Hole opener

Abstract

The utility model discloses a tapper which comprises a positioning drill, a cylindrical cover body and a connecting shaft, the first end of the connecting shaft is provided with a first external thread and a second through hole, the second through hole is formed in the end face of the first end of the connecting shaft, the inner wall of the second through hole is provided with a second internal thread, and the second end of the connecting shaft is used for being connected with a driving tool. A first through hole allowing the positioning drill to penetrate through is formed in the position, close to the middle, of the bottom of the cylindrical cover body, a first internal thread is arranged on the inner wall of the first through hole so that the cylindrical cover body can be detachably connected to the connecting shaft, a second external thread is arranged at the first end of the positioning drill, and the second external thread is detachably connected with the second internal thread. A first protrusion is arranged on the side, close to the second external thread and far away from the end head of the first end of the positioning drill, of the positioning drill, the diameter of the position, provided with the first protrusion, of the positioning drill is larger than that of the second through hole, the threads between the positioning drill and the connecting shaft do not need to bear too much force due to the arrangement of the first protrusion, and therefore the threaded connection structure is protected.

Description

Technical Field

[0001] The utility model relates to a hole opener, which is applied to the technical field of wall hole opening. Background Art

[0002] The existing hole openers on the market are mainly connected in the following three ways:

[0003] First, the connecting shaft and the positioning drill are made into an integrated structure by welding and other processes. Although the positioning drill connected by welding is very strong, it cannot be disassembled and replaced.

[0004] Secondly, the positioning drill is detachable, and the detachability is achieved by providing relative screw holes on the side walls of the cylindrical cover body, and notches are provided on the opposite sides of one end of the positioning drill. When the positioning drill is installed, the notches correspond to the screw holes, and the screws pass through the screw holes and abut against the notches to lock the positioning drill. The detachable connection of the positioning drill is achieved by the screws. Such a structure fixes the positioning drill. After the positioning drill is subjected to working force, the screws on the connecting shaft are easily loosened after vibration, causing the positioning drill to fall off or slip, which will pose a safety hazard.

[0005] Third, both the connecting shaft and the positioning drill are tapered, and a through hole for disassembly is left at an appropriate position in the middle of the connecting shaft. When the positioning drill is working, the tapered positioning drill will become tighter and tighter in the tapered connecting shaft, and finally be stuck in a certain position. During disassembly, a wedge round steel is inserted into the through hole on the connecting shaft, and the positioning drill is loosened by hitting the wedge round steel. Although such a positioning drill works very stably, due to this structure, the connection between the positioning drill and the connecting shaft will become tighter and tighter during work, which makes it inconvenient to disassemble the positioning drill and the connecting shaft, making it difficult for users to replace the positioning drill. Summary of the invention

[0006] In view of the above-mentioned prior art hole openers, one is not easy to replace; one is easy to loosen during use, causing it to fall off and forming a safety hazard; and another is difficult to disassemble the positioning drill and the connecting shaft. Overall, these three problems bring inconvenience to users. The utility model provides a hole opener, which is provided with a mounting groove at one end of the connecting shaft, and a first internal thread is provided in the mounting groove, that is, the positioning drill and the connecting shaft are detachably connected through a thread. The positioning drill and the connecting shaft are connected by a threaded structure, which is very easy to install and disassemble. The threaded structure connection is very convenient for replacing the hole opener, and when the hole opener is When the positioning drill is working, it will become tighter and tighter due to the threaded structure of the positioning drill. However, since the positioning drill is provided with a first protrusion on one side of the second external thread, the first protrusion can play a role of locking, and the excess force is transferred to the connecting shaft by the positioning drill, so the positioning drill and the connecting shaft will not be stuck, and it is also convenient to disassemble the positioning drill. In addition, the setting of the first protrusion makes it unnecessary for the thread between the positioning drill and the connecting shaft to bear too much force, thereby protecting the threaded connection structure. The cylindrical cover body and the connecting shaft can also be detachably connected by threads, which makes it convenient for users to disassemble and replace cylindrical covers of different sizes.

