Electric chain saw with automatic chain tensioning structure

Abstract

The utility model discloses an electric chain saw with an automatic chain tensioning structure, which comprises a chain saw body, a guide plate fixedly connected to one side of the chain saw body and a chain rotatably sleeved on the edge of the guide plate, and a mounting opening recessed from the edge of the guide plate to the inside of the guide plate is arranged on one side of the guide plate close to the chain saw body. A supporting plate is arranged in the mounting opening, the two ends of the supporting plate are fixedly connected with the side wall of the mounting opening, an automatic tensioning structure which rebounds after being pressed is arranged on the supporting plate in a sliding mode, and a chain wheel which is meshed with the chain all the time and jacks up the chain to enable the chain to be tensioned is rotationally arranged at the end of the automatic tensioning structure. Compared with the prior art, the chain tensioning device has the advantages that when the chain is loosened in the using process, the automatic tensioning structure can automatically ascend to jack up and tighten the chain, manual adjustment is not needed, and the chain tensioning device is easy and convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of electric chain saws, in particular to an electric chain saw with an automatic chain tensioning structure. Background Technique

[0002] An electric chain saw is a power tool with a serrated chain, which is used to cut wood with a high-speed rotating chain saw blade for standby. During the use of the electric chain saw, the chain becomes loose due to long-term friction and intense movement. After the chain becomes loose, the chain may break away from the guide plate, posing a threat to the safety of the operator. To solve the above problems, some structures for adjusting the tightness of the electric chain saw chain have appeared on the market.

[0003] For example, the Chinese utility model patent "An electric chain saw for facilitating the adjustment of chain saw tension" with the patent publication number CN219666910U includes a guide plate, which is divided into two parts to form an exposed cutting part and a fixing part for connecting with the chain saw body. Panels are installed on both sides of the fixing part, and one end of each panel extends to the cutting part. Sliders are installed on the opposite surfaces of the panels, and chutes are provided on both side surfaces of the cutting part opposite to the sliders. The sliders are slidably installed in the chutes. A lead screw assembly is installed between the cutting part and the fixing part, and a rotating assembly for driving the lead screw assembly to rotate is installed on one side of the panel.

[0004] The above solution drives the lead screw assembly to rotate by rotating the rotating assembly. The rotation of the lead screw assembly can drive the cutting part to extend to tighten the chain. However, each adjustment requires manual adjustment, which is rather troublesome. Content of the Utility Model

[0005] In view of the problem that the chain of the electric chain saw needs to be manually adjusted every time it becomes loose, the technical problem to be solved by the utility model is to provide an electric chain saw with an automatic chain tensioning structure to solve the above problem.

[0006] The technical solution adopted by the utility model to solve the above technical problem is: an electric chain saw with an automatic chain tensioning structure, including a chain saw body, a guide plate fixedly connected to one side of the chain saw body, and a chain rotatably sleeved on the edge of the guide plate. An installation opening recessed from the edge of the guide plate into the interior of the guide plate is provided on the side of the guide plate close to the chain saw body. A support plate with both ends fixedly connected to the side wall of the installation opening is provided in the installation opening. An automatic tensioning structure that is pressed and rebounds is slidably provided on the support plate. A sprocket that always meshes with the chain and jacks up the chain to tighten the chain is rotatably provided at the end of the automatic tensioning structure.

[0007] A further preferred solution of the present utility model is as follows: The automatic tensioning structure includes a sliding column and a return spring sleeved on the sliding column. A through hole is provided on the support plate. The sliding column passes through the through hole and is slidably arranged on the support plate. The sprocket is located at the upper end of the sliding column. A limiting platform is provided on one side of the sliding column close to the sprocket. One end of the return spring abuts against the top surface of the support plate, and the other end abuts against the bottom surface of the limiting platform.

[0008] A further preferred solution of the present utility model is as follows: The sliding column is a polygonal column or a special-shaped column, and the shape of the through hole matches that of the sliding column.

