Handheld cutting saw

Abstract

A handheld cutting saw, comprising: a base plate comprising an upper surface and an opposite lower surface, and guiding the handheld cutting saw along a working direction on a workpiece or a guide rail to work; a cutting mechanism comprising a circular saw blade and a motor driving the circular saw blade to rotate about a first axis, the cutting mechanism being pivotally coupled to the base plate about a second axis so as to move between a first position and a second position, wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position, and protrudes from the lower surface of the base plate in the second position; a grip portion for a user to operate so as to cause the circular saw blade to plunge from the first position to the second position relative to the base plate; and a biasing member disposed between the cutting mechanism and the base plate so as to bias the cutting mechanism towards the first position, wherein in a front-rear direction, the first axis is located rearward of the second axis.

Description

Handheld cutting saw

[0001] This application claims priority to Chinese patent application No. 202411586329.0, filed on November 7, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of power tools, such as a handheld cutting saw. Background Technology

[0003] Handheld cutting saws, such as rail saws, typically have a grip fixed to the rear end of the base plate. Rotating the grip around the rear end of the base plate changes the cutting depth of the saw blade. However, this operating method doesn't suit users' cutting habits, leading to inconvenience and a poor user experience when cutting long distances or for extended periods.

[0004] This section provides background information related to this application, which is not necessarily related to the technology. Summary of the Invention

[0005] This application addresses or at least mitigates some or all of the aforementioned problems. To this end, this application provides a user-friendly handheld cutting saw that enhances the user experience.

[0006] One embodiment provides a handheld cutting saw, comprising: a base plate including an upper surface and an opposite lower surface, configured to guide the handheld cutting saw on a workpiece or guide rail along a working direction; a sawing mechanism including a circular saw blade and a motor configured to drive the circular saw blade to rotate about a first axis; the sawing mechanism is pivotally connected to the base plate about a second axis between a first position and a second position; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position; a grip for user operation to cause the circular saw blade to cut relative to the base plate from the first position to the second position; a biasing member disposed between the sawing mechanism and the base plate to bias the sawing mechanism toward the first position; in a front-back direction, the first axis is located behind the second axis; wherein the cutting direction of the handheld cutting saw is defined as the front direction.

[0007] In some embodiments, the handheld cutting saw includes a depth-of-cut component configured to allow the circular saw blade to move between a non-cutting position and a cutting position; the depth-of-cut component includes a pivot attached to a base plate, through which the sawing mechanism is pivotally connected to the base plate.

[0008] In some embodiments, the pivot is located at the front of the motor in the front-rear direction.

[0009] In some embodiments, the pivot is located at the front end of the base plate.

[0010] In some embodiments, the pivot member includes a first end and a second end, the pivot member rotates about the first end as a center, and the second end is fixedly connected to the sawing mechanism.

[0011] In some embodiments, the depth of cut component has a depth scale configured to indicate the depth of cut of the circular saw blade below the plane of the base plate; the depth scale is located at the rear end of the handheld cutting saw.

[0012] In some embodiments, the handheld cutting saw includes a power supply assembly configured to provide a discharge current to power a motor; the power supply assembly includes a battery pack detachably mounted to the handheld cutting saw.

[0013] In some embodiments, the battery pack is disposed on the front side of the grip in the front-rear direction.

[0014] In some embodiments, the battery pack does not protrude beyond the width of the base plate in the left-right direction.

[0015] In some embodiments, the biasing element includes an elastic element.

[0016] In some embodiments, the biasing member drives the sawing mechanism to rotate and reset from the second position to the first position.

[0017] In some embodiments, at least a portion of the grip is located on the right side of the circular saw blade in the left-right direction; wherein, the right side defining the cutting direction is called the right.

[0018] In some embodiments, at least a portion of the motor is located on the right side of the grip.

[0019] In some embodiments, in the left-right direction, the grip includes a first handle that extends from the front end of the base plate toward the rear end of the base plate.

[0020] In some embodiments, the base plate can be adapted to work with the cutting guide rail.

[0021] In some embodiments, a handheld cutting saw includes: a base plate including an upper surface and an opposite lower surface, configured to guide the handheld cutting saw on a workpiece or guide rail along a working direction; a sawing mechanism including a circular saw blade and a motor configured to drive the circular saw blade to rotate; the sawing mechanism is movably connected to the base plate between a first position and a second position; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position; further includes: a connecting mechanism movably disposed between the sawing mechanism and the base plate to enable the circular saw blade to cut relative to the base plate from the first position to the second position; a biasing member connected to the sawing mechanism or the connecting mechanism to bias the sawing mechanism toward the first position; the connecting mechanism has a first end connected to the base plate, the first end being disposed on the front side of the base plate; wherein the cutting direction of the handheld cutting saw is defined as the forward direction.

[0022] In some embodiments, the connecting mechanism has a second end connected to the sawing mechanism, the first end being movable relative to the base plate, and the second end being movable relative to the sawing mechanism.

[0023] In some embodiments, the connecting mechanism is a linkage.

[0024] In some embodiments, the biasing element is a torsion spring that acts on the connecting mechanism.

[0025] In some embodiments, the connecting mechanism has a second end connected to the sawing mechanism, the first end being movable relative to the base plate, and the second end being fixed to the sawing mechanism.

[0026] In some embodiments, the biasing element is a spring, disposed between the base plate and the sawing mechanism.

[0027] In some embodiments, the handheld cutting saw includes a power supply assembly configured to provide a discharge current to power a motor; the power supply assembly includes a battery pack detachably mounted to the handheld cutting saw.

[0028] In some embodiments, the battery pack is disposed on the front half of the base plate in the front-rear direction.

[0029] In some embodiments, a handheld cutting saw includes: a base plate including an upper surface and an opposite lower surface, configured to guide the handheld cutting saw to work on a workpiece or guide rail along a working direction; a sawing mechanism including a circular saw blade and a motor configured to drive the circular saw blade to rotate; the sawing mechanism further includes a pivot member, the sawing mechanism being pivotally connected to the base plate between a first position and a second position based on the pivot member; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position; a grip for user operation to cause the circular saw blade to cut relative to the base plate from the first position to the second position; at least one battery pack configured to provide a discharge current to power the motor; a biasing member disposed between the sawing mechanism and the base plate to bias the sawing mechanism toward the first position; in a front-rear direction, at least a portion of the at least one battery pack is located in front of the grip member, and the pivot member is located in front of the motor; the distance between the center of gravity G of the battery pack and the pivot point B of the pivot member is greater than or equal to 10 mm; wherein the cutting direction of the handheld cutting saw is defined as the front direction.

