An elevator counterweight shell bending apparatus

Abstract

The application discloses an elevator counterweight shell bending equipment and relates to the technical field of bending equipment.The application comprises a machine tool, one end of the machine tool is fixedly connected with a top table, one end of the top table is movably provided with a pair of bending slide rods, the bottom of each of the two bending slide rods is fixedly connected with a bending module, one end of the top table is fixedly connected with a hydraulic rod, and the output end of the hydraulic rod is fixedly connected with the bending module.When the hydraulic rod is started to drive the bending module to remove the interference with the workpiece, the stripping assembly drives the transmission rod to rotate around the hinge shaft, drives the transmission lug to slide along the inside of the follow-up sliding groove, and drives the stripping inclined table to slide along the guide inclined surface of the bending module through the transmission lug, so that one end of the stripping inclined table is separated from the adhesion with the bottom of the bending module, the surface of the workpiece is quickly separated from the adhesion with the bending module, the labor intensity of workers is effectively reduced, and the processing efficiency of the device is improved.

Description

Technical Field

[0001] This application relates to the field of bending equipment technology, and in particular to a bending equipment for elevator counterweight housing. Background Technology

[0002] Elevator counterweights are a crucial component of elevator systems, primarily used to balance the weight of the elevator car and ensure smooth and safe elevator operation. Counterweights are typically made of metal, and their outer shells need to be processed into specific shapes using bending equipment to meet strength and dimensional requirements. Traditional bending processes are prone to problems during processing due to the interaction between the material and the equipment. For example, the bent material may stick to the bending block, leading to difficulties in material preparation and impacting production efficiency and product quality. Therefore, developing an efficient and reliable elevator counterweight shell bending device is of great significance.

[0003] Currently, the bending of elevator counterweight shells mainly employs mechanical or hydraulic bending equipment. Mechanical bending equipment achieves bending through mechanical transmission, offering advantages such as simple structure and low cost. However, it is prone to springback when processing high-hardness materials, affecting bending accuracy. Hydraulic bending equipment, on the other hand, uses a hydraulic system to drive the bending block, providing greater pressure and a more stable bending effect, making it suitable for processing various materials.

[0004] However, during the bending process, existing equipment is prone to causing the bent material to stick to the bending block due to the friction between the material and the bending block and the characteristics of the material surface. This requires manual assistance in unloading the material, which increases the labor intensity of the operators and reduces the production efficiency of the equipment. Utility Model Content

[0005] The purpose of this application is to solve the problem that in the existing equipment, the bent material is easily stuck to the bending block during the bending process, which reduces the production efficiency of the device. This application provides an elevator counterweight block shell bending device.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution:

[0007] An elevator counterweight shell bending device includes a machine tool. A top platform is fixedly connected to one end of the machine tool. A pair of bending slide rods are movably threaded through one end of the top platform. A bending module is fixedly connected to the bottom of the two bending slide rods. A hydraulic rod is fixedly connected to one end of the top platform. The output end of the hydraulic rod is fixedly connected to the bending module. A transmission rod is symmetrically hinged to one end of the bending module, and a stripping ramp is symmetrically slidably connected to one end of the bending module. A transmission protrusion is symmetrically fixedly connected to one end of the stripping ramp. A follower groove adapted to the transmission protrusion is opened at one end of the transmission rod. A bending groove is opened at the top of the machine tool. A bending base plate is slidably connected inside the bending groove. The bending base plate is installed below the bending module. A stripping component is installed at one end of the bending module. A lifting mechanism is installed at one end of the machine tool.

[0008] By adopting the above technical solution, and by setting up the stripping assembly in conjunction with the transmission rod, stripping ramp, transmission cam, and follower slide, it is convenient to use the stripping assembly to drive the transmission rod to rotate around the hinge axis when the hydraulic rod is activated to drive the bending module to release the resistance to the workpiece. This drives the transmission cam to slide along the inside of the follower slide, and at the same time pushes the transmission cam to drive the stripping ramp to slide along the guide ramp of the bending module. This allows the stripping ramp to push one end of the workpiece to detach from the bottom of the bending module, so that the surface of the workpiece can quickly detach from the bending module. This effectively reduces the labor intensity of the workers and improves the processing efficiency of the device.

