Quick tensioning structure of chain of electric chain saw

Abstract

The utility model discloses a quick tensioning structure of an electric chain saw chain, which comprises a chain saw body, a guide plate and a saw chain, one end of the guide plate is fixedly connected onto the chain saw body, the saw chain is rotatably connected onto the guide plate, an adjusting part is rotatably arranged on the guide plate, and a chain wheel capable of being meshed with the saw chain is rotatably arranged at one end of the adjusting part. When the adjusting piece rotates to the position where the chain wheel is located above the guide plate, the chain wheel jacks up the saw chain and is meshed with the saw chain, the vertical distance between the chain wheel and the edge of the guide plate is changed along with rotation of the adjusting piece in the process that the adjusting piece rotates around the rotating connecting point, and the adjusting piece is provided with a locking piece capable of fixing the locking assembly to the guide plate. When the adjusting assembly rotates to enable the chain wheel to jack up the saw chain till the chain is tensioned, the adjusting piece is fixed to the guide plate through the locking piece. Compared with the prior art, the utility model has the advantages that the tightness of the saw chain can be adjusted at any time, the adjustment is simple and quick, and injury accidents caused by looseness of the saw chain can be avoided.

Description

Technical Field

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

[0002] An electric chain saw is a woodworking power tool that uses a rotating chain saw blade to saw wood, branches, etc. With the development of society, the application areas of electric chain saws are becoming increasingly wider, and safety issues have also become the main problem to be solved in the industry. Therefore, many electric chain saws that prevent safety accidents have appeared on the market.

[0003] For example, the Chinese utility model patent "An Electric Chain Saw" with patent publication number CN206085226U includes a motor, a motor box, a saw chain, a saw chain guide, a handle, and a side handle, wherein the motor is located on the motor box, the motor box is connected to the handle, a switch is provided on the handle, the switch is connected to the motor, a saw chain clamp is connected to the motor box, the saw chain is wound around the saw chain clamp, the end of the saw chain is wound around the main shaft of the motor, protective plates are provided on both sides of the saw chain clamp, soft pads are provided on the edges of the protective plates, the soft pads on both sides are in contact with each other, a human body proximity sensor is provided in the middle of the chain saw clamp, and the human body proximity sensor is connected to the motor.

[0004] During the use of the electric chain saw of the above scheme, the chain is subjected to severe vibration, and after a long time, the chain will become loose from the saw chain guide plate. If it is not adjusted in time, the chain will become loose or even detach from the chain plate, causing an injury accident. Utility Model Content

[0005] The utility model aims at solving the problem that the chain of an electric chain saw becomes loose with the saw chain guide plate after long-term use, and the technical problem to be solved by the utility model is to provide a fast tensioning structure of the chain of the electric chain saw.

[0006] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a rapid tensioning structure of an electric chain saw chain, comprising a chain saw body, a guide plate with one end fixedly connected to the chain saw body, and a saw chain rotatably connected to the guide plate, an adjusting member is rotatably provided on the guide plate, a sprocket that can engage with the saw chain is rotatably provided on one end of the adjusting member, when the adjusting member is rotated until the sprocket is located above the guide plate, the sprocket lifts up the saw chain and engages with the saw chain, and during the rotation of the adjusting member around the rotating connection point, the vertical distance from the sprocket to the edge of the guide plate changes with the rotation of the adjusting member, and the adjusting member is provided with a locking member that can fix the locking assembly to the guide plate, and when the adjusting assembly rotates to cause the sprocket to lift up the saw chain until the chain is tensioned, the adjusting member is fixed to the guide plate through the locking member.

[0007] A further preferred solution of the utility model is that: the guide plate is provided with an escape opening extending inward from the edge, and the sprocket rotates in the escape opening.

[0008] A further preferred solution of the present utility model is that when the sprocket abuts against both sides of the avoidance opening, the top of the sprocket is flush with the edge of the guide plate.

[0009] A further preferred solution of the present utility model is that the adjusting member includes a first adjusting rod, one end of the first adjusting rod is rotatably connected to the guide plate, and the other end is rotatably connected to the sprocket.

