Optical instrument fixing mechanism

Abstract

The utility model discloses an optical instrument fixing mechanism, including support frame and telescope, be connected with mounting bracket and be equipped with on the support frame, the elastic plate is fixedly arranged on the mounting bracket outer wall, the elastic plate is provided with multiple sets and is clamped in the telescope outer wall, the top of multiple elastic plates is fixedly equipped with fixed plate, is equipped with the jack -plug in multiple fixed plates all, is equipped with the plug -in rod in multiple jack -plugs, the plug -in rod top is equipped with the fixed sleeve, the fixed sleeve outer wall is equipped with the sliding block and slides, the sliding block is provided with multiple sets and is fixedly equipped with the clamping block in the top, the plug -in rod outer wall is equipped with the clamping groove, the top of multiple sliding blocks is fixedly equipped with the pusher, the fixed sleeve outer wall is equipped with the movable slot, the quick connection mechanism of plug -in rod and fixed sleeve, has replaced the conventional complicated thread fastening mode, makes the operating personnel even in the harsh weather condition or dark environment also can easily complete the installation, has improved the equipment deployment efficiency of field operation significantly, provides solid guarantee for capturing the observation opportunity of fleeting.

Description

Technical Field

[0001] This utility model relates to the field of optical instrument technology, and more specifically, to an optical instrument fixing mechanism. Background Technology

[0002] In applications requiring frequent movement and rapid deployment, such as astronomical observation, field research, and military reconnaissance, the efficiency of installing and dismantling optical equipment directly impacts work progress and observation quality. Existing methods for fixing observation equipment mostly employ traditional threaded fastening designs, requiring operators to repeatedly rotate and adjust bolts or nuts to complete installation. This method is difficult and time-consuming in adverse weather conditions or dark environments. Furthermore, after prolonged use, the threads are prone to wear or corrosion, leading to unstable connections or jamming. This fails to meet the practical needs of rapid equipment deployment in field operations, severely impacting observation efficiency and the accuracy of observation results.

[0003] As optical technology develops towards higher precision and multifunctionality, professional observation activities place higher demands on the speed of equipment transfer and ease of operation. Especially in the instantaneous capture of astronomical events and emergency observation tasks, the unlocking and disassembly process of traditional fixed devices often requires the assistance of special tools, and the disassembly steps are cumbersome. In low-temperature or high-temperature environments, it is difficult for operators to perform delicate operations while wearing gloves. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides an optical instrument fixing mechanism to solve the technical problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: an optical instrument fixing mechanism, including a support frame and a telescope. A mounting frame is connected to the support frame. An elastic plate is fixed to the outer wall of the mounting frame. Multiple sets of elastic plates are arranged and clamped to the outer wall of the telescope. A fixing plate is fixed to the top of each set of elastic plates. Insertion holes are formed on each set of fixing plates. Insertion rods are inserted into the insertion holes. A fixing sleeve is inserted to the top of each insertion rod. A slider is slidably provided on the outer wall of the fixing sleeve. Multiple sets of sliders are arranged, and each slider has a locking block fixed to its top. A locking groove is formed on the outer wall of the insertion rod. A push block is fixed to the top of each set of sliders. A movable groove is formed on the outer wall of the fixing sleeve. Multiple movable grooves are arranged and slidably connected to multiple sets of push blocks. A limiting sleeve is formed on the outer wall of the fixing sleeve. An installation block is fixed to the outer wall of the limiting sleeve. Multiple sets of installation blocks are arranged, and each mounting block has an arc-shaped rod fixed to its outer wall. A rotating sleeve is rotatably provided on the outer wall of the fixing sleeve. A limiting rod is fixed to the top surface of the rotating sleeve. Multiple sets of limiting rods are arranged, and each limiting rod has a limiting hole on its outer wall.

[0008] The present invention is further configured such that push springs are connected between the inner walls of the multiple sets of push blocks and the movable grooves. The push springs are provided in multiple sets. This design enables the push blocks to be automatically pushed out when unlocking, achieving quick disassembly. At the same time, the setting of multiple sets of push springs ensures uniform pushing force, improving the reliability and stability of unlocking.