[0030] In some embodiments, the pivot is located at the front end of the base plate.

[0031] In some embodiments, at least a portion of the grip is located on the right side of the circular saw blade in the left-right direction; wherein, the right side defining the cutting direction is called the right.

[0032] In some embodiments, the battery pack is located on the front half of the base plate.

[0033] In some embodiments, the projection of the battery pack onto the base plate does not extend beyond the base plate.

[0034] In some embodiments, a handheld cutting saw includes: a base plate including an upper surface and an opposite lower surface; a sawing mechanism including a circular saw blade having a cutting plane and a motor configured to drive the circular saw blade to rotate; the sawing mechanism is movably connected to the base plate between a first position and a second position; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position; a grip for user operation to cause the circular saw blade to cut relative to the base plate from the first position to the second position; at least one battery pack configured to provide a discharge current to power the motor; a biasing member disposed between the sawing mechanism and the base plate to bias the sawing mechanism toward the first position; in a left-right direction, at least a portion of the grip is located to the right of the circular saw blade; wherein the cutting direction of the handheld cutting saw is defined as the forward direction, the left side of the cutting direction is defined as the left, and the right side of the cutting direction is defined as the right.

[0035] In some embodiments, the circular saw blade is located on the left side of the motor, and the biasing element is located on the right side of the circular saw blade.

[0036] In some embodiments, at least a portion of the motor is located on the right side of the grip.

[0037] In some embodiments, at least one battery pack is detachably mounted to the handheld cutting saw.

[0038] In some embodiments, when the circular saw blade is cutting vertically, its projection on the base plate is located to the left of the center line of the base plate.

[0039] In some embodiments, the battery pack is disposed on the front side of the grip in the front-rear direction.

[0040] In some embodiments, the battery pack does not protrude beyond the width of the base plate in the left-right direction.

[0041] In some embodiments, the grip includes a first handle that extends from the front end of the base plate toward the rear end of the base plate.

[0042] In some embodiments, the handheld cutting saw further includes a depth of cut component with a depth scale configured to indicate the depth of cut of the circular saw blade below the plane of the base plate; the depth scale is located at the rear end of the handheld cutting saw.

[0043] In some embodiments, the base plate can be adapted to work with the cutting guide rail.

[0044] In some embodiments, the biasing element includes an elastic element.

[0045] In some embodiments, a handheld cutting saw includes: a base plate including an upper surface and an opposite lower surface; a sawing mechanism including a circular saw blade having a cutting plane and a motor configured to drive the circular saw blade to rotate; the sawing mechanism is movably connected to the base plate between a first position and a second position; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position; a grip for user operation to cause the circular saw blade to cut relative to the base plate from the first position to the second position; a battery pack configured to provide a discharge current to power the motor; a biasing member disposed between the sawing mechanism and the base plate to bias the sawing mechanism toward the first position; in a left-right direction, at least a portion of the stator of the motor is disposed to the right of the circular saw blade; wherein the cutting direction of the handheld cutting saw is defined as forward, the left side of the cutting direction is defined as left, and the right side of the cutting direction is defined as right.

[0046] In some embodiments, the circular saw blade is located on the left side of the motor, and the biasing element is located on the right side of the circular saw blade.

[0047] In some embodiments, when the circular saw blade is cutting vertically, its projection on the base plate is located to the left of the center line of the base plate.

[0048] In some embodiments, the handheld cutting saw further includes a depth of cut component with a depth scale configured to indicate the depth of cut of the circular saw blade below the plane of the base plate; the depth scale is located at the rear end of the handheld cutting saw.

[0049] In some embodiments, a handheld cutting saw includes: a base plate including an upper surface and an opposite lower surface; a sawing mechanism including a circular saw blade having a cutting plane and a motor configured to drive the circular saw blade to rotate; the sawing mechanism is movably connected to the base plate between a first position and a second position; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position; a grip for user operation to cause the circular saw blade to cut relative to the base plate from the first position to the second position; a battery pack configured to provide a discharge current to power the motor; a biasing member disposed between the sawing mechanism and the base plate to bias the sawing mechanism toward the first position; the grip having a gripping center facet, wherein the ratio of the distance from the gripping center facet to the right side of the base plate to the distance from the cutting plane to the right side of the base plate in a left-right direction is less than or equal to 1; wherein the cutting direction of the handheld cutting saw is defined as forward, the left side of the cutting direction is defined as left, and the right side of the cutting direction is defined as right.

[0050] In some embodiments, at least a portion of the motor is located on the right side of the grip.

[0051] In some embodiments, the battery pack is disposed on the front side of the grip in the front-rear direction.

[0052] In some embodiments, the grip includes a first handle that extends from the front end of the base plate toward the rear end of the base plate.

[0053] In some embodiments, the handheld cutting saw further includes a depth of cut component with a depth scale configured to indicate the depth of cut of the circular saw blade below the plane of the base plate; the depth scale is located at the rear end of the handheld cutting saw. Attached Figure Description

[0054] Figure 1 is a 3D diagram of the working conditions when a user of a handheld cutting saw is using it.

[0055] Figure 2 is a three-dimensional view of the working condition from another angle when the handheld cutting saw in Figure 1 is in use;

[0056] Figure 3 is a side view of the working conditions of a handheld cutting saw in use by a user according to an embodiment;

[0057] Figure 4 is a three-dimensional diagram of the working conditions when the handheld cutting saw is in use, as shown in Figure 3.

