A hand-held drill for use in confined spaces

Abstract

The application relates to the technical field of drilling equipment, and particularly discloses a handheld drilling machine applied to narrow space, which comprises a handle part, a telescopic arm part, a drill bit part and a power motor, the handle part and the drill bit part are respectively connected with the two ends of the telescopic arm part, a rotor is arranged in the drill bit part, a drill bit arranged to extend from the drill bit part is detachably arranged on the rotor, a telescopic transmission shaft is arranged in the telescopic arm part, the two ends of the telescopic transmission shaft are respectively in transmission connection with the rotor and the power motor, a telescopic support frame for applying pressure is arranged on the side of the telescopic arm part far from the drill bit, and a manual adjusting assembly for realizing the opening or contraction of the telescopic support frame is arranged on the telescopic arm part; the disclosed handheld drilling machine effectively solves the problem that the existing electric hand drill cannot be applied to the punching demand in narrow space, has excellent use effect, is more widely applicable, and can provide stable pressure effect when drilling hard objects, so that the efficiency and punching effect of drilling are ensured.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and specifically discloses a handheld drilling machine for use in confined spaces. Background Technology

[0002] A hand drill is a drilling tool powered by AC power or DC battery. It is a type of handheld power tool and the best-selling product in the power tool industry. It is widely used in construction, decoration, furniture and other industries and is a common tool for making holes in objects.

[0003] Utility model patent application number 2022219534424 discloses a drilling device for a detection hole in a confined space, including a base plate placed on the ground. Two sets of positioning plates are fixedly installed at one end of the base plate. A support plate is hinged to the positioning plate. A support assembly is installed at the angle between the support plate and the base plate. A pushing assembly is installed on the support plate. The support assembly includes two sets of limiting plates, which are fixedly installed on the side of the support plate near the base plate. A smooth rod and a first threaded rod are installed on the side of the base plate near the support plate. The smooth rod and the first threaded rod are rotatably connected to both sides of the base plate. An adjusting block is sleeved on both the smooth rod and the first threaded rod. The adjusting block is threadedly engaged with the first threaded rod. A support rod is installed between the adjusting block and the limiting plate. The drilling device disclosed in this patent controls the movement of the adjusting block on the first threaded rod by rotating the first threaded rod. This movement, due to the threaded engagement of the adjusting block with the first threaded rod, controls the angle adjustment of the support rod on the support plate. When the support plate forms a perpendicular angle with the base plate, the drill and propulsion assembly are activated to drill holes in confined spaces, facilitating subsequent testing. However, this drilling device is only suitable for drilling soil in confined spaces. In industries such as decoration and furniture, handheld drilling equipment is more commonly used. While existing handheld drilling equipment is relatively small, it struggles to drill holes on the inner sidewalls of narrow spaces. Furthermore, when drilling harder objects, existing handheld drilling equipment cannot apply pressure in the drilling direction because the entire drilling device is almost entirely inserted into the narrow space, preventing the drill bit from quickly drilling into harder objects. Therefore, this application proposes a handheld drilling machine for use in confined spaces that effectively solves the aforementioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a handheld drilling machine for use in confined spaces, in order to overcome the shortcomings of existing drilling equipment and existing electric drills for drilling in confined spaces.

[0005] This invention is achieved through the following technical solution:

[0006] A handheld drilling machine for use in confined spaces includes a handle, a telescopic arm, a drill head, and a power motor. The handle and the drill head are respectively connected to both ends of the telescopic arm. The drill head has a rotor, and a drill bit extending out of the drill head is detachably mounted on the rotor. The power motor is fixedly mounted on the handle. The telescopic arm has a telescopic drive shaft, and both ends of the telescopic drive shaft are respectively connected to the rotor and the power motor for transmission.

[0007] The telescopic arm is provided with a telescopic support frame for applying pressure on the side away from the drill bit, and the telescopic arm is provided with a manual adjustment component for opening or closing the telescopic support frame.

[0008] As a further feature of the above solution, the handle portion is equipped with a battery that supplies power to the motor, and the lower end of the handle portion is equipped with a charging port for the battery.

