A drill bit mechanism for decorative installation

Abstract

This utility model belongs to the technical field of drill bit mechanisms, specifically relating to a drill bit mechanism for decorative installation. It includes a handheld electric drill mechanism comprising a drill body, a base for placement when not in use, and a drive shaft. The base is fixedly mounted on the handle end of the drill body, and the end of the drill body is provided with a drive shaft for rotational operation. The drill bit mechanism includes a shaft seat, a threaded hole, a through hole, a threaded knob, a torsion knob, and a threaded cap. The shaft seat and the end of the drive shaft are slidably sleeved together. The surface of the shaft seat has symmetrical through threaded holes. This solution, by providing a detachable shaft seat and mounting head at the front end of the drill body, allows the operator to quickly change drill rods of different specifications according to specific task requirements. The mounting head uses a rectangular groove structure inside, precisely aligning with the rectangular end of the drill rod, ensuring automatic positioning during insertion and preventing misalignment.

Description

Technical Field

[0001] This utility model belongs to the technical field of drill bit mechanisms, specifically relating to a drill bit mechanism for decorative installation. Background Technology

[0002] In recent years, in architectural decoration and interior installation projects, whether it is the decoration and construction of residential homes, commercial spaces or public facilities, precise drilling operations are required to reliably connect various decorative components, such as picture hanging tracks, lamp bases, hardware accessories, and pipeline penetrations, to the building substrate, such as concrete walls, gypsum boards, wooden bases, and metal framing.

[0003] As a functional component that directly contacts the substrate, the performance of the drill bit determines the drilling efficiency and hole wall quality. According to the authorization announcement number CN220515486U, a combined drill bit mechanism electric drill is disclosed, including an electric drill body. The drill bit mounting mechanism that is easy to disassemble and assemble includes a motor installed on one end of the inner wall of the electric drill body. The output end of the motor is fixedly provided with a rotating shaft. One end of the rotating shaft is fixedly provided with a retaining shaft. Multiple anti-slip pads are fixedly provided at equal intervals on the outer wall of the retaining shaft. Four retaining holes are opened at equal intervals on the outer wall of the retaining shaft. Each of the four retaining holes has a buckle inserted through its inner wall. Each of the four retaining holes has a spring fixedly provided on one side of its inner wall. This invention involves attaching a mounting cover with different triangular chucks to the upper end of a chuck shaft. When inserted, the upper end of the cover is secured by the elasticity of a spring, allowing it to be locked into the inner wall of the mounting cover. When replacing, it can be pulled out by force, causing the chuck to compress the spring and disengage. Furthermore, the anti-slip pads prevent the mounting cover from easily falling off during installation, allowing a single electric drill to be fitted with different types of drill bits, thereby improving the ease of use of the device.

[0004] Currently, most drill bits are installed directly onto the end of the drill spindle during installation. This results in frequent replacement of the drill bit when creating holes or grooves of varying sizes. Furthermore, when operating a handheld drill for extended periods, hand vibrations can easily occur, leading to errors in the size and regularity of the holes or grooves. Utility Model Content

[0005] The purpose of this utility model is to provide a drill bit mechanism for decorative installation, which aims to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a drill bit mechanism for decorative installation, comprising, A handheld electric drill mechanism includes an electric drill body, a base for placing the drill when not in use, and a drive shaft. The base is fixedly mounted on the handle end of the electric drill body, and a drive shaft for rotating the drill body is provided at the end of the electric drill body. A drill bit mechanism includes a bearing, a threaded hole, a through hole, a threaded knob, a torsion knob, and a threaded cap. The bearing is slidably sleeved with the end of the shaft core. The surface of the bearing has symmetrical through threaded holes. The area of ​​the shaft core corresponding to the position of the threaded hole has a through hole. The same threaded knob is installed through the interior of both the threaded holes and the through hole distributed at both ends. A torsion knob is welded to one end of the threaded knob. A threaded cap is threadedly installed at the end of the threaded knob away from the torsion knob. The end face of the threaded cap is tightly abutted against the outer ring wall of the bearing.

[0007] As a preferred embodiment of this utility model, the end of the bearing seat away from the shaft core is welded and fixed with an installation head, and the installation head has an internal groove, which is a rectangular groove.

[0008] As a preferred embodiment of this utility model, the mounting head is provided with a drill rod, and one end of the drill rod is provided with an integrally formed end head, the surface of which slides and engages with the interior of the built-in groove.

[0009] As a preferred embodiment of this utility model, a threaded sleeve is fixedly fixed through the surface of the mounting head, the threaded sleeve is connected to the built-in groove, and a threaded groove is opened through the end surface, the position of the threaded groove corresponding to the position of the threaded sleeve.

