Adapter for drill bit

Abstract

The utility model relates to the technical field of drill bit tools, in particular to an adapter for a drill bit, which comprises a connecting column and a sleeve sleeved on the connecting column. A first steel ball capable of moving in the radial direction is arranged on the groove wall of the first inserting groove, and a second steel ball capable of moving in the radial direction is arranged on the groove wall of the second inserting groove; when the sleeve moves to a first position in the axial direction of the connecting column, the sleeve abuts against the first steel ball and the second steel ball at the same time, the first steel ball and the second steel ball are inserted into a drill handle inserting groove formed in the drill handle and an output shaft inserting hole formed in the power output shaft respectively, the drill handle cannot be moved out of the first inserting groove, and the power output shaft cannot be moved out of the second inserting groove; also included is a spring mechanism for continuously positioning the sleeve in the first position. Two steel balls can be controlled at the same time through one sleeve, disassembly or assembly of the adapter, an electric wrench and a drill bit can be achieved at the same time by axially moving the sleeve, and using is more convenient and faster.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bit tools, and particularly relates to an adapter for a drill bit. Background Art

[0002] The step drill is also known as the pagoda drill. Because it can drill different hole diameters, it has a relatively wide application in the fields of wood and metal sheet processing. The step drill needs to be connected to an electric wrench through an adapter, and the electric wrench drives the adapter to drive the step drill to rotate.

[0003] The existing electric wrench, as Figure 2 shown, has an output shaft through hole 105 provided on its power output shaft 104. Figure 1 Shows an existing connector 101. This connector 101 is used to connect the drill bit to the electric wrench. One end of such a connector 101 is provided with a connector slot 103, and the power output shaft 104 of the electric wrench is inserted into this connector slot 103. A connector jack 102 communicating with the connector slot 103 is also provided on the connector 101. When inserting the power output shaft 104 of the electric wrench into the connector slot 103, it is necessary to ensure that the connector jack 102 is aligned with the output shaft through hole 105.

[0004] Due to the fact that the power output shafts 104 of existing electric wrenches are all provided with output shaft through holes 105, restricted by this design of the power output shaft 104, based on inertial thinking, the connection method between the existing connector 101 and the power output shaft 104 is all pin connection, that is, align the connector jack 102 with the output shaft through hole 105, and then insert the pin into the output shaft through hole 105 and the connector jacks 102 at both ends of the output shaft through hole 105. In addition, in order to prevent the pin from falling off, a rubber gasket needs to be put on the connector 101 to block the pin through the gasket, thereby preventing the pin from falling off.

[0005] However, this fixing method of pin plus gasket is neither fast in installation nor in disassembly. Moreover, the pin and the gasket are small in volume and are arranged independently of the connector. Therefore, the pin and the gasket are easy to lose.

[0006] At the connection end of the existing connector with the drill bit, a connection method of using steel balls to clamp the drill shank appears. A similar structure can be seen in the Chinese utility model patent with the publication number CN217195042U. This kind of connection method is more convenient to use. However, if this kind of connection method is used at the connection end of the connector and the electric wrench, it will face greater problems. That is, if this kind of structure is adopted at both ends of the connector, two operating sleeves need to be used, and each operating sleeve needs to have an axial stroke. After the two strokes are accumulated, the axial length of the connector will be too long. If the connector is too long, when the electric wrench drives the connector and the drill bit to rotate, the drill bit is likely to shake with the connector, which will cause the drill bit to not work properly. Summary of the Utility Model

[0007] In order to solve the problem that the connection between the existing connector and the power output shaft is not convenient and fast enough, the purpose of the present utility model is to provide an adapter for a drill bit.

[0008] The technical solution provided by the present utility model is as follows:

[0009] In a first aspect, an adapter for a drill bit includes a connecting column and a sleeve sleeved on the connecting column. Among them, the sleeve can reciprocate axially along the connecting column;

[0010] The connecting column and / or the sleeve is provided with a limiting mechanism, and this limiting mechanism is used to prevent the sleeve from falling off the connecting column;

[0011] One end of the connecting column is provided with a first slot for inserting the drill shank of the drill bit; the other end of the connecting column is provided with a second slot for inserting the power output shaft;

[0012] The inner wall of the first slot is provided with first steel balls that can move radially, and the inner wall of the second slot is provided with second steel balls that can move radially;

[0013] When the sleeve moves axially along the connecting column to the first position, the sleeve simultaneously abuts against the first steel ball and the second steel ball, so that the first steel ball and the second steel ball are respectively inserted into the drill shank slot provided on the drill shank and the output shaft jack provided on the power output shaft, making it impossible for the drill shank to be removed from the first slot and impossible for the power output shaft to be removed from the second slot;

[0014] When the sleeve moves axially along the connecting column to the second position, the sleeve does not abut against the first steel ball and the second steel ball, and the first steel ball and the second steel ball can respectively withdraw from the drill shank slot and the output shaft jack, making it possible for the drill shank to be removed from the first slot and making it possible for the power output shaft to be removed from the second slot;

[0015] It further includes a spring mechanism, and this spring mechanism is used to keep the sleeve in the first position continuously.

[0016] As an optional technical solution in the first aspect, the limiting mechanism is arranged at both ends of the adapter and is located between the inner wall of the sleeve and the outer surface of the connecting column;

[0017] The outer surface of the sleeve is a smooth curved surface.

[0018] Optionally, the limiting mechanism includes a first flange located at one end of the connecting column; a chute adapted to the first flange is provided on the inner wall of one end of the sleeve.

[0019] Optionally, the limiting mechanism further includes a clamp installed at the other end of the connecting column; a second flange adapted to the clamp is provided on the inner wall of the other end of the sleeve.

