Electric chain saw with chain tension adjusting function

Abstract

The utility model discloses an electric chain saw with a chain tension adjusting function, which comprises a shell, a guide plate, a saw chain and a chain wheel for driving the saw chain by a motor, and further comprises a tension adjusting mechanism, the guide plate is movably fixed on the shell by adjusting the distance between the guide plate and the chain wheel; the tension adjusting mechanism is connected with one end, fixed on the shell, of the guide plate; the tension adjusting mechanism comprises a guide plate fixing block, a distance rotary adjusting plate and a control device; the guide plate fixing block is used for connecting and fixing the tensioning adjusting mechanism and the guide plate, and a limiting block is arranged on the guide plate fixing block; the distance rotary adjusting plate is matched with the limiting block of the guide plate fixing block, the whole distance rotary adjusting plate is circular, and the extending edge is in a spiral curve shape; the control device is fixedly connected with the distance rotary adjusting plate and controls the distance rotary adjusting plate to rotate; the electric chain saw with the chain tensioning adjusting function is simple in structure, reasonable in design 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 a chain tensioning and adjusting function. Background Art

[0002] A chainsaw is a sawing tool that uses a motor-driven chain to cut wood and other objects. The chain is attached to the outer perimeter of the chainsaw's guide bar. During operation, the chain wears out, requiring the user to manually replace the chain and then tighten and lock the guide bar. Existing chainsaws have separate tensioning and locking components, resulting in a complex structure and a large space requirement. Furthermore, securing the guide bar requires two steps, which is time-consuming and labor-intensive.

[0003] For improvements to existing chain saws, please refer to Chinese Invention Patent No. 201810566351.7, published on November 19, 2021, which discloses a chain saw and includes a locking device for fixing the guide plate and tensioning the chain. The locking device includes: a device housing; an operating member for the user to operate to rotate it around a first axis; and a first locking member for locking or releasing the guide plate. The first clutch assembly includes a first clutch member and a second clutch member. The rotation of the operating member includes a first direction and a second direction. When the first clutch assembly is in the first state, the operating member rotates in the first direction, acting on the first locking member to lock the guide plate. When the first clutch assembly is in the second state, the operating member can rotate in the second direction, acting on the first locking member to release the guide plate. In addition, the locking device also includes a pawl, and the second clutch member is formed with a ratchet. The pawl is unidirectionally engaged with the ratchet so that the second clutch member can only rotate in one direction. This locking device achieves a one-touch locking effect by integrating the tensioning chain and fixing the guide plate into a single action, saving time and effort. However, because the structure uses a ratchet pawl for unidirectional movement, the pawl will reverse during use, and there is no return mechanism for the distance the pawl moves toward the operating member. This can easily loosen the guide plate and cause the chain to fall off the teeth.

[0004] In view of this, it is indeed necessary to provide an improved chain saw to overcome the defects of the prior art. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an electric chain saw with a chain tensioning adjustment function, which has a simple structure, a reasonable design and is easy to use.

[0006] The technical solution of the utility model is as follows:

[0007] An electric chain saw with a chain tension adjustment function comprises a housing, a guide plate, a saw chain and a sprocket for a motor to drive the saw chain, and also comprises a tension adjustment mechanism;

[0008] The guide plate is fixed in the housing and protrudes from the front end of the housing; the saw chain is arranged on the sprocket and arranged along the edge of the guide plate, and is circulated and guided by the guide plate; the guide plate is movably fixed to the housing by adjusting the distance between the guide plate and the sprocket; the tension adjustment mechanism is connected to the end of the guide plate fixed to the housing;

[0009] The tensioning adjustment mechanism includes a guide plate fixing block, a distance rotary adjustment plate and a control device; the guide plate fixing block is used to connect and fix the tensioning adjustment mechanism to the guide plate, and a limit block is set on the guide plate fixing block; the distance rotary adjustment plate cooperates with the limit block of the guide plate fixing block, and is circular as a whole, and the extended edge is a spiral curve; the control device is connected and fixed to the distance rotary adjustment plate, and controls the distance rotary adjustment plate to rotate.

[0010] Furthermore, a limit block is provided in the middle of the side of the guide plate fixing block away from the sprocket, and the shortest radius length from the rotary adjustment plate is less than the distance from the center of the rotary adjustment plate to the limit block.

[0011] Furthermore, a through hole is provided on the guide plate, and a boss corresponding to the through hole is provided on the guide plate fixing block, and the boss is provided on a side opposite to the limiting block.

