Cutting tool

Abstract

The cutting tool comprises a shell, a driving piece, an output shaft and a trigger, an installation space and a holding part are formed in the shell, and the installation space is divided into a first area and a second area through an isolation part; the driving piece is positioned at one end of the holding part and provides power; the output shaft is connected to the driving part and used for mounting a working accessory; the trigger is connected to the shell, one part of the trigger is located in the second area, and at least one part of the trigger is located outside the shell; a first opening and an air inlet which are communicated with the first area are formed in the shell, the first opening is located in the end, close to the output shaft, of the shell, the air inlet is located in the end, away from the output shaft, of the holding part, a heat dissipation air channel is formed between the air inlet and the first opening, and the heat dissipation air channel is located in the first area. According to the cutting tool, the situation that the normal use of the tool is affected and even safety accidents are caused due to the fact that chippings are accumulated in the tool is avoided.

Description

Technical Field

[0001] This application belongs to the field of power tool technology, specifically relating to a cutting tool that prevents debris from accumulating inside. Background Technology

[0002] Electric circular saws, pistol drills and other power tools generate a lot of debris during operation. This debris can easily be sucked into the tool and accumulate inside. Accumulated debris may affect the normal use of the tool, reduce work efficiency, and may even cause safety hazards.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide a cutting tool for reducing the accumulation of chips inside the tool.

[0005] To achieve the above objectives, a specific embodiment of this application provides a cutting tool for preventing chip accumulation, including a housing, a drive member, an output shaft, and a trigger. The housing has a grip portion and an internal mounting space, which is divided into a first region and a second region by an isolation portion. The drive member is located at one end of the grip portion and provides power. The output shaft is connected to the drive member and is used to mount a working accessory. The trigger is connected to the housing, and a portion of the trigger is located in the second region and at least partly outside the housing. The housing has a first opening and an air inlet communicating with the first region. The first opening is located at the end of the housing near the output shaft, and the air inlet is located at the end of the grip portion away from the output shaft, forming a heat dissipation channel between the air inlet and the first opening. The heat dissipation channel is located in the first region.

[0006] In one or more embodiments of this application, the housing includes two detachably fixed housings, each housing including a bottom wall and a side wall protruding from the edge of the bottom wall, the side walls of the two housings abutting each other, the movable end of the trigger forming a first contact surface, the curvature of the first contact surface being configured to contact the side wall of the housing when the trigger is rotated; the trigger includes a pressing surface connected to the first contact surface, and a second contact surface connected to the pressing surface and extending in a direction away from the first contact surface, the curvature of the second contact surface being configured to contact the side wall of the housing when the trigger is rotated.

[0007] In one or more embodiments of this application, the trigger pivots within the housing, the isolation portion includes a limiting rib, and a switch is also provided within the housing. The switch is fixed to the bottom wall of one of the housings. When the trigger is pressed, the movable end of the trigger squeezes and triggers the switch.

[0008] In one or more embodiments of this application, the trigger has a limiting portion, and a limiting member is provided inside the housing on one side of the trigger. When the switch returns to its natural state, the limiting portion abuts against the limiting member.

[0009] In one or more embodiments of this application, the isolation portion includes a limiting rib, and the limiting rib is provided with a second opening, the second opening connecting the first region and the second region.

[0010] In one or more embodiments of this application, the limiting member includes a main body and an extension, the extension having a connecting portion communicating with the second opening.

[0011] In one or more embodiments of this application, the lever arm of the switch is greater than the lever arm of the limiting member.

[0012] In one or more embodiments of this application, a fixing groove is provided on the limiting rib, and a locking button is provided in the fixing groove. One of the housings has a button hole at the fixing groove position. The locking button includes a pressing part and a blocking part extending out of the housing through the button hole. A limiting part is provided on the trigger. When the trigger is in the natural state, the limiting part abuts against the blocking part. When the pressing part is triggered, the limiting part can rotate freely. A return spring is pressed between the pressing part and another housing. When the locking button is pressed, the blocking part disengages from the trigger.

[0013] In one or more embodiments of this application, a controller fixed to the housing is further included, the controller being located at the end of the grip portion away from the output shaft, and the controller being located in the heat dissipation duct.

[0014] In one or more embodiments of this application, the air inlet is located on the side of the controller.

[0015] Compared with the prior art, the cutting tool of this application has a first opening and an air inlet on the outer shell. The airflow generated by the working attachment ventilates and dissipates heat inside the tool, and the air inlet is far away from the output shaft, thereby reducing the amount and probability of debris flowing into the tool. The debris that enters the tool through the air inlet can also flow out through the first opening. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a cutting tool in one embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the internal structure of a cutting tool in one embodiment of this application;

[0019] Figure 3 This is an internal schematic diagram of the cutting tool from another angle in one embodiment of this application;

[0020] Figure 4 for Figure 2 A magnified view of a portion of the image;

[0021] Figure 5 This is a schematic diagram of the trigger in one embodiment of this application;

[0022] Figure 6 This is a schematic diagram of a locking button in one embodiment of this application.

