A dual protection structure to prevent chainsaw cable from coming loose

Abstract

This utility model relates to the field of chainsaw technology, and in particular to a dual-protection structure to prevent the chainsaw pull rope from detaching. It includes a starter cover with an overall box-like structure and an open side. Inside the starter cover, a starter disc and a starter ratchet are stacked from the inside out. The bottom surface of the starter cover has an outwardly extending mounting post, the outer end of which is sequentially inserted into a first mounting hole and a second mounting hole on the starter disc and the starter ratchet. A limiting structure is provided on the outer section of the mounting post to prevent the starter disc and the starter ratchet from detaching from the outer section of the mounting post. Furthermore, the side of the starter disc opposite the starter ratchet has an annular mounting cavity on which a spiral spring is installed, with its two connecting ends connected to the starter disc and the starter ratchet respectively. This utility model has the advantages of better installation and limiting of each component, and better protection of each component.

Description

Technical Field

[0001] This utility model relates to the field of chainsaw technology, and in particular to a dual protection structure to prevent the chainsaw pull rope from coming off. Background Technology

[0002] Most chainsaws on the market are started by pulling a starter disc, which is equipped with a spiral spring. The spiral spring drives the starter ratchet, which in turn drives the flywheel pawl. Once the speed of the manual starter exceeds the minimum ignition speed of the flywheel, the engine can be ignited and put into operation.

[0003] Common structures in existing technologies, such as Figure 1 As shown, its structure includes a starter handle 1, a starter cover 2, a return spring 3, a return spring protective cover 4, a starter rope 5, a starter disc 6, a spiral spring 7, a starter ratchet 8, a ratchet fixing washer 9, and a fixing screw 10. The starter cover is used for mounting on the chainsaw engine. An outwardly protruding mounting post is provided on the bottom surface inside the starter cover. The starter disc is rotatably mounted on the mounting post. A return spring and a return spring protective cover are installed between the starter disc and the bottom surface inside the starter cover, with both ends of the return spring connected to the starter cover and the starter disc, respectively. A starter ratchet is installed on the outside of the starter disc. A spiral spring is installed between the starter ratchet and the starter disc, with both ends of the spiral spring connected to the starter ratchet and the starter disc, respectively. The starter ratchet is mounted on the mounting post via a ratchet fixing washer and a fixing screw. The inner end of the starter rope is connected to the starter disc, and the other end is connected to the starter handle. When in operation, pull the start rope to rotate the starter disc. The starter disc starts the ratchet to rotate through the spiral spring. When the operator quickly pulls the starter handle, the speed is sufficient to drive the flywheel to ignite, and the chainsaw can start working normally.

[0004] However, the following problems exist in actual operation: 1. During use, because the scroll spring has no limiting parts or limiting structure, the axial position of the scroll spring will gradually shift with the increase of the number of uses. After the scroll spring moves to a certain extent, it will rub against the starting ratchet, which will make the return of the starting pull rope not smooth. In some cases, it may even directly cause the pull rope to fall off or be cut by the flywheel pawl; 2. When resetting, because there is no limiting structure for the starting pull rope, the force can easily penetrate into other areas of the starter cover, and it is easy to wrap around other components and be damaged.

[0005] Therefore, how to provide a dual-protection structure that is simpler and more reasonable in its structural design, can better limit the installation of each component, and better protect each component to prevent the chainsaw rope from coming off has become a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this utility model is how to provide a dual protection structure that has a simpler and more reasonable structural design, can better limit the installation of each component, and better protect each component to prevent the chainsaw rope from coming off.

[0007] To achieve the above objectives, this utility model provides a dual protection structure to prevent the chainsaw pull rope from detaching. It includes a starter cover with an overall box-like structure and an open side. Inside the starter cover, a starter disc and a starter ratchet are stacked from the inside out. The bottom surface of the starter cover has an outwardly extending mounting post, with the outer end of the mounting post sequentially inserted into a first mounting hole and a second mounting hole on the starter disc and the starter ratchet. A limiting structure is provided on the outer section of the mounting post to prevent the starter disc and the starter ratchet from detaching from the outer section of the mounting post. Furthermore, the side of the starter disc opposite the starter ratchet has an annular mounting cavity on which a spiral spring is mounted, with its two connecting ends connected to the starter disc and the starter ratchet respectively. The feature is that multiple inwardly protruding limiting protrusions are evenly arranged on the outer end of the inner peripheral wall of the mounting cavity to prevent the spiral spring from moving outward beyond the outer end of the mounting cavity.

