WO2016127451A1

WO2016127451A1 - Handheld dual-purpose circular saw

Info

Publication number: WO2016127451A1
Application number: PCT/CN2015/073482
Authority: WO
Inventors: 陈诗歌; 宋希万; 郭路华
Original assignee: 杭州鲁茨科技有限公司
Priority date: 2015-02-15
Filing date: 2015-03-02
Publication date: 2016-08-18

Abstract

A handheld dual-purpose circular saw, comprising a motor assembly (1), a cutting blade (7), a fixed protective cover (2), a main handle assembly (5), and a branch comb (4) and movable protective cover (3) arranged coaxially to the cutting blade (7); the handheld dual-purpose circular saw is able to switch between a pruning state and a sawing state, conveniently implementing sawing and pruning without increasing the financial burden or storage space needed.

Description

Hand-held dual-purpose circular saw

Technical field

The present invention relates to a circular saw, and in particular to a hand-held circular saw having both functions.

Background technique

Hand-held circular saws for single sawing and hand-held disc pruning shears for single trimming are now widely used. However, in actual work, there are often two requirements for sawing and pruning. If only one of the above tools is used, sometimes the work is not convenient or even impossible. If the above two tools are all equipped, the economic burden and storage space are increased, especially the carrying is inconvenient.

Summary of the invention

In order to solve the above problems, the present invention provides a hand-held dual-purpose circular saw including a motor assembly, a cutting blade, a fixed shield fixedly coupled to the motor assembly, and the sleeve being a main handle assembly on a motor casing of the motor assembly, a combing plate and a movable shield on a cylinder coaxial with the cutting blade shaft on the motor assembly, wherein the hand-held dual-purpose disc The saw can be switched between the trim state and the saw state.

According to a preferred form of the invention, in the hand-held dual-purpose circular saw, the main handle assembly is rotatable about the motor casing.

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, the combing plate and the movable shield can be rotated together about their mounting axis and the movable shield can also be When the comb board is fixed, the rotation is independently performed, and the operation mode switching is completed by respectively rotating the main handle assembly and the comb board.

In accordance with a preferred form of the invention, the hand-held dual-use circular saw further includes a mode-synchronous conversion mechanism that associates the main handle assembly with the carding plate.

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, when the hand-held dual-purpose circular saw is switched from a trimmed state to a sawing state, the cutting blade is made of a blade having less than 6 blades. Turned into a circular saw blade of 20 teeth or more, and when the hand-held dual-purpose circular saw is turned from the sawing state When the state is changed to the trim state, the cutting blade is changed from a circular saw blade of 20 teeth or more to a blade of less than 6 blades.

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, the movable protective cover and the combing plate are pulled together by a movable protective cover return spring to form a larger than Or equal to 360° occlusion area.

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, the rotation range of the main handle assembly reciprocally about the motor casing is 90°, and the main handle assembly is in its rotation range. The two extreme positions are clamped in the locked position with the clamping knob.

According to a preferred form of the invention, in the hand-held dual-purpose circular saw, the combing plate rotates around the cylinder coaxial with the cutting blade shaft on the motor assembly to a range of 180°.

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, the combing plate has a screw hole post and a fixing knob, and the fixed end of the fixing shield is symmetrically opened in a diameter direction. Two notch grooves, the inside of the notch groove allowing the shaft of the fixing knob of the carding plate to enter, the groove of the notch groove being clamped and positioned along the fixing knob for the carding plate .

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, at the two extreme positions of the rotation of the carding plate, the shaft of the fixing knob enters the fixed shield. In the notch groove, after the notch groove is inserted, the fixing knob is screwed, and the upper end surface of the screw hole post and the lower end surface of the fixing knob sandwich the groove of the notch groove, thereby Lock the position of the carding board.

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, the mode synchronous conversion mechanism is composed of one driving gear, one or two intermediate gears, one driven gear and one guiding wheel. composition.

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, the driving gear is an internal gear, and the inner ring of the driving gear is provided with a guiding groove for guiding and guiding the guiding wheel, the driving gear The outer end surface is provided with a mounting interface fixedly coupled to the main handle assembly, the intermediate gear and the driven gear are external gears, the driven gear is concentric with the cutting blade shaft, and The comb board is fixedly connected.

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, the gear ratio of the gear set of the mode synchronous conversion mechanism is 1:2, to satisfy the rotation of the main handle assembly by 90°. The combing board is followed by a working requirement and operating requirement of 180° rotation.