[0009] The present invention is further configured such that a sliding hole is provided in the insertion rod, a compression spring is connected in the sliding hole, and a top block is connected to the top of the compression spring. The top block slides in the sliding hole. This structural design allows the insertion rod to automatically pop out with the help of the spring force after unlocking, without the need for manual removal, which greatly simplifies the disassembly operation and improves the efficiency of equipment transfer.

[0010] The present invention is further configured such that a guide plate is fixedly provided on the inner wall of the limiting sleeve, and a guide groove is provided on the outer wall of the fixed sleeve. Multiple sets of the guide plate and the guide groove are provided and slidably connected. This design ensures that the limiting sleeve can only slide along the predetermined track without rotating, thus ensuring accurate positioning during the locking and unlocking process and improving the operational stability of the overall mechanism.

[0011] The present invention is further provided with soft pads between the multiple sets of fixing plates. The soft pads can buffer external vibrations and evenly distribute pressure, effectively protecting the telescope from mechanical damage, while improving the stability and comfort of clamping, and ensuring the imaging quality of the optical system.

[0012] The present invention is further configured such that the bottom surface of the rotating sleeve is provided with a slide bar, and multiple sets of slide bars are distributed on the bottom surface of the rotating sleeve. Each set of slide bars is slidably provided with a clamping block, and multiple sets of clamping blocks are provided with tension springs connected to their inner walls. A fixing ring is fixedly provided on the outer wall of the fixed sleeve, and a positioning block is provided on the top surface of the fixing ring. Multiple sets of positioning blocks are provided, and positioning grooves are opened on the top surface of each set of clamping blocks. This structure realizes precise positioning and segmented control of the rotating sleeve, allowing the operator to clearly perceive each unlocking stage, preventing misoperation or excessive rotation, and enhancing the human-machine interaction experience of the entire mechanism.

[0013] The present invention is further configured such that all of the multiple sets of positioning blocks and positioning grooves are arc-shaped. The arc-shaped design makes the contact between the clamping block and the positioning block smoother and reduces wear. At the same time, it enhances the smoothness of the rotation process and extends the service life of the mechanism.

[0014] The present invention is further configured such that baffles are fixedly provided on the outer walls of the multiple sets of slide bars, and the multiple sets of baffles abut against the inner walls of the multiple sets of clamping blocks respectively. The baffles limit the movement range of the clamping blocks, prevent the clamping blocks from detaching from the slide bars, ensure the stability and reliability of the positioning system, and avoid the risk of failure caused by loose or detached parts.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides an optical instrument fixing mechanism, which has the following beneficial effects:

[0017] 1. The optical instrument fixing mechanism adopts an innovative elastic clamping structure and plug-in connection design, which perfectly solves the problem of rapid telescope installation in scenarios such as astronomical observation and field research. The combination of elastic plate and soft pad forms a uniform ring support system, which can not only gently and steadily clamp the telescope, but also effectively absorb vibration interference during the observation process, ensuring the imaging stability of the optical system. The quick connection mechanism of plug rod and fixing sleeve replaces the traditional cumbersome threaded fastening method, allowing operators to easily complete the installation even in bad weather conditions or dark environments, significantly improving the equipment deployment efficiency in field operations and providing a solid guarantee for capturing fleeting observation opportunities.

[0018] 2. The coordinated operation of the limiting sleeve and the guiding system further enhances the accuracy and stability of the locking, enabling the fixed structure to maintain good working condition even under extreme temperature conditions. This automatic locking mechanism does not require additional adjustment operations, greatly simplifying the installation process. Even operators wearing thick gloves can easily complete the fixing, providing more reliable equipment support for professional optical observation.

