Folding supporting device for outdoor preaching

Abstract

The invention discloses a folding supporting device for outdoor preaching, and relates to the technical field of supporting, the folding supporting device comprises a base, the base is provided with main supporting plates symmetrically distributed along the base, the main supporting plates are rotatably connected with auxiliary supporting plates, the auxiliary supporting plates are supported on the adjacent main supporting plates in an upward rotating mode, and mounting frames are placed among all the main supporting plates; first notches which are symmetrically distributed along the mounting frame are formed in one side of the mounting frame, second notches which are symmetrically distributed along the mounting frame are formed in the two sides of the mounting frame, and the second notches are located on the inner sides of the adjacent first notches. The supporting device can be folded into a suitcase capable of containing the display panel only by pushing the mounting frame downwards and then swinging the auxiliary supporting plate downwards, the supporting device and the display panel can be packaged and lifted outdoors conveniently, and when the supporting device is used for supporting, the supporting device can be unfolded into a support capable of supporting the display panel only by pulling out the mounting frame upwards, so that the supporting device is convenient to use. Operation is easy and convenient, practicability is high, the protection box and the folding frame are integrated, and the equipment weight is reduced.

Description

Technical Field

[0001] This invention relates to the field of support technology, and more particularly to a folding support device for outdoor presentations. Background Technology

[0002] Outdoor promotional activities require panels with subtitle display functions. For outdoor activities with frequent changes in venue, a foldable support structure is needed to support quick storage and convenient carrying. This allows the equipment to be easily disassembled and stored when not in use, greatly improving portability and flexibility. Furthermore, the detachable display terminal adapts to technological advancements, reduces the obsolescence rate, and significantly enhances portability and flexibility.

[0003] Currently, the display panel and support frame are usually folded separately in a protective case. The support frame is then unfolded after the protective case is opened for use. However, in actual use, the overall equipment is quite heavy due to the inclusion of the protective case and folding frame. Furthermore, due to the size limitations of the protective case, the telescopic frame is generally short, making it impossible to adjust the display panel to a higher position. This affects the equipment's adaptability in different scenarios. Summary of the Invention

[0004] In order to overcome the above-mentioned technical shortcomings mentioned in the background art, the present invention provides a folding support device for outdoor presentations.

[0005] A folding support device for outdoor presentations includes a base, on which are arranged main support plates symmetrically distributed along the base. Secondary support plates are rotatably connected to the main support plates, and the secondary support plates rotate upwards to support adjacent main support plates. A mounting frame is placed between all the main support plates. A first notch symmetrically distributed along one side of the mounting frame is provided, and second notches symmetrically distributed along both sides of the mounting frame are provided. The second notches are located inside adjacent first notches. The mounting frame is provided with sliding rods symmetrically distributed along the mounting frame, and the sliding rods are threaded. A guide rod is fixedly connected to the secondary support plate. A fixing rod symmetrically distributed along the mounting frame is fixedly connected to the mounting frame. A guide plate is rotatably connected to the fixing rod. The guide rod swings through an adjacent first notch and contacts an adjacent guide plate. A first torsion spring is fixedly connected between the fixing rod and the adjacent guide plate. A screw is threadedly connected to the side of the secondary support plate closest to the base.

[0006] As a preferred embodiment of the present invention, the slide rod is slidably connected to the mounting bracket, and the main support plate is slidably connected to the base.

[0007] As a preferred embodiment of the present invention, it further includes a card holder corresponding to the slide rod, the card holder being slidably connected to the adjacent slide rod, the mounting frame having a card hole corresponding to the card holder, the card holder being inserted into the corresponding card hole of the mounting frame, a first spring being fixedly connected between the slide rod and the corresponding card holder, and a pusher being slidably connected inside the slide rod, the pusher engaging with the adjacent card holder through a wedge-shaped surface.

[0008] As a preferred embodiment of the present invention, when the screw is screwed into the slide bar, the screw contacts the corresponding pusher.

[0009] As a preferred embodiment of the present invention, it further includes second springs symmetrically distributed along the base, the second springs being fixedly connected to the base, and a pull rod being fixedly connected between adjacent second springs. The pull rod is slidably connected to the slide groove of the main support plate, and the pull rod is in contact with the bottom of the mounting frame.