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, the main handle assembly has a left half handle and a right half handle, one end of which is combined with a cylinder with an open slit, the cylinder being rotatable The ground cover is assembled on the motor casing.

According to a preferred form of the present invention, in the hand-held dual-purpose circular saw, there is a pre-tightening adjustment screw at the upper end and the lower end of the opening slit, and a clamping knob in the middle, in the pre-tightening adjustment screw Under the action of the main handle assembly, the main handle assembly rotates smoothly around the motor casing, and when the two extreme points are turned, the opening slit is compressed by the clamping knob until the main handle assembly is clamped in the Said on the motor casing.

By means of the hand-held dual-purpose circular saw provided by the invention, when both the sawing and the trimming work requirements are met in the actual work, the sawing and trimming can be conveniently carried out without the above-mentioned one tool. Will increase the economic burden and storage space.

DRAWINGS

Hereinafter, various embodiments of the present invention will be described in conjunction with the following drawings, in which:

1A is a schematic view showing the operation of the hand-held dual-purpose circular saw of the present invention in a trimming working state;

1B is a schematic view showing the operation of the hand-held dual-purpose circular saw of the present invention in a sawing working state;

2 is a schematic structural view of a fixed protective cover of the hand-held dual-purpose circular saw of the present invention;

3 is a schematic view showing the operation of the combing plate and the movable protective cover of the hand-held dual-purpose circular saw of the present invention through the movable protective cover return spring;

Figure 4 is a schematic view showing the structure of the assembled main handle assembly of the hand-held dual-purpose circular saw of the present invention;

Fig. 5 is a schematic view showing the structure of a mode synchronous conversion mechanism of the hand-held dual-purpose circular saw of the present invention.

detailed description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, various embodiments of the hand-held dual-purpose circular saw of the present invention will be specifically described with reference to the accompanying drawings. The hand-held dual-purpose circular saw of the present invention is suitable for cutting workpieces made of materials such as wood, plastic, soft metal, etc., and is also capable of trimming shrubs, flowers, and the like by switching modes of work mode and replacing cutting blades.

Fig. 1A is a schematic view showing the operation of the hand-held dual-purpose circular saw of the present invention in a trimming operation state. Fig. 1B is a schematic view showing the operation of the hand-held dual-purpose circular saw of the present invention in a sawing working state.

Example 1

As shown in FIGS. 1A and 1B, in view of the above, the present invention contemplates a hand-held dual-purpose circular saw that can perform both sawing and trimming operations. A hand-held dual-purpose circular saw according to the present invention mainly comprises a motor assembly 1, a fixed shield 2, a movable shield 3, a carding board (also called a fixed shearing plate) 4, a main handle assembly 5 and a cutting blade 7 composition.

The motor assembly 1 includes an electric motor as a power source of the circular saw.

A cutting blade 7 for cutting a workpiece is mounted on the output shaft of the motor on one side of the motor assembly 1. The cutting blade 7 may be a blade of less than 6 blades or a circular saw blade of 20 teeth or more.

The fixed shield 2 is fixedly coupled to the motor assembly 1. The fixed shield 2 is substantially semi-circular. In order to clearly describe the various directions, the fixed shield 2 can be used as a reference (see below).

The movable shield 3 is also substantially semi-circular. In addition to the function of combing and cutting, the combing board 4 also has a safety protection function. The spacing between the teeth of the carding panel 4 shall be designed in accordance with the relevant safety regulations (for example, the GS standard requires less than 8 mm) in order to meet the requirements for safety protection during the trimming work.

The movable shield 3 is placed on the cylinder of the motor assembly 1 coaxial with the cutting blade shaft together with the combing plate 4, and can be rotated 180° around the cylinder.

2 is a schematic view showing the structure of a fixed protective cover of the hand-held dual-purpose circular saw of the present invention.

As shown in FIG. 2, the left end groove 21 and the right notch groove 22 are symmetrically provided on the open end of the fixed shield 2 in the left-right direction (diameter of the semicircle). One surface of the fixed shield 2 is substantially U-shaped and the other surface is substantially semi-annular. The left notch groove 21 and the right notch groove 22 are provided on a substantially U-shaped surface. The substantially U-shaped surface of the fixed shield 2 is fixedly attached to the housing of the motor assembly 1 (which may also be integral with the housing).