[0019] 3. The ingenious combination of the rotating sleeve and the limiting rod simplifies the complex unlocking process into a simple rotational action, which can be completed without any auxiliary tools. The design of the arc-shaped positioning block and positioning groove, combined with the elastic positioning of the tension spring, achieves precise control and segmented positioning during the unlocking process, effectively preventing misoperation. The automatic pop-out mechanism driven by the compression spring allows the insertion rod to automatically disengage after unlocking without manual removal, greatly improving the equipment transfer speed and ease of operation. This user-friendly quick disassembly design perfectly meets the urgent need of modern optical observation for efficient equipment transfer, providing an ideal solution for instantaneous capture of astronomical events and emergency observation tasks, while ensuring the safety and stability of precision optical instruments during frequent disassembly and assembly. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an optical instrument fixing mechanism according to the present invention;

[0021] Figure 2 This is a schematic diagram of the disassembly structure of the insertion rod and the fixing sleeve in this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the fixing sleeve in this utility model;

[0023] Figure 4This is a partial structural diagram of the positioning block and positioning groove in this utility model;

[0024] Figure 5 This is a cross-sectional view of the fixing sleeve and the insertion rod in this utility model.

[0025] In the diagram: 1. Support frame; 2. Telescope; 3. Mounting frame; 4. Elastic plate; 5. Fixing plate; 6. Insertion hole; 7. Insertion rod; 8. Fixing sleeve; 9. Slider; 10. Locking block; 11. Locking groove; 12. Push block; 13. Movable groove; 14. Limiting sleeve; 15. Mounting block; 16. Arc rod; 17. Rotating sleeve; 18. Limiting rod; 19. Limiting hole; 20. Push spring; 21. Sliding hole; 22. Compression spring; 23. Top block; 24. Guide plate; 25. Guide groove; 26. Soft pad; 27. Sliding strip; 28. Clamping block; 29. ​​Tension spring; 30. Fixing ring; 31. Positioning block; 32. Positioning groove; 33. Baffle. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] Please see Figures 1-5An optical instrument fixing mechanism includes a support frame 1 and a telescope 2. A mounting frame 3 is connected to the support frame 1. An elastic plate 4 is fixed to the outer wall of the mounting frame 3. Multiple sets of elastic plates 4 are arranged and clamped to the outer wall of the telescope 2. A fixing plate 5 is fixed to the top of each set of elastic plates 4. Each set of fixing plates 5 has an insertion hole 6. An insertion rod 7 is inserted into the insertion hole 6. A fixing sleeve 8 is inserted to the top of the insertion rod 7. A slider 9 is slidably arranged on the outer wall of the fixing sleeve 8. Multiple sliders 9 are arranged, and each has a locking block 10 fixed to its top. The outer wall of the insertion rod 7 has an opening There is a slot 11, and multiple sets of sliders 9 are each fixedly provided with push blocks 12 at their top ends. The outer wall of the fixed sleeve 8 is provided with a movable groove 13. Multiple sets of movable grooves 13 are provided and are slidably connected to multiple sets of push blocks 12. The outer wall of the fixed sleeve 8 is provided with a limiting sleeve 14. The outer wall of the limiting sleeve 14 is fixedly provided with an installation block 15. Multiple sets of installation blocks 15 are provided and each has an arc rod 16 fixedly provided on its outer wall. The outer wall of the fixed sleeve 8 is rotatably provided with a rotating sleeve 17. The top surface of the rotating sleeve 17 is fixedly provided with a limiting rod 18. Multiple sets of limiting rods 18 are provided and each has a limiting hole 19 on its outer wall.

[0030] Multiple sets of push blocks 12 are connected to the inner wall of the movable groove 13 with push springs 20. There are multiple sets of push springs 20. The push springs 20 provide the restoring force for the push blocks 12. When the limiting sleeve 14 releases its contact with the push blocks 12, the push springs 20 automatically push the push blocks 12 to slide along the movable groove 13, so that the locking block 10 is disengaged from the locking groove 11, thereby realizing the automatic unlocking function.

