CN108907338B

CN108907338B - Electric circular saw

Info

Publication number: CN108907338B
Application number: CN201810919572.8A
Authority: CN
Inventors: 吉绍山; 张晨迪; 马建英
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2018-08-14
Filing date: 2018-08-14
Publication date: 2020-06-23
Anticipated expiration: 2038-08-14
Also published as: CN108907338A

Abstract

The invention relates to an electric circular saw, which comprises a shell and a bottom plate connected with the shell, wherein a motor, a transmission mechanism and an output shaft are arranged in the shell, the transmission mechanism is connected with the motor and the output shaft, and the output shaft is used for mounting a saw blade; the electric circular saw also comprises a protective cover arranged on the shell, the output shaft extends out of the shell and extends into the protective cover, and at least part of the saw blade is contained in the protective cover; the bottom plate comprises a butting surface which is contacted with the guide device, and the protective cover is provided with an outer end surface which is arranged back to the shell; the saw blade comprises a grinding sheet and a cutting sheet which can be selectively arranged on the output shaft, and when the grinding sheet is arranged on the output shaft, the outer end surface of the protective cover is coplanar with the grinding surface of the grinding sheet; when the cutting blade is arranged on the output shaft, the abutting surface is coplanar with the outer side surface of the cutting blade. The electric circular saw can realize the trimming cutting of the cutting blade and the trimming grinding of the grinding blade, improves the working efficiency and saves the using time and the cost.

Description

Electric circular saw

Technical Field

The invention relates to an electric circular saw, and belongs to the field of electric power tools.

Background

The electric circular saw is a tool which takes a single-phase series motor as power and then drives a circular saw blade to carry out sawing operation through a transmission mechanism, and has the characteristics of safety, reliability, high working efficiency and the like. The electric circular saw adopts a lifting and climbing type appearance structure and mainly comprises a motor, a reduction gearbox, a protective cover, an adjusting mechanism, a bottom plate, a handle, a switch, a non-reconnectable plug, a circular saw blade and the like. In daily work, because of the structural limitations of a bottom plate, a protective cover and the like, the electric circular saw cannot only be used for finishing the edge trimming grinding of a grinding sheet along a certain plane and finishing the edge trimming cutting of a cutting sheet along a certain plane, and other tools are often needed, so that the work efficiency is reduced, and the cost is increased.

Disclosure of Invention

The invention aims to provide an electric circular saw, which can be provided with one of a cutting blade and a grinding blade, and can realize the edge-trimming cutting of the cutting blade and the edge-trimming grinding of the grinding blade.

In order to achieve the purpose, the invention provides the following technical scheme: an electric circular saw comprises a shell and a bottom plate connected with the shell, wherein a motor, a transmission mechanism and an output shaft are arranged in the shell, the transmission mechanism is connected with the motor and the output shaft, and the output shaft is used for mounting a saw blade; the electric circular saw also comprises a protective cover arranged on the shell, the output shaft extends out of the shell and extends into the protective cover, and at least part of the saw blade is contained in the protective cover; the bottom plate comprises a butting surface for contacting with the guide device, and the protective cover is provided with an outer end surface back to the shell; the saw blade comprises a grinding sheet and a cutting sheet which are selectively arranged on the output shaft, and when the grinding sheet is arranged on the output shaft, the outer end surface of the protective cover is coplanar with the grinding surface of the grinding sheet, which is back to the shell; when the cutting blade is installed on the output shaft, the abutting surface and the outer side surface of the cutting blade, which is back to the shell, are coplanar.

Further, the shield comprises a fixed shield and a movable shield arranged in the fixed shield, and the movable shield can rotate around the axis of the output shaft to shield and expose part of the cutting blade. The fixed shield is used for protecting, positioning and assisting dust collection of the saw blade, and the movable shield is used for protecting and blocking the cutting blade.

Furthermore, move and be equipped with on the guard shield and supply outside application of force in order to drive to move the guard shield and around the axis pivoted of output shaft and dial the button, decide to have seted up the arc breach on the guard shield, dial the button and pass the arc breach setting.