[0058] Figure 5 is a perspective view of a handheld cutting saw according to an embodiment;

[0059] Figure 6 is a perspective view of the handheld cutting saw in Figure 5 from another angle;

[0060] Figure 7 is a perspective view of the handheld cutting saw in Figure 5, excluding the motor housing;

[0061] Figure 8 is a perspective view of the handheld cutting saw in Figure 5, excluding the saw blade housing;

[0062] Figure 9 is a side view of the handheld cutting saw in Figure 5 when it is in the second position;

[0063] Figure 10 is a rear view of the handheld cutting saw in Figure 5;

[0064] Figure 11 is a perspective view of the handheld cutting saw in Figure 5 excluding the battery pack;

[0065] Figure 12 is a perspective view of a handheld cutting saw battery pack protruding from the base plate according to an embodiment;

[0066] Figure 13 is a perspective view of a handheld cutting saw according to an embodiment, in which the battery pack does not protrude from the base plate;

[0067] Figure 14 is a perspective view of a handheld cutting saw battery pack tilted according to an embodiment;

[0068] Figure 15 is a detailed view of the connecting mechanism when the handheld cutting saw in Figure 5 is in the second position. Detailed Implementation

[0069] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0070] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0071] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0072] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0073] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0074] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0075] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0076] Currently, most handheld rail saws typically have the grip on the left side of the saw blade, as shown in Figures 1 and 2. The handheld cutting saw 100a is an example of a rail saw in this category. To facilitate cutting, users need to stand on the right side of the handheld cutting saw 100a. Most users are right-handed, requiring them to bend their right wrist to grip the grip, which is inconvenient for extended use. Alternatively, users can use their left hand, but this is also inconvenient for most users. Furthermore, because a bent right wrist hinders direct movement, users must also use their left hand to hold the other handle, requiring both hands to grip the handheld cutting saw 100a simultaneously. Therefore, the handheld cutting saw 100a is inconvenient for users. Based on this, this application proposes a handheld cutting saw 100b with the grip on the right side of the saw blade, as shown in Figures 3 and 4. This allows users to grip the saw normally with their right hand and work solely with their right hand, improving user convenience. Of course, placing the grip on the right side of the cutting saw blade is not simply a matter of swapping their positions; it requires comprehensive consideration of the battery pack's center of gravity, the overall machine's center of gravity, and the grip's placement, among other things.

[0077] This application uses a handheld cutting saw, specifically a rail saw, as an example for detailed explanation. The rail saw can be used in conjunction with a rail for cutting, or it can cut independently without the rail. Figures 5 and 6 show a handheld cutting saw 100 according to an embodiment of this application. To clearly illustrate the technical solution of this application, the upper side, lower side, left side, right side, front side, and rear side are also defined as shown in Figures 5 and 6. Wherein, the cutting direction of the handheld cutting saw 100 is considered front, the direction corresponding to the cutting direction is rear, the left side of the cutting direction is left, and the right side of the cutting direction is right.

[0078] The handheld cutting saw 100 includes a base plate 110, a sawing mechanism 120, a grip 130, a power supply assembly 140, and a biasing member 150. The base plate 110 includes an upper surface 111 and a lower surface 112. The sawing mechanism 120, grip 130, power supply assembly 140, and biasing member 150 are all disposed above the upper surface 111. The base plate 110 is adaptable to a cutting guide rail. The lower surface 112 of the base plate 110 includes a groove that matches the cutting guide rail 200 shown in Figures 3 and 4, allowing the handheld cutting saw 100 to be placed on the cutting guide rail 200 for cutting. Alternatively, the handheld cutting saw 100 can also be placed directly on other flat surfaces; this application does not limit its placement.

[0079] The sawing mechanism 120 includes a circular saw blade 121 configured to cut a plane, and a motor 122 configured to drive the circular saw blade 121 to rotate. The motor 122 is arranged along a first straight line M, and includes a motor output shaft rotatable about a first axis. In this embodiment, the first axis coincides with the first straight line M, which is the first axis M. In other alternative embodiments, the first axis and the first straight line M are parallel but not coincident. In other alternative embodiments, the first axis and the first straight line M form an angle. The motor 122 drives the circular saw blade 121 to rotate by connecting the motor drive shaft of the motor 122 to the circular saw blade 121. The motor drive shaft is connected to the center 1211 of the circular saw blade 121.

[0080] As shown in Figures 5 to 8, when the circular saw blade 121 is cutting vertically, its projection on the base plate 110 is located to the left of the center line A of the base plate 110, meaning the circular saw blade 121 is positioned slightly to the left of the base plate 110. The circular saw blade 121 is located to the left of the motor 122. The motor 122 includes a rotor and a stator. The motor output shaft corresponding to the rotor of the motor 122 is configured to drive the circular saw blade 121 to rotate, so the stator of the motor 122 is at least partially located to the right of the circular saw blade 121. Therefore, in the left-right direction, at least a portion of the motor 122 is located to the right of the grip 130. Optionally, in the left-right direction, the motor 122 includes a portion opposite to the grip 130 and a portion protruding to the right of the grip 130. Optionally, in the left-right direction, the motor 122 is entirely located to the right of the grip 130.

[0081] The sawing mechanism 120 is movably connected to the base plate 110 between a first position and a second position. The first position is where the sawing mechanism 120 is relatively far from the base plate 110, and the second position is where the sawing mechanism 120 is relatively close to the base plate 110. When the sawing mechanism 120 is in the first position, the circular saw blade 121 does not protrude from the lower surface 112 of the base plate 110. When the sawing mechanism 120 is in the second position, at least a portion of the circular saw blade 121 protrudes from the lower surface 112 of the base plate 110. That is, this application defines the position where the circular saw blade 121 does not protrude from the lower surface 112 as the first position, and defines all positions, including those where the circular saw blade 121 protrudes from the lower surface 112, as the second position. Figures 5 to 8 show the sawing mechanism 120 in the first position, and Figure 9 shows the sawing mechanism 120 in the second position.

[0082] The sawing mechanism 120 also includes a saw blade housing 123 and a motor housing 124. The saw blade housing 123 is configured to house the circular saw blade 121, and the motor housing 124 is configured to house the motor 122. When the sawing mechanism 120 is in the first position, all of the circular saw blades 121 are housed in the saw blade housing 123 and cannot perform cutting; the first position is the non-working position of the sawing mechanism 120. When the sawing mechanism 120 is in the second position, at least a portion of the circular saw blades 121 protrude from the saw blade housing 123 and from the lower surface 112 to perform the cutting function.

[0083] The grip 130 is connected to the motor housing 124 where the motor 122 is located, and the movement of the grip 130 can drive the motor 122 to move. The motor 122 is driven by the circular saw blade 121, so the movement of the grip 130 can also drive the circular saw blade 121 to move. Thus, the grip 130 can be operated by the user to make the circular saw blade 121 cut into the base plate 110 from a first position to a second position.

[0084] As shown in Figures 5 to 8, in the left-right direction, the grip portion 130 is at least partially located on the right side of the circular saw blade 121. Optionally, in the left-right direction, the grip portion 130 includes a portion located on the right side of the circular saw blade 121, and also includes a portion corresponding to the circular saw blade 121. Optionally, in the left-right direction, the grip portion 130 is entirely located on the right side of the circular saw blade 121.

