Chain saw
By designing a brake device including a brake baffle, a brake force arm, a brake switch and a limiting device, the problem of complex structure and insufficient durability of the existing chain saw brake devices is solved, and a longer service life and higher brake effectiveness are achieved.
Patent Information
- Application Number
- CN202421240858.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The brake devices of existing chain saws are complex in structure and lack durability, resulting in short brake force arms, large obstacles in position limit devices, shortened service life, and poor electronic brake performance at high speeds.
A brake device is designed, including a brake baffle that can rotate about a central axis, a coaxially rotating brake force arm, a brake switch fixed to the housing, and a limiting device that cooperates with the brake force arm. The limiting device and brake switch are located within the sweeping area of the brake force arm, extending the length of the brake force arm, simplifying the structure and optimizing the internal layout.
It extends the service life of the limiting device, simplifies the structure of the brake device, optimizes the internal layout of the chain saw, and improves the effectiveness and safety of the brakes.
Smart Images
Figure CN222609894U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a chain saw, in particular to a chain saw with a brake device having a simple structure and high durability. Background Art
[0002] At present, garden tools have been widely used in households, gardens and other fields. Chain saws are a relatively common garden tool. The chain is driven by a power device to rotate around a guide plate to cut wood or branches. However, when the chain saw cuts a harder object during operation, the chain saw will rebound in the direction of the operator's body. Therefore, the chain saw must be braked urgently to stop the movement of the chain saw in a short time to prevent the chain saw from injuring the operator.
[0003] Existing braking methods for chainsaws include mechanical brakes and electronic brakes. Currently, the brake arm of the mechanical brake is relatively short, which will increase the resistance of the limit device and shorten the service life of the parts. Secondly, it will increase the material requirements for the brake baffle and increase the cost. In addition, the brake arm of the mechanical brake needs to be coordinated with the brake switch and the limit device respectively, the structure is relatively complex, and it will increase the overall weight of the chain saw. The existing electronic brake is mainly used for chain saws with low rotation speeds, and often cannot meet the requirements at high speeds.
[0004] In view of the above problems, it is necessary to provide a chain saw with a brake device having a simple structure and high durability to overcome the defects of the prior art. Utility Model Content
[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a chain saw with a brake device having a simple structure and high durability.
[0006] The technical solution adopted by the utility model to solve the problems of the prior art is: a chain saw, including a shell and a brake device, the brake device including a brake baffle that can rotate relative to the shell around a central axis, a brake lever arm that rotates coaxially with the brake baffle, a brake switch fixed to the shell and a limit device that cooperates with the brake lever arm, the limit device limits the brake lever arm from rotating around the central axis between a first position and a second position, and at least one of the limit device and the brake switch is located within a swept area when the brake lever arm rotates from the first position to the second position.
[0007] A further improved solution is: the brake switch is located between the limit device and the central axis.
[0008] A further improved solution is: the brake arm includes a braking part cooperating with the brake switch and a limiting part cooperating with the limiting device, and the limiting part and the braking part are arranged on the same side of the brake arm or respectively on opposite sides of the brake arm.
[0009] A further improved solution is that the braking portion and the limiting portion are configured as protrusions extending from the brake arm along the direction of the central axis.
[0010] A further improved solution is: the limiting device is located between the limiting portion and the braking portion, and the limiting device is configured as a leaf spring structure.
[0011] A further improvement is that the limiting portion includes a first matching portion abutting against the limiting device in the first position and a second matching portion abutting against the limiting device in the second position, and the limiting device includes a first contact portion matching with the first matching portion and a second contact portion matching with the second matching portion.
[0012] A further improvement is that the brake switch is arranged obliquely between the braking part and the central axis.
[0013] A further improved solution is: the brake switch includes an elastic sheet matched with the braking part and a triggering part extending from the elastic sheet, and there is a preset distance between the braking part and the triggering part.
