Power tool

Abstract

The electric tool comprises a housing, a motor, an output shaft and a locking mechanism; the locking mechanism comprises a locking shaft piece sleeved on the outer periphery of the output shaft, and the locking shaft piece has a first position for locking the output shaft and a second position for releasing the output shaft; the locking mechanism comprises a locking lever moving in the axial direction, a transmission wheel meshing with the locking lever and a transmission rod rotating driven by the transmission wheel, and the transmission rod is linked to the locking shaft piece; when the locking shaft piece moves from the first position to the second position, the locking lever is pressed in the axial direction and drives the transmission wheel to rotate, the transmission wheel drives the transmission rod to rotate around the rotation center, and then drives the locking shaft piece to move in the radial direction perpendicular to the axial direction. When it is needed to release the locking state of the output shaft, the locking lever only needs to be pressed, and the switch cannot be pressed when the output shaft is locked, so that the operation safety of the operator is improved; after the electric tool is used, the switch is released, the locking shaft piece automatically moves to the locking position, and no additional operation is needed.

Description

[Technical Field]

[0001] This invention relates to the field of power tool technology, and in particular to a power tool with an improved locking mechanism. [Background Technology]

[0002] Power tools that use rotating attachments such as saw blades for machining typically include a shaft locking mechanism. This mechanism locks the output shaft during saw blade installation and removal, restricting its rotation and preventing accidental activation of the power tool's start switch, which could injure the operator. However, existing shaft locking mechanisms require one hand to hold the locking plate while the other hand uses a wrench to loosen or tighten the locking nut, both steps must be performed simultaneously, making the operation very inconvenient.

[0003] Therefore, it is indeed necessary to provide an improved power tool to overcome the shortcomings of the prior art. [Summary of the Invention]

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide an electric tool with a locking mechanism, which has the advantage of being easy to operate.

[0005] The technical solution adopted by the present invention to solve the problems of the prior art is as follows: an electric tool, including a housing, a motor housed in the housing, an output shaft driven by the motor, and a locking mechanism located in the housing, wherein the output shaft extends axially and rotates about an axis; the locking mechanism includes a locking plate sleeved on the outer periphery of the output shaft, the locking plate having a first position for locking the output shaft and a second position for releasing the output shaft; the locking mechanism includes a locking lever that moves axially, a transmission wheel meshing with the locking lever, and a transmission rod driven to rotate by the transmission wheel, the transmission rod being linked to the locking plate; when the locking plate moves from the first position to the second position, the locking lever is pressed axially and drives the transmission wheel to rotate, the transmission wheel drives the transmission rod to rotate about a rotation center, thereby driving the locking plate to move radially perpendicular to the axial direction.

[0006] A further improvement is as follows: the locking lever is provided with several first engagement teeth located on the side close to the transmission wheel, and the transmission wheel is provided with a cylindrical portion adjacent to the locking lever and several second engagement teeth located on the outer periphery of the cylindrical portion; the first engagement teeth mesh with the second engagement teeth, and the second engagement teeth convert the linear motion of the first engagement teeth into circular motion.

[0007] A further improvement is as follows: the housing is provided with an annular groove adjacent to the locking lever, the cylindrical part is mounted in the annular groove, and the transmission wheel rotates in the annular groove through the cylindrical part.

[0008] A further improvement is as follows: the transmission wheel is provided with a roller located at the other end away from the locking lever, the transmission rod is provided with a front end adjacent to the transmission wheel and a baffle located on the front end, the transmission wheel rotates so that the roller continuously abuts against the baffle, thereby driving the transmission rod to rotate.

[0009] A further improvement is as follows: the transmission rod has a rear end that is away from the transmission wheel, the locking shaft plate has a joint portion that is adjacent to the rear end and bent to form a joint portion, and the rear end abuts against the joint portion.

[0010] A further improvement is as follows: the housing is provided with a pivot shaft extending axially, the transmission rod is provided with a shaft hole located between the front end and the rear end, the shaft hole passes through the transmission rod axially, the transmission rod is installed on the pivot shaft through the shaft hole, and the transmission rod rotates around the axis of the pivot shaft.

[0011] A further improvement is as follows: the locking plate has a flat groove located in the middle part, and the output shaft has a flat part located at the end. The flat groove and the flat part cooperate to realize the locking or releasing of the output shaft.

