阅读说明：本技术 切割工具 (Cutting tool ) 是由 马一纯 陈锋 王勇 于 2019-06-11 设计创作，主要内容包括：本发明提供一种切割工具,包括壳体；马达,收容于壳体,用于驱动锯片旋转,所述锯片具有锯片平面；底板,与所述壳体连接,所述底板包括具有第一底面的第一底板、具有第二底面的第二底板,所述第二底板设置有与锯片平面共面的抵靠面；第一底板与第二底板通过凸轮连接机构活动连接,凸轮连接机构包括抵接第二底板的凸轮部,凸轮部可转动地连接于第一底板上；凸轮部转动,驱动第二底板相对第一底板运动,使抵靠面露出。与现有技术相比,本发明提供的切割工具,通过凸轮部抵接第二底板促使第二底板相对于第一底板运动；并且设置了锁紧机构,使得在第二底板运动至第二位置时,在需要抵靠面与引导装置配合实现切割工作时,维持抵靠面与锯片平面共面。(the invention provides a cutting tool, comprising a shell; the motor is accommodated in the shell and used for driving a saw blade to rotate, and the saw blade is provided with a saw blade plane; the bottom plate is connected with the shell and comprises a first bottom plate with a first bottom surface and a second bottom plate with a second bottom surface, and the second bottom plate is provided with an abutting surface coplanar with the plane of the saw blade; the first bottom plate is movably connected with the second bottom plate through a cam connecting mechanism, the cam connecting mechanism comprises a cam part abutting against the second bottom plate, and the cam part is rotatably connected to the first bottom plate; the cam part rotates to drive the second bottom plate to move relative to the first bottom plate, so that the abutting surface is exposed. Compared with the prior art, the cutting tool provided by the invention has the advantages that the cam part is abutted against the second bottom plate to drive the second bottom plate to move relative to the first bottom plate; and a locking mechanism is arranged, so that when the second bottom plate moves to the second position and the abutting surface is required to be matched with the guide device to realize cutting work, the abutting surface and the plane of the saw blade are maintained to be coplanar.)

1. a cutting tool for cutting in cooperation with a guide, the guide having a guide face, the cutting tool comprising:

A housing;

a motor housed in the housing;

The transmission mechanism is connected with the motor and used for driving a saw blade, and the saw blade is provided with a saw blade plane;

The bottom plate is connected with the shell and comprises a first bottom plate with a first bottom surface and a second bottom plate with a second bottom surface, and an abutting surface coplanar with the plane of the saw blade is arranged on the second bottom plate and is used for being matched with the guide surface;

The method is characterized in that: the first bottom plate is movably connected with the second bottom plate through a cam connecting mechanism;

The cam connecting mechanism comprises a cam part abutted with the second bottom plate, and the cam part is rotatably connected to the first bottom plate; the cam part rotates to drive the second bottom plate to move relative to the first bottom plate, so that the abutting surface is exposed.

2. The cutting tool of claim 1, wherein: the cam connecting mechanism comprises a connecting shaft connected with the first bottom plate; and the second bottom plate is provided with a through hole for the connecting shaft to pass through, and the connecting shaft passes through the through hole and is connected with the cam part.

3. The cutting tool of claim 2, wherein: the connecting shaft is rotatably connected to the first base plate around the axis of the connecting shaft, and the connecting shaft penetrates through the through hole to be fixedly connected with the cam part.

4. The cutting tool of claim 2, wherein: the connecting shaft is fixedly connected with the first bottom plate; the cam connecting mechanism further comprises a connecting sleeve which is in running fit with the connecting shaft, the connecting shaft penetrates through the through hole to be matched with the connecting sleeve, and the cam part is fixedly connected onto the connecting sleeve.

5. The cutting tool of claim 4, wherein: the connecting shaft is designed as a bolt and the connecting sleeve as a nut.

6. The cutting tool of claim 1, wherein: the rotational axis of the cam portion is parallel to the rotational axis of the saw blade.

7. The cutting tool of claim 2, wherein: the cutting tool is further provided with a guide means for guiding the second base plate to move relative to the first base plate in a direction perpendicular to the second bottom surface.

8. The cutting tool of claim 7, wherein: the extending direction of the through hole is configured to be perpendicular to the second bottom surface, and the guide means includes the through hole.

9. The cutting tool of claim 1, wherein: the cam part is fixedly connected with an operation part for the operation of a user.

10. The cutting tool of claim 1, wherein: and a holding device is arranged between the first bottom plate and the second bottom plate and used for holding the first bottom surface of the first bottom plate and the second bottom surface of the second bottom plate to be coplanar.

11. The cutting tool of claim 10, wherein: the holding device comprises a spring, one end of the spring is abutted against the first bottom plate, and the other end of the spring is abutted against the second bottom plate.

