WO2014146506A1

WO2014146506A1 - Electric power tool

Info

Publication number: WO2014146506A1
Application number: PCT/CN2014/070693
Authority: WO
Inventors: 黄永林; 王卫
Original assignee: 宁波市海联电器有限公司
Priority date: 2013-11-20
Filing date: 2014-01-16
Publication date: 2014-09-25

Abstract

An electric power tool comprising a motor housing (1), a motor (2), a transmission device (3), a tool engagement head (4) and a drum-type tool magazine (5), wherein a tool compartment (5.5) within the drum-type tool magazine (5) can, each time, be adjusted to a position such that a tool within the tool compartment (5.5) is transferred to the tool engagement head (4); the drive shaft (3.3) of said transmission device (3) is provided on the outside of the drum-type tool magazine (5), and the drum-type tool magazine (5) is rotatively connected to the machine housing (1). The drum-type tool magazine of the electric power tool can be unscrewed without disassembling the machine housing, thus simplifying the process of exchanging tools in the tool compartment.

Description

Power tools

The present invention relates to a hand-held electric tool having a drum type tool magazine and capable of rotating a tool magazine to change a tool.

Background technique

Chinese Patent Application Publication No. CN101563192 discloses an electric tool with a drum type tool magazine. The power tool has a pistol-shaped casing, and has a main axis extending in the direction of the barrel. The power tool output shaft is at the exit of the barrel direction, and is a cutter chuck. The casing is provided with a motor and a drum type tool magazine. The transmission device and the drum type tool magazine have a cylindrical structure, and the axis of the drum type tool magazine and the axis of the tool chuck are parallel to the main axis, and the drum type tool magazine has a tool chamber which is parallel to the main axis in a ring shape on itself, and these tool chambers Respecting the overlapping position with the tool chuck according to the rotational position of the drum magazine, respectively, in which the corresponding tool can be transferred between the tool chamber and the tool chuck, the transfer is in the chuck with the tool Coaxial, realized by an actuator in the form of an operating slide guided on the outside of the housing. The drum type tool magazine is also formed on the housing, and the drum type tool magazine is penetrated by the transmission shaft of the transmission device in the central region surrounded by the tool chamber, and the rotation shaft passes through the tool magazine and is drivenly connected to the cutter chuck through the gear , can drive the cutter head to rotate.

If the power tool with this structure is to be replaced with a tool in the tool magazine, the entire tool magazine needs to be removed, which requires disassembly of the entire casing, which is very inconvenient.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a power tool that is simple and convenient to replace the tool in the tool magazine.

In order to solve the above technical problem, the present invention provides a power tool including a casing, a motor, a transmission, a tool chuck, and a drum type tool magazine, wherein the tool chamber in the drum type tool magazine can be adjusted to one at a time. The tool in the tool chamber is transferred to the position of the tool chuck, and the transmission shaft of the transmission is disposed outside the drum magazine, and the drum magazine is rotatably connected to the casing.

The transmission device is drivingly coupled to the motor, the transmission device includes a gearbox, a first gear set, a drive shaft, and a second gear set. The output shaft of the motor is coupled to the transmission, and the output shaft of the transmission is connected through the first gear set. The drive shaft is disposed outside the drum cutter magazine, and the other end of the drive shaft is coupled to the cutter chuck through the second gear set for driving the cutter chuck to rotate. When the power tool is started, the motor drives the output shaft of the transmission to rotate, and drives the cutter head through the transmission shaft and the first gear set and the second gear set to complete the action of the power tool.

The drum type tool magazine comprises a roller coaxial with the drum type tool magazine and a roller bracket for mounting the roller, wherein the casing is provided with a support seat, and the roller bracket is rotatably connected in the support base, and the plane of the rotation track is Vertical to the axis of the roller.