[0009] As a further feature of the above solution, the power motor is fixedly installed on the upper end of the front side of the handle, and a switch button is provided at the middle position of the back of the handle.

[0010] As a further feature of the above solution, the handle portion has multiple hand-held grooves on the side facing the drill bit that conform to the fingers.

[0011] As a further provision of the above solution, the telescopic arm includes an outer strip-shaped housing and an inner strip-shaped housing. The inner strip-shaped housing is inserted into the inner cavity of the outer strip-shaped housing. The front and rear sides of the outer strip-shaped housing are provided with strip-shaped openings. The front and rear sides of the inner strip-shaped housing are connected to a lever block extending out of the strip-shaped opening. A locking component is provided between the lever block and the outer strip-shaped housing.

[0012] As a further feature of the above solution, the locking assembly includes a rack connected to a strip-shaped housing below the strip-shaped opening. The actuating block has two round holes, and insert rods are inserted into the two round holes. The lower ends of the two insert rods are connected to a toothed block that matches the rack. The upper ends of the two insert rods are connected to a paddle. The paddle and the actuating block are magnetically attracted and fixed together.

[0013] As a further provision of the above scheme, a first fixing block is provided at the inner end of the outer strip shell near the handle, and a second fixing block is provided at the inner end of the inner insert strip shell near the drill bit. Bearings located on the same straight line are provided on both the first fixing block and the second fixing block. The two ends of the telescopic transmission shaft are respectively rotatably connected to the bearings on the first fixing block and the second fixing block.

[0014] As a further feature of the above scheme, the telescopic transmission shaft includes a first shaft and a second shaft. The first shaft has a limit insertion hole, and the outer surface of the second shaft is provided with a limit strip that matches the limit insertion hole. The end of the first shaft is provided with a first bevel gear that meshes with the conical tooth surface on the rotor, and the end of the second shaft is provided with a second bevel gear that meshes with the drive bevel gear on the motor shaft of the power motor.

[0015] As a further provision of the above solution, the telescopic support frame includes two telescopic forks arranged in a cross configuration, parallel to each other. An abutment plate is connected to one side of the upper end of each of the two telescopic forks, and an upper slider is connected to the other side of the upper end of each of the two telescopic forks. An upper slide rail matching the upper slider is provided on the lower surface of the abutment plate. One side of the lower end of each of the two telescopic forks is rotatably connected to an outer strip-shaped housing, and a lower slider is connected to the other side of the lower end of each of the two telescopic forks. A lower slide rail matching the lower slider is provided on the outer strip-shaped housing.

[0016] As a further feature of the above solution, the manual adjustment assembly includes bearing seats fixed at both ends of the upper surface of the outer strip housing, a threaded rod rotatably connected between the two bearing seats, a threaded hole matching the threaded rod on the lower slider, and a turning cap connected to the end of the threaded rod extending out of the handle.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1) The handheld drilling machine disclosed in this invention, through its structural design including a telescopic arm and a telescopic drive shaft, allows for direct adjustment of the effective length of the entire handheld drilling machine when drilling holes in the inner side walls of narrow spaces. This enables the drill bit to extend into the inner end of the narrow space where the hole is to be drilled. Then, just like a normal electric drill, pressing the switch allows the high-speed rotating drill bit to create the corresponding hole in the object. This effectively solves the problem that existing electric drills cannot be used for drilling in narrow spaces, and it has excellent performance and a wider range of applications.

[0019] 2) The handheld drilling machine disclosed in this invention also has a telescopic support and a manual adjustment component at the upper end of the telescopic arm. When it is used for drilling the inner side wall of some hard objects in narrow spaces, the telescopic support is extended by rotating the manual adjustment component. During the extension of the telescopic support, the drill hole on the drill head moves toward the object to be drilled due to the restriction on one side of the abutment plate. This can provide a stable pressing force when drilling hard objects, ensuring the efficiency and drilling effect of the drilling process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure from the first angle of Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of the second-angle three-dimensional structure of Embodiment 1 of the present invention;

[0023] Figure 3 This is a three-dimensional structural diagram of the internal structure of the telescopic arm in this invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the internal structure of the telescopic transmission shaft in this invention;

[0025] Figure 5 For the present invention Figure 1 Enlarged structural diagram at point A;

[0026] Figure 6 This is a three-dimensional structural diagram of Embodiment 2 of the present invention.