[0010] As a preferred embodiment of this utility model, the internal thread of the threaded sleeve is fitted with a threaded knob II, and a plurality of twisting knobs II are fixedly distributed at one end of the threaded knob II, which are respectively fixedly connected to the internal thread of the threaded sleeve and the inner wall thread of the threaded groove.

[0011] As a preferred embodiment of this utility model, the mounting head is fixedly provided with annular cutter heads on the side near the drill rod, and the ends of the annular cutter heads are provided with annularly distributed toothed cutting edges.

[0012] As a preferred embodiment of this utility model, the electric drill body is further provided with a limiting and advancing mechanism for drilling and advancing assistance. The limiting and advancing mechanism includes a connecting plate, a connecting rod, a square sleeve, a square rod, an anti-detachment plate, a support frame, a crescent head, and a spring. The connecting plate is attached to the surface of the electric drill body. A connecting rod is fixedly installed at the middle of the outward end of the connecting plate. A square sleeve is fixedly installed at the end of the connecting rod away from the electric drill body. A square rod that provides travel movement is slidably sleeved inside the square sleeve. An anti-detachment plate is fixedly installed at one end of the square rod. A support frame is assembled at the end of the square rod near the drill rod. A crescent head for fitting the material to be drilled and through which the drill rod passes is provided at one end of the support frame. A spring is wound around the surface of the square rod. The two ends of the spring are fixedly installed to the surface of the support frame and the end face of the square sleeve, respectively.

[0013] As a preferred embodiment of this utility model, both sides of the connecting plate are fixedly fitted with an inner sleeve, and the surface of the electric drill body is fixedly installed with a threaded post corresponding to the position of the inner sleeve. The surface of the threaded post is slidably fitted with the inner sleeve at the corresponding position, and a threaded cap is threadedly installed at the end of the threaded post. One end of the threaded cap is tightly fitted with the end face of the inner sleeve.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This solution features a detachable bearing and mounting head at the front end of the electric drill body. Operators can quickly change drill rods of different specifications according to specific task requirements. The mounting head has a rectangular groove structure inside, which precisely aligns with the rectangular end of the drill rod, ensuring automatic positioning during insertion and preventing misalignment. Subsequently, the drill rod is securely locked by a threaded knob. This not only simplifies the replacement process but also significantly improves the rigidity of the connection, keeping the drill bit stable during high-speed rotation, reducing vibration, thereby extending tool life and improving drilling accuracy. 2. This solution, in conjunction with the drill rod, adds a ring-shaped cutter head design, expanding the working range of a single tool. The ring-shaped cutter head is fixed to the side of the mounting head, and its edge is distributed with continuous toothed cutting edges, which can cut or groove thin plates while the drill rod is performing drilling tasks. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram showing the distribution of the various mechanisms of this utility model; Figure 2 This is a schematic diagram of the overall front structure of this utility model; Figure 3 This is a schematic diagram of the overall side structure of this utility model; Figure 4 This is a partially enlarged schematic diagram of the bearing seat and mounting head of this utility model; Figure 5 For the present utility model Figure 3 Enlarged view of point A; Figure 6 This is a front view of the disassembled connection of the drill rod, mounting head, shaft seat, and shaft core of this utility model; Figure 7 This is a side view of the disassembled connection of the drill rod, mounting head, shaft seat, and shaft core of this utility model.

