SANDING TOOL AND BELT SANDER

Abstract

A sanding tool includes a body and a battery pack. The body includes a housing formed with a battery pack coupling portion, a main handle connected to the housing, a sanding assembly connected to the housing with a base plate, where the base plate forms a support plane; and an electric motor in the housing. The mounting surface of the battery pack is at least partially disposed between the electric motor and the main handle. The projection point of the center of gravity of the whole machine on an extended surface of the support plane is located within the support plane of the base plate. Along the front and rear direction of the housing, the base plate has a first centerline, and the distance from the projection point to the first centerline is greater than or equal to 0 mm and less than or equal to 38 mm.

Description

RELATED APPLICATION INFORMATION

This application claims the benefit under 35 U.S.C. § 119(a) of Chinese Patent Application No. 202311133014.6 filed on Sep. 4, 2023, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present application relates to a sanding tool and belt sander.

BACKGROUND

A sanding tool in the related art drives, through a motor, a sanding member to rotate to polish and sand the surfaces of materials such as wood, plastic, stone, and metal. While implementing a sanding function, a handheld sanding tool generally should also have a relatively small volume and weight to satisfy the expectation of a user for a convenient operation and improve user experience. However, as the power of the sanding tool increases, a motor disposed in the sanding tool generally has a relatively large volume, causing the volume of the entire sanding tool to become larger. After the battery pack is mounted, the weight of the whole machine increases. When the user holds the sanding tool in hand, the sanding member is in surface contact with the sanded member. Due to the larger volume and weight of the whole machine, it is difficult to ensure the stability of the sanding tool during use, resulting in a poor sanding effect.

This part provides background information related to the present application. The background information is not necessarily the existing art.

SUMMARY

A sanding tool includes a body and a battery pack. The body includes a housing formed with a battery pack coupling portion, where the battery pack is detachably disposed on the battery pack coupling portion, and the battery pack coupling portion has a mounting surface for mounting the battery pack; a main handle connected to the housing; a sanding assembly connected to the housing and including a base plate, where the base plate forms a support plane; and an electric motor disposed in the housing and used for driving the sanding assembly to operate. The mounting surface of the battery pack is at least partially disposed between the electric motor and the main handle. When the battery pack is mounted on the battery pack coupling portion, the body and the battery pack form a whole machine, and the projection point of the center of gravity of the whole machine on an extended surface of the support plane is located within the support plane of the base plate. Along the front and rear direction of the housing, the base plate has a first centerline, and the distance D from the projection point to the first centerline is greater than or equal to 0 mm and less than or equal to 38 mm.

In some examples, the distance D from the projection point to the first centerline is less than or equal to 25 mm.

In some examples, the projection point of the center of gravity of the battery pack on the extended surface of the support plane is basically located within the support plane.

In some examples, the battery pack is capable of being coupled to the battery pack coupling portion along the direction of a first straight line, and the first straight line is parallel to the extended surface of the support plane.

In some examples, the battery pack is capable of being coupled to the battery pack coupling portion along the direction of a first straight line, and the first straight line obliquely intersects with the extended surface of the support plane.

In some examples, the battery pack is capable of being coupled to the battery pack coupling portion along the direction of a first straight line, a plane where the mounting surface is located is perpendicular to the extended surface of the support plane, and the first straight line is perpendicular to the support plane.

In some examples, a plane where the mounting surface is located obliquely intersects with or is parallel to the extended surface of the support plane.

In some examples, the sanding assembly further includes a speed regulation switch configured to control the rotational speed of the electric motor and disposed on a first grip of the main handle.

In some examples, the electric motor rotates about a motor axis, the battery pack is coupled to the mounting surface of the battery pack along the direction of a first straight line, and the direction of the first straight line is basically perpendicular to the direction of the motor axis.

In some examples, the main handle includes a first grip, and a rear end of the first grip extends obliquely downward relative to the housing.

In some examples, the distance between the rear end of the first grip and the extended surface of the support plane is less than or equal to 50 mm.

In some examples, a trigger is disposed on the first grip, and the distance between the trigger and the extended surface of the support plane is less than or equal to 80 mm.