[0085] The power supply assembly 140 is configured to provide discharge current to power the motor 122. The handheld cutting saw 100 includes a mounting portion 141 that matches and is configured to mount the power supply assembly 140. The power supply assembly 140 is detachably mounted to the mounting portion 141 and is disposed on the front half of the base plate 110. The power supply assembly 140 can be a battery pack, which, in conjunction with a corresponding power circuit, powers the handheld cutting saw 100. Those skilled in the art will understand that the DC power supply is not limited to the use of a battery pack; the DC power supply can be a built-in rechargeable battery pack or a standard battery pack. It is understood that the handheld cutting saw 100 can also power its internal components via mains power or AC power, in conjunction with corresponding rectification, filtering, and voltage regulation circuits. In the following description, the battery pack 140 will be used instead of the power supply assembly 140, but this should not be construed as a limitation of the invention.

[0086] A biasing member 150 is disposed between the sawing mechanism 120 and the base plate 110, configured to connect the sawing mechanism 120 and the base plate 110, thereby biasing the sawing mechanism 120 toward a first position. The biasing member 150 is located on the right side of the circular saw blade 121. Optionally, as shown in Figures 5 to 8, the biasing member 150 includes an elastic element. When the user is not holding the grip 130, the biasing member 150 applies an elastic force to the sawing mechanism 120, causing the sawing mechanism 120 to be biased toward the first position. When the user holds and moves the grip 130 to move the sawing mechanism 120 toward a second position, the biasing member 150 is compressed, and the user must continuously press the grip 130 to bring the sawing mechanism 120 to the second position to perform cutting. After the user releases the grip 130, based on the elastic action of the biasing member 150, the sawing mechanism 120 returns from the second position to the first position.

[0087] The handheld cutting saw 100 also includes a depth-of-cut component 160, which is configured to allow the circular saw blade 121 to move between a non-cutting position and a cutting position, i.e., the depth-of-cut component 160 is configured to allow the circular saw blade 121 to move between a first position and a second position. As shown in Figures 7 and 10, the depth-of-cut component 160 includes a depth scale 161, a depth indicator 162, and a connecting mechanism 163. The depth scale 161 is configured to indicate the cutting depth of the circular saw blade 121 below the plane of the base plate 110, i.e., the protrusion depth of the circular saw blade 121 beyond the lower surface 112 of the base plate 110. The depth indicator 162 is configured to cooperate with the depth scale 161 to indicate the cutting depth. A connecting mechanism 163 is movably disposed between the sawing mechanism 120 and the base plate 110, configured to connect the base plate 110 and the sawing mechanism 120. The connecting mechanism 163 includes a first end 1631 connected to the base plate 110 and a second end 1632 connected to the sawing mechanism 120. The first end 1631 is connected to the front side of the base plate 110, and the connecting mechanism 163 moves around the first end 1631, thereby driving the sawing mechanism 120 connected to the connecting mechanism 163 to move.

[0088] In some embodiments, the grip portion 130 includes a first handle 131 extending from the front end of the base plate 110 toward the rear end of the base plate 110. The first handle 131 extends to a position at the rear end of the base plate 110 that facilitates user gripping. The first handle 131 includes a handle center 1311, which is located at the rear end of the saw blade center 1211 of the circular saw blade 121 in the front-rear direction. The straight-line distance between the handle center 1311 and the saw blade center 1211 is X1. X1 is the shortest straight-line distance between the handle center 1311 and the saw blade center 1211. Figure 9 is a schematic diagram of the straight-line distance X1 when the sawing mechanism 120 is in a second position. The straight-line distance X1 also includes the distance between the two when the sawing mechanism 120 is in a first position, or the distance between the two when the sawing mechanism 120 is in a second position different from the position in Figure 9. The straight-line distance X1 between the handle center 1311 and the saw blade center 1211 is greater than or equal to 80 mm. Optionally, the straight-line distance X1 between the handle center 1311 and the saw blade center 1211 can be 84mm. Optionally, the straight-line distance X1 between the handle center 1311 and the saw blade center 1211 can be 95mm. Optionally, the straight-line distance X1 between the handle center 1311 and the saw blade center 1211 can be 100mm. Optionally, the straight-line distance X1 between the handle center 1311 and the saw blade center 1211 can be 114mm. Optionally, the straight-line distance X1 between the handle center 1311 and the saw blade center 1211 can be 120mm.

[0089] Therefore, by placing the first handle 131 at the rear end of the handheld cutting saw 100 for easy gripping by the user, and with the circular saw blade 121 including a portion exposed above the saw blade housing 123 on the side facing the grip 130, and by placing the handle center 1311 at the rear end of the saw blade center 1211 of the circular saw blade 121, the user is prevented from touching the circular saw blade 121 when gripping the first handle 131, thus improving the safety of using the handheld cutting saw 100.

[0090] In some embodiments, the straight-line distance between the handle center 1311 and the center of the first end 1631 of the connecting mechanism 163 is X2. X2 is the shortest straight-line distance between the handle center 1311 and the center of the first end 1631 of the connecting mechanism 163. Figure 7 is a schematic diagram of the straight-line distance X2 when the sawing mechanism 120 is in a first position. The straight-line distance X2 also includes the distance between the handle center 1311 and the first end 1631 when the sawing mechanism 120 is in different second positions. The straight-line distance X2 between the handle center 1311 and the center of the first end 1631 of the connecting mechanism 163 is greater than or equal to 190 mm. Optionally, the straight-line distance X2 between the handle center 1311 and the center of the first end 1631 of the connecting mechanism 163 is 200 mm. Optionally, the straight-line distance X2 between the handle center 1311 and the center of the first end 1631 of the connecting mechanism 163 is 205 mm. Optionally, the straight-line distance X2 between the handle center 1311 and the center of the first end 1631 of the connecting mechanism 163 is 210 mm. Optionally, the straight-line distance X2 between the center of the handle 1311 and the center of the first end 1631 of the connecting mechanism 163 is 217mm. This relatively large distance makes it easier for the user to hold the first handle 131 and move the sawing mechanism 120 from the first position to the second position.