[0023] Explanation of key figure labels:

[0024] 100-Cutting tool, 10-House, 11-First opening, 12-Air inlet, 13-Isolation part, 14-Limiting rib, 141-Second opening, 142-Fixing groove, 15-Bottom wall, 16-Side wall, 17-Grip part, 18-Limiting element, 181-Main body part, 182-Extension part, 183-Connecting part, 20-Trigger, 21-First contact surface, 22-Second contact surface, 23-Pressing surface, 24-Limiting part, 25-Restricted part, 30-Switch, 31-Pressing element, 40-Locking button, 41-Blocking part, 42-Pressing part, 50-Controller, 60-Driver, 70-Output shaft, 80-Reset spring. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0026] like Figure 1-3 As shown, a cutting tool 100 for preventing debris accumulation in one embodiment of this application includes a housing, a trigger 20, a drive member 60, and an output shaft 70. The housing has a grip portion 17 for the operator to hold, and for example includes two detachable housings 10 that are fastened together to form an internal mounting space for mounting the trigger 20 and the drive member 60, etc. This mounting space is divided into a first region and a second region, which are separated by an isolation portion 13. A first opening 11 and an air inlet 12 communicating with the first region are provided on the housing. The drive member 60 is disposed at one end of the grip portion 17 and is used to provide power. The output shaft 70 is connected to the drive member 60 and is used to mount working accessories (such as saw blades, saw shaving blades, etc.). The first opening 11 is opened at the end of the housing near the output shaft 70. The air inlet 12 is opened at the end of the grip portion 17 away from the output shaft 70, and a heat dissipation channel is formed between it and the first opening 11. The heat dissipation channel can be located within the first region. One end of the trigger 20 is pivotally connected to the housing, and the other end is a rotatable movable end. The trigger 20 is located in the second area and at least partially protrudes from the outside of the housing for the operator to press.

[0027] The cutting tool 100 in this embodiment is mainly a circular saw or similar cutting tool, primarily used for cutting sheet metal. The cutting tool 100 divides its internal installation space into a first area and a second area via an isolation section 13. The first area is used to secure the main electrical components, and the first opening 11 and the air inlet 12 are connected to the first area. During operation, the working attachment generates airflow between the first opening 11 and the air inlet 12 (flowing from the air inlet 12 towards the first opening 11) to dissipate heat and cool the internal components. Simultaneously, debris generated during operation may be drawn into the tool through the air inlet 12. In this embodiment, the air inlet 12 is located on the grip section 17 at the end furthest from the output shaft 70, keeping it as far away from the working area as possible to reduce the probability and amount of debris being drawn in. Even if debris is drawn in, it will flow out through the first opening 11 with the airflow, ensuring stable operation of the tool over a long period. The trigger 20, which controls the operation of the cutting tool 100, is located in the second region. Since the two regions are relatively independent and separated by the isolation part 13, the amount of debris sucked into the tool from the trigger 20 is reduced.

[0028] Each housing 10 includes a bottom wall 15 and a side wall 16 extending from the edge of the bottom wall 15. When the two housings 10 are mated and fixed, the two side walls 16 abut against each other. An opening is provided in one or both housings 10 for mounting a trigger 20.

[0029] A first contact surface 21 is provided at the movable end of the trigger 20. This first contact surface 21 is away from the connection end between the trigger 20 and the housing 10 and faces the side wall 16 on the housing 10. In order to reduce the gap between the trigger 20 and the housing 10, the curvature of the first contact surface 21 is configured to always be in contact with the side wall 16 when the trigger 20 is rotated, so as to reduce the probability and amount of sawdust entering the tool from this side.

[0030] In addition to the first contact surface 21, the trigger 20 also includes a pressing surface 23 connected to the first contact surface 21. This pressing surface protrudes from the housing 10 and is used by the operator for pressing. At the other end of the pressing surface 23 is a second contact surface 22, which is the contact surface between the trigger 20 and the other side wall 16. It extends in a direction away from the first contact surface 21. The curvature of the second contact surface 22 is also configured to always be in contact with the side wall 16 on the same side when the trigger 20 is rotated, so as to reduce the amount of sawdust flowing into the tool from this end.

[0031] Preferably, the trigger 20 can be configured such that all surfaces in contact with the housing 10 are flat, mainly the side area connecting the first contact surface 21 and the second contact surface 22. By making these two areas flat, the amount of sawdust entering the tool can be further reduced.

