EP3470597B1

EP3470597B1 - Articulated arm for awning and awning comprising said arm

Info

Publication number: EP3470597B1
Application number: EP18197654.9A
Authority: EP
Inventors: Aristide Radaelli; Davide Vigano'
Original assignee: Brianzatende Srl
Current assignee: Brianzatende Srl
Priority date: 2017-09-29
Filing date: 2018-09-28
Publication date: 2020-05-13
Anticipated expiration: 2038-09-28
Also published as: ES2802325T3; IT201700109334A1; EP3470597A1

Description

Field of the invention

The present invention relates to an articulated arm for arm awnings and an awning comprising said arm. The present invention preferably but not exclusively finds application within the field of sun awnings, usually for outdoor spaces, which comprise two or more jointed or articulated arms, wherein said arms serve the function of allowing the opening of the awning, allowing its inclination and also of supporting the awning.

Background of the invention

Articulated arms for sun awnings have been known for a long time.
For example, the patent EP1650373 illustrates an articulated arm for sun awnings that comprises an arm and a forearm jointed together by means of an articulated joint. The arm has an end fastened by means of an articulated joint to a fixed support and an opposite end fastened by means of an articulated joint to an end of the forearm. The other end of the forearm is connected to a bar. The awning extends between the fixed support and the bar.
Articulated arms comprising lighting systems are also known. Such lighting systems usually consist of lights, for example arrays of LEDs, which are mounted outside the arm and the forearm with the related power supply cables that run, visible, along the forearm and the arm to the fixed support to be able to connect them to an electrical power supply. Also known are articulated arms in which the power supply cables are made to run partially inside the arm and the forearm but that at the articulated joint between arm and forearm remain visible forming a bend that hangs down when the arm is extended because it has to be able to allow the arm to bend freely. Document EP2902565 is also known disclosing an articulated arm comprising an articulated joint with a housing to allow passage of a cable.

Summary

In this field, the Applicant has observed that known articulated arms can be improved according to different aspects, in particular with reference to the structure, management and arrangement of the lighting systems and, more in general, of electric users mounted on the arm.
In this field, the Applicant has perceived the need to:

▪ realize an articulated arm provided with electric users, in particular with lighting systems, mounted on the arm and/or more in general on the awning, that is safe and reliable;
▪ realize an articulated arm provided with electric users that can easily be inspected to allow maintenance and/or repair interventions;
▪ protect the power supply cables while allowing an easy access for the maintenance and/or repair of the electric users;
▪ protect the electric users, in particular the lights;
▪ assure a more effective lighting of the space under the awning;
▪ realize an articulated arm with cleaner lines.

