Bit mounting mechanism and impact screwdriver

Abstract

The utility model discloses a bit mounting mechanism and an impact screwdriver, and relates to the technical field of electric tools. The bit mounting mechanism comprises a working shaft, a spherical part and a first elastic part, an insertion hole with the length direction axially arranged is formed in one end of the working shaft, and a kidney-shaped hole with the length direction axially arranged is formed in the side wall of the insertion hole; the spherical piece is installed in the kidney-shaped hole in an axial moving mode and used for being matched with the screwdriver head inserted in the inserting hole in a limiting mode. The working shaft is sleeved with the first elastic piece, one end of the first elastic piece is connected with the working shaft, and the other end of the first elastic piece abuts against the spherical piece. The kidney-shaped hole is formed in the side wall of the inserting hole, and when the screwdriver head with the short tail end is inserted into the inserting hole, the spherical piece can move in the kidney-shaped hole, so that the tail end of the screwdriver head can abut against the tail end of the inserting hole, the screwdriver head is axially supported, extrusion force between the spherical piece and the screwdriver head annular groove during impact operation is reduced, and the service life of the screwdriver head is prolonged. And adhesion is prevented, and the influence on subsequent pulling-out of the bit is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a screwdriver bit mounting mechanism and an impact screwdriver. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] An impact screwdriver is a tool used to tighten or loosen screws. It is usually driven by an electric or pneumatic mechanism and uses impact force to provide fast, high-torque rotation to tighten or loosen screws. In order to improve the functionality of an impact screwdriver, the prior art provides a double-bit impact screwdriver. The double-bit impact screwdriver is usually equipped with two replaceable bits, such as a single bit with a screw hole at only one end and a double bit with screw holes at both ends. When screws of different specifications need to be tightened or loosened, a suitable bit can be selected for replacement to complete the corresponding task.

[0004] When the bit is assembled to the impact screwdriver, the spherical part on the side wall of the working shaft of the impact screwdriver is generally used to axially limit the annular groove of the bit to prevent the bit from slipping off the working shaft. However, due to the different lengths of the bit, there is a gap between the tail end of the bit and the tail end of the socket of the working shaft, which makes the support force of the bit completely borne by the spherical part. Under long-term impact operation, the spherical part is easy to stick to the annular groove of the bit, making it difficult to pull out the bit. Utility Model Content

[0005] The purpose of the utility model is to at least solve the problem that the existing impact screwdriver is easy to be difficult to pull out. This purpose is achieved through the following technical solutions:

[0006] The first object of the utility model is to propose a screwdriver bit installation mechanism, comprising: a working shaft, one end of the working shaft is provided with a socket arranged axially along the length direction, and the side wall of the socket is provided with a waist-shaped hole arranged axially along the length direction; a spherical member, the spherical member can be axially movably installed in the waist-shaped hole, and is used to limit the cooperation with the screwdriver bit inserted in the socket; and a first elastic member, the first elastic member is sleeved on the working shaft, one end of the first elastic member is connected to the working shaft, and the other end is against the spherical member.

[0007] According to the screwdriver bit installation mechanism of the utility model, a waist-shaped hole is provided on the side wall of the socket. When a screwdriver bit with a shorter tail end is inserted into the socket, the spherical part can move in the waist-shaped hole, so that the tail end of the screwdriver bit can be against the tail end of the socket, and the screwdriver bit is axially supported, thereby reducing the extrusion force between the spherical part and the screwdriver bit annular groove during impact operation, preventing the two from sticking together and avoiding affecting the subsequent removal of the screwdriver bit. In addition, after the current screwdriver bit is pulled out, the spherical part can be reset to the initial position by the elastic part, which is conducive to the spherical part falling into the annular groove of the screwdriver bit when the subsequent screwdriver bit is inserted, and facilitating the assembly of the screwdriver bit.

[0008] In addition, the screwdriver bit installation mechanism according to the utility model may also have the following additional technical features:

[0009] In some embodiments of the present invention, the spherical member moves from one end of the waist-shaped hole close to the opening of the plug hole to the other end away from the opening of the plug hole, and the first elastic member is compressed.

[0010] In some embodiments of the utility model, in a direction perpendicular to the axial direction of the working axis, the waist-shaped hole has two opposite side walls, and at least one of the two side walls is provided with a limiting structure, which is used to prevent the spherical part from entering the socket from the waist-shaped hole.

[0011] In some embodiments of the present invention, the bit mounting mechanism further includes a locking sleeve assembly, which is sleeved on the working shaft and is used to prevent the spherical member from escaping from the waist-shaped hole in a direction away from the insertion hole.