3 is a schematic view showing the operation of the comb plate and the movable shield of the hand-held dual-purpose circular saw of the present invention through the movable guard return spring.

As shown in Fig. 3, the movable shield 3 and the combing plate 4 are pulled together by the movable protective cover return spring 31 in a natural state, and the area enclosed by the two is ≥ 360° (that is, an overlapping area is allowed). A recess is provided in the movable shield 3, and when the movable shield 3 and the combing plate 4 are brought together, the screw post 41 or the fixed knob 42 (described later) on the combing plate 4 can be accommodated in the activity. Inside the recess of the shield 3.

Regardless of which of the movable shield 3 and the combing plate 4 is turned directly in front of the fixed shield 2, the cutting blade can be completely shielded from the cutting blade edge together with the fixed shield 2 to achieve safety specifications. .

In particular, the lower edge (exposed edge) of the movable shield 3 in the sawing state can be formed into a duckbill shape. When the circular saw performs the sawing operation, the cutting blade 7 and the movable shield 3 are abutted against the workpiece, and the reaction force of the workpiece pushes the movable shield 3 to rotate relative to the comb plate 4. The extent to which the movable shield 3 is topped depends on the thickness or thickness of the workpiece to be sawed. If no workpiece abuts against the movable shield 3, the movable shield 3 automatically closes under the action of the elastic force.

That is to say, when the circular saw is turned from the trimming state to the sawing state, the rotation of the combing plate will drive the movable protective cover to rotate together; and when the circular sawing blade is locked and the circular saw saws the workpiece, the movable protective cover can be Independently rotating independently of the comb board under the action of external force.

The combing plate 4 is provided with a threaded hole column 41. The screw hole is provided with a fixing knob 42. When the carding plate is rotated 180° to the left and right end points (90° and -90°), the shaft of the knob 42 is fixed. Just falling into the preset left notch groove 21 or the right notch groove 22 of the fixed shield 2, and then tightening the fixing knob 42, the upper surface of the screw hole post 41 and the lower surface of the fixing knob 42 can be used to recess the notch The groove of the

groove

21 or 22 is clamped to secure the carding plate 4 in place.

4 is a schematic view showing the structure of the assembled main handle assembly of the hand-held dual-purpose circular saw of the present invention.

As shown in FIG. 4, the main handle assembly 5 includes a left half handle 51 and a right half handle 52, one end of which is combined with a cylinder with an open slit which can be fitted over the motor casing; at the upper end of the slit There is a pre-tightening adjustment screw 54 at the lower end and a clamping knob 53 in the middle. Under the action of the pre-tightening adjustment screw 54, the main handle assembly 5 can smoothly rotate around the motor casing. According to the design requirements, the range of rotation of the main handle assembly 5 is limited to 0 ° ~ 90 °, when turning to two end points (0 ° and 90 °), the clamping knob 53 can be tightened to compress the opening gap to the main handle The assembly 5 is clamped to the motor housing.

Incidentally, a cable jacket can be made inside the main handle assembly 5 to accommodate a power cable that supplies power to the motor assembly.

The hand-held dual-purpose circular saw of the present invention may further include a sub-handle 8 as shown in FIG. 1B, and the sub-handle 8 may be disposed along a radial direction (also referred to as a vertical radius direction) of the fixed shield 2 perpendicular to the diameter direction. On the motor housing or on the bracket that is connected to the motor housing. When using a dual-purpose circular saw to saw a workpiece, the operator can hold the main handle assembly 5 with one hand while holding the sub-handle 8 with the other hand. In this case, the stability of the circular saw during operation can be improved.

Next, the operation and operation mode switching of the hand-held dual-purpose circular saw of the present embodiment will be described with reference to Figs. 1A and 1B.

Trimming operation state (Fig. 1A): (This state is set to the initial state, in the following description, the opening direction of the fixed shield 2 is defined as the front, and the operator's visual base point is located at the rear upper portion of the fixed shield 2)

This working state corresponds to a thinner workpiece. The workpiece referred to herein may refer to branches or flowers of wood such as branches and shrubs.