One of the embodiments is that the support base is further provided with an arc groove for guiding and guiding the roller bracket, and the roller bracket is provided with a first portion with a first ball matched with the arc groove. When the roller bracket rotates, the first ball slides in the arc groove, and both ends of the arc groove are provided with positioning grooves for limiting, and the depth and width of the positioning groove are larger than the arc groove. With this structure, the roller bracket is guided and restricted when the roller bracket rotates, and when the first ball slides to the position of the positioning groove at both ends of the arc groove, the depth and the width of the positioning groove are larger than the arc groove, and Due to the elasticity of the first spring, the first ball is caught in the positioning groove, so that the rotation angle and the stroke of the roller bracket are restricted, and the position of the arc groove is guided by the arc groove. Therefore, the roller bracket is rotated slightly, and the roller bracket rotates within the range of the arc groove. Limiting both ends of the arc groove is to prevent the excessive force from damaging the roller bracket when the roller bracket is screwed out, and to play the role of positioning when the roller bracket is reset.

The second embodiment is as follows: the roller bracket is provided with a sleeve, and the sleeve includes inner and outer tubes that are sleeved relative to each other, and the outer tube serves as a rotating shaft for rotating the roller bracket, and the inner tube is sleeved on the electric On the drive shaft of the tool, the drive shaft can be rotated in the inner tube, and the inner tube is connected as a support base to the casing of the electric tool to fix the inner tube and support the transmission shaft. After adopting the above structure, the casing and the transmission shaft are organically linked, and it is not necessary to avoid the transmission shaft to set the bracket, thereby avoiding the problem that the power tool structure becomes large due to the contradiction between the transmission shaft and the bracket, and realizes a problem. The compact structure design is also convenient to use, so it has the advantages of compact structure and convenient use.

As an improvement, the outer surface of the inner tube is provided with a first radial protrusion, and the first radial convex front surface is provided with two spherical depressions, and the two spherical depressions are distributed along the circumferential direction of the outer tube; There is a second radial protrusion, and a rear side of the second radial protrusion is provided with a steel ball axially supported by the elastic member, and the steel ball is matched with the spherical recess according to the rotation position of the bracket, so that the two spheres The recess provides two anchor points, ie the bracket The initial positional positioning and the positioning of the bracket out of position are more conducive to the improvement of performance, and the user is more convenient to use. As a modification, the first radial projection is a fan-shaped projection, which is more advantageous for compactness.

The roller of the drum type tool magazine is provided with a tool chamber, the center of the roller is provided with an axial shaft hole, and the roller bracket is provided with a shaft connected to the roller through the shaft hole, and the shaft is vertically disposed a second spring in the axial direction, a second ball is connected to both ends of the second spring, and a circumference of the shaft hole is provided with a card slot corresponding to the number of the tool chambers, the second ball and the card Slot fit. The bottom surface of the card slot is a curved surface for accommodating the second ball. When the roller is rotated on the roller bracket, the rotation of the card slot and the second ball can be used to drive a fixed angle for each rotation, so that the tools in the tool magazine of each rotation position are corresponding to the tool chuck, Deviations can occur, making the tool access to the tool magazine very smooth.

After adopting the above structure, the present invention has the following advantages: The present invention sets the transmission shaft of the transmission device to the outside of the drum type tool magazine, instead of passing through the drum type tool magazine, and can also rotate the drum type tool magazine to the casing. Therefore, the drum type tool magazine can be unscrewed without disassembling the boot casing, so that the tool in the tool magazine can be replaced, and then directly screwed into the casing for replacement, which is simple and convenient, so that the electric tool can carry the tool. The variety of types, such as various screwdriver bits, drill bits, etc., greatly expands the range of use of the power tool.

The power tool further includes a push rod for pushing the tool to the position of the tool chuck; and a push rod block that is rotatably coupled to the transmission and whose plane of rotation is perpendicular to the axis of the push rod The pusher bar is further provided with an elastic reset mechanism. In the natural state, the pusher bar is directly opposite the pusher and abuts against the rear end face of the pusher. When the elastic reset mechanism is in the state of accumulating force, the push bar is blocked. The piece rotates to be offset to the side, deviating from the position of the push rod movement;

The push rod is further provided with a push rod connecting piece and a push rod button, wherein the push rod is provided with a first protrusion, the push rod connecting piece is provided with a long hole, and the first protrusion of the push rod slides Fitted in the long hole, the push rod button is connected with the push rod connecting piece, and is used for pushing the push rod connecting piece and the push rod to move axially;

The top end of the pusher bar is provided with a cylindrical second protrusion, and the pusher connecting piece is provided with a third protrusion which can move against the second protrusion when moving to rotate the pusher block. With the above structure, the present invention has the following advantages: When the power tool is in operation, the elastic return mechanism is in a natural state, and at this time, the rear end surface of the push rod is opposed to the push rod stopper, so that the tool of the power tool can be prevented from moving backward.