[0012] Furthermore, a fixing hole is provided on the distance adjustment plate, and a corresponding connecting piece is provided on the control device to connect and fix it.

[0013] Furthermore, the connecting piece is a fastener.

[0014] Furthermore, the control device includes a control knob and a control rod; the control knob is connected and fixed to the distance adjustment plate, and the control rod is used to control the fixation of the tensioning adjustment mechanism and the guide plate through a corresponding bolt structure.

[0015] Furthermore, the control device also includes an axial fixing member, which is cylindrical as a whole, and an annular boss is provided at one end close to the guide plate, and a shaft retaining ring is provided on the side of the annular boss close to the guide plate.

[0016] Furthermore, a first elliptical friction plate is provided on one end of the connecting member away from the control device and on one side of the guide plate away from the control device.

[0017] Furthermore, a second elliptical friction plate with a smaller outer diameter is provided on the first elliptical friction plate.

[0018] Furthermore, a positioning block is provided on the distance adjustment plate, and a groove cooperating with the positioning block is provided on a side of the control knob close to the guide plate.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The utility model adjusts the distance between the center of the distance adjustment plate and the limit block by rotating the distance adjustment plate, thereby adjusting the distance between the guide plate and the sprocket. The control device is connected and fixed to the distance adjustment plate, and controls the distance adjustment plate to rotate, thereby achieving a one-touch adjustment of the saw chain tension by the control device. It can be installed, uninstalled, replaced and maintained conveniently, and is bidirectionally adjustable without over-adjustment.

[0021] The utility model is provided with a specially shaped distance adjustment plate, which realizes tension adjustment within a certain distance range. Once over-adjustment occurs, it is easy to exceed the adjustment range, and the distance pushed by the guide plate fixing block is restored to its original position, thereby reducing the probability of damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a schematic diagram of the local structure of the utility model;

[0024] Figure 3 This is an exploded view of the tension adjustment structure and guide plate of the utility model;

[0025] Figure 4 This is a schematic diagram of the guide plate fixing block of the present utility model;

[0026] Figure 5 This is a schematic diagram of the guide plate fixing block of the present invention from another perspective;

[0027] Figure 6 This is a schematic diagram of the distance adjustment plate of the utility model;

[0028] Figure 7 This is a schematic diagram of the distance adjustment plate of the utility model from another perspective;

[0029] Figure 8 This is a schematic diagram of the partial assembly of the tension adjustment structure and the guide plate of the present utility model;

[0030] Figure 9 For the utility model Figure 8 Schematic diagram from another perspective;

[0031] Figure 10 This is a schematic diagram of the control knob of the present invention.

[0032] Markings in the figure: housing 1, guide plate 2, through hole 21, sprocket 3, tensioning adjustment mechanism 4, guide plate fixing block 5, limit block 51, boss 52, distance adjustment plate 6, fixing hole 61, positioning block 62, control device 7, control knob 71, groove 72, control rod 73, axial fixing part 74, annular boss 75, shaft retaining ring 76, connecting part 8, first elliptical friction plate 81, second elliptical friction plate 82. DETAILED DESCRIPTION

[0033] The following is a clear and complete description of the technical solution of this utility model patent in conjunction with the accompanying drawings. Obviously, the embodiments described are part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances. Anything not described in detail in this utility model can be implemented using conventional technical means.

[0035] like Figures 1 to 10 As shown, an electric chain saw with a chain tensioning adjustment function comprises a housing 1 , a guide plate 2 , a saw chain and a sprocket 3 for a motor to drive the saw chain, and also comprises a tensioning adjustment mechanism 4 .

[0036] The guide plate 2 is fixed within the housing 1 and protrudes from the front end of the housing 1. The saw chain is mounted on a sprocket 3 and runs along the edge of the guide plate 2, where it is guided in a loop. The guide plate 2 is removably fixed to the housing 1 by adjusting the spacing between the guide plate 2 and the sprocket 3. This allows the saw chain to be tensioned by adjusting the spacing between the guide plate 2 and the sprocket 3. A tensioning mechanism 4 is connected to the end of the guide plate 2 fixed to the housing 1.