[0010] As a preferred embodiment of the present invention, it further includes a first baffle corresponding to the sub-support plate, the first baffle being slidably connected to the corresponding sub-support plate, a wedge-shaped surface being provided on the side of the first baffle away from the base, a third spring being fixedly connected between the first baffle and the corresponding sub-support plate, adjacent first baffles being in contact with each other, and a second baffle being fixedly connected to the top of the mounting bracket.

[0011] As a preferred embodiment of the present invention, it further includes a locking block, which is slidably connected to the mounting bracket, the base limits the locking block, and a fourth spring is fixedly connected between the locking block and the mounting bracket.

[0012] As a preferred embodiment of the present invention, it further includes a slide symmetrically distributed along the base, the slide being slidably connected to the base, and a rotating frame symmetrically distributed along the slide being rotatably connected to the slide. The rotating frame is located inside the base, and a second torsion spring is fixedly connected between the rotating frame and the adjacent slide. At least one guide ring is fixedly connected to both the side of the sub-support plate near the base and the side of the slide near the rotating frame.

[0013] The beneficial effects of this invention are: This support device can be folded into a carrying case that can store the display panel simply by pushing the mounting bracket downwards and then swinging the secondary support plate downwards. This makes it easy to pack and carry the support device and the display panel together outdoors. When the support is in use, simply pull the mounting bracket upwards to unfold it into a bracket that can support the display panel. It is simple and convenient to operate, highly practical, and integrates the protective case and folding frame into one unit, reducing the weight of the equipment.

[0014] This support device uses a sliding screw to move the slide bar, main support plate, and auxiliary support plate on it to slide to the left and right sides relative to the mounting frame, thereby providing more stable left-right balanced support for the mounting frame.

[0015] This support device unlocks the sliding rod via a screw, ensuring that the main support plate and the secondary support plate can only move to both sides when the mounting frame moves upward to the top. This prevents the main support plate, the secondary support plate, and the guide rod from moving to both sides prematurely with the sliding rod, allowing the mounting frame to be pulled out smoothly.

[0016] In addition to the horizontal support and fixation by screws, this support device also provides vertical support and fixation to the mounting frame from the bottom by tie rods. This reduces the load on the screws and improves the stability of the mounting frame support, thereby enhancing the stability of the display panel support.

[0017] This support device seals the left and right sides and the top side of the device with first baffles on the left and right sides and second baffle on the top side, respectively, thereby providing stronger protection for the display panel on the mounting frame from multiple directions.

[0018] This support device limits the locking block by using the base, preventing the locking block from moving upwards, thus preventing the mounting bracket from moving upwards and preventing the mounting bracket from sliding upwards at will.

[0019] This support device is reinforced and fixed to the ground by fixing one end of the pull rope to the guide ring of the sub-support plate and the other end to the guide ring of the slide on the same side at an angle downwards. Then, windproof nails are inserted into the ground through the guide ring of the slide. In this way, the device can be strengthened and fixed to the ground to prevent it from being blown over by strong winds. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of the base, main support plate, and secondary support plate of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the main support plate, secondary support plate, and mounting frame of the present invention in their unfolded state.

[0023] Figure 4 A three-dimensional structural diagram of the main support plate, secondary support plate, and mounting frame of this invention.

[0024] Figure 5 A three-dimensional structural diagram of the screw, bracket, and first spring components of this invention.

[0025] Figure 6 A three-dimensional structural diagram of the slide bar, the card holder, the first spring, and the pusher of the present invention.

[0026] Figure 7 A three-dimensional structural diagram of the mounting bracket, pull rod, and second spring components of this invention.

[0027] Figure 8 A three-dimensional structural diagram of the components of the present invention, including the first baffle, the third spring, and the second baffle.

[0028] Figure 9 A three-dimensional structural diagram of the mounting bracket, locking block, and fourth spring of this invention.

[0029] Figure 10 A three-dimensional structural diagram of the invention's base, carriage, and rotating frame.

[0030] Figure 11 A three-dimensional structural schematic diagram of the carriage, rotating frame, second torsion spring, and guide ring of the present invention.