The Applicant has found that the objectives indicated above and others besides can be achieved housing, when possible, the cables and the electric users inside the arm or otherwise protected by appropriate cover elements.
In particular, the object of the present invention is an articulated joint for arm awnings, comprising: an arm and a forearm; and articulated joint interposed between the arm and the forearm to connect them mutually; wherein the articulated joint defines a rotation axis; wherein the articulated joint comprises: a portion developing around the rotation axis and delimiting an annular housing oriented outwards; wherein the annular housing communicates with an inner cavity of the arm and with an internal cavity of the forearm to allow the passage of a power supply cable; a cover configured to close the annular housing with respect to the exterior; connecting devices between said portion and the cover configured to allow the application or the removal of the cover to/from said portion without further disassembling the arm.
In an independent aspect, an object of the invention is also an arm awning comprising at least one articulated arm described above and/or according to a least one of the claims and/or of the following aspects.
The Applicant has verified that the invention allows to protect the power supply cable or cables of the electric users mounted on the arm and at the same time to access said cable(s) in a very simple and fast manner to inspect them, maintain and/or repair the appliances and the cables.
Preferred, non-limiting aspects of the invention are listed below.
In one aspect, the articulated joint comprises a first part comprising a first plate and a second plate, integral with each other and axially distanced.
In one aspect, the articulated joint comprises a second part comprising a first plate and a second plate, integral with each other and axially distanced.
In one aspect, the first part is coupled to the second part to rotate around the rotation axis.
In one aspect, the first plate and the second plate of the first and of the second part are circular.
In one aspect, the first plate and the second plate of the first and of the second part are coaxial to the rotation axis.
In one aspect, the first plate and the second plate of the first part are located in an axially inner or axially outer position with respect to the first and second plate of the second part.
In one aspect, the portion developing around the rotation axis and delimiting the annular housing is obtained on the first plate and/or on the second plate of the first and/or of the second part.
In one aspect, the articulated joint comprises a pin that is coaxial to the rotation axis and inserted through the first part and the second part.
In one aspect, the annular housing surrounds the pin.
In one aspect, the connecting devices are magnetic. In one aspect, the connecting devices comprise a magnet borne by the cover and/or by the portion delimiting the annular housing. Magnetic devices are very practical because they allow a user to remove and reposition the cover easily and manually.
In a different aspect, the connecting devices comprise a screw or a fitting or a snap-on engagement. In one aspect, the connecting devices can be assembled and disassembled manually or by means of a tool.
In one aspect, when the arm is assembled, the cover is oriented downward, to allow an easy access. The cover can be easily and conveniently dismounted acting from below the awning.
In one aspect, the first part of the joint comprises a lug able to be inserted in a first tubular section. In one aspect, the arm comprises a first tubular section connected to the first part of the joint. In one aspect, the arm comprises the first part of the joint and the first tubular section.
In one aspect, the second part of the joint comprises a lug able to be inserted in a second tubular section. In one aspect, the arm comprises a second tubular section connected to the second part of the joint. In one aspect, the arm comprises the second part of the joint and the second tubular section.
In one aspect, the first part of the joint comprises a first passage communicating with the interior of the first tubular section and communicating with the annular housing.
In one aspect, the second part of the joint comprises a second passage communicating with the interior of the second tubular section and communicating with the annular housing.
In one aspect, the first tubular section has a dividing inner wall delimiting a main volume and an auxiliary conduit, preferably smaller in size than the main volume. In one aspect, the second tubular section has a dividing inner wall delimiting a main volume and an auxiliary conduit, preferably smaller in size than the main volume.
The auxiliary conduit is dedicated to the passage of one or more cables, protects them and keeps them in position.
In an independent aspect, the structure of the section with the dividing inner wall delimiting a main volume and an auxiliary conduit can be present even without the cover and the annular housing.
In one aspect, the first and/or the second auxiliary conduit is/are in communication with the annular housing, preferably through the first and/or the second opening. The annular housing and/or the first passage and/or the second passage and/or the auxiliary conduits are dedicated to the passage of at least one power supply cable.
In one aspect, the articulated arm comprises an electric user mounted or mountable on the forearm. In one aspect, the articulated arm comprises an electric user mounted or mountable on the forearm, preferably on the second tubular section. In one aspect, the articulated arm comprises an electric user mounted or mountable on the forearm, preferably on the first tubular section.
In one aspect, the articulated arm comprises a power cable connected or connectable to the electric user and passing through the arm and/or the forearm.
In one aspect, a portion of the power cable is disposed in the annular housing and around the rotation axis. In one aspect, said portion forms at least one turn in the annular housing. In one aspect, the length of said portion is such as to allow the passage of the articulated arm from a folded position (in which arm and forearm lie next to each other) to an extended position (in which arm and forearms are substantially aligned with respect to each other) without damaging the cable.
In one aspect, the electric user comprises at least one light source, preferably an array of lamps, preferably of LEDs.
In on aspect, the first and/or the second tubular section has/have a tapered cross section. In one aspect, the tubular section has an inclined lower outer wall. In one aspect, when the awning is in operation, a lower outer wall of the arm and/or the forearm is inclined downwardly and toward a central area of said awning. In one aspect, the light source is mounted at the inclined wall. In this way, light is addressed towards a central area under the awning, for better illumination.
In an independent aspect, the inclined wall can be present even without the cover and the annular housing and/or the auxiliary conduit.
In one aspect, an outer wall of the tubular section has an opening configured to house the light source, preferably the array of lamp. In one aspect, said opening is obtained by milling. In one aspect, said opening is elongated towards the longitudinal development of the tubular section. In one aspect, the opening opens in the auxiliary conduit. In one aspect, the opening is obtained in the inclined wall. In one aspect, the array of lamps is housed in the opening with the lamps oriented outwards. The lamps are at least partly protected inside the arm. Obtaining the opening by milling is simple and fast.
In an independent aspect, the opening can be present even without the cover and the annular housing and/or the auxiliary conduit and/or the inclined wall.
In one aspect, the arm has a first end provided with the first part of the articulated joint and a second end, opposite to the first, having an articulated connection and a fixed portion of the awning.
In one aspect, the forearm has a first end provided with the second part of the articulated joint and a second end, opposite to the first, and having elements for connecting to a crosspiece of the awning.
In one aspect, the articulated arm comprises at least one spring or other elastic element that connects the arm to the forearm and is positioned at least in part inside the first tubular section. The function of the spring is to hold the articulated arm in the extended position.
In one aspect, the elastic element has an end anchored to the forearm at the articulated joint and the opposite end anchored to the arm at the opposite end to that of the articulated joint.
In an independent aspect, the present invention also relates to a method for assembling the elastic element, comprising:

connecting a traction bar to a first end of the elastic element;
inserting the elastic element with the traction bar through the first part of the articulated joint and through the first tubular section until making the traction bar project from the second end of the arm;
fastening a second end of the spring, opposite to the first end, to the second end of the articulated joint;
pulling the traction bar to put under tension the elastic element until engaging an intermediate portion of the traction bar to the second end of the arm;
removing an excess portion of the traction bar projecting from the second end of the arm.

In one aspect, the traction bar has an engagement element (for example a slot or a hook) able to be fastened to the second end of the arm to engage said intermediate portion of the traction bar to the second end of the arm.
In one aspect, the traction bar has a weakened area, preferably narrowed, positioned at the engagement element, configured to facilitate the removal of the excess portion of the traction bar.
In one aspect, removing the excess portion comprises: breaking the traction bar at the weakened area, preferably bending the traction bar at said weakened area. This method facilitates the tensioning of the spring and its installation in the arm. Further features and advantages shall be more readily apparent from the detailed description of a preferred but non-limiting embodiment of an articulated arm for arm awnings according to the present invention.

Description of the drawings

Such description will be made herein below with reference to the accompanying drawings, provided for indicative purposes only and therefore not limiting, in which:

▪ Figure 1 shows an arm awning in a partially open configuration in which the two articulated arms are partially extended;
▪ Figure 2 shows one of the two articulated arms of the awning of Figure 1;
▪ Figure 3 shows an exploded view of the arm of Figure 2;
▪ Figure 4 shows a bottom view of a portion of the articulated arm of the preceding figures;
▪ Figure 5 shows an enlarged portion of the articulated arm of the preceding figures;
▪ Figure 6 shows the enlarged portion of Figure 5 from a different angle with the articulated arm substantially extended;
▪ Figure 7 shows the enlarged portion of Figure 5 from a different angle with the articulated arm bent;
▪ Figure 8 shows an element of the articulated arm of the preceding figures;
▪ Figure 9 shows the awning of Figure 1 from a different angle;
▪ Figure 10 shows additional elements of the articulated arm of the preceding figures; and
▪ Figure 11 is an enlargement of Figure 10.