[0010] A further preferred solution of the present utility model is that the adjusting member includes a first adjusting rod, a second adjusting rod and a connecting shaft. The connecting shaft is rotatably arranged on the guide plate and is fixedly connected to the first connecting rod and the second connecting rod at both ends respectively. The sprocket is rotatably arranged at one end of the first connecting rod and the second connecting rod far from the connecting shaft and is located between the two.

[0011] A further preferred solution of the present utility model is that the sprocket has limiting plates on both sides, and the two limiting plates form a guiding channel for preventing the saw chain from slipping sideways.

[0012] A further preferred solution of the present utility model is that the locking member is a bolt and nut assembly. A connecting hole is provided on the adjusting member, and an arc-shaped slot is provided on the guide plate. The bolt passes through the connecting hole and the arc-shaped slot in sequence to fix the adjusting member on the guide plate.

[0013] A further preferred solution of the present utility model is that the center of the arc-shaped slot coincides with the rotation point of the adjusting member.

[0014] A further preferred solution of the present utility model is that the connecting line between the left end point of the avoidance opening and the left end point of the arc-shaped slot is collinear with the adjusting member around the rotation connection point, and the connecting line between the right end point of the avoidance opening and the right end point of the arc-shaped slot is collinear with the adjusting member around the rotation connection point.

[0015] A further preferred solution of the present utility model is that when the adjusting member rotates to be perpendicular to the length direction of the guide plate, it is the maximum distance for jacking up the saw chain.

[0016] Compared with the prior art, the present utility model has the following advantages: By rotatably arranging an adjusting member on the guide plate and a locking member for fixing the adjusting member on the guide plate, when the adjusting member rotates to a position where the sprocket is above the guide plate, the sprocket jacks up the saw chain and meshes with the saw chain. During the rotation of the adjusting member, the vertical distance from the sprocket to the edge of the guide plate changes with the rotation of the adjusting member, and the distance between the saw chain and the edge of the guide plate also changes. The rotation of the adjusting assembly makes the sprocket jack up the saw chain until the distance between the chain and the edge of the guide plate becomes larger. The saw chain is tensioned and the adjusting member is fixed on the guide plate through the locking member. The design of the saw chain tensioning structure can adjust the tightness of the saw chain at any time, with simple and quick adjustment, and at the same time, it can avoid injury accidents caused by the loosening of the saw chain. Description of the Drawings

[0017] The present utility model will be further described in detail below in conjunction with the 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 of the preferred embodiment of the present utility model after removing the protective cover;

[0020] Figure 3 For the preferred embodiment of the present utility model Figure 2 Partial enlarged view of part A in;

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

[0022] Figure 5 Schematic diagram of the three-dimensional structure of the preferred embodiment of the present utility model after removing the protective cover and the adjusting member.

[0023] In the figure: 1, chainsaw body; 2, guide plate; 21, avoidance opening; 22, arc-shaped slot; 3, saw chain; 4, adjusting member; 41, first adjusting rod; 42, second adjusting rod; 43, connecting shaft; 44, connecting hole; 5, sprocket; 6, limiting plate; 7, locking member; 8, protective cover; 9, battery box. Detailed implementation manners

[0024] The preferred embodiments of the present utility model will be described in detail below with reference to the 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 the subsequent drawings.

[0026] This embodiment mainly elaborates on a quick tensioning structure for an electric chainsaw chain, as follows:

[0027] Such as Figures 1 to 5As shown in the figure, a quick tensioning structure for an electric chain saw chain includes a chain saw body 1, a protective cover 8, a guide plate 2, and a saw chain 3. The protective cover 8 is provided at one end of the chain saw body 1 and covers the upper parts of the guide plate 2 and the saw chain 3. One end of the guide plate 2 is fixedly connected to the chain saw body 1, and the saw chain 3 is rotatably arranged on the guide plate 2. An adjusting member 4 is rotatably arranged on the guide plate 2. The adjusting assembly is used to adjust the tightness of the saw chain 3. A sprocket 5 that can mesh with the saw chain 3 is rotatably arranged at one end of the adjusting member 4. When the adjusting member 4 rotates to a position where the sprocket 5 is above the guide plate 2, the sprocket 5 jacks up the saw chain 3 and meshes with the saw chain 3. During the rotation of the adjusting member 4 around the rotation connection point, the vertical distance from the sprocket 5 to the edge of the guide plate 2 changes as the adjusting member 4 rotates, and the distance between the saw chain 3 and the edge of the guide plate 2 also changes. By adjusting the adjusting assembly to jack up the saw chain 3, the distance between the saw chain 3 and the edge of the guide plate 2 is increased or decreased, thereby realizing the adjustment of the tightness of the saw chain 3. A locking member 7 that can fix the locking assembly to the guide plate 2 is provided on the adjusting member 4. When the adjusting assembly rotates to make the sprocket 5 jack up the saw chain 3 until the chain is tightened, the adjusting member 4 is fixed to the guide plate 2 through the locking member 7. The design of the saw chain tensioning structure can adjust the tightness of the saw chain 3 at any time. The adjustment is simple and fast, which can avoid injury accidents caused by the loosening of the saw chain 3, and also avoid the problem of low work efficiency caused by the loosening of the saw chain 3.

