Hoisting mechanism for electrical equipment installation

Abstract

The utility model discloses a hoisting mechanism for electrical equipment installation, which comprises an underframe, a double-cylinder driving mechanism, a hook adjusting mechanism and an adjusting auxiliary mechanism, the double-cylinder driving mechanism comprises a main body frame, a double-drive hydraulic cylinder, a lifting arm and a connecting chain; the hook adjusting mechanism comprises a clamping pipe, a clamping rod, an annular groove, a mounting groove, a rotating toothed plate, a limiting toothed ring and an embedded plate, large lifting force can be effectively provided through the design of a double-drive hydraulic cylinder and a lifting arm, so that the equipment can stably lift a heavy object and is suitable for a large-load lifting task, a connecting chain and the lifting arm are used in cooperation, and the lifting efficiency is improved. The stability of a load in the hoisting process can be guaranteed, the hook adjusting mechanism enables the hook to be accurately positioned according to actual needs during hoisting operation, the meshing design of the rotating toothed plate and the limiting toothed ring ensures the stability and safety of the hook during adjustment, and the hook is prevented from loosening in the hoisting process; the fixing position of the hook can be easily adjusted.

Description

Technical Field

[0001] This utility model relates to the field of hoisting technology, and more specifically, to a hoisting mechanism for installing power equipment. Background Technology

[0002] In existing technologies, the lifting process of a hoisting mechanism for power equipment installation is unstable, and the adjustment of the hook assembly is inconvenient, resulting in reduced efficiency and safety of the hoisting operation. In traditional hoisting mechanisms, the lifting process of the boom often relies on a hydraulic system. However, due to factors such as pressure fluctuations in the hydraulic system, the durability of the cylinder, and friction within the system, the lifting of the boom often becomes unstable. Due to changes in hydraulic oil flow or wear of cylinder components, the cylinder may not be able to continuously and stably extend and retract during operation, causing the boom to vibrate or tilt during the lifting process. This vibration not only affects the stability of the hoisted item but also increases the wear and tear on the hoisting equipment itself.

[0003] Many existing hook adjustment systems can only be adjusted within a limited range, while lifting tasks may require more precise adjustment capabilities. For example, hooks need to be precisely positioned according to the shape and size of the object being lifted. If the adjustment range of the adjustment mechanism is limited, the hook may not be able to fully match the lifting point of the object during lifting. In existing adjustment mechanisms, although hook adjustment is possible, sometimes due to the imprecise design of the locking mechanism or excessive wear, the hook may not be able to be securely locked in the required position, resulting in the hook becoming loose or slipping, which increases the risk during the lifting process. 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 a hoisting mechanism for power equipment installation, so as to solve the technical problems mentioned in the background art, such as the instability of the lifting process of the lifting arm and the inconvenience of adjusting the hook assembly.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a hoisting mechanism for installing power equipment, comprising a base frame, a double-cylinder drive mechanism, a hook adjustment mechanism, and an adjustment auxiliary mechanism. The double-cylinder drive mechanism includes a main frame, a double-drive hydraulic cylinder, a lifting arm, and a connecting chain. The main frame is mounted on the side of the base frame, the double-drive hydraulic cylinder is rotatably mounted on the bottom end of the main frame, and the other end of the double-drive hydraulic cylinder is rotatably connected to the lifting arm. The lifting arm is rotatably connected to the main frame, and the connecting chain is mounted on one end of the lifting arm. The hook adjustment mechanism includes a clamping tube, a clamping rod, an annular groove, an installation groove, a rotating toothed plate, a limiting toothed ring, and an embedded plate. The annular groove is provided on the side wall of the clamping rod, the installation groove is provided on the outer wall of the clamping tube, the rotating toothed plate is rotatably mounted in the installation groove, the limiting toothed ring is rotatably mounted on the outer wall of the clamping tube, the limiting toothed ring is meshed with the rotating toothed plate, and the embedded plate is mounted on the rotating toothed plate. The rotation of the rotating toothed plate causes the embedded plate to extend into the annular groove, fixing the clamping rod in the clamping tube. When rotating in the opposite direction, the rotating toothed plate moves away from the annular groove.