12. A cutting tool, the cutting tool comprising:

A housing;

A motor housed in the housing;

the transmission mechanism is connected with the motor and used for driving a saw blade, and the saw blade is provided with a saw blade plane;

The bottom plate comprises a first bottom plate and a second bottom plate which are movably connected, and the shell is connected with the first bottom plate;

The method is characterized in that: the second bottom plate is provided with a butting surface, and the first bottom plate and the second bottom plate move relatively to expose the butting surface; the cutting tool further includes a locking mechanism for maintaining the abutment surface coplanar with the blade plane.

13. The cutting tool of claim 12, wherein: the locking mechanism comprises a bolt and a nut which is in running fit with the bolt; the bolt is fixedly connected with the first base plate, the second base plate is provided with a through hole for the bolt to pass through, and the bolt passes through the through hole to be matched with the nut.

14. The cutting tool of claim 12, wherein: the locking mechanism comprises a bolt and a nut which is in running fit with the bolt; the nut is fixedly connected with the first bottom plate, the second bottom plate is provided with a through hole for the bolt to pass through, and the bolt passes through the through hole to be matched with the nut.

15. The cutting tool of claim 12, wherein: the locking mechanism comprises a locking cam which is abutted against the second bottom plate along the direction perpendicular to the plane of the saw blade, and the locking cam is rotatably connected to the second bottom plate.

16. The cutting tool of claim 15, wherein: the rotational axis of the locking cam is parallel to the blade plane.

17. The cutting tool of claim 12, wherein: the first bottom plate and the second bottom plate translate relatively.

18. The cutting tool of claim 17, wherein: the cutting tool further comprises a cam part abutted with the second bottom plate, and the cam part is rotatably connected to the first bottom plate; the cam part rotates to drive the second bottom plate to translate relative to the first bottom plate.

19. a cutting tool for cutting in cooperation with a guide, the guide having a guide face, the cutting tool comprising:

A housing;

A motor housed in the housing;

The transmission mechanism is connected with the motor and used for driving a saw blade, and the saw blade is provided with a saw blade plane;

A bottom plate including a first bottom plate having a first bottom surface, a second bottom plate having a second bottom surface;

Wherein the housing is connected to the first bottom plate, the second bottom plate is provided with an abutting surface that engages with the guide surface, and the first bottom surface is supported by the guide means when the abutting surface engages with the guide surface,

The method is characterized in that: the cutting tool is further provided with a locking mechanism for maintaining the abutment surface coplanar with the plane of the saw blade when the abutment surface is mated with the guide surface.

Technical Field

The present invention relates to a cutting tool.

background

Cutting tools, such as electric circular saws, are commonly used electric tools for cutting workpieces with a saw blade. When cutting a workpiece, it is common to place the base plate of the cutting tool on the workpiece while the saw blade is aligned with the cutting line marked on the workpiece, and then push the cutting tool on the surface of the workpiece to make a cut. However, in the cutting process, the cutting precision of the operator is often not guaranteed due to human factors, and the working efficiency is also low.

The existing solution is to use a guide device to guide, when cutting, a side edge of the bottom plate of the cutting tool parallel to the saw blade is abutted against the guide surface of the guide device, then the cutting tool is moved to cut and the side edge of the bottom plate of the cutting tool is guaranteed to move along the guide surface all the time, so that the problems of low cutting precision and low working efficiency caused by human factors can be solved. However, this solution also presents the problem that, since the base plate of the cutting tool has a certain width and the saw blade is at a certain distance from the side edges of the base plate, one cannot align the guide surface of the guide means directly with the cutting line marked on the workpiece, but instead needs to first measure the distance between the saw blade and the side edges of the base plate and then fix the guide means in a position in which the distance between the guide surface and the cutting line is equal to said distance, which is cumbersome to operate and, in particular, inefficient when performing cuts that require a constant change of the position of the guide means; and because the measurement and when setting up the guider position according to the measuring result, all probably have certain error, consequently the cutting tool actually cuts the result and probably has some deviations with the line of cut, and cutting accuracy is lower.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a cutting tool which is high in cutting precision and convenient to use.

in order to solve the problems, the technical scheme of the invention is as follows: a cutting tool for cutting in cooperation with a guide, the guide having a guide face, the cutting tool comprising: a housing; a motor housed in the housing; the transmission mechanism is connected with the motor and used for driving a saw blade, and the saw blade is provided with a saw blade plane; the bottom plate is connected with the shell and comprises a first bottom plate with a first bottom surface and a second bottom plate with a second bottom surface, and an abutting surface coplanar with the plane of the saw blade is arranged on the second bottom plate and is used for being matched with the guide surface;

the first bottom plate is movably connected with the second bottom plate through a cam connecting mechanism; the cam connecting mechanism comprises a cam part abutted with the second bottom plate, and the cam part is rotatably connected to the first bottom plate; the cam part rotates to drive the second bottom plate to move relative to the first bottom plate, so that the abutting surface is exposed.

In one embodiment, the cam connection mechanism comprises a connection shaft connected with the first base plate; and the second bottom plate is provided with a through hole for the connecting shaft to pass through, and the connecting shaft passes through the through hole and is connected with the cam part.

