Short-wave direction-finding antenna capable of being rapidly unfolded

Abstract

The utility model belongs to the technical field of wireless communication, and particularly relates to a short-wave direction-finding antenna capable of being quickly unfolded, which comprises an antenna main body, and the antenna main body comprises a main rod, a plurality of antenna units, an unfolding unit and a lodging mechanism. The main rod is provided with a central disc and a first fixed disc, and is connected with a plurality of antenna units. The lodging mechanism is arranged at the lower end of the main rod and connected with the supporting pull rope. The unfolding unit comprises a driving assembly and a pulley assembly, the pulley assembly comprises a plurality of top pulleys, bottom pulleys and support arm pull ropes, one ends of the support arm pull ropes are connected with the top pulleys and the bottom pulleys, the other ends of the support arm pull ropes are connected with the antenna unit, the support arm pull ropes form a central pull rope, and the central pull rope is connected with the driving assembly; according to the antenna unfolding and folding device, rapid unfolding and folding are achieved in the mode that the driving assembly and the pulley assembly are matched, operation is easy, the working intensity of operators can be effectively reduced, the operation time during unfolding or folding can be saved, the influence of severe weather on the antenna is avoided, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of wireless communications, and in particular relates to a short-wave direction-finding antenna that can be rapidly deployed. Background Art

[0002] The shortwave antenna is a key factor influencing the effectiveness of shortwave communications. A good antenna can multiply or even exponentially increase a radio's effective radiated power. A variety of shortwave antennas are available, depending on the communication distance, communication direction (directional or omnidirectional), and power handling capacity. Wideband dipole antennas are currently the most widely used. These antennas offer low production costs and high radiation efficiency and communication quality.

[0003] Existing shortwave direction-finding antennas are mostly fixed, cannot be automatically and quickly deployed and retracted, and are cumbersome to operate, complicated to use, and not conducive to maintenance. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a shortwave direction-finding antenna that can be rapidly deployed, which solves the problems of the prior shortwave direction-finding antenna being cumbersome to deploy and retract, complicated to use, and difficult to repair and maintain.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is:

[0006] Provided is a shortwave direction-finding antenna that can be rapidly deployed, comprising an antenna body, the antenna body comprising a main pole, a plurality of antenna units connected to the main pole, a deployment unit, and a lodging mechanism;

[0007] The main pole is provided with a central plate and a first fixed plate. The central plate is provided above the first fixed plate and is connected to a plurality of antenna units. The falling mechanism is provided at the lower end of the main pole and is connected to the support rope.

[0008] The unfolding unit includes a driving assembly and a pulley assembly connected to the driving assembly. The pulley assembly includes several top pulleys, bottom pulleys and arm pull ropes. One end of the arm pull rope is connected to the top pulley and the bottom pulley, and the other end is connected to the antenna unit. Several arm pull ropes form a central pull rope, and the central pull rope is connected to the driving assembly.

[0009] The beneficial effects of adopting the above technical solution are as follows: the shortwave direction-finding antenna can be fixed at a specified position through the main pole, and under the action of the falling mechanism, the supporting rope can be pulled to make the main pole erect or fall, which is beneficial to the installation and maintenance of the shortwave direction-finding antenna, and has a small footprint, which reduces the production cost, and the supporting rope is fixed to the ground through the ground rivets, which can further improve the stability of the entire antenna and ensure that the antenna is stable and not tilted; when the shortwave direction-finding antenna needs to be deployed, the center rope can be tightened by the forward drive assembly, and the top pulley and the bottom pulley can be matched to each other. When the antenna is closed, the center rope is pulled by the force to pull the support arm rope, so that the support arm rope pulls up the support arm to a horizontal position, completing the rapid deployment of the shortwave direction-finding antenna; when it needs to be withdrawn, the drive assembly needs to be reversed to relax the center rope, and then with the help of the antenna unit's own gravity, the antenna can be quickly withdrawn in bad weather or during maintenance; the coordinated use of the deployment unit and the antenna unit facilitates the rapid deployment and withdrawal of the antenna, can prevent the impact of bad weather on the antenna, effectively improve the safety factor of the antenna, and extend its service life.