In some examples, the sanding assembly further includes a drive wheel and a driven wheel, the drive wheel is located on a rear side of the base plate, the driven wheel is located on a front side of the base plate, and a sanding member is sleeved on the drive wheel and the driven wheel; and a trigger is disposed on the first grip, and along the direction perpendicular to the support plane, the trigger is located between the highest point of the drive wheel and the center of gravity of the battery pack.

In some examples, the trigger is located behind the drive wheel along the front and rear direction of the housing.

In some examples, the trigger is basically located in the middle of the base plate along the left and right direction of the housing.

A sanding tool includes a body and a battery pack. The body includes a housing formed with a battery pack coupling portion, where the battery pack is detachably disposed on the battery pack coupling portion, and the battery pack coupling portion has a mounting surface for mounting the battery pack; a main handle connected to the housing; a sanding assembly connected to the housing and including a base plate, where the base plate forms a support plane; and an electric motor disposed in the housing and used for driving the sanding assembly to operate. The electric motor is at least partially located between the mounting surface and the main handle. When the battery pack is mounted on the battery pack coupling portion, the body and the battery pack form a whole machine, and the projection point of the center of gravity of the whole machine on an extended surface of the support plane is located within the support plane of the base plate. Along the front and rear direction of the housing, the base plate has a first centerline, and the distance D from the projection point to the first centerline is greater than or equal to 0 mm and less than or equal to 38 mm.

A belt sander includes a body and a battery pack. The body includes a housing formed with a battery pack coupling portion, where the battery pack is detachably disposed on the battery pack coupling portion, and the battery pack coupling portion has a mounting surface for mounting the battery pack; a main handle connected to the housing; a sanding assembly connected to the housing and including a base plate, where the base plate forms a support plane; and an electric motor disposed in the housing and used for driving the sanding assembly to operate. The electric motor is at least partially located between the mounting surface and the main handle. When the battery pack is mounted on the battery pack coupling portion, the body and the battery pack form a whole machine, and the projection point of the center of gravity of the whole machine on an extended surface of the support plane is located within the support plane of the base plate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural view of a sanding tool according to the present application.

FIG. 2 is a front view of a sanding tool according to the present application.

FIG. 3 is structural view one of a sanding tool with some structures omitted according to the present application.

FIG. 4 is structural view two of a sanding tool with some structures omitted according to the present application.

FIG. 5 is an exploded view of a sanding tool according to the present application.

FIG. 6 is a perspective view of a sanding tool with a sanding member removed according to the present application.

FIG. 7 is a structural view of another sanding tool according to the present application.

FIG. 8 is a structural view of another sanding tool according to the present application.

DETAILED DESCRIPTION

Before any example of the present application is explained in detail, it is to be understood that the present application is not limited to its application to the structural details and the arrangement of components set forth in the following description or illustrated in the preceding drawings.

In the present application, the terms “comprising”, “including”, “having”, or any other variation thereof are intended to cover an inclusive inclusion such that a process, method, article, or device including a series of elements includes not only those series of elements, but also other elements not expressly listed, or elements inherent in the process, method, article, or device. In the absence of more restrictions, the elements defined by the statement “including a . . . ” do not exclude the presence of additional identical elements in the process, method, article, or device that includes the elements.

In the present application, the term “and/or” is an association relationship describing associated objects and indicates that three relationships may exist. For example, A and/or B may indicate that A exists alone, both A and B exist, and B exists alone. In addition, in the present application, the character “/” generally indicates an “and/or” relationship between associated objects before and after the character “/”.