In this working state, the cutting blade is a blade with less than 6 blades; the main handle assembly 5 is located directly above and behind the fixed shield 2, the movable shield 3 is located inside the fixed shield 2, and the combing plate 4 is located in the fixed shield 2 Directly ahead. The combing plate 4 and the fixed shield 2 together complete the safety protection of the blade. At this time, the clamp knob 53 clamps the main handle assembly 5 in the vertical radial direction of the fixed shield 2. The fixing knob 42 of the carding plate 4 fixes the carding plate 4 in the left notch groove 21 of the fixed shield 2. At this time, as long as the motor is started, the comb board 4 and the high-speed rotating blade can trim the branches or flowers like a hair clipper.

Sawing work status (Figure 1B):

This working state corresponds to a thicker workpiece. If you want to saw a thicker branch, we can replace a blade with less than 6 blades with a dozens of circular saw blades and convert the dual-purpose circular saw into a sawing mode:

1) respectively loosen the clamping knob 53 of the main handle assembly 5 and the fixing knob 42 of the carding plate 4;

2) rotating the main handle assembly 5 clockwise by 90°, causing the combing plate 4 to rotate 180° clockwise, and the movable protective cover 3 will rotate 180° with the combing plate 4 due to the action of the return spring 31, thereby combing the board 4 is hidden inside the fixed protective cover 2, and the movable protective cover 3 is located directly in front of the fixed protective cover 2; the movable protective cover 3 and the fixed protective cover 2 together complete the safety protection of the circular saw blade.

3) tightening the clamping knob 53 of the main handle assembly 5 and the fixing knob 42 on the combing plate 4 in the right notch groove 22 to lock the above position;

4) Install the sub-handle 8. At this point, as long as the motor is started, the high-speed rotating circular saw blade can be sawed like a normal hand-held circular saw.

Restore the trimming status:

1) Replace the circular saw blade with a blade with less than 6 blades.

2) respectively loosen the clamping knob 53 of the main handle assembly 5 and the fixing knob 42 of the carding plate 4;

3) rotating the main handle assembly 5 by 90° counterclockwise, causing the combing plate 4 to rotate 180° counterclockwise; due to the action of the return spring 31, the movable protective cover 3 will rotate 180° with the combing plate 4, thereby moving the protective cover 3 is hidden inside the fixed protective cover, and the combing plate 4 is located directly in front of the fixed protective cover 2.

4) The clamping knob 53 of the main handle assembly 5 and the fixing knob 42 of the carding plate 4 are tightened to lock the above position, thus completing the restoration trimming operation state. At this time, as long as the motor is started, the comb board 4 and the high-speed rotating blade can trim the branches like a hair clipper.

In this embodiment, the mode conversion process is completed by rotating the carding plate and the main handle assembly separately, so that both the trimming and the sawing work can be completed. However, since the combing plate and the main handle assembly cannot form a synchronous linkage when the working mode is switched, the operation steps are increased, making the mode switching process cumbersome.

Example 2

The hand-held dual-purpose circular saw in Embodiment 2 of the present invention is different from the hand-held dual-purpose circular saw in Embodiment 1 in that a mode-synchronous conversion mechanism 6 can also be included.

As shown in Fig. 5, the mode synchronizing conversion mechanism 6 is composed of a driving gear 61, one or two intermediate gears 62, a driven gear 63 and a guide wheel 64.

The driving gear 61 of the mode synchronous conversion mechanism 6 is an internal gear. The inner ring of the driving gear 61 is provided with a guiding groove 611 for guiding and guiding the guiding wheel. The outer end surface of the driving gear 61 is fixedly connected with the main handle assembly 5. The mounting interface 612; the intermediate gear 62 and the driven gear 63 are external gears, and the driven gear 63 is concentric with the combing plate 4 and fixedly coupled together. The guide wheel 64 is a rolling bearing for easy rolling in the guide groove.

This mode synchronous switching mechanism can reduce the mode switching step by rotating the main handle assembly to drive the movable shield and the card to rotate together. In the mode synchronous conversion mechanism, the gear ratio of the gear set is designed to be 1:2, which ensures that the movable handle 3 and the combing plate 4 are rotated by 180° after the main handle is rotated by 90° to reach the position required for the work and the main handle Easy to operate.

