A limiting screw for use on a hole opener

Abstract

This utility model provides a limiting screw for a hole saw, belonging to the field of hardware tool technology. It solves the technical problems of inconvenience in using existing locking screws on hole saws. The limiting screw in this application includes a limiting rod, a fixed cylinder, and an adjusting plate; the limiting rod slides through the fixed cylinder along its axis; one end of the limiting rod has a limiting plate; the other end of the limiting rod is fixedly connected to the adjusting plate; a spring is sleeved on the limiting rod, with both ends of the spring acting on the end face of the fixed cylinder and the side of the limiting plate, respectively; a limiting block is located on the side of the limiting plate away from the fixed cylinder. The limiting screw in this application can effectively limit the connecting rod in the hole saw, is easy to use, allows for efficient assembly and adjustment, and has a stable and durable structure.

Description

Technical Field

[0001] This utility model belongs to the field of hardware tool technology, and relates to a hole opener, and more particularly to a limiting screw for a hole opener. Background Technology

[0002] A hole saw is a specialized tool used to cut holes in various materials (such as wood, metal, plastic, tile, glass, concrete, etc.). It is widely used in home renovation, construction, pipe installation, furniture manufacturing, and electrical engineering. Compared to drill bits, hole saws are typically used to create larger diameter holes. A hole saw consists of a cylindrical opening with a wear-resistant cutting edge at one end and a connecting rod at the other end, allowing for convenient and quick hole-making operations. The connecting rod of the hole saw is connected to the electric drill, or the separate connecting rod is connected to the hole-making cylinder. It is fixed by using a limit screw. In traditional hole saws, no adjustment is usually required after installation and fixing. Therefore, the limit screw used is relatively simple and is directly locked by thread. However, there are inconveniences when adjusting the installation position of the connecting rod or disassembling it. Utility Model Content