[0032] like Figure 2 , 3 As shown, the isolation section 13 includes a limiting rib 14, and a switch 30 is also provided inside the housing 10. The switch 30 is fixed to the bottom wall 15 of one of the housings 10. The switch 30 abuts against the limiting rib 14 and can form part of the isolation section 13. The trigger 20 squeezes and triggers the switch 30 when it rotates.

[0033] In one embodiment, a limiting portion 24 is provided on the trigger 20, which is located on one side of the pivot of the trigger 20. Correspondingly, a limiting member 18 is provided inside the housing on one side of the trigger 20, which is used to limit the rotation range of the trigger 20. When the switch is reset to the natural state, the limiting portion 24 abuts against the limiting member 18.

[0034] The switch 30 includes a push button 31 that abuts against the trigger 20. When the trigger 20 is pressed, the trigger 20 pushes the push button 31, thereby triggering the switch 30. The lever arm of the switch 30 is the distance from the push button 31 to the pivot of the trigger 20, while the lever arm of the limiting member 18 is the distance from the limiting member 18 to the pivot of the trigger 20. Preferably, the lever arm of the switch 30 is greater than the lever arm of the limiting member 18, so that the push button 31 provides a smaller force to make the trigger 20 rotate and return to its original position, thereby reducing the load on the switch 30.

[0035] During use, debris sucked into the gap between the trigger 20 and the housing will accumulate at the limiting part 18. The accumulated debris is not easy to clean. After long-term use, the accumulated debris will increase. Repeated pressing of the trigger 20 may even compact the debris into a cake shape, affecting the normal use of the tool and even causing a safety accident.

[0036] To address this, a second opening 141 connecting the first and second regions is provided on the limiting rib 14. When the working attachment is in operation, the airflow generated between the first opening 11 and the air inlet 12 is located within the first region, carrying away heat from the components within the mounting space. The second region is relatively enclosed, creating a pressure difference between the two regions. This allows debris flowing into the interior through the gap between the trigger 20 and the housing to be carried away by the airflow through the second opening 141, and finally flows out of the housing through the first opening 11. This prevents debris from accumulating at the limiting member 18, ensuring the tool operates normally for extended periods.

[0037] The limiting member 18 is disposed in the second region and includes a main body 181 and an extension 182 extending from the main body 181. The extension 182 is also provided with a connecting part 183 (the opening above the extension 182) communicating with the second opening 141. Debris flowing into the tool through the gap between the second mating surface 22 and the outer shell will be directly sucked out through the second opening 141, while debris flowing into the tool through the gap between the first mating surface 21 and the outer shell will be sucked out through the connecting part 183 and then through the second opening 141.

[0038] In one embodiment, the isolation part 13 includes a limiting rib 14 disposed on the inner wall of the outer shell, which connects the switch 30 and the side wall 16. A second opening 141 is opened on the limiting rib 14. The second opening 141 connects the heat dissipation duct and the second area. The size of the second opening 141 is moderate to avoid the situation where the suction is too weak and the sawdust cannot be sucked up normally.

[0039] Preferably, the second opening 141 is located at the position closest to the first opening 11 on the limiting rib 14 and faces the first opening 11, so that the wood chips can flow directly out of the first opening 11 without turning after being sucked out from the second opening 141, thereby avoiding the wood chips being blocked by other protruding structures (such as other protruding strips, ribs, etc.) on the inner wall of the outer shell, which would prevent them from being discharged normally and thus remain inside the tool.

[0040] For ease of use, the trigger 20 is typically located on the grip 17 near the output shaft 70 for easy holding and operation. Due to manufacturing limitations, a gap inevitably exists between the trigger 20 and the housing 10. One end of the trigger 20 is hinged to the housing 10, and the other end is at least partially housed within the housing 10. Therefore, when the trigger 20 is rotated, debris may enter the second area from the hinged end of the trigger 20. To address this, the second contact surface 22 is positioned close to the second opening 141, maximizing the suction force at the location of the second contact surface 22 to facilitate the removal of any wood chips that enter.

[0041] In one embodiment, a fixing groove 142 is also provided on the limiting rib 14, and a locking button 40 is provided in the fixing groove 142. A button hole (not shown) is provided on another housing 10, which corresponds to the fixing groove 142. The locking button 40 includes a pressing part 42 protruding from the button hole to the outside of the housing 10, and a return spring 80 is pressed between the housing 10 on the other side and the locking button 40. The locking button 40 also includes a blocking part 41 that prevents the trigger 20 from rotating, and a limiting part 25 is provided on the trigger 20. When the trigger 20 is in its natural state, the restricted part 25 abuts against the blocking part 41, preventing the trigger 20 from rotating. When the locking button 40 is pressed inward, the blocking part 41 disengages from the restricted part 25, allowing the trigger 20 to rotate freely without obstruction. The return spring 80 is compressed and deformed. After a single operation, the trigger 20 is released and the locking button 40 is no longer pressed. The return spring 80 returns to its original position and pushes the locking button 40 back to its original position. The restricted part 25 then abuts against the blocking part 41 again, preventing the trigger 20 from rotating. This locking button 40 is used to improve the overall safety of the cutting tool 100 and prevent safety problems caused by accidental triggering of the trigger 20.