[0010] Furthermore, the driving assembly includes a winch, which is connected to the bottom pulley and the top pulley through a central pull rope.

[0011] The beneficial effects of adopting the above technical solution are: the center pull rope can be tightened by the forward rotation of the winch, and the center pull rope is pulled by force to pull the support arm pull rope, the support arm pull rope pulls up the support arm, and the support arm drives the antenna unit to a horizontal position, so that the antenna can be quickly deployed; and the center pull rope can be loosened by reversing the winch, so that the support arm droops horizontally, and the antenna is folded; and through the coordinated use of the winch and the pulley assembly, the operation is simple, the application range is wide, and it has better economic benefits and promotion value.

[0012] Furthermore, the falling mechanism includes a base and a second fixed base arranged above the base, the second fixed base is movably connected to the third fixed base, and a bottom pulley is arranged inside the second fixed base; the third fixed base is arranged at the bottom of the main rod.

[0013] The beneficial effect of adopting the above technical solution is that the movable connection between the second fixed base and the third fixed base facilitates the erection or falldown of the entire antenna through the support rope, which facilitates the installation and maintenance of the shortwave direction-finding antenna.

[0014] Furthermore, the plurality of antenna units include an antenna element and an antenna box connected to the antenna element, the antenna box is connected to one end of the second arm, the other end of the second arm is connected to the first arm, and the first arm is connected to the center disk.

[0015] The beneficial effects of adopting the above technical solution are: by connecting the antenna unit to the main pole through the first arm and the second arm, the signal reception range of the antenna when deployed can be expanded and the reception effect can be improved; and by using the arm pull rope connected to the central pull rope, the antenna can be quickly deployed and retracted, the operation is simple, and the labor intensity is reduced.

[0016] Furthermore, the first arm and the second arm are connected via a first connecting member, and the second arm and the antenna box body are connected via a second connecting member;

[0017] The first connecting member is provided with a plurality of first buckles, and the plurality of first buckles are connected to the first drawstring, the second drawstring and the third drawstring;

[0018] The second connecting member is provided with a plurality of second buckles, and the plurality of second buckles are connected to the fourth draw rope, the fifth draw rope and the sixth draw rope;

[0019] The first pull rope and the fourth pull rope are both connected to the support arm pull rope; the second pull rope and the fifth pull rope are both connected to the first fixed plate; the third pull rope is connected to the first connecting pieces adjacent to both sides of the third pull rope; and the sixth pull rope is connected to the second connecting pieces adjacent to both sides of the third pull rope.

[0020] The beneficial effects of adopting the above technical solution are: the first arm and the second arm can be connected by the first connecting member, and the second arm and the antenna unit can be fixedly connected by the second connecting member, which can expand the signal reception range when the antenna is deployed and improve the reception effect; and the adjacent arms and antenna units are connected by the third pull rope and the sixth pull rope respectively, so that each arm and the antenna unit can be connected as a whole, which facilitates the rapid deployment and retraction of the entire shortwave direction-finding antenna at the same time, effectively improving the deployment or retraction efficiency and reducing the intensity of manual work.

[0021] Furthermore, a fourth buckle is provided on the first fixed plate, and the fourth buckle is connected to the second pull rope and the fifth pull rope through the OC flower basket; the first pull rope and the fourth pull rope are both connected to the support arm pull rope through the OC flower basket.

[0022] Furthermore, the first ring buckle is connected to the first pull rope, the second pull rope and the third pull rope through a spring buckle; the second ring buckle is connected to the fourth pull rope, the fifth pull rope and the sixth pull rope through a spring buckle.

[0023] Furthermore, a second fixed plate is provided at the top end of the main rod, a plurality of first fixed bases are provided on the second fixed plate, and top pulleys are provided in the middle of the plurality of first fixed bases.

[0024] The beneficial effects of adopting the above technical solution are: the top pulley is fixed to the first fixed base by bolts, and each top pulley is connected to each antenna unit through the support arm pull rope, which can realize the simultaneous rapid deployment and retraction of the entire antenna, effectively improving the deployment or retraction efficiency and reducing the manual workload.

[0025] Furthermore, a third buckle is provided below the first fixed bases, and the third buckle is connected to the support rope.

