chain saw

Abstract

The application provides a chain saw, which comprises a housing, a driving system installed on the housing, a guide plate extending outward from the housing, a chain arranged on the guide plate and driven by the driving system, and a tensioning assembly capable of tensioning the chain. The tensioning assembly comprises an operating member and a driving member driven by the operating member. The driving member cooperates with the guide plate to drive the driving member and move the guide plate to tension the chain when a driving force is applied on the operating member. After the chain is tensioned, the driving force is continuously applied on the operating member, and the operating member is decoupled from the driving member. The operating member continues to move to press the guide plate. Compared with the prior art, the chain saw of the application is convenient to use, simple in structure and low in production and use cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a chain saw, in particular to a chain tensioning structure of the chain saw. BACKGROUND

[0002] The chain saw is a gardening tool which cuts wood or branches by high-speed rotation of a chain with blades. If the chain of the chain saw is not properly tensioned, it may come off the guide plate and cause injury to the operator; if the chain is too tight, it may cause high-temperature failure due to excessive friction between the chain and the guide plate. During use, the tension of the chain will change considerably due to wear of the chain, and the length of the chain will gradually increase and the tension will gradually decrease after a period of use.

[0003] In order to use the chain saw safely and efficiently, the tension of the chain must be maintained at all times, and therefore it is necessary to provide a chain tensioning device. There are generally two ways of tensioning the chain and locking the guide plate of the chain saw on the market: one is to use an external tool for adjustment, which is primitive and inconvenient; the other is to use the adjustment mechanism provided with the chain saw, but it needs to be completed manually in different ways, and such a tensioning process is complicated and inconvenient to operate, and the adjustment mechanism is complex, resulting in high production and maintenance costs.

[0004] Therefore, it is necessary to improve the existing chain tensioning structure to solve the above problems. SUMMARY

[0005] The present application aims to provide a chain saw which can not only tension the chain but also fasten the guide plate, thereby facilitating use of the user, and has a simple structure and can reduce production and use costs.

[0006] To achieve the above-mentioned purpose, the present application provides a chain saw, comprising a housing, a driving system mounted on the housing, a guide plate extending outwardly from the housing, a chain provided on the guide plate and driven by the driving system, and a tensioning assembly capable of tensioning the chain, the tensioning assembly comprising an operating member and a driving member driven by the operating member, the driving member cooperating with the guide plate to drive the driving member and move the guide plate to tension the chain when a driving force is applied to the operating member, and the operating member and the driving member are decoupled when the chain is tensioned, and the operating member continues to move to press the guide plate when the driving force continues to be applied to the operating member.

[0007] As a further improvement of the present application, the tensioning assembly further comprises a pin mounted on the operating member and cooperating with the driving member, and the operating member drives the driving member to move through the pin.

[0008] As a further improvement of the present application, the tensioning assembly further comprises an elastic member elastically abutting between the pin and the operating member, the elastic member providing a matching force between the pin and the driving member.

[0009] As a further improvement of the present application, the operating member is provided with a receiving groove receiving the elastic member and the pin, the pin being partially received in the receiving groove, and the portion of the pin extending out of the receiving groove matching the driving member.

[0010] As a further improvement of the present application, the tensioning assembly further comprises a bracket, the bracket and the operating member jointly fixing the elastic member and the pin in the receiving groove.

[0011] As a further improvement of the present application, the driving member is provided with a groove II matching the pin, the number of the groove II being one time or more than one time of the number of the pin.

[0012] As a further improvement of the present application, the chain saw further comprises a tensioning device matching and being driven by the driving member to tension the chain, the tensioning device comprising a tensioning block, a guide shaft, a return spring and a pressing block, the tensioning block and the return spring being arranged on the guide shaft, and the extension direction of the guide shaft being parallel to the moving direction of the guide plate.

[0013] As a further improvement of the present application, the tensioning block is provided with two or more than two protrusions, and the driving member is provided with an arc-shaped track matching the protrusions to drive the tensioning device.

[0014] As a further improvement of the present application, the protrusions are provided with two, and the guide plate is provided with a through hole and a long hole, one of the protrusions matching the through hole and the other protrusion matching the long hole. It is to be noted that the long hole is preferably an oblong hole, but is not limited to the oblong hole, as long as the technical solution of the present application can be realized, for example, a rectangular hole or a parallelogram hole; the shape of the through hole is preferably a circular hole, but is not limited to the circular hole, as long as the technical solution of the present application can be realized, for example, a quadrilateral hole, a pentagonal hole, a hexagonal hole, a plum blossom hole or a cross hole, and a plurality of through holes can also be arranged, the shapes of the through holes can be the same or different.

[0015] As a further improvement of the present application, the housing is provided with a screw rod, and the tensioning assembly matches the screw rod to clamp the guide plate while tensioning the chain when the operating member is operated.

