SUPPORT AND POSITION ADJUSTMENT DEVICE FOR AN ANTENNA

Abstract

 Support and position adjustment device for an antenna, comprising a base releasably mountable on a surface, a connecting member extending parallel to a first axis, having a first end connected to the base so as to define a movement of rotation of the connection element with respect to the base about the first axis, and extending said connection element up to a second end, on which a first hole is made parallel to a second axis transverse to the first axis; the position support and adjustment device, further comprising an antenna support on which a second hole is made, and said antenna support having at least a section of perimeter surface on which a cavity is made which extends radially into the antenna support housing the second end of the connection element, and including a pin inserted axially inside the first and second holes, rotatably connecting the antenna support to the connection element, said pin being axially mobile along the second axis and shaped in such a way as to have a retracted position defining a condition of release of the support device and adjustment of the position, in which the pin is disengaged from the first hole and a radial clearance is defined between said pin and said first hole, so as to implement the rotation of the antenna support about the first axis and to the second axis; and such pin being movable in such a way to have an advanced position defining a locking condition of the support device and position adjustment, where in the pin is engaged in the first hole closing the radial clearance between said pin and said first hole in such a way to cause blocking of the rotation of the antenna support about the first axis and the second axis..

Description

TECHNICAL FIELD

[0001] The present invention refers to a support and position adjustment device for an antenna, in particular to a device having a double joint mechanism for position adjustment for an antenna, preferably in naval applications.

STATE OF ART

[0002] In naval applications, the use of antennas is widespread for a wide variety of purposes, e.g. navigation control and maritime traffic control, calling rescue services or communicating with ports. However, some types of antennas used in naval applications, e.g. the two-way VHF/UHF (very high frequency/ultra high frequency) transceiver antennas receive and transmit radio signals according to a preferential polarization since the radiation intensity is greater in some directions and lower in others. For this reason, these antennas are positioned in the highest areas of boats, e.g. on the roof or on the highest deck, preferably free from interference such as bulkhead poles or pylons, in order to minimize the presence of interference between the emitting and receiving sources as much as possible. Furthermore, in most vessels these antennas are mounted on support devices. Since the direction of maximum emission/reception of the signal can vary depending on the installation polarization, and in the case of a moored boat it can also depend on the orientation for the specific parking position, there are support devices and position adjustment, e.g. of the single or double joint type, through which it is possible to adjust the position of an antenna according to various inclinations.

[0003] However, the devices currently on the market provide a limited number of position adjustment positions, and above all 2 rotation axes rigidly placed at 90 degrees to each other, so for example it may not be possible to position the antenna in an optimal direction of emission/reception of the signal, or to have a limited number of antenna removal positions such as to allow its removal when its use is not required in an area preferred by the operator, e.g. when the vessel is in port, if in the space around the antenna there are objects which the antenna would collide with once knocked down or protrude into passage areas which would obstruct or create danger. Furthermore, in most existing solutions on the market there is a lever through which to lock/unlock the antenna position adjustment mechanism. However, the presence of this lever turns out to be a potential danger for users on the boat, as it is a protruding part with which a user could accidentally hook, e.g. with clothing, or impact, especially when there is limited space on the boat or even when the irregular movement of the sea makes the users' balance unstable.

[0004] It is therefore an always felt need, especially in naval applications, to create compact and ergonomic solutions, limiting as much as possible the presence of protruding parts with which users can come into contact, and which at the same time are sufficiently robust and provide greater flexibility in the positions of adjustment of the position of an antenna, as boats especially nowadays have an aerodynamic shape and therefore with surfaces that are almost never flat with multiple inclinations.

PURPOSE AND BRIEF DESCRIPTION OF THE INVENTION

[0005] The present invention aims at satisfying at least in part the needs indicated above, wherein this purpose is achieved by means of a support and position adjustment device for an antenna, according to claim 1.

[0006] In particular, such device comprises a base, e.g. a plate, releasably mountable on a surface e.g. the roof of a boat. Preferably, said base is made of stainless metallic material so as to resist corrosion and sea salt, but it can be made of other materials e.g. plastics, titanium, aluminium. Furthermore, such device comprises a connection element which extends longitudinally along a first axis arranged transversely and preferably perpendicular to the base. According to one aspect of the invention, the connection element has a first end connected in a rotatable manner to the base, so as to achieve a relative rotational movement of the connection element with respect to the base around the first axis. Furthermore, the connection element has a second end opposite the first end, on which a first hole is made parallel to a second transverse axis and preferably perpendicular to the first axis. Preferably, the first hole has at least one section of converging profile that extends from one of the two ends of the first hole of the connection element.

