Patent Description:
Earth augers are widely used in landscaping projects for seedlings on slopes, sandy and hard soils, such as planting digging, digging the outer soil of large trees, burying piles and digging holes in fences, fertilizing, digging holes for fruit trees and cultivation and weeding in landscaping projects and so on. The digging diameter of the earth auger is usually between <NUM>-<NUM>, and the number of digging pits per hour is not less than <NUM>. According to the normal <NUM>-hour working time of a day, <NUM> pits can be dug, which is more than <NUM> times that of manual work. It can be seen that the working efficiency of earth auger is much higher than manual operation, which makes people free from heavy physical labor.

A prior art earth auger is disclosed in <CIT>. The document discloses an earth drilling device having a drive unit connected to at least one support frame. The support frame has two handles which are spaced apart and radially spaced on the same side of the drilling axis at approximately the same height and are connected to one another via a connecting part which merges into the end of one handle.

Another prior art earth auger is disclosed in <CIT>. The document discloses an electric drill comprising a support, a drill rod, a motor assembly and a switch assembly provided with the self-locking button so that the electric drill can be started only when the switch and the self-locking button are triggered at the same time.

However, when drilling a hole in the ground, it may happen that the roots of the trees or the stones and other foreign objects are drilled and cause blocked rotation. At this time, there will be a great reaction torque transmitted to the operator through the earth auger. Once the reaction torque exceeds the operator's control range, it will cause the auger to lose control and an injury accident will happen.

One solution is provided in <CIT> disclosing a portable handheld drilling apparatus for receiving and driving a drill which can encounter a drilling resistance during a drilling operation thereby causing the drilling apparatus to undergo an unwanted rotational movement.

In view of the problems mentioned above, it is necessary to provide a new earth auger to solve these problems.

In view of the shortcomings of the above solution, the disclosure provides an earth auger, which can passively trigger the brake assembly when the rotation is blocked, so as to effectively prevent accidental injuries and improve the safety performance of the earth auger.

The disclosure provides an earth auger comprising: a supporting assembly, a drill pipe assembly including a drill pipe, a driving assembly arranged on the supporting assembly to drive the drill pipe assembly to work, and a brake assembly including a trigger component that brakes the driving assembly and a brake lever connected through a first pivot and matched with the trigger component. A projection part of the brake lever on a plane perpendicular to an axis of the drill pipe is located outside a projection of the supporting assembly on the plane perpendicular to the axis of the drill pipe.

The disclosure also provides an earth auger comprising: a supporting assembly, a drill pipe assembly including a drill pipe, a driving assembly arranged on the supporting assembly to drive the drill pipe assembly to work, and a brake assembly including a trigger component that brakes the driving assembly and a brake lever connected through a first pivot and matched with the trigger component. When a drill of the earth auger is blocked, the brake lever is in contact with the operator, so that the brake lever triggers the trigger component and then brakes the driving assembly.

In summary, the disclosure provides an earth auger that can passively trigger the brake assembly when the drill is blocked, thereby effectively preventing accidents and improving the safety performance of the earth auger.

The following describes the implementation of the disclosure through specific embodiments, and those skilled in the art can easily understand other advantages and effects of the disclosure from the content disclosed in this specification.

It should be noted that the figures provided in this embodiment only illustrate the basic idea of the disclosure in a schematic manner. The figures only show the components related to the disclosure instead of drawing according to the number, shape and size of the components during actual implementation. The type, number and proportion of each component during actual implementation can be changed at will, and the layout of its components may also be more complicated.

The disclosure provides an earth auger that can passively trigger the brake assembly when the drill is blocked, thereby effectively preventing accidents and ensuring the operators' safety.

Please refer to <FIG>, the disclosure provides an earth auger <NUM> which includes a supporting assembly <NUM>, a handle assembly <NUM> mounted on the supporting assembly <NUM>, a drill pipe assembly <NUM>, a driving assembly <NUM>, a lighting assembly <NUM> and a brake assembly <NUM>. The driving assembly <NUM> can be mounted on the supporting assembly <NUM> to drive the drill pipe assembly <NUM> to work.