[0012] In some embodiments of the present invention, the locking sleeve assembly includes a locking sleeve body and a first retaining ring; the locking sleeve body is sleeved on the working shaft and covers the waist-shaped hole; the first retaining ring is sleeved on the working shaft and abuts against one end of the locking sleeve body away from the opening of the socket.

[0013] In some embodiments of the utility model, the inner wall surface of the lock sleeve body is provided with a retaining wall extending toward the waist-shaped hole, and the retaining wall is located at one end of the waist-shaped hole close to the opening of the insertion hole; when the spherical part is located at one end of the waist-shaped hole close to the opening of the insertion hole, the retaining wall and the spherical part are clearance-matched.

[0014] In some embodiments of the utility model, the bit mounting mechanism further includes an elastic limiting assembly; the elastic limiting assembly is sleeved on the working shaft and connected to the locking sleeve assembly; the elastic limiting assembly is used to limit the locking sleeve assembly from moving toward an opening close to the jack.

[0015] In some embodiments of the utility model, the elastic limit assembly includes a second clamping spring and a second elastic member; the second clamping spring is sleeved on one end of the working shaft where the insertion hole is opened, the second elastic member is sleeved on the working shaft and located in the lock sleeve assembly, and the second elastic member is respectively connected to the lock sleeve assembly and the second clamping spring;

[0016] In some embodiments of the utility model, the elastic limiting assembly also includes a washer; the washer is sleeved on the working shaft, the washer is located between the second elastic member and the second retaining spring, and is respectively connected to the second elastic member and the second retaining spring.

[0017] The second objective of the utility model is to provide an impact screwdriver having a bit mounting mechanism as described in the above technical solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 A partial structural diagram of a screwdriver bit installation mechanism according to an embodiment of the utility model is schematically shown;

[0020] Figure 2 The internal structure diagram of a screwdriver bit installation mechanism according to an embodiment of the utility model is schematically shown;

[0021] Figure 3 A schematic diagram of a screwdriver bit installation mechanism according to an embodiment of the utility model when installing double screwdriver bits is shown schematically;

[0022] Figure 4 A schematic diagram of a screwdriver bit installation mechanism according to an embodiment of the utility model when installing a single screwdriver bit is schematically shown;

[0023] Figure 5 A partial structural diagram of another bit installation mechanism according to an embodiment of the utility model is schematically shown.

[0024] The reference numerals are as follows:

[0025] 100, working axis; 110, jack; 111, opening; 112, T-shaped tail end; 120, waist-shaped hole; 130, annular depression; 200, spherical member; 300, first elastic member; 400, lock sleeve assembly; 410, lock sleeve body; 411, retaining wall; 4111, inclined surface; 420, first retaining spring; 500, elastic limit assembly; 510, second retaining spring; 520, second elastic member; 530, washer;

[0026] 1000, double screwdriver bit; 1100, first annular groove; 2000, single screwdriver bit; 2100, second annular groove. DETAILED DESCRIPTION

[0027] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0028] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0029] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0030] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0031] In a double-bit or multi-bit impact screwdriver, a variety of bits of different sizes are configured throughout, for example, a single bit with a screw hole at only one end and a double bit with screw holes at both ends. When the bit is assembled to the impact screwdriver, the annular groove of the bit is generally limited axially by a spherical piece on the side wall of the working shaft of the impact screwdriver to prevent the bit from slipping off the working shaft.

[0032] However, due to the different lengths of the bit, for example, the tail end of a single bit is shorter, so when the tail end of the double bit is against the tail end of the working shaft, there is easily a gap between the tail end of the single bit and the tail end of the working shaft, which makes the axial support force of the bit completely borne by the spherical part. Under long-term impact operation, the spherical part is prone to adhesion between the annular groove of the bit, making it difficult to pull out the bit, which in turn affects the subsequent replacement of the bit.

[0033] In view of this, the present embodiment provides a bit installation mechanism, aiming to solve the above technical problems by improving the working shaft structure.

[0034] Combined with Figure 1 and attached Figure 2 As shown in ( Figure 1 The locking sleeve assembly 400 is not shown in the figure. This embodiment provides a bit installation mechanism. The bit installation mechanism of this embodiment can be used for an impact screwdriver, and of course can also be used for electric tools such as electric screwdrivers or torque wrenches for tightening screws.

[0035] The bit installation mechanism provided in this embodiment mainly includes a working shaft 100, a spherical member 200 and a first elastic member 300. The working shaft 100 is connected to the output shaft of a driving motor of an electric tool such as an impact screwdriver, and the driving motor drives the working shaft 100 to rotate, thereby driving the bit on the working shaft 100 to rotate to loosen or tighten the screw.