[0031] The insertion rod 7 has a sliding hole 21 inside, and a compression spring 22 is connected inside the sliding hole 21. A top block 23 is connected to the top of the compression spring 22. The top block 23 slides inside the sliding hole 21. When the insertion rod 7 is inserted into the fixing sleeve 8, the top block 23 is compressed, which causes the compression spring 22 to store energy. When unlocking, the compression spring 22 releases energy to push the top block 23, so that the insertion rod 7 automatically pops out from the fixing sleeve 8 and the insertion hole 6, achieving rapid disengagement.

[0032] The inner wall of the limiting sleeve 14 is fixedly provided with a guide plate 24, and the outer wall of the fixed sleeve 8 is provided with a guide groove 25. Multiple sets of guide plates 24 and guide grooves 25 are provided and slidably connected. The guide plate 24 slides in the guide groove 25 to ensure that the limiting sleeve 14 can only move along the predetermined track and will not rotate, thus ensuring accurate positioning and smooth movement during the locking process.

[0033] Each of the multiple sets of fixing plates 5 is provided with a soft pad 26. The soft pad 26 plays a role in buffering and shock absorption. On the one hand, it protects the surface of the telescope 2 from being directly squeezed and damaged by the fixing plate 5. On the other hand, it absorbs the vibration during the observation process and ensures the stability of the optical system.

[0034] The bottom surface of the rotating sleeve 17 is provided with a slide bar 27, and multiple sets of slide bars 27 are distributed on the bottom surface of the rotating sleeve 17. Clamping blocks 28 are slidably provided on each set of slide bars 27. Multiple sets of clamping blocks 28 are provided, and tension springs 29 are connected to their inner walls. A fixing ring 30 is fixedly provided on the outer wall of the fixed sleeve 8. A positioning block 31 is provided on the top surface of the fixing ring 30. Multiple sets of positioning blocks 31 are provided. Positioning grooves 32 are opened on the top surface of each set of clamping blocks 28. This structure forms a segmented control mechanism. Under the action of the tension springs 29, the clamping blocks 28 are engaged with the positioning blocks 31, so that the rotating sleeve 17 can be stably positioned at different rotation positions, providing clear tactile feedback to the operator.

[0035] The multiple sets of positioning blocks 31 and positioning grooves 32 are all set in an arc shape. The arc shape design makes the contact transition between the positioning blocks 31 and positioning grooves 32 smooth, reduces wear and reduces rotational resistance, while providing a more accurate positioning effect and a more comfortable operating feel.

[0036] Each set of slide bars 27 has a baffle 33 fixedly installed on its outer wall. The baffle 33 abuts against the inner wall of the clamping blocks 28. The baffle 33 restricts the movement range of the clamping blocks 28 and prevents the clamping blocks 28 from completely detaching from the slide bars 27 under the action of the tension spring 29, thus ensuring the integrity and reliability of the positioning system and avoiding accidental separation of parts.

[0037] In this embodiment, when the telescope 2 needs to be quickly fixed, the telescope 2 is abutted against the inner wall of multiple sets of elastic plates 4, multiple sets of fixing plates 5 are abutted against the outer wall of the soft pad 26, the insertion rod 7 is inserted into the insertion hole 6, and then the fixing sleeve 8 is inserted into the insertion rod 7. The top block 23 abuts against the inner wall of the fixing sleeve 8 to compress the compression spring 22, and pushes the limiting sleeve 14 to abut against the outer wall of multiple sets of push blocks 12 and compresses the push spring 20. The multiple sets of push blocks 12 push the locking block 10 to engage in the locking groove 11 through the slider 9 to engage the insertion rod 7. At this time, multiple sets of arc rods 16 are aligned with the limiting hole 19. The rotating sleeve 17 drives the multiple sets of limiting rods 18 to rotate, so that the multiple sets of arc rods 16 are respectively inserted into the multiple sets of limiting holes 19 to fix the limiting sleeve 14. The multiple sets of tension springs 29 pull the clamping block 28 to clamp the rotating sleeve 17 on the outer wall of the multiple sets of positioning blocks 31 to position the rotating sleeve 17.