[0007] According to a preferred embodiment of the present invention, the support and position adjustment device further comprises an antenna support, preferably in the shape of a spherical segment with two bases, on which the antenna is mounted in use. In particular, a second hole is made on the antenna support parallel to the second axis, and along at least one section of the perimetral surface a cavity is made transversely and preferably perpendicular to the second axis. In particular, such cavity extends radially into the antenna support so as to house the second end of the connection element in use. According to an aspect of the present invention, the antenna support is rotatably connected to said second end by means of a pin arranged longitudinally inside the first and second holes, so as to be able to achieve a relative rotational movement of the antenna support with respect to the connecting element about the second axis.

[0008] According to a preferred embodiment of the present invention, the support and position adjustment device comprises a spacer element interposed between the base and the antenna support, said spacer element having a first face facing the antenna support side and a second face facing the part of the base. In particular, such first face has a recessed surface on which a third hole is made parallel to the first axis through which a portion of the connection element extends. Furthermore, such recessed surface defines in use a seat for engaging the second end of the connection element in such a way as to constrain the antenna support and the spacer element to rotation with respect to the first axis.

[0009] According to a preferred embodiment of the present invention, the base has a raised surface facing towards the antenna support. In particular, on said relieved surface a first recess is created parallel to the first axis which houses the spacer element, said spacer element having a second face facing the side of the base on which a second knurled or rough toothed ring nut configured in use is made for engaging with a first toothed ring arranged on a bottom surface of the first recess when the position support and adjustment device is in a locked condition. In this way, it is possible to block in use any rotational movements of the antenna support with respect to the plate around the first axis when the device is in a blocked condition.

[0010] According to one aspect of the present invention, the pin is axially movable along the second axis so as to define a lock/unlock condition of the position of the support device and position adjustment. In particular, the pin is shaped in such a way as to be mobile between a retracted position defining a condition of unlocking the support device and adjustment of the position in which the pin is disengaged from the first hole of the connection element, and an advanced position defining a locking condition of the support device and adjustment of the position in which the pin is engaged in the first hole of the connection element. According to the invention, the geometric characteristics of the pin are exploited to create the locking/unlocking configuration of the support and position adjustment device. According to a preferred embodiment of the present invention, the pin has a first and a second profile section included between the two end portions of the pin, wherein said first and second profile sections preferably present at least one converging profile section. In particular, in an unlocked condition, the pin has the first section arranged inside the first hole of the connection element. In this configuration, each cross section of the first section has a smaller diameter than the diameter of the corresponding cross section of the first hole, thus defining a radial clearance condition between the pin and the first hole. In this way, thanks to the presence of the radial play, it is possible to translate the antenna support longitudinally away from the base in such a way as to disengage the surface portions of the plate and the support in contact and rotate the antenna support around the first axis. Still in this release configuration, the antenna support can perform a second relative rotation movement with respect to the connection element around the second axis, since the presence of the cavity on the antenna support allows rotation with respect to the connection element without interfering with the latter. Therefore, it is possible to position the antenna in a desired position by implementing the first or second rotation, or both rotations of the antenna support, thus being able to keep the antenna in a vertical position regardless of the inclination of the surface on which the device support and position adjustment is mounted. Once the desired position has been reached, the antenna support is translated longitudinally towards the base in such a way as to create contact between a portion of the surface of the base and the antenna support. In a blocked condition, the pin has the second profile section arranged inside the first hole of the connection element. In this configuration, the surfaces of the second section of the pin contact the surfaces of the first hole, creating an interference condition, e.g. a conical coupling, eliminating the radial play present between the pin and the first hole. The absence of radial play causes the translation movement of the antenna support along the first axis to be blocked, and consequently prevents the rotation of the latter around the first axis. Furthermore, the interference condition due to the absence of radial play also constrains the relative rotational movement of the antenna support with respect to the connection element around the second axis, thus preventing the rotation of the antenna support with respect to the first and second axis.