In one embodiment, the connecting shaft is rotatably connected to the first base plate about its own axis, and the connecting shaft passes through the through hole to be fixedly connected to the cam portion.

In one embodiment, the connecting shaft is fixedly connected with the first bottom plate; the cam connecting mechanism further comprises a connecting sleeve which is in running fit with the connecting shaft, the connecting shaft penetrates through the through hole to be matched with the connecting sleeve, and the cam part is fixedly connected onto the connecting sleeve.

In one embodiment, the connecting shaft is designed as a screw bolt and the connecting sleeve is designed as a nut.

In one embodiment, the axis of rotation of the cam portion is parallel to the axis of rotation of the saw blade.

In one embodiment, the cutting tool is further provided with a guide means for guiding the second base plate to move relative to the first base plate in a direction perpendicular to the second bottom surface.

In one embodiment, the direction of extension of the through hole is configured to be perpendicular to the second bottom surface, and the guide means includes the through hole.

In one embodiment, the cam portion is fixedly connected with an operation portion for being operated by a user.

In one embodiment, a holding device is disposed between the first bottom plate and the second bottom plate, and the holding device is used for holding the first bottom surface of the first bottom plate and the second bottom surface of the second bottom plate to be coplanar.

In one embodiment, the retaining means comprises a spring, one end of which abuts the first base plate and the other end of which abuts the second base plate.

compared with the prior art, the cutting tool provided by the invention has the advantages that the cam part is abutted against the second bottom plate, so that the second bottom plate moves relative to the first bottom plate; on one hand, the structural design of the cam part is utilized, the force for promoting the second bottom plate to move is provided, and the operation is convenient; on the other hand, the self-locking effect of the cam part can keep the second bottom plate at a specific position relative to the first bottom plate when the abutting surface is matched with the guide device;

in order to solve the above problems, another technical solution of the present invention is: a cutting tool, the cutting tool comprising: a housing; a motor housed in the housing; the transmission mechanism is connected with the motor and used for driving a saw blade, and the saw blade is provided with a saw blade plane; the bottom plate comprises a first bottom plate and a second bottom plate which are movably connected, and the shell is connected with the first bottom plate;

The second bottom plate is provided with a butting surface, and the first bottom plate and the second bottom plate move relatively to expose the butting surface; the cutting tool further includes a locking mechanism for maintaining the abutment surface coplanar with the blade plane.

In one embodiment, the locking mechanism comprises a bolt and a nut in rotational engagement with the bolt; the bolt is fixedly connected with the first base plate, the second base plate is provided with a through hole for the bolt to pass through, and the bolt passes through the through hole to be matched with the nut.

In one embodiment, the locking mechanism comprises a bolt and a nut in rotational engagement with the bolt; the nut is fixedly connected with the first bottom plate, the second bottom plate is provided with a through hole for the bolt to pass through, and the bolt passes through the through hole to be matched with the nut.

In one embodiment, the locking mechanism includes a locking cam abutting the second base plate in a direction perpendicular to the plane of the saw blade, the locking cam being rotatably coupled to the second base plate.

In one embodiment, the rotational axis of the locking cam is parallel to the blade plane.

In one embodiment, the first bottom plate and the second bottom plate are relatively translated.

In one embodiment, the cutting tool further comprises a cam portion abutting the second base plate, the cam portion being rotatably connected to the first base plate; the cam part rotates to drive the second bottom plate to translate relative to the first bottom plate.

To solve the above problems, another embodiment of the present invention is: a cutting tool for cutting in cooperation with a guide, the guide having a guide face, the cutting tool comprising: a housing; a motor housed in the housing; the transmission mechanism is connected with the motor and used for driving a saw blade, and the saw blade is provided with a saw blade plane; a bottom plate including a first bottom plate having a first bottom surface, a second bottom plate having a second bottom surface; wherein the housing is connected to the first bottom plate, the second bottom plate is provided with an abutting surface that engages with the guide surface, and the first bottom surface is supported by the guide means when the abutting surface engages with the guide surface,

Wherein the cutting tool is further provided with a locking mechanism for maintaining the abutment surface coplanar with the saw blade plane when the abutment surface is mated with the guide surface.

According to the cutting tool provided by the invention, due to the arrangement of the locking mechanism, the technical problems that the actual cutting result is not aligned with the cutting line and the cutting precision is low due to the fact that the first bottom plate is movably connected with the second bottom plate, and the abutting surface arranged on the second bottom plate is not coplanar with the saw blade plane which keeps relatively constant relative to the position of the first bottom plate are solved.

Drawings

The invention is further described with reference to the following figures and embodiments.

FIG. 1 is a front perspective view of a cutting tool provided by the present invention;

Fig. 2 is a rear perspective view of the cutting tool shown in fig. 1.

Fig. 3 is a left side perspective view of the cutting tool shown in fig. 1.

Fig. 4 is a front view of the cutting tool of fig. 1 in use with the second bottom surface in a first position coplanar with the first bottom surface.