When the tool is changed, the push button is pushed backward to drive the pusher link to move backward, so that the third protrusion on the pusher link pushes the second protrusion on the pusher block, thereby rotating the pusher block Let out It is convenient to push the push rod backwards freely, and the elastic reset mechanism is in the state of accumulating force.

Moreover, the push rod connecting piece is provided with a long hole, and the first protrusion on the push rod can slide in the long hole, so that at the beginning, the first protrusion is at the rear end of the long hole, and when the push rod connecting piece moves backward, Since the first protrusion slides in the long hole, the push rod does not move. At this time, the push rod connecting piece has moved backward to rotate the push rod block to the side, until the push rod block is completely retracted, that is, there is no When the rear end face of the push rod is pressed again, the first protrusion slides to the front end of the long hole and abuts against the front end of the long hole, so that the push rod connecting piece can just move the push rod backward. This prevents the pusher from moving out when moving backwards.

Preferably, the elastic return mechanism is a tension spring, and one end of the tension spring is connected to the driving unit, and the other end is connected to the push rod blocking piece. The tension spring is used as the elastic reset mechanism, and the structure is simple and the cost is low. DRAWINGS

Figure 1 is a schematic cross-sectional view of the present invention;

2 is a schematic structural view of a rotary state of a drum type tool magazine according to the present invention;

Figure 3 is a schematic structural view showing the state in which the drum type tool magazine is screwed in the present invention;

4 is a schematic view showing a mounting structure of a roller bracket according to an embodiment of the present invention;

Figure 5 is a schematic view showing the installation structure when the roller bracket is screwed out;

Figure 6 is an enlarged schematic view of a portion A of Figure 5;

Figure 7 is a cross-sectional view taken along line C-C of Figure 6;

Figure 8 is a schematic view showing the installation structure of the roller and the roller bracket;

Figure 9 is a cross-sectional view showing the installation of the roller and the roller bracket;

Figure 10 is a schematic axial cross-sectional view of the electric power tool of the second embodiment;

Figure 11 is a cross-sectional view taken along line A-A of Figure 10;

Figure 12 is a cross-sectional view showing the C-C of Figure 10 in an initial position;

Figure 13 is a cross-sectional view of the C-C bracket of Figure 10 when it is rotated out of position;

Figure 14 is a schematic structural view of a push rod assembly when the power tool of the present invention is in operation;

Figure 15 is a schematic view showing the structure of the push rod assembly of the present invention when pushed backward;

Figure 16 is a schematic view showing the structure of the push rod assembly of the present invention after being pushed backward;

As shown in the figure: 1, the casing, 2, the motor, 3, the transmission, 3. 1, the gearbox, 3. 2, the first gear set, 3. 3, the drive shaft, 3. 4, the second gear set 4, tool chuck, 5, drum type tool magazine, 5. 1, roller, 5. 2, roller bracket, 5. 2. 1, inner tube, 5. 2. 2, outer tube, 5. 2. 3 First radial bulge, 5. 2. 4. Spherical depression, 5. 2. 5, second radial projection, 5. 3, first ball, 5. 4, first spring, 5. 5, tool chamber, 5. 6, shaft hole, 5. 7, Axis, 5. 8, second spring, 5. 9, second ball, 5. 10, card slot, 6, support seat, 6. 1, curved groove, 6. 2, positioning groove, 7, push rod, 8. Pusher block, 9, pusher connecting piece, 10, pusher button, 11, first protrusion, 12, long hole, 13, second protrusion, 14, third protrusion, 15, tension spring .

