CN217905171U

CN217905171U - Electric tool

Info

Publication number: CN217905171U
Application number: CN202221343811.8U
Authority: CN
Inventors: 赵智杰; 林利
Original assignee: Shanghai Chang Krypton Technology Co ltd
Current assignee: Shanghai Chang Krypton Technology Co ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-11-29
Anticipated expiration: 2032-05-19

Abstract

The utility model provides an electric tool, electric tool includes: the device comprises a shell, a working element and a driving device, wherein the driving device is arranged in the shell and used for driving the working element; the shell comprises a battery installation cavity for assembling and disassembling the battery assembly and a cover body for opening and closing the battery installation cavity, and a trigger piece is arranged on the cover body; the electric tool further comprises a safety switch, when the cover body is in a closed state, the safety switch is closed to communicate a circuit between the battery assembly and the driving device, and when the cover body is in an open state, the trigger acts on the safety switch to be opened to cut off the circuit between the battery assembly and the driving device.

Description

Electric tool

Technical Field

The utility model belongs to the technical field of mechanical tool and specifically relates to an electric tool.

Background

At present, household electric tools such as lawn mowers are often provided with a battery pack which can be replaced by a user, for example, a battery pack is provided, and the user can detach the battery pack with exhausted electric quantity to charge and replace the battery pack with a new battery pack.

However, the main control switch is easily touched by mistake to start the electric tool in the process of replacing the battery pack by a user, so that the user is easily injured.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an electric tool triggers safety switch circuit breaker when the lid in battery installation cavity is opened.

In order to achieve one of the above objects of the present invention, an embodiment of the present invention provides an electric tool, including: the device comprises a shell, a working element and a driving device, wherein the driving device is arranged in the shell and is used for driving the working element;

the shell comprises a battery installation cavity for assembling and disassembling the battery assembly and a cover body for opening and closing the battery installation cavity, and a trigger piece is arranged on the cover body;

the electric tool further comprises a safety switch, when the cover body is in a closed state, the safety switch is closed to communicate a circuit between the battery assembly and the driving device, and when the cover body is in an open state, the trigger acts on the safety switch to be opened to cut off the circuit between the battery assembly and the driving device.

As a further improvement of an embodiment of the present invention, the battery module includes at least two sets of battery packs connected in parallel.

As an embodiment of the utility model discloses a further improvement, safety switch includes normally closed switch, the lid is under the open mode, trigger the piece and support and press safety switch, safety switch opens, the lid is under closed condition, trigger with safety switch separates, safety switch is closed.

As an embodiment of the utility model provides a further improvement, lid pivotal connection in the casing, safety switch install in just be located in the casing lid pivot one side, trigger including fixed set up in the inboard trigger bar of lid, during the lid open mode, the trigger bar supports and presses safety switch opens, the lid is from the closed position extremely the trigger bar supports and presses the rotation angle of safety switch position is less than 90.

As a further improvement of an embodiment of the present invention, the cover further includes a pivot connection portion, the pivot connection portion has a direction the end of opening outside the housing, one end of the pivot connection portion with the end fixed connection of the cover, the other end is provided with a rotating shaft connected to the housing, the trigger lever is fixed set up in the pivot connection portion is close to rotating shaft one side, the safety switch is arranged in the pivot connection portion below.

As a further improvement of an embodiment of the present invention, the cover and the casing are connected the middle part indent both sides of one end and form the installation department, the pivot joint portion with the installation department is connected, the casing is including arranging in the connection casing of battery installation cavity one side, it is provided with the pivot connecting portion to connect the casing internal surface, it has the mounting hole to connect the casing, the pivot joint portion passes the mounting hole with the pivot connecting portion are connected, the cover is closed during the battery installation cavity, the installation department covers the mounting hole.

As a further improvement of an embodiment of the present invention, the pivot connection portion includes a portion of the cover toward the inside of the case and toward the direction away from the arc arm extended on one side of the case end portion, and a pivot arm extended on the end of the arc arm toward the outside of the case and toward the end of the cover, the free end of the pivot arm is provided with a pivot, and the center of curvature of the arc arm is located on one side of the pivot.

