WO2013040982A1

WO2013040982A1 - Cutting element, cutting assembly and cutting tool

Info

Publication number: WO2013040982A1
Application number: PCT/CN2012/080984
Authority: WO
Inventors: 张士松; 徐静涛
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2011-09-19
Filing date: 2012-09-05
Publication date: 2013-03-28

Abstract

Disclosed is a cutting element (11), comprising a main body (34), a mounting hole (18) provided on the main body (34), at least two cutting portions (25) provided at the edges of the main body (34), and the cutting element (11) also comprising abutting portions (24) corresponding one to one with the cutting portions (25); the range of the included angle between the connecting line between a cutting portion (25) and a respective abutting portion (24) and the radial connecting line of the abutting portion (24) to the centre of the cutting element (11) is from 0 degrees to 60 degrees. Also disclosed are a cutting assembly and a cutting tool comprising the abovementioned cutting element (11), the cutting element having a relatively long service life.

Description

Cutting elements, cutting components and cutting tools

The invention relates to a cutting element.

Background technique

In some garden tools, in order to cut weeds or trees in the garden, a cutting tool needs to be installed on the working head of the tool. The cutting tool is then moved manually or electrically to cut the target. There are many types of such cutting tools, such as metal wires or plastic wires having a large strength, a rotating chain with a sharp blade, a cutting blade made of a metal material, and the like.

However, in actual work, especially in the case of high-speed rotation of the cutting tool, the cutting tool tends to wear faster. Once wear occurs, the cutting effect is significantly reduced or even the cutting work cannot be completed, forcing the user to frequently change the cutting tool. The cumbersome replacement work can be labor intensive and time consuming, and the purchase of spare cutting tools can also increase costs.

In addition, when performing ground cutting work, there are often stones, roots and other obstacles that affect cutting on the ground. The hardness of these obstacles is relatively large, and the cutting tool causes great damage to the obstacle after rigidly colliding with the obstacle, further increasing the wear speed and the update frequency. Therefore, it is necessary to design a cutting tool that automatically avoids obstacles when it encounters obstacles.

Summary of the invention

In view of the above, it is an object of the present invention to provide a cutting element having a long service life. The technical solution adopted by the present invention to solve the problems of the prior art is: a cutting element, comprising: a main body, a mounting hole provided on the main body, at least two cutting portions provided on an edge of the main body, the cutting element further comprising a corresponding part of the cutting part In the civil connection, the connection between the cutting portion and the corresponding civilian joint and the radial connection between the civilian joint and the center of the cutting element range from 0 to 60 degrees.

Preferably, the abutment portion is located to extend from the mounting hole and communicate with the mounting hole.

Preferably, the 4 joints are symmetrical about the center of the cutting element.

Preferably, the 4 civil joint has a curved curved surface.

Preferably, the cutting element includes a plurality of extensions extending outwardly from the mounting aperture and symmetrical about the center of the cutting element, the cutting portion being located on the extension.

Preferably, the extension tapers in a direction in which it extends. Preferably, the cutting portion is located on one side surface of the extension.

Preferably, the cutting portion is located on both side surfaces of the extension.

Another object of the present invention is to provide a cutting element in which the pin is movably mated. The technical solution adopted is: a cutting element, comprising a main body, a mounting hole provided on the main body, at least two cutting portions provided on an edge of the main body, and the cutting element further comprises an abutting portion corresponding to the cutting portion, The abutting portion extends from the mounting hole and communicates with the mounting hole, and the radius of the mounting hole is not less than 8 mm.

Preferably, the mounting hole has a radius of 13 mm.

In comparison with the prior art, the advantageous effects of the present invention are: The cutting member has a plurality of cutting portions that are movably engaged with the pin shaft to alternately perform the cutting work, thereby having a long service life.

It is an object of the present invention to provide a cutting assembly having a long service life.

The technical solution adopted by the present invention to solve the prior art problem is: a cutting assembly comprising a rotating shaft, a connecting member rotating around the axis of the rotating shaft, a pin disposed on the connecting member, and a cutting sleeved on the pin shaft The component, the cutting element comprises at least three centrally symmetrical cutting portions, the cutting portion alternatively performing a cutting operation around the pin.

Preferably, the number of cutting elements is at least three, and the number of the pins is greater than or equal to the number of the cutting elements.

Preferably, the pin is radially in operative engagement with the cutting element.

Preferably, the cutting element includes a mounting hole through which the pin shaft is received and at least three abutting portions respectively engageable with the pin shaft, the abutting portion extending from the mounting hole and communicating with the mounting hole.

Preferably, the cutting portion corresponds to the male joint portion, and the angle between the line connecting the cutting portion and the corresponding joint portion and the radial connection between the joint portion and the center of the cutting member ranges from 0 to 60 degrees.