[0026] The beneficial effects of adopting the above technical solution are: by pulling the support rope, the main pole can be erected or fallen down, which is conducive to the installation and maintenance of the shortwave direction-finding antenna, and the support rope is fixed to the ground through ground rivets, which can further improve the stability of the entire antenna and ensure that the antenna is stable and not tilted.

[0027] Furthermore, the central disk and the first arm are connected via a pin.

[0028] In summary, the rapidly deployable shortwave direction-finding antenna provided by the present invention has the following beneficial effects:

[0029] (1) The antenna in the present invention is easy to install, occupies a small area, is easy to maintain, and can be quickly deployed and retracted according to actual needs, which can effectively improve the safety factor of the antenna.

[0030] (2) The antenna in the present invention can be quickly deployed and retracted by cooperating with the drive assembly and the pulley assembly. The operation is simple, which can effectively reduce the workload of the operator and save the operation time when deploying or retracting, avoid the impact of bad weather on the antenna, and extend the service life.

[0031] (3) The antenna units in the present invention are fixed to each other through multiple groups of arms and pull ropes, and the antenna units and the main pole can be combined into a whole, which can not only expand the signal receiving range when the antenna is deployed and improve the receiving effect, but also realize the rapid deployment and retraction of the entire antenna at the same time, effectively improving the deployment or retraction efficiency.

[0032] (4) The antenna in the present invention is also provided with a falling mechanism. Through the cooperation between the falling mechanism and the supporting rope, the entire antenna can be erected or fallen down through the supporting rope, which is convenient for the installation and maintenance of the shortwave direction-finding antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural diagram of the utility model;

[0034] Figure 2 This is a schematic diagram of the connection between the pulley assembly and the main rod in the utility model;

[0035] Figure 3 This is a schematic structural diagram of the lodging mechanism in the present utility model;

[0036] Figure 4 It is a structural diagram of the expansion unit in the present utility model;

[0037] Figure 5 Schematic diagram of the structure of the antenna unit in the present invention;

[0038] Figure 6 This is a schematic structural diagram of the center disk in the utility model;

[0039] Figure 7 This is a schematic structural diagram of the first fixed disk in the present utility model;

[0040] Figure 8 Schematic diagram of the connection between the first arm and the second arm in the present invention;

[0041] Figure 9 This is a schematic diagram of the connection between the support arm and the antenna unit in the present invention;

[0042] Figure 10 This is a schematic structural diagram of the second connecting member in the present utility model;

[0043] Among them, 1. Antenna body; 2. Main rod; 21. Center plate; 22. First fixed plate; 221. Fourth buckle; 222. OC flower basket; 23. Second fixed plate; 231. First fixed base; 232. Third buckle; 3. Antenna unit; 31. Antenna vibrator; 32. Antenna box; 33. First support arm; 34. Second support arm; 35. First connecting piece; 351. First buckle; 352. First pull rope; 353. Second pull rope; 3 54. Third pull rope; 355. Spring buckle; 36. Second connecting piece; 361. Second ring buckle; 362. Fourth pull rope; 363. Fifth pull rope; 364. Sixth pull rope; 4. Falling mechanism; 41. Base; 42. Second fixed base; 43. Third fixed base; 5. Support pull rope; 6. Drive assembly; 61. Winch; 7. Pulley assembly; 71. Top pulley; 72. Bottom pulley; 73. Arm pull rope; 74. Center pull rope. DETAILED DESCRIPTION

[0044] The specific implementation methods of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific implementation methods. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all utility model creations using the concept of the present invention are protected.

[0045] like Figure 1As shown, the shortwave direction-finding antenna that can be quickly deployed provided by the present invention includes an antenna body 1, which includes a main pole 2, a plurality of antenna units 3 connected to the main pole 2, an deployment unit and a falling mechanism 4. A central disk 21 and a first fixed disk 22 are provided on the main pole 2. The central disk 21 is arranged above the first fixed disk 22 and is connected to the plurality of antenna units 3; the falling mechanism 4 is arranged at the lower end of the main pole 2 and is connected to the support rope 5; the shortwave direction-finding antenna can be fixed at a specified position through the main pole 2, and under the action of the falling mechanism 4, the support rope 5 can be pulled to make the main pole 2 erect or fall down, which is beneficial to the installation and maintenance of the shortwave direction-finding antenna, and occupies a small area, reduces the production cost, and the support rope 5 is fixed to the ground by ground rivets, which can further improve the stability of the entire antenna and ensure that the antenna is stable and not tilted; and the deployment unit can make the antenna unit 3 quickly deployed or retracted, which is beneficial to prevent the influence of bad weather on the antenna, effectively improve the safety factor of the antenna, and extend the service life.