[0009] Furthermore, the stripping assembly includes stripping grooves symmetrically opened at one end of the bending module. A double-sided rack is slidably connected inside the stripping groove. A transmission gear that meshes with the double-sided rack is fixedly connected to the hinge shaft end of the transmission rod and the bending module. A tension spring is fixedly connected to one end of the bending module, and the bottom of the tension spring is fixedly connected to the double-sided rack.

[0010] By adopting the above technical solution, and by setting up the cooperation between the tension spring and the transmission gear 1 and the double-sided rack, the spring's rebound characteristics are utilized. When the hydraulic rod is activated to drive the bending module to disengage from the workpiece, the tension spring pulls the double-sided rack to mesh with the transmission gear 1, causing the transmission gear 1 to drive the transmission rod to rotate around the hinge axis. At the same time, the transmission rod pushes the transmission cam to drive the unloading ramp to slide along the guide ramp of the bending module, pushing the workpiece to disengage from the bending module. This facilitates the rapid disengagement of the workpiece from the bending module and effectively improves the practicality of the device.

[0011] Furthermore, the lifting mechanism includes symmetrically formed arc-shaped cylindrical grooves inside the bending groove, with a bending roller rotatably connected inside the arc-shaped cylindrical groove. One end of the bending roller has a right-angle groove, and a transmission component is installed at one end of the bending roller. A lifting component is installed at one end of the machine tool.

[0012] By adopting the above technical solution, and by setting the bending base plate and the right-angle groove to work together, it is convenient for the bending module to push the workpiece and drive the bending base plate to embed into the bending groove. This allows the bending base plate to work with the right-angle groove to drive the bending roller to rotate, thereby causing one end of the bending roller to form a secondary bending of the workpiece, thus improving the bending effect of the device.

[0013] Furthermore, the transmission assembly includes a pair of transmission racks symmetrically mounted at one end of the machine tool, with a synchronizing rod fixedly connected to the bottom of the two adjacent transmission racks, and a transmission gear two meshing with the transmission racks symmetrically fixedly connected to one end of the bending roller.

[0014] By adopting the above technical solution, and by setting the transmission rack and transmission gear two to work together, when the driving bending module releases its resistance to the bending base plate, the lifting component and the synchronizing rod work together to push the transmission rack and transmission gear two to mesh, and drive the bending roller to rotate. This causes the bending roller to push the bending base plate to move upward along the length of the bending groove, thereby facilitating the automatic reset of the bending base plate and effectively improving the practicality of the device.

[0015] Furthermore, the lifting assembly includes lifting slide rods symmetrically and fixedly connected to one end of the synchronizing rod. One end of the lifting slide rod is slidably connected to the machine tool, and a lifting spring is sleeved on one end of the lifting slide rod. The lifting spring is installed between the synchronizing rod and the machine tool.

[0016] By adopting the above technical solution, and by setting up the cooperation between the lifting slide rod and the lifting spring, it is convenient to use the elastic characteristics of the lifting spring to push the synchronizing rod to drive the transmission rack to slide along the length direction of the lifting slide rod, which effectively improves the practicality of the device.

[0017] Furthermore, each of the four top corners of the machine tool is equipped with an abutment slider, one end of which is slidably inserted with an abutment rod. The bottom of the abutment rod is fixedly connected to a limit plate, and one end of the abutment rod is fitted with a limit spring. The limit spring is installed between the limit plate and the abutment slider.

[0018] By adopting the above technical solution, and by setting the limit spring in conjunction with the limit plate and the contact slide rod, the elastic characteristics of the limit spring can be utilized to make the limit spring rebound and push the limit plate to form contact with the workpiece, so as to achieve pre-fixation of the workpiece and improve the accuracy of the device.

[0019] Furthermore, each of the four corners of the top of the machine tool is rotatably connected to an adjusting rod, and one end of the adjusting rod is provided with an adjusting groove, and the abutting slider is slidably connected inside the adjusting groove.

[0020] By adopting the above technical solution, and by setting the adjustment rod and the adjustment slide groove to work together, it is easy to push the resisting slider to drive the limiting plate to move along the length direction of the adjustment slide groove, thereby improving the applicability of the device.