Preferably, the abutting portion includes a first abutting portion and a second abutting portion, and the cutting portion includes a first cutting portion corresponding to the first abutting portion and a second cutting portion corresponding to the second 4th engaging portion, when When the pin contacts the first 4 joint portion, the first cutting portion performs a cutting work; when the pin shaft contacts the second abutting portion, the second cutting portion performs a cutting work.

Another object of the present invention is to provide a cutting assembly that is capable of avoiding obstacles. The technical solution adopted is: a cutting assembly comprising a rotating shaft, a connecting member rotating about the axis of the rotating shaft, a pin disposed on the connecting member, a cutting member sleeved on the pin, the cutting member at least comprising a first cutting portion and a second cutting portion for performing a cutting operation, the cutting member is radially engaged with the pin shaft, thereby cutting The cutting element is movable between a first position in which the first cutting portion performs the cutting operation and a second position in which the second cutting portion performs the cutting operation with respect to the pin.

Preferably, the cutting assembly comprises at least three cutting elements that are symmetrical about a center of the axis of rotation. Preferably, the cutting element further comprises at least one third cutting portion, the first cutting portion, the second cutting portion and the third cutting portion being symmetrical about a center of the cutting element.

Preferably, the cutting member includes a mounting hole through which the pin shaft is received and an abutting portion in contact with the pin shaft, the abutting portion extending from the mounting hole and communicating with the mounting hole.

Another object of the present invention is to provide a cutting tool that is capable of avoiding obstacles and that does not require frequent replacement of cutting elements. The technical solution adopted is: a cutting tool comprising a motor, a motor-driven output shaft, a connecting member rotating around the output shaft axis, a pin shaft disposed on the connecting member, and a cutting member sleeved on the pin shaft The cutting element includes at least a first cutting portion and a second cutting portion that are capable of performing a cutting operation, the cutting member being radially movably engaged with the pin, such that the cutting member is capable of performing a cutting operation at a first position relative to the pin at the first cutting portion and The second cutting portion moves between the second positions where the cutting operation is performed.

Preferably, the cutting element moves from the first position to the second position relative to the pin as the speed of rotation of the cutting element about the axis of the output shaft changes.

Preferably, the cutting element moves from the first position to the second position relative to the pin when the cutting element is subjected to an external force that reaches or exceeds a predetermined value.

Compared with the prior art, the beneficial effects of the present invention are: The cutting assembly has a plurality of cutting portions, which can alternately perform cutting work without disassembly, and the cutting portion can encounter an obstacle Avoid rigid collisions and have a long service life.

DRAWINGS

The above described objects, technical solutions and advantageous effects of the present invention can be clearly obtained from the following detailed description of the embodiments of the present invention.

The same numbers and symbols in the drawings and the description are used to represent the same or equivalent elements. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of a cutting tool having a cutting assembly in accordance with a first embodiment of the present invention. Figure 2 is a schematic view of the cutting assembly shown in Figure 1.

3 is a schematic view of a cutting assembly of a second embodiment of the present invention.

4 is a schematic view of a cutting assembly of a third embodiment of the present invention.

5 is an exploded view of the cutting assembly shown in FIG.

6 is an exploded view of another angle of the cutting assembly shown in FIG.

7 is a schematic view of the cutting element and the pin shaft in the cutting assembly shown in FIG.

8 is a schematic view of a cutting member and a pin in the cutting assembly of the fourth embodiment of the present invention. 9 is a schematic view of a cutting member and a pin shaft in the cutting assembly of the fifth embodiment of the present invention. 10 is a schematic view of a cutting member and a pin in the cutting assembly of the sixth embodiment of the present invention. 11 is a schematic view of a cutting member and a pin shaft in the cutting assembly of the seventh embodiment of the present invention. 12 is a schematic view of a cutting member and a pin shaft in the cutting assembly of the eighth embodiment of the present invention. 13 is a schematic view of a cutting member and a pin in the cutting assembly of the ninth embodiment of the present invention. 14 is a schematic view of a cutting member and a pin in the cutting assembly of the tenth embodiment of the present invention. 15 is a schematic view of the cutting member and the pin shaft in the cutting assembly of the eleventh embodiment of the present invention. FIG. 16 is a schematic view showing the first cutting portion of the cutting member of FIG. 1 in the first position. Figure 17 is a schematic view of the first cutting portion of the cutting element of Figure 1 when it encounters an obstacle. Figure 18 is a schematic illustration of the movement of the cutting element of Figure 1 relative to the pin after encountering an obstacle. Figure 19 is a schematic illustration of the second cutting portion of the cutting element of Figure 1 in a second position. , lawn mower 2, housing 3, power source

, cutting assembly 5, rotating shaft 6, rotating shaft axis, output shaft 8, transmission 9, chassis