[0036] One end of the working shaft 100 of this embodiment is provided with an insertion hole 110 arranged axially along the length direction. The insertion hole 110 has an opening 111 for the screwdriver bit to be inserted into and a T-shaped tail end 112 away from the opening 111. Different from the existing circular through hole structure, the side wall of the insertion hole 110 of this embodiment is provided with a waist-shaped hole 120 arranged axially along the length direction.

[0037] The spherical member 200 of this embodiment is installed in the waist-shaped hole 120. The spherical member 200 can move in the waist-shaped hole 120 along the axial direction of the working shaft 100 or in a direction parallel to the axial direction. Specifically, the spherical member 200 can move from one end of the waist-shaped hole 120 close to the opening 111 of the socket 110 to the other end away from the opening 111 of the socket 110. The spherical member 200 is used to limit the cooperation with the screwdriver bit inserted in the socket 110. For example, as shown in the figure, part of the spherical member 200 is limitedly cooperated with the annular groove of the screwdriver bit.

[0038] It should be noted that the length of the waist-shaped hole 120 of the present embodiment needs to satisfy the following requirements: when the single screwdriver bit 2000 is inserted, the spherical member 200 moves synchronously in the waist-shaped hole 120 and the single screwdriver bit 2000, and can make the tail end of the single screwdriver bit 2000 (the end located in the socket 110) abut against the T-shaped tail end 112 of the socket 110. In this way, the T-shaped tail end 112 can be directly used to provide axial support for the single screwdriver bit 2000, and at this time the spherical member 200 only plays a limiting role to prevent the screwdriver bit from slipping out of the socket 110.

[0039] The first elastic member 300 of this embodiment is mounted on the working shaft 100, one end of the first elastic member 300 is connected to the working shaft 100, and the other end is against the spherical member 200. The first elastic member 300 may be a spring. When the spherical member 200 is located at one end of the waist-shaped hole 120 close to the opening 111 of the plug hole 110, the first elastic member 300 may be compressed or in a state of no force. When the spherical member 200 moves from one end of the waist-shaped hole 120 close to the opening 111 of the plug hole 110 to one end away from the opening 111 of the plug hole 110, the first elastic member 300 is compressed.

[0040] According to the above-mentioned screwdriver bit installation mechanism of this embodiment, a waist-shaped hole 120 is provided on the side wall of the socket 110. When a screwdriver bit with a shorter tail end is inserted into the socket 110, the spherical member 200 can move in the waist-shaped hole 120, so that the tail end of the screwdriver bit can be against the tail end of the socket 110, and the screwdriver bit is axially supported, thereby reducing the squeezing force between the spherical member 200 and the screwdriver bit annular groove during impact operation, preventing the two from sticking together and avoiding affecting the subsequent removal of the screwdriver bit. In addition, after the current screwdriver bit is removed, the spherical member 200 can be reset to the initial position by the elastic member, which is conducive to the spherical member 200 falling into the annular groove of the screwdriver bit when the subsequent screwdriver bit is inserted, and is convenient for the assembly of the subsequent screwdriver bit.

[0041] In order to improve the stability of the spherical component 200 in the waist-shaped hole 120 so that the spherical component 200 can only move along the length direction of the waist-shaped hole 120 , it is necessary to limit the spherical component 200 in the radial direction of the waist-shaped hole 120 .

[0042] In some examples, the structure of the waist-shaped hole 120 can be improved. In the direction perpendicular to the axial direction of the working shaft 100, the waist-shaped hole 120 has two opposite side walls, one of the two side walls is provided with a limiting structure (not shown in the figure), or both side walls are provided with a limiting structure, and the limiting structure is used to prevent the spherical member 200 from entering the socket 110 through the waist-shaped hole 120.

[0043] Optionally, the limiting structure can be a limiting wall extending from one side of the side wall adjacent to the insertion hole 110 to the other side wall, the length direction of the limiting wall is consistent with the length direction of the waist-shaped hole 120, and the length of the limiting wall is less than or equal to the length of the waist-shaped hole 120.

[0044] In addition, the bit installation mechanism of this embodiment can also be designed to include a locking sleeve assembly 400 , which is sleeved on the working shaft 100 and is used to prevent the spherical member 200 from escaping from the waist-shaped hole 120 in a direction away from the insertion hole 110 .