Specific form

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

One of the embodiments of the electric power tool of the present invention is a pistol type electric screwdriver, and the present invention is exemplified below by taking the electric screw batch as an example:

As shown in Figure 1-9: A power tool, which includes a casing 1, a motor 2, a transmission 3, a cutter chuck 4, and a drum cutter magazine 5, and the casing 1 is a pistol-shaped casing, and the muzzle The cutter head 4 is provided with the cutter chuck 4 to catch the cutter and rotate the cutter. The cutter in the embodiment is a screwdriver head, and the cutter chuck 4 is provided with a drum cutter magazine 5 at the rear of the cutter chuck 4, and the drum cutter magazine is provided. 5, the tool chamber 5. 5 can be adjusted to a position in the tool chamber 5.5 to the position of the tool chuck 4, and the rear of the drum magazine 5 is provided with a push rod 7, a push rod 7 On the same axis as the tool holder 4, and through the tool chamber 5.1 in the drum magazine 5, the tool is pushed into the tool holder 4, and the tool can be moved by a magnet provided at the end of the push rod The drive shaft 3 is disposed in the outer side of the drum type tool magazine 5, and the drive shaft 3. 3 is provided below the drum type tool magazine 5, and may also be provided on the side of the drum type tool magazine 5. In short, not in contact with the drum magazine 5, the tool magazine 5 and the drum 1 is rotatably connected to the housing.

The transmission device 3 is connected to the motor 2, and the transmission device 3 includes a gearbox 3.1, a first gear set 3. 2, a drive shaft 3.3, a second gear set 3.4, an output shaft of the motor 2 and a shifting The drive shaft 3.3 is disposed outside the drum type tool magazine 5, the drive shaft is connected to the drive shaft 3. 3 3. The other end of the 3 is connected to the tool chuck 4 through the second gear set 3.4, and is used to drive the cutter head 4 to rotate. When the power tool is started, the motor drives the output shaft of the transmission to rotate, and drives the cutter head through the transmission shaft and the first gear set and the second gear set to complete the action of the power tool.

The connection with the drive shaft 3.3 is directly connected through the first gear set 3.2, the output shaft of the motor 2 is directly connected through the first gear set 3.2. Drive shaft 3. 3 The other end of the drive shaft 3. 3 is set on the drum. The drive shaft 3. 3 is set on the drum. The outside of the tool magazine 5 is within the scope of the present invention.

The roller-type tool magazine 5 includes a roller 5.1 that is coaxial with the drum-type tool magazine, and a roller bracket 5. 2 for mounting the roller 5.1. The casing 1 is provided with a support base 6, the roller 2 之间的轴。 The support of the support of the support of the support.

s. The roller brackets 5. 2 are provided with arcuate slots 6 for the support of the roller brackets. The first ball 5.3 slides in the arcuate groove 6.1, the arc is slid. 1。 The depth and width of the positioning groove 6.2 is greater than the curved groove 6.1. With this structure, the roller bracket 5.2 is guided and restricted when the roller bracket 5.2 is rotated. When the first ball slides to the position of the positioning groove at both ends of the arcuate groove, the depth and the width of the positioning groove are both Larger than the arcuate groove, and due to the elasticity of the first spring, the first ball is caught in the positioning groove, thus limiting the rotation angle of the roller bracket, and at the position between the two ends of the curved groove, due to the arc The guiding action of the groove, so that the roller bracket is slightly rotated, the roller bracket will rotate within the range of the arc groove. Limiting the ends of the arc groove is to prevent the excessive force from damaging the roller bracket when the roller bracket is screwed out, and to play the role of positioning when the roller bracket is reset.

0, the center of the roller 5.1 is provided with an axial shaft hole 5.6. The first spring is provided with a second spring 5. 8 which is perpendicular to the axial direction. The number of the card slots 5. 10, the number of the same as the number of the tool chambers 5. 5 The two balls 5.9 fit with the card slot 5.10. The bottom surface of the slot 5.10 is a curved surface for receiving the second ball. When the roller is rotated on the roller bracket, the rotation of the card slot and the second ball can be used to drive a fixed angle for each rotation, so that the tools in the tool magazine of each rotation position are corresponding to the tool chuck, Deviations can occur, making the tool access to the tool magazine very smooth.