As a further improvement of an embodiment of the present invention, the trigger bar is fixedly connected to the pivot arm and extends from the pivot arm to a position away from one side of the cover, an included angle between the trigger bar and the cover is 10 ° to 30 °, and the trigger bar is pressed against the safety switch, and the included angle between the trigger bar and the vertical direction is 0 ° to 30 °.

As an embodiment of the present invention, the safety switch includes a normally open switch, the lid is under the closed condition, the trigger part supports and presses the safety switch, the safety switch is closed, the lid is under the open condition, the trigger part with the safety switch separation, the safety switch is opened.

As a further improvement of an embodiment of the present invention, the electric tool includes a push mower, the working element is a mowing element, the electric tool further includes a push handle, and the push handle is provided with a main control switch for controlling the driving device to open and close.

The utility model provides an electric tool is provided with the safety switch that can be triggered by the lid of battery installation cavity, and safety switch sets up on the circuit between battery pack and drive arrangement, and when the user opened the lid, the trigger piece on the lid can act on safety switch and open, cuts off the circuit between battery pack and the drive arrangement, and then can avoid the user to trigger main control switch by mistake and lead to the operational element to move the accidental injury user to electric tool's security performance has been promoted.

Drawings

Fig. 1 is a perspective view of an electric tool according to an embodiment of the present invention;

FIG. 2 is a disassembled view of the power tool shown in FIG. 1;

fig. 3 is a circuit diagram of an electric tool according to an embodiment of the present invention;

FIG. 4 is a schematic view of the battery mounting housing shown in FIG. 1;

FIG. 5 is a schematic view of the power tool battery pack of FIG. 1 mounted thereon;

fig. 6 is another schematic view of the battery pack of the power tool of fig. 5.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

Referring to fig. 1 and 2, the present invention provides an electric tool 10, the electric tool 10 may include a housing 13 and a working element, and the working element may be various elements for realizing functions and completing work of the electric tool 10. A drive device 112 for driving the working element may also be provided within the housing 13, the drive device 112 may comprise a motor. The case 13 may include a battery mounting cavity 171 for attaching and detaching the battery assembly 15, and a cover 14 for opening and closing the battery mounting cavity 171.

Referring to fig. 3, the power tool 10 may be provided with a main control switch 121 for controlling the driving device 112 to open and close. The driving device 112, the battery assembly 15, and the main control switch 121 may be connected in series, and the user may control the operation of the power tool 10 through the main control switch 121.

In an embodiment of the present invention, the power tool 10 may include a push mower, the push mower may include a main body 11 and a push handle 12, the main body 11 may include a housing 13 and a working element, the working element may be a mowing element, and the main switch 121 may be disposed on the push handle 12. The mowing element may be provided at a lower portion of the housing 13, and the main body 11 may further include wheels 111 for user convenience.

In use, a user can open the main control switch 121 to control the battery assembly 15 to supply power to the driving device 112, so that the driving device 112 drives the mowing element to operate. Meanwhile, the user can push the main body 11 of the mower to move through the handle 12 for mowing.

In an embodiment of the present invention, the housing 13 may include a main housing 131 and a battery mounting housing 17 connected to the main housing 131, the upper surface of the main housing 131 is provided with an opening, and the battery mounting housing 17 is installed in the opening. A battery mounting cavity 171 is formed in the battery mounting case 17, and a cavity opening of the battery mounting cavity 171 faces upward.

The battery mounting case 17 is disposed obliquely, the cover 14 is also disposed in an oblique state when the cover 14 is in a closed position for closing the battery mounting cavity 171, an end of the cover 14 close to the handle 12 can be higher than an end far away from the handle 12, an end of the cover 14 can be pivotally mounted on the battery mounting case 17, and the rotation shaft 163 can be disposed at an end of the cover 14 close to the handle 12, so that the cover 14 can be automatically closed under gravity when the user releases the cover 14 with his hand after opening the cover 14. The opening end of the cover 14 away from the rotating shaft 163 may be provided with a hook 147 and a handle groove, a slot cooperating with the hook 147 may be provided on the battery mounting case 17, the cover 14 is fixed to the closing position through the cooperation of the hook 147 and the slot when the battery mounting cavity 171 is closed by the cover 14, and the user may open the cover 14 conveniently through the handle groove.