[0012] A further improvement is as follows: the housing is provided with a radially extending receiving groove, and the locking mechanism is provided with a locking spring housed in the receiving groove. The locking spring moves the locking plate from the second position to the first position by biasing force. When the locking plate is in the first position, the flat groove and the flat part engage with each other to lock the output shaft, and the locking spring is in a normal state. When the locking plate is in the second position, the flat groove and the flat part separate from each other to allow the output shaft to rotate normally, and the locking spring is in a compressed state.

[0013] A further improvement is as follows: the power tool includes a switch for controlling the start of the motor, the switch has a hollow groove and an intermediate block protruding from the groove toward the locking lever, the locking lever has a limiting part extending toward the groove, and the limiting part can abut against the intermediate block.

[0014] A further improvement is as follows: when the locking pin is in the first position, the intermediate block abuts against the limiting part, and the switch cannot be pressed; when the locking pin is in the second position, the intermediate block disengages from the limiting part, and the switch is pressed so that the limiting part is received in the groove.

[0015] Compared with the prior art, the present invention has the following advantages: The locking mechanism includes a locking lever that moves axially, a transmission wheel meshing with the locking lever, and a transmission rod driven to rotate by the transmission wheel. The transmission rod is linked to the locking shaft piece. When the locking shaft piece moves from the first position to the second position, the locking lever is pressed axially and drives the transmission wheel to rotate. The transmission wheel drives the transmission rod to rotate around the rotation center, thereby driving the locking shaft piece to move radially perpendicular to the axial direction. When the power tool is stopped, the locking shaft piece is in the first position, the output shaft is locked, and the switch is against the locking lever and cannot be pressed. When the power tool needs to be run, pressing the locking lever axially can release the locked state of the output shaft. The locking shaft piece moves from the first position to the second position, and the switch can be pressed to start the motor and drive the output shaft to rotate. When the power tool needs to be stopped, the switch is released, the output shaft stops rotating, and the locking shaft piece moves from the second position to the first position under the biasing force of the locking shaft spring. The switch is against the locking lever, and the power tool cannot be started.

[0016] With this design, when it is necessary to unlock the output shaft, simply press the locking lever. The switch cannot be pressed when the output shaft is locked, improving operator safety. After using the power tool, releasing the switch automatically moves the locking plate to the locked position, requiring no further operation. This locking mechanism makes locking and unlocking the output shaft convenient and quick, requiring only one hand. [Image Description]

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 This is a perspective view of a power tool according to a preferred embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A three-dimensional schematic diagram of the power tool shown from another angle;

[0020] Figure 3 yes Figure 2 An exploded view of the power tool shown.

[0021] Figure 4 yes Figure 3 A three-dimensional schematic diagram of some components of the power tool in the first position;

[0022] Figure 5 yes Figure 4 A three-dimensional schematic diagram of some components of the power tool in the first position;

[0023] Figure 6 yes Figure 5 A three-dimensional schematic diagram of some components of the power tool in the first position;

[0024] Figure 7 yes Figure 5 A three-dimensional schematic diagram of some components of the power tool during the unlocking process;

[0025] Figure 8 yes Figure 7 A three-dimensional schematic diagram of some components of the power tool during the unlocking process;

[0026] Figure 9 yes Figure 5 A three-dimensional schematic diagram of some components of the power tool in the second position;

[0027] Figure 10 yes Figure 9 A three-dimensional schematic diagram of some components of the power tool in the second position;

[0028] Figure 11 yes Figure 10 A three-dimensional schematic diagram of some components of the power tool in the second position;

[0029] Figure 12 yes Figure 10 The diagram shows a three-dimensional representation of some components of a power tool in its second position. The meanings of the reference numerals in the diagram are as follows:

[0030] Power tools 100, tool body 1

[0031] Casing 10 Pivot Shaft 101

[0032] Container 102 Controller 103

[0033] Annular groove 104 Grip part 11

[0034] Main controller 111 Auxiliary controller 112

[0035] Connection part 113 Switch 114

[0036] Middle block 1140, groove 1141

[0037] Motor 12 Motor housing 121

[0038] Screw 1210 Stator 122

[0039] Rotor 123 Fan 124

[0040] Motor shaft 125, output shaft 13

[0041] Flat position 131 Locking mechanism 14

[0042] Locking lever 141 Limiting part 1410

[0043] First engagement gear 1411, transmission wheel 142

[0044] Cylindrical part 1420 Second mating tooth 1421

[0045] Roller 1422, Drive rod 143

[0046] baffle 1430, shaft hole 1431

[0047] Frontend 1432 Backend 1433

[0048] Locking pin 144, joint 1440

[0049] Flat slot 1441 Locking spring 1442

[0050] Power cord 15, base plate 2

[0051] Angle adjustment mechanism 3 Depth adjustment mechanism 4

[0052] Saw blade 5, inner pressure plate 50

[0053] External pressure plate 51, protective cover 6

[0054] Fixed cover 60, movable cover 61

[0055] First position A Second position B [Detailed Implementation]

