Cutting tool and handheld tool

Abstract

Cutting tool, comprising: a body assembly including at least a first housing for holding by a hand; a head assembly comprising: an electric motor; a second housing intended to accommodate the electric motor; an output shaft provided for installing a cutting element for cutting a workpiece; a transmission assembly connected between the motor shaft and the output shaft and transmitting the driving force of the electric motor to the output shaft; characterized in that it further comprises: a third housing housing at least a portion of the transfer assembly, wherein, when the cutting element cuts the workpiece, the third housing has a first contact surface and a second contact surface with the workpiece; and wherein the cutting element has a maximum depth of cut when the first contact surface and the second contact surface are in contact with the workpiece; and wherein the angular range between the first contact surface and the second contact surface is greater than or equal to 50 degrees and less than or equal to 85 degrees, and wherein the maximum depth of cut is greater than or equal to 20 mm.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power tools, in particular a cutting tool and a hand-held tool. STATE OF THE ART

[0002] A power tool is a mechanized tool powered by an electric motor or electromagnet that drives a working head via a gear mechanism. It can be handheld and operated and is driven by a low-power electric motor or electromagnet to drive the working head via a transmission mechanism. Existing power tools are generally equipped with a lighting device to facilitate use in low-light conditions.

[0003] Cutting tools such as angle grinders and cutting machines are usually equipped with a cutting cover to prevent grinding or cutting debris, boards or weeds from flying around and to prevent working head accessories such as grinding wheels, saw blades, cutting blades from being broken for any reason, and to prevent the user from being accidentally injured by a saw blade.

[0004] Cutting tools are limited in terms of their maximum cutting depth when cutting a workpiece. As the cutting element, such as the cutting blade, gradually approaches the workpiece during the cutting process and cuts deeper and deeper, the cutting tool structures, such as the outer casing and the cutting cover, eventually contact the workpiece, making the cutting tool unable to continue cutting deeper and achieve the maximum cutting depth. Therefore, the shape of the cutting tool affects the maximum cutting depth that can be achieved. In addition, the shape of the cutting tool also affects the range of cutting angles that can be achieved. From the user's perspective, it is often desirable to have a cutting tool that can achieve both a greater cutting depth and a greater cutting angle.

[0005] In the use process of some cutting tools, the user can only achieve the maximum cutting depth when the cutting cover is set to the limit position at both ends, and when the cutting cover is in other positions, the maximum cutting depth of the cutting tool cannot be achieved even if the cutting tool penetrates deep into the outer casing and contacts the workpiece. DISCLOSURE OF THE UTILITY MODEL

[0006] One purpose of the present application is to solve or at least mitigate some or all of the problems outlined above. To this end, one purpose of the present application is to provide a cutting tool or handheld tool.

[0007] As described above, the present application uses the following technical solution: A cutting tool comprising: a body assembly including at least a first housing for handholding; a head assembly including: an electric motor; a second housing configured to receive the electric motor; an output shaft configured to install a cutting element for cutting a workpiece; a transmission assembly connected between the motor shaft and the output shaft and transmitting the driving force of the electric motor to the output shaft; characterized by further comprising: a third housing enclosing at least a portion of the transmission assembly, wherein, when the cutting element cuts the workpiece, the third housing has a first contact surface and a second contact surface with the workpiece; and wherein the cutting element has a maximum cutting depth when the first contact surface and the second contact surface are in contact with the workpiece.and wherein the angular range between the first contact surface and the second contact surface is greater than or equal to 50 degrees and less than or equal to 85 degrees, and wherein the maximum cutting depth is greater than or equal to 20 mm.;

[0008] In one embodiment, the second housing and the third housing are fastened by screws.

[0009] In one embodiment, the cutting tool further comprises a battery pack that supplies power to the cutting tool, wherein the nominal voltage of the battery pack is greater than or equal to 8 V.

[0010] In one embodiment, the output power of the electric motor is greater than or equal to 250 W.

[0011] In one embodiment, the cutting tool further comprises a head adjustment assembly disposed on the first housing and / or the second housing; wherein, when the head adjustment assembly is actuated, the head assembly is capable of rotating relative to the body assembly.

[0012] In one embodiment, the cutting tool further comprises a main switch disposed on the first housing; wherein, when the head adjustment assembly is actuated, actuation of the main switch is restricted.

[0013] In one embodiment, the cutting tool further comprises a cutting cover and a cover accessory, wherein the cutting cover covers the cutting element in the radial direction and can rotate about the output shaft; and wherein the cover accessory is detachably installed on the cutting cover; and wherein at least one vacuum cleaner tube is detachably installed on the cover accessory.

[0014] In one embodiment, the cutting tool further comprises a third contact surface, wherein the cutting element has the maximum cutting depth when the third contact surface is in contact with the workpiece.

[0015] In one embodiment, the in-plane projection of the third contact surface is located between the in-plane projection of the first contact surface and the in-plane projection of the second contact surface when viewed in a plane perpendicular to the output shaft.

[0016] In one embodiment, the cutting tool further comprises a cutting cover that covers the cutting element in the radial direction and can rotate about the output shaft; wherein the third contact surface is arranged on the cutting cover or the third housing.

[0017] In one embodiment, the first contact surface is tangent to the third contact surface and the second contact surface is tangent to the third contact surface when viewed in a plane perpendicular to the output shaft.

[0018] In one embodiment, the projection of the cutting cover in a direction perpendicular to the output shaft includes a first cover edge and a second cover edge; wherein, when the cutting cover is at a first limit position, the first cover edge is oriented substantially parallel to the first contact surface; and wherein, when the cutting cover is at a second limit position, the second cover edge is oriented substantially parallel to the second contact surface.

[0019] In one embodiment, the cutting tool further comprises a third contact surface arranged on the third housing, wherein the cutting element can reach its maximum cutting depth when the third contact surface is in contact with the workpiece.

[0020] In one embodiment, the third contact surface is provided as a circular arc surface with a fixed radius of curvature, wherein the radius of curvature is greater than or equal to 13 mm.

[0021] A handheld tool comprising: a body assembly including at least a first housing for holding by a hand; a head assembly including: an electric motor; a second housing configured to house the electric motor; an output shaft configured to install a cutting element for cutting a workpiece; a transmission assembly housed in a third housing and connected between the motor shaft and the output shaft, and transmitting the driving force of the electric motor to the output shaft; further comprising: a cutting cover radially covering the cutting element and rotatable about the output shaft relative to the second housing;wherein the cutting cover can be adjusted between the first limit position and the second limit position, and wherein the first limit position and the second limit position are the two limit positions that the cutting cover can reach when rotating in opposite directions about the output shaft; and wherein, when the cutting cover is at the first limit position, the third housing has a first contact surface with the workpiece, and wherein, when the cutting cover is at the second limit position, the third housing has a second contact surface with the workpiece;and a third contact surface arranged on the third housing, wherein the cutting element can reach its maximum cutting depth when the third contact surface is in contact with the workpiece, and wherein the third contact surface is provided as a circular arc surface with a fixed radius of curvature, and wherein the radius of curvature is greater than or equal to 13 mm.;

[0022] In one embodiment, the in-plane projection of the third contact surface is located between the in-plane projection of the first contact surface and the in-plane projection of the second contact surface when viewed in a plane perpendicular to the output shaft.