[0014] A further improvement is as follows: the chain saw includes a fixing column integrally formed or connected to the shell, the brake device includes a fixing hole located between the brake baffle and the brake arm, the fixing column passes through the fixing hole to enable the brake baffle to be rotatably connected to the shell, and the brake baffle and the brake arm are located in different planes.
[0015] A further improvement is that the fixing column, the brake switch and the limiting device are approximately located in a straight line.
[0016] Compared with the prior art, the utility model has the following beneficial effects: at least one of the limit device and the brake switch is located within the swept area of the brake lever arm, which extends the length of the brake lever arm, thereby reducing the force acting on the limit device, thereby extending the service life of the limit device. The brake switch and the limit device are approximately located in a straight line, respectively cooperating with the positions corresponding to the brake lever arm, simplifying the structure of the brake device and optimizing the internal layout of the chain saw. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings:
[0018] Figure 1 This is a structural schematic diagram of a chain saw brake device in a first position according to a preferred embodiment of the utility model;
[0019] Figure 2 for Figure 1 The brake device of the chain saw is shown in a second position;
[0020] Figure 3 for Figure 1 A schematic structural diagram of a brake device of a chain saw shown;
[0021] Figure 4 for Figure 1 The schematic diagram of the structure of the chain saw without the brake device shown;
[0022] Meaning of the reference numerals in the figures:
[0023] Chain saw 100 Central axis 101
[0024] Housing 10 Fixing column 11
[0025] Positioning groove 12 Braking device 20
[0026] Brake baffle 21 fixing hole 211
[0027] Brake arm 22 Brake switch 23
[0028] Elastic sheet 231 Triggering portion 232
[0029] Limiting device 24 First contact portion 241
[0030] Second contact portion 242 Braking portion 25
[0031] Limiting portion 26 First matching portion 261
[0032] The second matching portion 262 DETAILED DESCRIPTION
[0033] The present invention is further described in detail below with reference to the accompanying drawings and implementation modes.
[0034] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the words "upper", "lower", "front", "back", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.
[0035] See also Figure 1As shown, a preferred embodiment of the utility model relates to a chain saw 100, the chain saw 100 includes a housing 10 and a brake device 20, the brake device 20 includes a brake baffle 21 that can rotate relative to the housing 10 around a central axis 101, a brake arm 22 that rotates coaxially with the brake baffle 21, a brake switch 23 fixed to the housing 10, and a limit device 24 that cooperates with the brake arm 22. The brake baffle 21 is protruding from the housing 10, and the brake baffle 21 is higher than the main handle of the chain saw 100. When a user encounters an emergency such as a severe collision during use of the chain saw, the brake baffle 21 can be quickly operated to achieve mechanical braking of the chain saw, thereby improving the user's safety.
[0036] See also Figure 1 to Figure 2 As shown, the limiting device 24 limits the brake arm 22 around the central axis 101. Figure 1 The first position shown and Figure 2 When the stopper 24 is in the second position, Figure 1 When the brake baffle 21 is in the first position shown in FIG. 1 , the brake switch 23 is in the off state, and the chain saw 100 is in a normal working state; when the brake baffle 21 is rotated clockwise, the limit device 24 is in the Figure 2 In the second position, the brake baffle 21 triggers the brake switch 23, and the brake switch 23 is in an on state. At this time, the chain saw 100 is in a brake protection state.
[0037] See also Figure 3 As shown, at least one of the limit device 24 and the brake switch 23 is located within the swept area of the brake arm 22 when it rotates from the first position to the second position, and the brake switch 23 is located between the limit device 24 and the central axis 101. When the brake arm 22 is in the first position or the second position, the distance between the brake switch 23 and the central axis 101 is always less than the distance between the limit device 24 and the central axis 101, and when the brake baffle 21 is rotated for braking protection or normal operation, the brake switch 23 can be quickly turned on or off. In addition, by arranging the limit device at a position away from the central axis, the distance between the limit device and the central axis 101 is substantially the same as the length of the entire brake baffle 21, and the length of the force arm corresponding to the limit device 24 is extended to a certain extent, so that the force acting on the brake baffle 21 is substantially the same as the force acting on the limit device 24, and the service life of the limit device is extended.
