chain saw
By designing a combination structure of curved pressure surface and force transmission element on the chainsaw, the problem of requiring large force when locking the guide plate of the chainsaw is solved, achieving stable locking and easy unlocking of the guide plate, and improving the convenience and safety of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YOUWEI TECH (SUZHOU) CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-24
AI Technical Summary
Existing chainsaws require considerable force to lock the guide plate, and the knobs are difficult to loosen, leading to inconvenience and safety hazards.
A chainsaw was designed that uses a combination of curved pressure surface and force transmission element to reduce frictional resistance and make the knob easier to turn and lock the guide plate.
It achieves stable locking and easy unlocking of the guide plate, improving operational convenience and safety.
Smart Images
Figure CN224544819U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of outdoor power equipment, and more particularly to a chainsaw. Background Technology
[0002] A chainsaw, a wood-cutting tool, is a common type of outdoor power equipment (OPE). The saw chain, tensioned between the sprocket and the guide plate, serves as the cutting element. When installing the chainsaw, the knob must first be turned to loosen the lock on the guide plate, and then the guide plate is locked again after installation. For safety reasons, users often use considerable force to lock the guide plate. While this ensures safety, the force required to loosen the knob is usually greater than the force required to tighten it. Furthermore, the vibrations generated during chainsaw operation increase the engagement force between the knob and the threaded parts, making the knob difficult to loosen. Utility Model Content
[0003] This application provides a chainsaw that can stably lock the guide plate, and the user can easily release the locking of the guide plate.
[0004] Specifically, this application provides a chainsaw, including a housing, a power unit, a sprocket, a guide plate, and a saw chain. The power unit is disposed within the housing, and the sprocket is driven to rotate by the power unit. The saw chain is rotatably tensioned between the outer periphery of the guide plate and the sprocket, and moves with the rotation of the sprocket. The guide plate has a groove extending along its length. The chainsaw also includes a saw chain tensioning structure, which includes a knob, a locking element, and a force transmission element. The locking element is fixed to the housing and passes through the groove of the guide plate. The knob is rotatably mounted on the locking element, driving the force transmission element to move toward or away from the guide plate, causing the force transmission element to clamp or release the guide plate. The knob has an operating part and a pressing part, and the pressing part has a pressing surface that abuts against the force transmission element. The pressing surface is curved.
[0005] Furthermore, the pressure surface is wavy.
[0006] Furthermore, the pressing portion includes a first section and a second section, the first section being closer to the housing than the second section, the pressing surface being formed in the first section, and the thickness of the first section being less than the thickness of the second section.
[0007] Furthermore, in the direction toward the guide plate, the size of the first section is smaller than the size of the second section.
[0008] Furthermore, the thickness of the first section is not less than 1.5 mm.
[0009] Furthermore, the force transmission element is a cover plate, and when the knob rotates relative to the locking element, it also rotates relative to the cover plate.
[0010] Furthermore, the radial dimension of the operating part is larger than the radial dimension of the pressing part, and it partially protrudes from the pressing part and is suspended.
[0011] Furthermore, the knob also includes a connecting portion, which is connected to the housing via a locking element. The connecting portion extends in the same direction as the pressing portion and is located within the pressing portion.
[0012] In this application, by setting the pressing surface as a curved surface, the contact area between the pressing surface and the force transmission element is reduced, thereby reducing the frictional resistance between the pressing surface and the force transmission element. Even if the user obtains a reliable locking effect and uses a large force to tighten the guide plate, the knob can be turned off more easily to loosen the guide plate. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of a chainsaw according to an embodiment of this application.
[0014] Figure 2 yes Figure 1 A partial cross-sectional view of the chainsaw shown.
[0015] Figure 3 yes Figure 2 A magnified view of a section of the chainsaw shown.
[0016] Figure 4 yes Figure 1 A three-dimensional schematic diagram of one angle of the knob of the chainsaw shown. Detailed Implementation
[0017] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.
[0018] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper" and similar terms are for ease of description only and are not limited to a location or spatial orientation. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "linked" and similar terms are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.
[0019] Please combine Figures 1 to 4 This application provides a chainsaw, including a housing 1, a power unit (not shown), a sprocket 2, a guide plate 3, a saw chain 4, and a saw chain tensioning structure 5. The sprocket 2 is driven to rotate by the power unit, and the saw chain 4 is rotatably tensioned between the outer periphery of the guide plate 3 and the sprocket 2, moving with the rotation of the sprocket 2. Optionally, the power unit may be, for example, an electric motor or a gasoline engine; the power unit can directly drive the sprocket, or it can drive the sprocket through a reduction gear.
[0020] The saw chain tensioning structure 5 is used to tension the saw chain 4. Specifically, the saw chain tensioning structure 5 achieves tensioning and loosening of the saw chain by clamping or releasing the guide plate. The saw chain tensioning structure 5 includes a knob 51, a locking element 52, and a force transmission element 53. The guide plate 3 is provided with a groove 31. The locking element 52 is fixed to the housing 1 and passes through the groove 31 of the guide plate 5. The knob 51 is rotatably mounted on the locking element 52, driving the force transmission element 53 to move toward or away from the guide plate 3, so that the force transmission element 53 clamps or releases the guide plate 3.