[0008] The present invention is further configured such that the adjustment auxiliary mechanism includes a rotating block, a rotating ring, a step groove, a fixed frame, and a compression spring frame. The rotating block is installed at the bottom end of the limiting toothed ring, the rotating ring is installed on the rotating block, and the rotating ring is limited to rotating on the outer wall of the clamping tube. The step groove is set on the rotating ring, the fixed frame is fixedly installed on the outer wall of the clamping tube, and the compression spring frame is installed on the fixed frame. The compression spring frame can extend into the step groove step by step, so that the rotating block and the limiting toothed ring can be stably locked and rotated step by step.

[0009] This invention is further configured such that a stabilizing sleeve is installed at one end of the connecting chain, and an extension plate is slidably installed inside the stabilizing sleeve. The design of the stabilizing sleeve ensures a more stable and safer connection between the chain and the lifting mechanism. The extension plate slidably installed inside the stabilizing sleeve effectively prevents the chain or connecting components from loosening, increasing the stability of the system.

[0010] The present invention is further configured such that a hook assembly is installed at one end of the extension plate and the stabilizing sleeve, and an adjustment hole is provided on the extension plate, and multiple sets of adjustment holes are provided. The design of the adjustment hole allows the user to flexibly adjust the position of the hook assembly at one end of the extension plate and the stabilizing sleeve as needed to adapt to different hoisting requirements.

[0011] The present invention is further provided that a connecting plate is installed at the bottom end of the side wall of the clamping tube, and the clamping tube is fixedly installed on the outer wall of the stabilizing sleeve by means of the connecting plate. The setting of the connecting plate facilitates the stable installation of the clamping tube.

[0012] The present invention is further configured such that the snap-fit ​​rod can pass through the stabilizing sleeve and different adjustment holes and engage with the snap-fit ​​tube, thereby adjusting the relative position of the hook assembly at one end of the extension plate and the stabilizing sleeve. The snap-fit ​​tube and the snap-fit ​​rod can achieve precise adjustment and fixation of the lifting hook.

[0013] The present invention is further configured such that a rotating shaft is installed on the rotating tooth plate, and the rotating tooth plate is rotatably installed in the mounting groove by the rotating shaft. The rotating shaft installed on the rotating tooth plate enables the rotating tooth plate to rotate smoothly, avoiding jamming or excessive wear, and ensuring that the adjustment mechanism can rotate accurately when needed.

[0014] The present invention is further configured such that a bottom wheel is installed at the bottom end of the base frame, and a direction adjustment handle is installed on the side of the base frame. The direction adjustment handle allows the operator to easily adjust the movement direction of the equipment, increasing the flexibility of operation. Especially in confined spaces or environments requiring precise positioning, it can improve work efficiency.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a hoisting mechanism for installing power equipment, which has the following advantages:

[0017] This utility model features a dual-cylinder drive mechanism. The design of dual-drive hydraulic cylinders and lifting arm can effectively provide a large lifting force, enabling the equipment to stably lift heavy objects. It is suitable for lifting tasks with large loads. The coordinated use of the connecting chain and lifting arm can ensure the stability of the load during the lifting process and reduce deviation or imbalance. The dual-cylinder drive structure design allows the equipment to achieve precise up and down adjustment, making it easy for operators to flexibly control the height of the lifting equipment.

[0018] This utility model is equipped with a hook adjustment mechanism. Through the cooperation of components such as the locking tube, locking rod, rotating toothed plate, and limiting toothed ring, the fixed position of the hook can be finely adjusted, so that the hook can be accurately positioned according to actual needs during hoisting operations. The meshing design of the rotating toothed plate and the limiting toothed ring ensures the stability and safety of the hook adjustment, preventing the hook from loosening during hoisting. The fixed position of the hook can be easily adjusted by rotation, improving the adaptability and work efficiency of the hoisting equipment.

