A twist drill with a shank lengthening structure

Abstract

The application relates to the technical field of drill bits, in particular to a twist drill bit with a lengthened tool shank structure, which comprises a drilling machine, a mounting head is rotationally connected to the drilling machine, a lengthened tool shank is mounted on the mounting head, a fixing ring is sleeved on the drilling machine, fixing rods are fixedly connected to the two sides of the fixing ring, and an outer disc is fixedly connected to the end portions of the two fixing rods. The device is used for pre-blowing and cleaning the drilling area through a blowing piece, multiple telescopic rods and a nozzle, guarantees the drilling centering precision of the twist drill, can automatically switch the blowing state of the nozzle along with the drilling operation, blows the generated drilling debris away laterally, and through the linkage of a rack and pinion mechanism and the like, a large hole replaces a small hole and is communicated with a channel, self-adaptive adjustment of the air outlet intensity during the deepening of the drilling is realized, the accumulation of the debris is effectively avoided to cause the burning of the drill and the jamming of the debris, and the intensified cleaning of the debris and the cooling demand under the deep hole working condition are met.

Description

Technical Field

[0001] This invention relates to the field of drill bit technology, specifically to a twist drill bit with an extended shank structure. Background Technology

[0002] Twist drills are the most widely used and versatile solid hole machining tools in the machining field. They are named for the spiral-shaped chip removal grooves on the shank, which give them a twisted, spiral-like appearance. They are mainly used for machining cylindrical through holes and blind holes in metal and non-metal workpieces. They are the core component in the drilling process and are widely used in precision manufacturing, engineering machinery, hardware processing, construction, equipment assembly, and many other industries. They are also one of the preferred tools for hole machining in industrial production.

[0003] In deep hole drilling operations using extended twist drills, existing drilling equipment generally lacks a dedicated chip removal mechanism. This results in chips generated by the twist drill not being blown away from the hole opening in a timely manner, easily accumulating at the opening and even falling back into the hole. This not only causes blockage of the chip removal groove but also leads to problems such as secondary cutting, tool burning, and hole wall scratches. Especially in deep hole conditions, the chip removal path is longer, making the chip accumulation problem more prominent and seriously affecting drilling efficiency and quality. Summary of the Invention

[0004] The purpose of this invention is to provide a twist drill bit with an extended shank structure, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a twist drill bit with an extended shank structure, comprising a drill rig, an mounting head rotatably connected to the drill rig, an extended shank mounted on the mounting head, a fixing ring sleeved on the drill rig, fixing rods fixedly connected to both sides of the fixing ring, an outer disk fixedly connected to the ends of the two fixing rods, an inner turntable rotatably connected to the outer disk, the middle portion of the inner turntable sleeved on the outer side wall of the extended shank, a sleeve fixedly connected to the end of the extended shank, and a [missing information - likely a component or part] installed inside the sleeve. A convex head is fixedly connected to a twist drill. A sway disconnection mechanism is provided on the sleeve. Multiple telescopic rods are fixedly connected to the outer side wall of the outer disc. The multiple telescopic rods are hollow. A blower is connected to the end of the multiple telescopic rods. A fan is provided inside the blower. The end of the multiple telescopic rods away from the blower is slidably connected to the bottom cylinder. A chip blowing mechanism is provided on the bottom cylinder. The chip blowing mechanism includes an air jet box installed on the bottom cylinder. An air vent is connected inside the air jet box and the air vent is connected to the inside of the bottom cylinder.

[0006] Preferably, the end of the vent pipe is connected to a channel, a shaping tube is connected to the channel, and a nozzle is connected to the end of the shaping tube. Both sides of the nozzle are rotatably connected to swing arms. A sliding groove is fixedly connected to the outer wall of the air jet box. A transverse component is slidably connected inside the sliding groove. The end of the swing arm away from the nozzle is rotatably connected to the outer wall of the transverse component. A pressing spring is fixedly connected to the outer wall of the transverse component. The end of the pressing spring away from the transverse component is fixedly connected to the inner wall of the sliding groove.

