 35. The folding axis 17 preferably extends coaxially to the at least one central opening 31, as well as the stub axle 34 and the pivot bearing sleeve 33. The pivot bearing sleeve 33 forms the handle portion side part of the folding mechanism 14 and the folding bearing 35.

By using two holders 30 at a distance from each other torques resulting from the use of the grip portion 6 can be better supported.

The pivot bearing sleeve 33 is also part of the folding mechanism 14 and the pivot mechanism 15. It forms in particular a part of a pivot bearing 36 by 33 handle area side elements 37, 38 are rotatably received in the pivot bearing sleeve. The two elements 37, 38 are firmly connected to each other, for example via a screw and can also be configured in one piece. The elements 37, 38 are rigidly connected to the handle region 6.

At least one of the elements 37, 38 is supported on the base side, here on the pivot bearing sleeve 33, via an intermediate spring 39. Against the action of the spring 39, the elements 37, 38 in the release direction 40, in particular in the longitudinal direction 7 relative to the base 4 are movable. One of the elements 37, 38, for example the element 38 facing the grip region 6, is provided with interlocking elements 41, for example a toothing, which are in engagement with corresponding socket-side interlocking elements 41. The base-side form-fitting elements 41 may be configured on the pivot bearing sleeve 33.

The interlocking elements 41 block a pivoting movement 18 and at the same time take up torques about the longitudinal direction 7 of the grip region 6, which can arise during its use. A pivoting movement is only possible when the positive-locking elements 41 have been disengaged in the triggering direction 40 in the course of a release movement. This is done translationally in the illustrated embodiment and takes place, for example, by pulling on the grip region 6 in the longitudinal direction. Of course, other triggering movements, such as a press, possible.

Is pulled on the handle portion 6, the elements 37, 38 are moved against the action of the spring 39 together with the handle portion 6 relative to the pivot bearing sleeve 33 along the release direction 40 and the interlocking elements 41 are disengaged. Then, the handle portion 6 can be pivoted about the pivot axis 19 and in the new pivot position, the interlocking elements 41 are brought back into engagement. Depending on the configuration of the positive locking elements 41 are only certain discrete pivot positions, for example, in the Fig. 2 to 4 shown pivoting positions possible. During the pivoting movement 19, the elements 37, 38 rotate in the pivot bearing sleeve 33.

So in order to pivot the grip area 6, the pivot mechanism 15 must first of the in Fig. 8 illustrated locking position 41 in the in Fig. 9 shown unlocking position 43 are transferred. In the locking position 42, the pivoting movement 19 is blocked while it is released in the unlocked position 43. As below with reference to the Fig. 10 is explained, the pivot mechanism 15 in a region 16 b ( Fig. 1 ) of the pivoting movement 16 are automatically locked in the locking position.

The pivoting mechanism 15 can be permanently fixed in the locking position 42. The locking mechanism 44 blocks the relative movement of the grip area side elements 37, 38 relative to the socket-side element 33 of the pivot mechanism 15 in the release direction 40. In the embodiment of the Fig. 8 he follows this by a screw 45 which is brought into engagement with a receptacle 46 and serves as a stop for at least one of the elements 37, 38 of the pivot mechanism 15 in the release direction 40 as soon as it projects into the receptacle 46. The receptacle 46 can simultaneously receive the spring 39.

In the position of use 2, if possible, the pivoting movement 18 should be permanently blocked, so that the grip area 6 is not accidentally transferred under load in the unlocked position 43 and pivoted so that the person supporting himself on the support flap handle 1 crashes. To prevent this, the pivot mechanism 15 is automatically locked in the locking position 42 in response to the folding movement 16.

It is provided in particular that the pivoting mechanism 15 is automatically locked in the locking position 42, when the grip portion 6 in the use position 2 or in a subsequent to the use position 2 area 16b of the folding movement 16, which is up to about 45 ° or less, For example, to about 25 °, from the use position 2 towards the stowage 3, may extend. Only when the folding movement 16 has left the locked area 16b can the unlocking position 43 be taken. This is below with reference to the Fig. 10 explained.

As Fig. 10 shows, a stop 50, for example, a between the holders 30 at a distance from the folding axis 17, preferably parallel to this extending pin provided. The stopper 50 is stationary with respect to the base 4 and immersed in the position of use 2 at least partially in a handle portion side member 37, 38, here the element 38, the pivot mechanism 15. The handle portion side member 37, 38 is provided with a receptacle 51, in which Stop 50 is receivable. As long as the stopper 50 protrudes into the receptacle 51, these two elements form a form fit, which prevents a relative movement of the handle portion side member 37, 38 in the release direction 40 and thus a transfer of the pivot mechanism 15 from the locking position 42 into the unlocked position 43. The approximate position in which the stop 50 is located as soon as the locking position 42 is no longer secured, is in Fig. 9 shown by the reference numeral 52 by dashed lines. The stopper 50 in this way forms a safety lock of the swivel mechanism.