Figure 2, the sleeve is provided with a sleeve, a sleeve, and the sleeve is provided with a sleeve, a sleeve, and a sleeve. 2的旋转轮。 2. 2 and the outer tube 5. 2. 2, the outer tube 5. 2. 2 as a roller bracket 5. 2 rotating The singularity of the inner tube 5.2.2 can be rotated inside the inner tube 5. 2. 2 with the inner tube 5. 2. 2 with the inner tube 5. 2 and the inside of the inner tube 5. 2 The two of the inner tube 5. 2 are fixed by the support seat 6 provided on the casing 5 to fix the inner tube 5. 2. 2 The end is fixed to the inner tube 5. 2. 2 fixed.

The front and rear directional expressions are as shown in the figure, the inner radial surface of the inner tube 5. 2 is provided with a first radial projection 5. 2, the first radial projection 5. 2 has two front and rear end faces 2 2 circumferentially distributed; 2. 4, circumferentially distributed along the outer tube 5. 2. 2 circumferentially distributed; outer tube 5. The second radial projection 5. 2, the second radial projection 5. 2 has two front and rear end faces, the second radial projection 5. 2 The second rearward surface is provided with a steel ball which is axially supported by the elastic member. The steel ball is respectively matched with the spherical recess 5.2.4 in accordance with the position of the roller support 5.2. In this example, the second radial projection 5. 2. 5, an axial blind hole is placed, a spring is placed in the axial blind hole, the steel ball is pressed into the blind hole and a part of the steel ball is exposed to the blind hole, due to the second radial protrusion 5. 2 The occlusion, spring, and steel ball are not visible in the figure, but do not prevent proper understanding of the technical details.

The first radial projection 5.2.3 is a fan-shaped projection.

14-16 is a schematic structural view of a push rod assembly according to the present invention. The recommended component is a component for transferring a tool between a tool chuck and a tool magazine, and includes a push rod 7 for pushing the tool To the position of the tool chuck; transmission 3,

It also includes a pusher bar 8 that is rotatably coupled to the transmission 3 and has a plane of rotation that is perpendicular to the axis of the push rod 7. In the present embodiment, the transmission 3 includes a gearbox 3. 1, a push rod The baffle 8 is rotatably connected to the gearbox 3.1, the gearbox is a cylindrical structure, the axis of rotation of the pusher baffle 8 is the same as the axis of the gearbox, and the pusher baffle 8 is further provided with an elastic reset mechanism. In the natural state, the pusher bar 8 is directly opposite the pusher 7, and is opposite to the rear end face of the pusher 7. When the elastic return mechanism is in the state of accumulating force, the pusher bar 8 is rotated to be offset to the side, offset The position of the push rod 7 is moved; the spring return mechanism is a tension spring 15 in the embodiment, and the push rod block 8 is provided with a pull hook, one end of the tension spring 15 is hooked on the pull hook, and the other end is fixed to the gearbox 3 . 1 on the outer casing.

The push rod 7 is further provided with a push rod connecting piece 9 and a push rod button 10, wherein the push rod 7 is provided with a first protrusion 11 , and the push rod connecting piece 9 is provided with a long hole 12, The first protrusion 11 of the push rod 7 is slidably fitted in the long hole 12, and the push rod connecting piece 9 can drive the push rod 7 to move back and forth. The push rod button 10 is connected with the push rod connecting piece 9 for pushing the push rod connection. The sheet 9 and the push rod 7 move axially; the push rod button 10 extends The outside of the casing 1 of the power tool is for human driving. The axial movement, that is, the push rod 7 moves back and forth.