[0021] In summary, this application includes at least one of the following beneficial effects:

[0022] 1. By setting up the stripping assembly in conjunction with the transmission rod, stripping ramp, transmission cam, and follower slide, it is convenient to use the stripping assembly to drive the transmission rod to rotate around the hinge axis when the hydraulic rod drives the bending module to release the resistance to the workpiece. This drives the transmission cam to slide along the inside of the follower slide, and at the same time pushes the transmission cam to drive the stripping ramp to slide along the guide ramp of the bending module. This allows the stripping ramp to push one end of the workpiece to detach from the bottom of the bending module, so that the surface of the workpiece can quickly detach from the bending module. This effectively reduces the labor intensity of the workers and improves the processing efficiency of the device.

[0023] 2. By using a tension spring in conjunction with a transmission gear and a double-sided rack, the spring's rebound characteristic is utilized. When the hydraulic rod is activated to drive the bending module to disengage from the workpiece, the tension spring pulls the double-sided rack to mesh with the transmission gear, causing the transmission gear to drive the transmission rod to rotate around the hinge axis. Simultaneously, the transmission rod pushes the transmission cam to move the unloading ramp along the guide ramp of the bending module, pushing the workpiece away from the bending module. This facilitates rapid separation of the workpiece from the bending module, effectively improving the device's practicality. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the main body of the device in this application.

[0025] Figure 2 This is a three-dimensional structural diagram of the unloading component in this application.

[0026] Figure 3 This is an exploded view of the internal structure of the bending groove in this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Machine tool; 2. Top platform; 3. Bending slide bar; 4. Bending module; 5. Hydraulic rod; 6. Transmission rod; 7. Unloading ramp; 8. Transmission convex rod; 9. Follower slide; 10. Bending groove; 11. Bending base plate; 12. Unloading slide; 13. Double-sided rack; 14. Transmission gear one; 15. Tension spring; 16. Arc-shaped cylindrical groove; 17. Bending roller; 18. Right-angle groove; 19. Transmission gear two; 20. Transmission rack; 21. Synchronizing rod; 22. Lifting slide bar; 23. Lifting spring; 24. Abutting slider; 25. Abutting slide bar; 26. Limiting plate; 27. Limiting spring; 28. Adjusting rod; 29. ​​Adjusting slide. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 —3 provides further detailed description of this application.

[0030] This application discloses an elevator counterweight shell bending device.

[0031] Reference Figure 1 - Figure 3 An elevator counterweight shell bending device includes a machine tool 1. A top platform 2 is fixedly connected to one end of the machine tool 1. A pair of bending slide rods 3 are movably passed through one end of the top platform 2. A bending module 4 is fixedly connected to the bottom of the two bending slide rods 3. A hydraulic rod 5 is fixedly connected to one end of the top platform 2. The output end of the hydraulic rod 5 is fixedly connected to the bending module 4. A transmission rod 6 is symmetrically hinged to one end of the bending module 4. A material removal ramp 7 is symmetrically slidably connected to one end of the bending module 4. A transmission protrusion 8 is symmetrically fixedly connected to one end of the material removal ramp 7. A follower groove 9 adapted to the transmission protrusion 8 is opened at one end of the transmission rod 6. A bending groove 10 is opened at the top of the machine tool 1. A bending base plate 11 is slidably connected inside the bending groove 10. The bending base plate 11 is installed below the bending module 4. A material removal component is installed at one end of the bending module 4. A lifting mechanism is installed at one end of the machine tool 1.

[0032] The material removal assembly includes a material removal chute 12 symmetrically opened at one end of the bending module 4. A double-sided rack 13 is slidably connected inside the material removal chute 12. A transmission gear 14 that meshes with the double-sided rack 13 is fixedly connected to the hinge shaft end of the transmission rod 6 and the bending module 4. A tension spring 15 is fixedly connected to one end of the bending module 4. The bottom of the tension spring 15 is fixedly connected to the double-sided rack 13.