0, fixing element 11, cutting element 12, upper chassis

3, the lower chassis 14, the transmission rod 15, the pin

6, pin axis 17, pin hole 18, mounting hole

9, contact surface 20, through hole 21, retaining wall

Side surface 23, annular groove 24, abutment

5. Cutting part 26, extension part 27, fixing part

8, obstacles 29, bottom 30, top

1. First side 32, second side 33, boss 34. The main body 241 and the second abutting portion of the first abutting portion

251, first cutting portion 252, second cutting portion A, mounting hole cross-sectional area

B, pin cross-sectional area Ll, radial connection L2, connection

0, center

detailed description

A lawn mower 1 according to an embodiment of the present invention is shown in FIG. The lawn mower 1 has a casing 2 having a power source 3 therein, and the power source 3 may be a motor or other form of power supply device. The power source 3 has an output shaft 7. The lawn mower 1 also includes a cutting assembly 4 toward the bottom of the ground. Of course, the cutting unit 4 is not limited to being disposed at the bottom of the lawn mower 1, and the cutting unit 4 can be mounted at the front or the rear. After the mower 1 is in normal operation, the cutting unit 4 cuts the grass on the ground after moving at a high speed. The form of motion of the cutting assembly 4 can be in the form of rotation, linear reciprocation or rolling. Moreover, the cutting assembly 4 is not limited to being mounted on the lawn mower 1. For example, a garden tool such as a bush machine or a lawnmower can be used to mount the cutting assembly 4 protected by the present invention, and all cutting tools can be installed to protect the protection of the present invention. Cutting assembly 4.

1 and 2 show a cutting assembly 4 in accordance with an embodiment of the present invention. The cutting assembly 4 has a rotating shaft 5 which is rotatable about an axis 6 of the rotating shaft 5. A transmission 8 is provided between the rotating shaft 5 and the output shaft 7 of the power source 3, and the rotating shaft 5 is driven by the power source 3 of the transmission 8 to rotate. The power source 3 controls the driving of the rotating shaft 5 in a forward rotation or a reverse rotation. The transmission 8 can be a planetary gear drive or a belt drive that is common in the art. In the present embodiment, the cutting assembly 4 further includes a chassis 9 that rotates about an axis 6 of the rotating shaft 5. The chassis 9 is a thin disc. The chassis 9 constitutes a plane perpendicular to the axis 6 of the axis of rotation, with a central opening and the opening being sleeved with the rotating shaft 5. The rotary shaft 5 is located at the center of the chassis 9. The axial movement of the chassis 9 and the rotary shaft 5 is not possible by the axial fixing member 10, and the chassis 9 rotates with the rotary shaft 5.

The cutting assembly 4 further comprises a cutting element 11 arranged at the circumferential edge of the chassis 9, which rotates together about the axis of rotation 6 with the rotation of the chassis 9. In the present embodiment, the cutting assembly 4 comprises at least three cutting elements 11. The three cutting elements 11 are circumferentially distributed on the chassis 9. The angle between any two cutting elements and the center of the chassis 9 is 120 degrees, i.e. the cutting element 11 is centrally symmetrical about the axis of rotation 5. In other embodiments, the cutting elements 11 are not limited to three and may not be evenly distributed over the chassis 9. In the second embodiment shown in Fig. 3, there are two cutting elements 11. And The chassis 9 includes an upper chassis 12 and a lower chassis 13, and there is a space between the upper chassis 12 and the lower chassis 13, and the cutting member 11 is located in the spacing gap. The upper chassis 12 and the lower chassis 13 may be triangular, circular or other shapes. In a third embodiment as shown in Fig. 4, a transmission rod 14 is provided between the rotary shaft 5 and the cutting element 11, one end of the transmission rod 14 is coupled to the cutting element 11, and the other end of the transmission rod 14 is coupled to the rotary shaft 5 sockets. The rotary shaft 5 is caused to rotate the transmission rod 14 about its axis 6 while the transmission rod 14 rotates with the cutting element 1 1 along with the axis of rotation 6 .

As shown in Figures 5 and 6, the cutting assembly 4 further includes a pin 15. In the present embodiment, the pin 15 is fixedly disposed on the chassis 9, so that the pin 15 itself rotates about the axis of rotation 6 with the rotation of the chassis 9. The axis 16 of the pin 15 is arranged parallel to the axis 6 of the rotary shaft 5. A pin hole 17 is also provided at the circumferential edge of the chassis 9, and the inner wall of the pin hole 17 is provided with a thread, and the pin hole 17 and the fixing member 27 together fix the pin 15 to the chassis 9. The fixing member 27 is a spacer in this embodiment. The spacers may be provided integrally with the pin shaft 15 or may be non-integral. In the present embodiment, the pin 15 has a diameter of 5 mm to 6 mm. This is because the pin 15 rotates at a high speed during operation, and if the pin 15 is too thin, the internal stress is insufficient and it is easily damaged. If the pin 15 is too thick, the mass is relatively large, and the same amount of energy is consumed by the rotation. The pin 15 and the cutting element 1 1 are - mated so that the pin 15 and the number are greater than or equal to the number of cutting elements 11.