[0091] In some embodiments, as shown in FIG10, the grip portion 130 includes a gripping dividing surface 132. In the left-right direction, the ratio of the distance between the gripping dividing surface 132 and the right side of the base plate 110 to the distance between the cutting plane of the circular saw blade 121 and the right side of the base plate 110 is less than or equal to 1. That is, the gripping dividing surface 132 can be located to the right of the cutting plane of the circular saw blade 121, or the gripping dividing surface 132 can be on the same straight line as the cutting plane of the circular saw blade 121.

[0092] In some embodiments, the grip 130 can be switched in position on the handheld cutting saw 100. The grip 130 includes a first mounting state and a second mounting state for a user to hold and operate the handheld cutting saw 100 to cut workpieces. In the first mounting state, at least a portion of the grip 130 is located to the right of the circular saw blade 121 in the left-right direction, as shown in FIG10. In the second mounting state, at least a portion of the grip 130 is located to the left of the circular saw blade 121 in the left-right direction.

[0093] In the first and second installation states, the circular saw blade 121 rotates in opposite directions. If the circular saw blade 121 rotates clockwise in the first installation state, it rotates counterclockwise in the second installation state. Similarly, if the circular saw blade 121 rotates counterclockwise in the first installation state, it rotates clockwise in the second installation state.

[0094] Optionally, the grip 130 is detachable, and the first installation state and the second installation state are switched by detaching the grip 130. Optionally, the grip 130 is rotatable, and the first installation state and the second installation state are switched by rotating the grip 130. Optionally, when the grip 130 is in the first installation state and the second installation state, the interfaces on the handheld cutting saw 100 corresponding to the grip 130 are the same. Optionally, when the grip 130 is in the first installation state and the second installation state, the interfaces on the handheld cutting saw 100 corresponding to the grip 130 are different.

[0095] In some embodiments, the battery pack 140 can be multiple battery packs. In the front-rear direction, at least one battery pack 140 is disposed on the front half of the base plate 110, positioned in front of the grip portion 130. In the left-right direction, the battery pack 140 does not protrude beyond the width of the base plate 110. Thus, when the user uses the handheld lawnmower 100, the battery pack 140 disposed on the front side will not obstruct the user's view. At the same time, since the battery pack 140 is disposed on the front half of the base plate 110, the center of gravity G of the battery pack 140 is located in the front half of the base plate 110, and the first handle 131 extends toward the rear end of the base plate 110, with the center of gravity of the first handle 131 located in the rear half of the base plate 110. This balances the center of gravity of the handheld lawnmower 100, allowing the handheld lawnmower 100 to be placed stably on a horizontal surface.

[0096] When the battery pack 140 is disposed in the front half of the base plate 110, it has multiple disposal positions. The distance between the center of gravity G of the battery pack 140 and the rotation fulcrum B of the connecting mechanism 163 is X3. The rotation fulcrum B of the connecting mechanism 163 is the center of the second end 1632 of the connecting mechanism 163. X3 is the shortest straight-line distance between the center of gravity G of the battery pack 140 and the rotation fulcrum B of the connecting mechanism 163. Figure 14 is a schematic diagram of the distance X3 between the center of gravity G and the rotation fulcrum B when the battery pack 140 and the mounting part 141 are tilted in one embodiment. The distance X3 also includes the distance between the center of gravity G and the rotation fulcrum B when the battery pack 140 is disposed in other positions. In some embodiments, the distance X3 between the center of gravity G of the battery pack 140 and the rotation fulcrum B of the connecting mechanism 163 is greater than or equal to 10 mm. In some embodiments, the distance X3 between the center of gravity G of the battery pack 140 and the rotation fulcrum B of the connecting mechanism 163 is 25 mm. In some embodiments, the distance X3 between the center of gravity G of the battery pack 140 and the rotation fulcrum B of the connecting mechanism 163 is 40 mm. In some embodiments, the distance X3 between the center of gravity G of the battery pack 140 and the rotation fulcrum B of the connecting mechanism 163 is 65 mm.

[0097] When the battery pack 140 is positioned in the front half of the base plate 110, the multiple mounting positions include:

[0098] In some embodiments, as shown in FIG5, the battery pack 140 is inserted into the mounting portion 141 along the vertical direction. At this time, the distance between the mounting portion 141 and the foremost end of the base plate 110 is small, which is less than the width of the battery pack 140 in the front-back direction. This results in a portion of the battery pack 140 protruding from the front end of the base plate 110 after being inserted into the mounting portion 141. In some embodiments, as shown in FIG11, the length of the mounting portion 141 from the base plate 110 is greater than the width of the battery pack 140 in the front-back direction. Therefore, after the battery pack 140 is inserted into the mounting portion 141, the projection of the battery pack 140 on the base plate 110 does not exceed the range of the base plate 110. That is, the entire battery pack 140 is disposed within the range of the base plate 110.

[0099] In some embodiments, as shown in FIG12, the battery pack 140 is inserted into the mounting portion 141 along the front-rear direction. The mounting portion 141 includes a portion protruding from the foremost end of the base plate 110. Therefore, after the battery pack 140 is inserted into the mounting portion 141, there is a portion protruding from the foremost end of the base plate 110. In some embodiments, as shown in FIG13, the battery pack 140 is inserted into the mounting portion 141 along the front-rear direction. In this case, the entire mounting portion 141 is positioned in front of the base plate 110, and the length of the mounting portion 141 from the base plate 110 is greater than the length of the battery pack 140 in the front-rear direction. Therefore, after the battery pack 140 is inserted into the mounting portion 141, the entire battery pack 140 is positioned within the range of the base plate 110, and the projection of the battery pack 140 onto the base plate 110 does not exceed the range of the base plate 110.

[0100] In some embodiments, as shown in FIG14, the mounting portion 141 is obliquely disposed on the upper side of the base plate 110, and the projection of the mounting portion 141 on the base plate 110 does not exceed the range of the base plate 110. The battery pack 140 is obliquely inserted into the mounting portion 141 along a direction parallel to the mounting portion 141. At this time, the battery pack 140 does not extend beyond the base plate 110 in either the front-back or left-right directions, that is, the projection of the battery pack 140 on the base plate 110 does not exceed the range of the base plate 110. In some embodiments, the mounting portion 141 is obliquely disposed on the upper side of the base plate 110, and the projection of the mounting portion 141 on the base plate exceeds the range of the base plate 110. In this case, when the battery pack 140 is inserted into the mounting portion 141, there is a portion that extends beyond the base plate 110. In some embodiments, the mounting portion 141 is obliquely disposed on the upper side of the base plate 110, and the projection of the mounting portion 141 on the base plate does not exceed the range of the base plate 110. However, when the battery pack 140 is inserted into the mounting portion 141, the projection of the battery pack 140 in the front-back direction on the base plate 110 exceeds the range of the base plate 110. That is, the battery pack 140 includes a portion that extends beyond the front end of the base plate 110.