[0023] In one embodiment, the first contact surface is tangent to the third contact surface and the second contact surface is tangent to the third contact surface when viewed in a plane perpendicular to the output shaft.

[0024] In one embodiment, the projection of the cutting cover in a direction perpendicular to the output shaft includes a first cover edge and a second cover edge; wherein, when the cutting cover is at a first limit position, the first cover edge is oriented substantially parallel to the first contact surface; and wherein, when the cutting cover is at a second limit position, the second cover edge is oriented substantially parallel to the second contact surface.

[0025] This application has the following advantages: The cutting tool and the handheld tool developed by the present application, with the arrangement of the third housing and the first contact surface and second contact surface provided on the third housing, limit the cutting angle to greater than or equal to 95 degrees while achieving a cutting depth of greater than or equal to 20 mm. With this arrangement, the same maximum cutting depth can be achieved whether the user uses the tool with the left or right hand or performs a cutting operation at different cutting angles, and the cutting angle is also kept within a suitable range, thereby optimizing user-friendliness. BRIEF DESCRIPTION OF THE CHARACTERS Fig. 1 shows a schematic diagram of a cutting tool provided by the present application; Fig. 2 shows a schematic diagram of the internal structure of a Fig. 1 cutting tool shown; Fig. 3 shows a top view of a Fig. 1 cutting tool shown; Fig. 4 shows an exploded view of a partial structure of a head assembly according to Fig. 1; Fig. 5a shows a side view of a cutting cover according to Fig. 1 when it is set to the first limit position; Fig. 5b shows a side view of a cutting cover according to Fig. 1, when it is set to the intermediate position; Fig. 5c shows a side view of a cutting cover according to Fig. 1 when it is set to the second limit position; Fig. 6 shows a bottom view of a substructure according to Fig. 1; Fig. 7 shows a partially enlarged schematic diagram of a head assembly and a cutting cover according to Fig. 1; Fig. Figure 8 shows a schematic diagram of a regulation assembly according to Fig. 1. Fig. Figure 9 shows a schematic diagram of the internal structure of a fuselage assembly according to Fig. 1; Fig. 10 shows a schematic diagram of a fuselage assembly according to Fig. 1 from a different perspective; Fig. 11 shows a schematic diagram of a cutting tool according to Fig. 1 from a different perspective; Fig. 12 shows a cross-sectional view of the installation of a cover accessory and a vacuum cleaner tube according to Fig. 11. CONCRETE EMBODIMENTS

[0026] Before any embodiments of the present application are explained in detail, it should be understood that the present application is not limited to the structural details and component arrangements set forth in the following description or shown in the above accompanying drawings.

[0027] Throughout the present application, the terms "comprising," "including," "having," or any other variation thereof, are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a set of elements includes not only those elements, but also other elements not expressly listed or pertaining to such process, method, article, or device. Unless otherwise limited, an element defined by the phrase "comprising a..." does not preclude the existence of other identical elements in a process, method, article, or device comprising that element.

[0028] In the present application, the term "and / or," which describes an association relationship between connected objects, indicates that three types of relationships can exist. For example, A and / or B can mean that A exists alone, that both A and B exist, and that B exists alone. Furthermore, the character " / " in the present application generally indicates that the connected objects are in an "and / or" relationship.

[0029] In this application, the terms "connection," "combination," "coupling," and "installation" may refer to a direct connection, combination, coupling, or installation, or an indirect connection, combination, coupling, or installation. For example, a direct connection means that two parts or assemblies are connected without an intermediate link, and an indirect connection means that two parts or assemblies are each connected with at least one intermediate link, and the two parts or assemblies are connected by means of the intermediate link. Furthermore, the terms "connection" and "coupling" are not limited to a physical or mechanical connection or coupling, but may also include an electrical connection or coupling.

[0030] Throughout the present application, one of ordinary skill in the art will understand that relative terms (e.g., "about," "approximately," "substantially," etc.) used in connection with numbers or conditions include the stated values and have the meanings clear from the context. The relative term includes, for example, at least a degree of error associated with the measurement of a particular value, a tolerance caused by manufacture, assembly, use, etc., that is associated with the particular value. Such terms should also be considered to indicate a range defined by the absolute values of the two endpoints. The relative terms may refer to the addition or subtraction of a percentage (e.g., 1 percent, 5 percent, 10 percent, or more) of the stated value.Values that do not use relative terms should also be specified as specific values with tolerances. Furthermore, when specifying a relative angular relationship (e.g., substantially parallel, substantially perpendicular), "substantially" may refer to the addition or subtraction of a specific number of degrees (e.g., 1 degree, 5 degrees, 10 degrees, or more) to the specified angle.

[0031] In the context of the present application, one of ordinary skill in the art will understand that a function performed by an assembly may be a function performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, a function performed by a part may be performed by one part, an assembly, or a combination of parts.

[0032] In the present application, the terms "top", "bottom", "left", "right", "front", "back" and other orientation terms are described with reference to the orientation and positional relationships shown in the accompanying drawings and are not to be understood as limiting the embodiments of the present application. Furthermore, it should also be understood in the context that when an element is referred to as being "above" or "below" another element, it can not only be directly connected "above" or "below" the other element, but can also be indirectly connected "above" or "below" the other element via an intermediate element. It should also be understood that the terms top, bottom, left side, right side, front, back, etc. do not only represent main directions, but can also be understood as lateral directions. The term "bottom" can, for example,“directly below”, “bottom left”, “bottom right”, “front below” and “back below”.

[0033] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. When the "controller," "processor," "central processing unit," "CPU," and "MCU" units are used to perform specific functions, those functions may be performed by a single unit or by multiple units, unless otherwise noted.

[0034] In this application, the terms “device,” “module,” or “unit” may be implemented in hardware or software to perform a particular function.

[0035] In this application, the terms “compute,” “evaluate,” “control,” “determine,” “identify,” etc., refer to operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0036] The present application provides a cutting tool 100 or a handheld tool, which may in particular be an angle grinder or an angle cutter, which may be equipped with various grinding and cutting wheels and is suitable for grinding and cutting various steels, plastics, wood, tiles and other materials.

[0037] As in Fig. 1 and Fig. 3, the cutting tool 100 includes a body assembly 10 and a head assembly 20. The body assembly 10 includes a first housing 111 for handholding, and the first housing 111 can also be said to form a holding portion 1111 for the user to hold. The head assembly 20 includes an electric motor 12, a cover 20, a second housing 112, a third housing 113, an output shaft 163, and a transmission assembly 16. The electric motor 12 is housed in the second housing 112, and the electric motor 12 includes a motor shaft that rotates about a second axis 102. The first housing 111 and the second housing 112 are arranged sequentially from front to back.

