Chainsaw

Abstract

The present invention relates to a chain saw equipped with a guide plate. The chain saw includes a main housing, a guard that presses against the guide plate, a positioning bolt installed on the main housing, and a locking knob connected to the positioning bolt. The guide plate includes a through chute. The positioning bolt protrudes outward from the surface of the main housing through the chute and extends into the guard. The chain saw includes a pressing structure installed on the guard, and the pressing structure abuts against the outer surface of the guide plate. By providing the pressing structure on the guard, which abuts against the outer surface of the guide plate, the present invention enables the chain to maintain a balanced state before being tensioned, effectively solving the problem of warping of the guide plate during tensioning that exists in the current market, and has relatively high safety.

Description

Technical Field

[0001] The present invention relates to the field of gardening tools, and particularly to a chain saw.

Background Art

[0002] A chain saw is a type of gardening tool driven by a motor to rotate a chain for cutting wood. The chain saw includes a guide plate protruding to the front end of the housing and a tensioning structure connected to the guide plate. The chain is installed on the outer periphery of the guide plate and rotates along the guide plate; the tensioning structure drives the guide plate to move away from or close to the housing to perform disassembly and assembly operations on the chain.

[0003] The tensioning structure of the existing chain saw is installed on the guide plate guard or on the housing of the chain saw. When the tensioning structure is installed on the guide plate guard, the user needs to hold the guide plate with one hand and adjust it with the other hand, which is very inconvenient to operate; when the tensioning structure is installed on the housing of the chain saw, due to the self-weight of the guide plate, the guide plate will be uneven when placed, and there is no limit at the position near the sprocket, so the guide plate will tilt, making it easy to be skewed when the guide plate is locked, and even there is a phenomenon of tooth dropout and falling after the chain is tightened, posing a danger of injury.

[0004] For the improvement of the existing chain saw, reference can be made to Chinese Patent No. 201110043838.5, announced on October 09, 2013, which discloses an improved structure for installing a chain plate of an electric chain saw, including a housing body, a chain plate installed on the housing body, and a chain plate holding mechanism provided on the housing body for keeping the chain plate stable during installation. The chain plate holding mechanism includes a U-shaped elastic clip body with the end installed on the housing body. The ends of the two elastic rods of the elastic clip body are provided with outward flanging. A longitudinal opening long groove for clamping the elastic clip body is provided on the end wall surface of the chain plate. This improved chain plate installation structure enables the operator to install the end cover of the chain saw without holding the chain plate and the chain anymore, making the installation of the chain plate and the chain simpler and the structure more stable. However, since the elastic clip body is installed on the housing body, the assembly is relatively inconvenient; in addition, in order to maintain stability, the elastic clip body has to be in contact with the chain plate all the time, and there is a large frictional force between the two, which is not conducive to the tensioning operation of the chain plate.

[0005] In view of this, it is necessary to provide an improved chain saw to overcome the defects of the existing technology.

Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a chain saw with a simple structure and easy tensioning.

[0007] The technical solution adopted by the present invention to solve the problems of the prior art is as follows: A chainsaw is provided with a guide plate. The chainsaw includes a main housing, a guard for pressing against the guide plate, a positioning bolt installed on the main housing, and a lock button connected to the positioning bolt. The guide plate includes a through chute. The positioning bolt protrudes outward from the surface of the main housing through the chute and extends into the guard. The chainsaw includes a pressing structure installed on the guard, and the pressing structure abuts against the outer surface of the guide plate.

[0008] A further improvement is that: the pressing structure includes a support member for abutting against the guide plate and an elastic member connected between the support member and the guard. The support member is biased towards the guide plate via the elastic member.

[0009] A further improvement is that: the pressing structure includes an alignment member provided between the guide plate and the support member, and the alignment member protrudes into the chute.

[0010] A further improvement is that: the support member includes a first end away from the guide plate and a second end close to the guide plate. The alignment member protrudes from the second end towards the guide plate and is clamped in the chute.

[0011] A further improvement is that: the alignment member protrudes from the end face of the main housing towards the support member. The support member includes a moving groove penetrating through the second end. The alignment member passes through the chute and extends into the moving groove.

[0012] A further improvement is that: the alignment member is formed on the main housing, and the alignment member and the main housing are an integral component.