Please refer to <FIG> and <FIG>, the supporting assembly <NUM> includes a supporting platform <NUM> and a bracket <NUM>. The supporting platform <NUM> can be in the shape of a flat plate and mounted on the bracket <NUM>. The supporting platform <NUM> can be provided with a through hole <NUM>, a torque bearing component <NUM>, and a lamp trough <NUM> which are matched with the driving assembly <NUM>. The torque bearing components <NUM> is used to bear the torque transmitted by the driving assembly <NUM> to the supporting platform <NUM>, and the number of the torque bearing component <NUM> can be set according to different structural requirements. When the number of torque bearing components <NUM> is more than one, the torque bearing components <NUM> are evenly distributed on the periphery of the through hole <NUM>, so that each torque bearing component <NUM> bears almost equal torques and the damage to the torque bearing component <NUM> due to uneven torque bearing is effectively avoided. The lamp trough <NUM> penetrates the supporting platform <NUM> in a direction perpendicular to the supporting platform <NUM>. In this embodiment, the numbers of the lamp trough <NUM> and the torque bearing component <NUM> can be three, for example. The torque bearing components <NUM> and the lamp troughs <NUM> are evenly distributed on the periphery of the through hole <NUM> and the torque bearing component <NUM> and the lamp trough <NUM> are set apart from each other. The bracket <NUM> includes a main bracket <NUM> and an armrest frame <NUM>, and the armrest frame <NUM> is formed by bending and extending both sides of the main bracket <NUM>. The supporting platform <NUM> is mounted on the main bracket <NUM> by screws, and a grip cover <NUM> can be provided on the armrest frame <NUM> to improve the user's feeling.

Please refer to <FIG>, the handle assembly <NUM> can be mounted on the armrest frame <NUM>. In this embodiment, the grip cover <NUM> is mounted on one side of the armrest frame <NUM>, and a handle assembly <NUM> is mounted on the other side. When the earth auger <NUM> is in a normal working state, the handle assembly <NUM> is located on the armrest frame <NUM> held by the operator's right hand. The handle assembly <NUM> includes a handle shell <NUM>, a starting unit <NUM>, a locking unit <NUM> and a reversing unit <NUM>. The handle shell <NUM> includes a top wall <NUM>, a bottom wall <NUM> and a side wall <NUM>. The bottom wall <NUM> is arranged opposite to the top wall <NUM>. The top wall <NUM>, the bottom wall <NUM> and the side wall <NUM> form a receiving cavity <NUM> for housing the starting unit <NUM>, the locking unit <NUM> and the reversing unit <NUM>. The starting unit <NUM> includes a trigger <NUM>, a starting micro switch <NUM> and a trigger reset elastic component <NUM>. The trigger <NUM> can be pivotally mounted on the handle shell <NUM> through a second pivot <NUM>, and the starting micro switch <NUM> is matched with the trigger <NUM>. The trigger <NUM> includes a handle arm <NUM> and a trigger arm <NUM>. The handle arm <NUM> and the trigger arm <NUM> are located on two sides of the second pivot <NUM> and the handle arm <NUM> passes through the side wall <NUM> of the handle shell <NUM> for user to operate. The handle arm <NUM> passes through the side wall <NUM> facing the driving assembly <NUM> which is convenient for the user to operate the handle arm <NUM> with the thumb when holding the handle assembly <NUM>. The trigger arm <NUM> is located in the receiving cavity <NUM> of the handle shell <NUM> and matches with the starting micro switch <NUM>. When the user pushes the handle arm <NUM>, the trigger arm <NUM> rotates around the second pivot <NUM> and resists the starting micro switch <NUM>, so that the starting micro switch <NUM> can be triggered. At this time, the trigger reset elastic component <NUM> will undergoes elastic deformation and the starting micro switch <NUM> can control the driving assembly <NUM>. When the starting micro switch <NUM> directly sends the starting signal to the driving assembly <NUM>, the starting micro switch <NUM> directly controls the driving component <NUM> to work. When the starting micro switch <NUM> sends a starting signal to the control unit and the control unit controls the driving assembly <NUM> to work, the start micro switch <NUM> indirectly controls the driving assembly <NUM> to work. When the handle arm <NUM> is released, the trigger <NUM> will be reset under the action of the trigger reset elastic component <NUM>.