[0101] The depth cutting component 160 includes a depth scale 161, a depth indicator 162, and a connecting mechanism 163. The depth scale 161, the depth indicator 162, and the connecting mechanism 163 will be described in detail below.

[0102] As shown in Figure 10, the depth scale 161 includes graduations, and the maximum graduation of the depth scale 161 is set based on the maximum cutting depth of the circular saw blade 121. The depth scale 161 is located at the rear end of the handheld cutting saw 100, so that when the user is using it, the depth scale 161 is facing the user, making it easy for the user to observe and determine the cutting depth of the circular saw blade 121 at any time.

[0103] As shown in Figures 12 and 14, a sliding track 1231 is provided on the side of the saw blade housing 123 facing the grip 130, and the depth indicator 162 can slide freely on the sliding track 1231. The sliding track 1231 includes multiple sharp teeth, and the depth indicator 162 includes portions that match the multiple sharp teeth, so that the depth indicator 162 can stop at the desired position on the sliding track 1231, setting the required cutting depth. During the process of the handheld cutting saw 100 moving to the second position, the grip 130 will abut against the depth indicator 162 and be limited by the depth indicator 162, so that the handheld cutting saw 100 can cut according to the depth set by the depth indicator 162. For example, after the depth indicator 162 slides on the sliding track 1231 to the scale 30 on the depth scale 161, the user holds and moves the grip 130 until the scale 30 is limited. At this time, the cutting depth of the circular saw blade 121 is 30.

[0104] When the circular saw blade 121 is in the first position, the corresponding scale of the depth scale 161 is 0. As the circular saw blade 121 moves from the first position to the second position, the scale of the depth scale 161 increases until the circular saw blade 121 reaches its maximum depth, at which point the corresponding scale of the depth scale 161 is at its maximum. Optionally, the maximum scale of the depth scale 161 can be 40. Optionally, the maximum scale of the depth scale 161 can be 50. Optionally, the maximum scale of the depth scale 161 can be 60. Furthermore, the maximum scale of the depth scale 161 can also be the scale corresponding to the maximum cutting depth of other circular saw blades 121; this application does not limit this.

[0105] As shown in Figures 7 and 15, the connecting mechanism 163 is movably disposed between the sawing mechanism 120 and the base plate 110, allowing the circular saw blade 121 to cut into the base plate 110 from a first position to a second position. The connecting mechanism 163 connects the base plate 110 and the sawing mechanism 120, and includes a first end 1631 connected to the base plate 110 and a second end 1632 connected to the sawing mechanism 120. The connecting mechanism 163 is disposed at the front end of the base plate 110, in front of the motor 122, and in front of the center 1221 of the circular saw blade 121. That is, the handheld cutting saw 100 moves around the connecting mechanism 163 at the front end of the base plate 110.

[0106] In some embodiments, the connecting mechanism 163 is a pivot member, and the sawing mechanism 120 is pivotally connected to the base plate 110 via the pivot member. In this case, the biasing member 150 is a spring, located between the base plate 110 and the sawing mechanism 160. As shown in FIG11, the connecting mechanism 163 includes a second axis N; specifically, the first end 1631 of the connecting mechanism 163 includes the second axis N, and the sawing mechanism 120 is pivotally connected to the base plate 110 around the second axis N between a first position and a second position. The second axis N is parallel to the first axis M, and the first axis M is located behind the second axis N.

[0107] The first end 1631 of the connecting mechanism 163 is movable relative to the base plate 110, and the second end 1632 of the connecting mechanism 163 is fixed to the sawing mechanism 120. When the user is not holding the grip 130, the biasing member 150 applies an upward elastic force to the sawing mechanism 120, causing the sawing mechanism 120 to be biased toward the first position. As the user holds and moves the grip 130 to pivot the sawing mechanism 120 toward the second position, the connecting mechanism 163 rotates about the second axis N (i.e., the first end 1631). Since the second end 1632 is fixed to the sawing mechanism 120, the sawing mechanism 120 rotates about the second axis N based on the connecting mechanism 163. At this time, the biasing member 150 is compressed downward. After the user releases the grip 130, based on the elastic action of the biasing member 150, the connecting mechanism 163 rotates again about the second axis N, causing the sawing mechanism 120 to rotate back from the second position to the first position.

[0108] Therefore, when the connecting mechanism 163 is a pivot, the connecting mechanism 163 rotates around the first end 1631, and the second end 1632 is fixedly connected to the sawing mechanism 120, which drives the sawing mechanism 120 to rotate, thereby driving the circular saw blade 121 to rotate and switch between the first position and the second position.

[0109] In some embodiments, the connecting mechanism 163 is a link, in which case the biasing element 150 is a torsion spring acting on the connecting mechanism 163. Optionally, the connecting mechanism 163 is a single link. Optionally, the connecting mechanism 163 is two links, which are parallel to each other to connect the base plate 110 and the sawing mechanism 120. In addition, the connecting mechanism 163 may also be a number of links, and the multiple links may be parallel or intersecting, which is not limited in this application.

[0110] The first end 1631 of the connecting mechanism 163 is movable relative to the base plate 110, and the second end 1632 of the connecting mechanism 163 is movable relative to the sawing mechanism 120. When the user is not holding the grip 130, the biasing member 150 applies an elastic force to the sawing mechanism 120, causing the sawing mechanism 120 to be biased towards a first position. As the user holds and moves the grip 130 to move the sawing mechanism 120 towards a second position, the first end 1631 of the connecting mechanism 163 rotates relative to the base plate 110, and the connecting mechanism 163 rotates around the first end 1631. Because the second end 1632 of the connecting mechanism 163 rotates relative to the sawing mechanism 120, the sawing mechanism 120 changes its position relative to the connecting mechanism 163, thereby allowing the sawing mechanism 120 connected to the second end 1632 of the connecting mechanism 163 to move directly from the first position to the second position. At this time, the biasing member 150 is compressed. After the user releases the grip 130, based on the elastic action of the bias member 150, the connecting mechanism 163 rotates again around the first end 1631, causing the sawing mechanism 120 to move radially from the second position back to the first position.