[0013] A further improvement is that: the alignment member includes a connecting portion connecting the support member and the main housing and a stop portion provided at the end of the connecting portion. The chainsaw includes a fixing plate pressing against the stop portion and a fixing member for installing the fixing plate to the main housing. The fixing member penetrates between the main housing and the fixing plate to fix the alignment member to the main housing.

[0014] A further improvement is that: the guard includes a receiving groove recessed inward from the end face. The elastic member is received in the receiving groove, and one end of the elastic member abuts against the support member and the other end abuts against the bottom wall of the receiving groove.

[0015] A further improvement is that: the support member includes a main body portion abutting against the guide plate and a limiting portion radially protruding outward from the outer periphery of the main body portion. The limiting portion is located at the first end of the main body portion away from the guide plate, and the limiting portion moves along the inner wall of the receiving groove.

[0016] A further improvement solution is as follows: The support member includes a card slot that is recessed inward from the end surface of the first end, and the elastic member is disposed in the card slot.

[0017] A further improvement solution is as follows: The pressing structure includes a pressing block sleeved on the outer periphery of the main body portion. The pressing block abuts against the limiting portion and is fixed to the protective cover, and the main body portion moves along the pressing block.

[0018] Compared with the prior art, the present invention has the following beneficial effects: By providing the pressing structure on the protective cover, the pressing structure abuts against the outer surface of the guide plate, so that the chain maintains a balanced state before being tensioned, effectively solving the problem of warping of the guide plate during tensioning existing in the current market, and having higher safety; and the pressing structure enables the user to achieve tensioning with one hand, making the operation more convenient. The pressing structure includes the alignment structure, so that when the support member presses against the guide plate, no deviation occurs, and the pressing effect is good; and the alignment structure is clamped in the sliding groove, and can realize the pre-alignment function before the support member contacts the guide plate.

Description of the Drawings

[0019] The following further elaborates on the specific implementation manners of the present invention with reference to the drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of the chain saw of the present invention;

[0021] Figure 2 is Figure 1 A schematic diagram of the structure of the chain saw shown with the protective cover removed;

[0022] Figure 3 is Figure 1 A sectional view of the chain saw shown with the protective cover not locked to the main engine housing;

[0023] Figure 4 is Figure 3 An enlarged view of circle A in the chain saw shown.

[0024] Figure 5 is Figure 3 A sectional view of the chain saw shown with the protective cover locked to the main engine housing;

[0025] Figure 6 is Figure 3 An improved design of the chain saw shown;

[0026] Figure 7 is Figure 6 A sectional view of the chain saw shown with the protective cover locked to the main engine housing.

Specific Embodiments

[0027] The following further elaborates on the present invention in detail with reference to the drawings and embodiments.

[0028] Please refer to Figures 1 to 3 As shown, in the chainsaw 100 of the first embodiment disclosed by the present invention, the chainsaw 100 is equipped with a guide plate 200 and a chain 300 circumferentially mounted on the outer periphery of the guide plate 200. And the chainsaw 100 includes a main housing 1, a guard 2 pressing against the guide plate 200, a positioning bolt 3 mounted on the main housing 1, a lock button 4 connected to the positioning bolt 3, a tensioning structure for adjusting the chain 300, a main handle 11 provided at the rear end of the main housing 1, a front handle 12 provided at the upper end of the main housing 1, and a drive assembly 13 mounted inside the main housing 1. The combination of the main handle 11 and the front handle 12 is suitable for the user to perform two-handed operation; the guide plate 200 protrudes to the front end of the main housing 1. Under the action of an external power source, the drive assembly 13 drives the chain 300 to rotate to perform a cutting operation on wood.

[0029] In this embodiment, the above-mentioned guide plate 200 includes a through chute 201. The chute 201 extends along the front-rear direction and has a certain length. The positioning bolt 3 protrudes outward from the surface of the main housing 1 through the chute 201 and extends into the guard 2. The lock button 4 is mounted on the guard 2. The lock button 4 is threadedly connected to the positioning bolt 3 and locks the guard 2 and the guide plate 200 to be fixed to the main housing 1.

[0030] In this embodiment, the above-mentioned guide plate 200 further includes a through positioning hole 202. The tensioning structure includes a positioning pin 14 fixed to the positioning hole 202 and a dial 15 exposed outside the main housing 1. The positioning pin 14 is connected to the dial 15. Rotating the dial 15 drives the positioning pin 14 to move and drives the guide plate 200 to move along the front-rear direction to perform a tensioning operation on the chain 300.