[0038] The cutting tool 100 can be powered by a battery pack 40 or by AC power. In the present embodiment, the first housing 111 extends along a front-to-back direction of the cutting tool 100, and one end of the first housing 111 is connected to the second housing 112, and the other end forms or is connected to a battery pack connecting portion 13 for installing the battery pack 40.

[0039] It should be noted that Fig. 2 is merely a schematic diagram of the transmission assembly 16 of the cutting tool 100, and the housing in which the electric motor 12 and the transmission assembly 16 are Fig. 2 is also merely a schematic diagram. The specific first housing 111, the second housing 112 and the third housing 113 must be referred to the parts indicated by the labels in the accompanying drawings, with the exception of Fig. 2 are specified.

[0040] The output shaft 163 is provided for installing a cutting element for cutting a workpiece, and the cutting element may be a sanding blade or a saw blade, etc. It should be understood that the cutting element is removable and can be replaced as needed. The electric motor 12 is capable of driving the cutting element to rotate about the first axis 101 to perform the operation. In the present embodiment, the first axis 101 and the second axis 102 are substantially parallel. The distance between the first axis 101 and the second axis 102 can be greater than or equal to 10.5 mm and less than or equal to 15.8 mm. In the present embodiment, the distance between the first axis 101 and the second axis 102 is approximately 13.21 mm.

[0041] The transmission assembly 16 is connected between the motor shaft and the output shaft 163 and transmits the driving force of the electric motor 12 to the output shaft 163. In the present embodiment, the transmission assembly 16 includes gears that are at least partially disposed within the third housing 113. The transmission assembly 16 includes a drive gear 161 and a driven gear 162, with the drive gear 161 being disposed on the motor shaft and the driven gear 162 being disposed on the output shaft 163, and with the drive gear 161 meshing with the driven gear 162. The transmission assembly 16 transmits the speed and torque of the electric motor 12 to the output shaft 163, and the transmission assembly 16 can reduce the speed of the electric motor 12 before transmitting it to the output shaft 163.

[0042] At least a portion of the transmission assembly 16 is housed in the third housing 113. In the present embodiment, a larger portion of the transmission assembly 16 is housed in the third housing 113 than in the second housing 112. It can also be said that part of the transmission assembly 16 is housed in the second housing 112 and another portion is housed in the third housing 113. The second housing 112 and the third housing 113 are combined into a single unit, housing structures such as the electric motor 12 and the transmission assembly 16 of the cutting tool 100. During a cutting operation of the cutting tool 100, the third housing 113 is in direct contact with the workpiece and forms a contact surface. The entire assembly of the first housing 111, the second housing 112, and the third housing 113 is referred to as the main housing 11.In the present application, the term “workpiece” refers to the workpiece to be cut with the cutting tool 100.

[0043] The cutting cover 21 is installed on the third housing 113. The cutting cover 21 covers at least a part of the cutting element when the cutting tool 100 performs a cutting operation, so that debris generated by the cutting element during the cutting operation can be blocked by the cutting cover 21. The cutting cover 21 covers the cutting element in the radial direction and can rotate about the output shaft 163. The cutting cover 21 is capable of rotating about the first axis 101 relative to the main housing 11, which facilitates adjustment of the position of the cutting cover 21 as needed and can play a good role in blocking debris.

[0044] The cutting tool 100 further includes a main switch 14 and a circuit board, wherein the main switch 14 is used to control the start and stop of the electric motor 12. In one embodiment, the circuit board is arranged in the first housing 111, wherein the electric motor 12 and the circuit board are connected to each other by the main switch 14, and wherein the battery pack 40 can supply power to the circuit board.

[0045] As in Fig. 2, the head assembly 20 includes a transmission assembly 16, wherein the gear center-to-center distance between the drive gear 161 and the driven gear 162 of the transmission assembly is greater than or equal to 11 mm and less than or equal to 15 mm. In one embodiment, the gear center-to-center distance between the drive gear 161 and the driven gear 162 can be 12 mm, 13 mm, or 14 mm. The pitch diameter of the drive gear 161 is approximately 15.16 mm, and the pitch diameter of the driven gear 162 is approximately 10.37 mm. The drive gear 161 and the driven gear 162 form a transmission ratio of 19:13.With this arrangement, the gear structure of the transmission assembly 16 forms a smaller area along the plane perpendicular to the motor shaft, so that the transmission assembly 16 can be accommodated within an inner diameter of the second housing 112, the boundaries of the third housing 113 and the second housing 112 being substantially flush in a forward direction, and the third housing 113 not protruding from the second housing 112, so that the entire machine is more harmoniously proportioned and the volume of the head assembly 20 is smaller. The maximum outer diameter T of the head assembly 20 is less than or equal to 55 mm. In some embodiments, the maximum outer diameter T of the head assembly 20 may be 48 mm, 50 mm, 52 mm, or 54 mm.

[0046] The head assembly 20 further includes a shaft locking structure 17, wherein the shaft locking structure 17 includes a shaft locking knob 171, a shaft locking rod 172, and a first elastic member 173. When the shaft locking knob 171 is pushed upward, the first elastic member 173 is compressed, and the shaft locking rod 172 is inserted upward into a slot provided on the output shaft 163 to prevent rotation of the output shaft 163. When the shaft locking knob 171 is pushed again, the first elastic member 173 is restored, and the shaft locking rod 172 pops out of the slot of the output shaft 163.

[0047] As in Fig. 3, the holding portion 1111 of the body assembly 10 extends from the second housing 112 to the battery pack connecting portion 13. The holding portion 1111 has a plurality of different outer diameters. The holding portion 1111 forms a minimum first outer diameter D1 at a transitional junction with the battery pack connecting portion 13, wherein the first outer diameter D1 is less than or equal to 40 mm. In some embodiments, the first outer diameter D1 may be 35 mm, 36 mm, 37 mm, 38 mm, or 39 mm. In the present embodiment, the area where the first outer diameter D1 is located is the outermost extent of the area that can be held by a user.The holding portion 1111 forms a second outer diameter D2 at a center point in a front-to-back direction, wherein the second outer diameter D2 is located at a geometric center of the entire holding region in the front-to-back direction. The second outer diameter D2 can be approximately 41 mm, 43 mm, or 45 mm. In the present embodiment, the holding region outside the main switch 14 is the part of the holding portion 1111 with the maximum outer diameter. The outer diameter of the holding region outside the main switch 14 is a third outer diameter D3, wherein the third outer diameter D3 is less than or equal to 50 mm. In some embodiments, the third outer diameter D3 is approximately 42 mm, 44 mm, 46 mm, or 48 mm.