[0027] Figure 7 This is a three-dimensional structural diagram of the telescopic support frame in Embodiment 2 of the present invention;

[0028] Figure 8 This is a three-dimensional structural diagram of the manual adjustment component in Embodiment 2 of the present invention.

[0029] in:

[0030] 100-Handle section, 101-Socket, 102-Switch button, 103-Handheld slot;

[0031] 200-Telescopic arm, 201-Outer strip shell, 202-Inner strip shell, 203-Strip opening, 204-Actuating block, 205-Rack, 206-Insertion plate rod, 207-Tooth block, 208-Pulley, 209-First fixing block, 210-Second fixing block, 211-Bearing;

[0032] 300 - Drill head, 301 - Rotor, 302 - Drill bit;

[0033] 400-Power Motor;

[0034] 500 - Telescopic drive shaft, 501 - First shaft, 502 - Second shaft, 503 - First bevel gear, 504 - Second bevel gear, 505 - Limiting strip;

[0035] 600-Telescopic support frame, 601-Telescopic fork frame, 602-Abutment plate, 603-Upper slider, 604-Upper slide rail, 605-Lower slider, 606-Lower slide rail;

[0036] 700 - Manual adjustment assembly, 701 - Bearing housing, 702 - Threaded rod, 703 - Tightening cap. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-8 This application will be described in detail with reference to the embodiments.

[0039] Example 1

[0040] Example 1 discloses a handheld drilling machine for use in confined spaces, see attached figure. Figure 1 and attached Figure 2 The main body of this handheld drill includes a handle 100, a telescopic arm 200, a drill head 300, and a power motor 400. The power motor 400 is fixedly mounted on the upper front side of the handle 100, and a battery (not shown in the figure) that supplies power to the power motor 400 is housed inside the handle 100. Additionally, a charging port 101 for the battery is provided at the lower end of the handle 100, facilitating charging of the battery inside the handle 100 via a charging plug.

[0041] In addition, a switch button 102 is provided in the middle of the back of the handle 100. Pressing the switch button 102 will turn on the circuit of the power motor 400 and start it running. In order to facilitate the use of the handheld drill, multiple hand grip grooves 103 are provided on the side of the handle 100 facing the drill head 300 to fit the fingers.

[0042] The handle 100 and the drill head 300 are connected to both ends of the telescopic arm 200, respectively. A rotor 301 is installed in the drill head 300, and a drill bit 302 extending out of the drill head 300 is detachably installed on the rotor 301. A telescopic drive shaft 500 is installed in the telescopic arm 200, and both ends of the telescopic drive shaft 500 are connected to the rotor 301 and the power motor 400, respectively.

[0043] For specific settings, please refer to the appendix. Figure 2 Appendix Figure 3 and attached Figure 5 The telescopic arm 200 includes an outer strip-shaped housing 201 and an inner strip-shaped housing 202. The inner strip-shaped housing 202 is inserted into the inner cavity of the outer strip-shaped housing 201. The outer strip-shaped housing 201 has strip-shaped openings 203 on both its front and rear sides. The inner strip-shaped housing 202 has a lever 204 extending out of the strip-shaped opening 203 connected to both its front and rear sides. A locking component is provided between the lever 204 and the outer strip-shaped housing 201.

[0044] The locking assembly includes a rack 205 connected to a strip-shaped housing 201 below the strip-shaped opening 203. The actuating block 204 has two round holes, in which insert rods 206 are inserted. The lower ends of the two insert rods 206 are connected to a toothed block 207 that matches the rack 205. The upper ends of the two insert rods 206 are connected to a lever 208. The lever 208 and the actuating block 204 are attracted and fixed by the magnetic force between two permanent magnets.