[0007] The technical solution adopted by the utility model to solve its technical problems is: a hole opener, the hole opener includes a positioning drill, a cylindrical cover and a connecting shaft, the first end of the connecting shaft is provided with a first external thread and a second through hole, and the second through hole is arranged on the end face of the first end of the connecting shaft, the inner wall of the second through hole is provided with a second internal thread, the second end of the connecting shaft is used to connect with a driving tool, the bottom of the cylindrical cover is provided with a first through hole for the positioning drill to pass through near the middle position, the inner wall of the first through hole is provided with a first internal thread, the first internal thread and the first external thread are detachably connected so that the cylindrical cover can be detachably connected to the connecting shaft, the first end of the positioning drill is provided with a second external thread, the second external thread and the second internal thread are detachably connected, a first protrusion is provided on the side of the positioning drill close to the second external thread and away from the first end of the positioning drill, and the diameter of the position where the first protrusion is provided on the positioning drill is larger than the diameter of the second through hole.

[0008] Furthermore, a second protrusion is provided on a side of the connecting shaft close to the first external thread and away from the first end of the connecting shaft, and the diameter of the connecting shaft at a position where the second protrusion is provided is greater than the diameter of the first through hole.

[0009] Furthermore, a boss is provided at the bottom of the cylindrical cover body, the boss is arranged in the direction of the connecting shaft, the first through hole is arranged on the boss, and the first through hole is connected to the inside of the cylindrical cover body, and the first internal thread covers the inner wall of the first through hole.

[0010] Furthermore, the boss is trapezoidal, and the diameter of the boss at one end away from the cylindrical cover body is smaller than the diameter of the boss at one end connected to the cylindrical cover body.

[0011] Furthermore, teeth are arranged around the opening of the cylindrical cover body, a cutter is arranged at the top of the teeth, and the right end of the cutter is arranged higher than the left end of the cutter.

[0012] Furthermore, the right end of the cutter forms an angle of 3°-6° with the left end of the cutter.

[0013] Furthermore, the end of the second end of the positioning drill is provided with four blades, the second end of the positioning drill is opposite to the first end of the positioning drill, the four blades are arranged in a cross shape, and the top ends of the four blades are connected to form a conical cutter head, and the cutter head is integrally formed with the positioning drill.

[0014] Furthermore, a left cut surface and a right cut surface are provided at the top of the blade, the left cut surface is connected to the right cut surface and forms a cone, and the length of the left cut surface extending in the cut surface direction is greater than the length of the right cut surface extending in the cut surface direction.

[0015] Furthermore, one end of the blade is connected to the side wall of the positioning drill so that the diameter of the cutter head is larger than the diameter of the positioning drill.

[0016] Furthermore, at least one discharge hole is provided on the side wall of the cylindrical cover.

[0017] The beneficial effects of the utility model: the utility model provides a hole opener, by arranging a mounting groove at one end of the connecting shaft, a first internal thread is arranged in the mounting groove, that is, the positioning drill and the connecting shaft are detachably connected through the thread, then the positioning drill and the connecting shaft are connected by a threaded structure, which is very easy to install and disassemble, and the threaded structure connection is very convenient when replacing the hole opener, and when the hole opener acts on the positioning drill, the positioning drill will become tighter and tighter due to the threaded structure, but since the positioning drill is provided with a protrusion on one side of the second external thread, the protrusion can play a role of blocking, and the excess force is transferred to the connecting shaft by the positioning drill, so the positioning drill and the connecting shaft are connected. The connecting shaft will not get stuck, and it is also convenient to disassemble the positioning drill. The setting of the protrusion ensures that the thread between the positioning drill and the connecting shaft does not need to bear too much force, thereby protecting the threaded connection structure. The cylindrical cover body and the connecting shaft can also be detachably connected by threads, which makes it convenient for users to disassemble and replace cylindrical covers of different sizes. A second protrusion is provided on the side of the connecting shaft close to the first external thread and away from the first end of the connecting shaft. The second protrusion can play a role of locking, and the excess force is transferred to the connecting shaft by the cylindrical cover body. The setting of the second protrusion ensures that the thread between the cylindrical cover body and the connecting shaft does not need to bear too much force, thereby protecting the threaded connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the hole opener provided by the utility model;