[0037] The tension adjustment mechanism 4 includes a guide bar fixing block 5, a distance adjustment plate 6, and an operating device 7. The guide bar fixing block 5 is used to connect and secure the tension adjustment mechanism 4 to the guide bar 2, and a stopper 51 is provided on the guide bar fixing block 5. The distance adjustment plate 6, which cooperates with the stopper 51 of the guide bar fixing block 5, is generally circular with a spiral curve extending along its edge. Rotating the distance adjustment plate 6 changes the distance between the center of the distance adjustment plate 6 and the stopper 51, thereby adjusting the distance between the guide bar 2 and the sprocket 3. The operating device 7 is connected to the distance adjustment plate 6 and controls its rotation. This allows the operating device 7 to adjust the saw chain tension with a single click, making installation, removal, replacement, and maintenance easy, bidirectionally adjustable, and preventing over-adjustment.

[0038] Preferably, a stopper 51 is provided in the middle of the side of the guide plate fixing block 5 away from the sprocket 3, and the shortest radius from the rotary adjustment plate 6 is shorter than the distance from the center of the rotary adjustment plate 6 to the stopper 51. This ensures perfect coordination between the two, with the adjustment distance being the difference between the shortest and longest radius of the rotary adjustment plate 6.

[0039] Specifically, the guide plate 2 may be provided with a through hole 21, and the guide plate fixing block 5 may be provided with a boss 52 corresponding to the through hole 21, and the boss 52 may be provided on a side opposite to the limit block 51. That is, the through hole 21 is provided to achieve the connection and fixation between the guide plate fixing block 5 and the guide plate 2, and the movement of the guide plate fixing block 5 is the movement of the guide plate 2. Figure 4 、 5 As shown, the guide plate fixing block 5 is provided with only one boss 52, and multiple bosses can be provided as needed to facilitate fixing. In specific implementation, the boss 52 can also be provided with a clamping structure on one end away from the guide plate fixing block 5 to better connect with the guide plate 2.

[0040] As a preference, a fixing hole 61 is provided on the distance adjustment plate 6, and a corresponding connecting piece 8 is provided on the control device 7 to connect and fix it. The specific design of the fixing hole 61 is as follows: Figure 6 、 7 As shown, a curved surface, or circular hole, is provided on the side near the guide plate fixing block 5. The diameter of the circular hole increases as it approaches the guide plate fixing block 5. This design ensures sufficient space for the corresponding fasteners and facilitates installation. In other words, the control device 7 controls the distance adjustment plate 6 through the connector 8. Generally, connector 8 can be a fastener, such as a bolt, with threads provided in the corresponding position. Alternatively, the corresponding bolt and nut can be directly installed to facilitate maintenance and replacement of worn threads.

[0041] In terms of specific design, the control device 7 may include a control knob 71 and a control lever 73. The control knob 71 is fixedly connected to the distance adjustment plate 6, while the control lever 73 controls the fixing of the tension adjustment mechanism 4 to the guide plate 2 via a corresponding bolt structure. In other words, the control knob 71 and the distance adjustment plate 6 are integrated to provide better control. Of course, the control knob 71 and the distance adjustment plate 6 can also be designed as separate components, so that only the control lever 73 can be used. In other words, the distance adjustment plate 6 and the control lever 73 can be connected and fixed.

[0042] The control device 7 may also include an axial fixing member 74, which is generally cylindrical and has an annular boss 75 disposed on one end near the guide plate 2. A shaft retaining ring 76 is disposed on the side of the annular boss 75 near the guide plate 2 to prevent axial movement of the bolt structure. The overall design is similar to that of a screw threaded connection.

[0043] A first elliptical friction plate 81 is installed on the end of the connector 8 facing away from the control device 7 and on the side of the guide plate 2 facing away from the control device 7. This reinforces the guide plate 2 and prevents it from slipping or becoming unstable. Specifically, a second elliptical friction plate 82 with a smaller outer diameter is installed above the first elliptical friction plate 81 to strengthen the connection between the guide plate 2 and the control device 7. The addition of the second elliptical friction plate 82 also effectively increases the service life and reduces wear.

[0044] In summary, this solution allows the distance between the guide bar fixing block 5 and the center of the distance adjustment plate 6 to be controlled by the control lever 73, thereby adjusting the saw chain tension on the guide bar 2. Because the distance adjustment plate 6 is specially shaped, it allows tension adjustment within a certain distance range. However, if over-adjustment occurs, the guide bar fixing block 5 is easily pushed beyond the adjustment range, and the distance it was pushed back to its original position, thereby reducing the risk of damage.