[0048] The ratio of the maximum outer diameter T of the head assembly 20 to the second outer diameter D2 of the retaining portion 1111 is greater than or equal to 1.05 and less than or equal to 1.37. In one embodiment, the ratio of the maximum outer diameter T to the second outer diameter D2 is greater than or equal to 1.1 and less than or equal to 1.3. In some embodiments, the ratio of the maximum outer diameter T to the second outer diameter D2 is about 1.19.

[0049] As in Fig. 4, the second housing 112 includes an upper housing 1121 and a lower housing 1122, with the upper housing 1121 and the lower housing 1122 being fitted together. The second housing 112 further includes a side housing 1123, and when the upper housing 1121 and the lower housing 1122 are fitted together, the side housing 1123 is installed on the same side of the upper housing 1121 and the lower housing 1122, on the left side in the present embodiment. A first screw 1124 is used to fasten the side housing 1123 to the upper housing 1121 and the lower housing 1122. In the present embodiment, the first screws 1124 are provided in a number of 2. The drive gear 161 is housed within the side housing 1123. In some embodiments, the output end of the motor shaft of the electric motor 12 may also extend into the side housing 1123.

[0050] The third housing 113 is located on the left side of the side housing 1123, or alternatively, the third housing 113 is located between the cutting cover 21 and the side housing 1123. At least a part of the transmission assembly 16 is housed in the third housing 113. The third housing 113 and the second housing 112 are fastened by screws. The third housing 113 is sealed by a second screw 1125 that passes through the side housing 1123 and projects into the upper housing 1121 and the lower housing 1122. In the present embodiment, the second screws 1125 are provided in a number of two. A washer 22 is provided on the left side of the cutting cover 21, and a third screw 1126 passes through the washer 22 to rotatably fasten the cutting cover 21 to the third housing 113.In the present embodiment, the third screws 1126 are provided in a number of 3.

[0051] In the present embodiment, the third housing 113 and the side housing 1123 are made of the same material and are both made of aluminum alloy. The upper housing 1121 and the lower housing 1122 are made of the same material and are both made of plastic. The receiving space formed by the third housing 113 and the side housing 1123 accommodates the transfer assembly 16, and the third housing 113 can come into contact with the workpiece during the cutting process. In one embodiment, the side housing 1123 can be made of the same material as the upper housing 1121 and the lower housing 1122. There is no limitation on the material of each housing.

[0052] The connection of the side housing 1123 to the upper housing 1121 and the lower housing 1122, and the connection of the third housing 113 to the side housing 1123, use a hidden structure. This means that there are no screws on the outer peripheral surface of the housings along the second axis 102. Therefore, the second housing 112 and the third housing 113 are complete cylindrical surfaces and have no externally visible screws. This is visually appealing and has a simple structure with a small volume. When the head assembly 20 rotates around the third straight line 103, it can still perform a cutting operation without being restricted by the position of the screws.

[0053] As in connection with Fig. 4 and Fig. 1, the cutting assembly 100 further includes an illumination assembly 30 including a first illumination element 31 and a second illumination element 32 disposed above and below. The first illumination element 31 is disposed in the upper housing 1121, wherein the upper housing 1121 includes a first opening 311, and the light from the first illumination element 31 passes through the first opening 311. The second illumination element 32 is disposed in the lower housing 1122, wherein the lower housing 1122 includes a second opening 321, and the light from the second illumination element 32 passes through the second opening 321.The first lighting element 31 and the second lighting element 32 are arranged symmetrically along the parting surfaces of the upper housing 1121 and the lower housing 1122, and with the arrangement, the lighting of the cutting assembly 100, when in operation, can be compatible with left- and right-handed cutting, so that the work area can be illuminated regardless of which work position is used.

[0054] When the main switch 14 is actuated to turn on the cutting assembly 100, the rotation of the electric motor 12 supplies power to the circuit board and turns on the lighting assembly 30. When the main switch 14 is actuated to turn off the cutting assembly 100, the lighting assembly 30 is turned off with a time delay compared to the standstill of the cutting element.

[0055] As in Fig. As shown in Figure 4, the third housing 113 has a first contact surface 1131 and a second contact surface 1132. A transition surface 1133 is further formed between the first contact surface 1131 and the second contact surface 1132, and the transition surface 1133 connects the first contact surface 1131 and the second contact surface 1132 to each other. When the user cuts a workpiece, as the cutting element gradually protrudes into the interior of the workpiece, the first contact surface 1131 or the second contact surface 1132 gradually comes close to the workpiece until it touches it. The cutting tool 100 reaches a maximum cutting depth when the first contact surface 1131 or the second contact surface 1132 touches the surface of the workpiece to be cut.In the present embodiment, the transition surface 1133 does not come into contact with the workpiece during the cutting process due to its size compared to the first contact surface 1131 and the second contact surface 1132.

[0056] In the present embodiment, the first contact surface 1131 and the second contact surface 1132 are substantially planar. In other possible embodiments, the first contact surface 1131 may be formed by at least one contact point; for example, the upper side of a protruding structure may also form the first contact surface 1131. When the workpiece is in point contact with the cutting tool 100, the at least two contact points together form a contact plane, which may be understood as the first contact surface 1131 in the present embodiment. Similarly, the second contact surface 1132 may also be defined in the same way.

[0057] The Fig. 5a to 5c show schematic diagrams of the cutting cover 21 when rotated to different positions. In the present embodiment, the cutting cover 21 is rotatable relative to the main housing 11. The cutting cover 21 can be adjusted between a first limit position and a second limit position, where the first limit position and the second limit position are the two limit positions that the cutting cover 21 can reach when rotating in opposite directions about the output shaft 163. When the cutting cover 21 is at the first limit position, the third housing 113 has a first contact surface 1131 with the workpiece; when the cutting cover 21 is at the second limit position, the third housing 113 has a second contact surface 1132 with the workpiece.

[0058] Fig. Fig. 5a shows a schematic diagram of the cutting cover 21 rotated to the first limit position, and at this position the cutting assembly 100 can cut a workpiece located mainly on its upper surface. Fig. 5b and Fig. 1 show schematic diagrams of the cutting cover 21 rotated to the intermediate position, and at this position the cutting assembly 100 can cut a workpiece located mainly on its front side. Fig. Figure 5c shows a schematic diagram of the cutting cover 21 rotated to the second limit position, at which position the cutting assembly 100 can cut a workpiece located primarily on its underside. When the cutting cover 21 is adjusted between the first limit position and the second limit position, the user can cut the workpiece in all directions by rotating it to adjust the angle of the hand relative to the workpiece.