In the first embodiment shown in Fig. 7, the cutting element 11 is generally substantially centrally symmetrical. The cutting element 11 has a body 34 on which a mounting hole 18 is provided to accommodate axial insertion of the pin 15. The cross-sectional area A of the mounting hole 18 in the direction of the vertical rotation axis 6 is larger than the cross-sectional area B of the pin 15, so that the pin 15 can easily pass axially through the mounting hole 18. And after the pin 15 passes through the mounting hole 18, the mounting hole 18 also has a certain gap. The radius of the mounting hole 18 cannot be less than 8 mm. This is because since the diameter of the pin 15 is 5 to 6 mm, the radius of the mounting hole 18 cannot be less than 8 mm so that the pin 15 passes through the mounting hole 18 without any hindrance. In the present embodiment, the mounting hole 18 has a radius of 13 mm. The mounting hole 18 is loosely engaged with the pin 15, and the pin 15 is radially movable within the mounting hole 18. The mounting hole 18 also has a contact surface 19 that is in contact with the pin 15. The contact surface 19 of the mounting hole 18 abuts against the side surface of the pin 15 to generate an interaction force. When the cutting element 1 1 is rotated with the chassis 9 about the axis of rotation 6, the cutting element 11 produces a centrifugal force in the radial direction of the axis of rotation 5. The centrifugal force is generated by the rotation of the cutting member 11 about the axis of rotation 6, and as long as the cutting element 11 is rotated, it generates centrifugal force. The action of the centrifugal force pushes the cutting element 11 radially outward. Since the pin 15 is fixed to the chassis 9, It does not move by itself. When the centrifugal force pushes the cutting element 11, the cutting element 11 produces a radial movement relative to the pin 15. Thereby the position of the pin 15 in the mounting hole 18 is changed. When the side of the pin 15 abuts the contact surface 19 of the cutting element 11, the pin 15 can provide a radial force to the cutting element 11 to counteract the centrifugal force. In the present embodiment, the mounting hole 18 is a through hole 20 provided in the center of the cutting member 11. The center of the through hole 20 coincides with the center of the cutting element 11. In other embodiments, the center of the through hole 20 may also not coincide with the center of the cutting element 11. In the present embodiment, the contact surface 19 is a barrier wall 21 forming the through hole 20. The retaining wall 21 is located on the circumferential side of the through hole 20, and the retaining wall 21 can be in contact with the side surface 22 of the pin 15.

As shown in Fig. 7, the contact surface 19 on the edge of the mounting hole 18 also has an abutment portion 24. The abutment portion 24 and the mounting hole 18 are in spatial communication so that the pin 15 is free to move within the 4 gusset portion 24 and within the mounting hole 18. The pin 15 can be connected to the cutting element 11 in the 4th joint 24 . The pin 15 can also be moved from the abutment portion 24 into the mounting hole 18. The abutment portion 24 mainly limits the pin 15 . Since the cutting element 11 is in a radially movable engagement with the pin 15, the pin 15 can be in contact with the cutting element 11 at any one of the contact faces 19. However, the contact position is not stable, and if there is a small external force, the pin 15 can be moved away from the contact position to enter another contact position. The function of the abutting portion 24 is to restrict the pin 15 from coming into contact with the abutting portion 24 of the predetermined contact surface 19 when the pin 15 and the cutting member 11 are in contact with each other, and maintain a stable state. The pin 15 can always contact the cutting element 11 within the abutment portion 24 unless a sufficiently large external force can reach or exceed a preset value. Further, the number of the abutting portions 24 is at least two, that is, there are at least two of the four engaging portions 24 such that the pin can be contacted between the two abutting portions or between the two abutting portions 24. In the present embodiment, the number of the abutting portions 24 is six, and is evenly distributed on the contact surface 19. The angle between the center of the adjacent two abutting portions 24 to the center of the mounting hole 18 is 60 degrees. Further, the abutting portion 24 on the contact surface 19 is a curved curved surface. The curved curved surface and the surface of the pin 15 are matched to facilitate the close contact of the pin 15 and the abutment portion 24. The curved curved surface is radially outwardly convex away from the center of the cutting member 11, and the curved radius of the J-shaped portion 24 is smaller than the curved radius of the mounting hole 18. Of course, the abutting portion 24 is not limited to the form of a curved curved surface, and the abutting portion 24 may be in the form of a convenient positioning such as a groove, a claw, a wedge, or the like.