Fig. 5 is a partially exploded view of the base plate of the cutting tool shown in fig. 1, wherein a-a shows a close-up view of the cam portion.

Fig. 6 is a front perspective view of the base plate of the cutting tool shown in fig. 1, with the second bottom surface in a second position that is non-coplanar with the first bottom surface.

fig. 7 is a front view of the cutting tool of fig. 1 in use with the second bottom surface in a second position non-coplanar with the first bottom surface.

Fig. 8 shows a schematic sketch of a locking mechanism according to another embodiment of the invention, wherein 8a is a schematic sketch of the locking mechanism acting on the second base plate in a first position and 8b is a schematic sketch of the locking mechanism acting on the second base plate in a second position.

Detailed Description

the present embodiment is described with reference to an electric circular saw as an example. However, the cutting tool of the present invention is not limited to the electric circular saw, and may be other, particularly portable power tools. In addition, in the description of the present invention, unless otherwise specified, directional terms such as front, rear, left, right, up, down, and the like are relative to the direction in which the power tool shown in fig. 1 is normally used, such as defining the forward direction of the power tool as front, the direction opposite to the forward direction of the power tool as rear, and the like.

Referring to fig. 1 to 3, the present invention provides an electric circular saw 1, which includes a housing 20, a motor (not shown) accommodated in the housing 20, a saw blade 22 driven by the motor through a transmission mechanism (not shown), and a bottom plate 24 connected to the housing 20.

The housing 20 extends longitudinally as a whole, and houses a motor and a transmission mechanism therein. A transmission is generally located between the motor and the saw blade 22 for transmitting power from the motor to the saw blade 22 to drive the saw blade 22 in a rotational motion. The housing 20 extends lengthwise parallel to the motor axis, which is perpendicular to the saw blade shaft axis. Preferably, the centerline of the housing 20 is collinear with the axis of the motor.

The saw blade 22 of the present invention is a circular saw blade and is coupled to a saw blade shaft 23. Since the saw blade 22 has a certain thickness, the saw blade 22 has several blade planes in the thickness direction thereof. Of course, the blade 22 may be idealized, and the plane in which the blade 22 lies may be defined as the blade plane when the thickness is considered to be extremely small. In the following description, the blade plane is the plane in which the blade 22 lies when the blade 22 is idealized to consider its thickness to be extremely small. The cutting plane of the blade 22 furthest from the housing 20 is defined as a first side cutting plane 27 and the cutting plane closest to the housing 20 is defined as a second side cutting plane 29. It will be appreciated that the first side cutting plane 27 and the second side cutting plane 29 are parallel to each other and to the plane of the blade.

The bottom plate 24 has a bottom surface 26 and a blade slot 28 through which the saw blade 22 passes. In operation, the bottom surface 26 abuts the workpiece and the blade 22 cuts the workpiece through the blade slot 28.

Referring again to fig. 1 and 2, the base plate 24 is movably coupled to the housing 20. In the present invention, the base plate 24 is pivotally connected to the housing 20 about a pivot axis X1. The pivot axis X1 is perpendicular to the plane of the blade so that when the housing 20 rotates the blade 22 about the pivot axis X1, the distance the blade 22 extends from the bottom surface 26 can be varied, thereby varying the depth of cut. A depth adjusting mechanism 30 and a depth locking mechanism are arranged between the bottom plate 24 and the shell 20.

The depth adjusting mechanism 30 includes a depth slide rail 31 extending lengthwise and provided on one of the bottom plate 24 and the housing 20, and a depth slider 33 provided on the other of the bottom plate 24 and the housing 20 and coupled to the depth slide rail 31. The depth fixing slide rail 31 may be an arc-shaped guide rail, and the center of the arc where the guide rail is located corresponds to the pivot axis X1. Of course, the extending direction of the depth setting slide rail 31 may be substantially perpendicular to the bottom surface 26, and the depth setting slider 33 slides in the depth setting slide rail 31 to adjust the distance that the saw blade 22 extends out of the bottom surface 26, thereby adjusting the cutting depth of the saw blade 22. The extending direction of the depth setting slide rail 31 is substantially perpendicular to the bottom surface 26, and the depth setting slide rail 31 does not need to extend along a straight line as long as the longitudinal extending direction is substantially perpendicular to the bottom surface 26.

a depth stop mechanism (not shown) may hold the depth slide 33 in a particular position relative to the slide track 31 so that the saw blade 22 extends a particular distance beyond the bottom surface 26 to cut a slot of a particular depth in a workpiece. The depth-setting locking mechanism can be a thread locking mechanism, a cam locking mechanism and other conventional structures, and is not described in detail.

Referring again to fig. 1 and 3, the base plate 24 is movably coupled to the housing 20. In the present invention, the base plate 24 is rotatably attached to the housing 20 about a chamfer axis X2. The bevel axis X2 is parallel to the bottom surface 26 such that when the housing 20 rotates the saw blade 22 about the bevel axis X2, the distance the saw blade 22 extends from the bottom surface 26 can be varied, thereby changing the cutting angle and making an angled cut. A bevel adjustment mechanism 36 and a bevel locking mechanism are also provided between the base plate 24 and the housing 20.