[0028] Specifically, in order to prevent interference with the sprocket 5 during the use of the adjusting member 4, a relief opening 21 extending inward from the edge is provided on the guide plate 2. The sprocket 5 rotates within the relief opening 21. When the sprocket abuts against both sides of the relief opening 21, the top of the sprocket 5 is flush with the edge of the guide plate 2. When the adjusting member 4 rotates from both sides of the relief opening 21 towards the middle, the sprocket 5 jacks up the saw chain 3, and the vertical distance from the saw chain 3 to the edge of the guide plate 2 becomes larger and larger. When the adjusting member 4 rotates to be perpendicular to the length direction of the guide plate 2, the vertical distance from the saw chain 3 to the edge of the guide plate 2 is the maximum distance for jacking up the saw chain 3.

[0029] Specifically, the adjusting member 4 has two structures. The first structure is specifically that the adjusting member 4 includes a first adjusting rod 41. One end of the first adjusting rod 41 is rotatably connected to the guide plate 2, and the other end is rotatably connected to the sprocket 5. The second structure is specifically as Figure 4As shown, the adjusting member 4 includes a first adjusting rod 41, a second adjusting rod 42 and a connecting shaft 43. The connecting shaft 43 is rotatably arranged on the guide plate 2 and is fixedly connected to the first connecting rod and the second connecting rod at both ends respectively. The sprocket 5 is rotatably arranged at one end of the first connecting rod and the second connecting rod away from the connecting shaft 43 and is located between them. The first adjusting rod 41 and the second adjusting rod 42 mainly play a supporting role. Compared with the two structures, the second structure is more stable than the first structure. Therefore, the second structure is preferably selected. To prevent the chain from shifting during the use of the adjusting member 4, limiting plates 6 are provided on both sides of the sprocket 5. The limiting plates 6 are preferably circular. The limiting plates 6 are fixedly connected to the sprocket 5 or are integrally formed with the sprocket 5. The two limiting plates 6 form a guiding channel to prevent the saw chain 3 from slipping sideways. During the use of the electric chain saw, the saw chain 3 meshes with the sprocket 5 in the guiding channel and slides through the guiding channel.

[0030] Specifically, the locking member 7 is a bolt and nut assembly. Corresponding connecting holes 44 are provided on both the first adjusting rod 41 and the second adjusting rod 42 of the adjusting member 4. An arc-shaped slot 22 is provided on the guide plate 2. The bolt passes through the connecting hole 44 and the arc-shaped slot 22 in sequence to fix the adjusting member 4 on the guide plate 2. The center of the arc-shaped slot 22 coincides with the rotation point of the adjusting member 4, and the bolt always slides within the arc-shaped slot 22. The line connecting the left end point of the avoidance opening 21 and the left end point of the arc-shaped slot 22 is collinear with the adjusting member 4 around the rotation connection point. The line connecting the right end point of the avoidance opening 21 and the right end point of the arc-shaped slot 22 is collinear with the adjusting member 4 around the rotation connection point. This can prevent the arc-shaped slot 22 from interfering during the rotation of the first adjusting rod 41 and the second adjusting rod 42. Moreover, the setting of the arc-shaped slot 22 allows the first adjusting rod 41 and the second adjusting rod 42 to rotate and be fixed at any position within the arc-shaped slot 22.