[0031] Wherein: 1-base, 2-main support plate, 3-secondary support plate, 4-mounting bracket, 401-first notch, 402-second notch, 5-slide rod, 6-guide rod, 7-fixed rod, 8-guide plate, 9-first torsion spring, 10-screw, 11-clip bracket, 12-first spring, 13-push bracket, 14-pull rod, 15-second spring, 16-first baffle, 17-third spring, 18-second baffle, 19-clamping block, 20-fourth spring, 21-slide bracket, 22-rotating bracket, 23-second torsion spring, 24-guide ring. Detailed Implementation

[0032] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0033] Example 1: A folding support device for outdoor presentations, such as... Figures 1-4 As shown, the system includes a base 1. Main support plates 2 are symmetrically distributed along the left and right sides of the base 1 on both the front and rear sides. A secondary support plate 3 is connected to the upper side of the main support plate 2 via a hinge shaft. The bottom of the secondary support plate 3 contacts the base 1. Sliding grooves are formed on the inner sides of both the main support plates 2 and the secondary support plates 3. The secondary support plate 3 rotates upwards and supports itself on the adjacent main support plate 2. At this time, the sliding grooves of the main support plate 2 and the adjacent secondary support plate 3 are on the same vertical line. A mounting frame 4 is placed between the four main support plates 2. First notches 401 are symmetrically distributed along the front and rear sides of the top left and right sides of the mounting frame 4. Second notches 402 are symmetrically distributed along the front and rear sides of the top and bottom left and right sides of the mounting frame 4. The second notches 402 are located inside the adjacent first notches 401. A series of symmetrically distributed grooves are formed at the bottom of the mounting frame 4. The slide rod 5 slides up and down along the grooves of the main support plate 2 and the secondary support plate 3. Threaded grooves are opened on both the front and rear sides of the slide rod 5. A guide rod 6 is fixedly connected to the upper side of the secondary support plate 3. When the mounting frame 4 moves upward, it contacts the guide rod 6. When the mounting frame 4 moves downward to reset, the guide rod 6 passes through the second notch 402 on the bottom and top sides of the mounting frame 4 in sequence. Fixed rods 7 are fixedly connected to the upper left and right sides of the mounting frame 4, which are symmetrically distributed along the front and rear of the mounting frame 4. A guide plate 8 is rotatably connected to the fixed rod 7. The guide rod 6 swings upward and passes through the adjacent first notch 401 before contacting the adjacent guide plate 8. A first torsion spring 9 is fixedly connected between the fixed rod 7 and the adjacent guide plate 8. A screw 10 is threadedly connected to the lower side of the secondary support plate 3. When the slide rod 5 moves upward to align with the screw 10, the screw 10 is turned so that the screw 10 enters the threaded groove of the slide rod 5.

[0034] The display panel for promotional purposes can be pre-installed on the mounting bracket 4 according to individual preference, and stored inside the device along with the mounting bracket 4. Thus, when moving the device outdoors, simply lift the main support plate 2 upwards to carry the device and display panel together to the destination. Upon arrival, the display panel can be removed and supported as follows, allowing for stable outdoor use of the display panel for relevant presentations: First, lower the device so that the base 1 is supported on the ground or other table surface. Then, pull the mounting bracket 4 upward. The mounting bracket 4 drives the sliding rod 5 to slide upward along the groove of the main support plate 2. The mounting bracket 4 moves the display panel mounted on it upward together. During the upward movement, the mounting bracket 4 contacts the guide rod 6 and pushes the secondary support plate 3 to swing upward around the hinge axis through the guide rod 6. The screw 10 swings upward with the secondary support plate 3. When the secondary support plate 3 swings to a certain angle, the guide rod 6 rotates to the first notch 401 corresponding to the mounting bracket 4. At this time, the guide rod 6 disengages from the mounting bracket 4 and begins to contact the guide plate 8. As the mounting bracket 4 continues to rise, it will further rotate the guide rod 6 through the guide plate 8, thereby driving the display panel mounted on it to move upward. The secondary support plate 3 swings further to support the top of the adjacent main support plate 2, so that the sliding groove of the adjacent main support plate 2 and the sliding groove of the secondary support plate 3 are on the same vertical line. As the guide plate 8 rotates further with the guide rod 6, the guide plate 8 will adaptively rotate downward relative to the secondary support plate 3, and the first torsion spring 9 will adaptively deform. Then, the mounting bracket 4 continues to drive the components on it to move upward. When the guide plate 8 moves upward away from the guide rod 6, the first torsion spring 9 resets and drives the guide plate 8 to rotate upward relative to the secondary support plate 3 to reset. When the sliding rod 5 moves upward to align with the screw 10, the mounting bracket 4 moves to the uppermost side. By tightening the screw 10, the sliding rod 5 can be fixed on the upper side of the secondary support plate 3 to achieve support and fixation of the mounting bracket 4.