[0042] like Figure 2 , 3 As shown, a controller 50 is fixed on the housing 10 and connected to the switch 30. The controller 50 controls the operation of the drive unit 70 according to the received signal from the switch 30. The controller 50 is located at the end of the grip 17 away from the output shaft 70, and is therefore located in the heat dissipation channel between the first opening 11 and the air inlet 12, where airflow can dissipate heat from it.

[0043] In one embodiment, the air inlet 12 is located on the side of the controller 50 to reduce the airflow being blocked by the controller 50 after entering the tool, which would weaken the airflow and affect the heat dissipation effect.

[0044] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cutting tool, characterized in that, include: The outer casing has a gripping portion (17) and an internal mounting space, which is divided into a first region and a second region by an isolation portion (13); A drive unit (60) is located at one end of the grip (17) and provides power; The output shaft (70) is connected to the drive unit (60) and is used to mount working accessories; as well as A trigger (20) is attached to the housing, and a portion of the trigger (20) is located in the second region and at least partially outside the housing; in The outer casing has a first opening (11) and an air inlet (12) that connect the first region. The first opening (11) is located at one end of the outer casing near the output shaft (70). The air inlet (12) is located at one end of the grip (17) away from the output shaft (70) and forms a heat dissipation channel with the first opening (11). The heat dissipation channel is located in the first region.

2. The cutting tool according to claim 1, characterized in that, The outer casing includes two detachably fixed housings (10), each housing (10) including a bottom wall (15) and a side wall (16) protruding from the edge of the bottom wall (15), the side walls (16) of the two housings (10) abutting each other, the movable end of the trigger (20) forming a first contact surface (21), the curvature of the first contact surface (21) being configured to contact the side wall (16) of the housing (10) when the trigger (20) is rotated; the trigger (20) includes a pressing surface (23) connected to the first contact surface (21), and a second contact surface (22) connected to the pressing surface (23) and extending in a direction away from the first contact surface (21), the curvature of the second contact surface (22) being configured to contact the side wall (16) of the housing (10) when the trigger (20) is rotated.

3. The cutting tool according to claim 2, characterized in that, The trigger (20) pivots within the housing. The isolation part (13) includes a limiting rib (14). A switch (30) is also provided inside the housing (10). The switch (30) is fixed to the bottom wall (15) of one of the housings (10). When the trigger (20) is pressed, the movable end of the trigger squeezes and triggers the switch (30).

4. The cutting tool according to claim 3, characterized in that, The trigger (20) has a limiting part (24), and a limiting member (18) is provided inside the housing on one side of the trigger (20). When the switch (30) returns to its natural state, the limiting part (24) abuts against the limiting member (18).

5. The cutting tool according to claim 4, characterized in that, The limiting rib (14) is provided with a second opening (141), which connects the first region and the second region.

6. The cutting tool according to claim 5, characterized in that, The limiting member (18) includes a main body (181) and an extension (182), and a connecting part (183) communicating with the second opening (141) is provided above the extension (182).

7. The cutting tool according to claim 5, characterized in that, The lever arm of the switch (30) is greater than the lever arm of the limiting member (18).

8. The cutting tool according to claim 3, characterized in that, A fixing groove (142) is provided on the limiting rib (14), and a locking button (40) is provided in the fixing groove (142). One of the housings (10) has a button hole at the fixing groove (142). The locking button (40) includes a pressing part (42) extending out of the housing through the button hole and a blocking part (41). A limiting part (25) is provided on the trigger. When the trigger (20) is in the natural state, the limiting part (25) abuts against the blocking part (41). When the pressing part (42) is triggered, the limiting part (25) can rotate freely. A return spring (80) is squeezed between the pressing part (42) and the other housing (10). When the locking button (40) is pressed, the blocking part (41) disengages from the trigger (20).

9. The cutting tool according to claim 2, characterized in that, It also includes a controller (50) fixed to the housing (10), the controller (50) being located at the end of the grip (17) away from the output shaft (70), and the controller (50) being located in the heat dissipation duct.

10. The cutting tool according to claim 9, characterized in that, The air inlet (12) is located on the side of the controller (50).

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