[0019] Figure 2 It is a schematic diagram of the exploded structure of the hole opener provided by the utility model;

[0020] Figure 3 It is a schematic diagram of the exploded structure of the hole opener provided by the utility model;

[0021] Figure 4 It is a schematic diagram of the exploded structure of the hole opener provided by the utility model;

[0022] Figure 5 It is a three-dimensional diagram of the hole opener provided by the utility model;

[0023] Figure 6 It is an enlarged view of A provided by the utility model.

[0024] Figure numerals: positioning drill 1; second external thread 11; cutter head 12; blade 121; left cut surface 1211; right cut surface 1212; first protrusion 13; cylindrical cover 2; first through hole 21; first internal thread 211; boss 22; teeth 23; cutter 231; discharge hole 24; first internal thread 211; connecting shaft 3; first external thread 31; second through hole 32; second internal thread 321; second protrusion 33. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] See also Figure 1-6 The utility model provides a hole opener, such as Figure 1-4As shown, the hole opener includes a positioning drill 1, a cylindrical cover body 2 and a connecting shaft 3. The cylindrical cover body 2 can be set to different diameters, so that the user can replace the cylindrical cover body 2 according to the required aperture. The first end of the connecting shaft 3 is provided with a first external thread 31 and a second through hole 32, and the second through hole 32 is arranged on the end surface of the first end of the connecting shaft 3, and the inner wall of the second through hole 32 is provided with a second internal thread 321. The second end of the connecting shaft 3 is used to connect with a driving tool. A first through hole 21 for the positioning drill 1 to pass through is provided near the middle position of the bottom of the cylindrical cover body 2, and a first internal thread 211 is provided on the inner wall of the first through hole 21. The first internal thread 211 is detachably connected with the first external thread 31, so that the cylindrical cover body 2 can be detachably connected to the connecting shaft 3. The first end of the positioning drill 1 is provided with a second external thread 11, and the second external thread 11 is detachably connected with the second internal thread 321. A first protrusion 13 is provided on the side of the positioning drill 1 close to the second external thread 11 and away from the first end of the positioning drill 1. The diameter of the position where the first protrusion 13 is located is greater than the diameter of the second through hole 32, and the length of the positioning drill 1 is greater than the length of the cylindrical cover body 2. When the positioning drill 1 and the cylindrical cover body 2 are connected to the connecting shaft 3 at the same time, a hole opener is formed; that is, the positioning drill and the connecting shaft are connected by a threaded structure, which is very easy to install and disassemble. The threaded structure connection is very convenient for replacing the hole opener, and when the hole opener acts on the positioning drill, the positioning drill will become tighter and tighter due to the threaded structure. However, since the positioning drill is provided with a first protrusion 13 on one side of the second external thread, the first protrusion 13 can play a role of locking, and the excess force is transferred to the connecting shaft by the positioning drill, so the positioning drill and the connecting shaft will not be stuck, and it is also convenient to disassemble the positioning drill. The setting of the first protrusion 13 makes it unnecessary for the thread between the positioning drill and the connecting shaft to bear too much force, thereby protecting the threaded connection structure; the cylindrical cover body and the connecting shaft can also be detachably connected by a thread, which is convenient for users to disassemble and replace cylindrical covers of different sizes.