Detailed description

With reference to the aforementioned figures, the reference numeral 1 designates in its entirety an awning with articulated arms provided with two articulated arms 2 in accordance with the present invention.
The awning 1 comprises a box 3 mounted on the wall P of a building. The box 3 is provided with a crosspiece 4. Each of the two articulated arms 2 has its own end fastened to the wall P by means of an articulated connection 5 (more visible in Figure 2) and elements of the box not shown in detail and an opposite end fastened to the crosspiece 4 by means of connecting elements 6 (more visible in Figure 2). An awning 7 is wound on a roller in the box 3 and it is fastened to the crosspiece 4.
The two articulated arms 2 are symmetrical, therefore only one of them will be described below.
The articulated arm 2 comprises an arm 8 and a forearm 9 connected to each other by an articulated joint 10.
The arm 8 has a first end provided with a first part 11 of the articulated joint 12 and a second end, opposite to the first, having the aforementioned articulated connection 5. The forearm 9 has a first end provided with a second part 12 of the articulated joint 11, and a second end, opposite to the first, having the connecting elements 6 to the crosspiece 4.
As is more visible in Figure 3, the first part of the articulated joint 10 comprises a first plate 13, a second plate 14 and a lug 15 constituted by a single body. The first plate 13 and the second plate 14 are circular, coaxial to a rotation axis "X" and axially distanced from each other. The lug 15 has a prevalent development along an orthogonal direction to the axis of rotation "X". The first plate 13 and the second plate 14 have holes that are coaxial to the rotation axis "X".
As is more visible in Figures 2 and 3, the second part of the articulated joint 12 comprises a first plate 16, a second plate 17 and a lug 18 constituted by a single body. The first plate 16 and the second plate 17 are circular, coaxial to a rotation axis "Y" and axially distanced from each other. The lug 18 has a prevalent development along an orthogonal direction to the axis of rotation "Y". The first plate 16 and the second plate 17 have holes that are coaxial to the rotation axis "Y".
When the articulated joint 10 is assembled, as in Figures 2, 4-7, the rotation axes "X", "Y" coincide and a pin 19 coaxial to the axis of rotation "X" or "Y" is inserted through in the holes of the plates to allow a relative rotation between the first and the second part 11, 12 around said rotation axis. Moreover, the first plate and the second plate 13, 14 of the first part 11 are located in an axially inner position with respect to the first and second plate 16, 17 of the second part 12. In other words, the first plate and the second plate 16, 17 of the second part 12 are contained between the first and the second plate 13, 14 of the first part 11.
The arm 8 further comprises a first tubular section 20 connected to the first part 11 of the joint 10. In particular, the lug 15 of the first part 11 is inserted and locked in the first tubular section 20. The arm 8 comprises a second tubular section 21 connected to the second part 12 of the joint 10. In particular, the lug 18 of the second part 9 is inserted and locked in the second tubular section 21.
The articulated joint 10 allows the relative motion between the arm 8 and the forearm 9 between an extended position of the arm 2 (Figures 2, 4 and 6) and a folded position (Figures 5 and 7).
As shown in Figure 8, the second tubular section 21 has a cross section that tapers downwards (when the arm 2 is assembled) so as to define an inclined lower outer wall 22. With reference to the orientation of Figure 8, the second tubular section 21 has an upper wall 23, two slightly curved lateral walls 24, 25 and the inclined lower outer wall 22 that mutually connects lower appendages of the two lateral walls 24, 25 and is inclined also with respect to the upper wall 23. The second tubular section 21 also has a dividing inner wall 26 delimiting a main volume 27 and an auxiliary conduit 28, preferably smaller in size than the main volume 27.
The first tubular section 20 is substantially identical to the second tubular section 21 that was just described (they may have different lengths).
In the inclined lower outer wall 22 of the second tubular section 21 is obtained an opening 29, preferably obtained by milling, which is elongated along the longitudinal development of the second tubular section 21 and opens in the auxiliary conduit 28.
Said opening 29 is configured to house a light source, preferably an array of led lamps, not shown, oriented inwardly.
In a variant not illustrated herein, the opening and the light source can also be mounted on the arm 8.
When the awning 1 is in operation, as shown in Figure 9, the inclined lower outer wall 22 and the lamp are inclined downwardly and toward a central area under said awning 1 and the light "L" is addressed towards a central area of the awning 1.
As is better visible in Figure 6, the first plate 13 of the first part 11 of the articulated joint 10 has a portion that develops around the rotation axis "X", "Y" and delimits an annular housing 30 oriented towards the exterior of the articulated joint 10. The annular housing 30 is a recess obtained in the first plate 13 and that develops around the pin 19.