[0035] After the presentation, loosen the screw 10 and push the mounting bracket 4 down to reset. During the reset process, the second notch 402 on the lower side of the mounting bracket 4 first passes down through the guide rod 6, and the second notch 402 on the upper side then passes down through the guide rod 6. The mounting bracket 4 drives the display panel to reset downward and retract into the main support plate 2. Finally, push the secondary support plate 3 to swing downward 180 degrees to reset, thus completing the folding and storage of the device and restoring it to its initial state.

[0036] In summary, this support device can be folded into a carrying case that can store the display panel simply by pushing the mounting bracket 4 downward and swinging the secondary support plate 3 downward. This makes it easy to pack and carry the support device and the display panel together outdoors. When the support is in use, simply pull the mounting bracket 4 upward to unfold it into a bracket that can support the display panel. The operation is simple and convenient, and it is highly practical. Furthermore, the protective case and the folding frame are integrated into one unit, reducing the weight of the equipment.

[0037] Example 2: Based on Example 1, such as Figure 5 and Figure 6 As shown, it also includes a bracket 11 corresponding to the slide rod 5. The bracket 11 is slidably connected to the adjacent slide rod 5. The slide rod 5 is slidably connected to the mounting frame 4. The main support plate 2 is slidably connected to the base 1. The mounting frame 4 has a corresponding card hole for the bracket 11. The bracket 11 is inserted downward into the corresponding card hole of the mounting frame 4. A first spring 12 is fixed between the slide rod 5 and the corresponding bracket 11. A pusher 13 is slidably connected inside the slide rod 5 in the front-back direction. The pusher 13 is pressed and engaged with the adjacent bracket 11 through a wedge-shaped surface. When the screw 10 is screwed into the threaded groove of the slide rod 5, the screw 10 contacts the corresponding pusher 13.

[0038] Initially, the slide rod 5 is fixed to the mounting frame 4 by the bracket 11, so that when the mounting frame 4 is pulled up, the slide rod 5 can slide upward along the groove of the main support plate 2. When the screw 10 is tightened, the screw 10 is inserted into the slide rod 5 and presses the pusher 13 to slide closer to the bracket 11. The pusher 13 presses the bracket 11 to slide towards the side that compresses the first spring 12, so that the bracket 11 is pulled out from the locking hole of the mounting frame 4, so that the slide rod 5 can slide left and right on the mounting frame 4. In this way, by turning the screw 10, the slide rod 5, the main support plate 2 and the secondary support plate 3 on it can be driven to slide to the left and right sides relative to the mounting frame 4, so as to provide more stable left and right balanced support for the mounting frame 4. When the screw 10 is turned to the middle to reset and then the screw 10 is loosened, the screw 10 no longer presses the pusher 13, and the first spring 12 resets and drives the bracket 11 to slide down and lock into the corresponding locking hole of the mounting frame 4.

[0039] Moreover, the present invention unlocks the slide bar 5 by means of screw 10, ensuring that the main support plate 2 and the secondary support plate 3 can only move to both sides when the mounting bracket 4 moves upward to the uppermost side. Before that, the slide bar 5 is fixed by the locking rod. In this way, the main support plate 2, the secondary support plate 3 and the guide rod 6 can be prevented from moving to both sides in advance with the slide bar 5, thereby avoiding the situation where the guide rod 6 cannot be aligned with the first notch 401 during the swinging process, so that the mounting bracket 4 can be pulled out smoothly.

[0040] like Figure 7 As shown, it also includes two sets of second springs 15 symmetrically distributed along the front and back of the base 1. The two sets of second springs 15 are located on the left and right sides of the base 1, respectively. The second springs 15 are fixed to the base 1. A pull rod 14 is fixed between adjacent second springs 15. The pull rod 14 is slidably connected to the groove of the main support plate 2. The top of the pull rod 14 contacts the bottom of the mounting bracket 4.