[0003] This utility model addresses the aforementioned problems in existing technologies by providing a limiting screw for a hole opener. The technical problem this utility model aims to solve is: how to improve the ease of disassembly or adjustment of the connecting rod on the hole opener. The objective of this utility model can be achieved through the following technical solutions: A limiting screw for a hole opener includes a limiting rod, a fixing cylinder, and an adjusting disc; the limiting rod slides through the fixing cylinder along its axis. One end of the limiting rod has a limiting disc; the other end of the limiting rod is fixedly connected to the adjusting disc; A spring is sleeved on the limiting rod, and the two ends of the spring act on the end face of the fixed cylinder and the side face of the limiting plate, respectively. The limiting plate has a limiting block on its side away from the fixed cylinder. The principle is as follows: The limiting screw in this application is used in conjunction with the connecting rod in the hole saw. The connecting rod in the hole saw is a hexagonal steel, and an annular groove is formed on the outer circumferential surface of the connecting rod. A first mounting hole is formed on the hole-opening cylinder of the hole saw, or on the mounting base fixed to the hole-opening cylinder, or on the connecting head of the electric drill. The first mounting hole is used to fix the limiting screw. The fixing sleeve of the limiting screw is fixedly connected to the hole-opening cylinder of the hole saw, or the mounting base, or the connecting head of the electric drill. A second mounting hole is formed on the hole-opening cylinder of the hole saw, or on the mounting base fixed to the hole-opening cylinder, or on the connecting head of the electric drill. The second mounting hole is used to insert the connecting rod. The cross-section of the second mounting hole is regular hexagonal, which is adapted to the connecting rod and is used to limit the circumferential rotation of the connecting rod. The first mounting hole and the second mounting hole are connected. During installation and use, the annular groove on the connecting rod is aligned with the first mounting hole. The adjusting plate is located outside the first mounting hole among the limiting screws installed in the first mounting hole. One end of the limiting rod with the limiting plate passes through the first mounting hole and extends into the second mounting hole. The limiting block on the side of the limiting plate can be embedded in the annular groove on the connecting rod, thereby forming an axial limit on the connecting rod. Furthermore, the spring force causes the limiting block on the limiting plate to press against the bottom of the annular groove on the connecting rod. Combined with the circumferential limit of the connecting rod in the second mounting hole, the connecting rod is finally fixed, forming a stable and reliable connection. When it is necessary to disassemble or adjust the position of the connecting rod, external force is used to pull the adjusting plate outward. The adjusting plate drives the limiting rod to move axially within the fixed cylinder against the spring force, thereby causing the limiting block on the limiting plate to disengage from the annular groove on the connecting rod. This allows the connecting rod to be easily moved axially to be pulled out or its position adjusted. After the connecting rod is adjusted to the correct position, the adjusting plate is released, and the limiting rod returns to its original position under the spring force, causing the limiting block on the limiting plate to re-enter the annular groove on the connecting rod, thus limiting the position of the connecting rod. The above structure is simple and convenient to operate, can be operated with one hand, and has a stable and reliable connection. In the aforementioned limiting screw for the hole opener, the fixing cylinder has a through hole along its central axis, the inner diameter of which is larger than the outer diameter of the limiting rod; the limiting rod passes through the through hole and is fixedly connected to the adjusting disc. By adopting the above technical solution, the limiting rod can slide freely inside the fixed cylinder, which improves the convenience of disassembling or adjusting the connecting rod on the hole opener. In the aforementioned limiting screws used on the hole opener, the limiting rod is a round rod, the limiting disc is a round disc, and the limiting block is a square block, and the limiting rod, the limiting disc, and the limiting block are integrally formed; The end of the limiting rod away from the limiting disc has a threaded section, and the adjusting disc is threadedly connected to the threaded section of the limiting rod through a threaded hole. By adopting the above technical solution, the limiting rod, limiting plate, and limiting block are integrally molded to ensure the integrity and stability of the structure. The limiting rod and the adjusting plate are connected by threads, making the assembly of the two convenient, efficient, and stable. With the setting of the limiting rod, fixing cylinder, adjusting plate, spring, and limiting block, the connecting rod of the hole opener is limited and fixed, which improves the convenience of disassembling or adjusting the connecting rod. In the aforementioned limiting screws used on the hole opener, the outer contour of the adjusting disc is a regular hexagon; The outer circumferential surface of the fixed cylinder has external threads; the side of the fixed cylinder away from the limiting plate has a strip-shaped groove; The adjusting disc has a connecting block on the side near the fixed cylinder that can be embedded in the strip-shaped slot; when the connecting block is embedded in the strip-shaped slot, the rotation of the adjusting disc can drive the fixed cylinder to rotate. By adopting the above technical solution, the fixing cylinder of the limit screw forms a threaded connection with the hole-opening cylinder of the hole opener, the mounting base or the connecting head of the electric drill, which is convenient for assembly and the connection is stable. It is easy for the adjusting plate to drive the fixing cylinder to rotate so as to screw the fixing cylinder into the first mounting hole and fix it on the corresponding part of the hole opener. In the aforementioned limiting screw for the hole opener, the two ends of the strip groove on the fixing cylinder penetrate the outer circumferential surface of the fixing cylinder; the two ends of the connecting block are arc surfaces, and the two sides of the connecting block are limiting planes. By adopting the above technical solution, when the connecting block on the adjusting plate is embedded in the strip groove of the fixed cylinder, the two form a circumferential limit; by rotating the adjusting plate, the fixed cylinder can be rotated, thereby screwing the fixed cylinder into the first mounting hole and fixing it to the opening cylinder of the hole opener, the mounting base or the connecting head of the electric drill. Compared with the prior art, the limiting screw in this utility model has the following advantages: 1. In this application, the limiting screw cooperates with the connecting rod, the limiting block is embedded in the annular groove of the connecting rod, and the spring force makes the limiting block press against the bottom of the annular groove. Combined with the circumferential limiting of the connecting rod itself, the connecting rod can be stably and reliably fixed. 2. In this application, when disassembling or adjusting the position of the connecting rod, the adjusting plate is pulled outward, the limiting block disengages from the annular groove, and the connecting rod can be easily moved axially. The operation is simple and convenient, and can be operated with one hand, which improves the convenience of disassembling or adjusting the connecting rod. 3. In this application, the limit rod and the adjusting plate are connected by threads, which makes assembly convenient and efficient and the connection stable. 4. This application optimizes the limiting connection structure between the adjusting plate and the fixed cylinder. By rotating the adjusting plate, the fixed cylinder can be rotated, thereby screwing the fixed cylinder onto the hole-opening cylinder of the hole opener, the mounting base, or the connector head of the electric drill. The assembly is convenient and efficient, and the connection is stable. Attached Figure Description