[0019] This utility model is equipped with an adjustment auxiliary mechanism and a step-by-step locking design between the rotating block and the rotating ring. The rotating block is gradually fixed by the step groove of the pressure spring frame, which can ensure that the adjustment mechanism will not move unexpectedly during the adjustment process, thereby improving the stability and safety of the system. Through the cooperation of the pressure spring frame and the step groove, precise step-by-step locking can be achieved, making the adjustment process of the equipment more stable and controllable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the device in the unused state of this utility model;

[0021] Figure 2 This is a schematic diagram of the hook adjustment mechanism in this utility model. Figure 1 ;

[0022] Figure 3 This is a schematic diagram of the hook adjustment mechanism in this utility model. Figure 2 ;

[0023] Figure 4 This is a schematic diagram of the hook adjustment mechanism and the adjustment auxiliary mechanism in this utility model;

[0024] Figure 5 This is a schematic diagram of the internal structure of the hook adjustment mechanism and the adjustment auxiliary mechanism in this utility model.

[0025] In the diagram: 1. Main frame; 2. Dual-drive hydraulic cylinder; 3. Lifting arm; 4. Connecting chain; 5. Snap-fit ​​pipe; 6. Snap-fit ​​rod; 7. Annular groove; 8. Mounting groove; 9. Rotating toothed plate; 10. Limiting toothed ring; 11. Embedded plate; 12. Rotating block; 13. Rotating ring; 14. Step groove; 15. Fixing frame; 16. Compression spring frame; 17. Stabilizing sleeve; 18. Extension plate; 19. Hook assembly; 20. Adjustment hole; 21. Connecting plate; 22. Rotating shaft; 23. Bottom wheel; 24. Direction adjustment handle; 101. Base frame. 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 1-5A hoisting mechanism for installing power equipment includes a base frame 101, a dual-cylinder drive mechanism, a hook adjustment mechanism, and an adjustment auxiliary mechanism. The dual-cylinder drive mechanism includes a main frame 1, dual-drive hydraulic cylinders 2, a lifting arm 3, and a connecting chain 4. The main frame 1 is mounted on the side of the base frame 101. The dual-drive hydraulic cylinders 2 are rotatably mounted on the bottom end of the main frame 1, and the other end of the dual-drive hydraulic cylinders 2 is rotatably connected to the lifting arm 3. The lifting arm 3 is rotatably connected to the main frame 1. The connecting chain 4 is mounted on one end of the lifting arm 3. The hook adjustment mechanism includes a locking tube 5, a locking rod 6, and an annular groove. 7. Mounting groove 8, rotating toothed plate 9, limiting toothed ring 10, and embedding plate 11. The annular groove 7 is set on the side wall of the snap-fit ​​rod 6, and the mounting groove 8 is set on the outer wall of the snap-fit ​​tube 5. The rotating toothed plate 9 is rotatably mounted in the mounting groove 8, and the limiting toothed ring 10 is rotatably mounted on the outer wall of the snap-fit ​​tube 5. The limiting toothed ring 10 is meshed with the rotating toothed plate 9, and the embedding plate 11 is mounted on the rotating toothed plate 9. The rotation of the rotating toothed plate 9 drives the embedding plate 11 to extend into the annular groove 7, fixing the snap-fit ​​rod 6 in the snap-fit ​​tube 5. When rotating in the opposite direction, the rotating toothed plate 9 moves away from the annular groove 7.