[0041] Initially, the second spring 15 is compressed due to the downward pressure of the mounting bracket 4 on the pull rod 14. As the mounting bracket 4 is pulled upward, the second spring 15 gradually returns to its original state, causing the pull rod 14 to slide upward along with the support frame. In this way, in addition to the horizontal support and fixation by the screw 10, the mounting bracket 4 is also vertically supported and fixed from the bottom by the pull rod 14, so as to reduce the load on the screw 10 and improve the stability of the support for the mounting bracket 4, thereby improving the stability of the support for the display panel.

[0042] Example 3: Based on Example 2, such as Figure 8 As shown, it also includes a first baffle 16 corresponding to the sub-support plate 3. The first baffle 16 is slidably connected to the corresponding sub-support plate 3. A wedge-shaped surface is provided on the top side of the first baffle 16. A third spring 17 is fixed between the first baffle 16 and the corresponding sub-support plate 3. Adjacent first baffles 16 are in contact with each other. A second baffle 18 is fixedly connected to the top of the mounting bracket 4. When the first baffle 16 swings upward with the sub-support plate 3, its wedge-shaped surface will contact the second baffle 18.

[0043] The left and right sides and the top side are sealed by the first baffle 16 on the left and right sides and the second baffle 18 on the top side, respectively, so as to provide stronger protection for the display panel on the mounting bracket 4 from multiple directions. The mounting bracket 4 can be pulled out by pulling the second baffle 18. When the sub-support plate 3 swings upward, it drives the first baffle 16 on it to move synchronously. During this process, the wedge-shaped surface of the first baffle 16 will contact the second baffle 18. At this time, the second baffle 18 squeezes the first baffle 16 and slides it towards the side of the compression third spring 17 to avoid the first baffle 16 being blocked by the second baffle 18, so that the sub-support plate 3 can not continue to swing upward. Finally, the two first baffles 16 on the left and right sides contact each other and block the two adjacent sub-support plates 3. When the second baffle 18 is pushed down, so that the second baffle 18 is separated from the first baffle 16, the third spring 17 returns to its original position. When the sub-support plate 3 swings downward, it drives the first baffle 16 on it to swing downward and return to its original position.

[0044] like Figure 8 and Figure 9 As shown, it also includes a locking block 19, which is slidably connected to the mounting bracket 4. The base 1 limits the locking block 19, and a fourth spring 20 is fixed between the rear side of the locking block 19 and the mounting bracket 4.

[0045] Initially, the base 1 first limits the locking block 19, preventing it from moving upward and thus preventing the mounting bracket 4 from moving upward, thus preventing the mounting bracket 4 from sliding upward at will. Before pulling the mounting bracket 4 out upward, the locking block 19 is pushed backward from the front through the gap between the main support plates 2. The fourth spring 20 is compressed, so that the base 1 no longer limits the locking block 19, and then the mounting bracket 4 can be pulled out upward.

[0046] like Figure 10 and Figure 11 As shown, it also includes a slide 21 symmetrically distributed along the left and right sides of the base 1. The slide 21 is slidably connected to the base 1. The outside of the slide 21 is rotatably connected to a rotating frame 22 symmetrically distributed along the front and back of the slide 21. The rotating frame 22 is located inside the base 1. A second torsion spring 23 is fixed between the rotating frame 22 and the adjacent slide 21. Two guide rings 24 are fixedly connected to the lower side of the sub-support plate 3. One guide ring 24 is fixedly connected to the outer end of the slide 21.

[0047] When it is necessary to fix this device to the ground using windproof nails and pull ropes, first pull the guide ring 24 on the slide 21 outwards, so that the slide 21, the rotating frame 22 and the second torsion spring 23 are pulled out of the base 1 as a whole. After the rotating frame 22 moves out of the base 1, the second torsion spring 23 resets and causes the rotating frame 22 to swing to a certain angle away from the adjacent slide 21, increasing the support area. After the sub-support plate 3 swings upwards by 180 degrees, the guide ring 24 on it swings to the upper side. Fix one end of the pull rope to the guide ring 24 of the sub-support plate 3, and fix the other end diagonally downwards to the guide ring 24 of the slide 21 on the same side. Then use windproof nails to pass through the guide ring 24 of the slide 21 and insert them into the ground. In this way, the device can be firmly fixed to the ground to prevent it from being blown over by strong winds.