[0045] In some examples, the locking sleeve assembly 400 of this embodiment includes a locking sleeve body 410 and a first retaining spring 420. The locking sleeve body 410 of this embodiment is sleeved on the working shaft 100 and covers the waist-shaped hole 120. The shape of the locking sleeve body 410 can be a cylindrical or annular structure.

[0046] The first retaining spring 420 of this embodiment is sleeved on the working shaft 100 and abuts against the end of the lock sleeve body 410 away from the opening 111 of the insertion hole 110. Specifically, the first retaining spring 420 is fixed on the working shaft 100, so that the end of the lock sleeve body 410 away from the opening 111 of the insertion hole 110 can be limited on the working shaft 100 to prevent the lock sleeve body 410 from moving in a direction away from the opening 111 of the insertion hole 110.

[0047] In some examples, optionally, the inner wall surface of the lock sleeve body 410 of this embodiment is provided with a retaining wall 411 extending toward the waist-shaped hole 120, and the retaining wall 411 is located at one end of the waist-shaped hole 120 close to the opening 111 of the plug hole 110. When the spherical member 200 is located at one end of the waist-shaped hole 120 close to the opening 111 of the plug hole 110, the retaining wall 411 is clearance-matched with the spherical member 200. When installing a screwdriver with a longer tail end such as a double screwdriver 1000, the clearance-matching between the retaining wall 411 and the spherical member 200 can ensure the radial limitation of the spherical member 200, and the retaining wall 411 also serves as a connecting structure of the elastic limiting assembly 500 described below, and has multiple uses in one body.

[0048] In some examples, optionally, the retaining wall 411 of this embodiment has an annular inclined surface 4111, the radial dimension of which gradually decreases in the direction away from the T-shaped tail end 112, and the inclined surface 4111 plays a certain guiding role when the steel ball moves toward the T-shaped tail end 112.

[0049] In order to provide a buffer when the bit is pulled out and to limit the lock sleeve assembly 400 of this embodiment at the same time, the bit installation mechanism of this embodiment also includes an elastic limiting assembly 500; the elastic limiting assembly 500 is sleeved on the working shaft 100 and connected to the lock sleeve assembly 400; the elastic limiting assembly 500 is used to limit the lock sleeve assembly 400 to move toward the opening 111 close to the socket 110.

[0050] In some examples, optionally, the elastic limit assembly 500 of this embodiment includes a second retaining spring 510 and a second elastic member 520. The second retaining spring 510 is mounted on one end of the working shaft 100 where the insertion hole 110 is opened, and is fixedly connected to the working shaft 100. The second elastic member 520 can also be a spring, which is mounted on the working shaft 100 and located in the lock sleeve assembly 400. One end of the second elastic member 520 is connected to the lock sleeve assembly 400, and the other end of the second elastic member 520 is connected to the second retaining spring 510. The second elastic member 520 can be connected to the lock sleeve assembly 400 and the second retaining spring 510 by abutment.

[0051] When the screwdriver bit is pulled out, the screwdriver bit makes the spherical part 200 be located at one end of the waist-shaped hole 120 close to the opening 111 of the socket 110, and when the spherical part 200 is separated from the annular groove of the screwdriver bit, the spherical part 200 can abut against the retaining wall 411 of the locking sleeve body 410, driving the locking sleeve body 410 to compress the second elastic part 520. Since the second elastic part 520 is limited by the retaining spring, it can achieve buffering when the screwdriver bit is pulled out.

[0052] Optionally, the elastic limiting assembly 500 of this embodiment may further include a washer 530, which is mounted on the working shaft 100, and is located between the second elastic member 520 and the second retaining spring 510, and is respectively connected to the second elastic member 520 and the second retaining spring 510. The washer 530 can improve the stability of the connection between the retaining spring and the working shaft 100.

[0053] In addition, combined with Figure 5 As shown in the figure, an annular recess 130 can also be set on the working shaft 100 of this embodiment to form a stepped cylindrical surface. The annular recess 130 is set corresponding to the spherical part 200. The axial length of the waist-shaped hole 120 is greater than the axial length of the annular recess 130. The annular recess 130 can reduce the radial dimension of the working shaft 100 after the spherical part 200 is installed.

[0054] The following describes the specific structural form of the screwdriver bit installation mechanism of this embodiment when assembling screwdriver bits of different specifications:

[0055] Combined with Figure 3 As shown in the figure, when the double screwdriver bit 1000 is inserted into the socket 110, since the tail end of the double screwdriver bit 1000 is longer, it can directly abut against the T-shaped tail end 112 of the socket 110. At this time, the spherical member 200 of this embodiment is located at one end of the waist-shaped hole 120 close to the opening 111 of the socket 110, and is partially located in the first annular groove 1100 of the double screwdriver bit 1000. The spherical member 200 serves as a limiting structure of the double screwdriver bit 1000, which can prevent the double screwdriver bit 1000 from falling out of the socket 110 when rotating.