[0056] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0057] Please see Figures 1 to 12The diagram illustrates a preferred embodiment of a power tool according to the present invention, specifically an electric cutting tool, and more specifically, an electric circular saw 100. The electric circular saw 100 can cut a workpiece (not shown), which refers to any blocky, plate-shaped, or tubular cutable material, such as wood, plastic, glass, or metal. The electric circular saw 100 includes a tool body 1 and a base plate 2 for supporting the tool body 1. The tool body 1 is provided with a detachable and installable circular saw blade 5, which is used to cut the workpiece. The base plate 2 is preferably made of a robust and durable material (e.g., metal), and in this embodiment, it is made of magnesium alloy. The base plate 2 has a generally rectangular plate structure and a flat bottom surface (not shown), which abuts against the upper surface of the workpiece during the cutting operation.

[0058] Please combine Figures 1 to 6 As shown, the tool body 1 includes a housing 10 fixed to the upper surface of the base plate 2, a grip portion 11 connected to the housing 10, a motor 12 housed in the housing 10, an output shaft 13 driven by the motor 12, a locking mechanism 14 located in the housing 10, and a power cord 15 connected to the rear end of the grip portion 11. The power cord 15 is electrically connected to an external power source to provide the energy required for the operation of the electric circular saw 100.

[0059] The grip portion 11 includes a main handle 111 perpendicular to the axial direction of the motor 12 and located above the base plate 2, and an auxiliary handle 112 located in front of the main handle 111 and beside the saw blade 5. The main handle 111 and the auxiliary handle 112 are respectively used for the operator to hold with both hands, so as to achieve the purpose of holding the electric circular saw 100 with both hands, thereby enabling the operator to operate the electric circular saw 100 more stably. The grip portion 11 also includes a connecting portion 113 disposed between the main handle 111 and the auxiliary handle 112, the connecting portion 113 connecting the main handle 111 and the auxiliary handle 112.

[0060] Furthermore, a trigger-type switch 114 is provided on the inner side of the main handle 111, which allows the operator to control the start and stop of the electric circular saw 100. When the operator presses the switch 114 with the fingertips of the hand holding the main handle 111, the motor 12 starts, causing the saw blade 5 to rotate.

[0061] Please combine Figures 1 to 3As shown, the motor 12 is mounted on one side of the saw blade 5, and the rotation axis of the motor 12 is perpendicular to the surface of the saw blade 5. The motor 12 can be an internal rotor type brushless motor, and the motor 12 includes a motor shaft 125 extending axially, a rotor 123 fixed on the motor shaft 125, a stator 122 sleeved on the outer periphery of the rotor 123, and a fan 124 fixed on the motor shaft 125 and located at one end of the stator 122. The rotor 123 is rotatably supported on the inner side of the cylindrical stator 122. Since it is not necessary to configure a commutator and brushes on the rotor 123, the motor 12 can be axially compacted accordingly. The fan 124 is a centrifugal fan, which is used to draw cooling air into the motor 12 and cool the motor 12.

[0062] Furthermore, the stator 122 is surrounded by a motor housing 121, and the stator 122 and the rotor 123 are housed within the motor housing 121. The motor 12 also includes several screws 1210, and the stator 122 and the motor housing 121 have several threaded holes (not shown). The screws 1210 engage with the threads to fix the stator 122 to the motor housing 121.

[0063] The output shaft 13 is connected to the end of the motor 12 away from the stator 122, and the axis of the output shaft 13 coincides with the axis of the motor shaft 125. Preferably, the output shaft 13 can also be the motor shaft 125.

[0064] The housing 10 houses a controller 103, which includes various circuits for controlling the operation and power supply of the motor 12.

[0065] Please combine Figures 4 to 12 As shown, the tool body 1 is provided with a locking mechanism 14 located inside the housing 10. The locking mechanism 14 is used to lock the rotation of the output shaft 13 when the motor 12 is not powered. The saw blade 5 is mounted on the end of the output shaft 13. When it is necessary to disassemble and install the saw blade 5 relative to the output shaft 13, in order to ensure the safety of the operator, it is necessary to restrict the rotation of the output shaft 13.