In the present application, the terms “connection”, “combination”, “coupling”, and “mounting” may be direct connection, combination, coupling, or mounting and may also be indirect connection, combination, coupling, or mounting. Among them, for example, direct connection means that two parts or assemblies are connected together without intermediate pieces, and indirect connection means that two parts or assemblies are separately connected to at least one intermediate piece and the two parts or assemblies are connected to each other by the at least one intermediate piece. In addition, “connection” and “coupling” are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

In the present application, it is to be understood by those of ordinary skill in the art that a relative term (for example, “about”, “approximately”, or “basically”) used in conjunction with quantities or conditions is inclusive of the stated value and has the meaning indicated by the context. For example, the relative term includes at least a degree of error associated with the measurement of a particular value, a tolerance caused by manufacturing, assembly, and use associated with the particular value, and the like. Such relative term should also be considered as disclosing the range defined by the absolute values of the two endpoints. The relative term may refer to plus or minus a certain percentage (such as 1%, 5%, 10%, or more) of an indicated value. A value not modified by the relative term should also be disclosed as a particular value with a tolerance. In addition, when expressing a relative angular position relationship (for example, basically parallel or basically perpendicular), “basically” may refer to plus or minus a certain degree (such as 1 degree, 5 degrees, 10 degrees, or more) based on an indicated angle.

In the present application, it is to be understood by those of ordinary skill in the art that the function implemented by an assembly may be implemented by one assembly, multiple assemblies, one part, or multiple parts. Similarly, a function implemented by a part may be implemented by one part, one assembly, or a combination of parts.

In the present application, the terms “upper”, “lower”, “left”, “right”, “front”, “rear”, and other orientation words are described by the orientations and position relations shown in the drawings and should not be understood as a limitation to the examples of the present application. In addition, in this context, it also needs to be understood that when it is mentioned that an element is connected “above” or “below” another element, the element not only can be directly connected “above” or “below” the other element but also can be indirectly connected “above” or “below” the other element through an intermediate element. Further, it should be understood that orientation words such as the upper side, lower side, left side, right side, front side, and rear side not only represent perfect orientations but also may be understood as lateral orientations. For example, the lower part may include directly below, lower left, lower right, lower front, and lower back.

As shown in FIGS. 1 to 4, this example provides a sanding tool. The sanding tool can be used for grinding a workpiece to make the surface of the workpiece smooth. The sanding tool includes a body 100 and a battery pack 200. The body 100 includes a housing 110, a main handle 120, and a sanding assembly 130. The housing 110 is formed with a coupling portion of the battery pack 200. The battery pack 200 is detachably disposed on a battery pack coupling portion 111. The main handle 120 is connected to the housing 110. The sanding assembly 130 is connected to the housing 110.

The housing 110 forms the main housing portion of the sanding tool, and most devices of the sanding tool are connected to the housing 110 or disposed inside the housing 110. The housing 110 is formed with a first accommodation space. The first accommodation space refers to a closed or incompletely closed space formed by the housing 110 and is used for placing corresponding components. The first accommodation space is continuous with the housing 110.

The sanding tool further includes an electric motor 140 disposed in the housing 110. Specifically, the electric motor 140 is disposed in the first accommodation space of the housing 110. The electric motor 140 is used for providing power for the operation of the sanding assembly 130. The electric motor 140 is a general term for any device supplying power through electrical energy. Preferably, the electric motor 140 is an electric motor unit. It is also conceivable that the electric motor 140 may also be other configurations that can be easily thought of by those skilled in the art, such as a pneumatic motor, an internal combustion engine, and a hybrid motor. The electric motor 140 is connected to the sanding assembly 130 through a transmission device. The electric motor 140 is basically fixedly disposed in the first accommodation space. The housing 110 corresponding to the first accommodation space surrounds the electric motor 140 and has basically the same shape as the electric motor 140.

The sanding tool further includes a control board 150 disposed in the housing 110. Specifically, the control board 150 is disposed in the first accommodation space of the housing 110. The control board 150 is electrically connected to the electric motor 140 and can be electrically connected to the battery pack 200. The battery pack 200 supplies power to the electric motor 140 through the control board 150. A trigger 160 is disposed on the main handle 120, and the trigger 160 is electrically connected to the control board 150 to control the start and stop of the electric motor 140.

The sanding assembly 130 may have different structures according to different types of sanding tools. As shown in FIG. 5, the sanding assembly 130 includes a base plate 131 and a sanding member 132. A support plane 1311 is formed on the base plate 131. The base plate is used for supporting the sanding member 132. The sanding member 132 is used for sanding the workpiece. The support plane 1311 is particularly defined as the largest contact surface between the base plate 131 and the sanding member 132 when the sanding tool is in the most common posture. In this example, the base plate 131 is basically rectangular, and the support plane 1311 is the largest plane of the base plate 131. The extended surface of the support plane 1311 refers to the extendable virtual plane A1 where the support plane 1311 is located.