Furthermore, the fixed protective cover is divided into an inner protective cover and an outer protective cover by the arc-shaped notch; in the axis direction of output shaft, the inner protective cover is close to the casing setting for the outer protective cover, and the inner protective cover is used for the holding cutting piece, and the outer protective cover is used for the holding grinding piece.

Further, the outer guard shield includes outer terminal surface and the outer guard shield global of being connected with outer terminal surface, and wherein outer guard shield global and outer terminal surface personally submit 90 degrees contained angles.

Furthermore, the toggle button can slide along the peripheral surface of the outer shield.

Further, the radius of the inner shroud is greater than the radius of the outer shroud.

Further, at least one of the inner shield, the outer shield and the movable shield is in an arc-shaped structure.

Further, a first mounting space for mounting the grinding sheet and a second mounting space for mounting the cutting sheet are defined in the shield; a first plane is defined in the first mounting space, and the first plane is the position of a grinding surface, back to the shell, in the grinding sheet after the grinding sheet is mounted; a second plane is defined in the second mounting space, and the second plane is the position of the outer side surface of the cutting blade after the cutting blade is mounted; the outer end face is located in the extension face of the first plane, and the abutting face is located in the extension face of the second plane.

Further, the fixed shield includes an inner shield forming the first mounting space and an outer shield forming the second mounting space, and the inner shield is disposed close to the housing with respect to the outer shield in the axial direction of the output shaft.

Furthermore, an elastic component connected with the movable shield is arranged in the shield.

Further, the elastic component is a tension spring.

Furthermore, the abutting surface comprises a first abutting surface and a second abutting surface, and the saw blade is arranged between the first abutting surface and the second abutting surface.

Furthermore, the bottom plate is provided with a hollow part, the hollow part is arranged on one side of the bottom plate close to the saw blade, the cutting blade part is arranged in the hollow part, and the cutting blade protrudes out of the lower part of the bottom plate.

Further, the electric circular saw may further include one or both of a cutting blade or a grinding blade.

Furthermore, the shell is rotatably connected with the bottom plate through a rotating shaft, and the axis of the rotating shaft is parallel to the axis direction of the output shaft.

Further, still be equipped with the adjusting device who is used for adjusting saw bit depth of cut on the casing, adjusting device includes adjusting knob and degree of depth regulating plate, and casing and bottom plate are connected to the degree of depth regulating plate, are equipped with the draw-in groove that supplies the adjusting knob to remove on the degree of depth regulating plate, and the adjusting knob passes the draw-in groove and is connected with the casing.

Compared with the prior art, the invention has the beneficial effects that: the electric circular saw can be provided with one of the cutting blade and the grinding blade, the saw blade is also provided with the protective cover for protection, positioning, auxiliary dust absorption and separation, the outer end surface of the protective cover is coplanar with the grinding surface of the grinding blade, and the abutting surface of the upper bottom plate of the shell is coplanar with the side surface of the cutting blade, so that the electric circular saw can realize the edge-aligning cutting of the cutting blade and the edge-aligning grinding of the grinding blade, the working efficiency is improved, and the use time and the cost are saved.

In addition, the electric circular saw is provided with the inner protective cover and the outer protective cover, so that the cutting blade is protected and assisted in dust collection, and the grinding blade is protected and positioned, and the electric circular saw has the characteristics of convenience in operation, long service life, accuracy in cutting and easiness in cleaning.

In addition, the electric circular saw provided by the invention is provided with the movable shield to ensure that the cutting blade is not exposed in a free state, so that the injury to a human body is avoided, and the safety is higher.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

Fig. 1 is a schematic structural view of an electric circular saw with grinding blades mounted thereon according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic view of the electric circular saw shown in FIG. 1 from another perspective;

FIG. 4 is a schematic view illustrating a structure of an electric circular saw with cutting blades mounted thereon according to an embodiment of the present invention;

FIG. 5 is a schematic view of the electric circular saw shown in FIG. 4 from another perspective;

FIG. 6 is a partial schematic structural view of an electric circular saw according to an embodiment of the present invention;

FIG. 7 is a sectional view showing a partial structure of a guard in the electric circular saw according to the embodiment of the present invention;

fig. 8 and 9 are partial schematic structural views of an adjusting device in an electric circular saw according to an embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

It should be noted that: the terms "upper", "lower", "left", "right", "inner" and "outer" of the present invention are used for describing the present invention with reference to the drawings, and are not intended to be limiting terms. The coplanarity of the present invention is not limited to coplanarity in an absolute sense, and it can be understood by those skilled in the art that the coplanarity is between the outer side surface and the abutting surface due to the clearance and tolerance existing in the mutual combination of the mechanical structures; the grinding surface and the outer end surface are spaced apart from each other by a distance that is not perfectly coplanar, or a gap is reserved between the grinding surface and the outer end surface to avoid damage to the guide device or the workpiece, and preferably, the distance is not more than 3mm, and the distance is within the coplanar range of the invention.