[0045] A first fixing block 209 is provided at the inner end of the outer strip housing 201 near the handle portion 100, and a second fixing block 210 is provided at the inner end of the inner insert strip housing 202 near the drill bit 300. Bearings 211 located on the same straight line are provided on both the first fixing block 209 and the second fixing block 210. Both ends of the telescopic drive shaft 500 are rotatably connected to the bearings 211 on the first fixing block 209 and the second fixing block 210, respectively.

[0046] Reference Appendix Figure 3 and attached Figure 4 The telescopic drive shaft 500 includes a first shaft 501 and a second shaft 502, which are rotatably connected to bearings 211 on the first fixed block 209 and the second fixed block 210, respectively. A limit insertion hole is provided on the first shaft 501, and a limit strip 505 matching the limit insertion hole is provided on the outer surface of the second shaft 502. A first bevel gear 503 is provided at the end of the first shaft 501, meshing with the conical tooth surface on the rotor 301; simultaneously, a second bevel gear 504 is provided at the end of the second shaft 502, meshing with the drive bevel gear on the motor shaft of the power motor 400.

[0047] When the handheld drilling machine disclosed in Embodiment 1 is used for drilling deep within narrow spaces, the two levers 208 are first lifted upwards simultaneously to separate the toothed block 207 from the rack 205. Then, the inner strip-shaped housing 202 is stretched from the outer strip-shaped housing 201 to a certain length to meet the usage requirements. Finally, the levers 208 are pressed down, and the length is fixed through the meshing action between the toothed block 207 and the rack 205. Simultaneously, due to the structural design of the telescopic drive shaft 500, the telescopic arm 200 also extends and adjusts its length during extension.

[0048] Subsequently, when using the device, the user holds the handle 100 and inserts the drill bit 300 into the narrow space, aligning the drill bit 302 with the position to be drilled. The user then presses the switch button 102 to start the power motor 400. Subsequently, under the transmission of the telescopic drive shaft 500, the rotor 301 and the drill bit 302 rotate at high speed, thus realizing the drilling process in the narrow space.

[0049] Example 2

[0050] Example 2 discloses a handheld drilling machine for use in confined spaces, see attached figure. Figure 1 and attached Figure 2 The main body of this handheld drill includes a handle 100, a telescopic arm 200, a drill head 300, and a power motor 400. The power motor 400 is fixedly mounted on the upper front side of the handle 100, and a battery (not shown in the figure) that supplies power to the power motor 400 is housed inside the handle 100. Additionally, a charging port 101 for the battery is provided at the lower end of the handle 100, facilitating charging of the battery inside the handle 100 via a charging plug.

[0051] In addition, a switch button 102 is provided in the middle of the back of the handle 100. Pressing the switch button 102 will turn on the circuit of the power motor 400 and start it running. In order to facilitate the use of the handheld drill, multiple hand grip grooves 103 are provided on the side of the handle 100 facing the drill head 300 to fit the fingers.

[0052] The handle 100 and the drill head 300 are connected to both ends of the telescopic arm 200, respectively. A rotor 301 is installed in the drill head 300, and a drill bit 302 extending out of the drill head 300 is detachably installed on the rotor 301. A telescopic drive shaft 500 is installed in the telescopic arm 200, and both ends of the telescopic drive shaft 500 are connected to the rotor 301 and the power motor 400, respectively.

[0053] For specific settings, please refer to the appendix. Figure 2 Appendix Figure 3 and attached Figure 5The telescopic arm 200 includes an outer strip-shaped housing 201 and an inner strip-shaped housing 202. The inner strip-shaped housing 202 is inserted into the inner cavity of the outer strip-shaped housing 201. The outer strip-shaped housing 201 has strip-shaped openings 203 on both its front and rear sides. The inner strip-shaped housing 202 has a lever 204 extending out of the strip-shaped opening 203 connected to both its front and rear sides. A locking component is provided between the lever 204 and the outer strip-shaped housing 201.

[0054] The locking assembly includes a rack 205 connected to a strip-shaped housing 201 below the strip-shaped opening 203. The actuating block 204 has two round holes, in which insert rods 206 are inserted. The lower ends of the two insert rods 206 are connected to a toothed block 207 that matches the rack 205. The upper ends of the two insert rods 206 are connected to a lever 208. The lever 208 and the actuating block 204 are attracted and fixed by the magnetic force between two permanent magnets.