Referring to fig. 3 to 6, in an embodiment of the present invention, the electric power tool 10 further includes a safety switch 133, the cover 14 may be provided with a trigger 132, the cover 14 may be in a closed state, the safety switch 133 may be in a closed state to connect the circuit between the battery assembly 15 and the driving device 112, at this time, the user may control the operation of the electric power tool 10 through the main control switch 121, the user opens the main control switch 121, the circuit between the battery assembly 15 and the driving device 112 may be completely connected, the battery assembly 15 may supply electric power to the driving device 112, and the driving device 112 drives the working element to operate. In the opened state of the cover 14, the trigger 132 may act as a safety switch 133 to open, and cut off the circuit between the battery assembly 15 and the driving device 112, at this time, even if the main switch 121 is opened, the battery assembly 15 still cannot supply power to the driving device 112.

In the present embodiment, the safety switch 133 is provided in the circuit between the battery module 15 and the driving device 112, the safety switch 133 may be connected in series with the battery module 15, the driving device 112, and the main control switch 121, and the circuit between the battery module 15 and the driving device 112 may be cut off or connected by opening and closing the safety switch 133. The safety switch 133 may be a micro switch that may be triggered by pressure applied to the micro switch by the trigger 132.

The position of the trigger 132 acting on the safety switch 133 may vary according to the installation position of the safety switch 133, and the trigger 132 may act on the safety switch 133 when the cover 14 is at any open position, so as to change the switch state of the safety switch 133 to cut off the circuit between the battery assembly 15 and the driving device 112. For example, after the cover 14 is opened from the position where the battery mounting chamber 171 is completely closed, the trigger 132 immediately acts on the safety switch 133 to change the on-off state of the safety switch 133. For example, the trigger 132 may actuate the safety switch 133 to change the switch state when the cover 14 is opened to a certain position, so as to cut off the circuit between the battery assembly 15 and the driving device 112.

In this way, when the user opens the cover 14 of the battery mounting cavity 171 to replace the battery assembly 15, the safety switch 133 cuts off the circuit between the battery assembly 15 and the driving device 112, so that the user can be prevented from being accidentally injured by the operation of working elements such as mowing elements due to the fact that the user accidentally triggers the main control switch 121. In addition, if the user forgets to close the cover 14 after opening the cover 14 or the cover 14 is not automatically closed due to external factors, the user cannot drive the electric power tool, and water can be further prevented from entering the battery mounting cavity 171 to damage the battery assembly 15 when the battery assembly is used in rainy days or the like.

Further, in an embodiment of the present invention, the battery assembly 15 includes at least two sets of battery packs connected in parallel.

At least two sets of battery packs can supply power to the driving device 112 simultaneously, and can also supply power to the driving device 112 independently, thereby being capable of meeting various requirements. In use, if a user takes out one of the battery packs, the rest of the battery packs can still supply power to the driving device 112 to drive the working elements to operate.

In this way, by providing the safety switch 133 that can be triggered by the trigger 132 on the cover 14 and cut off the circuit between the battery assembly 15 and the driving device 112 when the cover 14 is opened, it is possible to avoid that the user is accidentally injured by the operation of the working element due to the accidental triggering of the main control switch 121 in the process of taking out or putting in a set of battery packs.