Please refer to <FIG> and <FIG>, the locking unit <NUM> includes a locking handle <NUM> and a reset elastic component <NUM>, and the reset elastic component <NUM> matches with the locking handle <NUM>. The locking handle <NUM> can be pivotally mounted on the top wall <NUM> of the handle shell <NUM> through a third pivot <NUM>. The locking handle <NUM> includes a pushing arm <NUM> and a locking arm <NUM>. The pushing arm <NUM> and the locking arm <NUM> are located on two sides of the third pivot <NUM> and the pushing arm <NUM> passes through the top wall <NUM> of the handle shell <NUM> for user to operate. The locking arm <NUM> is located in the receiving cavity <NUM> of the handle shell <NUM> and matches with the trigger arm <NUM>.

Please refer to <FIG>, when the locking unit <NUM> is in the locked state, the locking arm <NUM> is in contact with the trigger arm <NUM>. At this time, the user cannot push the handle arm <NUM>, the starting unit <NUM> is locked by the locking unit <NUM> and the driving assembly <NUM> cannot be started. When the user pushes the pushing arm <NUM> to rotate around the third pivot <NUM>, the locking arm <NUM> also rotates around the third pivot <NUM> and is separated from the trigger arm <NUM>. At this time, the locking unit <NUM> is in the unlocked state and the user can push the handle arm <NUM> to start the driving assembly <NUM>.

Please refer to <FIG> and <FIG>, the reversing unit <NUM> includes a sliding rail <NUM>, a sliding block <NUM> and a reversing micro switch <NUM>. The sliding rail <NUM> is mounted on the side wall <NUM> of the handle shell <NUM>, the sliding block <NUM> is slidably mounted on the sliding rail <NUM>, and the reversing micro switch <NUM> matches with the sliding block <NUM>. In this embodiment, the reversing micro switch <NUM> can be located above the sliding direction of the sliding block <NUM>. When the user pushes the sliding block <NUM> to slide along the sliding rail <NUM>, the sliding block <NUM> is in contact with the reversing micro switch <NUM> and triggers the reversing micro switch <NUM> to work. At this time, the reversing micro switch <NUM> sends a reversing signal to the driving assembly <NUM> to control the driving assembly <NUM> to rotate forward or reverse. The handle assembly <NUM> guides the operator's hand to be in a grip state through the match of the starting unit <NUM> and the locking unit <NUM> and the positions of the match of the starting unit <NUM> and the locking unit <NUM> on the handle shell <NUM>, so that the operator can cope with sudden changes in large torques at any time, which cause the thumb triggering the trigger arm <NUM> can be easily released, thereby the earth auger is braked and powered off, and the safety risk caused by the failure to release the switch in time can be avoided.

Please refer to <FIG> and <FIG>, the drill pipe assembly <NUM> can be mounted on the driving assembly <NUM> so as to work under the drive of the driving assembly <NUM>. The drill pipe assembly <NUM> includes a drill pipe <NUM> and a splitter plate <NUM>. The splitter plate <NUM> is mounted at an end of the drill pipe <NUM> away from the driving assembly <NUM>. The drill pipe <NUM> includes a drill shaft <NUM> mounted on the driving assembly <NUM> and a spiral drill vane <NUM> mounted on the drill shaft <NUM>.