[0030] In this embodiment, the dual-drive hydraulic cylinder 2 is installed at the bottom end of the main frame 1, and the other end is rotatably connected to the lifting arm 3. When the dual-drive hydraulic cylinder 2 is activated, the hydraulic pressure inside the cylinder drives the two hydraulic cylinder rods to extend and retract, thereby pushing the lifting arm 3 to rotate. When the piston of the hydraulic cylinder extends, the lifting arm 3 drives the hook assembly 19 to rise, realizing the initial lifting of the hoisting operation. By adjusting the extension and retraction of the hydraulic cylinder, the lifting arm 3 can rise at different angles to precisely adjust the position of the hoisting load. The locking rod 6 and the locking pipe 5 are connected through the annular groove 7 and the mounting groove 8. Plate 9 is installed in the mounting groove 8 and engages with the limiting toothed ring 10. When the position of the hook needs to be adjusted, the operator rotates the rotating toothed plate 9. The rotation of the rotating toothed plate 9 causes the embedded plate 11 to extend into the annular groove 7, further securing the locking rod 6 into the locking tube 5. The rotation of the rotating toothed plate 9 allows the hook system to fix the hook in a specific position and adjust and release it as needed. When the rotating toothed plate 9 is rotated in the opposite direction, the hook mechanism is released, the locking rod 6 and the locking tube 5 separate, and the hook system returns to the loosened state, ready for readjustment or disassembly.

[0031] The adjustment auxiliary mechanism includes a rotating block 12, a rotating ring 13, a step groove 14, a fixed frame 15, and a compression spring frame 16. The rotating block 12 is installed at the bottom end of the limiting toothed ring 10, the rotating ring 13 is installed on the rotating block 12, and the rotating ring 13 is limited to rotating on the outer wall of the locking tube 5. The step groove 14 is set on the rotating ring 13, the fixed frame 15 is fixedly installed on the outer wall of the locking tube 5, and the compression spring frame 16 is installed on the fixed frame 15. The compression spring frame 16 can extend into the step groove 14 step by step, so that the rotating block 12 and the limiting toothed ring 10 are stably locked and rotated step by step.

[0032] In this embodiment, the rotating block 12 is installed at the bottom of the limiting toothed ring 10, and the rotating ring 13 cooperates with the step groove 14. The step adjustment is achieved through the action of the compression spring frame 16. The rotating block 12 starts to rotate by interacting with the limiting toothed ring 10. The rotating ring 13 is installed on the rotating block 12 and cooperates with the external step groove 14. The compression spring frame 16 extends into the step groove 14 step by step to help the rotating block 12 move stably between different positions and lock each adjustment state step by step. The adjustment auxiliary mechanism ensures the smoothness and accuracy of the hook adjustment.

[0033] Please see Figures 1-5 As a supplementary embodiment of a hoisting mechanism for power equipment installation, which includes a dual-cylinder drive mechanism, a hook adjustment mechanism, and an adjustment auxiliary mechanism: A stabilizing sleeve 17 is installed at one end of the connecting chain 4, and an extension plate 18 is slidably installed inside the stabilizing sleeve 17. A hook assembly 19 is installed at one end of the extension plate 18 and the stabilizing sleeve 17, and an adjustment hole 20 is provided on the extension plate 18. Multiple sets of adjustment holes 20 are provided on the adjustment holes 20. A connecting plate 21 is installed at the bottom end of the side wall of the clamping pipe 5, and is fixedly installed on the outer wall of the stabilizing sleeve 17 through the connecting plate 21. The clamping rod 6 can pass through the stabilizing sleeve 17 and different adjustment holes 20 to engage with the clamping pipe 5, thereby adjusting the relative position of the hook assembly 19 at one end of the extension plate 18 and the stabilizing sleeve 17. A rotating shaft 22 is installed on the rotating tooth plate 9, and the rotating tooth plate 9 is rotated and installed in the mounting groove 8 through the rotating shaft 22. A bottom wheel 23 is installed at the bottom end of the base frame 101, and a direction adjustment handle 24 is installed on the side of the base frame 101.