[0111] Therefore, when the connecting mechanism 163 is a connecting rod, the connecting mechanism 163 rotates around the first end 1631 as the center, and the second end 1632 rotates relative to the sawing mechanism 120 at the same time, thereby driving the circular saw blade 121 to move and switch directly between the first position and the second position.

[0112] The handheld cutting saw 100 also includes a circuit board 300 for controlling the operation of a motor 122. The battery board 300 controls the motor 122 based on power supplied by the battery pack 140. The battery board 300 can be positioned in any convenient location within the handheld cutting saw 100 to connect with the motor 122. In some embodiments, as shown in FIG11, the circuit board 300 can be vertically arranged in the handheld cutting saw 100 along the vertical direction, wherein the longer side of the circuit board 300 is parallel to the horizontal direction, and the shorter side is parallel to the vertical direction. In this case, the circuit board 300 is close to both the motor 122 and the battery pack 140, making the wiring between the circuit board 300 and both relatively simple and convenient. In some embodiments, as shown in FIG12, the circuit board 300 can be vertically arranged in the handheld cutting saw 100 along the vertical direction, wherein the longer side of the circuit board 300 is parallel to the vertical direction, and the shorter side is parallel to the horizontal direction. In some embodiments, as shown in FIG13, the circuit board 300 is inclinedly disposed in the handheld cutting saw 100. The inclination angle of the circuit board 300 can be set based on the inclination angle of the motor housing 124, thereby avoiding excessive space size of the entire machine. In addition, the circuit board 300 can also be disposed in the handheld cutting saw 100 at other angles, in other ways, or in other positions, which are not limited in this application.

[0113] Therefore, by including a portion of the grip 130 located on the right side of the sawing mechanism 120, this application allows the user to conveniently operate the handheld cutting saw 100 with their right hand. This ensures a comfortable user experience and reduces fatigue even when cutting long workpieces or using the handheld cutting saw 100 for extended periods. Furthermore, the application also places the connecting mechanism 163 on the front side of the base plate 110. During use, the user can easily move the grip 130 around the connecting mechanism 163, thereby switching the sawing mechanism 120 between a first and a second position. Additionally, this application places a depth scale 161 at the rear end of the handheld cutting saw 100, allowing the user to easily read the cutting depth and set or modify the desired cutting depth at any time.

[0114] Furthermore, since the grip 130 includes a portion located on the right side of the sawing mechanism 120, when carrying the handheld cutting saw 100, the user can hold the grip 130 with their right hand, allowing the entire handheld cutting saw 100 to be positioned at their side. At this time, the part in contact with the user's side is the saw blade housing 123 containing the circular saw blade 121, making the contact area relatively flat. This avoids discomfort caused by uneven surfaces contacting the user's side, improving user comfort when carrying the saw. Additionally, since the circular saw blade 121 is entirely housed within the saw blade housing 123, with no protruding parts, it prevents cuts to the user during carrying, providing a certain level of safety.

[0115] Therefore, the handheld cutting saw 100 proposed in this application is not simply a matter of moving the grip of the related handheld cutting saw 100a from the left side to the right side of the cutting saw blade. To facilitate user movement of the grip for cutting or changing the cutting depth, this application places the connecting mechanism on the front of the handheld cutting saw and positions the grip behind the center of gravity of the circular saw blade, making it safer and easier for the user to move the grip. Simultaneously, the battery pack is positioned based on the overall machine's center of gravity, taking into account the influence of the battery pack's center of gravity on the overall machine's center of gravity, thus limiting the battery pack's placement and the distance between the battery pack's center of gravity and the pivot point.

[0116] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A handheld cutting saw, comprising: The base plate, including an upper surface and an opposite lower surface, is configured to guide the handheld cutting saw in operation along the working direction on the workpiece or guide rail; A sawing mechanism includes a circular saw blade and a motor configured to drive the circular saw blade to rotate about a first axis; the sawing mechanism is pivotally connected to a base plate about a second axis between a first position and a second position; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position. A grip is provided for user operation to allow the circular saw blade to cut into the base plate from the first position to the second position. A biasing element is disposed between the sawing mechanism and the base plate to bias the sawing mechanism toward the first position; In the front-back direction, the first axis is located behind the second axis; and the cutting direction of the handheld cutting saw is defined as the front direction.

2. The handheld cutting saw of claim 1, further comprising a depth-of-cut component configured to allow the circular saw blade to move between a non-cutting position and a cutting position; the depth-of-cut component comprising a pivot connected to the base plate, the sawing mechanism being pivotally connected to the base plate via the pivot.

3. The handheld cutting saw as described in claim 2, wherein, In the front-rear direction, the pivot is located on the front side of the motor.

4. The handheld cutting saw as described in claim 2, wherein, The pivot member is located at the front end of the base plate.

5. The handheld cutting saw as described in claim 2, wherein, The pivot member includes a first end and a second end. The pivot member rotates around the first end as the center, and the second end is fixedly connected to the sawing mechanism.

6. The handheld cutting saw as described in claim 2, wherein, The depth of cut component has a depth gauge configured to indicate the depth of cut of the circular saw blade below the base plate plane; the depth gauge is located at the rear end of the handheld cutting saw.

7. The handheld cutting saw of claim 1, further comprising a power supply assembly configured to provide a discharge current to power the motor; the power supply assembly comprising a battery pack detachably mounted to the handheld cutting saw.

8. The handheld cutting saw as described in claim 7, wherein, In the front-rear direction, the battery pack is located on the front side of the grip.

9. The handheld cutting saw as described in claim 7, wherein, In the left-right direction, the battery pack does not protrude beyond the width of the base plate.

10. The handheld cutting saw as claimed in claim 1, wherein, The biasing element includes an elastic element.

11. The handheld cutting saw as claimed in claim 10, wherein, The biasing component drives the sawing mechanism to rotate from the second position back to the first position.

12. The handheld cutting saw as claimed in claim 1, wherein, In the left-right direction, at least a portion of the grip is located on the right side of the circular saw blade; wherein, the right side of the cutting forward direction is defined as the right.

13. The handheld cutting saw as claimed in claim 12, wherein, At least a portion of the motor is located on the right side of the grip.