In order to achieve the cutting action, the cutting element 11 also has a cutting portion 25 provided at the edge of the body 34. As shown in FIG. 7, the cutting element 11 extends outwardly from the mounting aperture 18 out of the extension 26. And the extension 26 is located at the outer edge of the cutting element 11. In this embodiment, the cutting element 11 includes six extensions 26, The extension 26 is arranged symmetrically about the center of the cutting element 11. Each extension 26 has two sides extending substantially radially along the cutting element 11, the two sides facing outward, and the two sides are not strictly parallel to each other. Its extension lines can intersect. In the present embodiment, the extension 26 has a generally trapezoidal cross-section with substantially parallel bottom ends 29 and tips 30, and two sides joining the bottom end 29 and the top end 30. The two sides are a first side 31 and a second side 32. The extension lines of the two sides 31 and 32 may intersect. The bottom end 29 is disposed closer to the mounting hole 18 of the cutting element 11, and the top end 30 is disposed further away from the mounting hole 18. The cutting portion 25 is located on the first side 31 of the extension 26. And the cutting portion 25 is disposed substantially on the first side 31 from the top end 30 up to the bottom end 29. Since the cutting portion 25 is provided on the first side surface 31 of each of the extending portions 26, in the present embodiment, the number of the cutting portions 25 is six, which is also symmetrical with respect to the center of the cutting member 11. The advantage of this arrangement is that the operating state of each cutting portion 25 of the cutting element 11 is kept consistent.

It is to be noted that, in the present embodiment, the abutting portion 24 and the cutting portion 25 of the cutting member 11 are both symmetrical with respect to the center of the cutting member 11, and the number of the abutting portions 24 is equal to the number of the cutting portions 25. Further, the abutting portion 24 of the outer cutting portion 25 and the contact surface 19 has a corresponding relationship. As shown in Fig. 7, the first cutting portion 251 and the first portion 4 of the first cutting portion 251 are taken as an example. The first cutting portion 251 and the first portion 4 are respectively located on both sides of the center of the cutting member 11. And the line between the first cutting portion 251 and the first abutting portion 241 substantially passes through the center of the cutting element 11, so it can be said that the first cutting portion 251 and the first portion 4 are substantially located at the diameter of the cutting member 11. Both ends. Of course, the present invention does not limit the connection between the first cutting portion 251 and the first abutting portion 241 through the center of the cutting member 11, but the correspondence between the two may be within a certain range. According to the experimental data, the radial line L1 between the first abutting portion 241 and the center of the cutting element 11 and the line L2 between the first cutting portion 251 and the corresponding first abutting portion 241 are radial. The angle formed between the line L1 and the line L2 ranges from 0 to 60 degrees. The advantage of this arrangement is that when the cutting element 11 is rotated about the axis of rotation 6 , the cutting edge of the cutting portion 25 forms an ideal cutting line, which helps to improve the cutting efficiency. Of course, in the preferred embodiment, the angle between the radial connection L1 and the line L2 ranges from 0 to 30 degrees. In the present embodiment, the angle between the radial line L1 and the line L2 is 0 degree.

The cutting element 11 has a plurality of cutting positions. In each position, there is a state in which one cutting portion 25 and its corresponding 4 joint portion 24 are in operation, while the other cutting portions 25 and their corresponding abutting portions 24 are not in a working state. . As shown in FIG. 16, the power source 3 drives the rotating shaft 5 to rotate, with The movable chassis 9 and the pin 15 fixed to the chassis 9 are rotated about the axis of rotation 6 . Since the cutting element 11 is sleeved on the pin 15, the cutting element 11 also rotates about the axis of rotation 6 and thereby generates a centrifugal force. The centrifugal force is a radius along the axis of rotation 6 and in a direction away from the axis 6. Therefore, under the action of the centrifugal force, the cutting element 11 is moved radially with respect to the pin 15 until the pin 15 and the first abutting portion 241 abut. After the first abutting portion 241 is in contact with the pin 15, the pin 15 is supplied to the cutting member 11 having the first abutting portion 241. This force is exactly equal to the centrifugal force generated by the cutting element 11, and the direction is opposite. As a result, the force and the centrifugal force cancel each other out, and the pin 15 is always located in the first abutting portion 241 and is in contact with the cutting element 114. The cutting element 11 is maintained in a relatively stable positional relationship with the pin 15. At this time, the first cutting portion 251 corresponding to the first 4th joint portion 241 is in a cutting state, and the first cutting portion 251 is located at the outermost surface of the chassis 9, facilitating cutting of the cutting object (for example, weeds, shrubs, etc.). At this time, the cutting element 11 is in the first cutting position, and the cutting element 11 is always in the first cutting position while maintaining the cutting tool 1 to maintain the hook speed operation, and the first abutting portion 241 is always in contact with the pin 15 The corresponding first cutting portion 251 is always performing the cutting operation; the other abutting portions 24 are not in contact with the pin 15, and the corresponding cutting portion 25 does not perform the cutting operation. However, when the cutting element 11 is switched to the second cutting position, as shown in Fig. 19, the second abutting portion 242 abuts against the pin 15, and the second cutting portion 252 performs the cutting operation. Therefore, when the cutting element 11 is in the cutting position, there is only one abutting portion 24 in contact with the pin 15, and the corresponding cutting portion 25 of the abutting portion 24 performs a cutting operation. When the cutting member 11 is rotated about the axis of rotation 6 to continuously change the cutting position, the cutting portion 25 on the cutting member 11 alternately performs the cutting operation. Moreover, each of the cutting portions 25 has a chance to be in a cutting state, so that the plurality of cutting portions 25 perform the cutting work in turn. This greatly increases the service life of the cutting element 11. Assuming that the cutting element has N cutting portions, the cutting element has a service life of N times higher than that of a conventional cutting element having only one cutting portion.