As shown in Figures 4, 6 and 7, the first part 11 of the joint 10 comprises a first passage 31 communicating with the interior of the first tubular section 20 and communicating with the annular housing 30. Similarly (Figures 3 and 6) and the second part 12 of the joint 10 comprises a second passage 32 communicating with the interior of the second tubular section 21 and communicating with the annular housing 30.
The auxiliary conduit 28 of the first and of the second tubular section 20, 21, the annular housing 30 and the first and the second passage 31, 32 house a power supply cable 33 (Figures 6 and 7) which from the lamps runs along the articulated arm 2 to, for example, an electric power supply of the building.
Starting from the lamp positioned in the opening 29, the power supply cable 33 passes through the auxiliary conduit 28 of the second tubular section 21, enters the second passage 32, then the annular housing 30, where it forms a turn around the pin 19 and to the rotation axis "X", "Y" (figures 6 and 7), and then enters the first passage 31 and thence the auxiliary conduit 28 of the first tubular section 20. The length of the portion of the power supply cable 33 positioned in the annular housing 30 and arranged as a turn is such that the articulated arm 2 can move between a folded position (wherein arm 8 and forearm 9 lie next to each other, Figure 7) and an extended position (wherein arm 8 and forearm 9 are substantially aligned with respect to each other, Figure 6) without hindering said motion and without damaging the cable 33.
The articulated arm 2 according to the invention further comprises a cover 34 configured to close the annular housing 30 with respect to the outside.
Connecting devices 35, 36 are operatively interposed between the portion with the annular housing 30 and the cover 34 and are configured to allow the application or removal, preferably with bare hands, of the cover 34, without further disassembling the articulated joint 10 or other parts of the articulated arm 2.
In the illustrated embodiment, the connecting devices 35, 36 are magnetic and comprise a magnet or ferromagnetic material 35 brought to the cover 34, at a central portion of the cover 34, and ferromagnetic material or a magnet 36 positioned at the center of the annular housing 30. In other embodiments, not shown herein, the connecting devices can be of another type, for example they comprise a screw or a fitting or a snap-on engagement.
When the arm 2 is assembled, the cover 34 is oriented downward, to allow an easy access from underneath the awning 1.
As is shown in Figures 10 and 11, the articulated arm 2 comprises an elastic element 37 that connects the arm 8 and the forearm 9 to each other, is positioned at least in part inside the first tubular section 20 and serves the function of holding the articulated arm 2 in the extended position.
In the illustrated embodiment, the elastic element 37 is a helical spring that has an end connected to the second part 12 of the joint 12, by means of a strip or band 38 provided with a cylinder 39 housed in a seat, not shown, obtained in said second part 12. An opposite end of the spring 37 is anchored to the arm 8 at a terminal element 40 of said arm 8 opposite to that of the articulated joint 10, by means of a traction bar 41. The terminal element 40 is a part of the articulated connection 5.
In the embodiment of Figure 10, the traction bar 41 has a slot 42 that engages with a pin 43 integral with the terminal element 40 of the arm 8.
In particular, the traction bar 41 has an end connected to the spring 37, an opposite end configured to be engaged by a machinery that is able, by appropriately fastening the arm 2, to pull the spring 37 and elongate it, of an intermediate portion provided with the aforesaid slot 42 and a thinner weakened area 44 positioned at the slot 42.
The described structure allows to mount the spring 37 in the articulated arm 2 as detailed below.
A first end of the spring 37 is fastened to the traction bar 41 and a second end of the same spring 37 is fastened to the band 38. The traction bar 41 with the spring 37 and with the band 38 is inserted in the arm 8, i.e. through the first part 11 of the articulated joint 10, through the first tubular section 20 and also through the terminal element 40 until the traction bar 41 projects slightly from the second end of the arm 8.
The cylinder 39 is housed in the seat obtained in the second part 12 of the articulated joint 11.
The articulated arm 2 is locked and, through the aforementioned machinery that engages the traction bar 41, for example at an eyelet 45, the traction bar 41 is pulled, in contrast to the spring 37, extracting it in part from the arm 8 until bringing the slot 42 to the pin 43 and inserting said slot 42 on the pin 43 (as shown in Figure 10).
At this point, with the spring 37 installed and under tension, an excess portion of the traction bar 41 that projects from the second end of the arm 8 is bent at the weakened area 44 until breaking it. The excess portion is eliminated while the rest of the traction bar 41 remains in place as a component of the articulated arm 2.
In the embodiment of Figure 11, instead of the slot 42 that engages on the pin 43, a seat 46 is shaped in the terminal element 40 of the arm 8. Said seat is configured to house and lock, in contrast to the traction exerted by the spring 37, an edge 47 of the traction bar 41 proximate to the weakened area 44.