[0008] In this structure, multiple inwardly protruding limiting protrusions are evenly arranged on the outer end of the inner peripheral wall of the mounting cavity on the starter plate. These limiting protrusions restrict the spiral spring from moving outward to the outside of the mounting cavity. During operation, this better prevents the spiral spring from contacting the inner end of the starter ratchet and causing friction and interference, ensuring smooth return of the starter pull rope and protecting the starter pull rope, starter plate, spiral spring, and starter ratchet.

[0009] As an optimization, the limiting protrusion is designed with a long strip shape and is bent into an arc shape along the inner contour of the mounting cavity.

[0010] In this way, the structural design of the limiting protrusion is simpler and more reasonable.

[0011] As an optimization, the limiting protrusion and the starter disk are integrally formed.

[0012] This results in better integration and makes processing and manufacturing easier.

[0013] As an optimization, the limiting protrusions are four that are evenly distributed along the circumference.

[0014] In this way, the number of limiting protrusions is designed more reasonably, which can better limit the spiral spring.

[0015] As an optimization, the circumferential diameter formed by the inner contour of the limiting protrusion is set to be larger than the outer contour diameter of the starting ratchet.

[0016] This better avoids friction and interference between the moving ratchet and the limiting protrusion due to external force deviation.

[0017] As an optimization, the limiting structure includes a ratchet fixing washer disposed outside the second mounting hole of the starting ratchet, and a fixing screw is disposed inside the ratchet fixing washer, such that the fixing screw is threadedly connected to the threaded hole on the outer end face of the mounting post.

[0018] In this way, by setting ratchet fixing shims and fixing screws, the limit structure design is made simpler and easier to disassemble and assemble.

[0019] As an optimization, it also includes a return spring sleeved on the inner end of the mounting post and located between the inner side of the starter plate and the inner bottom surface of the starter cover. The two connecting ends of the return spring are respectively connected to the starter cover and the starter plate. A return spring protective cover with an overall circular box structure and an open inner side is also provided on the outside of the return spring, so that the mounting post passes through and fits into the clearance hole of the return spring protective cover. It also includes a starter pull rope wrapped around the outer circumference of the starter plate. One end of the starter pull rope is connected and fixed to the starter plate, and the other end of the starter pull rope passes through a through hole on the starter cover and is connected to the starter handle.

[0020] In this way, during operation, pulling the starter rope with the starter handle rotates the starter disc, which in turn drives the starter ratchet to rotate via a spiral spring. After starting, the return spring resets the starter disc and winds the starter rope around it. The return spring's protective cover limits its movement and prevents frictional contact with the outer starter disc. The overall design is simpler and more rational.

[0021] As an optimization, a ring-shaped retaining plate with a protruding structure is provided on the outer peripheral surface of both ends of the starter disk, so that the starter pull rope is wrapped and positioned between the two retaining ring plates.

[0022] In this way, by setting two retaining ring plates, the starting pull rope can be better wound around the starting plate.

[0023] Furthermore, the retaining ring plate and the starter disc are integrally formed.

[0024] As an optimization, multiple limiting posts are provided on the bottom surface inside the starter cover and on the outer circumferential surface of the spacer ring plate, arranged at intervals along the circumferential direction.

[0025] In this way, by setting a limit post, the starting pull rope can be limited, which better prevents the starting pull rope from intruding into other areas of the starter cover and from getting tangled in other components and being damaged.

[0026] Furthermore, the limiting posts are four in number, arranged at intervals along the circumference.

[0027] As an optimization, the starter cover is provided with four mounting holes for mounting screws, so that the mounting screws can mate with the mounting screw holes on the chainsaw engine, and the starter cover is mounted and fixed on the chainsaw engine.

[0028] This makes the starter cover easier to install and remove.

[0029] In summary, the above structure features a simpler and more reasonable structural design, better installation and positioning of each component, and better protection for each component. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure in the prior art.

[0031] Figure 2 This is a schematic diagram of the dual protection structure for preventing the chainsaw pull rope from coming off in a specific embodiment of this utility model.

[0032] Figure 3 yes Figure 2 A magnified view of position A in the diagram.

[0033] Figure 4 yes Figure 2 BB cross-sectional diagram.