Please see the cutting element 11 of the fourth embodiment shown in FIG. The cutting element 11 in the fourth embodiment is substantially similar to the cutting element 11 of the first embodiment shown in FIG. The only difference is the mounting hole 18 of the cutting element 11. In the fourth embodiment, the mounting hole 18 and the boss 33 on the chassis 9 cooperate to form an annular groove. The annular groove also has a radial extent greater than the diameter of the pin 15 to facilitate movement of the pin 15 within the annular groove. The outer peripheral wall of the annular groove is a contact surface 19 that is in contact with the pin 15. The abutment portion 24 is also located on the contact surface 19 and communicates with the mounting hole 18. Both the joint portion 24 and the cutting portion 25 are symmetrical about the center of the cutting element 11, and there is a corresponding relationship. Please see the cutting element 11 of the fifth embodiment shown in FIG. In the fifth embodiment, the cutting element 11 has four abutting portions 24. The mounting hole 18 has a substantially square structure. Similar to the previous embodiment, the mounting holes 18 are also in spatial communication with the four 4 joints 24. And the mounting holes 18 and 4 the joint portion 24 generally form a cross groove structure. The pin 15 can be movably mated with the mounting hole 18 or the abutment portion 24. The cutting element 11 has four extensions 26. The extension portion 26 has a square structure, and the cutting portion 25 is located on both side faces thereof. The advantage of this arrangement is that when the cutting element 11 is rotated clockwise about the axis of rotation 6, one of the cutting portions 25 on the extension 26 in the working state performs the cutting operation. When the cutting member 11 is rotated counterclockwise, the other cutting portion 25 can perform the cutting work, thereby avoiding the additional work of disassembling the cutting member 11 when the cutting tool 1 is switched forward and backward, thereby improving the work efficiency.

See the cutting element 11 of the sixth embodiment shown in FIG. In the sixth embodiment, the cutting member 11 has two cutting portions 25 and two engaging portions 24. The mounting hole 18 and the two 4 joint portions 24 are connected in the same space to form a slotted structure. The abutting portion 24 is located at both ends of the inline groove. The pin 15 is movable within the inline groove. The cutting element 11 has two square extensions 26 which are arranged symmetrically about the center of the cutting element 11. Each of the extensions 26 is provided with a cutting portion 25, respectively.

See the cutting element 11 of the seventh embodiment shown in Fig. 11. In the seventh embodiment, the mounting holes 18 and 4 of the cutting member 11 are similar to the mounting holes 18 and 4 of the first embodiment. The main difference is in the extension 26. In the present embodiment, the extension 26 is also symmetrical about the center of the cutting element 11. And the extension 26 also has a top end 29, a bottom end 30, a first side 31 and a second side 32. The top 29 tapers. The bottom end 30 is closer to the mounting hole 18. The cutting portion 25 is also located on the first side 31. But the main difference is the second side 32. The second side 32 has a bent portion, and thus the extension 26 has an irregular polygonal structure.

Please see the cutting element 11 of the eighth embodiment shown in FIG. In the eighth embodiment, the mounting holes 18 and 4 of the cutting member 11 are similar to the mounting holes 18 and 4 of the first embodiment. The main difference is the extension 26 and the cutting portion 25 on the extension 26. The first side face 31 and the second side face 32 of the extension portion 26 have the same shape and are axis-symmetrical. The first side 31 and the second side 32 have cutting portions 25, respectively. The reason for this arrangement is similar to that of the third embodiment, in order to avoid the work of disassembling the cutting member 11 additionally when the cutting tool 1 is switched in the forward and reverse directions.

Please see the cutting element 11 of the ninth embodiment shown in FIG. In the ninth embodiment, the mounting holes 18 and 4 of the cutting member 11 are similar to the mounting holes 18 and 4 of the first embodiment. the Lord The difference is the extension 26 . The extension 26 also has a top end 29, a bottom end 30, a first side 31 and a second side 32. The top end 29 tapers and the first side 31 and the second side 32 intersect at the top end 29. The bottom end 30 is closer to the mounting hole 18. The cutting portion 25 is also located on the first side 31. The first side 31 is substantially planar and the second side 32 has a bent portion. The entire extension 26 has a generally trapezoidal shape, and the cutting portion 25 is located on the bottom edge of the trapezoid.