[0007] Preferably, a collar is sleeved at the end of the multi-section telescopic rod, a bracket is fixedly connected to the outer wall of the collar, a roller is rotatably connected to the end of the bracket, the roller slides in contact with the surface of the transverse member, and a return spring is fixedly connected to the outer wall of the collar, with the end of the return spring away from the collar in contact with the bottom cylinder.

[0008] Preferably, the side wall of the jet box is provided with a side box, and a sliding plate is slidably connected through the channel and the side box. The end of the sliding plate slides through to the outside of the jet box, and the sliding plate is provided with small holes and large holes.

[0009] Preferably, a rotating rod is rotatably connected through the inside of the side box, and a driving thread is opened on one side of the rotating rod inside the side box. A gear is fixedly connected to one end of the rotating rod outside the side box. A driving component is fixedly connected to the outer wall of the slide plate. The middle part of the driving component is threaded onto the driving thread. A rack is fixedly connected to the multi-section telescopic rod, and the rack and the gear are meshed.

[0010] Preferably, the sway disconnection mechanism includes multiple wedge-shaped parts slidably connected to the sleeve, with spring rods fixedly connected to both sides of each wedge-shaped part, a pressure plate slidably connected to the outer wall of the sleeve, multiple pressure rods corresponding to the wedge-shaped parts fixedly connected to the outer wall of the pressure plate, and an insertion port corresponding to the wedge-shaped parts provided on the protrusion.

[0011] Preferably, mounting components are fixedly connected to both sides of the sleeve, an electric push rod is fixedly connected to the outer wall of the mounting component, the end of the electric push rod is fixedly connected to the pressure plate, and a sway detection sensor is provided inside the sleeve.

[0012] Preferably, a limiting rod is fixedly connected to the outer side wall of the collar, and a return spring is sleeved on the limiting rod. The upper end of the return spring is slidably connected to the outer disc.

[0013] Preferably, a plurality of side plates are fixedly connected to the outer side wall of the fixing ring, and bolts are rotatably connected to each of the plurality of side plates. A rotating cap is fixedly connected to the end of each bolt. A limit track is provided on the outer side wall of the side plate, and a support member is slidably connected inside the limit track. A clamping and fixing plate is fixedly connected to the support member, and the clamping and fixing plate is rotatably connected to the end of the bolt.

[0014] Preferably, a ball head is installed at the bottom of the bottom cylinder, and a chassis is fixedly connected to the ball head.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This device uses a blower, multi-section telescopic rod, and nozzle to pre-purge and clean the area to be drilled, ensuring the centering accuracy of the twist drill. It can automatically switch the blowing state of the nozzle during drilling operations to blow away the debris generated during drilling. At the same time, through the linkage of rack and gear mechanisms, the larger hole replaces the smaller hole and connects with the channel, realizing adaptive adjustment of the air intensity as the drilling depth increases. This effectively avoids the failure of cutting tool burning and chip blockage caused by chip accumulation, and meets the requirements of enhanced chip removal and cooling in deep hole conditions.

[0017] 2. This device uses a fixed rod to radially limit and constrain the extended tool holder, which can suppress the wobble during the twist drill's drilling process. When the twist drill is damaged and wobble occurs, the wobble detection sensor can drive the electric push rod and pressure plate to move, causing the pressure rod to quickly exit the insertion port, instantly interrupting the power transmission path to release the power input of the twist drill and prevent the wobble from aggravating the damage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a partial structural diagram of the present invention. Figure 1 ;

[0020] Figure 3 This is a partial structural diagram of the present invention. Figure 2 ;

[0021] Figure 4 This is a schematic diagram of the front structure of the present invention;

[0022] Figure 5 This is a partial structural diagram of the present invention. Figure 3 ;

[0023] Figure 6 This is a partial structural diagram of the present invention. Figure 4 ;

[0024] Figure 7 This is a schematic diagram of the back structure of the jet box of the present invention;

[0025] Figure 8 This is a schematic diagram of the structure of the present invention;

