Bit placement mechanism and screwdriver

Abstract

According to the technical scheme, the screwdriver head placement mechanism comprises an output shaft, a transmission shaft, a driving mechanism and a driving mechanism, and the output shaft is used for transmitting power; the anvil block is arranged on the output shaft; the mounting hole is formed in the axis of the end part of the output shaft; the strip groove is formed in the peripheral wall of the output shaft and communicated with the mounting hole, and the strip groove is provided with a first position and a second position; the ball is arranged in the strip groove and can be switched between the first position and the second position; the sliding sleeve is arranged on the output shaft in a sleeving manner, at least partially covers the strip groove and is provided with a limiting part; the limiting piece is arranged on the side, close to the anvil block, of the limiting part and at least partially covers the first position, and the limiting piece can only deform in the radial direction of the output shaft; the fixing piece is connected to the end, away from the anvil block, of the output shaft. The reset piece is arranged between the limiting part and the fixing piece and has the trend of pushing the limiting part to the second position; therefore, the screwdriver head is convenient to disassemble.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric tools, in particular to a bit setting mechanism and a screwdriver. BACKGROUND

[0002] The working principle of the impact screwdriver is to drive the impact head by the motor to generate high-frequency vibration, and then transmit the power to the screws, nuts and other parts, so as to loosen or tighten them. At the same time, the chuck can hold the parts to make them fixed, so as to facilitate disassembly and installation. This high-frequency vibration and impact force makes the impact screwdriver can easily cope with high-strength working conditions, such as tightening large bolts or screwing screws on hard wood.

[0003] In the related art, a Chinese patent with publication number CN1349447A discloses a knife holder, which includes a quick connection mechanism actuated by inserting a single or double knife, and a knife engagement device that forces a fixing device to displace, so that the fixing device actuates the knife engagement device, and the knife engagement device is released when the fixing device is operated by hand, so that the knife is pushed out of the knife holder, and the user can operate the knife holder with only one hand.

[0004] However, the current bit clamping method needs to manually operate the setting mechanism to complete the installation of the bit during the working process of the bit, which is low in installation efficiency, and needs to be improved. SUMMARY

[0005] Therefore, it is necessary to provide a bit setting mechanism and a screwdriver to solve the problem of low bit installation efficiency.

[0006] To solve the above technical problems, the present application is implemented as follows:

[0007] In one embodiment, a bit setting mechanism is provided, which includes:

[0008] An output shaft for transmitting power;

[0009] An anvil arranged on the output shaft;

[0010] A mounting hole arranged at the end of the output shaft;

[0011] A strip groove arranged on the peripheral wall of the output shaft and communicated with the mounting hole, the strip groove having a first position and a second position;

[0012] A ball arranged in the strip groove and switchable between the first position and the second position;

[0013] A sliding sleeve sleeved on the output shaft and at least partially covering the strip groove and having a limiting portion;

[0014] A limiting member is arranged on the side of the limiting portion close to the anvil and at least partially covers the first position, and the limiting member can only be radially deformed along the output shaft;

[0015] A fixing member is connected to the end of the output shaft away from the anvil;

[0016] A resetting member is arranged between the limiting portion and the fixing member and has a tendency to push the limiting portion to the second position.

[0017] Optionally, a limiting portion is arranged on the side of the slot close to the mounting hole to limit the depth of the ball entering the mounting hole.

[0018] Optionally, the limiting member is a radial spring.

[0019] Optionally, the distance of the radial deformation of the radial spring along the output shaft is greater than or equal to the depth of the ball entering the mounting hole.

[0020] Optionally, the intercept of the radial spring is equal to the diameter of the radial spring.

[0021] Optionally, the force of the radial deformation of the radial spring is at least 4N.

[0022] Optionally, the wire diameter of the radial spring is [0.3mm, 1.5mm].

[0023] Optionally, the side of the limiting portion facing the limiting member is provided with a push-out surface, and the distance of the push-out surface from the side surface of the limiting portion facing the fixing member decreases from the inner wall of the sleeve to the center of the sleeve.

[0024] Optionally, the mounting hole is used to mount a bit, and the force of the bit mounted into the mounting hole is [2N, 10N].

[0025] On the other hand, based on the same inventive concept, the present application also discloses a screwdriver for driving a tool accessory, comprising:

[0026] A housing;

[0027] A power source is at least partially accommodated in the housing;

[0028] A transmission mechanism is connected to the power source to receive the power of the power source;

[0029] An impact mechanism is connected to the transmission mechanism and outputs a striking force;

[0030] The bit mounting mechanism as described in any of the above embodiments, the output shaft receives the striking force of the impact mechanism and transmits the striking force to the tool accessory.

[0031] In the embodiment of the present application, the radial position of the ball is limited when the ball slides to the first position through the setting of the limiting piece, thereby facilitating the installation of the chuck. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A structure sectional view of a chuck setting mechanism in an embodiment of the present application;

[0033] Figure 2 A structure sectional view of a chuck setting mechanism in an embodiment of the present application; Figure 1 An enlarged view of the structure at A in FIG. 4;

[0034] Figure 3 A structure sectional view of a chuck setting mechanism in an embodiment of the present application;

[0035] Figure 4 A main structure view of a screwdriver in an embodiment of the present application.