[0021] The knob 51 has an operating part 511 and a pressing part 512. The pressing part 512 has a pressing surface 513 that abuts against the force transmission element. The pressing surface 5120 is curved, thereby reducing the contact area between the pressing surface 5120 and the force transmission element 53, and thus reducing the frictional resistance between the pressing surface 5120 and the force transmission element 53. Even if the user uses a large force to tighten the guide plate 3 to obtain a reliable locking effect, the knob can be easily turned off and the guide plate 3 can be loosened. Preferably, the pressing surface 5120 is wavy, which makes the rotation of the knob 51 more stable and provides a good operating feel.
[0022] The pressing part 512 includes a first segment 5121 and a second segment 5122. The first segment 5121 is closer to the housing 1 than the second segment 5122. The pressing surface 5120 is formed in the first segment 5121, and the thickness of the first segment 5121 is less than the thickness of the second segment 5122. It is easy to understand that the first segment 5121, located at the end of the pressing part 512, has a smaller thickness, which further increases its elasticity, allowing the user to unscrew the knob 51 with less force. However, if the thickness of the first segment 5121 is too small, the strength of the pressing part 512 will be significantly reduced, preventing the guide plate 4 from locking effectively and potentially causing a serious safety accident where the saw chain 4 flies out. Therefore, preferably, the thickness of the first segment is not less than 1.5 mm, ensuring strength while allowing the pressing surface 5120 to have slight elasticity. More preferably, in the direction towards the guide plate 3, the size of the first segment 5121 is smaller than the size of the second segment 5122.
[0023] In this embodiment, the force transmission element 53 is a cover plate, and the knob 51 rotates relative to the locking element 52, and also rotates relative to the cover plate. The knob 5 also includes a connecting part 54, and the connecting part 513 is connected to the housing 1 through the locking element 52. The connecting part 513 and the pressing part 512 both extend from the operating part 511 in the same direction, and the connecting part 513 is located inside the pressing part 512. The radial dimension of the operating part 511 is larger than the radial dimension of the pressing part 512, and partly protrudes from the pressing part 512 and is suspended. That is to say, the operating part 511 provides a larger operating area, which is convenient for the user to operate.
[0024] When the user needs to replace the saw chain, rotate the knob 51 counterclockwise. The pressing surface 5120 of the knob 51 releases the pressure on the force transmission element 53, thereby releasing the locking of the force transmission element 53 onto the guide plate 3. This allows the guide plate to slide relative to the locking element 52 through the slide groove 31, after which the saw chain can be disassembled. After the saw chain is replaced, slide the guide plate 3 again. After sliding it into place, rotate the knob 51 clockwise to lock the guide plate 3 and the saw chain.
[0025] In this application, by setting the pressing surface as a curved surface, the contact area between the pressing surface and the force transmission element is reduced, thereby reducing the frictional resistance between the pressing surface and the force transmission element. Even if the user obtains a reliable locking effect and uses a large force to tighten the guide plate, the knob can be turned off more easily to loosen the guide plate.
[0026] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has disclosed the preferred embodiment as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.
Claims
1. A chainsaw, comprising a housing, a power unit, a sprocket, a guide plate, and a saw chain, wherein the power unit is disposed within the housing, the sprocket is driven to rotate by the power unit, the saw chain is rotatably tensioned between the outer periphery of the guide plate and the sprocket, and moves with the rotation of the sprocket, and the guide plate is provided with a groove extending along its length, characterized in that, The chainsaw also includes a chainsaw tensioning structure, which includes a knob, a locking element, and a force transmission element. The locking element is fixed to the housing and passes through a groove in the guide plate. The knob is rotatably mounted on the locking element, driving the force transmission element to move toward or away from the guide plate, causing the force transmission element to clamp or release the guide plate. The knob has an operating part and a pressing part. The pressing part has a pressing surface that abuts against the force transmission element, and the pressing surface is curved.
2. The chainsaw according to claim 1, characterized in that, The pressure surface is wavy.
3. The chainsaw according to claim 1, characterized in that, The pressing part includes a first section and a second section, the first section being closer to the shell than the second section, the pressing surface being formed in the first section, and the thickness of the first section being less than the thickness of the second section.
4. The chainsaw according to claim 3, characterized in that, In the direction toward the guide plate, the size of the first section is smaller than the size of the second section.
5. The chainsaw according to claim 3, characterized in that, The thickness of the first section is not less than 1.5 mm.
6. The chainsaw according to claim 1, characterized in that, The force transmission element is a cover plate, and when the knob rotates relative to the locking element, it also rotates relative to the cover plate.
7. The chainsaw according to claim 6, characterized in that, The radial dimension of the operating part is larger than the radial dimension of the pressing part, and it partially protrudes from the pressing part and is suspended.
8. The chainsaw according to claim 1, characterized in that, The knob also includes a connecting part, which is connected to the housing via a locking element. The connecting part extends in the same direction as the pressing part and is located inside the pressing part.