[0020] Optionally, the inner wall of the sleeve is further provided with a first protrusion, and a first avoidance groove is formed between the second flange and the first protrusion;

[0021] The inner wall of the sleeve is also provided with a second avoidance groove, and a second protrusion is formed between the slide groove and the second avoidance groove;

[0022] When the sleeve is in the first position, the first protrusion abuts against the first steel ball, and the second protrusion abuts against the second steel ball;

[0023] When the sleeve is in the second position, the first avoidance groove corresponds to the first steel ball, and the second avoidance groove corresponds to the second steel ball.

[0024] Optionally, the sleeve moves to a first position in a direction away from the second slot; and the sleeve moves to a second position in a direction approaching the second slot.

[0025] Optionally, the diameter of the end of the connecting column provided with the first slot is smaller than the diameter of the end of the connecting column provided with the second slot, and a step surface is formed at the connection between the two sections;

[0026] The inner diameter of the sleeve is adapted to the diameter of the connecting column;

[0027] The step surface is used to limit the sleeve from being separated from the end of the connecting column provided with the second slot.

[0028] Furthermore, a receiving cavity is formed between the inner wall of the sleeve and the outer surface of the connecting column, and the receiving cavity is located between the first protrusion and the step surface;

[0029] The spring mechanism comprises an elastic member, and the elastic member is arranged in the accommodating cavity;

[0030] When the sleeve moves from the first position to the second position, the elastic member is compressed.

[0031] As an optional technical solution, the end of the connecting column facing away from the second slot protrudes from the sleeve, and the length of the protruding section of the connecting column is not less than 8 cm.

[0032] Optionally, the connecting column is provided with a first through groove, the first steel ball is placed in the first through groove, and the diameter of the connection between the first through groove and the first slot is smaller than the diameter of the first steel ball;

[0033] The connecting column is provided with a second through groove, the second steel ball is placed in the second through groove, and the diameter of the connection point between the second through groove and the second slot is smaller than the diameter of the second steel ball.

[0034] Optionally, the sleeve is coaxially arranged with the connecting post, and the sleeve can rotate relative to the connecting post;

[0035] The second flange, the first avoidance groove, the first protrusion, the slide groove, the second avoidance groove, the second protrusion and the first flange are all ring-shaped.

[0036] Optionally, the first slot includes a limiting slot and a mounting slot, wherein the axial dimension of the limiting slot is greater than the axial dimension of the mounting slot, and the radial dimension of the limiting slot is greater than the radial dimension of the mounting slot;

[0037] The limiting slot is provided with a plurality of prism surfaces;

[0038] The mounting slot communicates with the first through slot.

[0039] In a second aspect, an adapter for a drill bit

[0040] comprises a connecting column and a sleeve sleeved on the connecting column, wherein the sleeve can reciprocate axially along the connecting column; a spring mechanism is arranged between the sleeve and the connecting column, and this spring mechanism is used to keep the sleeve in a first position continuously;

[0041] One end of the connecting column is provided with a first slot, and a radially movable first steel ball is arranged on the side wall of the first slot for connecting the drill shank of the drill bit;

[0042] The other end of the connecting column is provided with a second slot, and a radially movable second steel ball is arranged on the side wall of the second slot for connecting the power output shaft;

[0043] When the sleeve moves axially along the connecting column to the first position, the sleeve abuts against the first steel ball and the second steel ball at the same time, so that the first steel ball and the second steel ball are respectively inserted into the drill shank slot provided on the drill shank and the output shaft jack provided on the power output shaft, so that the drill shank cannot be removed from the first slot, and the power output shaft cannot be removed from the second slot;

[0044] When the sleeve moves axially along the connecting column to the second position, the first steel ball and the second steel ball can respectively withdraw from the drill shank slot and the output shaft jack, so that the drill shank can be removed from the first slot, and the power output shaft can be removed from the second slot;

[0045] The end of the connecting column provided with the first slot is a large-diameter end, the other end is a small-diameter end, a step surface is formed at the connection of the two sections, and a clamp is provided at the small-diameter end of the connecting column.

[0046] As an optional technical solution of the second aspect, the first slot includes a limiting slot and a mounting slot, wherein the limiting slot has a plurality of prism surfaces distributed at equal intervals for providing circumferential torque; the first steel ball is located at the position where the mounting slot is located.

[0047] As an optional technical solution of the second aspect, the axial dimension of the limiting slot is greater than the axial dimension of the mounting slot, and the radial dimension of the limiting slot is greater than the radial dimension of the mounting slot.

[0048] As an optional technical solution of the second aspect, the cross section of the mounting slot is circular.

[0049] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0050] The utility model adopts one sleeve to control two steel balls at the same time, and the adapter, the power output shaft and the drill bit can be disassembled or installed at the same time by axially moving the sleeve, which is more convenient and quick to use.

[0051] In addition, since only one sleeve can control two steel balls at the same time, the overall axial stroke of the sleeve is short and the overall axial length of the adapter is appropriate, which is beneficial to reducing the shaking generated when the adapter and the drill bit rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the connection between the connector and the drill bit in the prior art;

[0053] Figure 2 It is a schematic diagram of an electric wrench in the prior art;

[0054] Figure 3 It is a schematic diagram of the output shaft structure of an electric wrench in the prior art;

[0055] Figure 4 This is a cross-sectional view of an adapter in one embodiment of the present application;

[0056] Figure 5 This is a cross-sectional view of a sleeve in one embodiment of the present application;

[0057] Figure 6 This is a cross-sectional view of a connecting column in one embodiment of the present application;

[0058] Figure 7 This is a schematic diagram of the drill bit structure in one embodiment of the present application.