[0026] Figure 9 This is a schematic diagram of the internal structure of the multi-section telescopic rod of the present invention.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Drilling rig; 2. Retaining ring; 3. Mounting head; 4. Side plate; 5. Bolt; 6. Clamping and fixing plate; 7. Rotary cap; 8. Fixing rod; 9. Outer disc; 10. Sleeve; 11. Twist drill; 12. Inner rotary disc; 13. Extended tool holder; 14. Pressure plate; 15. Electric push rod; 16. Wedge; 17. Pressure rod; 18. Protrusion head; 19. Insert; 20. Multi-section telescopic rod; 21. Limiting rod; 22. Return spring; 23. Blower; 24. 25. Base tube; 26. Return spring; 27. Ball head; 28. Chassis; 29. ​​Collar; 30. Rack; 31. Drive component; 32. Bracket; 33. Roller; 34. Nozzle; 35. Shaping tube; 36. Swing arm; 37. Pressing spring; 38. Lateral component; 39. Slide groove; 40. Air vent; 41. Air jet box; 42. Channel; 43. Slide plate; 44. Small hole; 45. Drive thread; 46. Side box; 47. Gear; 48. Large hole. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figures 1-9A twist drill bit with an extended handle structure includes a drill rig 1, a mounting head 3 rotatably connected to the drill rig 1, an extended handle 13 mounted on the mounting head 3, a fixing ring 2 sleeved on the drill rig 1, fixing rods 8 fixedly connected to both sides of the fixing ring 2, an outer disk 9 fixedly connected to the ends of the two fixing rods 8, an inner turntable 12 rotatably connected to the outer disk 9, the middle part of the inner turntable 12 sleeved on the outer side wall of the extended handle 13, a sleeve 10 fixedly connected to the end of the extended handle 13, a protrusion 18 installed inside the sleeve 10, and a component fixedly connected to the protrusion 18. The twist drill 11 and the sleeve 10 are equipped with a swing disconnection mechanism. A multi-section telescopic rod 20 is fixedly connected to the outer wall of the outer plate 9. The multi-section telescopic rod 20 is hollow. A blower 23 is connected to the end of the multi-section telescopic rod 20. A fan is installed inside the blower 23. The end of the multi-section telescopic rod 20 away from the blower 23 is slidably connected to the bottom cylinder 24. A chip blowing mechanism is provided on the bottom cylinder 24. The chip blowing mechanism includes an air jet box 40 installed on the bottom cylinder 24. An air vent 39 is connected inside the air jet box 40 and connects to the inside of the bottom cylinder 24.

[0031] The end of the vent pipe 39 is connected to a channel 41, and a shaping tube 34 is connected to the channel 41. The end of the shaping tube 34 is connected to a nozzle 33. Both sides of the nozzle 33 are rotatably connected to swing arms 35. A slide groove 38 is fixedly connected to the outer wall of the air jet box 40. A transverse member 37 is slidably connected inside the slide groove 38. The end of the swing arm 35 away from the nozzle 33 is rotatably connected to the outer wall of the transverse member 37. A pressing spring 36 is fixedly connected to the outer wall of the transverse member 37. The end of the pressing spring 36 away from the transverse member 37 is fixedly connected to the inner wall of the slide groove 38.

[0032] The end of the multi-section telescopic rod 20 is fitted with a collar 28. A bracket 31 is fixedly connected to the outer wall of the collar 28. A roller 32 is rotatably connected to the end of the bracket 31. The roller 32 slides in contact with the surface of the transverse member 37. A return spring 25 is fixedly connected to the outer wall of the collar 28. The end of the return spring 25 away from the collar 28 contacts the bottom cylinder 24.

[0033] A side box 45 is provided on the side wall of the jet box 40. A slide plate 42 is slidably connected through the channel 41 and the side box 45. The end of the slide plate 42 slides through to the outside of the jet box 40. A small hole 43 and a large hole 47 are provided on the slide plate 42.