[0056] Combined with Figure 4 As shown in the figure, when the single screwdriver bit 2000 is inserted into the socket 110, part of the spherical member 200 can be located in the second annular groove 2100 of the single screwdriver bit 2000. Since the tail end of the single screwdriver bit 2000 does not have a screw hole, the tail end length is relatively short. When the single screwdriver bit 2000 receives an external force or impact, the spherical member 200 can be driven to move away from the opening 111 of the socket 110, so that the waist-shaped hole 120 close to the socket 110 The spherical piece 200 at one end of the opening 111 moves to the end of the waist-shaped hole 120 away from the opening 111 of the socket 110, so that the T-shaped tail end 112 of the socket 110 can support the single screwdriver bit 2000, avoiding the spherical piece 200 from serving as the main support of the single screwdriver bit 2000 in the axial direction. At this time, the spherical piece 200 also serves as a limiting structure of the double screwdriver bit 1000, which can prevent the single screwdriver bit 2000 from falling out of the socket 110 when rotating.

[0057] Based on the above-mentioned bit installation mechanism, the present embodiment proposes an impact screwdriver having a bit installation mechanism as the above-mentioned technical solution. For the structure of other parts of the impact screwdriver, please refer to the prior art, and this application will not elaborate on them.

[0058] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A screwdriver bit installation mechanism, characterized in that: include: A working shaft, one end of which is provided with a plug hole arranged axially in the length direction, and a side wall of the plug hole is provided with a waist-shaped hole arranged axially in the length direction; A spherical member, which is axially movable and installed in the waist-shaped hole, and is used for limiting cooperation with a screwdriver bit inserted in the socket; and A first elastic member, wherein the first elastic member is sleeved on the working shaft, one end of the first elastic member is connected to the working shaft, and the other end of the first elastic member is against the spherical member.

2. The bit installation mechanism according to claim 1, characterized in that: The spherical member moves from one end of the waist-shaped hole close to the opening of the inserting hole to the other end away from the opening of the inserting hole, and the first elastic member is compressed.

3. The bit installation mechanism according to claim 1, characterized in that: In a direction perpendicular to the axial direction of the working axis, the waist-shaped hole has two opposite side walls, at least one of the two side walls is provided with a limiting structure, and the limiting structure is used to prevent the spherical part from entering the insertion hole from the waist-shaped hole.

4. The bit installation mechanism according to claim 1, characterized in that: The bit installation mechanism also includes a locking sleeve assembly, which is sleeved on the working shaft and is used to prevent the spherical part from escaping from the waist-shaped hole in a direction away from the insertion hole.

5. The bit installation mechanism according to claim 4, characterized in that: The lock sleeve assembly comprises a lock sleeve body and a first retaining spring; The locking sleeve body is sleeved on the working shaft and covers the waist-shaped hole; The first clamping spring is sleeved on the working shaft and abuts against an end of the locking sleeve body which is away from the opening of the insertion hole.

6. The bit installation mechanism according to claim 5, characterized in that: The inner wall surface of the lock sleeve body is provided with a retaining wall extending toward the waist-shaped hole, and the retaining wall is located at one end of the waist-shaped hole close to the opening of the insertion hole; When the spherical component is located at one end of the waist-shaped hole close to the opening of the inserting hole, the retaining wall and the spherical component are clearance-matched.

7. The bit installation mechanism according to any one of claims 4 to 6, characterized in that: The bit installation mechanism further comprises an elastic limiting assembly, which is sleeved on the working shaft and connected to the locking sleeve assembly, and is used for limiting the locking sleeve assembly to move toward an opening close to the jack.

8. The bit mounting mechanism according to claim 7, characterized in that: The elastic limiting assembly includes a second retaining spring and a second elastic member, the second retaining spring is sleeved on one end of the working shaft where the insertion hole is opened, the second elastic member is sleeved on the working shaft and located in the locking sleeve assembly, and the second elastic member is respectively connected to the locking sleeve assembly and the second retaining spring.

9. The bit installation mechanism according to claim 8, characterized in that: The elastic limiting assembly also includes a washer, which is sleeved on the working shaft, located between the second elastic member and the second retaining spring, and connected to the second elastic member and the second retaining spring respectively.

10. An impact screwdriver, characterized in that: It comprises a bit mounting mechanism as described in any one of claims 1 to 9.

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