Bit clamping device and impact tool

Abstract

According to the technical scheme, the bit clamping device comprises an output shaft, the output shaft is provided with a wing part and a main body part, a placement hole is formed in the center of the main body part, and a groove communicated with the placement hole is formed in the side wall of the main body part; the ball is arranged in the groove and can move in the groove along the length direction of the main body part; the sliding sleeve is arranged at one end, far away from the wing part, of the main body part in a sleeving manner and is provided with a guide part and an abutting and pushing part, the guide part allows the ball to move in the direction far away from the placement hole in the radial direction of the main body part, and the abutting and pushing part abuts and pushes the ball in the direction close to the placement hole in the radial direction of the main body part; the limiting piece is arranged at one end, far away from the wing part, of the main body part; and the reset piece is arranged between the abutting and pushing part and the limiting piece, and therefore the effect that the screwdriver head can be conveniently and rapidly installed is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of electric tools, and in particular to a bit clamping device and an impact tool. Background Art

[0002] The working principle of an impact driver is that the motor drives the impact head to produce high-frequency vibrations, which transmit force to parts such as screws and nuts to loosen or tighten them. At the same time, the chuck can clamp the part to keep it in place for easy removal and installation. This high-frequency vibration and impact force make the impact driver easy to handle high-intensity working conditions, such as tightening large bolts or driving screws in hardwood.

[0003] In the related art, such as Chinese patent publication number CN1349447A, a tool holder is disclosed, including a quick connection mechanism actuated by inserting a single-head or double-head tool, wherein the tool engagement device forces the fixing device to change position, thereby the fixing device actuates the tool engagement device, and when the fixing device is manually operated, the tool engagement device is released, thereby the tool is pushed out of the tool holder, so that the user can operate the tool holder with only one hand.

[0004] However, the current method of clamping the screwdriver bit requires manual movement of the clamping device during the working process of the screwdriver bit to complete the installation of the screwdriver bit, and the installation efficiency is low, so it needs to be improved. Utility Model Content

[0005] Based on this, it is necessary to provide a bit clamping device and an impact tool to address the problem of low bit installation efficiency.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In one embodiment, a bit holding device is provided, comprising:

[0008] The output shaft comprises a wing portion and a main body portion, wherein a placement hole is provided at the center of the main body portion, and a groove communicating with the placement hole is provided on the side wall of the main body portion;

[0009] a ball, disposed in the groove and movable in the groove along the length direction of the main body;

[0010] A sliding sleeve is sleeved on an end of the main body away from the wing and has a guide portion and a push portion, wherein the guide portion allows the ball to move in a radial direction of the main body toward a direction away from the placement hole, and the push portion pushes the ball in a radial direction of the main body toward a direction close to the placement hole;

[0011] A stopper, arranged at one end of the main body away from the wing portion;

[0012] In another or other preferred embodiments, it is disposed between the pushing portion and the limiting member.

[0013] In another or other preferred embodiments, it further includes a magnetic member.

[0014] In another or other preferred embodiments, the magnetic member is disposed on the main body portion and on the side of the groove closer to the limiting member.

[0015] In another or other preferred embodiments, an embedding groove is formed on the main body portion on the side of the groove closer to the limiting member, and the magnetic member is embedded in the embedding groove.

[0016] In another or other preferred embodiments, a cushion member is further disposed in the embedding groove, and the cushion member is located on the surface of the magnetic member.

[0017] In another or other preferred embodiments, when the cushion member is installed in the embedding groove, the peripheral wall of the cushion member is flush with or lower than the outer side wall of the main body portion.

[0018] In another or other preferred embodiments, the embedding groove communicates with the groove, and a limiting portion is provided at the communicating portion of the embedding groove and the groove.

[0019] In another or other preferred embodiments, a retracted portion is provided at the communicating portion of the groove and the placement hole.

[0020] In another or other preferred embodiments, the placement hole is a blind hole, and a relief portion is provided on the bottom wall of the placement hole of the main body portion.

[0021] On the other hand, the present application also discloses an impact tool for driving a tool accessory, including:

[0022] A housing;

[0023] A motor, at least partially received in the housing;

[0024] A transmission assembly, connected to the motor to receive the power of the motor;

[0025] A striking assembly, connected to the transmission assembly and outputting a striking force;

[0026] An output shaft as described in any of the above embodiments, the output shaft receiving the striking force of the striking assembly and transmitting the striking force to the tool accessory.

[0027] In the embodiment of the present application, the ball is pushed by the bit to move in the groove, and the sliding sleeve is pushed in cooperation with the sliding sleeve and the reset member, so as to facilitate the quick installation of the bit into the placement hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the main structure of the bit clamping device in an embodiment of the present application;

[0029] Figure 2 Schematic diagram of the partial structure of the bit clamping device in an embodiment of the present application;

[0030] Figure 3 Schematic diagram of the internal structure of the impact tool in an embodiment of the present application.