BRIEF DESCRIPTION OF THE FIGURES

[0011] The structural and functional characteristics of the support and position adjustment device for an antenna can be better understood from the detailed description that follows, wherein reference is made to the attached figures which represent a preferred and non-limiting embodiment, in which:

• Fig.1 shows an exploded view of the support and position adjustment device for an antenna;
• Fig.2 shows an axonometric view of the support and position adjustment device for an antenna;
• Fig.3 shows a sectional view of the support and position adjustment device for an antenna in a block configuration;
• Fig.4 shows a sectional view of the support and position adjustment device for an antenna in an unlocked configuration;
• Fig.5a shows a view of the connection element highlighting the hollow profile;
• Fig.5b shows a sectional view of the connection element.

DETAILED DESCRIPTION OF THE INVENTION

[0012] According to a preferred embodiment of the present invention, an exploded view of a support and position adjustment device for an antenna 1 comprising a base 10 is shown in Fig.1, e.g. a plate, mountable in a releasable manner, e.g. by means of screws inside holes made along the perimeter of the base, on a surface A (not shown in the figure), e.g. the roof of a boat. Preferably, base 10 is made of stainless metallic material so as to resist attack by corrosion and sea salt, but it can be made of other materials e.g. plastics, titanium, aluminium. Base 10 has a first surface 11 (not visible in the figure) which in use is in contact with the surface A, and a second surface 12 opposite first surface 11.

[0013] According to a preferred embodiment of the present invention, surface 12 has a raised surface portion 12a, preferably substantially shaped like a truncated pyramid, on which a first recess 14 is made parallel to a first axis R1 transverse to base 10. Preferably, first recess 14 has a circular cross section. Furthermore, first recess 14 has a bottom surface 15 on which a through hole 13 is made parallel, and preferably concentrically, to the first axis R1. Furthermore, a portion of bottom surface 15, e.g. a portion of the circular crown surface presents a profile shaped in such a way as to define a first toothed ring nut 16. Preferably, base 10 has a second recess 17 shown in Fig. 3 and 4 made on surface 11, which extends parallel and preferably concentrically with respect to first recess 14.

[0014] According to a preferred embodiment of the present invention shown in Fig.1, support and position adjustment device for an antenna 1 further comprises a connection element 20 rotatably connected to base 10. In particular, connection 20 includes a stem 21 which extends axially along first axis R1, said connection element 20 in use having a portion of stem 21 which extends inside through hole 13 in such a way as to have a first end 22 arranged in the second recess 17. Furthermore, connection element 20 has a second end 23, opposite first end 22 with respect to base 10, on which a first hole 24 is made along a second axis R2 transverse, and preferably perpendicular, to first axis R1. Preferably, first end 22 of connection element 20 has a threaded profile so as to be able to connect connection element 20 to base 10 by means of a nut 25 and preferably a washer 26 on said first end 22. In this way, the presence of nut 25 on the side of first surface 11 prevents connection element 20 from being disconnected from base 10 when a traction movement is carried out such as to move connection element 20 away from base 10. Furthermore, as shown in Fig .5a and 5b, stem 21 has a section of hollow profile 27 which extends longitudinally from first end 22 defining a first opening 27a up to a second opening 27b made transversally to first axis R1 on a section of the surface of stem 21 on the side of second end 23. In this way, it is possible to exploit hollow profile 27 in use e.g. for the passage of a cable (not shown in the figure) for the connection of the antenna to the receiving and/or transmitting device in such a way that said cable does not come out and passes internally to base 10 to avoid creating the risk of accidental contact with users on board the vessel.

[0015] According to a preferred embodiment of the present invention, as shown in Fig.5a first hole 24 is made in such a way as to have a first section of profile T1, preferably converging, which extends from one of the two openings of first hole 24 up to a second section of profile T2, preferably cylindrical, the latter extending up to the other opening of first hole 24. According to a preferred embodiment of the present invention shown in Fig.1, the position support and adjustment device 1 further comprises an antenna support 30 rotatably connected to the second end 23 of the connection element 20. Preferably, antenna support 30 has a substantially spherical segment profile with two bases on which a second hole 31 is made parallel to the second axis R2. Furthermore, as shown in Fig.2, antenna support 30 has at least a section of perimeter surface on which a cavity 32 is made transversely and preferably perpendicular to second axis R2. Such cavity 32 extends radially into antenna support 30, presenting an angular extension with respect to first axis R1 e.g. 100 degrees. In particular, cavity 32 divides through hole 31 into a first hole portion 31a and a second hole portion 31b. In this way, a space is defined inside antenna support 30 in which it is possible to insert and house the second end 23 of connection element 20, so as to be able to connect said second end 24 to antenna support 30. To connect antenna support 30 to connection element 20, the position support and adjustment device 1 includes a pin 40 which is inserted longitudinally inside first and second holes 24, 31 so as to create a rigid connection to rotation with respect to first axis R1 between connection element 20 and antenna support 30. Furthermore, on an apical area of antenna support 30 a protrusion 34 extends parallel and preferably concentrically to first axis R1, having said protrusion 34 at least a profile partly threaded on which an antenna (not shown in the figure) can be mounted. Furthermore, this projection 34 has a hole 35 which extends parallel to first axis R1 up to cavity 32 defining an opening 36 facing cavity 32, through which opening 36 it is possible to pass the antenna cable inside antenna support 30 through cavity 32. In this way, the passage of the cable internally to antenna support 30 reduces the exposure of the cable both from attacks by atmospheric agents and from accidental contact with a user.