[0009] A further preferred solution of the present utility model is as follows: The total height of the sliding column and the sprocket after being installed in the installation opening is equal to the depth of the installation opening.

[0010] A further preferred solution of the present utility model is as follows: A detachable limiting member for adjusting the lifting height of the sliding column is provided at one end of the sliding column away from the sprocket.

[0011] A further preferred solution of the present utility model is as follows: The limiting member is a nut, and the sliding column has a thread that cooperates with the nut.

[0012] A further preferred solution of the present utility model is as follows: Limiting plates are provided on both sides of the sprocket. The diameter of the limiting plate is larger than that of the sprocket. The limiting plate and the sprocket form a sliding channel for the chain to pass through.

[0013] A further preferred solution of the present utility model is as follows: An installation groove is provided at the upper end of the sliding column. A rotating shaft is provided on the axis of the sprocket and the limiting plate. Both ends of the rotating shaft are respectively rotatably connected to both sides of the installation groove.

[0014] A further preferred solution of the present utility model is as follows: There is a distance between the support plate and the bottom wall of the installation opening.

[0015] A further preferred solution of the present utility model is as follows: A protective cover that covers the upper parts of the chain and the guide plate is fixedly connected to the chain saw body.

[0016] Compared with the prior art, the present utility model has the following advantages: Through an installation opening that is recessed from the edge of the guide plate into the interior of the guide plate, a support plate with both ends fixedly connected to the side walls of the installation opening is provided inside the installation opening. An automatically tensioning structure that is pressed and rebounds is slidably arranged on the support plate. A sprocket that always meshes with the chain and jacks up the chain to tension the chain is rotatably arranged at the end of the automatically tensioning structure. By setting the automatically tensioning structure, when the chain becomes loose during use, the automatically tensioning structure will rise by itself to jack up and tighten the chain, eliminating the need for manual adjustment, making it simple and convenient to use. Description of the Drawings

[0017] The present utility model will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present utility model. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 Schematic diagram of the three-dimensional structure of the preferred embodiment of the present utility model;

[0019] Figure 2 Schematic diagram of the three-dimensional structure after the protective cover of the preferred embodiment of the present utility model is disassembled;

[0020] Figure 3 Partial enlarged view of part A of the preferred embodiment of the present utility model;

[0021] Figure 4 Schematic diagram of the three-dimensional structure of the automatic tensioning structure of the preferred embodiment of the present utility model;

[0022] Figure 5 Schematic diagram of the three-dimensional structure of the disassembled chain and automatic tensioning structure of the preferred embodiment of the present utility model.

[0023] In the figure: 1, chain saw body; 2, guide plate; 3, chain; 4, mounting port; 41, support plate; 5, automatic tensioning structure; 51, return spring; 52, sliding column; 53, limiting platform; 6, sprocket; 7, limiting plate; 8, nut; 9, thread; 10, mounting groove; 11, protective cover. Specific embodiments

[0024] The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Those skilled in the art will understand that these descriptions are only descriptive and exemplary and should not be construed as limiting the protection scope of the present utility model.

[0025] It should be noted that: similar reference numerals represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it may not be further defined and explained in subsequent drawings.

[0026] This embodiment mainly describes an electric chain saw with an automatic chain tensioning structure, specifically as follows:

[0027] As Figures 1 to 5As shown in the figure, an electric chain saw with an automatic chain tensioning structure includes a chain saw body 1. On one side of the chain saw body 1, a guide plate 2 is fixedly connected. A chain 3 is rotatably sleeved on the edge of the guide plate 2. A protective cover 11 that covers the upper parts of the chain 3 and the guide plate 2 is fixedly connected to the chain saw body 1. On the side of the guide plate 2 close to the chain saw body 1, there is an installation opening 4 that is recessed from the edge of the guide plate 2 towards the inside of the guide plate 2. Inside the installation opening 4, there is a support plate 41 whose two ends are fixedly connected to the side walls of the installation opening 4. An automatic tensioning structure 5 that is pressed and rebounds is slidably arranged on the support plate 41. At the end of the automatic tensioning structure 5, a sprocket 6 that always meshes with the chain 3 and jacks up the chain 3 to tension the chain 3 is rotatably arranged. Under normal conditions, the automatic tensioning structure 5 is always in a compressed state. When the chain 3 becomes loose, the tensioning structure automatically rebounds to jack up the chain 3 and tighten the chain 3. By setting the automatic tensioning structure 5, when the chain 3 becomes loose during use, the automatic tensioning structure 5 will rise by itself to jack up the chain 3 and tighten it, without the need for manual adjustment, which is simple and convenient to use.

[0028] Specifically, the automatic tensioning structure 5 includes a sliding column 52 and a return spring 51 sleeved on the sliding column 52. There is a through hole on the support plate 41. The sliding column 52 passes through the through hole and is slidably arranged on the support plate 41. The sprocket 6 is located at the upper end of the sliding column 52. A limiting platform 53 is arranged on the side of the sliding column 52 close to the sprocket 6. One end of the return spring 51 abuts against the top surface of the support plate 41, and the other end abuts against the bottom surface of the limiting platform 53. When the electric chain saw is initially used, since the chain 3 is in a tensioned state itself, the return spring 51 is compressed. During the use of the electric chain saw, when the chain 3 becomes loose, under the action of the elastic force of the return spring 51, it will push the sliding column 52 to slide upward, thereby driving the sprocket 6 to slide upward to jack up the chain 3 and tension the chain 3.

[0029] Specifically, the sliding column 52 is a polygonal column or a special-shaped column. The shape of the through hole matches that of the sliding column 52. When the sliding column 52 is a polygonal column, the through hole is a polygonal hole. When the sliding column 52 is a special-shaped column, the through hole is a special-shaped hole that matches it. The sliding column 52 being a polygonal column or a special-shaped column can prevent the sprocket 6 and the sliding column 52 from shifting during the rotation of the chain saw, thus affecting the normal rotation of the chain skipping.

[0030] Specifically, the total height of the sliding column 52 and the sprocket 6 after being installed in the installation opening 4 is equal to the depth of the installation opening 4. When the chain saw just leaves the factory, the chain 3 is in a tensioned state. At this time, the chain 3 has a downward pressure on the sprocket 6. The return spring 51 is squeezed by the limiting platform 53 and the support plate 41. The bottom end of the sliding column 52 abuts against the bottom wall of the installation opening 4, and the upper end of the sprocket 6 is flush with the notch.

[0031] Specifically, a detachable limiting member for adjusting the lifting height of the sliding column 52 is provided at one end of the sliding column 52 away from the sprocket 6. The limiting member is a nut 8, and the sliding column 52 has a thread 9 that cooperates with the nut 8. When the electric chain saw leaves the factory, since the chain 3 is in a tensioned state and the elastic force of the return spring 51 is the largest at this time, in order to prevent the larger elastic force from stretching the chain 3, the bolt can be adjusted to slide upwards and abut against the support plate 41 to offset part of the elastic force. Under normal circumstances, the nut 8 does not abut against the support plate 41, and only in this way can the automatic tensioning structure 5 work properly. When the automatic tensioning causes the bolt to abut against the support plate 41 and the sliding column 52 is restricted from sliding upwards any further and the sprocket 6 can no longer lift the chain 3, the nut 8 can be adjusted downwards. Under the action of the elastic force of the return spring 51, the sliding column 52 automatically slides upwards. The limiting member can also be other structures that can be fixedly detached from the sliding column 52, and preferably it is the nut 8.