Further, referring to fig. 4, in the present embodiment, the battery assembly 15 may include two sets of first and

second battery packs

151 and 152 connected in parallel, and the battery mounting cavity 171 formed in the battery mounting case 17 may include first and second

battery mounting cavities

172 and 173 for mounting the two sets of battery packs, respectively. With the handle 12 as a reference, one side of the handle 12 away from the handle can be defined as a front side, one side of the handle 12 close to the handle can be defined as a rear side, the first battery mounting cavity 172 and the second battery mounting cavity 173 can be arranged in parallel in the front-rear direction, the first battery mounting cavity 172 is located in front of the second battery mounting cavity 173, the second battery mounting cavity 173 is higher than the first battery mounting cavity 172, and a step surface is formed at the connection part of the first battery mounting cavity 172 and the second battery mounting cavity 173.

The battery mounting cavity 171 further includes a receiving cavity 174, the receiving cavity 174 is located at the upper portion of the first battery mounting cavity 172 and the second battery mounting cavity 173, and is communicated with the first battery mounting cavity 172 and the second battery mounting cavity 173 to jointly form the battery mounting cavity 171. The first battery pack 151 is partially received in the receiving cavity 174 when being mounted to the first battery mounting cavity 172, and the second battery pack 152 is partially received in the receiving cavity 174 when being mounted to the second battery mounting cavity 173, thereby facilitating the user to take out the first battery pack 151 or the second battery pack 152.

The first battery mounting cavity 172 includes a first front wall 1721, a first rear wall 1722 opposite to the first front wall 1721, and two opposite first side walls 1723 connecting the first front wall 1721 and the first rear wall 1722, the first front wall 1721 is lower than the first rear wall 1722, and upper edges of the two first side walls 1723 are stepped in a shape that is lower in front and higher in rear. The second battery mounting cavity 173 includes a second front wall 1731, a second rear wall 1732 opposite to the second front wall 1731, and two opposite second side walls 1733 connecting the second front wall 1731 and the second rear wall 1732, and the second front wall 1731, the second rear wall 1732, and the two second rear walls 1732 have substantially the same height but are lower than the height of the second battery pack 152.

The battery mounting housing 17 also includes two opposing receiving cavity side walls 1741 extending upwardly from edges of the first side wall 1723 and the second side wall 1733, and a receiving cavity back wall 1742 extending upwardly from an edge of the second back wall 1732, the two receiving cavity side walls 1741 and the receiving cavity back wall 1742 forming the receiving cavity 174. Receiving cavity side wall 1741 includes a first receiving cavity side wall 1743 corresponding at least in part to first side wall 1723 and a second receiving cavity side wall 1744 corresponding at least in part to second side wall 1733, with top edges of the first receiving cavity side wall 1743 and the second receiving cavity side wall being at an obtuse angle. The first battery pack 151 is partially disposed outside the battery mounting cavity 171 when it is mounted in the battery mounting cavity 171, so that the user can easily take out the first battery pack 151.

The battery mounting case 17 further includes a support wall 176 surrounding the top edge of the receiving cavity 174, and a flange 177 bent downward from the edge of the support wall 176, the flange 177 being supported on the main case 131, the top of the side wall of the receiving cavity 174 protruding from the support wall 176 to form a connection flange 1745, and when the cover 14 is in the closed state, the cover 14 is supported on the support wall 176, and the connection flange 1745 is disposed inside the cover 14.

Referring to fig. 5, the cover 14 includes a cover top wall 141 and a cover front wall 142 extending downward from a front end of the cover top wall 141, and a cover side wall 143 connecting the cover top wall 141 and the cover front wall 142 to the cover 14. When the cover 14 closes the battery mounting cavity 171, the cover top wall 141 substantially covers the upper cavity opening of the battery mounting cavity 171, the cover front wall 142 engages with the first front wall 1721, the cover side wall 143 has an edge contour substantially the same as the edge contour of the receiving cavity side wall 1741, cover sidewall 143 can mate with receiving cavity sidewall 1741 such that cover 14 can enclose first battery pack 151 and second battery pack 152 within battery mounting cavity 171.