[0059] Explanation of the symbols in the schematic diagram:

[0060] Connector 101, connector jack 102, connector slot 103, power output shaft 104, output shaft through hole 105;

[0061] Sleeve 201, first protrusion 202, first avoidance groove 203, second flange 204, accommodating cavity 205, slide groove 206, second avoidance groove 207, second protrusion 208;

[0062] Connecting column 301, clamp groove 302, first through groove 303, first insertion slot 304, elastic member 305, step surface 306, second through groove 307, first flange 308, second insertion slot 309;

[0063] A first steel ball 401, a second steel ball 402, and a clamp 403;

[0064] The top of the drill bit 501, the limiting part 502, the mounting part 503, and the card slot 504. Specific implementation mode

[0065] To further understand the content of the present utility model, the present utility model will be described in detail in conjunction with the accompanying drawings and embodiments.

[0066] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the efficacy that the present invention can produce and the purpose that can be achieved, should still fall within the scope that the technical content disclosed by the present utility model can cover. At the same time, terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope that the present invention can implement.

[0067] In one embodiment, the present utility model proposes an adapter for a drill bit. One end of this adapter is connected to the drill bit, and the other end is connected to the power output shaft, such as the output shaft of an electric wrench. Thus, the drill bit is connected to the power output shaft through this adapter, and the drill bit can be driven to rotate by the power output shaft driving the adapter.

[0068] As Figures 4 - 6 shown, the adapter includes a connecting column 301 and a sleeve 201 sleeved on the connecting column 301. Among them, after the connecting column 301 is respectively connected to the drill bit and the power output shaft 104, the connecting column 301 is coaxial with the drill bit and the power output shaft 104. Specifically, a first slot 304 is provided at one end of the connecting column 301 for the drill shank of the drill bit to be inserted, and a second slot 309 is provided at the other end of the connecting column 301 for the power output shaft 104 of the electric wrench to be inserted.

[0069] In order to fix the drill shank and the power output shaft 104 and prevent the drill shank and the power output shaft 104 from detaching from the connecting column 301, a first steel ball 401 capable of radial movement is provided on the inner wall of the first slot 304, and a second steel ball 402 capable of radial movement is provided on the inner wall of the second slot 309.

[0070] After the power output shaft 104 is inserted into the second slot 309, the second steel ball 402 moves radially. Part of the second steel ball 402 is inserted into the output shaft through hole 105, and part is still in the connecting column 301, so that the power output shaft 104 cannot move axially relative to the connecting column 301, that is, the power output shaft 104 can be prevented from detaching from the connecting column 301.

[0071] After inserting the drill shank into the first slot 304, the first steel ball 401 is radially moved. Part of the first steel ball 401 is inserted into the card slot 504 provided on the drill shank, and part of it is still in the connecting column 301, so that the drill shank cannot move axially relative to the connecting column 301, that is, the drill shank can be prevented from detaching from the connecting column 301.

[0072] When the drill shank and the power output shaft 104 are fixed by the first steel ball 401 and the second steel ball 402 respectively, in order to keep the first steel ball 401 and the second steel ball 402 always fix the drill shank and the power output shaft 104 when the drill bit rotates, the sleeve 201 is allowed to reciprocate axially along the connecting column 301. When the sleeve 201 axially moves along the connecting column 301 to the first position, the sleeve 201 simultaneously abuts against the first steel ball 401 and the second steel ball 402, so that the first steel ball 401 and the second steel ball 402 are respectively inserted into the drill shank slot provided on the drill shank and the power output shaft jack provided on the output shaft, making the drill shank unable to move out of the first slot 304 and the power output shaft unable to move out of the second slot 309.

[0073] When it is necessary to remove the drill bit from the adapter and separate the adapter from the power output shaft 104, the sleeve 201 is axially moved along the connecting column 301 to the second position. At this time, the sleeve 201 does not abut against the first steel ball 401 and the second steel ball 402, and the first steel ball 401 and the second steel ball 402 can respectively withdraw from the drill shank slot and the power output shaft jack, making the drill shank able to move out of the first slot 304 and the power output shaft able to move out of the second slot 309.

[0074] In this solution, one sleeve 201 can control two steel balls at the same time. By axially moving one sleeve 201, the two steel balls can be controlled simultaneously, and the fixing or disassembly of the adapter with the electric wrench and the drill bit can be controlled more conveniently. In addition, when the sleeve 201 is sleeved on the connecting column 301, the sleeve 201 can also block the first steel ball 401 and the second steel ball 402, preventing the first steel ball 401 and the second steel ball 402 from falling off the connecting column 301.

[0075] Since it is necessary to ensure that the drill bit does not fall off the connecting column 301 during the rotation of the drill bit, and at the same time it is necessary to ensure that the connecting column 301 does not fall off the power output shaft 104, it is necessary to ensure that the sleeve 201 does not axially move and switch positions during the rotation of the drill bit. In this solution, the adapter further includes a spring mechanism, through which the sleeve 201 can be continuously in the first position, that is, the axial displacement of the sleeve 201 can be avoided through the spring mechanism, so that the sleeve 201 can always fix the drill shank and the power output shaft 104 by the first steel ball 401 and the second steel ball 402 respectively during the rotation of the drill bit.

[0076] Since the sleeve 201 is sleeved on the connecting column 301, in order to prevent the sleeve 201 from falling off the connecting column 301, the adapter further includes a limiting mechanism, which can be disposed on the connecting column 301 and / or the sleeve 201. Through this limiting mechanism, it can be ensured that the sleeve 201 can only reciprocate within a certain axial length and will not fall off the connecting column 301.