[0032] Specifically, there is a spacing between the support plate 41 and the bottom wall of the installation opening 4, and this spacing is the amplitude space for the sliding column 52 to lift and lower. The chain 3 is in a tensioned state and will squeeze the lifting column downwards. The lower end of the lifting column can descend within the amplitude space. When the chain 3 becomes loose, under the action of the return spring 51, the lifting column slides upwards to lift the chain 3 to make the chain 3 tensioned.

[0033] Specifically, there are limiting plates 7 on both sides of the sprocket 6. The limiting plates 7 are preferably circular. The diameter of the limiting plates 7 is larger than the diameter of the sprocket 6 and the centers of the limiting plates 7 are collinear with the axis of the sprocket 6. The limiting plates 7 and the sprocket 6 form a sliding channel for the chain 3 to pass through. The setting of the limiting plates 7 plays a role of guiding and limiting, and can prevent the chain 3 from shifting during rotation.

[0034] Specifically, the upper end of the sliding column 52 has an installation groove 10. A rotating shaft is provided on the axis of the sprocket 6 and the limiting plates 7, and both ends of the rotating shaft are respectively rotatably connected to both sides of the installation groove 10.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0036] The above has introduced in detail the electric chain saw with an automatic chain tensioning structure provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only for helping to understand the present utility model and its core idea. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. An electric chain saw with an automatic chain tensioning structure, comprising a chain saw body, a guide plate fixedly connected to one side of the chain saw body, and a chain rotatably sleeved on the edge of the guide plate, characterized in that: One side of the guide plate close to the chainsaw body has a mounting opening recessed from the edge of the guide plate towards the inside of the guide plate. Inside the mounting opening, there is a support plate with both ends fixedly connected to the side wall of the mounting opening. An automatically tensioning structure that is compressed and rebounds is slidably arranged on the support plate. A sprocket that always meshes with the chain and jacks up the chain to tension the chain is rotatably arranged at the end of the automatically tensioning structure. The automatically tensioning structure includes a sliding column and a return spring sleeved on the sliding column. A through hole is provided on the support plate, and the sliding column passes through the through hole and is slidably arranged on the support plate. The sprocket is located at the upper end of the sliding column. A limiting platform is arranged on one side of the sliding column close to the sprocket. One end of the return spring abuts against the top surface of the support plate, and the other end abuts against the bottom surface of the limiting platform.

2. The electric chain saw with an automatic chain tensioning structure according to claim 1, characterized in that: The sliding column is a polygonal column or a special-shaped column, and the shape of the through hole matches that of the sliding column.

3. The electric chain saw with an automatic chain tensioning structure according to claim 1, wherein: The total height of the sliding column and the sprocket after being installed in the mounting opening is equal to the depth of the mounting opening.

4. The electric chain saw with an automatic chain tensioning structure according to claim 1, wherein: A detachable limiting member for adjusting the lifting height of the sliding column is arranged at one end of the sliding column away from the sprocket.

5. The electric chain saw with an automatic chain tensioning structure according to claim 4, characterized in that: The limiting member is a nut, and the sliding column has a thread that cooperates with the nut.

6. The electric chain saw with an automatic chain tensioning structure according to claim 1, characterized in that: Both sides of the sprocket have limiting plates, and the diameter of the limiting plates is larger than that of the sprocket. The limiting plates and the sprocket form a sliding channel for the chain to pass through.

7. The electric chain saw with an automatic chain tensioning structure according to claim 6, characterized in that: An installation groove is provided at the upper end of the sliding column. A rotating shaft is provided on the axis of the sprocket and the limiting plates, and both ends of the rotating shaft are respectively rotatably connected to both sides of the installation groove.

8. The electric chain saw with an automatic chain tensioning structure according to claim 1, characterized in that: There is a spacing between the support plate and the bottom wall of the mounting opening.

9. The electric chain saw with an automatic chain tensioning structure according to claim 1, wherein: A protective cover that covers the upper parts of the chain and the guide plate is fixedly connected to the chainsaw body.

Images