Please refer to <FIG> and <FIG>, the spiral angle of the spiral drill vane <NUM> can be α, the spiral distance can be P, and the drill diameter of the drill pipe assembly <NUM> is D, then the following relationship can be formed:
<MAT>.

Wherein, the center of the splitter plate <NUM> may be provided with a shaft hole matching with the drill shaft <NUM>, and the splitter plate <NUM> is mounted on the drill shaft <NUM> through the shaft hole. The splitter plate <NUM> includes a base plate <NUM> and a drainage unit <NUM>. The drainage <NUM> can be arranged on the base plate <NUM>. The base plate <NUM> can be in the shape of a circular flat plate, the diameter of the base plate <NUM> can be set to be equal or similar to the drill diameter D and the base plate <NUM> can be perpendicular to the drill shaft <NUM>. The drainage unit <NUM> includes a drainage port <NUM>, a drainage plate <NUM> and a blade <NUM>. The drainage port <NUM> is arranged on the base plate <NUM>, the drainage plate <NUM> is arranged on one side of the drainage port <NUM> and above the base plate <NUM>, and the blade <NUM> is arranged on the other side of the drainage port <NUM> and below the base plate <NUM>. The drainage plate <NUM> is formed by bending and extending the side of the drainage port <NUM> away from the blade <NUM> upward. In this embodiment, the drainage plate <NUM> and the base plate <NUM> are integrated, but in other embodiments, the drainage plate <NUM> can also be a separate part and can be mounted on the base plate <NUM>. The included angle β between the drainage plate <NUM> and the plane of the base plate <NUM> is not greater than <NUM> degrees.

Please refer to <FIG>, the spiral angle α of the spiral drill vane <NUM> is smaller than the included angle β. The base plate <NUM> is bent downward from the side of the drainage port <NUM> away from the drainage plate <NUM> to extend and form a mounting plate <NUM>, and the blade <NUM> is mounted on the mounting plate <NUM> by screws. In this embodiment, the blade <NUM> is a separate component, but in other embodiments, the blade <NUM> can also be integrated with the base plate <NUM>. In this embodiment, the drainage plate <NUM> and the mounting plate <NUM> are manufactured through stamping and forming of the base plate <NUM>. The included angle γ between the blade <NUM> and the base plate <NUM> ranges, for example, from <NUM> degrees to <NUM> degrees. In this embodiment, the included angle γ between the blade <NUM> and the base plate <NUM> can be, for example, <NUM> degrees.

Please refer to <FIG>, an end of the spiral drill vane <NUM> close to the base plate <NUM> is in contact with the base plate <NUM>. When the drill pipe assembly <NUM> is working, the soil and the like excavated by the blade <NUM> can be continuously discharged by the spiral drill vane <NUM>. A folded edge <NUM> of the drainage plate <NUM> away from the base plate <NUM> is tangent to the spiral drill vane <NUM>. When the drill pipe assembly <NUM> is reversed to withdraw from the borehole, the drainage plate <NUM> will cause that the direction of the friction force of the siltation soil to the drill pipe <NUM> changes, thereby facilitating the drill pipe assembly <NUM> to withdraw smoothly from the borehole. In this embodiment, the splitter plate <NUM> can be provided with two drainage units <NUM>. The two drainage units <NUM> can be symmetrical about the center of the drill shaft <NUM>, and each drainage unit <NUM> receives equal force, which is convenient for the user to keep the earth auger <NUM> in balance. The number of drainage units <NUM> can be set according to different structural requirements. When the number of drainage units <NUM> is greater than two, the drainage units <NUM> can be set to be rotationally symmetrical about the drill shaft <NUM>.