The bevel adjustment mechanism 36 includes a longitudinally extending bevel slide rail 37 provided on one of the base plate 24 and the housing 20, and a bevel slide 39 provided on the other of the base plate 24 and the housing 20 to mate with the bevel slide rail 37. The extension direction of the bevel slide rail 37 is arranged at an acute angle or an obtuse angle with the bottom surface 26, and the bevel sliding piece 39 can slide in the bevel slide rail 37 to adjust the angle of the saw blade plane relative to the bottom surface 26, thereby adjusting the cutting angle of the saw blade 22. Preferably, the bevel slide 37 is an arc-shaped guide rail, and the center of the arc where the guide rail is located on the bevel axis X2.

A miter lock mechanism (not shown) can hold the miter slide 39 in a particular position relative to the miter slide rail 37 so that the saw blade 22 is held at a particular angle relative to the bottom surface 26 for miter cuts. The beveling locking mechanism can be a thread locking mechanism, a cam locking mechanism and other conventional structures, and detailed description is omitted.

Referring to fig. 1 again, the electric circular saw 1 further includes a fixed guard 40 fixedly connected to the housing 20, and the fixed guard 40 covers a portion of the saw teeth of the saw blade 22 located on the upper side of the bottom plate 24 to prevent injury. And the base plate 24 is connected to the housing 20 through the fixed shield 40.

the electric circular saw 1 further includes a movable guard 42 movably connected to the housing 20, and the movable guard 42 covers another portion of the saw teeth of the saw blade 22 located on the lower side of the bottom plate 24 when the electric circular saw 1 is not in use. Accordingly, most of the saw teeth of the saw blade 22 are accommodated in the fixed guard 40 and the movable guard 42 when the electric circular saw 1 is not in use. When the electric circular saw 1 is used, the movable guard 42 is pushed by the workpiece to rotate so as to expose a part of saw teeth of the saw blade 22 located on the lower side of the bottom plate 24, and the saw blade 22 can smoothly cut the workpiece. The movable guard 42 is further provided with a movable guard opener 44, and when the electric circular saw 1 is used, an operator may manually push the opener 44 to rotate the movable guard 42 to expose the portion of the saw teeth covered thereby.

In the present invention, the housing 20, the depth setting adjusting mechanism 30, the depth setting locking mechanism, the bevel adjusting mechanism 36 and the bevel locking mechanism are all disposed on the same side of the fixed shield 40.

referring to fig. 5 to 7, in the present invention, the bottom plate 24 includes a first bottom plate 110 and a second bottom plate 120 movably connected to the first bottom plate 110. The first base plate 110 is connected to the housing 20 so as to be rotatable about a pivot axis X1.

Specifically, the first bottom plate 110 includes a first blade slot 111 for the saw blade 22 to pass through and a first bottom surface 112 abutting against the surface of the workpiece; the second base plate 120 includes a second blade groove 121, a second bottom surface 122, and a first side surface 124. Here, the first side surface 124 is an abutting surface for abutting against the guide 150. Preferably, the first side surface 124 is perpendicular to the second bottom surface 122. Of course, the first side surface 124 does not have to be perpendicular to the second bottom surface 122, as long as the first side surface 124 is adapted to the guide 150. The second base plate 120 also includes a second side 126 that abuts the guide 150 and is coplanar with the blade plane of the saw blade 22. Preferably, the second side surface 126 is disposed perpendicular to the second bottom surface 122. Of course, the second side 126 need not be perpendicular to the second bottom surface 122, so long as the second side 126 is adapted to the guide 150. In this manner, the second side 126 is exposed for engagement with the guide 150 when the second base plate 120 is moved relative to the first base plate 110.

the guide 150 may be a straight ruler made of plastic or wood, which is commonly used in daily life, and has a guide surface 151 capable of being fitted to a cutting line marked on the workpiece W in advance and guiding the circular saw 1 to move along the cutting line. Of course, the guide 150 may be made of other materials having a guide surface 151, such as cut building materials or other materials having a guide surface 151. In particular, for example, several different types of standard wood are commercially available, which have very smooth guiding surfaces 151, which are a very good source of guiding means.

The first base plate 110 is movably coupled to the second base plate 120 via a coupling mechanism such that the second bottom surface 122 has a first position (see fig. 1, 4) coplanar with the first bottom surface 112 and a second position (see fig. 6, 7) non-coplanar with the first bottom surface 112.

In the present embodiment, the connection mechanism is a cam connection mechanism. The cam connecting mechanism comprises a cam part abutted with the second bottom plate, and the cam part is rotatably connected to the first bottom plate. When the cam portion rotates, it will drive the second base plate to move relative to the first base plate.