14. The handheld cutting saw as claimed in claim 1, wherein, In the left-right direction, the grip includes a first handle that extends from the front end of the base plate toward the rear end of the base plate.

15. The handheld cutting saw as claimed in claim 1, wherein, The base plate is compatible with the cutting guide rail.

16. A handheld cutting saw, comprising: The base plate, including an upper surface and an opposite lower surface, is configured to guide the handheld cutting saw in operation along the working direction on the workpiece or guide rail; A sawing mechanism includes a circular saw blade and a motor configured to drive the circular saw blade to rotate; the sawing mechanism is movably coupled to the base plate between a first position and a second position; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position. A connecting mechanism is movably disposed between the sawing mechanism and the base plate, so that the circular saw blade can cut into the base plate from the first position to the second position. A biasing element is connected to the sawing mechanism or the connecting mechanism to bias the sawing mechanism toward the first position; The connecting mechanism has a first end that is connected to the base plate, and the first end is located on the front side of the base plate; wherein, the cutting direction of the handheld cutting saw is defined as the forward direction.

17. A handheld cutting saw, comprising: The base plate, including an upper surface and an opposite lower surface, is configured to guide the handheld cutting saw in operation along the working direction on the workpiece or guide rail; A sawing mechanism includes a circular saw blade and a motor configured to drive the circular saw blade to rotate; the sawing mechanism further includes a pivot member, the sawing mechanism being pivotally connected to the base plate between a first position and a second position based on the pivot member; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position, and protrudes from the lower surface of the base plate in the second position. A grip is provided for user operation to allow the circular saw blade to cut into the base plate from the first position to the second position. At least one battery pack is configured to provide a discharge current to power the motor; A biasing element is disposed between the sawing mechanism and the base plate to bias the sawing mechanism toward the first position; In the front-rear direction, at least a portion of the at least one battery pack is located on the front side of the grip, and the pivot is located on the front side of the motor; The distance between the center of gravity G of the battery pack and the rotation fulcrum B of the pivot is greater than or equal to 10mm; wherein, the cutting direction of the handheld cutting saw is defined as the forward direction.

18. The handheld cutting saw as claimed in claim 17, wherein, The pivot member is located at the front end of the base plate.

19. The handheld cutting saw as claimed in claim 17, wherein, In the left-right direction, at least a portion of the grip is located on the right side of the circular saw blade; wherein, the right side of the cutting forward direction is defined as the right.

20. The handheld cutting saw as claimed in claim 17, wherein, The battery pack is located on the front half of the base plate.

21. A handheld cutting saw, comprising: The base plate includes an upper surface and an opposite lower surface; A sawing mechanism includes a circular saw blade having a cutting plane and a motor configured to drive the circular saw blade to rotate; The sawing mechanism is movably connected to the base plate between a first position and a second position; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position; A grip is provided for user operation to allow the circular saw blade to cut into the base plate from the first position to the second position. At least one battery pack is configured to provide a discharge current to power the motor; A biasing element is disposed between the sawing mechanism and the base plate to bias the sawing mechanism toward the first position; In the left-right direction, at least a portion of the grip is located on the right side of the circular saw blade; Wherein, the cutting direction of the handheld cutting saw is defined as the forward direction, the left side of the cutting direction is defined as the left, and the right side of the cutting direction is defined as the right.

22. The handheld cutting saw as claimed in claim 21, wherein, The circular saw blade is located on the left side of the motor, and the biasing element is located on the right side of the circular saw blade.

23. The handheld cutting saw as claimed in claim 21, wherein, At least a portion of the motor is located on the right side of the grip.

24. The handheld cutting saw as claimed in claim 21, wherein, At least one of the battery packs is detachably mounted to the handheld cutting saw.

25. The handheld cutting saw as claimed in claim 21, wherein, When the circular saw blade makes a vertical cut, its projection on the base plate is located to the left of the center line of the base plate.

26. The handheld cutting saw as claimed in claim 21, wherein, In the front-rear direction, the battery pack is located on the front side of the grip.

27. The handheld cutting saw as claimed in claim 21, wherein, In the left-right direction, the battery pack does not protrude beyond the width of the base plate.

28. The handheld cutting saw as claimed in claim 21, wherein, The grip includes a first handle that extends from the front end of the base plate toward the rear end of the base plate.

29. The handheld cutting saw of claim 21, further comprising a depth-of-cut component having a depth gauge configured to indicate the depth of cut of the circular saw blade below the plane of the base plate; the depth gauge being disposed at the rear end of the handheld cutting saw.

30. The handheld cutting saw as claimed in claim 21, wherein, The base plate is compatible with the cutting guide rail.

31. The handheld cutting saw as claimed in claim 21, wherein, The biasing element includes an elastic element.

32. A handheld cutting saw, comprising: The base plate includes an upper surface and an opposite lower surface; A sawing mechanism includes a circular saw blade having a cutting plane and a motor configured to drive the circular saw blade to rotate; The sawing mechanism is movably connected to the base plate between a first position and a second position; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position; A grip is provided for user operation to allow the circular saw blade to cut into the base plate from the first position to the second position. The battery pack is configured to provide discharge current to power the motor; A biasing element is disposed between the sawing mechanism and the base plate to bias the sawing mechanism toward the first position; In the left-right direction, at least a portion of the stator of the motor is disposed on the right side of the circular saw blade; Here, the cutting direction of the handheld cutting saw is defined as forward, the left side of the cutting direction is defined as left, and the right side of the cutting direction is defined as right.

33. A handheld cutting saw, comprising: The base plate includes an upper surface and an opposite lower surface; A sawing mechanism includes a circular saw blade having a cutting plane and a motor configured to drive the circular saw blade to rotate; The sawing mechanism is movably connected to the base plate between a first position and a second position; wherein the circular saw blade does not protrude from the lower surface of the base plate in the first position and protrudes from the lower surface of the base plate in the second position; A grip is provided for user operation to allow the circular saw blade to cut into the base plate from the first position to the second position. The battery pack is configured to provide discharge current to power the motor; A biasing element is disposed between the sawing mechanism and the base plate to bias the sawing mechanism toward the first position; The gripping part has a gripping center surface, and in the left-right direction, the ratio of the distance from the gripping center surface to the right side of the base plate to the distance from the cutting plane to the right side of the base plate is less than or equal to 1. Here, the cutting direction of the handheld cutting saw is defined as forward, the left side of the cutting direction is defined as left, and the right side of the cutting direction is defined as right.

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