[0077] Regarding the installation method of the first steel ball 401 and the second steel ball 402, in an alternative embodiment, the connecting column 301 is provided with a first through groove 303, the first steel ball 401 is placed in the first through groove 303, one end of the first through groove 303 communicates with the first slot 304, the other end of the first through groove 303 communicates with the gap between the connecting column 301 and the sleeve 201, and the diameter of the first through groove 303 at the connection with the first slot 304 is smaller than the diameter of the first steel ball 401.

[0078] The connecting column 301 is provided with a second through groove 307, the second steel ball 402 is placed in the second through groove 307, one end of the second through groove 307 communicates with the second slot 309, the other end of the second through groove 307 communicates with the gap between the connecting column 301 and the sleeve 201, and the diameter of the second through groove 307 at the connection with the second slot 309 is smaller than the diameter of the second steel ball 402.

[0079] A part of the first steel ball 401 can be pushed into the first slot 304, but it will not completely enter the first slot 304. When a radial movement space is left for the first steel ball 401, the first steel ball 401 can completely leave the first slot 304. Similarly, a part of the second steel ball 402 can be pushed into the second slot 309, but it will not completely enter the second slot 309. When a radial movement space is left for the second steel ball 402, the second steel ball 402 can completely leave the second slot 309.

[0080] Regarding the setting position of the limiting mechanism, in an alternative solution, the limiting mechanism is disposed at both ends of the adapter, so that the sleeve 201 can only reciprocate within an axial length restricted by the limiting mechanisms at both ends, so as to abut or not abut the first steel ball 401 and the second steel ball 402. It should be noted that the limiting mechanism is not limited to being disposed at both ends of the adapter, and it can also be disposed in the middle of the adapter.

[0081] The limiting mechanism is located between the inner wall of the sleeve 201 and the outer surface of the connecting column 301, keeping the outer surface of the sleeve 201 as a smooth curved surface. The limiting mechanism is located between the inner wall of the sleeve 201 and the outer surface of the connecting column 301, that is, inside, which can reduce the occurrence of accidental touches. The outer surface of the sleeve 201 being a smooth curved surface also helps to improve the comfort during holding, and the air resistance when the sleeve 201 rotates is lower, making the adapter more stable when rotating.

[0082] For the limiting mechanism, in an alternative embodiment, the limiting mechanism includes a clamp 403, and the clamp 403 is installed at one end of the connecting column 301 close to the first slot 304. Specifically, a clamp groove 302 is provided at one end of the connecting column 301 close to the first slot 304, and the clamp 403 is installed in the clamp groove 302. At the same time, a second flange 204 adapted to the clamp 403 is provided on the inner wall of the sleeve 201. When the sleeve 201 moves towards the end of the connecting column 301 where the clamp 403 is provided and the clamp 403 abuts against the second flange 204, the sleeve 201 cannot continue to move towards the end of the connecting column 301 where the clamp 403 is provided, thereby preventing the sleeve 201 from falling off the connecting column 301 at this end.

[0083] Due to the adoption of the structure of the clamp 403, which can be disassembled and assembled repeatedly, when it is necessary to remove the sleeve 201 from the connecting column 301, the clamp 403 can be removed, and then the sleeve 201 can be taken off from the end of the connecting column 301 where the clamp 403 is provided. When it is necessary to reinstall the sleeve 201, the sleeve 201 is sleeved on the connecting column 301, and then the clamp 403 is installed.

[0084] The diameter of one end of the connecting column 301 where the first slot 304 is provided is smaller than the diameter of the end where the second slot 309 is provided, and a step surface 306 is formed at the connection of the two sections. The inner diameter of the sleeve 201 is adapted to the diameter of the connecting column 301. At this time, the step surface 306 can also play a limiting role, that is, the step surface 306 can prevent the sleeve 201 from detaching from the end of the connecting column 301 where the second slot 309 is provided.

[0085] In an alternative solution, the limiting mechanism further includes a first flange 308, and the first flange 308 is located at one end of the connecting column 301 close to the second slot 309. A chute 206 adapted to the first flange 308 is provided on the inner wall of the sleeve 201. When the sleeve 201 moves towards the end of the connecting column 301 where the first flange 308 is provided until the bottom of the chute 206 abuts against the first flange 308, the sleeve 201 cannot continue to move towards the end of the connecting column 301 where the first flange 308 is provided. At this time, a limiting effect is formed at the end of the connecting column 301 where the first flange 308 is provided, which can prevent the sleeve 201 from falling off the connecting column 301 at this end.

[0086] For the limiting mechanism, in another alternative embodiment, the limiting mechanism can be clamps installed at both ends of the connecting column 301. At this time, when the bottom of the chute 206 abuts against the clamp on the same side, the sleeve 201 cannot continue to move towards this end. The clamps at both ends in this embodiment can be disassembled and assembled multiple times, and the sleeve 201 can be taken off from either end of the connecting column 301.

[0087] For the limiting mechanism, in another alternative embodiment, the limiting mechanism may be first flanges provided at both ends of the connecting column 301. When the second flange on one side abuts against the first flange, the sleeve 201 cannot continue to move towards this side. In this embodiment, the sleeve 201 cannot be removed from the connecting column 301.

[0088] Regarding the structure of the sleeve 201, in an alternative embodiment, as Figure 5 shown, a first protrusion 202 is further provided on the inner wall of the sleeve 201, and a first avoidance groove 203 is formed between the second flange 204 and the first protrusion 202. A second avoidance groove 207 is further provided on the inner wall of the sleeve 201, and a second protrusion 208 is formed between the sliding groove 206 and the second avoidance groove 207.