[0034] Figure 5 yes Figure 4 A magnified view of position C in the diagram. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] like Figures 2 to 5As shown, a dual protection structure to prevent chainsaw pull rope from detaching includes a starter cover 11 with an overall box-like design and an open side. Inside the starter cover, a starter disc 12 and a starter ratchet 13 are stacked from the inside to the outside. The bottom surface inside the starter cover has an outwardly extending mounting post 14, with the outer end of the mounting post sequentially inserted into the first mounting hole and the second mounting hole of the starter disc and the starter ratchet. A limiting structure is provided on the outer section of the mounting post to prevent the starter disc and the starter ratchet from detaching from the outer section of the mounting post. The side of the starter disc opposite to the starter ratchet has an annular mounting cavity on which a spiral spring 15 is installed, with the two connecting ends of the spiral spring connected to the starter disc and the starter ratchet respectively. Multiple inwardly protruding limiting protrusions 16 are evenly arranged on the outer end of the inner peripheral wall of the mounting cavity to prevent the spiral spring from moving outward to the outside of the mounting cavity.

[0037] In this structure, multiple inwardly protruding limiting protrusions are evenly arranged on the outer end of the inner peripheral wall of the mounting cavity on the starter plate. These limiting protrusions restrict the spiral spring from moving outward to the outside of the mounting cavity. During operation, this better prevents the spiral spring from contacting the inner end of the starter ratchet and causing friction and interference, ensuring smooth return of the starter pull rope and protecting the starter pull rope, starter plate, spiral spring, and starter ratchet.

[0038] In this specific embodiment, the limiting protrusion is designed as a long strip and is bent into an arc shape along the inner contour of the mounting cavity.

[0039] In this way, the structural design of the limiting protrusion is simpler and more reasonable.

[0040] In this specific embodiment, the limiting protrusion and the starter disk are integrally formed.

[0041] This results in better integration and makes processing and manufacturing easier.

[0042] In this specific embodiment, the limiting protrusions are four that are evenly distributed along the circumference.

[0043] In this way, the number of limiting protrusions is designed more reasonably, which can better limit the spiral spring.

[0044] In this specific embodiment, the circumferential diameter formed by the inner contour of the limiting protrusion is set to be larger than the outer contour diameter of the starting ratchet.

[0045] This better avoids friction and interference between the moving ratchet and the limiting protrusion due to external force deviation.

[0046] In this specific embodiment, the limiting structure includes a ratchet fixing washer 17 disposed outside the second mounting hole of the starting ratchet, and a fixing screw 18 disposed inside the ratchet fixing washer, such that the fixing screw is threadedly connected to the threaded hole on the outer end face of the mounting post.

[0047] In this way, by setting ratchet fixing shims and fixing screws, the limit structure design is made simpler and easier to disassemble and assemble.

[0048] In this specific embodiment, it also includes a return spring 19 sleeved on the inner end of the mounting post and located between the inner side of the starter plate and the inner bottom surface of the starter cover. The two connecting ends of the return spring are respectively connected to the starter cover and the starter plate. A return spring protective cover 20 with an overall circular box structure and an open inner side is also provided on the outside of the return spring, so that the mounting post is inserted into the clearance hole of the return spring protective cover. It also includes a starter pull rope 21 wound on the outer circumference of the starter plate. One end of the starter pull rope is connected and fixed to the starter plate, and the other end of the starter pull rope passes through the through hole on the starter cover and is connected to the starter handle 22.

[0049] In this way, during operation, pulling the starter rope with the starter handle rotates the starter disc, which in turn drives the starter ratchet to rotate via a spiral spring. After starting, the return spring resets the starter disc and winds the starter rope around it. The return spring's protective cover limits its movement and prevents frictional contact with the outer starter disc. The overall design is simpler and more rational.

[0050] In this specific embodiment, a ring-shaped retaining plate 23 with a ring structure protrudes from the outer peripheral surface of each end of the starter disk, and the starter pull rope is wound and disposed between the two retaining plates.

[0051] In this way, by setting two retaining ring plates, the starting pull rope can be better wound around the starting plate.

[0052] Furthermore, the retaining ring plate and the starter disc are integrally formed.

[0053] Furthermore, multiple heat dissipation holes 24 are provided on the baffle plate at intervals along the circumference, which is more conducive to heat dissipation.