[0046] like Figure 1 and Figure 4 As shown, the unfolding unit includes a driving assembly 6 and a pulley assembly 7 connected to the driving assembly 6, the pulley assembly 7 includes a plurality of top pulleys 71, a bottom pulley 72 and an arm pull rope 73, one end of the arm pull rope 73 is connected to the top pulley 71 and the bottom pulley 72, and the other end thereof is connected to the antenna unit 3, the plurality of arm pull ropes 73 form a central pull rope 74, the central pull rope 74 is arranged inside the main pole 2, and is connected to the driving assembly 6; the driving assembly 6 includes a winch 61, and the winch 61 is connected to the bottom pulley 72 and the top pulley 71 through the central pull rope 74.

[0047] When the shortwave direction-finding antenna needs to be deployed, the center pull rope 74 can be tightened by rotating the winch 61 forward. With the cooperation of the top pulley 71 and the bottom pulley 72, the center pull rope 74 is pulled by the support arm pull rope 73, so that the support arm pull rope 73 pulls the support arm to a horizontal position, completing the rapid deployment of the shortwave direction-finding antenna. The antenna expansion range after deployment is 10m, the total height of the entire antenna is 9.7m, and the center disk 21 is 6.5m above the ground. When it needs to be withdrawn, the winch 61 needs to be reversed to relax the center pull rope 74. With the help of the antenna unit 3's own gravity, the antenna can be quickly withdrawn in bad weather or during maintenance.

[0048] like Figure 1 and Figure 5As shown, several antenna units 3 include an antenna vibrator 31 and an antenna box body 32 connected to the antenna vibrator 31, the antenna box body 32 is connected to the second arm 34, one end of the second arm 34 is connected to the arm pull rope 73, and the other end is connected to the first arm 33, and the first arm 33 is connected to the center disk 21; the antenna vibrator 31 and the antenna box body 32 are connected by a threaded connection, and the antenna unit 3 is connected to the main pole 2 through the first arm 33 and the second arm 34, which can expand the signal receiving range of the antenna when it is deployed and improve the receiving effect; and the arm pull rope 73 connected to the center pull rope 74 can realize rapid deployment and retraction of the antenna, which is simple to operate and reduces the intensity of manual work.

[0049] like Figure 1 and Figure 3 As shown, the falling mechanism 4 includes a base 41 and a second fixed base 42 arranged above the base 41. The second fixed base 42 is movably connected to the third fixed base 43, and a bottom pulley 72 is provided inside it. The bottom pulley 72 and the second fixed base 42 are connected by screws; the third fixed base 43 is arranged at the bottom of the main pole 2; through the movable connection between the second fixed base 42 and the third fixed base 43, it is convenient to erect or fall down the entire antenna through the support rope 5, which is convenient for the installation and maintenance of the shortwave direction-finding antenna.

[0050] like Figure 1 and Figure 2 As shown, a second fixed plate 23 is provided at the top of the pole, and several first fixed bases 231 are provided on the second fixed plate 23, and top pulleys 71 are provided in the middle of several first fixed bases 231; and third ring buckles 232 are provided below several first fixed bases 231, and the third ring buckle 232 is connected to the support rope 5 through a spring buckle 355; the top pulley 71 is fixed to the first fixed base 231 by bolts, and each top pulley 71 is respectively connected to each antenna unit 3 through a support arm rope 73, which can realize the simultaneous rapid deployment and retraction of the entire antenna, effectively improve the deployment or retraction efficiency, and reduce the manual labor intensity; and by pulling the support rope 5, the main pole 2 is erected or fallen, which is beneficial to the installation and maintenance of the shortwave direction-finding antenna, and the support rope 5 is fixed to the ground by ground rivets, which can further improve the stability of the entire antenna and ensure that the antenna is stable and not tilted.