[0059] When viewed from the left side of the cutting tool 100, the cutting cover 21 can be rotated clockwise from the intermediate position by a first angle γ1 to the first limit position, or counterclockwise from the intermediate position by a second angle γ2 to the second limit position. In the present embodiment, the first angle γ1 is 75 degrees, and the second angle γ2 is also 75 degrees. The first angle γ1 and the second angle γ2 can be the same or different. In one embodiment, the first angle γ1 and the second angle γ2 are both 60 degrees. In one embodiment, the first angle γ1 and the second angle γ2 are both 70 degrees. The larger first angle γ1 and the larger second angle γ2 allow the user to perform a cutting operation when the cutting cover 21 is rotated in a wider range to facilitate operation. As shown in Fig. 5a, the cutting cover 21 is rotated to the first limit position, and a cutting operation is performed, and the cutting tool 100 reaches a maximum cutting depth when the first contact surface 1131 contacts the workpiece to be cut. As shown in Fig. As shown in Figure 5b, the cutting cover 21 is rotated to the second cutting position, and a cutting operation is performed when the cover end surface 211 and the washer end surface 221 gradually come close to the workpiece until they come into contact, and the cutting element cuts to the deepest position. Since, in the present embodiment, the cover end surface 211 and the washer end surface 221 are part of a circle, the workpiece can come into contact with any point of the cover end surface 211 and the washer end surface 221. As shown in Fig. 5c, the cutting cover 21 is rotated to the second limit position, and a cutting operation is performed, and the cutting tool 100 reaches a maximum cutting depth when the second contact surface 1132 contacts the workpiece to be cut.

[0060] As in Fig. 5a and Fig. As shown in Figure 5c, the projection of the cutting cover 21 in a direction perpendicular to the output shaft 163 includes a first cover edge 212 and a second cover edge 213. When the cutting cover 21 is at the first limit position, the first edge 212 is oriented substantially parallel to the first contact surface 1131; when the cutting cover is at the second limit position, the second edge 213 is oriented substantially parallel to the second contact surface 1132.

[0061] That is, the third housing 113 has a first contact surface 1131 and a second contact surface 1132 with the workpiece when the cutting element cuts the workpiece; wherein the cutting element has a maximum cutting depth when the first contact surface 1131 and the second contact surface 1132 are in contact with the workpiece.

[0062] Referring to Fig. 4 to 7, the cutting cover 21 has a cover end surface 211, the cover end surface 211 being the frontmost side of the Fig. 1. In the present embodiment, the cover end surface 211 of the cutting cover 21 is in contact with the workpiece when the cutting element cuts to the maximum depth.

[0063] As in Fig. 7, the washer 22 in the present embodiment is also circular, and the radius of the washer 22 corresponds to the distance between the center of rotation of the cutting cover 21 and the cover end surface 211. When the washer 22 is installed on the cutting cover 21, the part of the washer 22 which is located at the Fig. 1, the washer end surface 221. When viewed in the left-right direction of the cutting tool 100, the outer contour of the washer 22 at least partially substantially overlaps with the outer contour of the cutting cover 21. In the present embodiment, the washer end surface 221 substantially overlaps with the cover end surface 211. In the present embodiment, the cover end surface 211 and the washer end surface 221 jointly contact the workpiece when the cutting element cuts to the maximum depth.

[0064] The third housing 113 further includes a housing end surface 1134, wherein the housing end surface consists of a segment of the circular arc surface, and wherein the housing end surface 1134 is the end surface on the third housing 113 that is closest to the front side. That is, when the third housing 113 is installed on the second housing 112, the circular arc surface on the third housing 113 is at the Fig. 1, the housing end face 1134. Assuming that the workpiece is placed directly in front of the cutting tool 100, ie that the cutting cover 21 is adjusted to be in a position as in Fig. 5b, the housing end surface 1134 is the surface on the third housing 113 that is closest to the workpiece.

[0065] The cutting tool 100 includes a washer end surface 221, a cover end surface 211, and a housing end surface 1134 in the order from left to right in the direction along the first axis 101. When the third contact surface 1135 is defined to be at least one of the washer end surface 221, the cover end surface 211, and the housing end surface 1134, the cutting tool 100 achieves a maximum cutting depth when the third contact surface 1135 is in contact with the workpiece. The third contact surface 1135 is located between the first contact surface 1131 and the second contact surface 1132. "Between" here means that the in-plane projection of the third contact surface 1135 is between the in-plane projection of the first contact surface 1131 and the in-plane projection of the second contact surface 1132 when viewed in a plane perpendicular to the output shaft.

[0066] The third contact surface 1135 is provided as a circular arc surface with a fixed radius of curvature, wherein the radius of curvature of the circular arc surface is greater than or equal to 13 mm. In some embodiments, the radius of curvature of the third contact surface 1135 can be 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, or 20 mm. In an example for the assembly of a saw blade with a diameter of 76 mm, the maximum cutting depth is 22 mm when the third contact surface 1135 has a radius of curvature of 16 mm. When viewed in a plane perpendicular to the output shaft, the first contact surface 1131 is tangent to the third contact surface 1135, and the second contact surface 1132 is tangent to the third contact surface 1135 (see Fig. 5b and Fig. 6). With this arrangement, the maximum cutting depth obtained remains the same even when the cutting cover 21 of the cutting tool 100 is rotated at any angle and the user pushes the cutting tool 100 to the deepest point of the workpiece. In other words, the user does not need to adjust the cutting tool 100 to a specific angle when using the cutting tool 100 to push the cutting blade to the deepest point, and this advantageous effect greatly improves the user experience.

[0067] In one embodiment, when the cutting cover 21 is in an intermediate position, as in Fig. As shown in Figure 5b, the housing end surface 1134 may be in contact with the workpiece to allow the cutting element to cut to the maximum depth. That is, the third contact surface 1135 includes a housing end surface 1134, and the cover end surface 211, the washer end surface 221, and the housing end surface 1134 may all simultaneously contact the workpiece, at which time the cutting tool 100 reaches the cutting depth.

[0068] In one embodiment, the third contact surface 1135 includes only the cover end surface 211 and the washer end surface 221, and the housing end surface 1134 cannot contact the workpiece. In the present embodiment, the housing end surface 1134 is slightly lower than the cover end surface 211 and the washer end surface 221 due to manufacturing and installation errors.

[0069] It should be noted that the cutting cover 21 may also have contact surfaces other than the first contact surface 1131 and the second contact surface 1132 when it is located at the two limit positions, but the cutting device 100 forms a maximum cutting depth only when the first contact surface 1131 and the second contact surface 1132 are in contact with the workpiece.

[0070] As in Fig. 6, a first angle α is formed between the first contact surface 1131 and the second contact surface 1132, which is greater than or equal to 50 degrees and less than or equal to 85 degrees. In one embodiment, the first angle α is greater than or equal to 60 degrees and less than or equal to 85 degrees. In some embodiments, the first angle α may be 73 degrees, 75 degrees, 78 degrees, 80 degrees, or 82 degrees, etc. The angle β of the cutting tool 100 is complementary to the first angle α, such that the angle β is greater than or equal to 90 degrees and less than or equal to 120 degrees. In some embodiments, the cutting angle β may be 98 degrees, 100 degrees, 102 degrees, 105 degrees, or 107 degrees, etc. If the cutting angle β is within the above ranges, the cutting tool 100 has a maximum cutting depth of 22 mm.In some embodiments, the maximum cutting depth of the cutting tool 100 may be 20 mm, 21 mm, 22 mm, 23 mm or 24 mm.