[0054] In this specific embodiment, a plurality of limiting posts 25 are provided on the bottom surface inside the starter cover and on the outer peripheral surface of the spacer ring plate, arranged at intervals along the circumferential direction.

[0055] In this way, by setting a limit post, the starting pull rope can be limited, which better prevents the starting pull rope from intruding into other areas of the starter cover and from getting tangled in other components and being damaged.

[0056] Furthermore, the limiting posts are four in number, arranged at intervals along the circumference.

[0057] In this specific embodiment, the starter cover is provided with four mounting holes 26 for arranging mounting screws, so that the mounting screws can cooperate with the mounting screw holes on the chainsaw engine, and the starter cover is mounted and fixed on the chainsaw engine.

[0058] This makes the starter cover easier to install and remove.

[0059] In summary, the above structure features a simpler and more reasonable structural design, better installation and positioning of each component, and better protection for each component.

[0060] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A dual-protection structure for preventing chainsaw pull rope detachment, comprising a starter cover with an overall box-like structure and an open side, wherein a starter disc and a starter ratchet are stacked inside the starter cover from the inside out, the bottom surface of the starter cover has an outwardly extending mounting post, such that the outer end of the mounting post is sequentially inserted into a first mounting hole and a second mounting hole of the starter disc and the starter ratchet, a limit structure is provided on the outer section of the mounting post to prevent the starter disc and the starter ratchet from detaching from the outer section of the mounting post; and the side of the starter disc opposite to the starter ratchet has an annular mounting cavity on which a spiral spring is mounted, such that the two connecting ends of the spiral spring are respectively connected to the starter disc and the starter ratchet; characterized in that; Multiple inwardly protruding limiting blocks are evenly arranged on the outer end of the inner peripheral wall of the mounting cavity to restrict the spiral spring from moving outward to the outside of the mounting cavity.

2. The dual protection structure for preventing chainsaw cable detachment as described in claim 1, characterized in that... ； The limiting protrusion is designed as a long strip and is bent into an arc shape along the inner contour of the mounting cavity.

3. The dual protection structure for preventing the chainsaw pull rope from coming off as described in claim 1, characterized in that; The limiting protrusion and the starter disk are integrally formed.

4. The dual protection structure for preventing the chainsaw pull rope from coming off as described in claim 1, characterized in that; The limiting protrusions are four that are evenly distributed along the circumference.

5. The dual protection structure for preventing the chainsaw pull rope from coming off as described in claim 4, characterized in that; The circumferential diameter formed by the inner contour of the limiting protrusion is set to be greater than the outer contour diameter of the starting ratchet.

6. The dual protection structure for preventing the chainsaw pull rope from coming off as described in claim 1, characterized in that; The limiting structure includes a ratchet fixing washer disposed outside the second mounting hole of the starting ratchet, and a fixing screw disposed inside the ratchet fixing washer, such that the fixing screw is threadedly connected to the threaded hole on the outer end face of the mounting post.

7. The dual protection structure for preventing the chainsaw pull rope from coming off as described in claim 1, characterized in that; It also includes a return spring fitted inside the mounting post and located between the inner side of the starter plate and the bottom surface inside the starter cover. The two connecting ends of the return spring are respectively connected to the starter cover and the starter plate. A return spring protective cover with an overall circular box structure and an open inner side is also provided on the outside of the return spring, so that the mounting post passes through and fits into the clearance hole of the return spring protective cover. It also includes a starter pull rope wrapped around the outer circumference of the starter plate. One end of the starter pull rope is connected and fixed to the starter plate, and the other end of the starter pull rope passes through a through hole on the starter cover and is connected to the starter handle.

8. The dual protection structure for preventing chainsaw cable detachment as described in claim 7, characterized in that; Each end of the starter disc has a ring-shaped retaining plate protruding from its outer circumference, and the starter pull rope is wound and positioned between the two retaining plates.

9. The dual protection structure for preventing the chainsaw pull rope from coming off as described in claim 8, characterized in that; Multiple limiting posts are provided on the bottom surface inside the starter cover and on the outer circumferential surface of the spacer ring plate, arranged at intervals along the circumferential direction.

10. The dual protection structure for preventing the chainsaw pull rope from coming off as described in claim 1, characterized in that; The starter cover has four mounting holes for mounting screws, which can mate with the mounting screw holes on the chainsaw engine to secure the starter cover to the chainsaw engine.

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