The top end of the pusher bar 8 is provided with a cylindrical second protrusion 13 which is provided with a second protrusion 13 for moving the pusher block 8 when moving. The third protrusion 14. Both sides of the third projection 14 are beveled. When the pusher link piece 9 is moved, the side surface abuts against the second projection 13, and the force in the front-rear direction is converted into the force in the side direction, thereby pushing the pusher stopper 8 to rotate.

The end faces of the third protrusions 14 and the joints on both sides are chamfered. With this configuration, the second projection 13 is made smoother and smoother with respect to the movement of the third projection 14.

When the power tool is working, as shown in FIG. 14, the push rod moves forward to the maximum position, at this time, the elastic return mechanism is in a natural state, and the tension spring 15 pulls the push rod stopper 8 to make the push rod stopper 8 and the push rod The rear end faces of 7 are offset, so that the tool of the power tool can be prevented from moving backward.

When the tool is changed, as shown in FIG. 15, the push button is pushed backward to drive the pusher link to move backward, so that the third protrusion 14 on the pusher link 9 pushes the second protrusion on the pusher block. Starting from 13, the pusher flap is rotated laterally to give up the position, so that the push rod 7 is freely pushed backward, and the elastic return mechanism is in the state of accumulating, as shown in Fig. 16, when the push rod 7 continues to push backwards, The push rod 7 abuts against the push rod stopper 8 to prevent the push rod stopper 8 from being reset, so that the push rod can be smoothly moved back and forth.

Moreover, the push rod connecting piece 9 is provided with a long hole 12, and the first protrusion 11 on the push rod 7 can slide in the long hole, so that at the beginning, as shown in FIG. 14, the first protrusion 11 is in the long hole 12 When the push rod connecting piece 9 moves backward, since the first protrusion 11 slides in the long hole 12, the push rod 7 does not move. At this time, the push rod connecting piece 9 has moved backward to make the push rod block The sheet 8 is rotated sideways until the pusher flap 8 is completely retracted, that is, when the rear end surface of the push rod 7 is not again pressed, the first projection 11 slides to the front end of the long hole 12, as shown in FIG. A projection 11 abuts against the front end of the long hole 12, so that the push rod connecting piece 9 can just move the push rod 7 backward. When the push rod 7 is moved backward, a distance of the push rod stopper is reserved, thereby preventing the push rod from being unsmooth when moving backward.

Although the embodiment is an electric screwdriver, the cutter is a batch of an electric screwdriver, but the power tool can be configured according to different types of tools in the tool magazine, such as an electric wrench, an electric drill, etc. The structure according to the present invention is also within the scope of the present invention.

Claims

claims

1. An electric tool, which includes a casing (1), a motor (2), a transmission device (3), a tool chuck (4), and a drum-type tool magazine (5). The drum-type tool magazine (5) The tool chamber (5.5) in the tool chamber (5.5) can be adjusted to a position that can transfer the tools in the tool chamber (5.5) to the tool chuck (4). It is characterized by: the transmission shaft (3) of the transmission device (3) 3.3) Located outside the drum-type tool magazine (5), the drum-type tool magazine (5) is rotationally connected to the casing (1).

2. The electric tool according to claim 1, characterized in that: the transmission device (3) is drivingly connected to the motor (2), and the transmission device (3) includes a gearbox (3.1) and a first gear set (3.2) , transmission shaft (3.3), second gear set (3.4), the output shaft of the motor (2) is connected to the gearbox (3.1), and the output shaft of the gearbox (3.1) is connected to the transmission shaft (3.2) through the first gear set (3.2). 3.3), the other end of the transmission shaft (3.3) is connected to the tool chuck (4) through the second gear set (3.4), and is used to drive the tool chuck (4) to rotate.

3. The electric tool according to claim 1, characterized in that: the drum-type tool magazine (5) includes a roller (5.1) coaxial with the drum-type tool magazine and a roller bracket for installing the roller (5.1)

(5.2), the casing (1) is provided with a support seat (6), the roller bracket (6.2) is rotationally connected to the support seat (6), and the plane where the rotation track is located is perpendicular to the axis of the roller (5.1) .