[0016] Preferably, antenna support 30 has along at least one peripheral surface section, e.g. a section adjacent to each base of the spherical segment with two bases defining the shape of antenna support 30, a first pair of toothed surfaces 38 in an opposite position with respect to cavity 32. In particular, this first pair of toothed surfaces 38 extends at least along the surface section of antenna support 30 on which cavity 32 is made.

[0017] According to a preferred embodiment of the present invention, as shown in Fig.1, position adjustment device 1 further comprises a spacer element 50 interposed between base 10 and antenna support 30. In particular, spacer element 50 is in use housed in first recess 14 of base 10, and has a first face 50a facing the side of antenna support 30 and a second face 50b facing the side of base 10. In particular, first face 50a has a recessed surface 51 on which a through hole 52 is made parallel, and preferably concentrically, to first axis R1, into which a portion of stem 21 of connection element 20 extends. Furthermore, such recessed surface 51 defines a seat for engagement of second end 23 of connection element 20 in such a way as to create a rotationally rigid connection between antenna support 30 and spacer element 50 with respect to first axis R1. Furthermore, first face 50a presents along its edge a pair of raised surfaces opposite to first axis R1 and parallel to the first pair of toothed surfaces 38 on antenna support 30. In particular, each surface of this pair of raised surfaces is shaped in such a way as to define a second pair of toothed surfaces 53, and has a profile such as to engage with at least a portion of the teeth of the first pair of toothed surfaces 38 to block in use any rotational movements of the antenna support with respect to the plate around the second axis when the position support and adjustment device 1 is in a locked condition. Furthermore, on second face 50b there is a second toothed ring nut 54 configured to engage with first toothed ring nut 16 to block in use any rotation movements of the antenna support with respect to the plate around the first axis when support and position adjustment device 1 is in a blocked condition.

[0018] According to a preferred embodiment of the present invention shown in Fig.1, pin 40 is axially mobile along second axis R2 and has two end portions stably engaged inside second hole 31. In particular, pin 40 comprises a first portion of pin 40' and a second portion of pin 40" rigidly connected to each other by means of a screw 40". As shown in Fig.3 and 4, first pin portion 40' is engaged at least partly inside hole portion 31a, while the second pin portion 40" is engaged at least partly inside hole portion hole 31b in such a way that pin 40 and antenna support 30 are rigidly connected to the rotation with respect to second axis R2. In particular, first portion of pin 40' has a preferably cylindrical profile on which a through hole is made parallel to second axis R2. The second portion of pin 40" instead has a shaped profile which includes a first section P1 arranged for use on the side of the first portion of pin 40'. In particular, such first section P1 extends from the end of the second portion of pin 40" and preferably presents in succession a cylindrical profile and a converging profile which extends up to a second section P2 included between first section P1 and the end of the second portion of pin 40" opposite to first section P1. Furthermore, such second section P1 is shaped in such a way as to define a radial clearance condition G with a corresponding cross-section of first hole 24 of connection element 20 when pin 40 is in an axial position such that section P1 is arranged in first hole 24. Furthermore, on the end of first section P1 a hole is made, preferably blind, parallel to second axis R2 and concentric with the through hole on first portion of pin 40', so that screw 40‴ can be inserted inside the holes on the first and second hole portions 40', 40" to rigidly constrain them. Furthermore, the second section P2 preferably presents in succession a cylindrical profile and a converging profile shaped in such a way as to have surfaces which in use contact the surfaces of first hole 24 of the connection element 20 when pin 40 is in an axial position such that the section P2 is arranged in first hole 24, defining a coupling condition by interference between the surfaces of pin 40 and first hole 24, e.g. conical coupling.