The sanding member 132 is a strip-like structure with a rough surface and a sanding function. The electric motor 140 can drive the sanding member 132 to operate, and the electric motor 140 is configured to be rotatable about a motor axis 146. Specifically, the sanding assembly 130 further includes a drive wheel 133 and a driven wheel 134. The drive wheel 133 is located on the rear side of the base plate 131, the driven wheel 134 is located on the front side of the base plate 131, and the sanding member 132 is sleeved on the drive wheel 133 and the driven wheel 134. The electric motor 140 is used for driving the drive wheel 133 to rotate so that the sanding member 132 rotates about the drive wheel 133 and the driven wheel 134 to achieve sanding. The electric motor 140 may directly drive the drive wheel 133 to rotate or may drive the drive wheel 133 through a transmission mechanism.

In this example, the front and rear direction, the left and right direction, and the up and down direction of the housing 110 are defined, the main handle 120 is located on the rear side of the housing 110, and an auxiliary handle 170 is further disposed on the front side of the housing 110. The sanding assembly 130 is located at the bottom of the housing 110, and the battery pack 200 is disposed above the sanding assembly 130 and is easy to mount and disassemble.

The battery pack 200 is detachable. When the battery pack 200 is mounted on the battery pack coupling portion 111, the body 100 and the battery pack 200 form a whole machine, and the projection point of the center of gravity G1 of the whole machine on the extended surface of the support plane 1311 is located within the support plane 1311 of the base plate 131. In this manner, the center of gravity G1 is stable. Therefore, when the user performs the sanding operation, the center of gravity G1 of the whole machine falls within the boundary of the base plate 131, and the support plane 1311 of the base plate 131 is in parallel contact with the sanded plane of the workpiece as much as possible so that the case where the sanded plane is uneven due to the sanding tool rocking back and forth does not occur. On the other hand, when the user operates a sanding tool to sand the workpiece, to avoid uneven sanding due to the sanding tool rocking back and forth, the user applies an external force to the sanding tool to make the support plane 1311 of the sanding tool in parallel contact with the sanded plane as much as possible. After a long time, the user feels very tired. Through the preceding arrangement, while the sanding effect of the sanding tool is ensured, the force applied by the hand of the user is reduced so that the sanding tool is convenient for the user to operate.

Referring to FIGS. 5 and 6, along the front and rear direction of the housing 110, the base plate 131 has a first centerline 102, the center of gravity G1 of the whole machine has a projection point G3 on the extended surface of the support plane 1311, and the distance D from the projection point G3 to the first centerline 102 is greater than or equal to 0 mm and less than or equal to 38 mm. That is to say, the projection point G3 of the center of gravity G1 of the whole machine basically falls on the left or right side less than 38 mm away from the first centerline. In this manner, the center of gravity G1 of the whole machine is as close to the first centerline 102 of the base plate as possible. Through the preceding arrangement, the forces applied to the base plate 131 are balanced so that the front end of the base plate 131 can be prevented from rising up during use, and uneven sanding due to the sanding tool rocking back and forth can be avoided, thereby ensuring the stable operation of the sanding tool and improving the sanding effect of the sanding tool. Further, the distance D from the projection point G3 to the first centerline 102 is greater than or equal to 0 mm and less than or equal to 25 mm. When the distance D from the projection point G3 to the first centerline 102 is set within the preceding range, the sanding effect is better and the user saves more effort. In this manner, when the user holds the sanding tool to sand the workpiece, the user only needs to pay attention to the condition of the plane to be sanded and control the sanding tool to sand the workpiece so that the sanding tool is convenient for the user to operate and the sanding effect of the sanding tool can be improved. The first centerline 102 is basically located in the middle of the base plate 131, that is, along the left and right direction, the first centerline 102 is basically located in the middle of the width direction of the base plate 131.