Trimming working state (Fig. 1A): (This state is set to the initial state. In the following description, the opening direction of the fixed shield is defined as the front, and the operator's visual base point is located at the rear upper part of the fixed guard)

In this working state, the cutting blade is a blade with less than 6 blades; the main handle assembly 5 is located directly above and behind the fixed shield 2, the movable shield 3 is located inside the fixed shield 2, and the combing plate 4 is located in the fixed shield 2 Directly ahead. The combing plate 4 and the fixed shield 2 together complete the safety protection of the blade. At this time, the clamp knob 53 clamps the main handle assembly 5 in the vertical radial direction of the fixed shield 2. The fixing knob 42 of the carding plate 4 fixes the carding plate 4 in the left notch groove 21 of the fixed shield 2. At this time, as long as the motor is started, the combing plate 4 and the blade 7 which is rotated at a high speed can trim the branches like a hair clipper.

Sawing work status (Figure 1B):

Under this working condition, we can replace the blade with less than 6 blades into a circular saw blade with dozens of teeth and convert the dual-purpose circular saw into sawing mode:

2) Rotate the main handle 90° clockwise. At this time, due to the action of the mode synchronous conversion mechanism 6 and the return spring 31, the movable shield 3 and the combing plate 4 will be rotated clockwise by 180° to make the combing plate 4 Inside the fixed shield, the movable shield 3 is located directly in front of the fixed shield; the movable shield 3 and the fixed shield 2 together complete the safety protection of the circular saw blade.

3) tightening the clamping knob 53 of the main handle assembly 5 and the fixing knob 42 of the carding plate 4 in the right notch groove 22 to lock the above position;

Restore the trimming status:

1) Change the dozens of circular saw blades back to less than 6 blades.

3) The main handle assembly 5 is rotated 90° counterclockwise. At this time, due to the action of the mode synchronizing conversion mechanism 6 and the return spring 31, the movable protective cover 3 and the combing plate 4 are rotated counterclockwise by 180°, thereby preventing the movement. The cover 3 is hidden inside the fixed shield 2, and the comb plate 4 is located directly in front of the fixed shield 2.

4) Tighten the clamping knob 53 of the main handle assembly 5 and the fixing knob 42 of the carding plate 4 to lock the above position; thus completing the restoration trimming state; at this time, as long as the motor is started, the carding plate 4 and the high speed rotation The blade can trim the branches like a hair clipper.

In the present embodiment, since the mode synchronizing conversion mechanism is installed in the hand-held dual-purpose circular saw, the mode synchronizing conversion mechanism generates a linkage effect during the operation mode switching. Thus, the mode switching process can be completed without separately rotating the comb plate and the main handle assembly, so that both the trimming and the sawing work can be performed more efficiently.

Variant

The present invention is not limited to the above embodiments, and various modifications may be made without departing from the spirit and scope of the invention.

In the case where the hand-held dual-purpose circular saw has no mode-synchronous conversion mechanism 6, there is no restriction on the order in which the main handle assembly 5 is rotated relative to the motor casing and the carding plate 4 is rotated relative to the fixed shield 2, the operator You can choose according to your own operating habits. In the case where the hand-held dual-purpose circular saw has the mode-synchronous conversion mechanism 6, the main handle assembly 5 should be rotated relative to the motor casing while rotating the carding plate 4 relative to the fixed shield 2.

Although the trim state is taken as the initial state of the circular saw in the above, the sawing state can also be used as the initial state of the circular saw, and the circular saw can be freely converted between the two states.

Although it has been described above that the movable cowl 3 and the carding plate 4 are pulled together by the return spring 31, the present invention is not limited thereto. Any structure may be employed as long as the structure can rotate the movable cowl 3 together with the carding plate 4 and the shield 3 can be independently rotated with the carding plate 4 fixed. For example, a multi-position latch structure can be used between the movable shield 3 and the combing plate 4.

Although the mode synchronous conversion mechanism is described above as using gear transmission, the present invention is not limited thereto. herein. For example, a belt drive or the like can also be used as the transmission between the carding plate and the main handle assembly.

According to the safety regulations, the circular saw can only be activated when the main handle assembly 5 and the combing plate 4 each reach their extreme position. Thus, a microswitch can be provided at the extreme positions of the main handle assembly 5 and the combing plate 4 described above to prevent the machine from being activated without the main handle assembly or the combing plate being in place.

The sub-handle 8 in each embodiment of the present application can be mounted on the motor casing or the bracket when the circular saw is trimmed, or can be mounted on the motor casing or bracket when the circular saw is converted into the sawing mode. on.

In the above, various embodiments of the invention have been described in connection with specific embodiments. However, it should be understood that the various embodiments of the invention are not intended to be limiting. Various modifications and changes of the present invention will be apparent to those skilled in the <RTIgt; These modifications and variations are also intended to be included within the scope of the invention.