4. The electric tool according to claim 3, characterized in that: the support seat (6) is also provided with an arc-shaped groove (6.1) for the rotation guide and position limiting of the roller bracket (5.2), and the roller bracket (5.2) is provided with a first spring (5.4) with a first ball (5.3) at the end that matches the arc-shaped groove (6.1). When the roller bracket (5.2) rotates, the first ball (5.3) moves in the arc Sliding in the groove (6.1), both ends of the arc-shaped groove (6.1) are provided with positioning grooves (6.2) for positioning, and the depth and width of the positioning groove (6.20) are larger than the arc-shaped groove (6. D o

5. The electric tool according to claim 3, characterized in that: the roller bracket (5.2) is provided with a sleeve, and the sleeve includes an inner tube (5.2.1) and an outer tube (5.2) that are sleeved with each other and can rotate relative to each other. .2), outer tube

(5.2.2) As the rotation axis of the roller bracket (5.2), the inner tube (5.2.1) is placed on the transmission shaft (3.3) of the power tool, and the transmission shaft (3.3) can be inserted into the inner tube (5.2. 1) Internal rotation, the inner tube (5.2.1) serves as a support base and is connected to the casing (1) of the power tool to immobilize the inner tube (5.2.1) and support the transmission shaft (3.3).

6. The electric tool according to claim 5, characterized in that, the outer surface of the inner tube (5.2.1) There is a first radial protrusion (5.2.3). The front end face of the first radial protrusion (5.2.3) is provided with two spherical depressions (5.2.4). The two spherical depressions (5.2.4) are along the The outer tube (5.2.2) is distributed circumferentially; the outer surface of the outer tube (5.2.2) is provided with a second radial protrusion (5.2.5), and the rear end surface of the second radial protrusion (5.2.5) There is a steel ball axially supported by an elastic member. The steel ball matches the spherical depression (5.2.4) according to the different rotation positions of the roller bracket (5.2).

7. The electric tool according to claim 3, characterized in that: a tool chamber (5.5) is provided in the roller (5.1) of the roller tool magazine (5), and a shaft is provided in the center of the roller (5.1). The roller bracket (5.2) is provided with a shaft (5.7) that passes through the shaft hole (5.6) and is connected to the roller (5.1). The shaft (5.7) is provided with a shaft perpendicular to the axis direction. Second spring (5.8), both ends of the second spring (5.8) are connected with second balls (5.9), and the circumference of the shaft hole (5.7) is provided with a number corresponding to the number of tool chambers (5.5) The card slot (5.10), the second ball (5.9) cooperates with the card slot (5.10).

8. The electric tool according to any one of claims 1 to 7, characterized in that: the electric tool is an electric screwdriver, and the cutter is a bit of an electric screwdriver.

9. The electric tool according to any one of claims 1 to 7, characterized in that: it includes a push rod (7), which is also rotatably connected to the transmission device, and the plane where its rotation track is located is consistent with the push rod (7). 7) The push rod block (8) has a vertical axis. The push rod block (8) is also provided with an elastic reset mechanism. In the natural state, the push rod block (8) faces the push rod (7). , and offsets the rear end surface of the push rod (7). When the elastic return mechanism is in a force-accumulating state, the push rod block (8) rotates and deflects sideways, deviating from the position where the push rod (7) moves;

The push rod (7) is also provided with a push rod connecting piece (9) and a push rod button (10). The push rod (7) is provided with a first protrusion (11). The push rod connecting piece is (9) is provided with a long hole (12), the first protrusion (11) of the push rod (7) is slidably fitted in the long hole (12), and the push rod button (10) and the push rod connecting piece (9) connection, used to push the push rod connecting piece (9) and the push rod (7) to move axially;

The top of the push rod blocking piece (8) is provided with a cylindrical second protrusion (13), and the push rod connecting piece (9) is provided with a second protrusion (13) that can resist the second protrusion (13) when moving. The third protrusion (14) that rotates the push rod block (8).

10. The electric tool according to claim 9, characterized in that: the elastic return mechanism is a tension spring (15), one end of the tension spring (15) is connected to the transmission device (3), and the other end is connected to the transmission device (3). Push rod cover (8).