List of elements

1: awning with articulated arms
2: articulated arm
3: box
4: crosspiece
5: articulated connection
6: connecting elements
7: awning
8: arm
9: forearm
10: articulated joint
11: first part of the joint
12: second part of the joint
13: first plate first part
14: second plate first part
15: lug first part
16: first plate second part
17: second plate second part
18: lug second part
19: pivot pin
20: first tubular section
21: second tubular section
22: inclined lower outer wall
23: upper wall
24: lateral wall
25: lateral wall
26: dividing inner wall
27: main volume
28: auxiliary conduit
29: opening
30: annular housing
31: first passage
32: second passage
33: power supply cable
34: cover
35: magnet or ferromagnetic material
36: magnet or ferromagnetic material
37: elastic element
38: band
39: cylinder
40: terminal element
41: traction bar
42: slot
43: pin
44: weakened area
45: eyelet
46: seat
47: edge
P: wall
X, Y: rotation axes
L: light

Claims

Articulated arm for arm awnings, comprising:
an arm (8) and a forearm (9);

an articulated joint (10) interposed between the arm (8) and the forearm (9) to connect them mutually;

wherein the articulated joint (10) defines a rotation axis (X, Y);

wherein the articulated joint (10) comprises:
a portion extending around the rotation axis (X, Y) and delimiting a housing (30) facing outwardly of the joint; wherein the housing (30) communicates with an inner cavity of the arm (8) and with an inner cavity of the forearm (9) to allow the passage of a power cable (33);

a cover (34) configured to close the housing (30) with respect to the outside;

connecting devices (35, 36) between said portion and the cover (34) configured to allow the application or removal of the cover (34) to/from said

portion without further disassembling the arm (2);

characterized in that the housing (30) is an annular housing.
Articulated arm according to claim 1, wherein the connecting devices (35, 36) are magnetic.
Articulated arm according to claim 1 or 2, comprising:
an electric user mounted or mountable on the forearm (9);

a power cable (33) connected or connectable to the electric user and passing through the arm (8) and the forearm (9);

wherein a portion of the power cable (33) is disposed in the annular housing (30) and around the rotation axis (X, Y).
Articulated arm according to claim 1, 2 or 3, wherein the arm (8) and/or the forearm (9) comprise/s a tubular section (20, 21) comprising an inner partition (26) delimiting a main volume (27) and an auxiliary conduit (28) smaller in size than the main volume (27) and dedicated to the passage of the power cable (33); wherein said auxiliary conduit (28) is in communication with the annular housing (30).
Articulated arm according to one of the preceding claims, wherein the arm (8) and/or the forearm (9) comprise/s a tubular section (20, 21) having a tapered cross section so that when the awning is in operation, a lower outer wall (22) of the arm (8) and/or the forearm (9) is inclined downwardly and toward a central area of said awning.
Articulated arm according to claim 5 when it is dependent on 3, wherein the electric user comprises at least one light source, preferably a led array; wherein said light source is mounted on the inclined outer wall (22).
Articulated arm according to one of the preceding claims, wherein the arm (8) and/or the forearm (9) comprise/s a tubular section (20, 21); wherein an outer wall of the tubular section (20, 21) has an opening (29), preferably milled, configured to accommodate the light source.
Articulated arm according to claim 7 when it is dependent on 4, wherein the opening (29) opens into the auxiliary conduit (28).
Articulated arm according to claim 7 when it is dependent on 5, wherein the opening (29) is formed in the inclined wall (22).
Articulated arm according to claim 5, comprising:
an electric user mounted or mountable on the forearm (9);

a power cable (33) connected or connectable to the electric user and passing through the arm (8) and the forearm (9);

wherein the electric user comprises at least one light source, preferably a led array; wherein said light source is mounted on the inclined outer wall (22).
Method for assembling an elastic element of an articulated arm for arm awnings, wherein the articulated arm (2) is according to one of the claims from 1 to 10, wherein the articulated arm (2) further comprises at least one elastic element (37) connecting the arm (8) with the forearm (9) and positioned at least in part inside a first tubular section (20);
wherein the method comprises:
- connecting a traction bar (41) to a first end of the elastic element (37);

- inserting the elastic element (37) with the traction bar (41) through a first part of the articulated joint (10) and through the first tubular section (20) until making the traction bar (41) project from a second end of the arm (2);

- fastening a second end of the elastic element (37), opposite to the first end, to a second end of the articulated joint (10);

- pulling the traction bar (41) to put under tension the elastic element (37) until engaging an intermediate portion of the traction bar (41) to the second end of the arm (2);

- removing an excess portion of the traction bar (41) projecting from the second end of the arm (2).
Method according to claim 11, wherein removing the excess portion comprises: breaking the traction bar (41) at a weakened area (44), preferably bending the traction bar (41) at said weakened area (44).
Arm awning comprising at least one articulated arm (2) according to a least one of the claims from 1 to 10.