[0004] Figure 1 This is a schematic diagram of the hole puncher in use in this application. Figure 2 This is a three-dimensional structural diagram of the connecting rod in the hole punch of this application. Figure 3 This is a three-dimensional structural diagram of the limiting screw in this application. Figure 4 This is a schematic diagram of the first exploded structure of the limit screw in this application. Figure 5 This is a schematic diagram of the second exploded structure of the limit screw in this application. In the picture: 10. Hole opener; 11. Hole opening cylinder; 12. Mounting base; 13. Connecting rod; 131. Annular groove; 20. Electric drill; 30. Limiting rod; 31. Limiting disc; 311. Limiting block; 32. Threaded section; 40. Fixed cylinder; 41. Through hole; 42. External thread; 43. Strip groove; 44. Strip block; 50. Adjusting disc; 51. Threaded hole; 52. Connecting block; 521. Arc surface; 522. Limiting plane; 60. Spring. Detailed Implementation

[0005] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Reference Figure 1 and Figure 2 As shown, the limiting screw in this embodiment is used in the hole saw 10, especially in conjunction with the connecting rod 13 in the hole saw 10. The connecting rod 13 in the hole saw 10 is a hexagonal steel, and an annular groove 131 is formed on the outer circumferential surface of the connecting rod 13. One end of the connecting rod 13 is used to connect to the connector of the electric drill 20, and the other end is used to connect to the hole-opening cylinder 11 of the hole saw 10. The connecting rod 13 can be directly connected to the hole-opening cylinder 11; or the mounting base 12 can be fixedly connected to the hole-opening cylinder 11 of the hole saw 10, and the connecting rod 13 is indirectly connected to the hole-opening cylinder 11 of the hole saw 10 through the mounting base 12. A first mounting hole is provided radially on the opening cylinder 11, mounting base 12, or connecting head of the electric drill 20 of the hole opener 10 for installing the limiting screw in this application; a second mounting hole is provided axially on the opening cylinder 11, mounting base 12, or connecting head of the electric drill 20 of the hole opener 10 for slidingly inserting the connecting rod 13. Reference Figure 1 and Figure 2As shown in the illustration, this application takes the example of fixing a mounting base 12 to the opening cylinder 11 of the hole opener 10. The mounting base 12 is fixed to the end of the opening cylinder 11 away from the cutting edge by means of threaded connection or welding. The mounting base 12 is also cylindrical, and the mounting base 12 and the opening cylinder 11 are coaxially arranged. The first mounting hole is opened on the outer peripheral surface of the mounting base 12, and the inner wall of the first mounting hole is provided with internal thread. The second mounting hole passes through both ends of the mounting base 12 along the central axis. The cross-section of the second mounting hole is regular hexagonal, which is adapted to the connecting rod 13 and is used to restrict the circumferential rotation of the connecting rod 13. There is at least one annular groove 131 opened on the outer peripheral surface of the connecting rod 13, for example, there can be two, three, four or five, and the multiple annular grooves 131 are distributed at intervals along the length direction of the connecting rod 13. In this embodiment, the first mounting hole and the second mounting hole are connected. When installed and used, the annular groove 131 on the connecting rod 13 is directly opposite the first mounting hole. Reference Figure 3 , Figure 4 and Figure 5 As shown, the limiting screw used on the hole opener 10 in this application includes a limiting rod 30, a fixed cylinder 40, and an adjusting plate 50. The limiting rod 30 slides through the fixed cylinder 40 along its axis. One end of the limiting rod 30 has a limiting plate 31, and the other end is fixedly connected to the adjusting plate 50. A spring 60 is sleeved on the limiting rod 30, and the two ends of the spring 60 act on the end face of the fixed cylinder 40 and the side of the limiting plate 31, respectively. The side of the limiting plate 31 away from the fixed cylinder 40 has a limiting block 311. Specifically, refer to Figure 4 and Figure 5 As shown, the limiting rod 30 has a round rod body, which is generally made of metal, such as stainless steel, which has good strength and wear resistance; of course, high-strength aluminum alloy can also be used to reduce weight. The surface of the rod body is smoothed to reduce friction with the fixed cylinder 40, facilitating its sliding within the fixed cylinder 40. One end of the rod body is integrally formed with the limiting plate 31. This integral structure makes the connection more stable and can better transmit force. The adjusting disc 50 has a through threaded hole 51 in its center, and one end of the limiting rod 30 has a threaded section 32. The threaded section 32 is located at the end of the limiting rod 30 furthest from the limiting disc 31, and is used to form a threaded connection with the adjusting disc 50. The thread of the threaded section 32 has high precision to ensure a tight fit with the threaded hole 51 of the adjusting disc 50 and prevent loosening. The adjusting disc 50 can be connected to the threaded section 32 in different ways; for example, a fine-pitch thread can be used for a tighter connection; or thread-locking adhesive can be applied to the threads to further enhance the stability of the connection. Reference Figure 3 , Figure 4 and Figure 5As shown, the fixed cylinder 40 is a hollow cylinder, typically made of metal such as carbon steel or stainless steel, possessing sufficient strength to support the limiting rod 30 and withstand external forces. The outer circumferential surface of the fixed cylinder 40 has external threads 42 for engaging with the internal threads in the first mounting hole. The middle of the fixed cylinder 40 has through holes 41 extending through both ends along its central axis. The inner diameter of the through holes 41 is larger than the outer diameter of the limiting rod 30, allowing the limiting rod 30 to slide smoothly through the through holes 41. The inner wall of the cylinder is polished to ensure smooth sliding of the limiting rod 30 within it. The through holes 41 provide sufficient space for the sliding of the