[0038] More specifically, when the telescope 2 needs to be disassembled, rotating the rotating sleeve 17 drives multiple sets of clamping blocks 28 to rotate. Multiple sets of positioning blocks 31 push the clamping blocks 28 to slide along the slide bar 27 and stretch the tension springs 29. When the positioning blocks 31 move into the next positioning groove 32, the tension springs 29 pull the clamping blocks 28 to clamp onto the outer wall of the positioning block 31. Continuously rotating the rotating sleeve 17 causes the positioning blocks 31 to move within the positioning grooves 32. The rotating sleeve 17 also drives multiple sets of limiting rods 18 to rotate. The movement causes multiple sets of arc-shaped rods 16 to disengage from the limiting holes 19, thereby releasing the fixation of the limiting sleeve 14. This pushes the limiting sleeve 14 to release its contact with multiple sets of push blocks 12. Multiple sets of push springs 20 reset and push the push blocks 12 to slide along the movable groove 13. At the same time, multiple sets of sliders 9 pull the locking block 10 to disengage from the locking groove 11, releasing the locking of the insertion rod 7. The compression spring 22 resets and pushes the insertion rod 7 to disengage from the fixing sleeve 8 and the insertion hole 6, thereby releasing the contact of multiple sets of elastic plates 4 with the outer wall of the telescope 2, allowing the telescope 2 to be disassembled.

[0039] In summary, when the overall equipment is in use or operation: when it is necessary to quickly fix the telescope 2, the telescope 2 is pressed against the inner wall of multiple sets of elastic plates 4, multiple sets of fixing plates 5 are pressed against the outer wall of the soft pad 26, the insertion rod 7 is inserted into the insertion hole 6, and then the fixing sleeve 8 is inserted into the insertion rod 7. The top block 23 presses against the inner wall of the fixing sleeve 8 to compress the compression spring 22, and pushes the limiting sleeve 14 to press against the outer wall of multiple sets of push blocks 12 and compress the push spring 20. The multiple sets of push blocks 12 push the locking block 10 to engage in the locking groove 11 through the slider 9 to engage the insertion rod 7. At this time, multiple sets of arc rods 16 are aligned with the limiting hole 19. The rotating sleeve 17 drives the multiple sets of limiting rods 18 to rotate, so that the multiple sets of arc rods 16 are inserted into the multiple sets of limiting holes 19 to fix the limiting sleeve 14. The multiple sets of tension springs 29 pull the clamping block 28 to clamp the rotating sleeve 17 on the outer wall of the multiple sets of positioning blocks 31.

[0040] However, when the telescope 2 needs to be disassembled, rotating the rotating sleeve 17 drives multiple sets of clamping blocks 28 to rotate. Multiple sets of positioning blocks 31 push the clamping blocks 28 to slide along the slide bar 27 and stretch the tension springs 29. When the multiple sets of positioning blocks 31 move into the next set of positioning grooves 32, the multiple sets of tension springs 29 pull the clamping blocks 28 to clamp them against the outer wall of the positioning blocks 31. Continuously rotating the rotating sleeve 17 causes the multiple sets of positioning blocks 31 to move within the multiple sets of positioning grooves 32. The rotating sleeve 17 drives multiple sets of limiting rods 18 to rotate... Multiple sets of arc-shaped rods 16 disengage from the limiting holes 19, thereby releasing the fixation of the limiting sleeve 14. The limiting sleeve 14 is pushed to release the contact of multiple sets of push blocks 12. Multiple sets of push springs 20 reset and push the push blocks 12 to slide along the movable groove 13. At the same time, multiple sets of sliders 9 pull the locking block 10 to disengage from the locking groove 11, releasing the locking of the insertion rod 7. The compression spring 22 resets and pushes the insertion rod 7 to disengage from the fixing sleeve 8 and the insertion hole 6, thereby releasing the contact of multiple sets of elastic plates 4 with the outer wall of the telescope 2, so that the telescope 2 can be disassembled.

[0041] Of all the solutions mentioned above, those involving connections between two components can be selected based on the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other well-known connection methods. These will not be elaborated on here. For all the fixed connections mentioned above, welding is the preferred option.