[0038] See also Figure 3As shown, the brake arm 22 includes a brake portion 25 that cooperates with the brake switch 23 and a limit portion 26 that cooperates with the limit device 24. The limit portion 26 and the brake portion 24 are arranged on the same side of the brake arm 22 or on opposite sides of the brake arm 22. The brake portion 25 is used to cooperate with the brake switch 23 to realize the on and off state of the brake switch 23, thereby realizing the opening and closing of the brake of the chain saw 100, and the limit portion 26 is used to cooperate with the limit device 24 to realize two different positions of the limit device.
[0039] The braking part 24 and the limiting part 26 are formed as protrusions extending from the brake arm 22 along the direction of the central axis 101. The limiting device 24 is located between the limiting part 26 and the braking part 24. The limiting device 24 is formed as a leaf spring structure, and the elastic deformation of the leaf spring structure is used to realize the rotation force of the brake baffle 21. Figure 4 As shown, the housing 10 is provided with a plurality of positioning grooves 12, and the positioning grooves 12 are used to fix the limiting device 24, so as to limit the movement of the limiting device 24 in the housing 10. In addition, the limiting is performed by the positioning grooves 12, which is different from the conventional method of fixing the limiting device 24 with screws, and simplifies the installation process of the chain saw 100 to a certain extent and reduces the cost.
[0040] See also Figures 1 to 3 As shown, the limiting portion 26 includes a first matching portion 261 that abuts against the limiting device 24 in the first position and a second matching portion 262 that abuts against the limiting device 24 in the second position. The limiting device 24 includes a first contact portion 241 that matches with the first matching portion 261 and a second contact portion 242 that matches with the second matching portion 262. Figure 1 As shown, when the brake device 20 is in the first position, the first contact portion 241 of the limiting device 24 abuts against the first matching portion 261 of the limiting portion 26; see Figure 2 As shown, when the brake device 20 is in the second position, the second contact portion 242 of the limiting device 24 abuts against the second matching portion 262 of the limiting portion 26 .
[0041] See also Figure 3 to Figure 4As shown, the brake switch 23 is obliquely arranged between the brake portion 25 and the central axis 101. The oblique arrangement here means that the extension direction of the brake switch intersects with the extension direction of the brake arm and the angle formed between the two is less than 90°. By obliquely arranging the brake switch 23 in the housing 10, on the one hand, when the brake baffle 21 is rotated, the brake baffle 21 can realize the braking function of the chain saw 100 within a shorter stroke, ensuring the safety of the user when using the chain saw 100; on the other hand, the oblique arrangement of the brake switch 23 enlarges the internal space of the housing 10, facilitates the reasonable arrangement of other components, improves the utilization rate of the internal space of the housing 10, and also reduces the overall size of the chain saw 100 to a certain extent.
[0042] See also Figure 3 As shown, the brake switch 23 includes an elastic sheet 231 matched with the brake part 25 and a trigger part 232 extending from the elastic sheet 231, wherein the trigger part 232 is configured in an arc shape, and the elastic sheet 231 is disposed between the brake switch 23 and the brake part 25. When the brake baffle 21 is in the first position, there is a certain preset distance between the brake part 25 and the trigger part 232. When the brake baffle 21 is rotated to the second position, the trigger part 232 is easy to contact with the brake part 25 under the action of the elastic sheet 231, thereby realizing the on state of the brake switch 23.