Referring to fig. 1 to 9, an electric circular saw according to an embodiment of the present invention includes a main machine and a saw blade, the main machine includes a housing 1 and a bottom plate 11 connected to the housing 1, a motor (not shown), a transmission mechanism (not shown) and an output shaft (not numbered) are disposed in the housing 1, the transmission mechanism is connected to the motor and the output shaft, wherein the motor is connected to the transmission mechanism through the motor output shaft (not shown), the motor output shaft is perpendicular to an axial direction of the output shaft, the output shaft is used for mounting the saw blade, the electric circular saw further includes a guard 2 disposed on the housing 1, the output shaft protrudes out of the housing 1 and extends into the guard 2, and at least a portion of the output shaft is accommodated in the guard. The base plate 11 includes a contact surface 111 for contacting a guide (not shown), typically a guide plate, but may be other devices or structures capable of guiding in actual use. In the invention, the shield 2 has an outer end surface 211a arranged back to the shell 1, the saw blade comprises a cutting blade 3 and a grinding blade 4 which are selectively arranged on an output shaft, and when the cutting blade 3 is arranged on the output shaft, the abutting surface 111 is coplanar with an outer side surface 32 of the cutting blade 3 back to the shell 1; when the grinding plate 4 is mounted on the output shaft, the outer end face 211a of the hood 2 is coplanar with the grinding face 41 of the grinding plate 4 facing away from the housing 1.

In the present embodiment, a first mounting space (a space portion where the grinding chip 4 is mounted) for mounting the grinding chip 4 and a second mounting space (a space portion where the cutting chip 3 is mounted) for mounting the cutting chip 3 are defined in the housing 2. A first plane is defined in the first mounting space, and the first plane is the position of the grinding surface 4 back to the shell 1 in the grinding sheet 4 after the grinding sheet 4 is mounted; a second plane is defined in the second mounting space, and the second plane is the position of the outer side surface 32 of the cutting blade 3 after the cutting blade 3 is mounted; the outer end surface 211a is located in an extension of the first plane and the abutment surface 111 is located in an extension of the second plane.

With the electric circular saw shown in fig. 3 as a reference object, the lateral direction is defined as the width direction of the electric circular saw (the direction indicated by the arrow a in fig. 3), that is, the axial direction 100 of the output shaft, and the side surface close to the housing 1 when the saw blade is attached to the output shaft is defined as the attachment surface 31 in the axial direction 100 of the output shaft. In the present embodiment, the cutting blade includes a mounting surface 31a and an outer side surface 32 defined and formed when the cutting blade 3 is mounted on the output shaft, the mounting surface 31a and the outer side surface 32 are disposed opposite to each other, and the grinding blade includes a mounting surface 31b and a grinding surface 41. In the axial direction 100 of the output shaft, the outer side surface 32 and the grinding surface 41 are respectively away from the housing 1 with respect to the mounting surface 31a and the mounting surface 31b, the outer side surface 32 is coplanar with the abutting surface 111, and the grinding surface 41 is coplanar with the outer end surface 211 a.