Of course, the hinged angle-dependent locking of the pivot mechanism 15, a different arrangement than in Fig. 10 be used. For an effective blockage of the pivot mechanism 15, it is initially only important that a positive connection between the elements of the swivel mechanism 15 which are movable relative to one another in the release direction 40 and an element which is stationary relative to the base, the stop 50, over a predetermined angular range 16b, which preferably comprises the use position 2.

reference numeral

1

Support arm

2

use position

3

stowed

4

base

5

holding structure

6

grip area

7

longitudinal direction

8th

(lower) gripper bar

9

(upper) gripping bar

10

from the base end facing away from the handle area

11

elbow

12

the base facing the end of a gripping bar or one end of the handle portion

13

joint arrangement

14

folding mechanism

15

swivel mechanism

16

folding movement

16a

Range of the folding movement, in which the swivel mechanism can be unlocked

16b

Area of the folding movement, in which the pivoting mechanism is preferably automatically locked

17

folding axis

18

pivotal movement

19

swivel axis

20

plane spanned by the grip area

21

Height difference due to pivoting movement

22-24

different pivot positions of the handle portion in the position of use

25

the socket facing the end of the lower gripping bar or other socket-side end of the handle portion

26

buffer

27

mounting level

30

holder

31

Central opening of the holder

32

bearing shell

33

Swivel bearing sleeve

34

stub axle

35

Safety chucks

36

pivot bearing

37

handle area-side element of the pivot bearing

38

another grip area-side element of the pivot bearing

39

feather

40

tripping direction

41

Form-fitting elements

42

locking position

43

unlocking

44

locking mechanism

45

screw

46

admission

50

attack

51

admission

52

Position of the stop in the unlocked position

Claims (15)

Support folding handle (1), in particular for the sanitary area, with a base (4) which is fastened to a holding structure (5), such as a wall, with a grip area (6) extending in a longitudinal direction (7) from the base (7). 4), and with a folding mechanism (14), which allows a folding movement of the handle portion (6) about a transverse to the longitudinal direction (7) extending folding axis (17) relative to the base (4), characterized by a pivoting mechanism (15), a pivoting movement (18) of the handle portion (6) relative to the base (4) about a parallel to the longitudinal direction (7) extending pivot axis (19) allows. Support folding handle (1) according to claim 1, characterized in that in a region (16b) of the folding movement (16) of the pivot mechanism (15) in the locking position (42) is automatically blocked. Support folding handle (1) according to claim 1 or 2, characterized in that the pivot mechanism (15) has a locking position (42) and an unlocking position (43), wherein in the locking position (42) blocks the pivoting movement (18) and in the unlocked position ( 43) the pivoting movement (18) is released. Support folding handle (1) according to claim 2 or 3, characterized in that the handle portion (6) in the unlocked position (43) relative to the locking position (42) relative to the base (4) is moved. Support folding handle (1) according to claim 4, characterized in that the handle portion (6) in the unlocked position (43) relative to the locking position (42) relative to the base (4) in the longitudinal direction (7) is moved. Support folding handle (1) according to one of claims 3 to 5, characterized in that a base-side safety lock (50) is provided by the pivot mechanism (15) in a region (16b) of the folding movement (16) is automatically blocked by positive locking. Support folding handle (1) according to one of claims 1 to 6, characterized in that the folding mechanism (14) has a folding movement (16) in one direction limiting stop (50) which cooperates with the pivot mechanism (15). Support folding handle (1) according to claim 6 and 7, characterized in that the stop (50) forms the blocking element Support folding handle (1) according to one of claims 1 to 8, characterized in that the pivoting mechanism (15) in the region of the pivoting movement (18) has a plurality of latched pivotal positions (22, 23, 24) along the pivoting movement (18) of the Handle portion (6) are spaced from each other. Support folding handle (1) according to one of claims 1 to 9, characterized in that the pivoting movement (18) at least in a use position (2) in which the longitudinal direction (7) of the handle portion (6) substantially transversely to a mounting plane (27 ) of the base (4) and / or the grip area (6) is supported by a base-side end (25) on the base (4). Support folding handle (1) according to one of claims 1 to 10, characterized in that the folding movement (16) has two end positions (2, 3) and that the handle portion (6) in one end position (3) pivotable and in the other end position ( 2) is not pivotable. Support folding handle (1) according to one of claims 1 to 11, characterized in that a locking mechanism (44) is provided, by which the pivot mechanism (15) independent of the folding movement (16) in the locking position (42) can be fixed. Support folding handle (1) according to one of claims 1 to 12, characterized in that the pivot mechanism (15) between the folding mechanism (14) and the base (4) is arranged. Support folding handle (1) according to one of claims 1 to 13, characterized in that the handle region at least (6) has two mutually parallel gripping rods (8, 9). Support folding handle (1) according to one of claims 1 to 14, characterized in that the handle region (6) has at least one gripping bar (8, 9) which extends at a distance from the pivot axis (19).

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