[0034] More specifically, the hydraulic system is activated, and the dual-drive hydraulic cylinder 2 is engaged. Through its extension and retraction, the lifting arm 3 is lifted upwards. The operation of the dual-drive hydraulic cylinder 2 allows for precise lifting and lowering adjustments of the loaded object during the hoisting process. During hoisting, the operator can use the hook adjustment mechanism to rotate the toothed plate 9 to drive the embedded plate 11 into the annular groove 7, thereby fixing or releasing the connection between the locking rod 6 and the locking pipe 5. This adjustment function allows the hoisting hook to be precisely positioned at the required height and angle, ensuring that the object will not slip during hoisting. When further precise control of the stability and position of the hook is required, the adjustment auxiliary mechanism, through the cooperation of the rotating block 12 and the rotating ring 13, helps to lock the hoisting mechanism at multiple different adjustment levels. The compression spring frame 16 locks the adjustment position step by step. Throughout the operation, the bottom wheels 23 and the direction adjustment handle 24 installed on the base frame 101 ensure the flexibility and ease of operation of the device. The bottom wheels 23 allow the entire device to move smoothly on the ground, while the direction adjustment handle 24 helps the operator to make reverse fine adjustments, making the hoisting process more precise.

[0035] In summary, when the overall equipment is in use or operation: when the dual-cylinder drive mechanism is required, the dual-drive hydraulic cylinder 2 is installed at the bottom end of the main frame 1, and the other end is rotatably connected to the lifting arm 3. When the dual-drive hydraulic cylinder 2 is started, the hydraulic pressure inside the cylinder drives the two hydraulic cylinder rods to extend and retract, thereby pushing the lifting arm 3 to rotate. When the piston of the hydraulic cylinder extends, the lifting arm 3 drives the hook assembly 19 to rise, realizing the initial lifting of the hoisting operation. By adjusting the extension and retraction of the hydraulic cylinder, the lifting arm 3 can rise at different angles and accurately adjust the position of the hoisting load.

[0036] When the hook adjustment mechanism is in operation, the locking rod 6 and the locking tube 5 are connected through the annular groove 7 and the mounting groove 8. The rotating toothed plate 9 is installed in the mounting groove 8 and engages with the limiting toothed ring 10. When the position of the hook needs to be adjusted, the operator rotates the rotating toothed plate 9. The rotation of the rotating toothed plate 9 causes the embedded plate 11 to extend into the annular groove 7, further securing the locking rod 6 firmly in the locking tube 5. The rotation of the rotating toothed plate 9 allows the hook system to fix the hook in a specific position and adjust and release it as needed. When the rotating toothed plate 9 is rotated in the opposite direction, the hook mechanism is released, the locking rod 6 and the locking tube 5 separate, and the hook system returns to the loosened state, ready for readjustment or disassembly.

[0037] When the auxiliary mechanism needs to be adjusted, the rotating block 12 is installed at the bottom of the limiting toothed ring 10, and the rotating ring 13 cooperates with the step groove 14. The step adjustment is achieved through the action of the compression spring frame 16. The rotating block 12 starts to rotate by interacting with the limiting toothed ring 10. The rotating ring 13 is installed on the rotating block 12 and cooperates with the external step groove 14. The compression spring frame 16 extends into the step groove 14 step by step to help the rotating block 12 move stably between different positions and lock each adjustment state step by step. The adjustment auxiliary mechanism ensures the smoothness and accuracy of the hook adjustment.

[0038] The hydraulic system is activated, and the dual-drive hydraulic cylinder 2 is engaged. Its extension and retraction drive the lifting arm 3 to rise. The operation of the dual-drive hydraulic cylinder 2 allows for precise lifting and lowering adjustments of the loaded object during hoisting. During hoisting, the operator can use the hook adjustment mechanism to rotate the toothed plate 9, causing the embedded plate 11 to extend into the annular groove 7, thereby fixing or releasing the connection between the locking rod 6 and the locking pipe 5. This adjustment function allows the hoisting hook to be precisely positioned at the required height and angle, ensuring that the object will not slip during hoisting. When further precise control of the hook's stability and position is required, the adjustment auxiliary mechanism, through the cooperation of the rotating block 12 and the rotating ring 13, helps to lock the hoisting mechanism at multiple different adjustment levels. The compression spring frame 16 locks the adjustment position level by level. Throughout the operation, the bottom wheels 23 and the direction adjustment handle 24 installed on the base frame 101 ensure the flexibility and ease of operation of the device. The bottom wheels 23 allow the entire device to move smoothly on the ground, while the direction adjustment handle 24 helps the operator to make reverse fine adjustments, making the hoisting process more precise.