[0027] like Figure 4 As shown, the setting of the above-mentioned first protrusion 13 can set the thickness and diameter to be slightly wider. The thickness of the first protrusion 13 refers to the setting along the length direction of the positioning drill. The thickness and diameter of the first protrusion 13 are set slightly wider to have a greater bearing capacity. If the thickness of the first protrusion 13 is set too thin, the force on the first protrusion 13 is too large and it is easy to change. The diameter of the first protrusion 13 is set too small, that is, the diameter of the first protrusion 13 is only slightly larger than the diameter of the groove. In the later period, due to excessive wear and force, slipping may occur, which may easily cause safety accidents. Therefore, when setting the first protrusion 13, the diameter of the first protrusion 13 can be slightly larger, but it cannot exceed the diameter of the first through hole to prevent the cylindrical cover from being unable to be installed on the connecting shaft. The thickness of the above-mentioned first protrusion 13 can also be set along the length of the light rod of the positioning drill, which is convenient for demolding, better pressure resistance, and higher stability.

[0028] In this embodiment, Figure 4 As shown, a second protrusion is provided on the side of the connecting shaft 3 close to the first external thread 31 and away from the first end of the connecting shaft 3. The diameter of the position where the second protrusion is provided on the connecting shaft 3 is larger than the diameter of the first through hole 21. Since the cylindrical cover body 2 is provided with a second protrusion 33 on one side of the first external thread 31, the second protrusion 33 can play a role of locking, and the excess force is transferred to the connecting shaft by the cylindrical cover body 2. The setting of the second protrusion 33 makes it unnecessary for the thread between the cylindrical cover body 2 and the connecting shaft to bear too much force, thereby protecting the threaded connection structure. The setting of the second protrusion 33 can set the thickness and diameter slightly wider, and the second protrusion 33 can be used to prevent the thread from being damaged. The thickness of the second protrusion 33 refers to the setting along the length direction of the connecting shaft. The thickness and diameter of the second protrusion 33 are set slightly wider to have a greater bearing capacity. If the thickness of the protrusion is set too thin, the protrusion will be subjected to too much force and is easy to deform. The diameter of the second protrusion 33 is set too small, that is, the diameter of the second protrusion 33 is only slightly larger than the diameter of the groove. In the later stage, due to excessive wear and force, slipping may occur, which may easily cause safety accidents. Therefore, when setting the protrusion, the diameter of the protrusion can be slightly larger, and the thickness of the second protrusion 33 can also be set along the length of the light rod of the connecting shaft, which is convenient for demolding, better pressure resistance, and higher stability.

[0029] In this embodiment, Figure 4 As shown, a boss 22 is provided at the bottom of the cylindrical cover body 2, and the boss 22 is arranged in the direction of the connecting shaft 3. The first through hole 21 is arranged on the boss 22, and the first through hole 21 is connected to the inside of the cylindrical cover body 2. The first internal thread 211 covers the inner wall of the first through hole 21. The boss 22 is provided to expand the overall width of the first internal thread in the first through hole, so that the connection between the cylindrical cover body 2 and the connecting shaft can be more stable, and the thickness of the bottom of the cylindrical cover body 2 can be set slightly thinner to reduce the weight of the cylindrical cover body 2.

[0030] In this embodiment, Figure 4 As shown, the boss 22 is trapezoidal, and the diameter of the boss 22 away from the cylindrical cover body 2 is smaller than the diameter of the boss 22 connected to the cylindrical cover body 2. This makes it more stable when pressure is applied to the cylindrical cover body 2, and the boss 22 and the cylindrical cover body 2 are integrally formed.

[0031] In this embodiment, the cylindrical cover 2 rotates clockwise. Figure 2 As shown, teeth 23 are provided around the opening of the cylindrical cover body 2, and a cutter 231 is provided at the top of the teeth 23. The right end of the cutter 231 is higher than the left end of the cutter 231, which is more conducive to the cutting of the cylindrical cover body 2 and saves time and effort for the user when using the hole opener.

[0032] In this embodiment, Figure 5-6As shown, the right end of the cutter 231 and the left end of the cutter 231 form an angle of 3°-6°. The angle does not need to be too large or too small. The setting of 3°-6° is more convenient for cutting the cylindrical cover body 2, making it easier for the user to use the hole opener.