Referring to fig. 5 to 7, the first base plate 110 and the second base plate 120 are movably connected by a cam connection mechanism 130. The cam connecting mechanisms 130 are two sets, and are respectively disposed in front and rear of the bottom plate 24 along a cutting direction of the electric circular saw 1 and on a side of the positioning guard 40 away from the housing 20.

The cam connecting mechanism 130 includes a cam portion 132, a connecting shaft 134, and a connecting sleeve 136 rotatably engaged with the connecting shaft 134. The cam portion 132 is fixedly connected with the connecting sleeve 136. Specifically, the cam portion 132 is provided with a through groove 135, and a connecting sleeve 136 is fixedly connected in the through groove 135.

the first base plate 110 extends upward from the first bottom surface 112 to form a first sidewall 114, the first sidewall 114 is formed with a hole portion 116, and the hole portion 116 is disposed through the first sidewall 114. The connection shaft 134 passes through the hole portion 116 and is fixedly connected to the first base plate 110. The second base 120 extends upwardly from the second bottom surface 122 to a second side wall 128, and the second side wall 128 includes a second side surface 126. The second side wall 128 defines a through hole 129 for the connection shaft 134 to pass through. The connecting shaft 134 passes through the through hole 129 to be engaged with the connecting sleeve 136. Thus, when the cam portion 132 is rotated, it will abut against the second base plate 120 and drive the second base plate 120 to move relative to the first base plate 110.

For convenience of operation, the operation portion 133 is fixedly connected to the cam portion 132, and driving the operation portion 133 can drive the cam portion 132 to rotate, and finally, the second base plate 120 moves relative to the first base plate 110.

In the present embodiment, the connection shaft 134 is configured as a bolt, and the connection sleeve 136 is configured as a nut.

In a possible embodiment, the nut 136 may be fixedly disposed on the first base plate 110, and the second base plate 120 is opened with a through hole 129 for passing the bolt 134, and the bolt 134 passes through the through hole 129 to be engaged with the nut 136.

in a possible embodiment, only a connecting shaft can be provided. Similar to the above scheme, the second bottom plate extends upwards to form a second side wall from the second bottom surface, the second side wall includes a second side surface matched with the guiding device, and the second side wall is provided with a through hole for the connecting shaft to pass through. The difference is that the connecting shaft is rotatablely connected with the first bottom plate around the axis of the connecting shaft, and the other end of the connecting shaft penetrating through the through hole is fixedly provided with a cam part. In this manner, when the cam portion rotates, it can drive the second base plate to move relative to the first base plate, and eventually expose the second side. In one possible embodiment, the connecting shaft can be designed as a rivet.

For reasons of dimensioning rationale, the axis of rotation X3 of the cam portion 132 relative to the first base plate 110 is parallel to the axis of rotation of the saw blade 22.

The outer surface of the cam portion 132 includes an asymptotic segment 1321(MN) and a circular arc segment 1322(NP), and the distance of the asymptotic segment 1321 from the rotation axis X3 gradually increases in the rotation direction F of the cam portion 132. That is, when the operating portion 133 is rotated in the direction F and the asymptotic segment 1321 abuts against the second base plate 120, the distance that the second base plate 120 moves with respect to the first base plate 110 increases; in the rotation direction F of the cam portion 132, the circular arc segment 1322 is constant in distance from the rotation axis X3 and is maintained at the farthest distance from the rotation axis X3. That is, when the operating portion 133 is rotated in the direction F and the arc segment 1322 abuts against the second base plate 120, the second base plate 120 is held at the position farthest from the distance moved by the first base plate 110. With this arrangement, when the second base plate 120 moves the farthest distance with respect to the first base plate 110, the cam portion 132 and the second base plate 120 come into contact with each other in the form of surface contact, and reliable abutment between the cam portion 132 and the second base plate 120 can be achieved.

In order to guide the second base plate 120 to move in a vertical direction with respect to the first base plate 110, that is, in a direction perpendicular to the second bottom surface 122, the electric circular saw 1 is further provided with a guide means.

In the present embodiment, the extending direction of the through hole 129 is designed to be perpendicular to the second bottom surface 122. In this manner, when the cam portion 132 is rotated to drive the second base plate 120 to move relative to the first base plate 110, the engagement of the connecting shaft 134 with the through hole 129 will cause the second base plate 120 to move only in the vertical direction relative to the first base plate 110. That is, in the present embodiment, the through-hole 129 having the extending direction perpendicular to the second bottom surface 122 functions as a guide means.

Of course, a set of guide means may be provided separately from the cam linkage. For example, a sliding block is fixedly arranged on the first bottom plate, and a sliding groove matched with the sliding block is correspondingly arranged on the second bottom plate. The extending direction of the sliding groove is perpendicular to the second bottom surface. Therefore, when the cam part drives the second bottom plate to move relative to the first bottom plate, the sliding fit of the sliding block and the sliding groove enables the second bottom plate to move relative to the first bottom plate only along the direction perpendicular to the second bottom surface.

A holding device is further disposed between the first base plate 110 and the second base plate 120. The holding means serves to hold the first bottom surface 112 of the first base plate 110 coplanar with the second bottom surface 122 of the second base plate 120.