[0016] In the diagram: 1. Handheld electric drill mechanism; 10. Electric drill body; 11. Base; 12. Spindle; 2. Drill bit mechanism; 20. Shaft seat; 21. Threaded hole one; 22. Through hole; 23. Threaded knob one; 24. Twist knob one; 25. Threaded cap one; 201. Mounting head; 202. Internal groove; 203. End; 204. Drill rod; 205. Threaded sleeve; 206. Threaded groove; 207. Threaded knob two; 208. Twist knob two; 209. Ring cutter head; 3. Limiting forward mechanism; 30. Connecting plate; 31. Connecting rod; 32. Square sleeve; 33. Square rod; 34. Anti-detachment plate; 35. Support frame; 36. Crescent head; 37. Spring; 301. Internal sleeve; 302. Threaded column; 303. Threaded cap II. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0020] Example 1 Reference Figures 1-7 This is the first embodiment of the present invention, which provides a drill bit mechanism for decorative installation, comprising: The handheld electric drill mechanism 1 includes an electric drill body 10, a base 11 for placement when not in use, and a drive shaft 12. The base 11 is fixedly installed at the handle end of the electric drill body 10, and the drive shaft 12 for rotation operation is provided at the end of the electric drill body 10. The electric drill body 10 is a handheld universal model. The base 11 is the power supply base of the electric drill body 10 and has a stable horizontal placement effect. The drive shaft 12 is the rotating shaft structure of the motor output inside the electric drill body 10, which can be used to drive the drill rod 204 to rotate continuously. Drill bit mechanism 2 includes a bearing 20, a threaded hole 21, a through hole 22, a threaded knob 23, a torsion knob 24, and a threaded cap 25. The bearing 20 is slidably sleeved with the end of the shaft core 12. The surface of the bearing 20 has symmetrical through threaded holes 21. The area of ​​the shaft core 12 corresponding to the position of the threaded hole 21 has a through hole 22. The same threaded knob 23 is installed inside both the threaded holes 21 distributed at both ends and the through hole 22. A torsion knob 24 is welded to one end of the threaded knob 23. 3. A threaded cap 25 is threadedly installed at the end away from the twist knob 24. The end face of the threaded cap 25 is tightly fitted against the outer ring wall of the shaft seat 20. When the mounting head 201 needs to be installed with the shaft core 12 through the shaft seat 20, the shaft seat 20 and the shaft core 12 are fitted together, and the threaded hole 21 and the through hole 22 are aligned. The threaded knob 23 passes through the threaded hole 21 and the through hole 22 to fix the shaft seat 20 and the shaft core 12. Then, the end thread of the threaded cap 25 and the threaded knob 23 is installed to lock and fix the shaft seat 20 and the shaft core 12.

[0021] The end of the bearing seat 20 away from the shaft core 12 is welded and fixed with an installation head 201. The installation head 201 has an internal groove 202, which is a rectangular groove. The installation head 201 can serve as a transition connection, and the internal groove 202 facilitates the installation of the drill rod 204.

[0022] The mounting head 201 is equipped with a drill rod 204, and one end of the drill rod 204 is equipped with an integrally formed end head 203. The surface of the end head 203 slides and inserts into the interior of the built-in groove 202. Since both the end head 203 and the built-in groove 202 are rectangular structures, the shape limiter enables the drill rod 204 to be quickly inserted and positioned when it is connected to the mounting head 201.

[0023] The mounting head 201 has a threaded sleeve 205 fixed through its surface. The threaded sleeve 205 is connected to the built-in groove 202. The end head 203 has a threaded groove 206 that penetrates its interior. The position of the threaded groove 206 corresponds to the position of the threaded sleeve 205. After the drill rod 204 is connected to the mounting head 201, the threaded groove 206 can be matched with the threaded sleeve 205.

[0024] The threaded sleeve 205 has a threaded knob 207 installed on its internal thread. Several torsion knobs 208 are fixedly distributed on one end of the threaded knob 207. The threaded knobs 207 are fixedly connected to the internal thread of the threaded sleeve 205 and the inner wall thread of the threaded groove 206. By assembling the threaded knobs 207 with the threaded sleeve 205 and the threaded groove 206 respectively, the drill rod 204 can be stably connected.

[0025] Among them, the mounting head 201 is fixed with annular cutter heads 209 on one side near the drill rod 204. The end of the annular cutter head 209 is provided with annularly distributed toothed cutting edges. The annular cutter head 209 can provide operation for thin plates or grooving, and together with the drill rod 204, it can improve the applicability of a single drill bit mechanism 2.

[0026] The drill body 10 is also equipped with a limiting and advancing mechanism 3 for drilling and advancing assistance. The limiting and advancing mechanism 3 includes a connecting plate 30, a connecting rod 31, a square sleeve 32, a square rod 33, an anti-detachment plate 34, a support frame 35, a crescent head 36, and a spring 37. The connecting plate 30 is attached to the surface of the drill body 10. The connecting rod 31 is fixedly installed at the middle of the outward end of the connecting plate 30. The square sleeve 32 is fixedly installed at the end of the connecting rod 31 away from the drill body 10. The square rod 33, which provides travel movement, is slidably sleeved inside the square sleeve 32. The anti-detachment plate 34 is fixedly installed at one end of the square rod 33. The support frame 35 is assembled at the end of the square rod 33 near the drill rod 204. The crescent head 36, which is used to fit the material to be drilled and through which the drill rod 204 passes, is provided at one end of the support frame 35. The surface of the square rod 33 is wound with a spring 37. The two ends of the spring 37 are respectively attached to the surface of the support frame 35 and the square rod 36. The end face of the square sleeve 32 is fixedly installed. When auxiliary drilling is required, the hand grips the drill body 10, so that the support frame 35 fits against the material surface, and the drilling or grooving area corresponding to the crescent head 36 is aligned. By pushing the drill body 10, the drill rod 204 can move forward and gradually adjust its position so that the drill rod 204 corresponds to the drilling or grooving point. Then, the power of the drill body 10 is turned on, so that the spindle 12 can rotate through the component transmission. By continuously pushing the drill body 10, the square sleeve 32 slides horizontally on the surface of the square rod 33. By continuously compressing the spring 37, the pushing process has a stable horizontal and slow pushing effect. The anti-slip plate 34 prevents the square sleeve 32 from slipping off the square rod 33. After gradual pushing, the drill rod 204 can stably perform horizontal drilling or grooving, improving the work quality of handheld drill operation during continuous work.