[0031] A battery box 9, a motor (not shown in the figure) and a transmission assembly (not shown in the figure) are provided inside the chain saw body 1. The battery in the battery box 9 is electrically connected to the motor (not shown in the figure). The output end of the motor (not shown in the figure) is connected to the transmission assembly (not shown in the figure). The output shaft (not shown in the figure) of the transmission assembly (not shown in the figure) is drivingly connected to the saw chain 3. When the motor (not shown in the figure) is started, the battery in the battery box 9 provides power for the motor (not shown in the figure). The motor drives the transmission assembly (not shown in the figure) to rotate. The output shaft of the transmission assembly (not shown in the figure) drives the saw chain 3 of the electric chain saw to rotate to cut wood.

[0032] When the saw chain 3 on the electric chain saw needs to be loosened and adjusted, loosen the nut at the bolt on the guide plate 2, and rotate the first adjusting rod 41 and the second adjusting rod 42 to move towards the middle of the avoidance opening 21. The sprocket 5 follows the movement of the first adjusting rod 41 and the second adjusting rod 42, so that the sprocket 5 jacks up the saw chain 3. When the saw chain 3 is jacked to a taut state, tighten the nut to fix the first adjusting rod 41 and the second adjusting rod 42 on the guide plate 2.

[0033] 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.

[0034] The above has introduced in detail a quick tensioning structure for the chain of an electric chain saw provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the present invention and its core idea. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A quick tensioning structure for an electric chain saw chain, comprising a chain saw body, a guide plate fixedly connected to the chain saw body at one end, and a saw chain rotatably connected to the guide plate, characterized in that: A regulating member is rotatably provided on the guide plate. One end of the regulating member is rotatably provided with a sprocket that can mesh with the saw chain. When the regulating member rotates to a position where the sprocket is above the guide plate, the sprocket jacks up the saw chain and meshes with the saw chain. During the rotation of the regulating member around the rotation connection point, the vertical distance from the sprocket to the edge of the guide plate changes as the regulating member rotates. The regulating member has a locking member that can fix the locking assembly to the guide plate. When the regulating assembly rotates to make the sprocket jack up the saw chain until the chain is tensioned, the regulating member is fixed to the guide plate through the locking member.

2. The quick tensioning structure of an electric chain saw chain according to claim 1, wherein: A relief opening extending inward from the edge is provided on the guide plate, and the sprocket rotates within the relief opening.

3. The quick tensioning structure of an electric chain saw chain according to claim 2, characterized in that: When the sprocket abuts against both sides of the relief opening, the top of the sprocket is flush with the edge of the guide plate.

4. The quick tensioning structure of an electric chain saw chain according to claim 2, characterized in that: The regulating member includes a first regulating rod. One end of the first regulating rod is rotatably connected to the guide plate, and the other end is rotatably connected to the sprocket.

5. The quick tensioning structure of an electric chain saw chain according to claim 2, wherein: The regulating member includes a first regulating rod, a second regulating rod, and a connecting shaft. The connecting shaft is rotatably provided on the guide plate and is fixedly connected to the first connecting rod and the second connecting rod at both ends respectively. The sprocket is rotatably provided at one end of the first connecting rod and the second connecting rod away from the connecting shaft and is located between the two.

6. The quick tensioning structure of an electric chain saw chain according to claim 1, characterized in that: The sprocket has limiting plates on both sides, and the two limiting plates form a guiding channel to prevent the saw chain from slipping sideways.

7. The quick tensioning structure of an electric chain saw chain according to claim 2, characterized in that: The locking member is a bolt and nut assembly. A connecting hole is provided on the regulating member, and an arc-shaped slot is provided on the guide plate. The bolt passes through the connecting hole and the arc-shaped slot in sequence to fix the regulating member to the guide plate.

8. The rapid tensioning structure of an electric chain saw chain according to claim 7, characterized in that: The center of the arc-shaped slot coincides with the rotation point of the regulating member.

9. The quick tensioning structure of an electric chain saw chain according to claim 7, wherein: The line connecting the left endpoint of the relief opening and the left endpoint of the arc-shaped slot is collinear with the regulating member around the rotation connection point, and the line connecting the right endpoint of the relief opening and the right endpoint of the arc-shaped slot is collinear with the regulating member around the rotation connection point.

10. The quick tensioning structure of an electric chain saw chain according to claim 1, characterized in that: When the regulating member rotates to be perpendicular to the length direction of the guide plate, it is the maximum distance to jack up the saw chain.

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