[0034] A rotating rod is rotatably connected through the inside of the side box 45. A drive thread 44 is opened on one side of the rotating rod inside the side box 45. A gear 46 is fixedly connected to one end of the rotating rod outside the side box 45. A drive member 30 is fixedly connected to the outer wall of the slide plate 42. The middle part of the drive member 30 is threaded onto the drive thread 44. A rack 29 is fixedly connected to the multi-section telescopic rod 20. The rack 29 and the gear 46 are meshed.

[0035] In this embodiment, during use, the operator can put the fixing ring 2 on the outside of the drill 1. After the ring is put on, rotate the rotating cap 7. The rotating cap 7 drives the bolt 5 to rotate. The bolt 5 drives the clamping and fixing plate 6 to clamp and fix the drill 1, thus completing the assembly of the fixing ring 2. Then, insert the protrusion 18 into the sleeve 10 and align the insertion port 19 with the wedge 16. Control the electric push rod 15 to extend. The electric push rod 15 pushes the pressure plate 14 to move the pressure rod 17 away from the outer plate 9. The pressure rod 17 presses the wedge 16 to insert it into the insertion port 19, thus completing the linkage assembly of the protrusion 18 and the twist drill 11.

[0036] After assembly, the twist drill 11 is aligned with the position to be drilled. In its natural extended state, the length of the multi-section telescopic rod 20 is greater than that of the twist drill 11. During drilling, the base 27 first contacts the surface of the hole to be drilled before the twist drill 11. At this time, the fan inside the blower 23 is started to run at high speed. The airflow generated by the fan is delivered to the multi-section telescopic rod 20, guided by the bottom cylinder 24, and sent into the channel 41 of the air jet box 40 through the air pipe 39. Then it enters the shaping tube 34 through the small hole 43, and finally blows obliquely towards the plane of the hole to be drilled by the nozzle 33 to pre-blow and clean the area to be drilled, remove surface dust and impurities, and avoid impurities affecting the drilling centering accuracy of the twist drill 11.

[0037] After the nozzle 33 completes the pre-purging of the area to be drilled, the drill rig 1 is controlled to move down and drive the mounting head 3 to rotate. The mounting head 3 drives the sleeve 10 to rotate through the extended handle 13, which in turn drives the twist drill 11 to rotate to carry out the drilling operation. Since the elastic force of the return spring 25 is less than that of the return spring 22, the return spring 25 contracts when the drill rig 1 moves down, and the multi-section telescopic rod 20 slides into the bottom cylinder 24. The multi-section telescopic rod 20 drives the bracket 31 to move down synchronously. During the downward movement of the bracket 31, the roller 32 rolls along the inclined surface of the transverse member 37, pushing the transverse member 37 to move closer to the bottom cylinder 24. The transverse member 37 pulls the nozzle 33 to flip through the swing arm 35, so that the nozzle 33 changes from the inclined purging state to the vertical lateral purging state. The airflow direction changes from oblique to straight lateral at the same time, and the debris generated by the twist drill 11 is blown away laterally to avoid debris accumulation at the hole opening, which may cause tool burning, chip blockage and other faults.

[0038] As the drill rig 1 continues to move downwards, the drilling depth of the twist drill 11 increases, the chip removal path is correspondingly extended, the chip removal difficulty increases, and the chips are more likely to accumulate. Under the continuous downward pressure of the drill rig 1, the multi-section telescopic rod 20 gradually retracts. When the drilling depth reaches the preset middle position, the rack 29 meshes with the gear 46. During the continuous feeding of the drill rig 1 and the continuous drilling of the twist drill 11, the rack 29 drives the gear 46 to rotate, the gear 46 drives the rotating rod to rotate, and the rotating rod drives the drive component 30 to move through the drive thread 44. The drive component 30 pushes the slide plate 42 to move into the channel 41, so that the large hole 47 replaces the small hole 43 and connects with the channel 41. Since the diameter of the large hole 47 is larger than that of the small hole 43, the air flow rate entering the shaping tube 34 increases accordingly, and the air output intensity of the nozzle 33 is significantly improved compared with the early stage of drilling, which can meet the requirements of enhanced chip removal and cooling under deep hole conditions.