[0031] Description of the drawings: 1. Output shaft; 11. Wing part; 12. Main body part; 13. Placement hole; 131. Relief part; 14. Groove; 141. Indented part; 2. Ball; 3. Sliding sleeve; 31. Guiding part; 32. Pushing part; 4. Limiting part; 5. Reset part; 6. Magnetic attracting part; 7. Embedded groove; 71. Pad part; 72. Limiting part; 8. Impact tool; 81. Outer shell; 82. Motor; 83. Transmission component. Detailed implementation manners

[0032] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In this application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0038] Refer to Figure 1 and Figure 2 , FIG. 1 shows a schematic diagram of the main structure of the bit clamping device in an embodiment of the present application, and FIG. 2 shows a schematic diagram of a partial structure of the bit clamping device in an embodiment of the present application. An embodiment of the present application provides a bit clamping device including an output shaft 1, a ball 2, a sliding sleeve 3, a limiting member 4 and a reset member 5, wherein the output shaft 1 has a wing portion 11 and a main body portion 12. The main body portion 12 can be made of cylindrical metal, and the wing portion 11 can be integrally formed at one end of the main body portion 12 and symmetrically provided with two. The wing portion 11 is used to receive the radial impact force from inside the impact tool 8. A placement hole 13 for placing tool accessories is formed inside the main body portion 12 in a hollow manner, and a groove 14 can be opened at one end of the main body portion 12 away from the wing portion 11, and the groove 14 can communicate with the placement hole 13.

[0039] In another or other preferred embodiments, the placement hole 13 can be a blind hole. The bottom wall of the blind hole can be integrally formed with the main body portion 12, or a filling block can be installed in the placement hole 13 to close the end of the placement hole 13. A relief portion 131 is further provided on the bottom wall of the main body portion 12 at the placement hole 13. The relief portion 131 can be a blind hole, and the size of the relief portion 131 can be smaller than that of the placement hole 13, that is, a stepped surface is formed between the relief portion 131 and the placement hole 13. Of course, it can be understood that the relief portion 131 can be located on the filling block. When the bit is a single-head bit, the end wall of the bit can abut against the bottom wall of the placement hole 13; when the bit is a double-head bit, the tip of the bit can be inserted into the relief portion 131.

[0040] Specifically, the groove 14 can be kidney-shaped along the length direction of the main body portion 12. An indentation portion 141 can be provided on one side of the groove 14 close to the placement hole 13. The indentation portion 141 can be integrally formed with the inner wall of the groove 14, or can be installed and fixed on the main body portion 12 by welding or other means. In the embodiment of the present application, the indentation portion 141 is integrally formed with the inner wall of the groove 14, that is, the size gradually decreases during the turning process of the groove 14 to form the indentation portion 141.

[0041] The sliding sleeve 3 is sleeved on one end of the main body portion 12 away from the wing portion 11, that is, on the outside of the groove 14. The sliding sleeve 3 further has a guiding portion 31 and a pushing portion 32. The guiding portion 31 can be an inclined surface or a curved surface. The guiding portion 31 is inclined in a direction away from the main body portion 12 along the length direction of the main body portion 12, so that the guiding portion 31 allows the ball 2 to move in the radial direction of the main body portion 12 away from the placement hole 13. At the same time, when the ball 2 is subjected to a force in the radial direction of the main body portion 12 away from the placement hole 13, under the action of the guiding portion 31, the sliding sleeve 3 can move in a direction away from the wing portion 11. The pushing portion 32 can be a flat surface or a curved surface. The pushing portion 32 pushes the ball 2 in the radial direction of the main body portion 12 away from the placement hole 13, thereby restricting the movement of the ball 2 in the radial direction of the main body portion 12.

[0042] In another or other preferred embodiments, the limiting member 4 can be a snap ring, and the limiting member 4 can be clamped at the end of one end of the main body portion 12 away from the wing portion 11. Optionally, in order to increase the contact area, a backing plate can be provided on the main body portion 12 on the side of the limiting member 4 close to the wing portion 11. Further, the backing plate and the limiting member 4 can be the same part, that is, the limiting member 4 can be a shaft retaining ring. Of course, the backing plate and the limiting member 4 can also be integrally formed, which can be understood by those skilled in the art.

[0043] In another or other preferred embodiments, the reset member 5 can be a spring, a rubber member, a leaf spring, a tension spring, etc. The reset member 5 is sleeved on the main body portion 12 and is located between the pushing portion 32 and the limiting member 4, as long as it can provide an elastic acting force for resetting the sliding sleeve 3.

[0044] In another or other preferred embodiments, the above-mentioned bit clamping device further includes a magnetic attraction member 6, and the magnetic attraction member 6 can be a magnet, which is used to attract the ball 2 and / or magnetize the bit.

[0045] In another or other preferred embodiments, the magnetic attraction member 6 is located on the main body portion 12 and on the side of the groove 14 closer to the limiting member 4. When the magnetic attraction member 6 is arranged in such a position, it can attract the ball 2 towards the limiting member 4. At this time, the ball 2 is not easily displaced under vibration, reducing the probability of the bit falling off accidentally due to the displacement of the ball 2 and the relatively large resistance at the front section of the bit.