[0066] The locking mechanism 14 is movable between a locked position and an unlocked position. In the locked position, it engages with the output shaft 13 to lock the rotation of the output shaft 13. The locking mechanism 14 includes a locking plate 144 sleeved on the outer periphery of the output shaft 13. The locking plate 144 has a first position A for locking the output shaft 13 and a second position B for releasing the output shaft 13.

[0067] The output shaft 13 has a flat portion 131 at one end, and the locking plate 144 has a flat portion groove 1441 in the middle portion. The flat portion groove 1441 engages with the flat portion 131 to lock or release the output shaft 13. In the first position A, the flat portion groove 1441 and the flat portion 131 are engaged to lock the output shaft 13; in the second position B, the flat portion groove 1441 and the flat portion 131 are disengaged to allow the output shaft 13 to rotate normally.

[0068] The locking mechanism 14 further includes a locking lever 141 that moves axially, a transmission wheel 142 meshing with the locking lever 141, and a transmission rod 143 driven to rotate by the transmission wheel 142. The transmission rod 143 is linked to the locking shaft piece 144. When the locking shaft piece 144 moves from the first position A to the second position B, the locking lever 141 is pressed axially and drives the transmission wheel 142 to rotate. The transmission wheel 142 drives the transmission rod 143 to rotate around the rotation center, thereby driving the locking shaft piece 144 to move radially perpendicular to the axial direction, releasing the output shaft 13.

[0069] The locking lever 141 has several first engagement teeth 1411 located on one side near the transmission wheel 142. The transmission wheel 142 has a cylindrical portion 1420 adjacent to the locking lever 141 and several second engagement teeth 1421 located on the outer periphery of the cylindrical portion 1420. The first engagement teeth 1411 mesh with the second engagement teeth 1421. When the locking lever 141 is pressed to rotate the first engagement teeth 1411, the second engagement teeth 1421 rotate accordingly, causing the transmission wheel 142 to rotate. The second engagement teeth 1421 convert the linear motion of the first engagement teeth 1411 into circular motion.

[0070] Furthermore, the housing 10 is provided with an annular groove 104 adjacent to the locking lever 141, the cylindrical portion 1420 is mounted in the annular groove 104, and the transmission wheel 142 rotates in the annular groove 104 through the cylindrical portion 1420.

[0071] The transmission wheel 142 is provided with a roller 1422 located at the other end away from the locking lever 141. The transmission rod 143 is provided with a front end 1432 adjacent to the transmission wheel 142 and a baffle 1430 located on the front end 1432. The transmission wheel 142 rotates so that the roller 1422 continuously abuts against the baffle 1430. The roller 1422 transmits the rotational motion of the transmission wheel 142 to the transmission rod 143, thereby driving the transmission rod 143 to rotate.

[0072] The transmission rod 143 has a rear end 1433 away from the transmission wheel 142. The front end 1432 and the rear end 1433 are respectively located at both ends of the transmission rod 143. The locking shaft piece 144 has a connecting portion 1440 that is adjacent to the rear end 1433 and is bent to form a joint. The rear end 1433 abuts against the connecting portion 1440.

[0073] The housing 10 is provided with a pivot shaft 101 extending axially, and the transmission rod 143 is provided with a shaft hole 1431 located between the front end 1432 and the rear end 1433. The shaft hole 1431 passes through the transmission rod 143 axially, and the transmission rod 143 is installed to the pivot shaft 101 through the shaft hole 1431. The transmission rod 143 rotates around the axis of the pivot shaft 101 and drives the locking plate 144 to move radially.

[0074] The housing 10 is provided with a radially extending receiving groove 102, and the locking mechanism 14 is provided with a locking spring 1442 housed within the receiving groove 102. The locking spring 1442 can move the locking plate 144 from the second position B to the first position A by biasing force. When the locking plate 144 is located in the first position A, the locking spring 1442 is in a normal state; when the locking plate 144 is located in the second position B, the locking spring 1442 is in a compressed state.

[0075] Please combine Figure 11 As shown, the switch 114 has a hollow groove 1141 and an intermediate block 1140 protruding from the groove 1141 toward the locking lever 141. The locking lever 141 has a limiting portion 1410 extending toward the groove 1141. When the locking pin 144 is in the first position A, the intermediate block 1140 abuts against the limiting portion 1410, and the switch 114 cannot be pressed. When the locking pin 144 is in the second position B, the intermediate block 1140 disengages from the limiting portion 1410, and the switch 114 is pressed so that the limiting portion 1410 is received in the groove 1141.