[0033] In use, the workpiece is first placed on top of the bending base plate 11. Then, the hydraulic rod 5 is activated to drive the bending module 4 to move downward along the length of the bending slide bar 3, and to drive the unloading ramp 7 to fit against the top of the workpiece. The unloading ramp 7 drives the transmission protrusion 8 to slide along the guide ramp of the bending module 4. At the same time, the transmission protrusion 8 fits against the inner wall of the follower slide 9, and drives the transmission rod 6 to rotate around the hinge shaft. The transmission rod 6 drives the transmission gear 14 to mesh with the double-sided rack 13, and the double-sided rack 13 slides along the length of the unloading slide 12, and pulls the tension spring 15 to produce extension deformation. At the same time, the bottom of the unloading ramp 7 slides along the guide ramp to a position flush with the bottom of the bending module 4. The bending module 4 then pushes the workpiece to squeeze the bending base plate 11 into the bending groove 10, and the two ends of the workpiece fit against the inner wall of the bending groove 10, thereby achieving bending of the two ends of the workpiece.

[0034] Then, when the hydraulic rod 5 is reversed and drives the bending module 4 to disengage from the workpiece, the tension spring 15 is released from its force and pulls the double-sided rack 13 to slide along the length of the stripping chute 12. At the same time, the double-sided rack 13 meshes with the transmission gear 14 and drives the transmission gear 14 to rotate the transmission rod 6 around the hinge axis. Simultaneously, one end of the transmission rod 6 pushes the inner wall of the follower chute 9 to form contact with the transmission protrusion 8, and drives the stripping inclined platform 7 to slide downward along the guide slope of the bending module 4. At the same time, the stripping inclined platform 7 pushes one end of the workpiece to disengage from the bottom of the bending module 4, so that the surface of the workpiece quickly disengages from the bending module 4, effectively reducing the labor intensity of the workers and improving the processing efficiency of the device.

[0035] Reference Figure 1 - Figure 3 The lifting mechanism includes an arc-shaped cylindrical groove 16 symmetrically opened inside the bending groove 10. A bending roller 17 is rotatably connected inside the arc-shaped cylindrical groove 16. A right-angle groove 18 is opened at one end of the bending roller 17. A transmission component is installed at one end of the bending roller 17. A lifting component is installed at one end of the machine tool 1.

[0036] The transmission assembly includes a pair of transmission racks 20 symmetrically mounted on one end of the machine tool 1, a synchronizing rod 21 fixedly connected to the bottom of the two adjacent transmission racks 20, and a transmission gear 19 symmetrically fixedly connected to one end of the bending roller 17 to mesh with the transmission racks 20.

[0037] Furthermore, the lifting assembly includes a lifting slide rod 22 symmetrically fixedly connected to one end of the synchronizing rod 21. One end of the lifting slide rod 22 is slidably connected to the machine tool 1. A lifting spring 23 is sleeved on one end of the lifting slide rod 22. The lifting spring 23 is installed between the synchronizing rod 21 and the machine tool 1.

[0038] In use, when the hydraulic rod 5 is activated to drive the bending module 4 to push the workpiece to press the bending base plate 11, the bending base plate 11 causes the workpiece to be embedded in the bending groove 10, and both ends of the workpiece abut against the inner wall of the bending groove 10, forming a bending effect. At the same time, one end of the bending base plate 11 is embedded in the right angle groove 18, and the bending roller 17 is driven to rotate. At the same time, one end of the bending roller 17 abuts against the workpiece, so as to form a secondary bend for the workpiece and improve the bending effect of the workpiece. Meanwhile, the bending roller 17 drives the transmission gear 19 to mesh with the transmission rack 20, and the transmission rack 20 drives the synchronous rod 21 to move upward along the length of the lifting slide rod 22. At the same time, the synchronous rod 21 compresses the lifting spring 23 to produce a contraction deformation.

[0039] Then, when the bending module 4 releases its contact with the workpiece, the lifting spring 23 is released from its force and undergoes a rebound deformation. At the same time, the lifting spring 23 pushes the synchronizing rod 21 to move downward along the length of the lifting slide rod 22. Simultaneously, the synchronizing rod 21 drives the transmission rack 20 to mesh with the transmission gear 19, thereby causing the transmission gear 19 to drive the bending roller 17 to rotate in the opposite direction. This causes one end of the bending roller 17 to push the bending base plate 11 to slide upward along the inner wall of the bending groove 10, thereby achieving automatic reset of the bending base plate 11 and effectively improving the practicality of the device.