[0071] The battery pack 40 has a nominal voltage of greater than or equal to 8 V and less than or equal to 36 V. In some embodiments, the nominal voltage of the battery pack 40 may be 12 V, 16 V, 20 V, or 24 V, etc. The maximum output power of the battery pack 40 is greater than or equal to 250 W and less than or equal to 600 W. In some embodiments, the maximum output power of the battery pack 40 may be 300 W, 320 W, 340 W, 380 W, 400 W, or 450 W, etc.

[0072] The total weight of the cutting tool 100 is the total weight of the cutting tool 40 when the battery pack 40 is installed on the cutting tool, and the total weight of the cutting tool 100 is greater than or equal to 1000 g. In some embodiments, the total weight of the cutting tool 100 may be 1100 g, 1200 g, or 1300 g. The empty weight of the cutting tool 100 is the weight of the cutting tool 100 without the battery pack 40, and the cutting tool 100 has an empty weight of greater than or equal to 700 g. In some embodiments, the empty weight of the cutting tool 100 may be 750 g, 800 g, or 850 g.

[0073] The power-to-mass ratio of the cutting tool 100 is defined as the ratio between the power output of the battery pack 40 and the mass of the entire machine. The power-to-mass ratio is greater than or equal to 0.22 and less than or equal to 0.35. In some embodiments, the power-to-mass ratio is approximately 0.24, 0.26, 0.28, or 0.3. The power output of the electric motor 12 is greater than or equal to 200 W. In one embodiment, the power output of the electric motor 12 is greater than or equal to 250 W. In some embodiments, the power output of the electric motor 12 may be 280 W, 300 W, or 330 W.

[0074] As in connection with Fig. 3 and Fig. As shown in Figure 8, the battery pack connecting portion 13 is provided with a control assembly 15 on the upper housing. The control assembly 15 is a communication channel between the user and the cutting tool 100. The user controls the electric motor 12 and the cutting element and other user-controllable parts via the control assembly 15. The control assembly 15 includes a control portion 151 and a display portion 152. The control portion 151 includes a first control button 1511 and a second control button 1512. The first control button 1511 is used to control the speed of the electric motor 12, and the second control button 1512 is used to switch the forward and reverse rotation of the output shaft 163. The display portion 152 is used to display the speed ratio and information about the forward and reverse rotation of the cutting tool 100.

[0075] The first row of the display section 152 is equipped with four LEDs, each corresponding to the numbers "1", "2", "3", and "4", and the second row is equipped with two LEDs, each corresponding to the letters "F" and "R". The numbers in the first row represent the speed gear in which the cutting tool 100 is located, and the letters in the second row represent that the cutting tool 100 is in forward or reverse rotation mode. The first control button 1511 is provided with an arrow shape, and the speed of the motor 12 is increased or decreased by pressing the first control button 1511. For example, when the first control button 1511 is pressed for the first time, the speed gear is in first gear, and after the first control button 1511 is released, the speed gear is increased to second gear by pressing the first control button 1511 again.Starting from the first gear, each press of the first control button 1511 increases the speed gear by one gear until the fourth gear is reached. When the speed gear is increased to fourth gear, each press of the first control button 1511 decreases the speed gear by one gear until the fourth gear is reached. The corresponding LED light illuminates each time the gear is changed.

[0076] The second control button 1512 is located on the other side of the first control button 1511, opposite the display section 152, and the second control button 1512 is labeled with the letters "F / R." When the second control button 1512 is pressed for the first time, the cutting tool 100 rotates in the forward direction, and the LED light of the letter "F," which is closest to the second row of the display section 152, lights up. When the second control button 1512 is pressed again, the cutting tool 100 is set to rotate reversely, and the LED light of the letter "R," which is closest to the second row of the display section 152, lights up. Pressing the second control button 1512 causes the cutting tool 100 to cycle, which is indicated by the LED light illuminating.It should be noted that the indicator light of the display section 152 does not necessarily have to be LED lights, but can also be other forms of indication, which are not limited here. The forward rotation and reverse rotation can also be indicated by letters or symbols other than "F" and "R," which are not limited here.

[0077] With the arrangement, the regulation assembly 15 of the cutting tool 100 is arranged on the boom, and the speed control and direction change functions are integrated into the same interface, which contributes to reducing the overall size of the control panel, reducing the space it occupies on the machine body, and facilitating regulation by the user.

[0078] In one embodiment, after the second control button 1512 is pressed to set the direction of rotation, the circuit board remembers the current direction of rotation so that the direction of rotation used before the last power failure can be maintained when the cutting tool 100 is turned off or when the cutting tool 100 is turned on again after the battery pack 40 has been reinserted.

[0079] In one embodiment, after actuating the second control button 1512 to set the rotation direction, the cutting tool 100 rotates in the first rotation direction. When the cutting tool 100 is stopped, the time between the stop and the time before the next power-on is a wait time. If the wait time is shorter than the preset stop time, the cutting tool 100 is set to continue operating in the first rotation direction when it is turned on again after the stop time. If the wait time is longer than the preset stop time, the cutting tool 100 is set to operate in the forward direction when it is turned on again after the stop time. The preset stop time may be less than or equal to 30 minutes. In some embodiments, the preset stop time may be 5 minutes, 10 minutes, 15 minutes, 20 minutes, or 25 minutes.For example, the user presses the second control button 1512 to set the first rotation direction to reverse rotation, and the preset idle time is 10 minutes. After the cutting tool 100 has been running for a while, the user briefly leaves the machine, and the machine is stopped for 5 minutes. When the user returns and continues to turn on the cutting tool, the cutting tool 100 will still be in the reverse rotation direction after being turned on again, because the actual idle time is less than the preset idle time.

[0080] In another embodiment, the second control button 1512 has a long-press function and a short-press function, wherein the long-press function can switch the cutting tool 100 to the memory mode or the reset mode, and wherein the short-press function can enable the second control button 1512 to normally change the rotation direction. The memory mode means that the cutting tool 100 always remains in the current rotation direction after stopping and turning off or replacing the battery pack 40, and the reset mode means that the cutting tool 100 automatically returns to the forward rotation direction after stopping and turning off or replacing the battery pack 40.When the cutting tool 100 is used for the first time, it is in reset mode. A long press of the second control button 1512 switches the cutting tool 100 to memory mode, and another long press of the second control button 1512 switches the cutting tool 100 to reset mode, and so on. The short press function can be a continuous press of the second control button 1512 for 3 to 5 seconds, or the second control button 1512 can be pressed for a significantly longer period than the short press function.

[0081] As in Fig. 2, Fig. 9 and Fig. 10, the head assembly 20 of the cutting tool 100 can rotate about the body assembly 10. As shown in Fig. 2, the body assembly 10 extends along a third straight line 103, and the head assembly 20 can rotate about the third straight line 103. In the present embodiment, the direction of rotation of the head assembly 20 is a clockwise rotation, see first direction R in Fig. 2.