The catches 147 may be disposed at the bottom edge of the cover front wall 142 and the handle slots may be disposed at the bottom edge of the cover front wall 142. An arc-shaped handle wall 145 may be provided on the outer side of the cover front wall 142, the handle wall 145 protrudes out of the battery mounting case 17 toward the front, and a handle groove is formed between the handle wall 145 and the cover front wall 142, through which a user can conveniently open the cover 14.

Further, in an embodiment of the present invention, the safety switch 133 includes a normally closed switch, and when the cover 14 is in a state of closing the battery installation cavity 171, the trigger is separated from the safety switch, and the safety switch 133 is closed and in a normally closed state, at this time, the circuit on-off between the battery assembly 15 and the driving device 112 can be controlled by operating the main control switch 121. When the cover 14 is in the open state, the trigger 132 presses the safety switch 133, the safety switch 133 is opened, and the circuit between the battery assembly 15 and the driving device 112 is cut off, and at this time, even if the main switch 121 is opened, the battery assembly 15 does not supply power to the driving device 112.

Referring to fig. 5 and 6, the safety switch 133 may be installed in the housing 13 and located at one side of the rotating shaft 163 of the cover 14, the triggering member may include a triggering rod 132 fixedly disposed at an inner side of the cover 14, and when the cover 14 is in an open state, the triggering rod 132 presses against and opens the safety switch 133.

In the present embodiment, when the cover 14 is opened to the limit position, the triggering rod 132 presses against the safety switch 133 to apply pressure to the safety switch 133, so as to open the safety switch 133 and cut off the connection line between the battery assembly 15 and the driving device 112. At this time, the user may take out the first and second battery packs 151 and 152. The rotation angle of the cover 14 from the closed position to the position where the triggering lever 132 presses the safety switch 133 may be less than 90 °, so that it is ensured that the cover 14 can be automatically closed under the action of gravity after the cover 14 is opened.

Further, in an embodiment of the present invention, the cover 14 includes a pivot connection portion 16, and the cover 14 can be connected to the battery mounting case 17 through the pivot connection portion 16. The pivot connection portion 16 may have an open end facing the outside of the housing 13, the pivot connection portion 16 may have a substantially U shape inclined toward one side of the cover 14, one end of the pivot connection portion 16 is fixedly connected to an end of the cover 14, the other end is provided with a rotation shaft 163 connected to the housing 13, the trigger lever 132 is fixedly disposed on one side of the pivot connection portion 16 close to the rotation shaft 163, and the safety switch 133 is disposed below the pivot connection portion 16.

The provision of the pivotal coupling portion 16 provides a space for the cover 14 to be rotated, and during opening of the cover 14, the cover 14 is lifted upward while being rotated, and the cover 14 does not interfere with the battery mounting case 17. The pivot connection portion 16 can facilitate the setting of the trigger rod 132, the safety switch 133 and the trigger rod 132 can form a limit structure, the safety switch 133 abuts against the trigger rod 132, the lid 14 cannot rotate further, and at this time, the situation that the lid 14 cannot be closed automatically due to an excessively large opening degree can be avoided.

Further, in an embodiment of the present invention, the middle portion of the cover 14 connected to one end of the housing 13 may be recessed, the two sides form the mounting portion 144 relative to the middle portion, the two pivot connecting portions 16 may be provided with two, and the two pivot connecting portions 16 are respectively connected to the two mounting portions 144. The battery mounting case 17 further includes a connecting case 175, the connecting case 175 is disposed on one side of the battery mounting cavity 171, the top surface of the connecting case 175 is higher than the battery mounting cavity 171, the connecting end of the connecting case 175 and the cover 14 is in shape fit with the cover 14, a mounting hole 1751 is disposed on the connecting case 175, and the pivot connecting portion 16 can extend into the connecting case 175 from the mounting hole 1751. The inner surface of the coupling housing 175 is provided with a rotation shaft coupling part 178, and the pivot coupling part 16 is coupled to the rotation shaft coupling part 178 through the mounting hole 1751.