[0045] Preferably, the distance adjustment plate 6 is provided with a positioning block 62, and the control knob 71 has a groove 72 on its side near the guide bar 2 that mates with the positioning block 62. That is, the distance adjustment plate 6 is fixedly connected to the control knob 71, while the control rod 73 is not. This allows the control knob 71 to tension the saw chain on the guide bar 2, while the control rod 73 secures the guide bar 2 longitudinally. This can be achieved by providing corresponding nut mounting holes on the control rod 73.

[0046] As a preferred embodiment, the space of the groove 72 is much larger than the positioning block 62. That is, the distance adjustment plate 6 and the control rod 73 are both connected and fixed to the control knob 71, so that the distance adjustment plate 6 can be rotated to achieve a larger adjustment, and the control knob 71 can be used to fine-tune the tensioning force. The fine-tuning distance is the movable space of the positioning block 62 in the space of the groove 72. Naturally, in actual design, the distance adjustment plate 6 and the control rod 73 are of split design. The longitudinal fixation of the guide plate 2 is achieved by bolts and nuts. For each distance fine-tuning, a one-way rotating gear groove (not shown) can be set between the control rod 73 and the distance adjustment plate 6. Naturally, the corresponding control device 7 can be fixed during relative rotation by cooperating with the housing 1. It can also be achieved by the connecting member 8, that is, after the connecting member 8 fixes the control device 7 and the guide plate 2, the friction between the parts is used to fix the control device 7 after rotation.

[0047] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is merely a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. For example, the specific design and implementation of fine adjustment between the joystick and the distance adjustment plate. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric chain saw with a chain tensioning adjustment function, comprising a housing, a guide plate, a saw chain, and a sprocket for a motor-driven saw chain, characterized in that: Also included is a tension adjustment mechanism; The guide plate is fixed in the housing and protrudes from the front end of the housing; the saw chain is arranged on the sprocket and arranged along the edge of the guide plate, and is circulated and guided by the guide plate; the guide plate is movably fixed to the housing by adjusting the distance between the guide plate and the sprocket; the tension adjustment mechanism is connected to the end of the guide plate fixed to the housing; The tensioning adjustment mechanism includes a guide plate fixing block, a distance rotary adjustment plate and a control device; the guide plate fixing block is used to connect and fix the tensioning adjustment mechanism to the guide plate, and a limit block is set on the guide plate fixing block; the distance rotary adjustment plate cooperates with the limit block of the guide plate fixing block, and is circular as a whole, and the extended edge is a spiral curve; the control device is connected and fixed to the distance rotary adjustment plate, and controls the distance rotary adjustment plate to rotate.

2. The electric chain saw with chain tension adjustment function according to claim 1, characterized in that: A limit block is arranged in the middle of one side of the guide plate fixing block away from the sprocket, and the shortest radius length from the rotary adjustment plate is less than the distance from the center of the rotary adjustment plate to the limit block.

3. The electric chain saw with chain tension adjustment function according to claim 1, characterized in that: A through hole is provided on the guide plate, and a boss corresponding to the through hole is provided on the guide plate fixing block, and the boss is provided on a side opposite to the limiting block.

4. The electric chain saw with chain tension adjustment function according to claim 1, characterized in that: A fixing hole is provided on the distance adjustment plate, and a corresponding connecting piece is provided on the control device to connect and fix it.

5. The electric chain saw with chain tension adjustment function according to claim 4, characterized in that: The connecting parts are fasteners.

6. The electric chain saw with chain tension adjustment function according to claim 4, characterized in that: The control device includes a control knob and a control rod; the control knob is connected and fixed to the distance adjustment plate, and the control rod is used to control the fixation of the tension adjustment mechanism and the guide plate through a corresponding bolt structure.

7. The electric chain saw with chain tension adjustment function according to claim 6, characterized in that: The control device also includes an axial fixing member, which is cylindrical as a whole and has an annular boss arranged at one end close to the guide plate, and a shaft retaining ring arranged at one side of the annular boss close to the guide plate.

8. The electric chain saw with chain tension adjustment function according to claim 4, characterized in that: A first elliptical friction plate is provided on one end of the connecting member away from the control device and on one side of the guide plate away from the control device.

9. The electric chain saw with chain tension adjustment function according to claim 8, characterized in that: A second elliptical friction plate with a smaller outer diameter is also arranged on the first elliptical friction plate.

10. The electric chain saw with chain tension adjustment function according to claim 6, characterized in that: A positioning block is arranged on the distance adjustment plate, and a groove matched with the positioning block is arranged on a side of the control knob close to the guide plate.

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