[0019] According to the invention, the geometric characteristics of pin 40 are exploited to create a lock/unlock configuration of the rotation movement of antenna support 30 with respect to first and second axes R1, R2. In this way, it is possible to adjust the position of the antenna using an ergonomic solution that does not include protruding parts that a user could accidentally impact. In particular, as shown in Fig.4, in an unlocked condition, pin 40 is arranged in a retracted position so as to have the first section P1 arranged inside first hole 24 of connection element 20. In this configuration, each cross section of first section P1 has a smaller diameter than the diameter of the corresponding cross section of first hole 24, while inside hole portions 31a, 31b of antenna support 30 pin 40 remains stably engaged. Consequently, radial clearance G resulting between the surfaces of pin 40 and first hole 24 defines a condition of disengagement of pin 40 from connection element 20, such as to be able to translate antenna support 30 longitudinally together with spacer element 50 along first axis R1, moving them away from base 10. Such translation movement causes both the disengagement of second toothed ring nut 54 of spacer element 50 from first toothed ring nut 16 of base 10 and the disengagement of the first pair of toothed surfaces 38 of antenna support 30 by second pair of toothed surfaces 53 of spacer element 50. In this way, it is possible to rotate antenna support 30 about first axis R1 until reaching a desired angular position and without causing variations in the overall dimensions of the antenna in the surrounding space. The construction configuration of support and position adjustment device 1 allows antenna support 30 to assume any angular position with respect to first axis R1, antenna support 30 being able to perform a complete rotation about said first axis R1. In this configuration, antenna support 30 can also perform a second relative rotation movement with respect to connection element 20 about second axis R2. In particular, the angular variation of the position of antenna support 30 is defined by the angular extension of cavity 32. In particular, the presence of the cavity 32 allows the antenna support 30 to rotate with respect to the connection element 20 without interfering with the latter during the rotation movement. In this way, reaching the desired position through the combination of rotations a the rotations bout first and second axes R1, R2 allows the antenna to be kept in a vertical position regardless of the inclination of the surface on which the support and position adjustment device 1 is mounted. Advantageously, reaching the desired position by combining the rotations also allows to have a plurality of directions for lowering the antenna, without therefore having to mount the device in such a way that the antenna does not interfere with other devices in the surrounding area, when knocked down. When it is positioned in the desired angular position with respect to first and second axes R1, R2, antenna support 30 is translated along axis R1 towards base 10. Preferably, this translation movement causes the engagement of second toothed ring nut 54 of spacer element 50 on first toothed ring nut 16 of base 10. This condition of engagement blocks in use any relative rotation movements of antenna support 30 with respect to base 10 about first axis R1. Preferably, the axial movement of antenna support 30 towards base 10 also causes a condition of engagement between the first pair of toothed surfaces 38 of antenna support 30 and the second pair of toothed surfaces 53 of spacer element 50, so as to be able to angularly maintain position of antenna support 30 with respect to base 10 before implementing the locking configuration of pin 40. Furthermore, once antenna support 30 has been positioned in a desired angular position, it is possible to implement the locking configuration of pin 40, in such away as to block the rotation movements of antenna support 30 with respect to first and second axes R1, R2. In particular, as shown in Fig.3, in the blocked condition, pin 40 is arranged in an advanced position so as to have second section P2 engaged inside first hole 24 of connection element 20. In this configuration, the surfaces of second section P2 contact the surfaces of first hole 24, creating an interference condition between the respective surfaces, e.g. a conical coupling, eliminating radial play G between pin 40 and first hole 24. In this way, the absence of radial play G prevents antenna support 30 from being translated along first axis R1 and from rotating it about first axis R1. Furthermore, this interference condition also constrains the relative rotation movement of antenna support 30 with respect to connection element 20 about second axis R2, so that the position support and adjustment device remains blocked in the fixed position.