limiting rod 30. The smooth inner wall of the through holes 41 reduces friction between the limiting rod 30 and the through holes 41, improving operational smoothness. A strip-shaped groove 43 is provided at the end of the fixed cylinder 40 away from the limiting plate 31. Both ends of the strip-shaped groove 43 penetrate the outer peripheral surface of the fixed cylinder 40. That is, there are two parallel and spaced strip-shaped blocks 44 on the end face of the fixed cylinder 40 away from the limiting plate 31. The two strip-shaped blocks 44 are integrally formed with the fixed cylinder 40, and the strip-shaped groove 43 is formed between the two strip-shaped blocks 44. The strip-shaped groove 43 can be formed by milling. Reference Figure 3 , Figure 4 and Figure 5 As shown, the outer contour of the adjusting disc 50 is a regular hexagon. This shape facilitates rotation using tools, such as a wrench. The disc body can be made of the same material as the limiting rod 30, or it can be made of plastic to reduce cost and weight. The threaded hole 51 of the adjusting disc 50 is located at the center of the disc body and is used for threaded connection with the threaded section 32 of the limiting rod 30. The thread of the threaded hole 51 matches the threaded section 32 of the limiting rod 30 to ensure reliable connection. A connecting block 52 is fixedly provided in the middle of the side of the adjusting disc 50 facing the fixed cylinder 40; the threaded hole 51 also passes through the connecting block 52; the two ends of the connecting block 52 are arc surfaces 521, and the two sides are limiting planes 522. The size of the connecting block 52 is adapted to the strip groove 43 of the fixed cylinder 40 to ensure that the connecting block 52 can be tightly embedded therein. When the connecting block 52 is embedded in the strip groove 43, the rotation of the adjusting disc 50 can drive the fixed cylinder 40 to rotate. The design of the connecting block 52 creates a circumferential limit between the adjusting plate 50 and the fixed cylinder 40, which facilitates the installation and disassembly of the fixed cylinder 40. Reference Figure 3 , Figure 4 and Figure 5As shown, in this embodiment, the limiting disc 31 is a disc, integrally formed with the limiting rod 30, and made of the same material as the limiting rod 30. The side of the limiting disc 31 contacts one end of the spring 60, providing support and force transmission for the spring 60. The diameter of the limiting disc 31 is larger than that of the limiting rod 30, typically several times larger, to ensure that the spring 60 can be stably fitted onto the limiting rod 30. The limiting block 311 is a cube, located on the side of the limiting disc 31 away from the fixed cylinder 40, and integrally formed with the limiting disc 31. The function of the limiting block 311 is to cooperate with the annular groove 131 on the connecting rod 13 of the hole opener 10 to achieve axial limiting of the connecting rod 13. The dimensions of the limiting block 311 are designed according to the dimensions of the annular groove 131 to ensure a tight fit within it. In this embodiment, the spring 60 is a compression spring, generally made of stainless steel or carbon steel, with a suitable elastic coefficient. The spring 60 is sleeved on the limiting rod 30, with its two ends acting on the end face of the fixed cylinder 40 and the side face of the limiting plate 31, respectively. The function of the spring 60 is to provide elastic force so that the limiting block 311 on the limiting plate 31 is always pressed against the annular groove 131 of the connecting rod 13, ensuring the reliability of the limiting. The implementation principle of this embodiment is as follows: Among the limiting screws installed in the first mounting hole, the adjusting plate 50 is located outside the first mounting hole. The end of the limiting rod 30 with the limiting plate 31 passes through the first mounting hole and extends into the second mounting hole. The limiting block 311 on the side of the limiting plate 31 can be embedded in the annular groove 131 on the connecting rod 13, thereby forming an axial limit on the connecting rod 13. Furthermore, the elastic force of the spring 60 causes the limiting block 311 on the limiting plate 31 to press against the bottom of the annular groove 131 on the connecting rod 13. In addition, the connecting rod 13 is circumferentially limited in the second mounting hole, thus finally fixing the connecting rod 13 and forming a stable and reliable connection. When it is necessary to disassemble or adjust the position of the connecting rod 13, the adjusting plate 50 is pulled outward by external force. The adjusting plate 50 drives the limiting rod 30 to move axially within the fixed cylinder 40 against the elastic force of the spring 60, thereby causing the limiting block 311 on the limiting plate 31 to disengage from the annular groove 131 on the connecting rod 13. In this way, the connecting rod 13 can be easily moved axially to pull it out or adjust its position. After the connecting rod 13 is adjusted to the correct position, the adjusting plate 50 is released, and the limiting rod 30 is reset under the elastic force of the spring 60, so that the limiting block 311 on the limiting plate 31 is re-embedded in the annular groove 131 on the connecting rod 13 to limit the position of the connecting rod 13. Compared with the traditional threaded locking method, the structural design in this application is more convenient to operate, greatly improves work efficiency, and solves the problem of inconvenient disassembly or adjustment of the connecting rod 13 in the prior art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A limiting screw for use on a hole opener, characterized in that, The limiting screw includes a limiting rod (30), a fixing cylinder (40), and an adjusting plate (50); the limiting rod (30) slides through the fixing cylinder (40) along the axis of the fixing cylinder (40); One end of the limiting rod (30) has a limiting disc (31); the other end of the limiting rod (30) is fixedly connected to the adjusting disc (50); A spring (60) is sleeved on the limiting rod (30), and the two ends of the spring (60) act on the end face of the fixed cylinder (40) and the side face of the limiting plate (31), respectively. The limiting plate (31) has a limiting block (311) on the side away from the fixed cylinder (40).