[0042] In all the solutions mentioned above, those involving the operation of electrical components, unless otherwise specified, are controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and circuit connections are existing, well-known, and mature technologies, and their specific circuit structures will not be described in detail here.

[0043] Of all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are existing known technologies and will not be addressed in this utility model.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An optical instrument fixing mechanism, comprising a support frame (1) and a telescope (2), characterized in that: The support frame (1) is connected to a mounting frame (3). An elastic plate (4) is fixedly mounted on the outer wall of the mounting frame (3). Multiple sets of elastic plates (4) are provided and clamped to the outer wall of the telescope (2). A fixing plate (5) is fixedly mounted on the top of each set of elastic plates (4). Insertion holes (6) are provided on each set of fixing plates (5). Insert rods (7) are inserted into the multiple sets of insertion holes (6). A fixing sleeve (8) is inserted into the top of the insertion rod (7). A slider (9) is slidably mounted on the outer wall of the fixing sleeve (8). Multiple sliders (9) are provided and a locking block (10) is fixedly mounted on the top of each slider. A locking groove (11) is provided on the outer wall of the insertion rod (7). Multiple sliders (9) A push block (12) is fixedly provided at the top. The outer wall of the fixed sleeve (8) is provided with a movable groove (13). The movable groove (13) is provided in multiple sets and is slidably connected to multiple sets of push blocks (12). The outer wall of the fixed sleeve (8) is provided with a limiting sleeve (14). The outer wall of the limiting sleeve (14) is fixedly provided with an installation block (15). The installation block (15) is provided in multiple sets and the outer wall is fixedly provided with an arc rod (16). The outer wall of the fixed sleeve (8) is rotatably provided with a rotating sleeve (17). The top surface of the rotating sleeve (17) is fixedly provided with a limiting rod (18). The limiting rod (18) is provided in multiple sets and the outer wall is provided with a limiting hole (19).

2. The optical instrument fixing mechanism according to claim 1, characterized in that: multiple sets Push springs (20) are connected between the inner wall of the push block (12) and the movable groove (13), and multiple sets of push springs (20) are provided.

3. The optical instrument fixing mechanism according to claim 2, characterized in that: The insert (7) has a sliding hole (21) inside, a compression spring (22) is connected inside the sliding hole (21), and a top block (23) is connected to the top of the compression spring (22). The top block (23) slides inside the sliding hole (21).

4. The optical instrument fixing mechanism according to claim 3, characterized in that: The inner wall of the limiting sleeve (14) is fixedly provided with a guide plate (24), and the outer wall of the fixing sleeve (8) is provided with a guide groove (25). The guide plate (24) and the guide groove (25) are provided in multiple sets and are slidably connected.

5. The optical instrument fixing mechanism according to claim 4, characterized in that: A soft pad (26) is provided between each of the multiple sets of fixing plates (5).

6. The optical instrument fixing mechanism according to claim 5, characterized in that: The bottom surface of the rotating sleeve (17) is provided with a slide bar (27). Multiple sets of slide bars (27) are distributed on the bottom surface of the rotating sleeve (17). Clamping blocks (28) are slidably provided on each set of slide bars (27). Multiple sets of clamping blocks (28) are provided, and tension springs (29) are respectively connected to their inner walls. A fixing ring (30) is fixedly provided on the outer wall of the fixed sleeve (8). A positioning block (31) is provided on the top surface of the fixing ring (30). Multiple sets of positioning blocks (31) are provided. A positioning groove (32) is opened on the top surface of each set of clamping blocks (28).

7. The optical instrument fixing mechanism according to claim 6, characterized in that: The multiple sets of positioning blocks (31) and positioning grooves (32) are all set to be arc-shaped.

8. The optical instrument fixing mechanism according to claim 7, characterized in that: multiple sets Each of the slide bars (27) has a baffle (33) fixedly installed on its outer wall, and multiple sets of the baffles (33) abut against the inner wall of multiple sets of clamping blocks (28).

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