[0089] In this embodiment, when the sleeve 201 is in the first position, the first protrusion 202 abuts against the first steel ball 401, and the second protrusion 208 abuts against the second steel ball 402. At this time, when the drill bit shank is inserted into the first slot 304, a part of the first steel ball 401 is inserted into the card slot 504 provided on the drill bit shank, so that the drill bit will not fall off from the connecting column 301. Similarly, when the power output shaft 104 is inserted into the second slot 309, a part of the second steel ball 402 is inserted into the output shaft through hole 105 provided on the power output shaft 104, so that the connecting column 301 will not fall off from the power output shaft 104.

[0090] In this embodiment, when the sleeve 201 is in the second position, the first avoidance groove 203 corresponds to the first steel ball 401, and the second avoidance groove 207 corresponds to the second steel ball 402. Then when the drill bit shank or the power output shaft 104 is pulled out, the avoidance groove provides a radial movement space for the steel ball, and the steel ball will be pushed into the avoidance groove, so that the drill bit shank or the power output shaft 104 can be pulled out.

[0091] Since the sleeve 201 is integrally designed, at this time, as long as the sleeve 201 axially moves a stroke of one avoidance groove, the first avoidance groove 203 can correspond to the first steel ball 401, and at the same time the second avoidance groove 207 can correspond to the second steel ball 402. Since the axial stroke of the sleeve 201 is only the stroke of one avoidance groove, the overall axial length of the adapter is appropriate, thereby avoiding the problem that the drill bit shakes when rotating due to an overly long adapter.

[0092] Regarding the setting positions of the first avoidance groove 203 and the second avoidance groove 207, in an alternative scheme, the sleeve 201 moves towards the first position away from the electric wrench, and the sleeve 201 moves towards the second position close to the electric wrench, that is, the first avoidance groove 203 is provided on the side of the first protrusion 202 away from the electric wrench, and the second avoidance groove 207 is provided on the side of the second protrusion 208 away from the electric wrench.

[0093] As Figure 3As shown, the distance L2 between the through hole 105 of the output shaft of the existing electric wrench and the end of the power output shaft 104 is fixed. In the adapter, the length of the second steel ball 402 from the end of the connecting column 301 near the electric wrench is also limited to L2. The end of the connecting column 301 near the electric wrench cannot extend further towards the electric wrench. Since the end of the connecting column 301 near the electric wrench needs to cooperate with the socket 201 to achieve positioning, the length L1 of the second protrusion 208 for pressing against the second steel ball 402 from the end of the socket 201 near the electric wrench is not sufficient to leave space for setting the second relief groove 207. Therefore, the second relief groove 207 needs to be set on the side of the second protrusion 208 away from the electric wrench. Additionally, when the second relief groove 207 is set on the side of the second protrusion 208 away from the electric wrench, the adapter can be pulled out from the electric wrench only when the socket 201 is pushed towards the electric wrench until the second relief groove 207 is aligned with the second steel ball 402. Pushing the socket 201 towards the electric wrench will make the length of the end of the connecting column 301 away from the electric wrench protrude more from the socket 201. At this time, it is beneficial to leave a larger space for the user to hold the protruding section with fingers, which is conducive to pulling out the adapter from the electric wrench.

[0094] For the spring mechanism, in one solution, a receiving cavity 205 is formed between the inner wall of the socket and the outer surface of the connecting column. This receiving cavity 205 is located between the first protrusion 202 and the step surface 306. The spring mechanism includes an elastic member 305, which is disposed in the receiving cavity 205. The two ends of the elastic member 305 are respectively abutted against the first protrusion 202 and the step surface 306.

[0095] When the socket 201 is moved from the first position to the second position by an external force, the elastic member 305 is compressed. When the external force applied to the socket 201 disappears, the socket 201 will return to the first position under the elastic force of the elastic member 305, thus preventing the drill bit and the power output shaft 104 from falling off the adapter.

[0096] For the elastic member 305, a helical spring can be selected, or other structures with elastic restoring force can also be selected. This is relatively mature in the prior art and will not be elaborated here.

[0097] When it is necessary to separate the adapter from the electric wrench, in order to facilitate the user to pull out the connecting column 301 from the power output shaft 104, in an alternative solution, when the sleeve 201 is in the first position, the clamp 403 abuts against the second flange 204; when the sleeve 201 is in the second position, the first flange 308 abuts against the second protrusion 208. One end of the connecting column 301 away from the electric wrench protrudes from the sleeve 201, and the length of the protruding section is not less than 8 cm. For example, it can be 8 cm, or it can be 10 cm, etc. Push the sleeve 201 towards the electric wrench to move it from the first position to the second position, and then the user can hold the protruding section by hand. The protruding section provides a force application point, which facilitates the user to pull out the connecting column 301 from the power output shaft 104.

[0098] In order to increase the friction, knurling can be processed on the outer surface of the protruding section.

[0099] As an alternative solution, the sleeve 201 can be coaxially arranged with the connecting column 301, and the sleeve 201 can rotate relative to the connecting column. At this time, the second flange 204, the first relief groove 203, the first protrusion 202, the sliding groove 206, the second relief groove 207, the second protrusion 208, and the first flange 308 are all annular.

[0100] Since the first flange 308, the sliding groove 206, and the second flange 204 are all annular, even if the sleeve 201 rotates, the limiting function is not affected.