[0046] In another or other preferred embodiments, an embedding groove 7 is formed on the main body portion 12 on the side of the groove 14 close to the limiting member 4. The embedding groove 7 can be a blind hole, and the magnetic attraction member 6 can be installed in the embedding groove 7 so that the magnetic attraction member 6 does not protrude from the surface of the main body portion 12.

[0047] In another or other preferred embodiments, a cushion member 71 is arranged in the embedding groove 7. The cushion member 71 can be made of wear-resistant materials such as plastic and polytetrafluoroethylene. The cushion member 71 is located on the surface of the magnetic attraction member 6 and covers the magnetic attraction member 6 in the embedding groove 7, thus playing a good protective role for the magnetic attraction member 6.

[0048] In another or other preferred embodiments, when the cushion member 71 is installed in the embedding groove 7, the peripheral wall of the cushion member 71 is flush with or lower than the outer side wall of the main body portion 12. In the embodiment of the present application, the peripheral wall of the cushion member 71 is flush with the outer side wall of the main body portion 12, so as to prevent the cushion member 71 from protruding from the outer side wall of the main body portion 12 and causing unnecessary wear.

[0049] In another or other preferred embodiments, the embedding groove 7 communicates with the groove 14. Since the magnetic attraction member 6 is installed therein, the communication between the embedding groove 7 and the groove 14 is more convenient for the magnetic force to be transmitted into the groove 14 to attract the ball 2.

[0050] In another or other preferred embodiments, a limiting portion 72 is provided at the communicating portion between the embedding groove 7 and the groove 14. The limiting portion 72 can be integrally formed on the side wall of the embedding groove 7 or installed on the side wall of the embedding groove 7, so as to limit the position of the magnetic attraction member 6.

[0051] Refer to Figure 3, Figure 3 shows a schematic internal structure diagram of an impact tool in an embodiment of the present application. In addition, based on the same inventive concept, an impact tool 8 is also disclosed in the embodiments of the present application. The impact tool 8 is used to drive a tool accessory to rotate and impact. The above-mentioned impact tool 8 includes a housing 81, a motor 82, a transmission assembly 83, a striking assembly, and the output shaft 1 in any of the above embodiments. Among them, at least part of the motor 82 is received in the housing 81. The transmission assembly 83 can be a gearbox. The transmission assembly 83 is connected to the motor 82 to receive the power of the motor 82. The striking assembly is used to convert the rotational force of the motor 82 into a striking force circumferentially along the output shaft 1. The striking assembly is connected to the transmission assembly 83 to output a striking force to the output shaft 1. The wing portion 11 of the output shaft 1 receives the striking force of the striking assembly and transmits the striking force to the tool accessory, thereby driving the fastener on the tool accessory to rotate.

[0052] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0053] The above embodiments only express several implementation manners of the present application. The description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A bit clamping device, characterized in that: include: The output shaft comprises a wing portion and a main body portion, wherein a placement hole is provided at the center of the main body portion, and a groove communicating with the placement hole is provided on the side wall of the main body portion; a ball, disposed in the groove and movable in the groove along the length direction of the main body; A sliding sleeve is sleeved on an end of the main body away from the wing and has a guide portion and a push portion, wherein the guide portion allows the ball to move in a radial direction of the main body toward a direction away from the placement hole, and the push portion pushes the ball in a radial direction of the main body toward a direction close to the placement hole; A stopper, arranged at one end of the main body away from the wing portion; The reset member is arranged between the push portion and the limit member.

2. The bit holding device according to claim 1, characterized in that: Also includes magnetic attachment.

3. The bit holding device according to claim 2, characterized in that: The magnetic attraction component is arranged on the main body and is located at a side of the groove closer to the limiting component.

4. The bit holding device according to claim 2, characterized in that: An embedding groove is provided on the main body at a side of the groove closer to the limiting member, and the magnetic attraction member is embedded in the embedding groove.

5. The bit holding device according to claim 4, characterized in that: A cushion is also provided in the embedding groove, and the cushion is located on the surface of the magnetic attraction component.

6. The bit holding device according to claim 5, characterized in that: When the cushion is installed in the embedding groove, the peripheral wall of the cushion is flush with the outer side wall of the main body or lower than the outer side wall of the main body.

7. The bit holding device according to claim 4, characterized in that: The embedding groove is communicated with the groove, and a limiting portion is arranged at the communicating portion between the embedding groove and the groove.

8. The bit holding device according to claim 1, characterized in that: A retracted portion is provided at the connection point between the groove and the placement hole.

9. The bit holding device according to claim 1, characterized in that: The placement hole is a blind hole, and the main body is located on the bottom wall of the placement hole and is provided with a yielding portion.

10. An impact tool, characterized in that: For driving tool accessories, including: shell; a motor at least partially contained in the housing; A transmission assembly connected to the motor to receive power from the motor; A striking component, connected to the transmission component and outputting striking force; The output shaft according to any one of claims 1 to 9, wherein the output shaft receives the striking force of the striking assembly and transmits the striking force to the tool accessory.

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