[0076] The locking mechanism 14 can lock and release the output shaft 13 through the linkage of related components. When the electric circular saw 100 is in the stopped state, the locking shaft piece 144 is located in the first position A, and the output shaft 13 is locked; and the intermediate block 1140 is held by the limiting part 1410, so the switch 114 cannot be pressed to start the electric circular saw 100.

[0077] Please combine Figure 11 and Figure 12As shown, at this time, the locking lever 141 needs to be pressed along the axial direction. For the convenience of the operator, the locking lever 141 can be pressed in two directions along the axial direction, which can release the output shaft 13. When the locking lever 141 moves along the axial direction, the linear motion is converted into the circular motion of the transmission wheel 142 through the meshing of the first engagement tooth 1411 and the second engagement tooth 1421.

[0078] The transmission wheel 142 continuously abuts the roller 1422 against the baffle 1430 through circumferential motion, driving the transmission rod 143 to rotate around the pivot shaft 101; and driving the rear end 1433 to pull the connecting part 1440 to move, thereby causing the locking shaft piece 144 to move axially, and compressing the locking shaft spring 1442 from the normal state to the compressed state, releasing the locking state of the output shaft 13, and the motor 12 can drive the output shaft 13 to rotate.

[0079] While the locking lever 141 is pressed, the limiting part 1410 gradually disengages from the intermediate block 1140. After the pressing action is completed, the limiting part 1410 disengages from the intermediate block 1140. At this time, the operator can press the switch 114 to make the limiting part 1410 accommodate in the groove 1141 and start the electric circular saw 100.

[0080] When the electric circular saw 100 is finished in use, the switch 114 is released. The biasing force of the locking shaft spring 1442 moves the locking shaft plate 144 from the second position B to the first position A. The transmission rod 143, the transmission wheel 142, and the locking lever 141 move back to the locked state in the opposite direction to the unlocking process, locking the output shaft 13. At the same time, the limiting part 1410 abuts against the intermediate block 1140 to prevent the operator from accidentally pressing the switch 114.

[0081] The locking mechanism 14 allows for convenient and quick release of the output shaft 13 from its locked state. After the electric circular saw 100 is finished being used, the operator only needs to release the switch 114 to lock the output shaft 13 from its released state.

[0082] Please see Figures 1 to 3 As shown, the electric circular saw 100 also includes an angle adjustment mechanism 3 located at the front end of the base plate 2, a depth adjustment mechanism 4 located at the rear end of the base plate 2, and a protective cover 6 covering the saw blade 5. The angle adjustment mechanism 3 and the depth adjustment mechanism 4 are arranged perpendicular to the base plate 2. The required angle can be adjusted by rotating the angle adjustment mechanism 3 to control the cutting angle, and the required depth can be adjusted by moving the depth adjustment mechanism 4 to control the cutting depth, which is practical and convenient.

[0083] Furthermore, an inner pressure plate 50 and an outer pressure plate 51 are provided on both sides of the saw blade 5, and the inner pressure plate 50 and the outer pressure plate 51 fix and clamp the saw blade 5 onto the output shaft 13. The protective cover 6 includes a fixed cover 60 covering approximately half a circumference of the upper side of the saw blade 5 and a movable cover 61 covering approximately half a circumference of the lower side of the saw blade 5. The movable cover 61 is supported so that it can rotate around the center of the saw blade 5 and can be opened and closed by rotation. The protective cover 6 is preferably made of metal.

[0084] In this embodiment, the locking mechanism 14 includes a locking lever 141 that moves axially, a transmission wheel 142 meshing with the locking lever 141, and a transmission rod 143 driven to rotate by the transmission wheel 142. The transmission rod 143 is linked to the locking shaft piece 144. When the locking shaft piece 144 moves from the first position A to the second position B, the locking lever 141 is pressed axially and drives the transmission wheel 142 to rotate. The transmission wheel 142 drives the transmission rod 143 to rotate around the rotation center, thereby driving the locking shaft piece 144 to move radially perpendicular to the axial direction. When the power tool is stopped, the locking shaft piece 144 is in the first position A, the output shaft 13 is locked, and the switch 114 abuts against the locking lever 141 and cannot be pressed. When the power tool needs to be run, pressing the locking lever 141 axially can release the locked state of the output shaft 13. The locking shaft piece 144 moves from the first position A to the second position B, and the switch 114 can be pressed to start the motor 12 and drive the output shaft 13 to rotate. When the power tool needs to be stopped, release switch 114, the output shaft 13 stops rotating, the locking plate 144 moves from the second position B to the first position A under the bias force of the locking spring 1442, and switch 114 abuts against the locking lever 141, so the power tool cannot be pressed to start.