See the cutting element 11 of the tenth embodiment shown in Fig. 14. In the tenth embodiment, the mounting hole 18 and the abutting portion 24 of the cutting member 11 are similar to the mounting hole 18 and the abutting portion 24 in the first embodiment. However, the abutting portion 24 and the cutting portion 25 are not - corresponding relationships. In the present embodiment, the cutting element 11 has twelve extensions 26 that are symmetric about its center. Each extension 26 has a generally triangular configuration. The cutting portion 25 is located on one side of the triangle. The cutting portion 25 on all the extensions 26 is also symmetrical about the center of the cutting element 11. However, each abutting portion 24 corresponds to two adjacent extending portions 26 and a cutting portion 25 on the extending portion 26. At the time of work, after the 4th joint part 24 and the pin 15 4 are connected, the corresponding two cutting parts 25 start cutting work. The advantage of the simultaneous operation of the two cutting sections 25 is the increased cutting surface and improved cutting efficiency.

See Fig. 15 for the cutting element 11 of the eleventh embodiment. The mounting holes 18 and 4 of the cutting member 11 are similar to the mounting holes 18 and 4 of the first embodiment. The main difference is the extension 26. The first side 31 and the second side 32 of the extension 26 are curved in different degrees of curvature, respectively, rather than straight lines. The cutting portion 25 is located on the first side 31, and the cutting edge of the cutting portion 25 is also curved to form a machete cut.

The operation of the lower cutting assembly will be described in detail below. First, under the power drive, the rotating shaft 5 drives the pin 15 and the cutting member 11 together at a high speed around the axis of rotation 6 through the chassis 9 or other means. Due to the radially operative engagement of the cutting element 11 with the pin 15, the cutting element 11 has a tendency to move radially outward along the axis 6 under the centrifugal force generated by the rotation, so that the contact surface 19 of the pin 15 and the cutting element 11 Abut. In the first abutting portion 241 of the contact surface 19, the pin 15 and the cutting member 11 are relatively abutted. At this time, the first cutting portion 251 corresponding to the first abutting portion 241 is at the first cutting position, and the cutting operation is performed, as shown in FIG. During the cutting process, when the first cutting portion 251 encounters the obstacle 27, the obstacle 27 contacts the first cutting portion 251 and is supplied with an external force as shown in FIG. When the external force reaches or exceeds a preset value, the cutting member 11 moves relative to the pin 15 such that the pin 15 is disengaged from the first abutment portion 241. And start moving inside the mounting hole 18 until the next step The abutting portion 24 is as shown in FIG. The direction of movement is random, ie the next abutment 24 is not determined. As the cutting element 11 moves, the first cutting portion 251 also leaves the first cutting position to avoid collision with the obstacle. Of course, the reason why the cutting member 11 is moved relative to the pin 15 is not limited to the case where the cutting portion 25 encounters an obstacle. When the rotational speed of the cutting element 11 about the axis of rotation 6 is varied, the cutting element 11 also moves relative to the pin 15. Those skilled in the art will appreciate that as the cutting element 11 changes its rotational speed, the centrifugal force generated by the rotation also changes accordingly, and the cutting element 11 will move relative to the pin 15. After the pin 15 enters the second 4th joint portion 242, the second cutting portion 252 corresponding to the second 4th joint portion 242 also enters the second cutting position, thereby continuing the cutting, as shown in FIG. The entire cutting element 11 has a plurality of cutting portions 25 which can be cut, thereby greatly extending the service life of the cutting member 11, while the cutting member 11 can be avoided when encountering an obstacle, thereby avoiding damage due to collision with an obstacle. .

The present invention is not limited to the foregoing embodiments, and other changes may be made by those skilled in the art in light of the spirit of the present invention. However, as long as the functions implemented are the same or similar to the present invention, they should be covered by the scope of the present invention. .

Claims

Claim

A cutting element comprising a main body, a mounting hole provided on the main body, and at least two cutting portions provided on an edge of the main body, wherein: the cutting element further includes a cutting portion Corresponding abutting portion, the angle between the connecting portion of the cutting portion and the corresponding abutting portion and the radial connection between the abutting portion and the center of the cutting element is in the range of 0 to 60 degree.

2. The cutting element according to claim 1, wherein: the abutting portion extends from the mounting hole and communicates with the mounting hole.

3. Cutting element according to claim 2, characterized in that the abutment is symmetrical about the centre of the cutting element.