[0040] Reference Figure 1 - Figure 3 The top four corners of the machine tool 1 are equipped with abutting sliders 24. Abutting sliders 25 are slidably inserted into one end of the abutting sliders 24. A limit plate 26 is fixedly connected to the bottom of the abutting sliders 25. A limit spring 27 is sleeved on one end of the abutting sliders 25. The limit spring 27 is installed between the limit plate 26 and the abutting sliders 24.

[0041] Among them, the top four corners of the machine tool 1 are rotatably connected with adjusting rods 28, one end of the adjusting rod 28 is provided with an adjusting groove 29, and the abutting slider 24 is slidably connected inside the adjusting groove 29.

[0042] In use, after placing the workpiece on top of the machine tool 1, first rotate the adjusting rod 28 to move the limiting plate 26 above the workpiece. Then, according to the actual size of the workpiece, manually push the abutting slider 24 to slide along the length of the adjusting groove 29 to a suitable position. Next, using the elastic characteristics of the limiting spring 27, the limiting spring 27 rebounds and pushes the limiting plate 26, causing the limiting plate 26 to drive the abutting slider 25 to slide downward, so that the limiting plate 26 abuts against the top of the workpiece. This facilitates the initial fixation of the workpiece, thereby reducing the possibility of the workpiece becoming loose and causing deviation due to bending, and improving the accuracy of the device.

[0043] The implementation principle of the elevator counterweight shell bending device in this embodiment is as follows: First, the workpiece is placed on the top of the bending base plate 11. Then, the adjusting rod 28 is rotated to move the limiting plate 26 above the workpiece. Then, according to the actual size of the workpiece, the abutting slider 24 is manually pushed to slide along the length direction of the adjusting groove 29 to a suitable position. Then, the elastic characteristics of the limiting spring 27 are used to make the limiting spring 27 rebound and push the limiting plate 26, and make the limiting plate 26 drive the abutting slider 25 to slide downward, so that the limiting plate 26 abuts against the top of the workpiece.

[0044] Then, the hydraulic rod 5 is activated to drive the bending module 4 to move downward along the length of the bending slide rod 3, and to drive the stripping ramp 7 to fit against the top of the workpiece. The stripping ramp 7 drives the transmission protrusion 8 to slide along the guide ramp of the bending module 4, while the transmission protrusion 8 fits against the inner wall of the follower slide 9, and drives the transmission rod 6 to rotate around the hinge axis. The transmission rod 6 drives the transmission gear 14 to mesh with the double-sided rack 13, while the double-sided rack 13 slides along the length of the stripping slide 12 and pulls the tension spring 15 to produce extension deformation. At the same time, the bottom of the stripping ramp 7 slides along the guide ramp to a position flush with the bottom of the bending module 4, and cooperates with the bending module 4 to push the workpiece to squeeze the bending base plate 11 to slide into the bending groove 10. At the same time, the two ends of the workpiece fit against the inner wall of the bending groove 10, thereby achieving the bending of the two ends of the workpiece.

[0045] At the same time, when the bending base plate 11 drives the workpiece to be embedded in the bending groove 10, one end of the bending base plate 11 is embedded in the right angle groove 18, and pushes the bending roller 17 to rotate. At the same time, one end of the bending roller 17 comes into contact with the workpiece, so as to form a secondary bend on the workpiece and improve the bending effect of the workpiece. Meanwhile, the bending roller 17 drives the transmission gear 19 to mesh with the transmission rack 20, and the transmission rack 20 drives the synchronous rod 21 to move upward along the length direction of the lifting slide rod 22. At the same time, the synchronous rod 21 compresses the lifting spring 23 to produce a contraction deformation.

[0046] Then, when the reverse-starting hydraulic rod 5 drives the bending module 4 to disengage from the workpiece, the tension spring 15 is released from its force and pulls the double-sided rack 13 to slide along the length of the stripping chute 12. At the same time, the double-sided rack 13 meshes with the transmission gear 14 and drives the transmission gear 14 to rotate the transmission rod 6 around the hinge axis. Meanwhile, one end of the transmission rod 6 pushes the inner wall of the follower chute 9 to form contact with the transmission protrusion 8, and drives the stripping ramp 7 to slide down along the guide ramp of the bending module 4. At the same time, the stripping ramp 7 pushes one end of the workpiece to disengage from the bottom of the bending module 4, so that the surface of the workpiece quickly disengages from the bending module 4.