[0027] The connecting plate 30 has an inner sleeve 301 fixed through both sides. The surface of the drill body 10 is fixedly installed with a threaded post 302 corresponding to the position of the inner sleeve 301. The surface of the threaded post 302 is slidably sleeved with the inner sleeve 301 at the corresponding position. The end of the threaded post 302 is threadedly installed with a threaded cap 303. One end of the threaded cap 303 is tightly attached to the end face of the inner sleeve 301. When it is necessary to separate and store the drill body 10 from the limiting forward mechanism 3, the threaded cap 303 is rotated to separate it from the threaded post 302, which can realize the disengagement operation between the connecting plate 30 and the drill body 10.

[0028] In practical implementation: The handheld electric drill mechanism 1 of this scheme serves as the power source for the entire system. Its drill body 10 has a built-in motor that outputs rotational power through the shaft core 12. The end of the shaft core 12 slides into the bearing seat 20 in the drill bit mechanism 2, achieving initial connection for power transmission. The surface of the bearing seat 20 has symmetrical threaded holes 21, corresponding to the through holes 22 on the shaft core 12. During installation, the threaded knob 23 is inserted sequentially into the threaded holes 21 and 22, and locked at one end with a threaded cap 25, firmly fixing the bearing seat 20 to the shaft core 12. Twisting the knob 24 facilitates manual tightening, ensuring transmission. During the process, no loosening occurs. The mounting head 201 is welded to the end of the shaft seat 20 as a transition component. Its built-in groove 202 is a rectangular structure used to accommodate the end 203 of one end of the drill rod 204. The end 203 fits the shape of the built-in groove 202 to achieve quick insertion and positioning. Furthermore, the threaded sleeve 205 is aligned with the threaded groove 206 on the end 203, and the threaded knob 207 passes through the threaded sleeve 205 and is screwed into the threaded groove 206. Twisting the knob 208 provides convenient operation, and finally a stable connection between the drill rod 204 and the mounting head 201 is achieved, ensuring that the drill rod 204 does not shift or fall off at high speed. The drill bit mechanism 2 not only has ordinary drilling function, but also integrates grooving capability, expanding its application range. The drill rod 204, as the main working component, rotates at high speed under the drive of the electric drill body 10 to realize drilling operations on various materials. The annular cutter head 209 at the front end of the mounting head 201 is designed with annular toothed cutting edge. When it contacts thin plates or surfaces that need grooving, it can perform annular cutting or grooving. The annular cutter head 209 works in conjunction with the drill rod 204 to complete edge trimming or shallow grooving while drilling. It is suitable for occasions with high precision and surface quality requirements in decoration and installation. The rectangular fit between the end head 203 and the built-in groove 202 prevents the drill rod 204 from slipping during rotation, ensuring transmission efficiency. The locking mechanism of the threaded knob 207 and the threaded groove 206 further enhances the stability of the drill rod 204 and prevents it from loosening in a vibration environment. The entire drill bit mechanism 2, through modular design, realizes quick replacement of the drill rod 204 and adapts to different operation requirements, improving work efficiency and reducing tool replacement frequency. The limiting forward mechanism 3 is used to provide stable propulsion assistance during drilling or grooving, ensuring operational accuracy and safety. This mechanism is connected to the drill body 10 via a connecting plate 30. The built-in sleeves 301 on both sides of the connecting plate 30 are fitted onto the threaded posts 302 on the surface of the drill body 10 and locked with threaded caps 303, enabling detachable installation. The connecting rod 31 connects the connecting plate 30 to the square sleeve 32. The square sleeve 32 slides inside a square rod 33. One end of the square rod 33 is fixed with an anti-slip plate 34 to prevent slippage, and the other end is connected to a crescent head 36 via a support frame 35. The crescent head 36 fits against the surface of the material being processed and leaves space for the drill rod 204 to pass through. A spring 37 is wound around the square rod 33, and both ends are fixed to the support frame 35 and the end face of the square sleeve 32, respectively. During operation, the drill body 10 is pushed forward by hand, the crescent head 36 is pressed against the surface of the material, the square rod 33 slides inside the square sleeve 32, and the spring 37 is compressed to generate a reverse force, making the propulsion process smooth and slow.