The battery pack coupling portion 111 has a mounting surface for mounting the battery pack 200, the mounting surface is in surface contact with the battery pack 200, and the mounting surface obliquely intersects with, is perpendicular to, or is parallel to the extended surface A1 of the support plane 1311. That is to say, the battery pack 200 can be provided vertically, horizontally, or obliquely to adapt to various shape requirements of the housing 110.

In some examples, as shown in FIG. 2, the mounting surface extends along the vertical direction, A2 denotes the mounting surface, and the mounting surface is perpendicular to the extended surface of the support plane 1311. Further, the mounting surface is perpendicular to the support plane 1311.

The battery pack 200 can be coupled to the battery pack coupling portion 111 along the direction of a first straight line, and the first straight line is parallel to the mounting surface. In the drawing, O1 denotes the first straight line. In some examples, as shown in FIG. 2, the first straight line is parallel to the mounting surface, the first straight line is perpendicular to the extended surface of the support plane 1311, the first straight line extends along the vertical direction, and the battery pack 200 is inserted from top to bottom. In other examples, as shown in FIG. 7, the first straight line extends along the horizontal direction, and the battery pack 200 is inserted from front to rear. If space permits, the battery pack 200 can be inserted and removed along the left and right direction. In other examples, as shown in FIG. 8, the mounting surface extends along the vertical direction, the mounting surface is perpendicular to the extended surface of the support plane 1311, the first straight line is parallel to the extended surface of the support plane 1311, the first straight line extends along the horizontal direction, and the battery pack 200 can be inserted and removed along the left and right direction.

In some examples, the first straight line O1 is parallel to, obliquely intersects with, or is perpendicular to the extended surface A1 of the support plane so that the battery pack can be horizontally inserted into the battery pack coupling portion 111 along the front and rear direction or the left and right direction, the battery pack can also be obliquely inserted into the battery pack coupling portion 111 at multiple angles, for example, along the forward tilt direction, the rearward tilt direction, the left tilt direction, and the right tilt direction, and the battery pack can also be inserted into the battery pack coupling portion 111 along the up and down direction.

When the battery pack 200 is mounted on the mounting surface of the battery pack along the direction of the first straight line O1 and the direction of the first straight line O1 is basically perpendicular to the motor axis 146 of the electric motor 140, the opening direction of the battery pack coupling portion 111 is toward the main handle 120. In this manner, no matter whether the battery pack coupling portion 111 is coupled to a battery pack with a larger battery capacity or a battery pack with a smaller capacity, the projection point of the center of gravity of the whole machine on the support plane 1311 can be as close to the first centerline 102 as possible.

When the battery pack is mounted to the battery pack coupling portion 111, the projection point of the center of gravity G2 of the battery pack 200 on the extended surface of the support plane 1311 is located within the support plane 1311 of the base plate 131, thereby ensuring the stability of the position of the battery pack 200 and avoiding imbalance during use. In actual operation, according to different working conditions, the user selects battery packs 200 of different capacities for sanding. It is to be understood that different capacities of the battery packs 200 correspond to different weights of the battery packs 200. The weight of the battery pack 200 is relatively large compared to the weight of the body of the sanding tool. Therefore, the weight of the battery pack 200 affects the center of gravity G1 of the whole machine. Through the preceding setting of the battery pack coupling portion 111, regardless of the capacity of the battery pack 200 selected by the user or the angle at which the battery pack 200 is inserted into the battery pack coupling portion 111, the projection of the center of gravity G2 of the battery pack mounted on the body on the extended surface of the support plane 1311 can be within the support plane of the base plate.

As shown in FIG. 2, the battery pack 200 is at least partially disposed between the electric motor 140 and the main handle 120. In other examples, as shown in FIGS. 7 and 8, the electric motor 140 is at least partially disposed between the battery pack 200 and the main handle 120. The layout of the battery pack 200, the electric motor 140, and the main handle 120 ensures that the projection of the center of gravity of the whole machine on the support plane 1311 is located within the boundary of the base plate 131 and is basically located in the middle of the base plate 131 so that it can be ensured that the projection of the center of gravity of the battery pack 200 on the support plane 1311 is located within the boundary of the base plate 131.