Please refer to <FIG> and <FIG>, the driving assembly <NUM> can be mounted on the supporting platform <NUM> to drive the drill pipe assembly <NUM> to work. The driving assembly <NUM> includes a driving motor <NUM>, a case <NUM>, an air deflector <NUM>, a gear box <NUM>, an output shaft <NUM>, a connecting seat <NUM>, a bearing <NUM> and a bearing seat <NUM>. The end of the driving motor <NUM> away from the connecting seat <NUM> can be provided with heat dissipation blades <NUM>, and the motor case of the driving motor <NUM> is provided with a screw hole <NUM>. The case <NUM> is mounted on the supporting platform <NUM> by screws, and matches with the connecting seat <NUM> to form an accommodating cavity <NUM>. The accommodating cavity <NUM> can be used to accommodate the driving motor <NUM>, the air deflector <NUM> and the gear box <NUM>. The case <NUM> is provided with a battery slot <NUM> and a partition <NUM>. The battery slot <NUM> is used for accommodating battery assemblies and powering the earth auger <NUM>. In this embodiment, the battery slot <NUM> is located on the side of the driving motor <NUM> close to the operator's position, so that the distance between the operator and the drill pipe assembly <NUM> is maximized, thereby ensuring the operator's safety. The battery slot <NUM> is symmetrical about the longitudinal plane where the AA axis is located (as shown in <FIG>). At this time, the center axis of the drill shaft <NUM> is located on the symmetry plane of the battery slot <NUM>, so that the weight of the battery assemblies on both sides of the symmetry plane is equal to each other, which is convenient for operator to keep the earth auger <NUM> in balance. The partition <NUM> abuts against the motor case of the driving motor <NUM> and matches with the air deflector <NUM> to divide the accommodating cavity <NUM> into an air inlet cavity <NUM> and an air outlet cavity <NUM>. The heat dissipation blades <NUM> of the driving motor <NUM> are accommodated in the air outlet cavity <NUM>, and the gear box <NUM> of the driving motor <NUM> is accommodated in the air inlet cavity <NUM>. An arc guide wall <NUM> is arranged on the side of the air deflector <NUM> facing the driving motor <NUM> to smoothly guide the hot air discharged from the heat dissipation blades <NUM> to the outside of the air outlet cavity <NUM> and reduce the wind resistance of the hot air in the air outlet cavity <NUM>. One end of the gear box <NUM> is matched with the driving motor <NUM> and the other end is matched with the output shaft <NUM> to transmit the power output by the driving motor <NUM> to the output shaft <NUM>. The shell of the gear box <NUM> is provided with a screw hole <NUM>. The connecting seat <NUM> can be configured in a truncated cone shape and partially penetrate the through hole <NUM>. The connecting seat <NUM> is mounted on the supporting platform <NUM> by screws and provided with a screw hole <NUM>. The bearing <NUM> can be set on the output shaft <NUM> and includes a first bearing <NUM> located in the gear box <NUM> and a second bearing <NUM> located in the bearing seat <NUM>. The output shaft <NUM> passes through the first bearing <NUM>, the second bearing <NUM> and the bearing seat <NUM>, and extends to the outside of the bearing seat <NUM> to match with the drill pipe assembly <NUM>. Since the first bearing <NUM> can be arranged in the gear box <NUM> and the second bearing <NUM> can be arranged in the bearing seat <NUM>, the distance between the first bearing <NUM> and the second bearing <NUM> can be maximized, which effectively ensures the output coaxiality of the output shaft <NUM>. The bearing seat <NUM> can be mounted at an end of the connecting seat <NUM> away from the driving motor <NUM> and can be provided with a screw hole <NUM>. The screw holes <NUM>, the screw holes <NUM>, the screw holes <NUM>, the screw holes <NUM> and the screws match together to connect the driving motor <NUM>, the gear box <NUM>, the connecting seat <NUM>, and the bearing seat <NUM> together to form a rigid overall structure, which effectively simplifies the assembly process.