[0036] Fig. 1 is a structure sectional view of a screwdriver in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the above objectives, features and advantages of the present application more apparent, the following will be combined with the accompanying drawings to give a detailed description of the present application. Figures 1-4 The specific embodiments of the present application will be described in detail in the following. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0038] 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" and the like 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, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0039] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Thus, the technical features defined with "first", "second" can explicitly or implicitly include at least one of the technical features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0040] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0042] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes, and are not the only embodiment.

[0043] Reference Figure 1 and Figure 2, Fig. 1 shows a schematic view of the structure of the head setting mechanism in an embodiment of the present application, Fig. 2 shows a schematic view of the structure of the head setting mechanism in an embodiment of the present application, and Fig. 3 shows a schematic view of the structure of the head setting mechanism in an embodiment of the present application. The head setting mechanism comprises an output shaft 1, an anvil 11, a mounting hole 12, a slot 13, a ball 2, a sliding sleeve 3, a limiting part 4, a fixing part 5 and a resetting part 6. The output shaft 1 can be made of metal and has a cylindrical shape. The anvil 11 can be integrally formed at one end of the output shaft 1. The anvil 11 can be symmetrically arranged along the radial direction of the output shaft 1. The mounting hole 12 can be arranged at the end of the output shaft 1 away from the anvil 11, and the mounting hole 12 can be located at the center of the output shaft 1. The anvil 11 is used to receive the impact force from the striking mechanism and transmit the impact force to the head installed in the mounting hole 12 at the front end of the output shaft 1.

[0044] The slot 13 is arranged at the end of the output shaft 1 and communicates with the mounting hole 12. The slot 13 extends along the length direction of the output shaft 1 and communicates with the mounting hole 12 along the radial direction of the output shaft 1. The side of the slot 13 close to the mounting hole 12 can be provided with a limiting part 131. The limiting part 131 protrudes towards the center of the slot 13, and the limiting part 131 can smoothly transition from the inside of the slot 13. The transition surface between the limiting part 131 and the slot 13 can be an inclined surface or an arc surface. In the embodiment of the present application, the transition surface is preferably an arc surface.

[0045] The slot 13 can have a first position and a second position. The ball 2 is installed in the slot 13 and can be limited by the limiting part 131, thereby limiting the position of the ball 2 entering the mounting hole 12. The ball 2 can slide between the first position and the second position, and thus can switch between the first position and the second position.

[0046] Referring to Figure 2 and Figure 3 , Fig. 3 shows a schematic view of the structure of the head setting mechanism in an embodiment of the present application. The sliding sleeve 3 can be made of metal and has a cylindrical shape. The sliding sleeve 3 can be sleeved outside the slot 13 at the end of the output shaft 1 away from the anvil 11 and at least partially cover the slot 13. The inner wall of the sliding sleeve 3 can form a limiting part 31. The limiting part 31 is used to limit the position of the ball 2. During the sliding process of the sliding sleeve 3, the limiting part 31 switches between the second position and the outer wall of the output shaft 1. When the limiting part 31 is at the second position, the limiting part 31 limits the ball 2. When the limiting part 31 is at the outer wall of the output shaft 1, the limiting part 31 is out of limiting the ball 2.

[0047] The limiting part 31 can be provided with a limiting member 4 on the side close to the anvil 11, the limiting member 4 covers at least the first position and the limiting member 4 can only deform along the radial direction of the output shaft 1. The limiting member 4 can limit the position of the ball 2 moving along the radial direction of the output shaft 1. The fixing member 5 can be connected to the end of the output shaft 1 away from the anvil 11, the fixing member 5 can be mounted on the output shaft 1 and used to limit the position of the sliding sleeve 3. Specifically, in the embodiment of the application, the fixing member 5 can be a snap ring, a circlip or other axial fixing member.

[0048] The resetting member 6 can be arranged between the limiting part 31 and the fixing member 5, preferably, the resetting member 6 can be clamped between the limiting part 31 and the fixing member 5, the resetting member 6 can be an elastic member such as a spring, and the resetting member 6 has a tendency to push the limiting part 31 to the second position. The resetting member 6 is located between the fixing member 5 and the limiting part 31, so as to push the sliding sleeve 3 towards the anvil 11.

[0049] In some preferable embodiments, the limiting member 4 can be a radial spring, the radial spring can be a special form of spring, the intercept of the radial spring can be equal to the diameter of the radial spring, that is, the adjacent two turns of the radial spring are in close contact and there is no gap. Since the radial spring is formed by bending a steel wire, it has the ability of elastic deformation, and when it is subjected to force, the radial spring can only deform along the radial direction.