[0033] In this embodiment, Figure 3 and 6 As shown, the end of the second end of the positioning drill 1 is provided with four blades 121, the second end of the positioning drill 1 is opposite to the first end of the positioning drill 1, the four blades 121 are arranged in a cross shape, and the top ends of the four blades 121 are connected to form a cone to form a cutter head 12, the cutter head 12 and the positioning drill 1 are integrally formed, and the arrangement of the four blades 121 makes it easier for the positioning drill to drill holes, making it more convenient and labor-saving for users to drill holes, thereby improving the customer's usage experience.

[0034] In this embodiment, the cylindrical cover 2 rotates clockwise. Figure 5-6 As shown, a left cutting surface 1211 and a right cutting surface 1212 are provided at the top of the blade 121. The left cutting surface 1211 is connected to the right cutting surface 1212 and forms a cone. The length of the left cutting surface 1211 extending in the cutting surface direction is greater than the length of the right cutting surface 1212 extending in the cutting surface direction. With this arrangement, cutting is faster and users save more effort.

[0035] In this embodiment, Figure 3-6 As shown, one end of the four blades 121 is connected to the side wall of the positioning drill 1 so that the diameter of the cutter head 12 is larger than the diameter of the positioning drill 1 to facilitate drilling.

[0036] In this embodiment, Figure 4 As shown, one or more discharge holes 24 are provided on the side wall of the cylindrical cover body 2 for discharging crumbs and foams to prevent the discharged crumbs and foams from being blocked in the cylindrical cover body 2, which is convenient for users to use.

[0037] In this embodiment, the positioning drill 1, the cylindrical cover 2 and the connecting shaft 3 are coaxially arranged, so that the center of gravity of the hole opener will not be offset when drilling, and the hole position is relatively straight.

[0038] The first external thread and the second internal thread on the connecting shaft are made of round steel material, processed into a thread shape by a lathe or a milling machine, and then heat treated to enhance the tensile strength and yield strength of the material.

[0039] In general, the connecting shaft and the positioning drill adopt a split structure. The first end of the connecting shaft is provided with a first external thread and a second internal thread, the first external thread is connected to the first internal thread of the cylindrical cover, the second internal thread is connected to the second external thread of the positioning drill, and the positioning drill is provided with a first protrusion 13 on one side of the second external thread, so the first protrusion 13 can play a role of blocking. Due to the first protrusion 13, the cross-sectional diameter of the position where the positioning drill is provided with the first protrusion 13 is different from the cross-sectional diameter of the position where the positioning drill is provided with the second external thread, thereby forming a cross-sectional blocking, so the positioning drill and the connecting shaft will not be stuck when the positioning drill is used, the positioning drill is screwed into the connecting shaft, and stops when it is screwed to the blocking part, and the diameter of the position where the positioning drill is provided with the protrusion is smaller than the diameter of the position where the connecting shaft is provided with the first external thread, so the connection between the positioning drill and the connecting shaft will not affect the connection between the connecting shaft and the cylindrical cover.

[0040] The working principle of the hole opener in this embodiment and the functions of the main components are as follows:

[0041] The second external thread on the positioning drill is aligned with the second internal thread on the connecting shaft, and the positioning drill is rotated and screwed into the connecting shaft. When the force of the electric drill or impact drill acts on the positioning drill through the thread structure of the connecting shaft and the positioning drill, there are mainly three forces: rotational torque, impact force and swing amplitude force. When the electric drill or impact drill is working, the rotational torque passes through the thread of the connecting shaft and the positioning drill, so that the thread converts the rotational motion into linear motion transmission motion. Since the positioning drill is provided with a first protrusion 13 on one side of the second external thread, the first protrusion 13 can play a role of blocking, so that the linear motion force of the thread of the connecting shaft acts on the first protrusion 13, and the interaction of the excessive force is converted to the connecting shaft, thereby avoiding the damage of the thread. Another impact force directly acts on the first protrusion 13 of the positioning drill through the connecting shaft, and the swing amplitude force, because the positioning drill and the connecting shaft are connected by a thread structure, the gap is small but the friction bite force is large, the swing amplitude force of the hole opener will be shared by the connecting shaft and the positioning drill, so as to better protect this structure and increase the tensile strength at the second internal thread of the connecting shaft.