As shown in FIG. 2, the main handle 120 includes a first grip 121, and the rear end of the first grip 121 extends obliquely downward relative to the housing 110 so that a forward and downward force can be applied to the main handle 120 when the main handle 120 is held, thereby preventing the tool from tilting during operation.

Specifically, the distance between the rear end of the first grip 121 and the extended surface of the support plane 1311 is less than or equal to 50 mm. In FIG. 2, L1 denotes the distance between the rear end of the first grip 121 and the support plane 1311. In some examples, the distance between the rear end of the first grip 121 and the extended surface of the support plane 1311 is 50 mm, 40 mm, 30 mm, 20 mm, or the like. In this manner, the sanding tool occupies less space in the height direction of the whole machine, making the sanding tool more convenient.

The trigger 160 is disposed on the first grip 121, and the distance between the trigger 160 and the extended surface of the support plane 1311 is less than or equal to 80 mm. In FIG. 2, L2 denotes the distance between the trigger 160 and the extended surface of the support plane 1311. In some examples, the distance between the trigger 160 and the extended surface of the support plane 1311 is 80 mm, 70 mm, 60 mm, 50 mm, or the like. In this manner, the sanding tool occupies less space in the height direction of the whole machine, making the sanding tool more convenient.

Along the direction perpendicular to the extended surface of the support plane 1311, the trigger 160 is located between the highest point of the drive wheel 133 and the center of gravity of the battery pack 200. The trigger 160 is disposed at such a position that the trigger 160 is convenient to hold. Since the trigger 160 is lower than the center of gravity of the battery pack 200 and higher than the drive wheel 133, it is easy to keep balance during holding.

In some examples, the trigger 160 is located behind the drive wheel 133 along the front and rear direction of the housing 110. In some examples, the trigger 160 is basically located in the middle of the base plate 131 along the left and right direction of the housing 110. The preceding arrangements are all to ensure the balance of the whole machine.

A first connecting portion 122 is disposed at an end of the first grip 121 facing the housing 110. The first connecting portion 122 is integrally formed with or detachably connected to the housing 110. The first grip 121 extends basically along a second straight line, the first connecting portion 122 extends basically along a third straight line, and the included angle between the second straight line and the third straight line is an acute angle. In FIG. 2, 02 denotes the second straight line, and Q3 denotes the third straight line.

The sanding tool is further provided with a speed regulation switch 123 for controlling the rotational speed of the electric motor 140. The speed regulation switch 123 is disposed on the first connecting portion 122. In this manner, while the user holds the first grip 121, the user can toggle the speed regulation switch 123, making it convenient for the user to operate.

In the present application, the sanding tool may be a belt sander.

The basic principles, main features, and advantages of the present application are shown and described above. It is to be understood by those skilled in the art that the preceding examples do not limit the present application in any form, and all technical solutions obtained through equivalent substitutions or equivalent transformations fall within the scope of the present application.

Claims

1. A sanding tool, comprising:

a body; and

a battery pack,

wherein the body comprises a housing formed with a battery pack coupling portion where the battery pack coupling portion has a mounting surface for detachably mounting the battery pack, a main handle connected to the housing, a sanding assembly connected to the housing and comprising a base plate where the base plate forms a support plane, and an electric motor disposed in the housing and used for driving the sanding assembly to operate, a mounting surface of the battery pack is at least partially disposed between the electric motor and the main handle, when the battery pack is mounted on the battery pack coupling portion, the body and the battery pack form a whole machine, a projection point of a center of gravity of the whole machine on an extended surface of the support plane is located within the support plane of the base plate, along a front and rear direction of the housing the base plate has a first centerline, and a distance D from the projection point to the first centerline is greater than or equal to 0 mm and less than or equal to 38 mm.

2. The sanding tool of claim 1, wherein the distance D from the projection point to the first centerline is less than or equal to 25 mm.

3. The sanding tool of claim 1, wherein the projection point of the center of gravity of the battery pack on the extended surface of the support plane is basically located within the support plane.