In the present embodiment, the shield 2 includes a stationary shield 21 and a movable shield 22 provided inside the stationary shield 21. The stationary shroud 21 includes an inner shroud 212 and an outer shroud 213, and since the grinding surface 41 of the grinding blade 4 is disposed away from the housing 1 with respect to the outer side surface 32 of the cutting blade 3, the inner shroud 212 is disposed closer to the housing 1 with respect to the outer shroud 213 in the axial direction 100 of the output shaft (the direction indicated by the arrow a in fig. 3), that is, the outer shroud 213 is disposed at an outer portion away from the housing 1 with respect to the inner shroud 212. The surface of the outer shield 213 contacting the cut object is an outer end surface 211a, and the outer end surface 211a is coplanar with the grinding surface 41 of the grinding sheet 4, so that the grinding sheet can realize edge grinding during operation. The inner shield 212 and the outer shield 213 are both arc-shaped structures, arc-shaped cavities are formed, and the cutting blade 3 and the grinding blade 4 are respectively and partially accommodated in the arc-shaped cavities of the inner shield 212 and the outer shield 213, so as to be used for protecting and positioning the saw blade. Meanwhile, because the cutting blade 3 often produces a large amount of debris during operation, the arc-shaped cavity can also play a role in assisting dust collection of the cutting blade 3.

In this embodiment, the cutting blade 3 is partially received in the movable shield 22, and the movable shield 22 is rotatable about the axis of the output shaft to shield and expose a portion of the cutting blade 3. The shield 2 is further provided with a resilient member 215 connected to the movable shield 22, and in this embodiment, the resilient member 215 is a tension spring, but in other embodiments, it may be another resilient structure. Taking fig. 4 as an example, when the electric circular saw is in a non-working state, the movable guard 22 rotates clockwise around the output shaft as an axis until the tension spring is in a balanced state (i.e. the tension spring is in an initial state), and at this time, the movable guard 22 shields the cutting blade 3 to prevent it from being exposed; when the electric circular saw is in a working state, the movable guard 22 jacks up the cut object in a direction opposite to the cutting depth along with the increase of the cutting depth of the cutting blade 3, the movable guard 22 rotates counterclockwise by taking the output shaft as an axis, and the tension spring is stretched. The shield 2 is further provided with a toggle button 23 for applying external force to drive the movable shield 22 to rotate around the axis of the output shaft, an arc-shaped notch 214 is formed between the inner shield 212 and the outer shield 213, and the toggle button 23 is disposed through the arc-shaped notch 214 and located outside the arc-shaped notch 214 to facilitate the operation thereof to rotate the movable shield. In this embodiment, the radius of the inner shield 212 is larger than that of the outer shield 213, the outer shield 213 includes an outer end surface 211a and an outer shield peripheral surface 211b connected to the outer end surface 211a, wherein the outer shield peripheral surface 211b and the outer end surface 211a form an included angle of 90 degrees, and the toggle button 23 can slide along the outer shield peripheral surface 211 b. Through the design of the movable protective cover, the saw blade can not be exposed no matter the electric circular saw is in a working state, so that the injury to a human body is avoided.

In the present embodiment, the bottom plate 11 has two side surfaces perpendicular to the axial direction of the output shaft, wherein the abutting surface 111 is a side surface close to the saw blade. The base plate 11 further has a hollow 112, the hollow 112 is disposed on one side of the base plate 1 near the saw blade, the cutting blade 3 is partially disposed in the hollow 112, and the cutting blade 3 protrudes below the base plate 1. In the embodiment, the abutting surface 111 has a first abutting surface 111a and a second abutting surface 111b, in the front-back direction of the electric circular saw (cutting direction of the electric circular saw, direction indicated by arrow b in fig. 2), the first abutting surface 111a and the second abutting surface 111b are located at two sides of the hollow portion 112, and the saw blade is disposed between the first abutting surface 111a and the second abutting surface 111 b.

Referring to fig. 7, in the present embodiment, the hood 2 further includes a dust suction portion 24 formed on the fixed hood 21, and the dust suction portion 24 is located at a front end portion of the fixed hood 21. When the saw blade is in an operating state, the generated material such as the debris enters the dust suction portion 24 from the dust suction inlet 241 by the rotational force of the saw blade, the dust suction portion 24 is connected to a dust suction device (not shown), and the dust suction portion 24 has a dust suction outlet (not shown) butted against the dust suction device.

In this embodiment, the inner shield 212, the outer shield 213 and the movable shield 22 are all arc-shaped structures, so that they have arc-shaped cavities, thereby playing a role of assisting dust collection, and indeed, in other embodiments, the structural shapes thereof can be selected according to specific practical requirements.