The rotation shaft connecting portion 178 includes a rotation shaft support 1781 integrally provided with the connection housing 175 and a rotation shaft fixing member 1782 connected to the rotation shaft support 1781, the rotation shaft fixing member 1782 may be fixedly connected to the connection rotation shaft support 1781 or the connection housing by a bolt, a rotation shaft hole matched with the rotation shaft 163 is formed between the rotation shaft fixing member 1782 and the rotation shaft support 1781, and the rotation shaft 163 is disposed in the rotation shaft hole, thereby enabling quick installation of the cover 14.

When the battery installation cavity 171 is closed by the cover 14, the cover top wall 141 and the connection housing 175 are substantially on the same plane, the pivot connection portion 16 is disposed inside the connection housing 175, the installation portion 144 of the cover 14 covers the installation hole 1751, and the installation hole 1751 and the rotation shaft 163 are both outside the battery installation cavity 171, so that the cover 14 has a better sealing effect. During the opening of the cover 14, the cover 14 moves upward without interfering with the housing 13.

Further, in an embodiment of the present invention, the pivot connection portion 16 includes an arc arm 161 extending from the end of the cover 14 toward the inside of the housing 13 and toward the side of the end away from the housing 13, and a rotation shaft arm 162 extending from the end of the arc arm 161 toward the top of the housing 13 and toward the end of the cover 14, the free end of the rotation shaft arm 162 is provided with a rotation shaft 163, and the curvature center of the arc arm 161 is located on the side of the rotation shaft 163.

The ends of the arcuate arms 161 are attached to the inner surface of the mounting portion 144. In the rotatory in-process of lid 14, arc arm 161 can not interfere with mounting hole 1751, provides certain camber and the space of stepping down through setting up arc arm 161, can reduce the size of mounting hole 1751, further promotes the sealed effect of lid 14.

Further, in an embodiment of the present invention, the triggering rod 132 is fixedly connected to the rotating shaft arm 162 and extends from the rotating shaft arm 162 to a side away from the cover 14, the safety switch 133 is located below the arc-shaped arm 161 when the cover 14 is in the closed state, when the triggering rod 132 presses the safety switch 133, an included angle between the triggering rod 132 and the vertical direction may be 0 to 30 °, an included angle between the triggering rod 132 and the cover 14 may be 10 to 30 °, specifically, an included angle between the triggering rod 132 and the top wall of the cover is 10 to 30 °, and an angle between the cover closed position and the safety switch pressing position of the triggering rod 132 may be 60 to 80 °.

Provide certain camber and the space of stepping down through setting up arc arm 161, so, safety switch 133 can be close to the setting of pivotal connection 16, and at the rotation in-process, arc arm 161 can not interfere with safety switch 133, and then can guarantee that trigger lever 132 can be stable trigger safety switch 133. When the trigger lever 132 abuts against the safety switch 133, the cover 14 is restricted from further rotation, and the opening angle of the cover 14 can be restricted within the range of 60-80 °, so as to ensure that the cover 14 can be closed under the action of gravity.

The utility model provides another embodiment still, in this embodiment, safety switch 133 is including normally opening the switch, when lid 14 is in the state of closing battery installation cavity 171 completely, trigger part supports presses safety switch 133, safety switch 133 is closed, at this moment, safety switch 133 communicates the circuit between battery pack and the drive arrangement, the user can pass through master switch 121 control electric tool's operation, when the lid is in the open mode, trigger part 132 can separate with safety switch 133, safety switch 133 resumes to the normally open state of opening, cut off the circuit between battery pack 15 and the drive arrangement 112.

In this embodiment, the safety switch 133 may be provided at a lower portion of the open end of the lid 14, a trigger such as the trigger lever 132 may be provided in the lid 14, the trigger lever 132 may press the safety switch 133 to trigger the safety switch 133 to be closed when the lid 14 completely closes the battery mounting cavity 171, and the trigger lever 132 may be separated from the safety switch 133 to trigger the safety switch 133 to be opened when the lid 14 is opened.