[0050] In some preferable embodiments, the distance of the radial deformation of the radial spring along the output shaft 1 is greater than or equal to the depth of the ball 2 entering the mounting hole 12. Due to the existence of the strip groove 13, the ball 2 can be accommodated into the strip groove 13, and when the ball 2 is subjected to force and moves outward along the radial direction of the output shaft 1, the ball 2 will extrude the radial spring and cause the radial spring to deform. When the distance of the radial deformation of the radial spring along the output shaft 1 is greater than or equal to the depth of the ball 2 entering the mounting hole 12, the ball 2 can completely leave the strip groove 13, so that the chuck can be easily taken out.

[0051] In some preferable embodiments, in order to position the chuck by keeping the ball 2 in the strip groove 13 and facilitate the insertion of the chuck, the force of the radial deformation of the radial spring is at least 4N, specifically, the force of the radial deformation of the radial spring is [6N, 15N], particularly, the force of the radial deformation of the radial spring is 7N, 8N, 9N or 10N.

[0052] In some preferable embodiments, the wire diameter of the radial spring is [0.3mm, 1.5mm], preferably, the wire diameter of the radial spring is 0.7mm, more preferably, the wire diameter of the radial spring is 0.6mm, or 0.5mm, at this time, the spring force of the radial spring makes the feeling of installing the chuck better.

[0053] In some preferable embodiments, the limiting part 31 is provided with a pushing surface 311 on the side facing the limiting member 4, the distance from the pushing surface 311 to the side surface of the limiting part 31 facing the fixing member 5 decreases from the inner wall of the sleeve 3 to the center of the sleeve 3, thereby guiding the moving direction of the ball 2. In particular, the pushing surface 311 can be an inclined surface or an arc surface.

[0054] In some preferable embodiments, the mounting hole 12 is used for mounting the bit, the force required for mounting the bit into the mounting hole 12 is [2N, 10N], in particular, when the wire diameter of the radial variable spring is 0.7mm, the force required for mounting the bit into the mounting hole 12 is 8N, preferably, at this time, the bit is mounted with a better feel.

[0055] Referring to Figure 4 , FIG. 4 shows a schematic diagram of the main structure of the screwdriver machine in an embodiment of the present application, the present application also discloses a screwdriver machine for driving a tool accessory, the tool accessory herein is a bit, the above-mentioned screwdriver machine comprises a housing 7, a power source 71, a transmission mechanism 72, an impact mechanism 73 and the bit mounting mechanism mentioned in any of the above embodiments. Among them, the power source 71 is at least partially accommodated in the housing 7. In some preferable embodiments, the power source 71 can be a motor.

[0056] The transmission mechanism 72 is accommodated in the housing 7 and connected to the power source 71 to receive the power of the power source 71, the impact mechanism 73 is connected to the transmission mechanism 72 and outputs the impact force to the bit mounting mechanism, the output shaft 1 receives the impact force of the impact mechanism 73 and transmits the impact force to the tool accessory, so that the tool accessory can rotate and impact in the circumferential direction. In particular, the tool accessory in the embodiment of the present application is a bit.

[0057] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the present application.

[0058] The above-mentioned embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which 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 chuck setting mechanism characterized by comprising: The utility model relates to a tool bit installation mechanism, comprising: an output shaft for transmitting power; an anvil disposed on the output shaft; a mounting hole formed in the end of the output shaft; a slot formed in the peripheral wall of the output shaft and communicating with the mounting hole, the slot having a first position and a second position; a ball disposed in the slot and switchable between the first position and the second position; a sliding sleeve sleeved on the output shaft and at least partially covering the slot and having a limiting portion; a limiting member disposed on the side of the limiting portion close to the anvil and at least partially covering the first position, the limiting member being capable of deforming only radially along the output shaft; a fixing member connected to the end of the output shaft away from the anvil; a reset member disposed between the limiting portion and the fixing member and having a tendency to push the limiting portion to the second position; the limiting member is a radial spring, the distance of the radial deformation of the radial spring along the output shaft is greater than or equal to the depth of the ball entering the mounting hole, and the intercept of the radial spring is equal to the diameter of the radial spring.

2. The bit setting mechanism according to claim 1, wherein The side of the slot close to the mounting hole is provided with a limiting portion for limiting the depth of the ball entering the mounting hole.

3. The bit setting mechanism according to claim 1, wherein The force of the radial deformation of the radial spring is at least 4N.

4. The bit setting mechanism according to claim 3, wherein The wire diameter of the radial spring is [0.3mm, 1.5mm].

5. The bit setting mechanism according to claim 1, wherein The side of the limiting portion facing the limiting member is provided with a push-out surface, the distance of the push-out surface from the side surface of the limiting portion facing the fixing member decreases from the inner wall of the sliding sleeve to the center of the sliding sleeve.

6. The bit setting mechanism according to claim 1, wherein The mounting hole is used for installing a tool bit, and the force of the tool bit installed into the mounting hole is [2N, 10N].

7. A screwdriver machine characterized by A tool accessory for driving, comprising: a housing; a power source at least partially accommodated in the housing; a transmission mechanism connected to the power source to receive power from the power source; an impact mechanism connected to the transmission mechanism and outputting a striking force; the tool bit installation mechanism according to any one of claims 1-6, the output shaft receiving the striking force of the impact mechanism and transmitting the striking force to the tool accessory.

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