Referring to fig. 8 and 9, in the present embodiment, the housing 1 is rotatably connected to the bottom plate 11 through a rotating shaft 12, and a shaft axis of the rotating shaft 12 is parallel to an axial direction of the output shaft. The housing 1 is further provided with an adjusting device 5 for adjusting the cutting depth of the cutting blade 3, and the adjusting device 5 comprises an adjusting button 51 and a depth adjusting plate 52. In the cutting direction, the rotating shaft 12 is located at the front side of the adjusting device 5, the rotating shaft 12 is located at the front side of the housing, the adjusting plate 52 of the adjusting device 5 is located at the rear of the axial direction of the output shaft, in this embodiment, the rotating shaft is connected with the bottom plate 11 through the fixed protective cover 21, and the fixed protective cover 21 is provided with a rotating shaft mounting hole (not numbered). One end of the depth adjusting plate 52 is fixed on the bottom plate, a clamping groove 521 is formed in the depth adjusting plate 52, the clamping groove is an arc-shaped groove, a scale (not numbered) is formed in the depth adjusting plate 52, the scale is located on one side of the clamping groove 521 and arranged along the radian of the clamping groove 521, the adjusting button 51 is provided with a rod body portion 511 installed on the shell 1 and a toggle portion 512 arranged on the rod body portion 511, the toggle portion 512 is sleeved on the rod body portion 511, and the toggle portion 512 can rotate relative to the rod body portion 511. The lever portion 511 passes through the engaging groove 521 to be connected to the knob portion 512, and the depth adjustment plate 52 is movable relative to the lever portion 511 in the opening direction of the engaging groove 521. When the electric circular saw needs to carry out depth adjustment, firstly, the dial-knob part 512 is rotated (the dial-knob part 512 is rotated anticlockwise), so that the depth adjusting plate 52 and the dial-knob part 512 are loosened (unlocked), the shell 1 can rotate around the rotating shaft 12 relative to the base plate 11, when the shell rotates to the corresponding depth scale position on the depth adjusting plate 52, the dial-knob part 512 is reversely locked (the dial-knob part 512 is rotated clockwise), and the dial-knob part 512 is clamped and fixed on the depth adjusting plate (locked), so that the depth adjustment is completed. When the electric circular saw is used for cutting, the movable shield 22 moves upwards under the action of the cut object to expose the saw blade, and the electric circular saw is held by a user to move forwards to cut according to the cutting depth. In this embodiment, the electric circular saw can also realize accurate cutting by installing the guide rule 6, wherein the bottom plate 11 is provided with an opening 113 for the guide rule 6 to pass through, and the guide rule 6 is installed or removed through the guide rule locking button 7.

When the electric circular saw provided by the invention is provided with the cutting blade 3, when the electric circular saw is not in a working state, the movable protective cover 22 slides downwards along the circumference of the cutting blade 3 to a state that the tension spring is in a balance state due to the action of the tension spring, so that the electric circular saw is ensured not to be exposed in a free state, and the damage to a human body is avoided. When the cutting blade 3 is in the working state, the cut object jacks up the movable shield 22 and the tension spring is stretched along with the increase of the cutting depth of the cutting blade 3. When the cutting blade 3 performs cutting operation, the bottom surface of the bottom plate 11 contacts with an object to be cut, the abutting surface 111 contacts with a guide plate or other guide devices, and the electric circular saw cuts the object to be cut along the guide plate due to the coplanarity of the outer side surface 32 of the cutting blade 3 and the abutting surface 111 of the bottom plate 11, so that the edge trimming cutting of the cutting blade 3 is realized. Furthermore, the chips generated during the cutting process are collected by the arc-shaped chamber of the inner shield 212 and the dust suction part 24 under the rotational force of the saw blade, and at the same time, the inner shield 212 also plays a role of protecting the saw blade.

When the electric circular saw of the present invention is installed with the grinding blade 4, when the electric circular saw is in the working state, since the outer end surface 211a of the outer guard 213 is coplanar with the grinding surface 41 of the grinding blade 4, the outer end surface 211a can be used for positioning grinding, so as to achieve the purpose of edge-flush grinding. Meanwhile, the outer shield 213 also functions to shield the saw blade.