[0101] Since the second protrusion 208, the second relief groove 207, the first relief groove 203, and the first protrusion 202 are all annular, even if the sleeve 201 rotates, it does not affect the abutment of the first steel ball 401 and the second steel ball 402 and the provision of a radial movement space for the first steel ball 401 and the second steel ball 402.

[0102] In an embodiment, the present invention also proposes an adapter for a drill bit, including a connecting column 301 and a sleeve 201 sleeved on the connecting column 301, wherein the sleeve 201 can reciprocally move along the axial direction of the connecting column 301. After the connecting column 301 is respectively connected to the drill bit and the power output shaft 104, the connecting column 301 is coaxial with the drill bit and the power output shaft 104. Specifically, a first slot 304 is provided at one end of the connecting column 301 for inserting the drill shank of the drill bit, and a second slot 309 is provided at the other end of the connecting column 301 for inserting the power output shaft 104 of the electric wrench.

[0103] In order to fix the drill shank and the power output shaft 104 and prevent the drill shank and the power output shaft 104 from separating from the connecting column 301, first steel balls 401 capable of radial movement are provided on the groove wall of the first slot 304, and second steel balls 402 capable of radial movement are provided on the groove wall of the second slot 309.

[0104] After inserting the power output shaft 104 into the second slot 309, the second steel ball 402 is radially moved. Part of the second steel ball 402 is inserted into the through hole 105 of the output shaft, and part of it is still in the connecting column 301, so that the power output shaft 104 cannot axially move relative to the connecting column 301, that is, the separation of the power output shaft 104 from the connecting column 301 can be avoided.

[0105] After inserting the drill shank into the first slot 304, the first steel ball 401 is radially moved. Part of the first steel ball 401 is inserted into the card slot 504 provided on the drill shank, and part of it is still in the connecting column 301, so that the drill shank cannot axially move relative to the connecting column 301, that is, the separation of the drill shank from the connecting column 301 can be avoided.

[0106] When the drill shank and the power output shaft 104 are fixed by the first steel ball 401 and the second steel ball 402 respectively, in order to ensure that the first steel ball 401 and the second steel ball 402 always keep the drill shank and the power output shaft 104 fixed when the drill bit rotates, the sleeve 201 is allowed to reciprocally move axially along the connecting column 301. When the sleeve 201 axially moves along the connecting column 301 to the first position, the sleeve 201 simultaneously abuts against the first steel ball 401 and the second steel ball 402, so that the first steel ball 401 and the second steel ball 402 are respectively inserted into the drill shank slot provided on the drill shank and the power output shaft hole provided on the output shaft, making the drill shank unable to move out of the first slot 304 and the power output shaft unable to move out of the second slot 309.

[0107] When it is necessary to remove the drill bit from the adapter and separate the adapter from the power output shaft 104, the sleeve 201 is axially moved along the connecting column 301 to the second position. At this time, the sleeve 201 does not abut against the first steel ball 401 and the second steel ball 402, and the first steel ball 401 and the second steel ball 402 can respectively withdraw from the drill shank slot and the power output shaft hole, making the drill shank able to move out of the first slot 304 and the power output shaft able to move out of the second slot 309.

[0108] In this solution, one sleeve 201 is used to control two steel balls at the same time. By axially moving one sleeve 201, the control of two steel balls can be realized simultaneously, and the fixation or disassembly of the adapter with the electric wrench and the drill bit can be controlled more conveniently. In addition, when the sleeve 201 is sleeved on the connecting column 301, the sleeve 201 can also block the first steel ball 401 and the second steel ball 402, preventing the first steel ball 401 and the second steel ball 402 from falling off the connecting column 301.

[0109] Since the drill bit needs to be ensured not to fall off the connecting column 301 during rotation, and at the same time, the connecting column 301 needs to be ensured not to fall off the power output shaft 104, it is necessary to ensure that the sleeve 201 does not axially move and change position during the rotation of the drill bit. In this solution, the adapter further includes a spring mechanism, through which the sleeve 201 can be continuously in the first position, that is, the spring mechanism is used to prevent the sleeve 201 from axially displacing, so that the sleeve 201 can always fix the first steel ball 401 and the second steel ball 402 to the drill shank and the power output shaft 104 respectively during the rotation of the drill bit.

[0110] To prevent the sleeve 201 from falling off the connecting column 301, one end of the connecting column 301 with the first slot 304 is the large-diameter end, and the other end is the small-diameter end. The connection between the two sections forms a step surface 306, and a snap ring 403 is provided at the small-diameter end of the connecting column 301. In this way, the step surface 306 and the snap ring 403 form restrictions at both ends respectively, so that the sleeve 201 can only reciprocate within an axial distance and will not fall off the connecting column 301. Only after removing the snap ring 403 can the sleeve 201 be removed from this end of the connecting column 301 where the snap ring 403 is provided.

[0111] Specifically, the first slot 304 includes a limiting slot and a mounting slot. The limiting slot corresponds to the limiting part 502 of the drill bit, and the mounting slot corresponds to the mounting part 503 of the drill bit. The limiting slot and the mounting slot are arranged to penetrate in sequence, and the limiting slot is closer to the slot mouth of the first slot 304. The limiting slot has a plurality of equally spaced prism surfaces, such as three or six, etc. The limiting slot is used to provide circumferential torque, that is, to drive the drill bit to rotate, and at the same time, to limit the rotation of the drill bit relative to the connecting column 301. The first steel ball 401 is located at the position of the mounting slot, that is, the first steel ball 401 is partially inserted into the card slot 504, so as to prevent the drill bit from falling off the connecting column 301.