Please refer to <FIG> and <FIG>, the connecting seat <NUM> can be provided with a torque transmission component <NUM> that matches with the torque bearing component <NUM>. When the earth auger <NUM> is working, the torque transmission component <NUM> matches with the torque bearing component <NUM> to bear at least part of the shear force between the supporting assembly <NUM> and the driving assembly <NUM>, which improves the safety performance of the earth auger <NUM> and reduces the safety problems caused by the fracture of the screw due to the long-term bearing of a large shearing force. The numbers of the torque transmission component <NUM> and the torque bearing component <NUM> can be set according to different structural requirements. When the numbers of the torque transmission component <NUM> and the torque bearing component <NUM> is not less than two, the torque transmission component <NUM> and the torque bearing component <NUM> are evenly distributed around the drill pipe assembly <NUM>. In this embodiment, the torque bearing component <NUM> can be a boss and the torque transmission component <NUM> can be a groove matching with the boss.

Please refer to <FIG> and <FIG>, the lighting assembly <NUM> can be mounted on the connecting seat <NUM> to illuminate the working area. The lighting assembly <NUM> includes a floodlight <NUM> and a lampshade <NUM>. The lampshade <NUM> passes through the lamp trough <NUM>, so that the light emitted by the floodlight <NUM> passes through the lamp trough <NUM> to illuminate the working area. In this embodiment, the numbers of the lighting assembly <NUM> and the torque bearing component <NUM> are, for example, three, and the lighting assembly <NUM> and the torque bearing component <NUM> are arranged at intervals and evenly distributed around the drill pipe assembly <NUM>.

Please refer to <FIG>, the brake assembly <NUM> can be mounted on the supporting platform <NUM>. In this embodiment, the brake assembly <NUM> can be mounted on the bottom of the supporting platform <NUM>, and in other embodiments of the disclosure, the brake assembly <NUM> can also be mounted on the top of the supporting platform <NUM>. The brake assembly <NUM> includes a trigger component <NUM> and a brake lever <NUM>. The trigger component <NUM> is used to brake the driving assembly <NUM>, and the brake lever <NUM> is pivotally mounted on the supporting platform <NUM> through the first pivot <NUM> and matches with the trigger component <NUM>. In this embodiment, the trigger component <NUM> is a micro switch to send a braking signal to the driving assembly <NUM>. A part of the projection of the brake lever <NUM> on a plane perpendicular to the axis of the drill shaft <NUM> is outside the projection of the supporting assembly <NUM> on a plane perpendicular to the axis of the drill shaft <NUM>, which means that when the drill shaft <NUM> is perpendicular to the horizontal plane, a part of the projection of the brake lever <NUM> on the horizontal plane is located on the side of the bracket <NUM> away from the drive assembly <NUM>. When the earth auger <NUM> is out of control due to a blocked rotation, as the earth auger <NUM> rotates, the brake lever <NUM> will abut against the operator's body. At this time, the trigger component <NUM> is triggered to work and then the driving assembly <NUM> is controlled to brake. In this embodiment, when the earth auger <NUM> is viewed from above, the drill pipe <NUM> of the earth auger <NUM> rotates clockwise and the brake lever <NUM> can be located on the left side of the operator which means under the left armrest frame <NUM>. When the earth auger <NUM> is out of control due to blocked drill, the supporting assembly <NUM> rotates counterclockwise so that the brake lever <NUM> is in contact with the operator's body and slides clockwise to make the trigger component <NUM> be in a working state. In this way, the earth auger <NUM> can stop working under the action of the brake assembly <NUM>. The drill pipe <NUM> of the earth auger <NUM> can also be set to rotate counterclockwise and the brake lever <NUM> can be located below the armrest frame <NUM> on the right side of the operator.