In this embodiment, the retaining means comprises a spring 139. The upper end surface of the spring 139 abuts against the second base plate 120, and the lower end surface of the spring 139 abuts against the receiving portion 118 of the first base plate 110.

when the operating portion 133 is not driven, the cam portion 132 is separated from the second base plate 120. The springs 139 maintain the second bottom surface 120 in a first position coplanar with the first bottom surface 112, as shown in fig. 1 and 4. The bolt 134 and the nut 136 are in loose engagement and can still rotate relative to each other, and a gap exists between the first side wall 114 and the second side wall 128.

When the user drives the operation portion 133 to rotate against the urging force of the spring 139, the cam portion 132 comes into contact with the second base plate 120; as the operating portion 133 is further rotated, the cam portion 132 pushes the second base plate 120 to move downward, and the second side surface 126 is exposed; at the same time, the rotation of the operating portion 133 brings the nut 136 into further engagement with the bolt 134. When the cam portion 132 is rotated until the circular arc segment 1322 abuts against the second base plate 120, the second base plate 120 moves down to a position farthest from the first base plate 110; with the second side wall 128 abutting the first side wall 114 with further engagement of the nut 136 and bolt 134, the distance between the two is negligible. At this time, the second base plate 120 is in the second position, as shown in fig. 6 and 7. By loosening the operating portion 133, the thread friction between the nut 136 and the bolt 134 is sufficient to overcome the force of the spring 139, and the second base plate 120 is fixed in this position.

Of course, due to the self-locking effect of the cam, when the second base plate 120 moves down to the position farthest from the first base plate 110, i.e., when the circular arc segment 1322 of the cam portion 132 abuts the second base plate 120, the cam portion 132 itself maintains the second base plate 120 at the position. Because the cam portion 132 is now exposed, the force from the second base plate 120 will be directed toward the center of the circular arc 1322. The cam portion 132 does not rotate regardless of the amount of force applied to the cam portion 132 by the second base plate 120.

It is understood that operating the operating portion 133 to switch the second base plate 120 between the first position and the second position means that both the operating portions 133 of the front and rear sets of cam connecting mechanisms 130 are operated.

Although the threaded connection between the bolt 134 and the nut 136 can make the second base plate 120 move toward the first base plate 110, the second base plate 120 at the second position is already in the state of abutting against the first base plate 110, and further cooperation between the bolt 134 and the nut 136 only makes the abutting between the first sidewall 114 and the second sidewall 128 tighter, and does not cause a change in the distance therebetween. Thus, as long as the second base plate 120 reaches the second position, i.e., the circular arc segments 1322 of the two sets of cam portions 132 contact the second base plate 1322, the second side 126 of the second base plate 120 is coplanar with the plane of the saw blade, regardless of whether the user continues to rotate the operating portion 133 or the rotational angles of the operating portions 133 of the front and rear sets of cam linkages 130 are not consistent.

In the present invention, the second side 126 is coplanar with the plane of the blade, meaning that: when the second base plate 120 is moved furthest from the first base plate 110, the second side surface 126 is coplanar with the plane of the blade when it is desired to effect a cut with the second side surface 126 in cooperation with the guide surface 151.

As shown in fig. 7, the first bottom surface 112 of the first base plate 110 is supported by the guide 150, the second side surface 126 of the second base plate 120 abuts against the guide surface 151 of the guide 150, and the electric circular saw 1 slides along the guide 150, so that the saw blade 22 can cut the workpiece W.

specifically, in actual operation, the second side 126 is coplanar with the second side cutting plane 29 of the saw blade 22. Thus, the electric circular saw 1 of the present invention is more convenient to use. Specifically, before cutting, the operator usually marks a cutting line on the workpiece W, and the cutting line may be drawn by ink or may be indicated by laser. The guide 150 has a guide surface 151. When cutting, firstly, the guide surface 151 of the guide device 150 is aligned with the cutting line marked on the workpiece W in advance, then the cam connecting mechanism 130 is adjusted to make the second bottom plate 120 translate relative to the first bottom plate 110 to expose the second side surface 126, and then the second side surface 126 abuts against the guide surface 151 of the guide device 150, because the saw blade plane is coplanar with the second side surface 126 of the second bottom plate 120, the saw blade plane is also closely attached to the guide surface 151, the track of the rotary cutting of the saw blade 22 is the track shown by the cutting line, and the cutting can be completed by moving the electric circular saw 1.

Thus, by the cooperation of the second base plate 120 with the guide means 150, the cutting can be carried out easily and quickly without the need to perform additional measurements before cutting and without the need to reserve space for the base plate 24 between the guide surface 151 and the cutting line. After the cutting is convenient, the cutting efficiency is higher.

Of course, the coplanar orientation of the blade plane and the second side 126 of the second base plate 120 is not limited to being absolutely coplanar, and it is within the scope of the present invention for the blade plane and the second side 126 to be parallel to each other and spaced apart from each other by a distance that is not absolutely coplanar due to gaps and tolerances associated with the mechanical structures.