[0039] Example 2: Please refer to Figures 1-9 The sway disconnection mechanism includes multiple wedge-shaped pieces 16 slidably connected to the sleeve 10. Spring rods are fixedly connected to both sides of the multiple wedge-shaped pieces 16. A pressure plate 14 is slidably connected to the outer wall of the sleeve 10. Multiple pressure rods 17 corresponding to the wedge-shaped pieces 16 are fixedly connected to the outer wall of the pressure plate 14. An insertion port 19 corresponding to the wedge-shaped pieces 16 is opened on the protrusion 18.

[0040] Mounting components are fixedly connected to both sides of the sleeve 10. An electric push rod 15 is fixedly connected to the outer wall of the mounting component. The end of the electric push rod 15 is fixedly connected to the pressure plate 14. A sway detection sensor is installed inside the sleeve 10.

[0041] A limiting rod 21 is fixedly connected to the outer wall of the collar 28. A return spring 22 is sleeved on the limiting rod 21. The upper end of the return spring 22 is slidably connected to the outer disk 9.

[0042] Multiple side plates 4 are fixedly connected to the outer wall of the fixed ring 2. Bolts 5 are rotatably connected to each of the multiple side plates 4. A rotating cap 7 is fixedly connected to the end of the bolt 5. A limit track is opened on the outer wall of the side plate 4. A support member is slidably connected inside the limit track. A clamping and fixing plate 6 is fixedly connected to the support member. The clamping and fixing plate 6 is rotatably connected to the end of the bolt 5.

[0043] A ball head 26 is installed at the bottom of the bottom cylinder 24, and a chassis 27 is fixedly connected to the ball head 26.

[0044] In this embodiment, during the drilling process, the fixing rod 8 uses its own rigidity to radially limit and constrain the rotating extended tool holder 13, suppressing the wobble of the extended tool holder 13 and the twist drill 11 during drilling. When the twist drill 11 wobbles beyond the limit due to drill tip damage or centering failure, the wobble detection sensor built into the sleeve 10 detects the wobble signal in real time and drives the electric push rod 15 to retract (this is prior art and will not be elaborated further). The electric push rod 15 drives the pressure plate 14 to move upward, and the pressure plate 14 causes the pressure rod 17 to disengage from the top pressure engagement with the wedge 16. Under the action of the elastic rod, the pressure rod 17 quickly exits the socket 19, and the power transmission path between the protrusion 18 and the sleeve 10 is interrupted instantaneously. The power input of the twist drill 11 is quickly released, avoiding the increased wobble that could cause tool damage, workpiece scrap, and equipment failure.