4. The cutting element according to claim 2, wherein: the abutting portion has a curved curved surface.

5. The cutting element of claim 1 wherein: the cutting element includes a plurality of extensions extending outwardly from the mounting aperture that are symmetric with respect to a center of the cutting element, the cutting portion being located On the extension.

6. The cutting element according to claim 5, wherein: the extension portion is gradually narrowed in a direction in which it extends.

The cutting element according to claim 6, wherein the cutting portion is located on one side surface of the extending portion.

The cutting element according to claim 6, wherein the cutting portion is located on both side surfaces of the extending portion.

9. A cutting element, comprising a body, a mounting hole provided on the body, at least two cutting portions provided on an edge of the body, wherein: the cutting element further comprises a cutting portion Corresponding abutting portion extending from the mounting hole and communicating with the mounting hole, the mounting hole having a radius of not less than 8 mm.

The cutting element according to claim 9, wherein the mounting hole has a radius of 13 mm.

A cutting assembly comprising a rotating shaft, a connecting member rotating about the axis of the rotating shaft, a pin disposed on the connecting member, and a cutting member sleeved on the pin, wherein: The cutting element comprises at least three < symmetrical cutting portions, the cutting portion alternatively performing a cutting operation around the pin. The cutting assembly according to claim 11, wherein: the number of the cutting elements is at least three, and the number of the pins is greater than or equal to the number of the cutting elements.

The cutting assembly according to claim 11, wherein: said connecting member is a chassis that is sleeved on said rotating shaft, and said pin is fixedly disposed on said chassis.

The cutting assembly of claim 11 wherein: said pin is radially movably engaged with said cutting member.

The cutting assembly according to claim 11, wherein: said cutting member includes a mounting hole through which said pin shaft passes and at least three abutting portions respectively engageable with said pin shaft, said abutting The portion extends from the mounting hole and communicates with the mounting hole.

The cutting assembly according to claim 15, wherein: the cutting portion corresponds to the abutting portion, and a line connecting the cutting portion and the corresponding abutting portion and the abutting portion are The angle of the radial connection of the center of the cutting element ranges from 0 to 60 degrees.

The cutting assembly according to claim 16, wherein: the abutting portion includes a first abutting portion and a second abutting portion, and the cutting portion includes a first portion corresponding to the first 4 civil connecting portion a cutting portion and a second cutting portion corresponding to the second abutting portion, when the pin shaft contacts the first abutting portion, the first cutting portion performs a cutting operation; when the pin shaft contacts In the second abutting portion, the second cutting portion performs a cutting operation.

a cutting assembly comprising a rotating shaft, a connecting member rotating about the axis of the rotating shaft, a pin disposed on the connecting member, a cutting member sleeved on the pin, the cutting member including at least a first cutting portion and a second cutting portion performing a cutting operation, wherein: the cutting member is radially movably engaged with the pin, such that the cutting member is rotatable relative to the pin at the first cutting portion A first position in which the cutting operation is performed and a second position in which the second cutting portion performs the cutting operation.

A cutting assembly according to claim 18, wherein: said cutting assembly comprises at least three cutting elements, said cutting elements being symmetrical about a center of said axis of rotation.

A cutting assembly according to claim 18, wherein: said cutting member further comprises at least one third cutting portion, said first cutting portion, said second cutting portion and said third cutting portion being about a center of said cutting member symmetry.

A cutting assembly according to claim 18, wherein: said cutting element comprises a shelter A mounting hole through which the pin shaft passes and an abutting portion contacting the pin shaft, the abutting portion extending from the mounting hole and communicating with the mounting hole.

The cutting assembly according to claim 21, wherein: the cutting portion corresponds to the abutting portion, and a line connecting the cutting portion and the corresponding abutting portion and the abutting portion are The angle of the radial connection of the center of the cutting element ranges from 0 to 60 degrees.

a cutting tool comprising a motor, an output shaft driven by the motor, a connecting member rotating about the output shaft axis, a pin disposed on the connecting member, and a cutting member sleeved on the pin The cutting element includes at least a first cutting portion and a second cutting portion that are capable of performing a cutting operation, wherein: the cutting member is radially movably engaged with the pin shaft such that the cutting member can be opposite the pin The shaft moves between a first position at which the first cutting portion performs a cutting operation and a second position at which the second cutting portion performs a cutting operation.

The cutting tool according to claim 23, wherein: said cutting member includes a mounting hole through which said pin is received and an abutting portion in contact with said pin, said abutting portion being mounted from said The aperture extends and is in communication with the mounting aperture.

The cutting tool according to claim 24, wherein: the cutting member moves from the first position to the second position relative to the pin shaft when a speed at which the cutting member rotates about the axis of the output shaft changes.

The cutting tool according to claim 24, wherein: when said cutting member is subjected to an external force to a predetermined value or more, said cutting member is moved from said first position to said second position with respect to said pin.