[0031] Please refer to Figures 3 to 5 As shown, the above-mentioned chainsaw 100 includes a pressing structure mounted on the guard 2. The pressing structure abuts against the outer surface of the guide plate 200, so that the chain 300 maintains a balanced state before being tensioned, effectively solving the problem of warping of the guide plate 200 during tensioning existing in the current market, and having high safety; and the pressing structure enables the user to perform tensioning with one hand, making the operation more convenient.

[0032] Specifically, the above-mentioned pressing structure includes a support member 6 abutting against the guide plate 200, an elastic member 5 connected between the support member 6 and the guard 2, and a pressing block 7 defining the movement range of the support member 6. The support member 6 is biased towards the guide plate 200 via the elastic member 5, so that the support member 6 can always press against the guide plate 200 during the entire process of tensioning the chain 300, preventing the guide plate 200 from warping or loosening, which is beneficial for the tensioning structure to adjust the chain 300.

[0033] In the present embodiment, the above-mentioned shield 2 includes a receiving groove 21 that is recessed inward from the end face. The elastic member 5 is received in the receiving groove 21, and one end of the elastic member 5 abuts against the support member 6, and the other end abuts against the bottom wall of the receiving groove 21.

[0034] In the present embodiment, the above-mentioned elastic member 5 is a spring.

[0035] In the present embodiment, the above-mentioned support member 6 includes a first end away from the guide plate 200, a second end close to the guide plate 200, a main body portion 61 abutting against the guide plate 200, and a limiting portion 62 protruding radially outward from the outer periphery of the main body portion 61. The limiting portion 62 is located at the first end, and the limiting portion 62 moves along the inner wall of the receiving groove 21; the pressing block 7 abuts against the limiting portion 62 and is fixed to the shield 2.

[0036] Please refer to Figure 3 and Figure 5 As shown, the above-mentioned support member 6 moves in the receiving groove 21 against the acting force of the elastic member 5. And when the locking button 4 is not locked to the main housing 1 (before the locking operation starts), the limiting portion 62 abuts against the pressing block 7. Since the pressing block 7 is fixed to the shield 2, the support member 6 will not break away from the receiving groove 21.

[0037] Please refer to Figure 2 As shown, the above-mentioned pressing block 7 is sleeved on the outer periphery of the main body portion 61, and the main body portion 61 moves along the pressing block 7. The pressing block 7 includes a protruding mounting portion 71 and a mounting hole 72 penetrating through the mounting portion 71. A screw passes through the mounting hole 72 to fix the pressing block 7 to the shield 2.

[0038] Please refer to Figure 4 As shown, the above-mentioned support member 6 further includes a clamping groove 63 that is recessed inward from the end face of the first end. The clamping groove 63 is an annular hole. The elastic member 5 is placed in the clamping groove 63. The clamping groove 63 has the function of supporting and guiding, so that the elastic member 5 is not easily offset during the compression process.

[0039] It can be understood that the above-mentioned support member 6 may not be provided with the clamping groove 63, and the elastic member 5 directly abuts against the end face of the first end of the support member 6.

[0040] Please refer to Figures 3 to 5 As shown, the above-mentioned pressing structure further includes an alignment member 8 provided between the guide plate 200 and the support member 6. The alignment member 8 protrudes into the sliding groove 201. The pressing structure includes an alignment structure, so that when the support member 6 presses against the guide plate 200, it will not be offset, and the pressing effect is good; and the alignment structure is clamped in the sliding groove 201, and the pre-alignment function of the support member 6 before contacting the guide plate 200 can be realized.

[0041] In this embodiment, the alignment member 8 protrudes from the end face of the main housing 1 towards the support member 6. The support member 6 includes a moving groove 64 penetrating through the second end. The alignment member 8 passes through the sliding groove 201 and extends into the moving groove 64.

[0042] Please refer to Figure 4 As shown, the alignment member 8 includes a connecting portion 81 connecting the support member 6 and the main housing 1 and a stop portion 82 provided at the end of the connecting portion 81; the chainsaw 100 includes a fixing plate 9 pressing against the stop portion 82 and a fixing member 10 for mounting the fixing plate 9 to the main housing 1. The fixing member 10 is disposed between the main housing 1 and the fixing plate 9 to fix the alignment member 8 to the main housing 1.