[0043] See also Figures 1 to 4 As shown, the chain saw 100 includes a fixing column 11 integrally formed or connected with the housing 10, and the brake device 20 includes a fixing hole 211 located between the brake baffle 21 and the brake arm 22. The fixing column 11 passes through the fixing hole 211 to rotatably connect the brake baffle 21 to the housing 10, and the brake baffle 21 and the brake arm 22 are located in different planes. By arranging the fixing column 11 on the housing 10 to cooperate with the fixing hole 211, on the one hand, the brake baffle 21 can realize the rotation function, and on the other hand, it is different from the previous method of rotating around a metal cylindrical pin, which significantly reduces the weight of the chain saw 100 and reduces the cost.
[0044] The fixed column 11, the brake switch 23 and the limit device 24 are roughly located in a straight line. The "roughly located in a straight line" mentioned here means that the fixed column 11, the brake switch 23, the limit device 24 at least partially intersect with the central axis 101 and the connecting line of the center point of the end of the brake arm 22 on the side away from the brake baffle, that is, the connecting line of the central axis and the center point of the free end of the brake arm passes through the fixed column, the brake switch and the limit device in sequence; such an arrangement can make the action points of the brake arm and the brake switch, and the action points of the brake arm and the limit device roughly located in a straight line, reduce the action force and reaction force between the brake arm and the brake switch, and the limit device, thereby extending the service life of the brake device.
[0045] The brake switch 23 is close to the fixing column 11 and is arranged obliquely, and the limit device 24 is located below the brake switch 23. By reasonably arranging the positions of the brake switch 23 and the limit device 24, on the one hand, the internal layout of the chain saw 100 can be optimized to make the parts arrangement more coordinated, and on the other hand, the internal structure of the chain saw 100 can be made more compact, the overall size of the chain saw 100 can be shortened, and the miniaturization of the chain saw can be achieved.
[0046] The utility model is not limited to the above specific implementations. Those skilled in the art can easily understand that there are many alternatives to the chain saw of the utility model without departing from the principle and scope of the utility model. The protection scope of the utility model shall be based on the content of the claims.
Claims
1. A chain saw, comprising a housing and a brake device, wherein the brake device comprises a brake baffle plate rotatable relative to the housing about a central axis, a brake arm coaxially rotatable with the brake baffle plate, a brake switch fixed to the housing, and a limit device cooperating with the brake arm, wherein: The limit device limits the brake arm from rotating around the central axis between a first position and a second position, and at least one of the limit device and the brake switch is located within a swept area of the brake arm rotating from the first position to the second position.
2. The chain saw according to claim 1, characterized in that: The brake switch is located between the limit device and the central axis.
3. The chain saw according to claim 2, characterized in that: The brake lever arm comprises a brake portion cooperating with the brake switch and a limit portion cooperating with the limit device. The limit portion and the brake portion are arranged on the same side of the brake lever arm or respectively on two opposite sides of the brake lever arm.
4. The chain saw according to claim 3, characterized in that: The braking portion and the limiting portion are configured as protrusions extending from the brake arm along the direction of the central axis.
5. The chain saw according to claim 3, characterized in that: The limiting device is located between the limiting portion and the braking portion, and the limiting device is configured as a leaf spring structure.
6. The chain saw according to claim 5, characterized in that: The limiting portion includes a first matching portion abutting against the limiting device in the first position and a second matching portion abutting against the limiting device in the second position, and the limiting device includes a first contact portion matching with the first matching portion and a second contact portion matching with the second matching portion.
7. The chain saw according to claim 3, characterized in that: The brake switch is obliquely arranged between the braking portion and the central axis.
8. The chain saw according to claim 7, characterized in that: The brake switch comprises an elastic sheet matched with the braking part and a triggering part extending from the elastic sheet, and a preset distance is provided between the braking part and the triggering part.
9. The chain saw according to claim 1, characterized in that: The chain saw includes a fixing column integrally formed or connected to the shell, the brake device includes a fixing hole located between the brake baffle and the brake arm, the fixing column passes through the fixing hole to enable the brake baffle to be rotatably connected to the shell, and the brake baffle and the brake arm are located in different planes.
10. The chain saw according to claim 9, characterized in that: The fixing column, the brake switch and the limiting device are approximately located in a straight line.