[0051] like Figure 1 and Figure 6 As shown, the center disk 21 and the first arm 33 are connected by a pin, such as a connection method in which a cotter pin cooperates with the pin, which has a simple structure and is easy to install and disassemble.

[0052] In the embodiment of the present utility model, Figure 8 and Figure 9As shown, the first arm 33 and the second arm 34 are connected by a first connecting member 35, and the first connecting member 35 is fixedly connected to the first arm 33 and the second arm 34 by open blind rivets; and a plurality of first buckles 351 are provided on the first connecting member 35, and the first buckle 351 is connected to the first pull rope 352, the second pull rope 353 and the third pull rope, and the first pull rope 352, the second pull rope 353 and the third pull rope are connected to the first buckle 351 through a spring buckle 355.

[0053] like Figure 1 、 Figure 8 and Figure 9 As shown, the second arm 34 is connected to the antenna box body 32 via a second connecting member 36. Figure 10 As shown, a plurality of second buckles 361 are provided on the second connecting member 36, and the second buckles 361 are connected to the fourth pull rope 354, the fifth pull rope 363 and the sixth pull rope 364, and the second buckles 361 are connected to the fourth pull rope 354, the fifth pull rope 363 and the sixth pull rope 364 through spring buckles 355.

[0054] In addition, the first pull rope 352 and the fourth pull rope 354 are both connected to the support arm pull rope 73; the second pull rope 353 and the fifth pull rope 363 are both connected to the first fixed plate 22; the third pull rope is connected to the first connecting piece 35 adjacent to it on both sides; the sixth pull rope 364 is connected to the second connecting piece 36 adjacent to it on both sides; the first support arm 33 and the second support arm 34 can be connected through the first connecting piece 35, and the second support arm 34 and the antenna unit 3 can be fixedly connected through the second connecting piece 36, which can expand the signal receiving range when the antenna is deployed and improve the receiving effect; and the adjacent support arms and antenna units 3 are respectively connected through the third pull rope and the sixth pull rope 364, so that each support arm and the antenna unit 3 can be connected as a whole, which facilitates the rapid and simultaneous deployment and retraction of the entire shortwave direction-finding antenna, effectively improving the deployment or retraction efficiency and reducing the manual workload.

[0055] like Figure 7 and Figure 9 As shown, a fourth buckle 221 is provided on the first fixing plate 22, and the fourth buckle 221 is connected to the second pull rope 353 and the fifth pull rope 363 through the OC basket 222; the first pull rope 352 and the fourth pull rope 354 are both connected to the support arm pull rope 73 through the OC basket 222.

[0056] The working method of the present invention is as follows: first, assemble the antenna according to the antenna structure and the connection relationship between the various parts. After the first assembly of the antenna is completed, the center rod is used to adjust the balance of the support arm to ensure that the support arm is in a horizontally extended state. At this time, the main rod 2 is connected to the falling mechanism 4 set at the specified position. After the connection is completed, the support rope 5 is pulled to make the main rod 2 drive the antenna to a vertical position and then fixed with a ground rivet; when it is necessary to withdraw, the winch 61 needs to be reversed to make the center rope 74 in a relaxed state, and then with the help of the antenna unit 3's own gravity, the antenna can be quickly withdrawn in bad weather or during maintenance and repair; and when the shortwave direction-finding antenna needs to be deployed, the center rope 74 can be tightened by the forward-rotating winch 61. Under the cooperation of the top pulley 71 and the bottom pulley 72, the center rope 74 is forced to pull the support arm rope 73, so that the support arm rope 73 pulls up the support arm to a horizontal position, completing the rapid deployment of the shortwave direction-finding antenna, without the need to adjust the rope again, effectively improving the antenna deployment efficiency.

[0057] In summary, the rapidly deployable shortwave direction-finding antenna provided by the present invention is simple and quick to install, occupies a small actual area, is easy to maintain, and can be quickly deployed and retracted according to actual needs, which can effectively improve the safety factor of the antenna.