[0112] As an alternative technical solution, the axial dimension of the limiting slot is larger than the axial dimension of the mounting slot, and the radial dimension of the limiting slot is larger than the radial dimension of the mounting slot. At this time, the axial dimension of the limiting part 502 of the drill bit connected thereto is larger than the axial dimension of the mounting part 503, and the radial dimension of the limiting part 502 is also larger than the radial dimension of the mounting part 503. Both the mounting part 503 and the limiting part 502 are connected to the adapter at the same time, so that the mounting part 503 and the limiting part 502 undertake different functions respectively, that is, the limiting part 502 undertakes the torsion, and the mounting part 503 prevents the drill bit from falling off the connecting column 301. In this way, the size of the mounting part 503 can be made smaller, and the mounting part 503 can be made not to undertake the torsion to avoid its damage. At the same time, the size of the limiting part 502 that needs to undertake the torsion can be made larger, and the surface prism of the limiting part 502 can be smoothly extended, so as to improve the strength of the limiting part 502 and make the drill shank not prone to the phenomenon of broken shank.

[0113] Regarding the shape of the mounting slot, in one solution, the cross-section of the mounting slot is circular, which facilitates the direct insertion of the mounting portion 503 of the drill bit into the mounting slot.

[0114] The present utility model also proposes a drill bit, as Figure 7 shown. The drill bit includes a drill bit top 501 and a drill shank, and the drill shank includes a limiting portion 502. One end of the limiting portion 502 is connected to the drill bit top 501, and the other end is connected with a mounting portion 503. An annular clamping groove 504 is provided on the mounting portion 503. The mounting portion 503 is used to prevent the drill bit from falling off the adapter, and the limiting portion 502 is used to prevent the drill bit from rotating relative to the adapter.

[0115] The axial dimension of the limiting portion 502 is greater than the axial dimension of the mounting portion 503, and the radial dimension of the limiting portion 502 is also greater than the radial dimension of the mounting portion 503. Both the mounting portion 503 and the limiting portion 502 are connected to the adapter at the same time, so that the mounting portion 503 and the limiting portion 502 undertake different functions respectively, that is, the limiting portion 502 undertakes torque, and the mounting portion 503 prevents the drill bit from falling off the connecting column 301. In this way, the size of the mounting portion 503 can be made smaller, and the mounting portion 503 does not need to undertake torque to avoid its damage. At the same time, the size of the limiting portion 502 that needs to undertake torque can be made larger, and the surface prism of the limiting portion 502 can be smoothly extended, thereby improving the strength of the limiting portion 502 and making the drill shank not prone to the phenomenon of broken shank.

[0116] Correspondingly, the first slot 304 includes a limiting slot and a mounting slot. Among them, the axial dimension of the limiting slot is greater than the axial dimension of the mounting slot, and the radial dimension of the limiting slot is greater than the radial dimension of the mounting slot.

[0117] The limiting slot is provided with a plurality of prism surfaces, such as three prism surfaces. The mounting slot is communicated with the first through slot 303. When the drill shank of the drill bit is inserted into the first slot 304, the mounting portion 503 of the drill shank is inserted into the mounting slot, and the clamping groove 504 is aligned with the first slot 304. The limiting portion 502 of the drill shank is correspondingly inserted into the limiting slot. When the adapter drives the drill bit to rotate, only the limiting portion 502 undertakes torque. Since the size of the limiting portion 502 is large and the limiting portion 502 is a continuous and non-sunken integral structure on the surface, the limiting portion 502 is not prone to the phenomenon of broken shank.

[0118] The above has schematically described the present utility model and its embodiments. This description is not restrictive. What is shown in the drawings is only one of the embodiments of the present utility model, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural forms and embodiments without creative work without departing from the creative concept of the present utility model, they should all fall within the protection scope of the present utility model.

Claims

1. An adapter for a drill bit, characterized in that: It includes a connecting column (301) and a sleeve (201) sleeved on the connecting column (301), wherein the sleeve (201) can reciprocate axially along the connecting column (301); The connecting column (301) and / or the sleeve (201) is provided with a limiting mechanism, and this limiting mechanism is used to prevent the sleeve (201) from falling off the connecting column (301); One end of the connecting column (301) is provided with a first slot (304), and this first slot (304) is used for the drill shank of the drill bit to be inserted; the other end of the connecting column (301) is provided with a second slot (309), and this second slot (309) is used for the power output shaft to be inserted; The inner wall of the first slot (304) is installed with a first steel ball (401) that can move radially, and the inner wall of the second slot (309) is installed with a second steel ball (402) that can move radially; When the sleeve (201) moves axially along the connecting column (301) to the first position, the sleeve (201) simultaneously abuts against the first steel ball (401) and the second steel ball (402), so that the first steel ball (401) and the second steel ball (402) are respectively inserted into the drill shank slot provided on the drill shank and the output shaft jack provided on the power output shaft, making it impossible for the drill shank to be removed from the first slot (304) and making it impossible for the power output shaft to be removed from the second slot (309); When the sleeve (201) moves axially along the connecting column (301) to the second position, the sleeve (201) does not abut against the first steel ball (401) and the second steel ball (402), and the first steel ball (401) and the second steel ball (402) can respectively withdraw from the drill shank slot and the output shaft jack, making it possible for the drill shank to be removed from the first slot (304) and making it possible for the power output shaft to be removed from the second slot (309); It further includes a spring mechanism, and this spring mechanism is used to keep the sleeve (201) continuously in the first position.

2. The adapter according to claim 1, characterized in that: The limiting mechanism includes a clamp (403), and the clamp (403) is installed at one end of the connecting column (301) close to the first slot (304); The inner wall of the sleeve (201) is provided with a second flange (204) adapted to the clamp (403).