Please refer to <FIG>, the brake lever <NUM> includes a rigid lever <NUM> and a flexible lever <NUM>. The flexible lever <NUM> is located at an end of the rigid lever <NUM> away from the first pivot <NUM> to prevent the brake lever <NUM> from causing damage to the operator when the earth auger <NUM> is out of control due to the blocked rotation. The projection of the rigid lever <NUM> on the plane perpendicular to the axis of the drill shaft <NUM> is located inside the projection of the supporting assembly <NUM> on the plane perpendicular to the axis of the drill shaft <NUM>, which means that when the drill shaft <NUM> is perpendicular to the horizontal plane, the projection of the rigid lever <NUM> on the horizontal plane is located on the side of the bracket <NUM> close to the driving assembly <NUM>. The projection of the flexible lever <NUM> on the plane perpendicular to the drill axis <NUM> is the first projection, and the projection of the supporting assembly <NUM> on the plane perpendicular to the drill axis <NUM> is the second projection. The first projection is at least partially outside the second projection. The part of the first projection outside the second projection is on one side of the operator. In other embodiments of the disclosure, the flexible lever <NUM> can also be directly covered on the rigid lever <NUM>. In this embodiment, the rigid lever <NUM> bends and extends from the end close to the supporting platform <NUM> to the end close to the flexible lever <NUM>, so that the rigid lever <NUM> is, for example, Z-shaped. The rigid lever <NUM> is provided with a resisting arm <NUM> that matches the trigger component <NUM>, and the resisting arm <NUM> and the flexible lever <NUM> are located on different sides of the first pivot <NUM>. In other embodiments of the disclosure, the resisting arm <NUM> and the flexible lever <NUM> can also be located on the same side of the first pivot <NUM>. The supporting platform <NUM> can also be provided with a limiting component <NUM> that matches with the brake lever <NUM> to limit the rotation range of the brake lever <NUM>. The brake assembly <NUM> can also be provided with a first elastic component (not shown) that matches with the brake lever <NUM>. When the earth auger <NUM> is viewed from above, the drill pipe <NUM> of the earth auger <NUM> rotates in a clockwise direction.

Please refer to <FIG> and <FIG>, when the brake lever <NUM> is in the first state, the brake lever <NUM> is in contact with the trigger component <NUM>. At this time, the trigger component <NUM> controls the driving assembly <NUM> to brake. The moving range of the brake lever <NUM> is between the N position and the M position (as shown in <FIG>). The first elastic component undergoes elastic deformation, and the brake lever <NUM> is at the N position at this time. When the brake lever <NUM> is released, the brake lever <NUM> is reset under the action of the first elastic component. At this time, the brake lever <NUM> is in the second state, it is separated from the trigger component <NUM> and is in the M position. In other embodiments of the disclosure, the brake lever <NUM> can also be configured such that the rigidity of the brake lever <NUM> gradually decreases from the end close to the supporting platform <NUM> to the end away from the supporting platform <NUM>. When the brake lever <NUM> is in contact with the operator due to blocked rotation, since the rigidity of the part of the brake lever <NUM> in contact with the operator is relatively small, it will not cause injury to the operator when it is braked.

Please refer to <FIG>, it shows a handle assembly <NUM> in another embodiment of the disclosure. The handle assembly <NUM> includes a handle shell <NUM>, a starting unit <NUM>, a locking unit <NUM> and a reversing unit <NUM>. The handle arm <NUM> of the trigger <NUM> penetrates the bottom wall <NUM> of the handle shell <NUM> for the user to hold. The trigger arm <NUM> of the trigger <NUM> is located in the handle shell <NUM> and matches with the starting micro switch <NUM>. The pushing arm <NUM> of the locking handle <NUM> passes through the top wall <NUM> of the handle shell <NUM> for the user to operate, and the locking arm <NUM> of the locking handle <NUM> is located in the handle shell <NUM> and matches with the trigger arm <NUM>. An end of the locking arm <NUM> close to the trigger arm <NUM> can be provided with a buckle part <NUM>. When the locking unit <NUM> is in the locked state, the buckle part <NUM> buckles the end of the trigger arm <NUM> away from the second pivot <NUM>. When the locking unit <NUM> is in the unlocked state, the buckle part <NUM> and the trigger arm <NUM> are separated. A guide wall <NUM> is provided on the side of the trigger arm <NUM> facing the buckle part <NUM>. When the trigger <NUM> is in the open state, the buckle part <NUM> is in contact with the guide wall <NUM>. When the trigger <NUM> is converted from the open state to the closed state, the buckle part <NUM> slides along the guide wall <NUM>, so that the trigger <NUM> is reset. The reversing micro switch <NUM> is located below the sliding direction of the sliding block <NUM>.