2. The limiting screw for a hole opener according to claim 1, characterized in that, The fixed cylinder (40) has a through hole (41) along its central axis, the inner diameter of the through hole (41) being larger than the outer diameter of the limiting rod (30); the limiting rod (30) passes through the through hole (41) and is fixedly connected to the adjusting plate (50).

3. The limiting screw for a hole opener according to claim 2, characterized in that, The limiting rod (30) is a round rod, the limiting disk (31) is a round disk, and the limiting block (311) is a square block. The limiting rod (30), the limiting disk (31), and the limiting block (311) are integrally formed. The end of the limiting rod (30) away from the limiting disk (31) has a threaded section (32), and the adjusting disk (50) is threadedly connected to the threaded section (32) of the limiting rod (30) through a threaded hole (51).

4. The limiting screw for a hole opener according to claim 2 or 3, characterized in that, The outer contour of the adjustment disk (50) is a regular hexagon; The outer peripheral surface of the fixed cylinder (40) has an external thread (42); the side of the fixed cylinder (40) away from the limiting plate (31) has a strip groove (43); The adjusting disc (50) has a connecting block (52) on the side near the fixed cylinder (40) that can be embedded in the strip slot (43); when the connecting block (52) is embedded in the strip slot (43), the rotation of the adjusting disc (50) can drive the fixed cylinder (40) to rotate.

5. The limiting screw for a hole opener according to claim 4, characterized in that, The two ends of the strip groove (43) on the fixed cylinder (40) penetrate the outer circumferential surface of the fixed cylinder (40); the two ends of the connecting block (52) are arc surfaces (521), and the two sides of the connecting block (52) are limiting planes (522).

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