[0045] In this device, the fan inside the blower 23 is driven by a permanent magnet brushless motor, resulting in minimal vibration during operation. Furthermore, the connection between the blower 23 and the multi-section telescopic rod 20 is equipped with a shock-absorbing silicone pad, which can effectively absorb and attenuate the vibration generated by the fan operation, preventing the vibration from being transmitted to the outer plate 9 (shown in the figure) and ensuring the stability of the drilling operation.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A twist drill bit with an extended shank structure, comprising a drill (1), characterized in that, The drilling rig (1) is rotatably connected to an installation head (3), and an extended tool holder (13) is installed on the installation head (3). A fixing ring (2) is fitted onto the drilling rig (1), and fixing rods (8) are fixedly connected to both sides of the fixing ring (2). An outer disk (9) is fixedly connected to the ends of the two fixing rods (8). An inner turntable (12) is rotatably connected to the outer disk (9). The middle part of the inner turntable (12) is fitted onto the outer wall of the extended tool holder (13). A sleeve (10) is fixedly connected to the end of the extended tool holder (13). A protrusion (18) is installed inside the sleeve (10), and a twist drill (11) is fixedly connected to the protrusion (18). A sway disconnection mechanism is provided on the sleeve (10). Multiple telescopic rods (20) are fixedly connected to the outer side wall of the outer disk (9). The multiple telescopic rods (20) are hollow. A blower (23) is connected to the end of the multiple telescopic rods (20). A fan is provided inside the blower (23). The end of the multiple telescopic rods (20) away from the blower (23) is slidably connected to the bottom cylinder (24). A chip blowing mechanism is provided on the bottom cylinder (24). The chip blowing mechanism includes an air jet box (40) installed on the bottom cylinder (24). An air vent (39) is connected inside the air jet box (40). The air vent (39) is connected to the inside of the bottom cylinder (24). The end of the vent pipe (39) is connected to a channel (41), and a shaping tube (34) is connected to the channel (41). The end of the shaping tube (34) is connected to a nozzle (33). Both sides of the nozzle (33) are rotatably connected to swing arms (35). A slide groove (38) is fixedly connected to the outer wall of the air jet box (40). A transverse member (37) is slidably connected inside the slide groove (38). The end of the swing arm (35) away from the nozzle (33) is rotatably connected to the outer wall of the transverse member (37). A pressing spring (36) is fixedly connected to the outer wall of the transverse member (37). The end of the pressing spring (36) away from the transverse member (37) is fixedly connected to the inner wall of the slide groove (38). The end of the multi-section telescopic rod (20) is fitted with a collar (28), and a bracket (31) is fixedly connected to the outer wall of the collar (28). A roller (32) is rotatably connected to the end of the bracket (31). The roller (32) slides in contact with the surface of the transverse member (37). A return spring (25) is fixedly connected to the outer wall of the collar (28). The end of the return spring (25) away from the collar (28) contacts the bottom cylinder (24). The side wall of the jet box (40) is provided with a side box (45), and a sliding plate (42) is slidably connected through the channel (41) and the side box (45). The end of the sliding plate (42) slides through to the outside of the jet box (40), and a small hole (43) and a large hole (47) are provided on the sliding plate (42). A rotating rod is rotatably connected through the inside of the side box (45). A drive thread (44) is provided on one side of the rotating rod inside the side box (45). A gear (46) is fixedly connected to one end of the rotating rod outside the side box (45). A drive member (30) is fixedly connected to the outer wall of the slide plate (42). The middle part of the drive member (30) is threaded onto the drive thread (44). A rack (29) is fixedly connected to the multi-section telescopic rod (20). The rack (29) and the gear (46) are meshed.

2. A twist drill bit with an extended shank structure according to claim 1, characterized in that: The sway disconnection mechanism includes multiple wedge-shaped pieces (16) slidably connected to the sleeve (10). Spring rods are fixedly connected to both sides of the multiple wedge-shaped pieces (16). A pressure plate (14) is slidably connected to the outer wall of the sleeve (10). Multiple pressure rods (17) corresponding to the wedge-shaped pieces (16) are fixedly connected to the outer wall of the pressure plate (14). An insertion port (19) corresponding to the wedge-shaped pieces (16) is opened on the protrusion (18).

3. A twist drill bit with an extended shank structure according to claim 1, characterized in that: Both sides of the sleeve (10) are fixedly connected to mounting parts, and an electric push rod (15) is fixedly connected to the outer wall of the mounting part. The end of the electric push rod (15) is fixedly connected to the pressure plate (14). A sway detection sensor is provided inside the sleeve (10).

4. A twist drill bit with an extended shank structure according to claim 1, characterized in that: A limiting rod (21) is fixedly connected to the outer wall of the collar (28), and a return spring (22) is sleeved on the limiting rod (21). The upper end of the return spring (22) is slidably connected to the outer disk (9).

5. A twist drill bit with an extended shank structure according to claim 1, characterized in that: Multiple side plates (4) are fixedly connected to the outer side wall of the fixed ring (2). Bolts (5) are rotatably connected to the multiple side plates (4). A rotating cap (7) is fixedly connected to the end of the bolt (5). A limit track is opened on the outer side wall of the side plate (4). A support member is slidably connected inside the limit track. A clamping and fixing plate (6) is fixedly connected to the support member. The clamping and fixing plate (6) is rotatably connected to the end of the bolt (5).

6. A twist drill bit with an extended shank structure according to claim 1, characterized in that: A ball head (26) is installed at the bottom of the bottom cylinder (24), and a chassis (27) is fixedly connected to the ball head (26).

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