[0042] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A hole opener, characterized in that: The hole opener comprises a positioning drill (1), a cylindrical cover (2) and a connecting shaft (3); a first end of the connecting shaft (3) is provided with a first external thread (31) and a second through hole (32); the second through hole (32) is arranged on the end surface of the first end of the connecting shaft (3); a second internal thread (321) is arranged on the inner wall of the second through hole (32); the second end of the connecting shaft (3) is used to be connected to a driving tool; a first through hole (21) for the positioning drill (1) to pass through is arranged near the middle of the bottom of the cylindrical cover (2); a first internal thread (211) is arranged on the inner wall of the first through hole (21); 1), the first internal thread (211) and the first external thread (31) are detachably connected so that the cylindrical cover body (2) can be detachably connected to the connecting shaft (3), the first end of the positioning drill (1) is provided with a second external thread (11), the second external thread (11) and the second internal thread (321) are detachably connected, and a first protrusion (13) is provided on the side of the positioning drill (1) close to the second external thread (11) and away from the first end of the positioning drill (1), and the diameter of the position where the first protrusion (13) is provided on the positioning drill (1) is greater than the diameter of the second through hole (32).

2. A hole opener according to claim 1, characterized in that: A second protrusion (33) is provided on the connecting shaft (3) at a side close to the first external thread (31) and away from the first end of the connecting shaft (3); the diameter of the connecting shaft (3) at a position where the second protrusion (33) is provided is greater than the diameter of the first through hole (21).

3. A hole opener according to claim 1, characterized in that: A boss (22) is provided at the bottom of the cylindrical cover body (2), and the boss (22) is arranged in the direction of the connecting shaft (3). The first through hole (21) is arranged on the boss (22), and the first through hole (21) is connected to the inside of the cylindrical cover body (2), and the first internal thread (211) covers the inner wall of the first through hole (21).

4. A hole opener according to claim 3, characterized in that: The boss (22) is trapezoidal in shape, and the diameter of the end of the boss (22) away from the cylindrical cover body (2) is smaller than the diameter of the end of the boss (22) connected to the cylindrical cover body (2).

5. The hole opener according to claim 1, characterized in that: Teeth (23) are arranged around the opening of the cylindrical cover body (2), a cutter (231) is arranged at the top of the teeth (23), and the right end of the cutter (231) is arranged higher than the left end of the cutter (231).

6. A hole opener according to claim 5, characterized in that: The right end of the cutter (231) forms an angle of 3°-6° with the left end of the cutter (231).

7. The hole opener according to claim 1, characterized in that: The end of the second end of the positioning drill (1) is provided with four blades (121); the second end of the positioning drill (1) is an opposite end to the first end of the positioning drill (1); the four blades (121) are arranged in a cross shape; and the top ends of the four blades (121) are connected to form a conical cutter head (12); the cutter head (12) and the positioning drill (1) are integrally formed.

8. A hole opener according to claim 7, characterized in that: The top of the blade (121) is provided with a left cutting surface (1211) and a right cutting surface (1212); the left cutting surface (1211) is connected to the right cutting surface (1212) to form a cone; the length of the left cutting surface (1211) extending in the cutting surface direction is greater than the length of the right cutting surface (1212) extending in the cutting surface direction.

9. The hole opener according to claim 7, characterized in that: One end of the blade (121) is connected to the side wall of the positioning drill (1) so that the diameter of the cutter head (12) is larger than the diameter of the positioning drill (1).

10. The hole opener according to claim 1, characterized in that: One or more discharge holes (24) are provided on the side wall of the cylindrical cover body (2).

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