Claims

1. A shortwave direction-finding antenna that can be rapidly deployed, characterized in that: The antenna body (1) comprises a main pole (2), a plurality of antenna units (3) connected to the main pole (2), an unfolding unit and a falling mechanism (4); The main pole (2) is provided with a central disk (21) and a first fixed disk (22), wherein the central disk (21) is arranged above the first fixed disk (22) and is connected to a plurality of antenna units (3); the falling mechanism (4) is arranged at the lower end of the main pole (2) and is connected to a supporting pull rope (5); The unfolding unit comprises a driving assembly (6) and a pulley assembly (7) connected to the driving assembly (6); the pulley assembly (7) comprises a plurality of top pulleys (71), a bottom pulley (72) and an arm pull rope (73); one end of the arm pull rope (73) is connected to the top pulley (71) and the bottom pulley (72), and the other end is connected to the antenna unit (3); the plurality of arm pull ropes (73) form a central pull rope (74), and the central pull rope (74) is connected to the driving assembly (6).

2. The rapidly deployable shortwave direction-finding antenna according to claim 1, characterized in that: The driving assembly (6) comprises a winch (61), and the winch (61) is connected to a bottom pulley (72) and a top pulley (71) via a central pull rope (74).

3. The rapidly deployable shortwave direction-finding antenna according to claim 1, characterized in that: The falling mechanism (4) comprises a base (41) and a second fixed base (42) arranged above the base (41); the second fixed base (42) is movably connected to a third fixed base (43) and a bottom pulley (72) is arranged inside the third fixed base (43); the third fixed base (43) is arranged at the bottom of the main rod (2).

4. The rapidly deployable shortwave direction-finding antenna according to claim 1, characterized in that: The plurality of antenna units (3) comprise an antenna vibrator (31) and an antenna box body (32) connected to the antenna vibrator (31); the antenna box body (32) is connected to one end of a second arm (34); the other end of the second arm (34) is connected to a first arm (33); and the first arm (33) is connected to a central disk (21).

5. The rapidly deployable shortwave direction-finding antenna according to claim 4, characterized in that: The first support arm (33) and the second support arm (34) are connected via a first connecting member (35), and the second support arm (34) and the antenna box body (32) are connected via a second connecting member (36); The first connecting member (35) is provided with a plurality of first buckles (351), and the plurality of first buckles (351) are connected to the first pull rope (352), the second pull rope (353) and the third pull rope; The second connecting member (36) is provided with a plurality of second ring buckles (361), and the plurality of second ring buckles (361) are connected to the fourth pull rope (354), the fifth pull rope (363) and the sixth pull rope (364); The first pull rope (352) and the fourth pull rope (354) are both connected to the support arm pull rope (73); the second pull rope (353) and the fifth pull rope (363) are both connected to the first fixed plate (22); the third pull rope is connected to the first connecting piece (35) adjacent to the two sides thereof; and the sixth pull rope (364) is connected to the second connecting piece (36) adjacent to the two sides thereof.

6. The rapidly deployable shortwave direction-finding antenna according to claim 5, characterized in that: A fourth ring buckle (221) is provided on the first fixed plate (22), and the fourth ring buckle (221) is connected to the second pull rope (353) and the fifth pull rope (363) through the OC flower basket (222); the first pull rope (352) and the fourth pull rope (354) are both connected to the support arm pull rope (73) through the OC flower basket (222).

7. The rapidly deployable shortwave direction-finding antenna according to claim 5, characterized in that: The first ring buckle (351) is connected to the first pull rope (352), the second pull rope (353) and the third pull rope via a spring buckle (355); the second ring buckle (361) is connected to the fourth pull rope (354), the fifth pull rope (363) and the sixth pull rope (364) via a spring buckle (355).

8. The rapidly deployable shortwave direction-finding antenna according to claim 1, characterized in that: A second fixed plate (23) is arranged at the top end of the main rod (2), a plurality of first fixed bases (231) are arranged on the second fixed plate (23), and a top pulley (71) is arranged in the middle of the plurality of first fixed bases (231).

9. The rapidly deployable shortwave direction-finding antenna according to claim 8, characterized in that: A third ring buckle (232) is arranged below the first fixed bases (231), and the third ring buckle (232) is connected to the supporting pull rope (5).

10. The rapidly deployable shortwave direction-finding antenna according to claim 1, characterized in that: The central disk (21) and the first support arm (33) are connected via a pin.

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