Claims

A hand-held dual-purpose circular saw includes a motor assembly, a cutting blade, a fixed shield fixedly coupled to the motor assembly, a main handle assembly sleeved on a motor casing of the motor assembly, and a socket a combing plate and a movable shield on the cylinder of the motor assembly coaxial with the cutting blade shaft,

Wherein, the hand-held dual-purpose circular saw can convert between the trimming state and the sawing state.
A hand-held dual-purpose circular saw according to claim 1, wherein

The main handle assembly is rotatable about the motor housing.
A hand-held dual-purpose circular saw according to claim 1, wherein

The combing plate and the movable shield can rotate together around the mounting axis thereof, and the movable shield can also independently rotate when the combing plate is fixed, by respectively rotating the main handle assembly And the comb board to complete the work mode conversion.
A hand-held dual-purpose circular saw according to claim 2 or 3, further comprising a mode-synchronous conversion mechanism that associates the main handle assembly with the carding plate.
A hand-held dual-purpose circular saw according to claim 2 or 3, wherein

When the hand-held dual-purpose circular saw is switched from the trimming state to the sawing state, the cutting blade is changed from a blade of less than 6 blades to a circular saw blade of 20 teeth or more, and when the hand-held dual-purpose circle When the disk saw is switched from the sawing state to the trimming state, the cutting blade is changed from a circular saw blade of 20 teeth or more to a blade of less than 6 blades.
A hand-held dual-purpose circular saw according to claim 2 or 3, wherein

The movable protective cover and the combing plate are pulled by a movable protective cover return spring Together, together form a occlusion area greater than or equal to 360°.
A hand-held dual-purpose circular saw according to claim 2 or 3, wherein

The main handle assembly rotates reciprocally about the motor housing to a range of 90°, and the main handle assembly is clamped in the locked position by a clamping knob at two extreme positions of its range of rotation.
A hand-held dual-purpose circular saw according to claim 2 or 3, wherein

The combing plate rotates around the cylinder coaxial with the cutting blade shaft on the motor assembly to rotate 180°.
A hand-held dual-purpose circular saw according to claim 2 or 3, wherein

The combing plate has a screw hole post and a fixing knob, and the opening end of the fixing shield is symmetrically opened in the diameter direction with two notch grooves, and the notch groove allows the carding plate The shaft of the fixing knob enters, and the groove of the notch groove is clamped and positioned along the fixing knob for the carding board.
A hand-held dual-purpose circular saw according to claim 8, wherein

At the two extreme positions of the rotation of the carding plate, the shaft of the fixing knob enters the notch groove of the fixed protective cover, and after entering the notch groove, the fixing knob is tightened. The upper end surface of the screw hole post and the lower end surface of the fixing knob sandwich the groove of the notch groove to lock the position of the carding plate.
A hand-held dual-purpose circular saw according to claim 4, wherein

The mode synchronous conversion mechanism is composed of one driving gear, one or two intermediate gears, one driven gear and one guiding wheel.
A hand-held dual-purpose circular saw according to claim 11, wherein

The driving gear is an internal gear, and the inner ring of the driving gear is provided with a guiding groove for guiding Positioning to the wheel, the outer end surface of the driving gear is provided with a mounting interface fixedly coupled with the main handle assembly, the intermediate gear and the driven gear are external gears, the driven gear and the cutting blade The shaft is concentric and is fixedly coupled to the comb plate.
A hand-held dual-purpose circular saw according to claim 11 or 12, wherein

The gear ratio of the gear set of the mode synchronous conversion mechanism is 1:2, to meet the working requirements and operational requirements of the main handle assembly rotating 90° and the combing plate following the rotation 180°.
A hand-held dual-purpose circular saw according to claim 2, wherein

The main handle assembly has a left half handle and a right half handle, one end of which incorporates a cylinder with an open slit, the cylinder being rotatably fitted over the motor housing.
A hand-held dual-purpose circular saw according to claim 14, wherein

a pre-tightening adjusting screw is arranged at an upper end and a lower end of the opening slit, and a clamping knob is arranged in the middle, and the main handle assembly rotates smoothly around the motor casing under the action of the pre-tightening adjusting screw. When the two extreme points are turned, the opening is compressed with the clamping knob until the main handle assembly is clamped to the motor housing.