[0029] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0030] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0031] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0032] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A drill point mechanism for decorative mounting, characterized by: include, The handheld electric drill mechanism (1) includes an electric drill body (10), a base (11) for non-working placement, and a drive shaft (12). The base (11) is fixedly installed at the handle end of the electric drill body (10), and the drive shaft (12) for rotating operation is provided at the end of the electric drill body (10). The drill bit mechanism (2) includes a bearing seat (20), a threaded hole (21), a through hole (22), a threaded knob (23), a torsion knob (24), and a threaded cap (25). The bearing seat (20) is slidably sleeved with the end of the shaft core (12). The surface of the bearing seat (20) is provided with a symmetrical through threaded hole (21). The area of ​​the shaft core (12) corresponding to the position of the threaded hole (21) is provided with a through hole (22) that penetrates its interior. The same threaded knob (23) is provided inside the threaded hole (21) distributed at both ends and inside the through hole (22). A torsion knob (24) is welded and fixed to one end of the threaded knob (23). A threaded cap (25) is threadedly installed at the end of the threaded knob (23) away from the torsion knob (24). The end face of the threaded cap (25) is tightly fitted against the outer ring wall of the bearing seat (20).

2. The drill bit mechanism for decorative installation according to claim 1, characterized in that: The end of the bearing seat (20) away from the shaft core (12) is welded and fixed with an installation head (201). The installation head (201) has an internal groove (202) which is a rectangular groove.

3. The drill bit mechanism for decorative installation according to claim 2, characterized in that: The mounting head (201) is provided with a drill rod (204), and one end of the drill rod (204) is provided with an integrally formed end head (203). The surface of the end head (203) slides and inserts into the interior of the built-in groove (202).

4. The drill bit mechanism for decorative installation according to claim 3, characterized in that: The surface of the mounting head (201) is fixed with a threaded sleeve (205), which is connected to the built-in groove (202). The surface of the end (203) is provided with a threaded groove (206) that penetrates its interior, and the position of the threaded groove (206) corresponds to the position of the threaded sleeve (205).

5. A drill bit mechanism for decorative installation according to claim 4, characterized in that: The threaded sleeve (205) has a threaded knob (207) installed on its internal thread. Several twisting knobs (208) are fixedly distributed on one end of the threaded knob (207). The threaded knobs (207) are fixedly connected to the internal thread of the threaded sleeve (205) and the inner wall thread of the threaded groove (206).

6. A drill bit mechanism for decorative installation according to claim 5, characterized in that: The mounting head (201) has an annular cutter head (209) fixed on one side near the drill rod (204), and the end of the annular cutter head (209) is provided with annularly distributed toothed cutting edges.

7. A drill bit mechanism for decorative installation according to claim 6, characterized in that: The drill body (10) is also provided with a limiting forward mechanism (3) for drilling and advancing assistance. The limiting forward mechanism (3) includes a connecting plate (30), a connecting rod (31), a square sleeve (32), a square rod (33), an anti-detachment plate (34), a support frame (35), a crescent head (36), and a spring (37). The connecting plate (30) is attached to the surface of the drill body (10). The connecting rod (31) is fixedly installed at the middle position of the outward end of the connecting plate (30). The square sleeve (32) is fixedly installed at the end of the connecting rod (31) away from the drill body (10). The square sleeve (32) has a square rod (33) that provides travel movement inside. One end of the square rod (33) is fixedly installed with an anti-detachment plate (34). A support frame (35) is installed at the end of the square rod (33) near the drill rod (204). One end of the support frame (35) is provided with a crescent head (36) for fitting the material to be drilled and through which the drill rod (204) passes. A spring (37) is wound around the surface of the square rod (33). The two ends of the spring (37) are fixedly installed on the surface of the support frame (35) and the end face of the square sleeve (32), respectively.

8. A drill bit mechanism for decorative installation according to claim 7, characterized in that: Both sides of the connecting plate (30) are fixed with an inner sleeve (301). The surface of the electric drill body (10) is fixedly installed with a threaded post (302) corresponding to the position of the inner sleeve (301). The surface of the threaded post (302) is slidably sleeved with the inner sleeve (301) at the corresponding position. The end of the threaded post (302) is threaded with a threaded cap (303). One end of the threaded cap (303) is tightly attached to the end face of the inner sleeve (301).

Images