Please refer to <FIG> is a handle assembly <NUM> according to yet another embodiment of the disclosure. The handle assembly <NUM> includes a locking unit <NUM>. The locking unit <NUM> includes a locking handle <NUM> slidably mounted on the handle shell <NUM> and a reset elastic component <NUM>.

Please refer to <FIG>, the locking handle <NUM> includes a pushing arm <NUM> and a locking arm <NUM>. The pushing arm <NUM> passes through the side wall <NUM> of the handle shell <NUM> for the user to operate. The locking arm <NUM> is located in the handle shell <NUM> and matches with the handle arm <NUM>. The locking arm <NUM> is provided with a limiting part <NUM> and a relief groove <NUM>. When the locking unit <NUM> is in the locked state, the limiting part <NUM> is in contact with the handle arm <NUM> so that the trigger <NUM> cannot rotate around the second pivot <NUM>. When the locking unit <NUM> is in the unlocked state, the relief groove <NUM> faces the trigger <NUM> so that the trigger <NUM> can rotate around the second pivot <NUM>.

The earth auger provided by the disclosure can passively trigger the brake assembly when the earth auger is out of control due to the blocked rotation, thereby effectively avoiding accidents and improving operational safety. In summary, the disclosure has provides following beneficial effects: when the earth auger is out of control due to the blocked rotation, the brake assembly is passively triggered, which effectively avoids accidents and improves operational safety.

The above description is only a preferred embodiment of the disclosure and an explanation of the applied technical principles, and those skilled in the art should understand that the scope of the disclosure is not limited to the technical solution formed by the specific combination of the above technical features such as the technical solution formed through the features mentioned above replaced by the technical features disclosed in this disclosure (but not limited to) with similar functions and that the invention is described by the appended claims.

Claim 1:
An earth auger (<NUM>), comprising:
a supporting assembly (<NUM>), comprising a supporting platform (<NUM>) on which a torque bearing component (<NUM>) is arranged,
a drill pipe assembly (<NUM>) including a drill pipe (<NUM>),
a driving assembly (<NUM>) arranged on the supporting assembly (<NUM>) to drive the drill pipe assembly to work, comprising:
- a connecting seat (<NUM>) arranged on the supporting platform (<NUM>),
- a torque transmission component (<NUM>) arranged on the connecting seat (<NUM>) and matching the torque bearing component (<NUM>) to bear at least part of the shear force between the supporting assembly (<NUM>) and the driving assembly (<NUM>),
- a case (<NUM>) arranged on the supporting platform (<NUM>), and
- a driving motor (<NUM>) arranged on the supporting platform (<NUM>), and the earth auger (<NUM>) further comprising
a brake assembly (<NUM>) including a trigger component (<NUM>) that brakes the driving assembly (<NUM>) and a brake lever (<NUM>) connected through a first pivot (<NUM>) and matched with the trigger component (<NUM>), wherein a projection part of the brake lever (<NUM>) on a plane perpendicular to an axis of the drill pipe (<NUM>) is located outside a projection of the supporting assembly (<NUM>) on the plane perpendicular to the axis of the drill pipe (<NUM>),
characterized in that
the earth auger (<NUM>) further comprises an air deflector (<NUM>) and a partition (<NUM>) being arranged in the case (<NUM>), and
the driving motor (<NUM>) is provided with heat dissipation blades (<NUM>) located at an end away from the drill pipe assembly.