[0085] With this configuration, when it is necessary to release the locked state of the output shaft 13, simply press the locking lever 141. Furthermore, the switch 114 cannot be pressed when the output shaft 13 is locked, improving operator safety. After using the power tool, releasing the switch 114 automatically moves the locking plate 144 to the locked position, requiring no additional operation. The locking and unlocking process of this locking mechanism 14 for the output shaft 13 is convenient and quick, and can be completed with just one hand.

[0086] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative power tools can be developed without departing from the principles and scope of this invention. The scope of protection of this invention is defined by the claims.

Claims

1. A power tool, comprising a housing, a motor housed within the housing, an output shaft driven by the motor, and a locking mechanism located within the housing, the output shaft extending axially and rotatable about an axis; the locking mechanism comprising a locking plate sleeved on the outer periphery of the output shaft, the locking plate having a first position for locking the output shaft and a second position for releasing the output shaft; characterized in that: The locking mechanism includes a locking lever that moves axially, a transmission wheel that meshes with the locking lever, and a transmission rod that is driven to rotate by the transmission wheel. The transmission rod is linked to the locking shaft piece and is rotatably connected to the housing. When the locking pin moves from the first position to the second position, the locking lever is pressed axially and drives the transmission wheel to rotate. The transmission wheel drives the transmission rod to rotate around the rotation center, thereby driving the locking pin to move radially perpendicular to the axial direction. The transmission rod includes a front end adjacent to the transmission wheel and a rear end away from the transmission wheel. The transmission wheel is provided with a roller at the other end away from the locking lever. The transmission wheel rotates so that the roller continuously abuts against the front end. The locking pin includes a connecting portion adjacent to the rear end, and the rear end is connected to the connecting portion.

2. The power tool according to claim 1, characterized in that: The locking lever has several first engagement teeth located on one side near the transmission wheel, and the transmission wheel has a cylindrical portion adjacent to the locking lever and several second engagement teeth located on the outer periphery of the cylindrical portion; the first engagement teeth mesh with the second engagement teeth, and the second engagement teeth convert the linear motion of the first engagement teeth into circular motion.

3. The power tool according to claim 2, characterized in that: The housing has an annular groove adjacent to the locking lever, the cylindrical part is mounted in the annular groove, and the transmission wheel rotates in the annular groove through the cylindrical part.

4. The power tool according to claim 1, characterized in that: The transmission rod also includes a baffle disposed on the front end. The transmission wheel rotates to make the roller continuously abut against the baffle, thereby driving the transmission rod to rotate.

5. The power tool according to claim 1, characterized in that: The connecting portion is formed by bending from the end of the locking shaft piece near the transmission rod, and the rear end abuts against the connecting portion.

6. The power tool according to claim 1, characterized in that: The housing is provided with a pivot shaft extending along the axial direction, and the transmission rod is provided with a shaft hole located between the front end and the rear end. The shaft hole passes through the transmission rod along the axial direction, and the transmission rod is installed on the pivot shaft through the shaft hole. The transmission rod rotates about the axis of the pivot shaft.

7. The power tool according to claim 1, characterized in that: The locking plate has a flat groove in the middle portion, and the output shaft has a flat part at the end. The flat groove and the flat part cooperate to lock or release the output shaft.

8. The power tool according to claim 7, characterized in that: The housing is provided with a radially extending receiving groove, and the locking mechanism is provided with a locking spring housed in the receiving groove. The locking spring moves the locking plate from the second position to the first position by biasing force. When the locking plate is in the first position, the flat slot and the flat slot engage with each other to lock the output shaft, and the locking spring is in the normal state. When the locking plate is in the second position, the flat slot and the flat slot separate from each other to allow the output shaft to rotate normally, and the locking spring is in the compressed state.

9. The power tool according to claim 1, characterized in that: The power tool includes a switch for controlling the start of the motor. The switch has a hollow groove and an intermediate block protruding from the groove toward the locking lever. The locking lever has a limiting part extending toward the groove, and the limiting part can abut against the intermediate block.

10. The power tool according to claim 9, characterized in that: When the locking pin is in the first position, the intermediate block abuts against the limiting part, and the switch cannot be pressed; when the locking pin is in the second position, the intermediate block disengages from the limiting part, and the switch is pressed so that the limiting part is received in the groove.

Images