[0043] In this embodiment, the fixing plate 9 also presses against the positioning bolt 3 at the same time. The positioning bolt 3 and the alignment member 8 are located on both sides of the fixing member 10 to fix the positioning bolt 3 and the alignment member 8 to the main housing 1 via the fixing member 10 at the same time, so as to optimize the installation structure of the chainsaw 100.

[0044] Please refer to again Figure 6 and Figure 7 As shown, in the second embodiment of the present invention, the overall structure of the chainsaw is substantially the same as that of the chainsaw in the first embodiment, and the difference lies in that: the alignment member 8' is directly formed on the main housing 1', and the alignment member 8' and the main housing 1' are an integral member, that is, the end face of the main housing 1' protrudes towards the support member 6' to form the alignment member 8', so as to simplify the structure of the alignment member 8' and reduce the number of components and assembly steps of the pressing structure.

[0045] In the third embodiment of the present invention, the overall structure of the chainsaw is substantially the same as that of the chainsaw in the first embodiment, and the difference lies in that: the alignment member protrudes from the second end of the support member towards the guide plate and is clamped in the sliding groove. This solution does not require additional structures to be added to the main housing. Only by protruding a clamping structure at the second end of the support member can the function of the alignment member be realized, further optimizing the pressing structure.

[0046] By providing a pressing structure on the guard 2, the pressing structure abuts against the outer surface of the guide plate 200, so that the chain 300 maintains a balanced state before being tensioned, effectively solving the problem of warping of the guide plate 200 during tensioning existing in the current market, and having high safety; and the pressing structure enables the user to perform tensioning with one hand, making the operation more convenient. The pressing structure includes an alignment structure, so that when the support member 6 presses against the guide plate 200, it will not shift, and the pressing effect is good; and the alignment structure is clamped in the sliding groove 201, and can realize the pre-alignment function before the support member 6 contacts the guide plate 200.

[0047] The present invention is not limited to the above specific embodiments. Those of ordinary skill in the art can easily understand that there are many other alternative solutions for the chain saw of the present invention without departing from the principles and scope of the present invention. The protection scope of the present invention shall be subject to the content of the claims.

Claims

1. A chain saw is provided with a guide plate. The chain saw includes a main housing, a guard that presses against the guide plate, a positioning bolt installed on the main housing, and a locking knob connected to the positioning bolt. The guide plate includes a through chute. The positioning bolt protrudes outward from the surface of the main housing through the chute and extends into the guard. It is characterized in that: The chain saw includes a pressing structure installed on the guard, and the pressing structure abuts against the outer surface of the guide plate. The pressing structure includes a support member that abuts against the guide plate, an elastic member connected between the support member and the guard, an alignment member disposed between the guide plate and the support member, and a pressing block that defines the movement range of the support member. The support member is biased toward the guide plate via the elastic member, and the pressing block is fixed to the guard. The support member includes a first end away from the guide plate, a second end close to the guide plate, and a moving groove penetrating the second end. The alignment member protrudes from the end face of the main housing toward the support member. The alignment member protrudes through the chute and extends into the moving groove.

2. The chain saw according to claim 1, It is characterized in that: The alignment member is formed on the main housing, and the alignment member and the main housing are an integral member.

3. The chain saw according to claim 1, It is characterized in that: The alignment member includes a connecting portion connecting the support member and the main housing and a stop portion provided at the end of the connecting portion. The chain saw includes a fixing plate that presses against the stop portion and a fixing member that mounts the fixing plate to the main housing. The fixing member passes through between the main housing and the fixing plate to fix the alignment member to the main housing.

4. The chain saw according to claim 1, It is characterized in that: The guard includes a receiving groove that is recessed inward from the end face. The elastic member is received in the receiving groove, and one end of the elastic member abuts against the support member and the other end abuts against the bottom wall of the receiving groove.

5. The chain saw according to claim 4, It is characterized in that: The support member includes a main body portion that abuts against the guide plate and a limiting portion that radially protrudes outward from the outer periphery of the main body portion. The limiting portion is located at the first end of the main body portion away from the guide plate, and the limiting portion moves along the inner wall of the receiving groove.

6. The chain saw according to claim 5, It is characterized in that: The support member includes a card slot that is recessed inward from the end face of the first end. The elastic member is placed in the card slot.

7. The chain saw according to claim 5, It is characterized in that: The pressing block is sleeved on the outer periphery of the main body portion. The pressing block abuts against the limiting portion, and the main body portion moves along the pressing block.

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