In this embodiment, the main body and the saw blade are present together, but in practical cases, the main body and the saw blade of the electric circular saw can be separated, and do not need to be present together, and the protection of the main body of the electric circular saw of the present invention is not affected by the installation or non-installation of the saw blade.

In summary, the following steps: the electric circular saw can be provided with one of the cutting blade and the grinding blade, the saw blade is also provided with the protective cover for protection, positioning, auxiliary dust absorption and separation, the outer end surface of the protective cover is coplanar with the grinding surface of the grinding blade, and the abutting surface of the upper bottom plate of the shell is coplanar with the side surface of the cutting blade, so that the edge-aligning cutting of the cutting blade can be realized, the edge-aligning grinding of the grinding blade can also be realized, the working efficiency is improved, and the using time and the cost are saved. In addition, the electric circular saw is provided with the inner protective cover and the outer protective cover, so that the cutting blade is protected and assisted in dust collection, and the grinding blade is protected and positioned, and the electric circular saw has the characteristics of convenience in operation, long service life, accuracy in cutting and easiness in cleaning. In addition, the electric circular saw provided by the invention is provided with the movable shield to ensure that the cutting blade is not exposed in a free state, so that the injury to a human body is avoided, and the safety is higher.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An electric circular saw comprises a shell and a bottom plate connected with the shell, wherein a motor, a transmission mechanism and an output shaft are arranged in the shell, the transmission mechanism is connected with the motor and the output shaft, and the output shaft is used for mounting a saw blade; the electric circular saw also comprises a shield arranged on the shell, the output shaft protrudes out of the shell and extends into the shield, and at least part of the saw blade is contained in the shield; the method is characterized in that: the bottom plate comprises an abutting surface for contacting with the guide device, and the shield is provided with an outer end surface back to the shell; the saw blade comprises a grinding sheet and a cutting sheet which are selectively arranged on the output shaft, when the grinding sheet is arranged on the output shaft, the outer end surface of the protective cover is coplanar with the grinding surface of the grinding sheet, which faces away from the shell; when the cutting blade is installed on the output shaft, the abutting surface and the outer side surface of the cutting blade, which faces away from the shell, are coplanar.

2. The electric circular saw of claim 1, wherein the guard includes a stationary guard and a movable guard disposed within the stationary guard, the movable guard being rotatable about an axis of the output shaft to shield and uncover a portion of the cutting blade.

3. The electric circular saw of claim 2, wherein the movable guard has a knob for applying an external force to drive the movable guard to rotate around the axis of the output shaft, the fixed guard has an arc-shaped notch, and the knob is disposed through the arc-shaped notch.

4. The electric circular saw of claim 3, wherein the arcuate notch divides the stationary shroud into an inner shroud and an outer shroud; in the axial direction of the output shaft, the inner protective cover is arranged close to the shell relative to the outer protective cover, the inner protective cover is used for containing the cutting blade, and the outer protective cover is used for containing the grinding blade.

5. The electric circular saw of claim 4, wherein the outer shroud includes the outer end surface and an outer shroud peripheral surface connected to the outer end surface, wherein the outer shroud peripheral surface forms a 90 degree angle with the outer end surface.

6. The electric circular saw of claim 5, wherein the dial knob is slidable along a circumference of the outer guard.

7. The electric circular saw of claim 4, wherein a radius of the inner shroud is greater than a radius of the outer shroud.

8. The electric circular saw of claim 2 or 3, wherein a first mounting space for mounting a grinding chip and a second mounting space for mounting the cutting chip are defined in the shroud; a first plane is defined in the first mounting space, and the first plane is the position of a grinding surface, back to the shell, in the grinding sheet after the grinding sheet is mounted; a second plane is defined in the second mounting space, and the second plane is the position of the outer side surface of the cutting blade after the cutting blade is mounted; the outer end face is located in the extension face of the first plane, and the abutting face is located in the extension face of the second plane.

9. The electric circular saw of claim 8, wherein the stationary shield includes an inner shield defining the first mounting space and an outer shield defining the second mounting space, the inner shield being disposed adjacent to the housing with respect to the outer shield in an axial direction of the output shaft.

10. The electric circular saw of claim 1, wherein the retaining surface includes a first retaining surface and a second retaining surface, the saw blade being disposed between the first retaining surface and the second retaining surface.