[0047] Simultaneously, when the bending module 4 releases its contact with the workpiece, the lifting spring 23 is released from its force and undergoes a rebound deformation. At the same time, the lifting spring 23 pushes the synchronizing rod 21 to move downward along the length of the lifting slide rod 22. Simultaneously, the synchronizing rod 21 drives the transmission rack 20 to mesh with the transmission gear 19, thereby causing the transmission gear 19 to drive the bending roller 17 to rotate in the opposite direction. This causes one end of the bending roller 17 to push the bending base plate 11 to slide upward along the inner wall of the bending groove 10, thereby achieving automatic reset of the bending base plate 11.

Claims

1. A bending device for elevator counterweight shells, comprising a machine tool (1), characterized in that: One end of the machine tool (1) is fixedly connected to a top platform (2), and a pair of bending slide rods (3) are movably passed through one end of the top platform (2). A bending module (4) is fixedly connected to the bottom of the two bending slide rods (3). A hydraulic rod (5) is fixedly connected to one end of the top platform (2). The output end of the hydraulic rod (5) is fixedly connected to the bending module (4). A transmission rod (6) is symmetrically hinged to one end of the bending module (4), and a stripping inclined table (7) is symmetrically slidably connected to one end of the bending module (4). One end of the unloading ramp (7) is symmetrically fixedly connected with a transmission protrusion (8). One end of the transmission rod (6) is provided with a follower slide groove (9) adapted to the transmission protrusion (8). The top of the machine tool (1) is provided with a bending groove (10). A bending base plate (11) is slidably connected inside the bending groove (10). The bending base plate (11) is installed below the bending module (4). One end of the bending module (4) is equipped with an unloading component. One end of the machine tool (1) is equipped with a lifting mechanism.

2. The elevator counterweight shell bending device according to claim 1, characterized in that: The material removal assembly includes a material removal groove (12) symmetrically opened at one end of the bending module (4). A double-sided rack (13) is slidably connected inside the material removal groove (12). A transmission gear (14) that meshes with the double-sided rack (13) is fixedly connected to the hinge shaft end of the transmission rod (6) and the bending module (4). A tension spring (15) is fixedly connected to one end of the bending module (4). The bottom of the tension spring (15) is fixedly connected to the double-sided rack (13).

3. The elevator counterweight shell bending device according to claim 1, characterized in that: The lifting mechanism includes an arc-shaped cylindrical groove (16) symmetrically opened inside the bending groove (10). A bending roller (17) is rotatably connected inside the arc-shaped cylindrical groove (16). A right-angle groove (18) is opened at one end of the bending roller (17). A transmission component is installed at one end of the bending roller (17). A lifting component is installed at one end of the machine tool (1).

4. The elevator counterweight shell bending device according to claim 3, characterized in that: The transmission assembly includes a pair of transmission racks (20) symmetrically mounted on one end of the machine tool (1), and a synchronizing rod (21) is fixedly connected to the bottom of the two adjacent transmission racks (20). A second transmission gear (19) that meshes with the transmission racks (20) is symmetrically fixedly connected to one end of the bending roller (17).

5. The elevator counterweight shell bending device according to claim 4, characterized in that: The lifting assembly includes a lifting slide rod (22) symmetrically fixedly connected to one end of the synchronizing rod (21). One end of the lifting slide rod (22) is slidably connected to the machine tool (1). A lifting spring (23) is sleeved on one end of the lifting slide rod (22). The lifting spring (23) is installed between the synchronizing rod (21) and the machine tool (1).

6. The elevator counterweight shell bending device according to claim 1, characterized in that: The machine tool (1) is equipped with four abutment sliders (24) at the top corners. Abutment slider (25) is slidably inserted at one end of the abutment slider (24). A limit plate (26) is fixedly connected to the bottom of the abutment slider (25). A limit spring (27) is sleeved at one end of the abutment slider (25). The limit spring (27) is installed between the limit plate (26) and the abutment slider (24).

7. The elevator counterweight shell bending device according to claim 6, characterized in that: The machine tool (1) has four rotatably connected adjustment rods (28) at the top corners. One end of the adjustment rod (28) is provided with an adjustment groove (29), and the abutment slider (24) is slidably connected inside the adjustment groove (29).

Images