[0020] According to a further embodiment of the present invention, on the end of cavity 32 arranged on the side of projection 34, a third opening 37 is made configured in such a way as to keep it blocked, e.g. by interference, the connection cable of the antenna to the receiving and/or transmitting apparatus when said cable passes through cavity 32. In particular, when the antenna is mounted on support 30, the connection cable to the receiving and/or or transmitter enters first opening 27a on stem 21 passing through hollow profile 27 and is connected to the antenna passing through cavity 32 of support 30 once it exits second opening 27b of the stem. In particular, inside cavity 32 such cable passes around the second end 23 of connection element 20 and, after having been connected to the antenna, is kept in position in a condition of interference created between the cable and third opening 37. In this way, when support 30 rotates about second axis R2, it is possible to exploit the entire angular extension of cavity 32 to perform the rotation, the cable remaining blocked in third opening 37 without occupying the space of cavity 32.

[0021] According to a further preferred embodiment of the present invention, the pin is threaded and can be advanced by rotation of a knob from a retracted position in which the position adjustment and support device for an antenna is in the unlocked condition, to an advanced position in which the position support and adjustment device is in the unlocked condition. Preferably, to implement the longitudinal movement of pin 40, it is possible to use a rotating lever configured to actuate a cam which causes the longitudinal movement of pin 40 between the retracted position and the forward position respectively for unlocking and locking the support device and position adjustment.

Claims

1. Support and position adjustment device for an antenna (1), comprising a base (10) releasably mountable on a surface (A), a connection element (20) extending parallel to a first axis (R1), having a first end (22) connected to the base (10) so as to define a rotational movement of the connection element (20) with respect to the base (10) around the first axis (R1), and said connection element (20) extending up to a second end (23), on which a first hole (24) is made parallel to a second axis (R2) transversal to the first axis (R1); the support and position adjustment device (1), further comprising a support of an antenna (30) on which a second hole (31) is made, and said support of an antenna (30) having at least a portion of perimeter surface on which a pocket (32) is made extending radially in the support of an antenna (30) housing the second end (23) of the connection element (20), and comprising a pin (40) inserted axially inside the first and second holes (24, 31) by rotatably connecting the support of an antenna (30) to the connection element (20), said pin (40) being axially movable along the second axis (R2) and shaped so as to have a retracted position defining a released condition of the support and position adjustment device (1), wherein the pin (40) is disengaged from the first hole (24) and a radial clearance (G) is defined between said pin (40) and said first hole (24), so as to actuate the rotation of the support of an antenna (30) around the first and the second axis (R1, R2); and such pin (40) being movable so as to have an advanced position defining a blocked condition of the support and position adjustment device (1), wherein the pin (40) is engaged in the first hole (24) closing the radial clearance (G) between said pin (40) and said first hole (24) so as to block the rotation of the support of an antenna (30) around the first and the second axis (R1, R2).

2. Support and position adjustment device for an antenna (1) according to claim 1, wherein one of the pin (40) and the first hole (24) has a converging profile configured to engage with a contact profile of one of the pin (40) and the first hole (24) when the support and position adjustment device is in a blocked condition.

3. Support and position adjustment device for an antenna (1) according to one of the preceding claims, comprising a spacer element (50) interposed between the base (10) and the support of an antenna (30), said spacer element having a first face (50a) facing towards the support of an antenna (30) and a second face (50b) facing towards the base (10), said first face (50a) having a recessed surface (51) on which a third hole (52) is made parallel to the first axis (R1) through which a portion of the connection element (20) extends, said recessed surface (51) defining in use an engagement seat of the second end (23) of the connection element (20) so as to provide a rigid connection between the support of an antenna (30) and the spacer element (50) with respect to the first axis (R1).

4. Support and position adjustment device for an antenna (1) according to claim 3 , wherein the base (10) has a projecting surface (12a) facing towards the support of an antenna (30) on which a first recess (14) is made parallel to the first axis (R1) housing the spacer element (50), being formed on the second face (50b) a second toothed ring (54) configured in use to engage with a first toothed ring (16) arranged on a bottom surface (15) of the first recess (14) when the support and position adjustment device (1) is in a blocked condition.

5. Support and position adjustment device for an antenna (1) according to claim 3 or 4, wherein the first face (50a) of the spacer element (50) has a second pair of toothed surfaces (53) disposed on opposite sides of the first axis (R1) and parallel to a first pair of toothed surfaces (38) formed on the support of an antenna (30) on opposite sides of the pocket (32), said first pair of toothed surfaces (38) extending at least along the portion of the perimeter surface on which the pocket (32) is made, and said second pair of toothed surfaces (53) having a profile to engage with at least one portion of the toothing of the first pair of toothed surfaces (38) when the position adjustment device (1) is in a blocked condition.

Drawing