[0039] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A hoisting mechanism for installing power equipment, comprising a base frame (101), a double-cylinder drive mechanism, a hook adjustment mechanism, and an adjustment auxiliary mechanism, characterized in that: The dual-cylinder drive mechanism includes a main frame (1), dual-drive hydraulic cylinders (2), a lifting arm (3), and a connecting chain (4). The main frame (1) is mounted on the side of the base frame (101). The dual-drive hydraulic cylinders (2) are rotatably mounted on the bottom end of the main frame (1). The other end of the dual-drive hydraulic cylinders (2) is rotatably connected to the lifting arm (3). The lifting arm (3) is rotatably connected to the main frame (1). The connecting chain (4) is mounted on one end of the lifting arm (3). The hook adjustment mechanism includes a locking tube (5), a locking rod (6), an annular groove (7), a mounting groove (8), and a rotating toothed plate (9). The limiting toothed ring (10) and the embedding plate (11) are provided. The annular groove (7) is provided on the side wall of the snap-fit ​​rod (6). The mounting groove (8) is provided on the outer wall of the snap-fit ​​tube (5). The rotating toothed plate (9) is limited and rotated and installed in the mounting groove (8). The limiting toothed ring (10) is rotated and installed on the outer wall of the snap-fit ​​tube (5). The limiting toothed ring (10) is engaged with the rotating toothed plate (9). The embedding plate (11) is installed on the rotating toothed plate (9). The rotation of the rotating toothed plate (9) drives the embedding plate (11) to extend into the annular groove (7) and fix the snap-fit ​​rod (6) in the snap-fit ​​tube (5).

2. The hoisting mechanism for installing power equipment according to claim 1, characterized in that: The adjustment auxiliary mechanism includes a rotating block (12), a rotating ring (13), a step groove (14), a fixed frame (15), and a compression spring frame (16). The rotating block (12) is installed at the bottom end of the limiting toothed ring (10), the rotating ring (13) is installed on the rotating block (12), and the rotating ring (13) is limited to rotating on the outer wall of the locking tube (5). The step groove (14) is set on the rotating ring (13), the fixed frame (15) is fixedly installed on the outer wall of the locking tube (5), and the compression spring frame (16) is installed on the fixed frame (15). The compression spring frame (16) can extend into the step groove (14) step by step, so that the rotating block (12) and the limiting toothed ring (10) are stably locked and rotated step by step.

3. The hoisting mechanism for installing power equipment according to claim 1, characterized in that: One end of the connecting chain (4) is provided with a stabilizing sleeve (17), and an extension plate (18) is slidably installed inside the stabilizing sleeve (17).

4. The hoisting mechanism for installing power equipment according to claim 3, characterized in that: A hook assembly (19) is installed at one end of the extension plate (18) and the stabilizing sleeve (17), and an adjustment hole (20) is provided on the extension plate (18), and multiple sets of adjustment holes (20) are provided on the adjustment hole (20).

5. A hoisting mechanism for installing power equipment according to claim 3, characterized in that: A connecting plate (21) is installed at the bottom of the side wall of the card tube (5), and is fixedly installed on the outer wall of the stabilizing sleeve (17) by the connecting plate (21).

6. The hoisting mechanism for installing power equipment according to claim 4, characterized in that: The snap-fit ​​rod (6) can pass through the stabilizing sleeve (17) and different adjustment holes (20) to engage with the snap-fit ​​tube (5) and adjust the relative position of the hook assembly (19) at one end of the extension plate (18) and the stabilizing sleeve (17).

7. The hoisting mechanism for installing power equipment according to claim 1, characterized in that: A rotating shaft (22) is installed on the rotating tooth plate (9), and the rotating tooth plate (9) is rotated and installed in the mounting groove (8) by the rotating shaft (22).

8. The hoisting mechanism for installing power equipment according to claim 1, characterized in that: The bottom end of the base frame (101) is equipped with a bottom wheel (23), and the side of the base frame (101) is equipped with a direction adjustment handle (24).

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