[0048] Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A folding support device for outdoor public speaking, characterized in that: The system includes a base (1), on which are provided main support plates (2) symmetrically distributed along the base (1). The main support plates (2) are rotatably connected to secondary support plates (3). The secondary support plates (3) rotate upward and support the adjacent main support plates (2). A mounting frame (4) is placed between all the main support plates (2). A first notch (401) symmetrically distributed along the mounting frame (4) is opened on one side of the mounting frame (4). A second notch (402) symmetrically distributed along the mounting frame (4) is opened on both sides of the mounting frame (4). The second notch (402) is located inside the adjacent first notch (401). On the side, the mounting bracket (4) is provided with sliding rods (5) symmetrically distributed along the mounting bracket (4). The sliding rods (5) are threaded. The sub-support plate (3) is fixedly connected with a guide rod (6). The mounting bracket (4) is fixedly connected with a fixing rod (7) symmetrically distributed along the mounting bracket (4). The fixing rod (7) is rotatably connected with a guide plate (8). The guide rod (6) swings through the adjacent first notch (401) and then contacts the adjacent guide plate (8). The fixing rod (7) and the adjacent guide plate (8) are fixedly connected with a first torsion spring (9). The side of the sub-support plate (3) near the base (1) is threadedly connected with a screw (10).

2. The folding support device for outdoor presentations as described in claim 1, characterized in that: The slide bar (5) is slidably connected to the mounting bracket (4), and the main support plate (2) is slidably connected to the base (1).

3. The folding support device for outdoor presentations as described in claim 2, characterized in that: It also includes a card holder (11) corresponding to the slide rod (5), the card holder (11) is slidably connected to the adjacent slide rod (5), the mounting frame (4) has a card hole corresponding to the card holder (11), the card holder (11) is inserted into the corresponding card hole of the mounting frame (4), a first spring (12) is fixedly connected between the slide rod (5) and the corresponding card holder (11), and a pusher (13) is slidably connected inside the slide rod (5), the pusher (13) is pressed and engaged with the adjacent card holder (11) through a wedge-shaped surface.

4. The folding support device for outdoor presentations as described in claim 3, characterized in that: When the screw (10) is screwed into the slide bar (5), the screw (10) contacts the corresponding pusher (13).

5. A folding support device for outdoor public speaking as described in claim 4, characterized in that: It also includes a second spring (15) symmetrically distributed along the base (1), the second spring (15) is fixed to the base (1), and a pull rod (14) is fixed between adjacent second springs (15). The pull rod (14) is slidably connected to the groove of the main support plate (2), and the pull rod (14) is in contact with the bottom of the mounting bracket (4).

6. A folding support device for outdoor presentations as described in claim 5, characterized in that: It also includes a first baffle (16) corresponding to the sub-support plate (3), the first baffle (16) is slidably connected to the corresponding sub-support plate (3), the first baffle (16) has a wedge-shaped surface on the side away from the base (1), a third spring (17) is fixed between the first baffle (16) and the corresponding sub-support plate (3), adjacent first baffles (16) are in contact with each other, and a second baffle (18) is fixed to the top of the mounting bracket (4).

7. A folding support device for outdoor presentations as described in claim 6, characterized in that: It also includes a locking block (19), which is slidably connected to the mounting bracket (4), the base (1) limits the locking block (19), and a fourth spring (20) is fixed between the locking block (19) and the mounting bracket (4).

8. A folding support device for outdoor public speaking as described in claim 7, characterized in that: It also includes a slide (21) symmetrically distributed along the base (1), the slide (21) is slidably connected to the base (1), the slide (21) is rotatably connected to a rotating frame (22) symmetrically distributed along the slide (21), the rotating frame (22) is located in the base (1), and a second torsion spring (23) is fixed between the rotating frame (22) and the adjacent slide (21). At least one guide ring (24) is fixed to the side of the sub-support plate (3) near the base (1) and the side of the slide (21) near the rotating frame (22).

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