[0055] A first fixing block 209 is provided at the inner end of the outer strip housing 201 near the handle portion 100, and a second fixing block 210 is provided at the inner end of the inner insert strip housing 202 near the drill bit 300. Bearings 211 located on the same straight line are provided on both the first fixing block 209 and the second fixing block 210. Both ends of the telescopic drive shaft 500 are rotatably connected to the bearings 211 on the first fixing block 209 and the second fixing block 210, respectively.

[0056] Reference Appendix Figure 3 and attached Figure 4 The telescopic drive shaft 500 includes a first shaft 501 and a second shaft 502, which are rotatably connected to bearings 211 on the first fixed block 209 and the second fixed block 210, respectively. A limit insertion hole is provided on the first shaft 501, and a limit strip 505 matching the limit insertion hole is provided on the outer surface of the second shaft 502. A first bevel gear 503 is provided at the end of the first shaft 501, meshing with the conical tooth surface on the rotor 301; simultaneously, a second bevel gear 504 is provided at the end of the second shaft 502, meshing with the drive bevel gear on the motor shaft of the power motor 400.

[0057] Reference Appendix Figure 6 Appendix Figure 7 and attached Figure 8 In this embodiment 2, a telescopic support 600 for applying pressure is provided on the side of the telescopic arm 200 away from the drill bit 302, and a manual adjustment component 700 is provided on the telescopic arm 200 to realize the opening or closing of the telescopic support 600.

[0058] The telescopic support 600 includes two parallel telescopic forks 601 arranged in a cross configuration. One side of the upper end of each telescopic fork 601 is connected to an abutment plate 602, and the other side of the upper end of each telescopic fork 601 is connected to an upper slider 603. The lower surface of the abutment plate 602 is provided with an upper slide rail 604 that matches the upper slider 603. One side of the lower end of each telescopic fork 601 is rotatably connected to an outer strip housing 201, and the other side of the lower end of each telescopic fork 601 is connected to a lower slider 605. The outer strip housing 201 is provided with a lower slide rail 606 that matches the lower slider 605.

[0059] The manual adjustment assembly 700 includes bearing seats 701 fixed at both ends of the upper surface of the outer strip housing 201, a threaded rod 702 rotatably connected between the two bearing seats 701, a threaded hole matching the threaded rod 702 is provided on the lower slider 605, and a screw cap 703 is connected to the end of the threaded rod 702 that extends out of the handle portion 100.

[0060] The handheld drilling machine disclosed in Embodiment 2 not only meets the needs of drilling deep inside narrow spaces by adjusting the length as in Embodiment 1, but also provides a stable pressing force when drilling hard objects, ensuring the efficiency of drilling.