3. The adapter according to claim 2, characterized in that: The limiting mechanism further includes a first flange (308), and the first flange (308) is located at the other end of the connecting column (301); The inner wall of the other end of the sleeve (201) is provided with a chute (206) adapted to the first flange (308).

4. The adapter according to claim 3, characterized in that: The inner wall of the sleeve (201) is further provided with a first protrusion (202), and a first avoidance groove (203) is formed between the second flange (204) and the first protrusion (202); The inner wall of the sleeve (201) is further provided with a second avoidance groove (207), and a second protrusion (208) is formed between the chute (206) and the second avoidance groove (207); When the sleeve (201) is in the first position, the first protrusion (202) abuts against the first steel ball (401), and the second protrusion (208) abuts against the second steel ball (402); When the sleeve (201) is in the second position, the first avoidance groove (203) corresponds to the first steel ball (401), and the second avoidance groove (207) corresponds to the second steel ball (402).

5. The adapter according to claim 1, characterized in that: The diameter of one end of the connecting column (301) provided with the first slot (304) is smaller than the diameter of one end of the connecting column (301) provided with the second slot (309), and a step surface (306) is formed at the connection between the two sections; The inner diameter of the sleeve (201) is adapted to the diameter of the connecting column (301); The step surface (306) is used to limit the sleeve (201) from being separated from the end of the connecting column (301) provided with the second slot (309).

6. The adapter according to claim 5, characterized in that: An accommodating cavity (205) is formed between the inner wall of the sleeve and the outer surface of the connecting column, and the accommodating cavity (205) is located between the first protrusion (202) and the step surface (306); The spring mechanism comprises an elastic member (305), and the elastic member (305) is arranged in the accommodating cavity (205); When the sleeve (201) moves from the first position to the second position, the elastic member (305) is compressed.

7. The adapter according to any one of claims 4 to 6, characterized in that: When the sleeve (201) is in the first position, the clamp (403) abuts against the second flange (204); When the sleeve (201) is in the second position, the first flange (308) abuts against the second protrusion (208), and the end of the connecting column (301) away from the second slot (309) protrudes from the sleeve (201), and the length of the protruding section of the connecting column is not less than 8 cm.

8. The adapter according to claim 1, characterized in that: The connecting column (301) is provided with a first through groove (303), the first steel ball (401) is placed in the first through groove (303), and the diameter of the connection point between the first through groove (303) and the first insertion slot (304) is smaller than the diameter of the first steel ball (401); The connecting column (301) is provided with a second through groove (307), the second steel ball (402) is placed in the second through groove (307), and the diameter of the connection point between the second through groove (307) and the second insertion slot (309) is smaller than the diameter of the second steel ball (402).

9. The adapter according to claim 8, characterized in that: The sleeve (201) is coaxially arranged with the connecting column (301), and the sleeve (201) is rotatable relative to the connecting column; The second flange (204), the first avoidance groove (203), the first protrusion (202), the slide groove (206), the second avoidance groove (207), the second protrusion (208), and the first flange (308) are all ring-shaped.

10. The adapter according to claim 8, characterized in that: The first slot (304) comprises a limiting slot and a mounting slot, wherein the axial dimension of the limiting slot is larger than the axial dimension of the mounting slot, and the radial dimension of the limiting slot is larger than the radial dimension of the mounting slot; The limiting groove is provided with a plurality of prism surfaces; The hanging groove communicates with the first through groove (303).

11. A adapter for a drill bit, characterized in that: It includes a connecting column (301) and a sleeve (201) sleeved on the connecting column (301), wherein the sleeve (201) can reciprocate axially along the connecting column (301); a spring mechanism is provided between the sleeve (201) and the connecting column (301), and this spring mechanism is used to keep the sleeve (201) in the first position continuously; One end of the connecting column (301) is provided with a first slot (304), and the side wall of the first slot (304) is provided with a first steel ball (401) that can move radially, for connecting the shank of the drill bit; The other end of the connecting column (301) is provided with a second slot (309), and the side wall of the second slot (309) is provided with a second steel ball (402) that can move radially, for connecting the power output shaft; When the sleeve (201) moves axially along the connecting column (301) to the first position, the sleeve (201) simultaneously abuts against the first steel ball (401) and the second steel ball (402), so that the first steel ball (401) and the second steel ball (402) are respectively inserted into the shank slot provided on the shank of the drill bit and the output shaft hole provided on the power output shaft, so that the shank of the drill bit cannot be removed from the first slot (304), and the power output shaft cannot be removed from the second slot (309); When the sleeve (201) moves axially along the connecting column (301) to the second position, the first steel ball (401) and the second steel ball (402) can respectively withdraw from the shank slot and the output shaft hole, so that the shank of the drill bit can be removed from the first slot (304), and the power output shaft can be removed from the second slot (309); One end of the connecting column (301) where the first slot (304) is provided is a large-diameter end, and the other end is a small-diameter end. The connection part of the two sections forms a step surface (306), and a clamp (403) is provided at the small-diameter end of the connecting column (301).

12. The adapter according to claim 11, characterized in that: The first slot (304) includes a limiting groove and a hanging groove. Among them, the limiting groove has a plurality of prism surfaces evenly distributed at intervals, for providing circumferential torque; the first steel ball (401) is located at the position where the hanging groove is located.

13. The adapter according to claim 12, characterized in that: The axial dimension of the limiting groove is greater than the axial dimension of the hanging groove, and the radial dimension of the limiting groove is greater than the radial dimension of the hanging groove.

14. The adapter according to any one of claims 12 to 13, characterized in that: The cross-section of the hanging groove is circular.

Images