[0082] The Fig. 9 and Fig. 10 show how the head assembly 20 rotates relative to the body assembly 10. 20The cutting tool 100 is provided with a head adjustment assembly 18 arranged on the first housing 111 and / or the second housing 112, wherein, when the head adjustment assembly 111 is actuated, the head assembly 20 can rotate relative to the body assembly 10.

[0083] The head adjustment assembly 18 includes an adjustment switch 181, a locking pin 182, and a second elastic member 183. When the user wishes to rotate the head assembly 20, the adjustment switch 181 must be operated, and the locking pin 182 is set in motion by the adjustment switch 181 and then pulled out from the interior of the housing of the head assembly 20, thereby realizing the unlocking of the head assembly 20. When the head assembly 20 is rotated to a desired angle, the adjustment switch 181 is then adjusted so that the locking pin 182 protrudes into the interior of the housing of the head assembly 20, thereby realizing the locking of the head assembly 20. In the present embodiment, the head assembly 20 can be further rotated by 90 degrees or 180 degrees, wherein the Fig. The position shown in Figure 1 is the position in which the head assembly 20 is not rotated or is rotated by 0 degrees. In other embodiments, different angles of rotation for the head assembly 20 can be set.

[0084] The adjustment switch 181 is provided with a drive portion 1811, and the drive portion 1811 can drive the locking pin 182 to move along its extending direction. The locking pin 182 is provided with a positioning member 1821, and the positioning member 1821 is in contact fit with the drive portion 1811. In one embodiment, the drive portion 1811 can push the positioning member 1821 in a direction substantially parallel to the drive portion 1811, thereby driving the locking pin 182 to move. In another embodiment, the positioning member 1821 can pass through the drive portion 1811 in a direction non-parallel to the moving direction of the drive portion 1811, thereby driving the locking pin 182 to move.

[0085] The head assembly 20 further includes a pivot rail 184 on which the head assembly 20 and the body assembly 10 can perform relative rotations. Alternatively, the relative rotational movement between the first housing 111 and the second housing 112 is generated on the pivot rail 184. The pivot rail 184 can be provided at the forwardmost end of the first housing 111 or at the lowermost end of the second housing 112 and can also serve as a separate component connecting the first housing 111 to the second housing 112. The pivot rail 184 has at least one recessed rail, and the pivot rail 184 is distributed in a circular pattern. In the present embodiment, the rotary rail 184 is formed by the second housing 112, and accordingly, a slide track that can fit with the rotary rail 184 is also formed on the first housing 111 to realize the relative movement of the first housing 111 and the second housing 112.

[0086] A plurality of locking holes 1841 are formed on the housing of the rotary bar 184, and each locking hole 1841 can be used to insert the locking pin 182. A second elastic member 183 is provided on the back of the positioning member 1821. When the locking pin 182 is in a locked state, the second elastic member 183 is compressed to ensure that the locking pin 182 is pushed upward into the locking holes 1841 and does not fall out; when the locking pin 182 is unlocked, the second elastic member 183 continues to be compressed. The user's hand provides the force to compress the second elastic member 183 to prevent the adjustment switch 181 from being accidentally touched.

[0087] The internal structure of the main switch 14 is also shown in the views of Fig. 9 and Fig. 10. The main switch 14 is arranged on the first housing 111. When the head adjustment assembly 18 is operated, operation of the main switch 14 is restricted. The lower end of the main switch 14 is connected to a switching lever 141. The forward end of the switching lever 141 forms a projection 1411, and a groove 142 for inserting the projection 1411 is formed on the rotating rail 184. When the head assembly 20 is at a lockable angle with the body assembly 10, the main switch 14 is pushed forward, and the switching lever 141 can be inserted into the groove 142. It should be noted that only after the locking pin 182 is locked in a correct position can the projection 1411 on the switching lever 141 engage the groove 142 and the main switch 142 be properly activated.When the locking pin 182 is in an abnormal position, the projection 1411 presses against the ribbed surface, so that the main switch 142 cannot be pressed and the machine cannot be activated.

[0088] As in Fig. 11 and Fig.12, the cutting tool 100 further includes a cover accessory 23 detachably installed on the cutting cover 21. In the present embodiment, the cover accessory 23 is fitted on the cutting cover 21, and at least one vacuum cleaner tube 24 is detachably installed on the cover accessory 23. In the present embodiment, both ends of the cover accessory 23 can be connected to the vacuum cleaner tube 24. The cutting direction of the cutting tool 100 can be rotated in a first direction R, that is, the cover 21 and the cover accessory 23 mating with the cover 21 can be located on the left or right side of the holding portion 1111. Therefore, the installation position of the vacuum cleaner tube 24 can be selected in accordance with the cutting direction and the rotation direction of the saw blade to adapt to different working conditions.

[0089] The cover accessory 23 is provided with an oppositely arranged first actuating element 231 and a second actuating element 232, wherein both the first actuating element 231 and the second actuating element 232 can be used individually to lock and unlock the vacuum cleaner tube 24. The cover accessory 23 further includes a cover accessory housing 233, and both the first actuating element 231 and the second actuating element 232 are installed on or connected to the cover accessory housing 233.

[0090] The first operating member 231 includes a trigger portion 2311, a limiting portion 2312, and a connecting portion 2313. The trigger portion 2311 is provided at one end portion of the first operating member 231 for operation by a user. The connecting portion 2313 is provided at the other end opposite the trigger portion, and the first operating member 231 is connected to the cover accessory housing 233 via the connecting portion 2313. In the present embodiment, the first operating member 231 is integrally formed with the cover accessory housing 233. In other embodiments, the first operating member 231 and the cover accessory housing 233 may also be formed separately and then connected to each other.The restriction portion 2312 is provided substantially in the central portion of the first operating member 231, and the first operating member 231 is formed substantially in the shape of a “√”.

[0091] The outer wall of the vacuum cleaner tube 24 is provided with a fitting portion 241. The fitting portion 241 is a slit that does not open the outer wall, so that when the user presses the trigger portion 2311, the restricting portion 2312 is released from the fitting portion 241 of the vacuum cleaner tube 24, allowing the vacuum cleaner tube 24 to slide up and down to detach from the cover accessory 23. In a natural state, the restricting portion 2312 snaps into the fitting portion 241 of the vacuum cleaner tube 24 due to the elasticity of the material of the first actuating member 231. When the user presses the trigger portion 2311, the first actuating member 231 elastically deforms, and the restricting portion 2312 is released from the fitting portion 241. In the present embodiment, the cover accessory 23 is made of a plastic material.