[0061] In practical use, first align the drill bit on the drill head 300 with the hole to be drilled in the narrow space, then start the power motor 400 to make the drill 302 rotate at high speed to drill the hard material. At this time, the user can use the other hand to turn the screw cap 703 to make the threaded rod 702 rotate. Then, through the action between the threaded rod 702 and the threaded hole on the lower slider 605, the lower slider 605 moves along the lower slide rail 606, thereby causing the telescopic fork 601 to unfold synchronously. At this time, since the surface of the abutment plate 602 abuts against the inner wall of the narrow space, it can only force the entire handheld drill to move stably toward the surface of the object to be drilled, thereby realizing the drilling of a through hole vertically on the surface of the object, so as to obtain a stable pressing force during the drilling process.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A handheld drilling machine for use in confined spaces, characterized in that, The device includes a handle (100), a telescopic arm (200), a drill head (300), and a power motor (400). The handle (100) and the drill head (300) are respectively connected to both ends of the telescopic arm (200). The drill head (300) is provided with a rotor (301), and a drill bit (302) extending out of the drill head (300) is detachably installed on the rotor (301). The power motor (400) is fixedly installed on the handle (100). The telescopic arm (200) is provided with a telescopic drive shaft (500), and both ends of the telescopic drive shaft (500) are respectively connected to the rotor (301) and the power motor (400). The telescopic arm (200) is provided with a telescopic support (600) for applying pressure on one side away from the drill bit (302), and the telescopic arm (200) is provided with a manual adjustment component (700) for opening or retracting the telescopic support (600). The telescopic arm (200) includes an outer strip-shaped housing (201) and an inner strip-shaped housing (202). The inner strip-shaped housing (202) is inserted into the inner cavity of the outer strip-shaped housing (201). The outer strip-shaped housing (201) has strip-shaped openings (203) on both its front and rear sides. The inner strip-shaped housing (202) has a toggle block (204) extending out of the strip-shaped opening (203) connected to both its front and rear sides. A locking component is provided between the toggle block (204) and the outer strip-shaped housing (201). The locking assembly includes a rack (205) connected to a strip housing (201) below the strip opening (203). The actuating block (204) has two round holes, in which insert rods (206) are inserted. The lower ends of the two insert rods (206) are connected to a toothed block (207) that matches the rack (205). The upper ends of the two insert rods (206) are connected to a paddle (208). The paddle (208) and the actuating block (204) are magnetically attracted and fixed together.

2. The handheld drilling machine for use in confined spaces according to claim 1, characterized in that, The handle (100) is equipped with a battery that supplies power to the motor (400), and the lower end of the handle (100) is provided with a charging port (101) for the battery.

3. The handheld drilling machine for use in confined spaces according to claim 1, characterized in that, The power motor (400) is fixedly installed on the upper end of the front side of the handle (100), and a switch button (102) is provided at the middle position of the back of the handle (100).

4. A handheld drilling machine for use in confined spaces according to claim 1, characterized in that, The handle (100) has multiple hand grip grooves (103) on the side facing the drill bit (300) that fit the fingers.

5. A handheld drilling machine for use in confined spaces according to claim 1, characterized in that, The outer strip shell (201) is provided with a first fixing block (209) near the inner end of the handle (100), and the inner insert strip shell (202) is provided with a second fixing block (210) near the inner end of the drill bit (300). The first fixing block (209) and the second fixing block (210) are both provided with bearings (211) located on the same straight line. The two ends of the telescopic transmission shaft (500) are respectively rotatably connected to the bearings (211) on the first fixing block (209) and the second fixing block (210).

6. A handheld drilling machine for use in confined spaces according to claim 1, characterized in that, The telescopic transmission shaft (500) includes a first shaft (501) and a second shaft (502). The first shaft (501) has a limit insertion hole. The outer surface of the second shaft (502) is provided with a limit strip (505) that matches the limit insertion hole. The end of the first shaft (501) is provided with a first bevel gear (503) that meshes with the conical tooth surface on the rotor (301). The end of the second shaft (502) is provided with a second bevel gear (504) that meshes with the drive bevel gear on the motor shaft of the power motor (400).

7. A handheld drilling machine for use in confined spaces according to claim 1, characterized in that, The telescopic support frame (600) includes two telescopic forks (601) arranged in a cross configuration, parallel to each other. A contact plate (602) is connected to one side of the upper end of each telescopic fork (601), and an upper slider (603) is connected to the other side of the upper end of each telescopic fork (601). An upper slide rail (604) matching the upper slider (603) is provided on the lower surface of the contact plate (602). One side of the lower end of each telescopic fork (601) is rotatably connected to an outer strip shell (201), and a lower slider (605) is connected to the other side of the lower end of each telescopic fork (601). A lower slide rail (606) matching the lower slider (605) is provided on the outer strip shell (201).

8. A handheld drilling machine for use in confined spaces according to claim 7, characterized in that, The manual adjustment assembly (700) includes bearing seats (701) fixed at both ends of the upper surface of the outer strip housing (201), a threaded rod (702) is rotatably connected between the two bearing seats (701), a threaded hole matching the threaded rod (702) is opened on the lower slider (605), and a screw cap (703) is connected to the end of the threaded rod (702) extending out of the handle part (100).

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