In the present invention, the second blade groove 121 of the second bottom plate 120 through which the saw blade 22 passes is semi-closed, that is, the blade groove 121 of the second bottom plate 120 through which the saw blade 22 passes has an opening, so that the blade plane of the saw blade 22 can be flush with the guide surface 151.

The second base plate 120 is movably connected to the first base plate 110, so that the electric circular saw 1 can be switched between two different working states. As shown in fig. 4, in the first operating state, the first bottom surface 112 of the first base plate 110 and the second bottom surface 122 of the second base plate 120 are in contact with the workpiece W in a coplanar manner, and the first side surface 124 of the second base plate 120 is in contact with the guide surface 151 of the guide 150. As shown in fig. 7, in the second operating state, the first bottom surface 112 of the first base plate 110 abuts the upper surface of the guide 150, and the second side surface 126 of the second base plate 120 abuts the guide surface 151 of the guide 150. Therefore, in the first working state, the second side surface 126 of the second bottom plate 120 closes the first blade groove 111 of the first bottom plate 110, at this time, the saw blade 22 is located in the closed blade groove formed by the first bottom plate 110 and the second bottom plate 120 together, and the second side surface 124 of the second bottom plate 120 abuts against the guide surface 151 of the guide device 150, so that the traditional cutting can be realized, and the conventional use habit of the user can be met. In the second operating position, the second side 126 of the second base plate 120, which is approximately flush with the plane of the saw blade, abuts the guide surface 151 of the guide 150, allowing a quick cut.

Therefore, the electric circular saw 1 of this embodiment can realize traditional cutting, also can realize quick cutting, and second bottom plate 120 can be movable relatively first bottom plate 1, more can adapt to the plane of unevenness moreover, so made things convenient for user operation electric circular saw greatly.

It should be noted that, because the first bottom plate is movably connected with the second bottom plate, the position of the saw blade plane relative to the first bottom plate is relatively fixed, and the second side surface is arranged on the second bottom plate, once the first bottom plate and the second bottom plate shake, the first side wall cannot be tightly attached to the second side wall in the direction perpendicular to the saw blade plane, and the second side surface is probably deviated from the saw blade plane, thereby causing the problems of deviation between the actual cutting result and the cutting line and low cutting precision. Therefore, the electric circular saw needs to be designed with a locking mechanism, and when the first bottom plate and the second bottom plate are in the non-coplanar second position and the second side surface is required to abut against the guide surface to realize cutting work, the second side surface is ensured to be coplanar with the plane of the saw blade.

in this embodiment, the locking mechanism is the bolt 34 and the nut 136 rotatably engaged with the bolt 134.

In one possible embodiment, the locking mechanism is configured as a locking cam which abuts the second base plate in a direction perpendicular to the plane of the saw blade. Here, the abutment with the second bottom plate in a direction perpendicular to the plane of the saw blade means: when the locking cam abuts against the second base plate, the force from the second base plate to which the locking cam is subjected is perpendicular to the plane of the saw blade. Referring to fig. 5 to 7, when the second base plate 120 moves to the farthest from the first base plate 110, that is, the circular arc segment 1322 of the cam portion 132 abuts the second base plate 120, the cam portion 132 cannot rotate and can maintain the second base plate 120 at the second position farthest from the first base plate 110. Similarly, as shown in FIG. 8, the locking cam 140 is rotatably connected to the second base plate 120, and the rotation axis X4 of the locking cam 140 is parallel to the plane of the saw blade. In the first position, there is still a gap between the first sidewall 114 of the first base plate 110 and the second sidewall 128 of the second base plate 120, and the locking cam 140 is not in contact with the second base plate 120; when the second base plate 120 is moved to a second position furthest from the first base plate 110, the first side wall 114 abuts the second side wall 128, rotating the locking cam 140 until the arc segment of the locking cam 140 abuts the second base plate 120. In this manner, the second base plate 120 can be held tightly against the first base plate 110 in a direction perpendicular to the plane of the blade, and such that the second side 126 is coplanar with the plane of the blade.

in the present embodiment, the cam portion 132 for moving the second base plate 120 relative to the first base plate 110 is provided in the nut 136 of the lock mechanism. In one possible embodiment, the locking mechanism may be provided separately from the cam portion. For example, the cam portion is provided to abut against the second base plate and is rotatably connected to the first base plate. The user acts on the cam part to drive the second bottom plate to move relative to the first bottom plate; when the second base plate is moved to the second position, the user then acts on the locking mechanism to lock the relative positions of the first base plate and the second base plate such that the second side is coplanar with the plane of the saw blade.

In a possible embodiment, the cam portion can also be modified, provided that it is sufficient to act on the second base plate so that it can move relative to the first base plate.

It will be appreciated by those skilled in the art that the invention can be implemented in other ways, provided that the technical spirit of the invention is the same as or similar to the invention, or that any changes and substitutions based on the invention are within the protection scope of the invention.