[0092] Angle grinders can typically be divided into conventional angle grinders and mini angle grinders. The grinding wheel diameter of conventional angle grinders is larger than that of mini angle grinders, allowing for greater cutting depths and wider cutting angles. The grinding wheel diameter of conventional angle grinders is greater than or equal to 100 mm, while the grinding wheel diameter of mini angle grinders is less than 100 mm. Due to its larger volume, conventional angle grinders have sufficient space to accommodate greater cutting depths and wider cutting angles.The present application relates to a technical solution that allows for achieving a greater cutting depth and angle even in the mini angle grinder category, and that allows the user to cut at the maximum cutting depth when the cutting cover 21 is rotated to any adjustable position. In the present embodiment, the cutting tool 100 is a mini angle grinder and is used with a grinding disc or cutting disk with a diameter of 76 mm.

[0093] In one embodiment, the diameter of the cutting element of the cutting tool 100 is greater than 60 mm and less than 100 mm. In one embodiment, the diameter of the cutting element of the cutting tool 100 is greater than 60 mm and less than 90 mm. In one embodiment, the diameter of the cutting element of the cutting tool 100 is greater than 60 mm and less than 85 mm. In the present embodiment, the cutting tool 100 is equipped with a grinding disc or cutting disk with a diameter of 76 mm for use as the cutting element.

[0094] It should be noted that the technical solution disclosed in this description can be applied to a hand-held tool, an angle grinder or an angle cutter in addition to the cutting tool 100.

[0095] The above embodiments merely illustrate the basic principles and features of the present application, and the present application is not limited by the above embodiments. The present application is capable of various changes and modifications without departing from the spirit and scope of the present application, which fall within the claimed scope of the present application. The claimed scope of the present application is defined by the claims and their equivalents.

Claims

[1] Cutting tool, comprising: a body assembly including at least a first housing for holding by a hand; a head assembly comprising: an electric motor; a second housing intended to accommodate the electric motor; an output shaft provided for the installation of a cutting element for cutting a workpiece; a transmission assembly connected between the motor shaft and the output shaft and transmitting the driving force of the electric motor to the output shaft; characterized by that it continues to include: a third housing enclosing at least a portion of the transfer assembly, wherein, when the cutting element cuts the workpiece, the third housing has a first contact surface and a second contact surface with the workpiece; and wherein the cutting element has a maximum depth of cut when the first contact surface and the second contact surface are in contact with the workpiece; and wherein the angular range between the first contact surface and the second contact surface is greater than or equal to 50 degrees and less than or equal to 85 degrees, and wherein the maximum depth of cut is greater than or equal to 20 mm. [2] Cutting tool according to claim 1, characterized by that the second housing and the third housing are fastened by screws. [3] Cutting tool according to claim 1, characterized bythat it further comprises a battery pack that supplies power to the cutting tool, the nominal voltage of the battery pack being greater than or equal to 8 V. [4] Cutting tool according to claim 1, characterized by that the output power of the electric motor is greater than or equal to 250 W. [5] Cutting tool according to claim 1, characterized by that it further comprises a head adjustment assembly arranged on the first housing and / or the second housing; wherein, when the head adjustment assembly is actuated, the head assembly can rotate relative to the body assembly. [6] Cutting tool according to claim 5, characterized by that it further comprises a main switch arranged on the first housing; wherein, when the head adjustment assembly is operated, operation of the main switch is restricted. [7] Cutting tool according to claim 1, characterized bythat it further comprises a cutting cover and a cover accessory, wherein the cutting cover covers the cutting element in the radial direction and can rotate about the output shaft; and wherein the cover accessory is detachably installed on the cutting cover; and wherein at least one vacuum cleaner tube is detachably installed on the cover accessory. [8] Cutting tool according to claim 1, characterized by that it further comprises a third contact surface, wherein the cutting element has the maximum cutting depth when the third contact surface is in contact with the workpiece. [9] Cutting tool according to claim 8, characterized by that, when viewed in a plane perpendicular to the output shaft, the projection of the third contact surface in the plane is located between the projection of the first contact surface in the plane and the projection of the second contact surface in the plane. [10] Cutting tool according to claim 9, characterized bythat it further comprises a cutting cover which covers the cutting element in the radial direction and can rotate about the output shaft; wherein the third contact surface is arranged on the cutting cover or the third housing. [11] Hand-held tool according to claim 1, characterized by that, when viewed in a plane perpendicular to the output shaft, the first contact surface is tangent to the third contact surface and the second contact surface is tangent to the third contact surface. [12] Hand-held tool according to claim 7, characterized byin that the projection of the cutting cover in a direction perpendicular to the output shaft has a first cover edge and a second cover edge; wherein, when the cutting cover is at a first limit position, the first cover edge is oriented substantially parallel to the first contact surface; and wherein, when the cutting cover is at a second limit position, the second cover edge is oriented substantially parallel to the second contact surface. [13] Hand-held tool according to claim 1, characterized by that it further comprises a third contact surface arranged on the third housing, wherein the cutting element can reach its maximum cutting depth when the third contact surface is in contact with the workpiece. [14] Hand-held tool according to claim 13, characterized bythat the third contact surface is provided as a circular arc surface with a fixed radius of curvature, wherein the radius of curvature is greater than or equal to 13 mm. [15] Hand-held tool comprising: a body assembly including at least a first housing for holding by a hand; a head assembly comprising: an electric motor; a second housing intended to accommodate the electric motor; an output shaft provided for the installation of a cutting element for cutting a workpiece; a transmission assembly housed in a third housing and connected between the motor shaft and the output shaft, which transmits the driving force of the electric motor to the output shaft; characterized by that it continues to include: a cutting cover that covers the cutting element in the radial direction and can rotate about the output shaft relative to the second housing; and wherein the cutting cover can be adjusted between the first limit position and the second limit position, and wherein the first limit position and the second limit position are the two limit positions that the cutting cover can reach when rotating in opposite directions about the output shaft; and wherein, when the cutting cover is at the first limit position, the third housing has a first contact surface with the workpiece, and wherein, when the cutting cover is at the second limit position, the third housing has a second contact surface with the workpiece; and a third contact surface arranged on the third housing, wherein the cutting element can reach its maximum cutting depth when the third contact surface is in contact with the workpiece, and wherein the third contact surface is provided as a circular arc surface with a fixed radius of curvature, and wherein the radius of curvature is greater than or equal to 13 mm. [16] Hand-held tool according to claim 15, characterized by that, when viewed in a plane perpendicular to the output shaft, the projection of the third contact surface in the plane is located between the projection of the first contact surface in the plane and the projection of the second contact surface in the plane. [17] Hand-held tool according to claim 15, characterized by that, when viewed in a plane perpendicular to the output shaft, the first contact surface is tangent to the third contact surface and the second contact surface is tangent to the third contact surface. [18] Hand-held tool according to claim 15, characterized by in that the projection of the cutting cover in a direction perpendicular to the output shaft has a first cover edge and a second cover edge; wherein, when the cutting cover is at a first limit position, the first cover edge is oriented substantially parallel to the first contact surface; and wherein, when the cutting cover is at a second limit position, the second cover edge is oriented substantially parallel to the second contact surface.

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