4. The sanding tool of claim 1, wherein the battery pack is capable of being coupled to the battery pack coupling portion along a direction of a first straight line, and the first straight line is parallel to the extended surface of the support plane.

5. The sanding tool of claim 1, wherein the battery pack is capable of being coupled to the battery pack coupling portion along a direction of a first straight line, and the first straight line obliquely intersects with the extended surface of the support plane.

6. The sanding tool of claim 1, wherein the battery pack is capable of being coupled to the battery pack coupling portion along a direction of a first straight line, a plane where the mounting surface is located is perpendicular to the extended surface of the support plane, and the first straight line is perpendicular to the support plane.

7. The sanding tool of claim 1, wherein a plane where the mounting surface is located obliquely intersects with or is parallel to the extended surface of the support plane.

8. The sanding tool of claim 1, wherein the sanding assembly further comprises a speed regulation switch configured to control a rotational speed of the electric motor disposed on a first grip of the main handle.

9. The sanding tool of claim 1, wherein the electric motor rotates about a motor axis, the battery pack is coupled to the mounting surface of the battery pack along a direction of a first straight line, and the direction of the first straight line is basically perpendicular to a direction of the motor axis.

10. The sanding tool of claim 1, wherein the main handle comprises a first grip, and a rear end of the first grip extends obliquely downward relative to the housing.

11. The sanding tool of claim 10, wherein a distance between the rear end of the first grip and the extended surface of the support plane is less than or equal to 50 mm.

12. The sanding tool of claim 10, wherein a trigger is disposed on the first grip, and a distance between the trigger and the extended surface of the support plane is less than or equal to 80 mm.

13. The sanding tool of claim 10, wherein the sanding assembly further comprises a drive wheel and a driven wheel, the drive wheel is located on a rear side of the base plate, the driven wheel is located on a front side of the base plate, a sanding member is sleeved on the drive wheel and the driven wheel, a trigger is disposed on the first grip, and, along a direction perpendicular to the support plane, the trigger is located between a highest point of the drive wheel and a center of gravity of the battery pack.

14. The sanding tool of claim 13, wherein the trigger is located behind the drive wheel along the front and rear direction of the housing.

15. The sanding tool of claim 13, wherein the trigger is basically located in a middle of the base plate along a left and right direction of the housing.

16. The sanding tool of claim 1, wherein the electric motor is at least partially located between the mounting surface and the main handle.

17. A sanding tool, comprising:

a body; and

a battery pack,

wherein the body comprises a housing formed with a battery pack coupling portion where the battery pack coupling portion has a mounting surface for detachably mounting the battery pack, a main handle connected to the housing, a sanding assembly connected to the housing and comprising a base plate where the base plate forms a support plane, and an electric motor disposed in the housing and used for driving the sanding assembly to operate, the electric motor is at least partially located between the mounting surface and the main handle, when the battery pack is mounted on the battery pack coupling portion, the body and the battery pack form a whole machine, a projection point of a center of gravity of the whole machine on an extended surface of the support plane is located within the support plane of the base plate, along a front and rear direction of the housing, the base plate has a first centerline, and a distance D from the projection point to the first centerline is greater than or equal to 0 mm and less than or equal to 38 mm.

18. The sanding tool of claim 17, wherein the distance D from the projection point to the first centerline is less than or equal to 25 mm.

19. The sanding tool of claim 17, wherein the projection point of the center of gravity of the battery pack on the extended surface of the support plane is basically located within the support plane.

20. A belt sander, comprising:

a body; and

a battery pack,

wherein the body comprises a housing formed with a battery pack coupling portion where the battery pack coupling portion has a mounting surface for mounting the battery pack, a main handle connected to the housing, a sanding assembly connected to the housing and comprising a base plate where the base plate forms a support plane, and an electric motor disposed in the housing and used for driving the sanding assembly to operate, the electric motor is at least partially located between the mounting surface and the main handle, when the battery pack is mounted on the battery pack coupling portion, the body and the battery pack form a whole machine, and a projection point of a center of gravity of the whole machine on an extended surface of the support plane is located within the support plane of the base plate.