Of course, the safety switch 133 may also be installed on the side close to the rotation shaft 163 of the cover 14, the triggering lever 132 is connected to the cover 14, when the cover 14 is closed, the triggering lever 132 presses the safety switch 133 to trigger the safety switch 133 to be closed, and when the cover 14 is opened, the triggering lever 132 is separated from the safety switch 133 to open the safety switch 133, so as to cut off the circuit between the battery assembly 15 and the driving device 112.

In the present embodiment, once the cover 14 is in the incomplete closing state, the safety switch 133 can cut off the circuit between the battery assembly 15 and the driving device 112, so that better safety protection performance can be achieved.

It should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The above detailed description of a series of embodiments is only for the purpose of illustration, and is not intended to limit the scope of the invention, which is intended to include all equivalent embodiments or modifications that do not depart from the spirit of the invention.

Claims

1. A power tool, characterized in that the power tool comprises: the device comprises a shell, a working element and a driving device, wherein the driving device is arranged in the shell and used for driving the working element;

the electric tool also comprises a safety switch, and when the cover body is in a closed state, the safety switch is closed and is communicated with a circuit between the battery pack and the driving device; and under the opening state of the cover body, the trigger piece acts on the safety switch to open, and a circuit between the battery assembly and the driving device is cut off.

2. The power tool of claim 1, wherein the battery pack includes at least two sets of battery packs connected in parallel.

3. The power tool of claim 1, wherein the safety switch comprises a normally closed switch, the trigger member presses against the safety switch when the cover is in the open state, the safety switch is open, the trigger member is separated from the safety switch when the cover is in the closed state, and the safety switch is closed.

4. The power tool of claim 3, wherein the cover is pivotally connected to the housing, the safety switch is mounted in the housing and located on one side of the cover rotation axis, the trigger includes a trigger lever fixedly disposed on an inner side of the cover, the trigger lever presses against the safety switch to open the safety switch when the cover is in an open state, and a rotation angle of the cover from a closed position to a position where the trigger lever presses against the safety switch is less than 90 °.

5. The power tool of claim 4, wherein the cover further comprises a pivot connection portion, the pivot connection portion has an open end facing the outside of the housing, one end of the pivot connection portion is fixedly connected to an end portion of the cover, the other end of the pivot connection portion is provided with a rotating shaft connected to the housing, the trigger lever is fixedly arranged on one side of the pivot connection portion close to the rotating shaft, and the safety switch is arranged below the pivot connection portion.

6. The power tool of claim 5, wherein the cover is connected to the housing at both sides of the concave portion of the middle portion to form mounting portions, the pivot connection portion is connected to the mounting portions, the housing includes a connection housing disposed at one side of the battery mounting cavity, a rotation shaft connection portion is disposed on an inner surface of the connection housing, the connection housing has a mounting hole, the pivot connection portion passes through the mounting hole to be connected to the rotation shaft connection portion, and when the cover closes the battery mounting cavity, the mounting portion covers the mounting hole.

7. The power tool of claim 6, wherein the pivotal connection includes an arc-shaped arm extending from the end of the cover toward the inside of the housing toward the side away from the end of the housing, and a spindle arm extending from a tip of the arc-shaped arm toward the top of the housing toward the end of the cover, a free end of the spindle arm being provided with a spindle, a center of curvature of the arc-shaped arm being located on the spindle side.

8. The power tool of claim 7, wherein the trigger bar is fixedly connected to the pivot arm and extends from the pivot arm to a side away from the cover, an included angle between the trigger bar and the cover is 10 ° to 30 °, and when the trigger bar presses against the safety switch, the included angle between the trigger bar and the vertical direction is 0 ° to 30 °.

9. The power tool of claim 1, wherein the safety switch comprises a normally open switch, the trigger presses against the safety switch when the cover is in the closed state, the safety switch is closed, and the trigger is separated from the safety switch when the cover is in the open state, the safety switch is open.

10. The power tool of any one of claims 1-9, wherein the power tool comprises a push mower, the working element is a grass cutting element, and the power tool further comprises a push handle, and the push handle is provided with a main control switch for controlling the driving device to open and close.