[0016] The chain saw of the present application has the following beneficial effects: the chain saw of the present application utilizes the cooperation between the operating member and the driving member, so that when the driving force is applied on the operating member, the driving member can drive the guide plate to move and tension the chain; after the chain is tensioned, the driving force is continuously applied on the operating member, at this time, the operating member is decoupled from the driving member, and the operating member continues to move to press the guide plate. Compared with the prior art, the chain saw of the present application is not only convenient for the user to use, but also simple in structure and can reduce the production and use cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of the chain saw of the present application.

[0018] Figure 2 is Figure 1 a partial exploded view of the chain saw shown in

[0019] Figure 3 is Figure 2 an exploded view of the tensioning assembly in

[0020] Figure 4 is Figure 3 another perspective exploded view of the tensioning assembly shown in

[0021] Figure 5 is Figure 4 a side view of the pin and the elastic member in

[0022] Figure 6 is Figure 3 a perspective view of the pin and the elastic member in cooperation with the driving member.

[0023] Figure 7 is Figure 2 a perspective view of the tensioning device in

[0024] Figure 8 is Figure 7 an exploded view of DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and effects of the present application more clear and explicit, the present application is further described in detail below with reference to the accompanying drawings and examples.

[0026] As Figure 1 and Figure 2As shown in the drawings, the present application discloses a chain saw 100, which comprises a housing 1, a driving system 3 mounted on the housing 1, a sprocket 4 driven by the driving system 3 and supported in the housing 1, a guide plate 5 extending outwardly from the housing 1, a side cover 6 cooperating with the housing 1 to jointly clamp the guide plate 5, a chain 2 disposed on the guide plate 5 and capable of being driven by the driving system 3 to make reciprocating motion, and a tensioning assembly 7 for tensioning the chain 2. Of course, the chain saw 100 also comprises some other structures mounted on the housing 1, such as a rear handle, a front handle, a guard plate, a power supply unit, a trigger, etc., which can be designed according to the prior art, and thus will not be described in detail here.

[0027] The sprocket 4 is used to drive the chain 2 to move, in other words, one end of the chain 2 is sleeved on the sprocket 4 and the other end is sleeved on the guide plate 5, so that when the driving system 3 drives the sprocket 4 to rotate, the chain 2 can be driven to make reciprocating motion and the guide plate 5 can move forward and backward. The side cover 6 covers the outer side of the guide plate 5 to prevent the guide plate 5 from shaking in a direction perpendicular to the guide plate 5 during movement. In this embodiment, the driving system 3 is a motor, but it should not be limited thereto.

[0028] One end of the guide plate 5 is supported on the housing 1 and the other end extends longitudinally outwardly from the housing 1 to support and guide the chain 2. One end of the guide plate 5 supported on the housing 1 is provided with an elongated hole 511 extending along the longitudinal direction of the guide plate 5 and located substantially at the middle position of the guide plate 5 in the vertical direction, and two through holes 512 are symmetrically distributed on both sides of the elongated hole 511 in the vertical direction.

[0029] It should be noted that the elongated hole 511 is preferably an oblong hole, but it is not limited to an oblong hole, and any shape can be used as long as the technical solution of the present application can be realized, for example, a rectangular hole or a parallelogram hole; the shape of the through hole 512 is preferably circular, but it is not limited to a circular hole, and any shape can be used as long as the technical solution of the present application can be realized, for example, a quadrilateral hole, a pentagonal hole, a hexagonal hole, a plum blossom hole or a cross hole, and the shapes of the two through holes 512 can be the same or different.

[0030] As shown in the drawings, Figures 3 to 6 and in combination with Figure 2 As shown in the drawings, the tensioning assembly 7 can realize both tensioning and locking functions of the chain 2. The tensioning assembly 7 comprises an operating member 71, a driving member 72 capable of being driven by the operating member 71, at least one pin 74 mounted on the operating member 71 and cooperating with the driving member 72, and an elastic member 741 elastically abutting between the pin 74 and the operating member 71. A user can apply a driving force to the operating member 71 to drive the driving member 72 to move through the pin 74 and the elastic member 741, and then drive the guide plate 5 to move to tension the chain 2.

[0031] The elastic member 741 is used to provide elastic cooperation force between the pin 74 and the driving member 72 and the operating member 71. The operating member 71 is provided with a receiving groove 712 for receiving the elastic member 741 and the pin 74, the pin 74 is partially received in the receiving groove 712, and the part of the pin 74 extending out of the receiving groove 712 cooperates with the driving member 72. The elastic member 741 is completely received in the receiving groove 712, one end of the elastic member 741 abuts against the operating member 71, and the other end abuts against the pin 74, so as to provide cooperation force between the pin 74 and the operating member 71.

[0032] The tensioning assembly 7 further comprises a bracket 75, which, together with the operating member 71, fixes and receives the elastic member 741 and the pin 74 in the receiving groove 712. The driving member 72 is provided with a groove two 722 cooperating with the pin 74, the number of the groove two 722 is one time or more than the number of the pin 74. The operating member 71 is provided with a threaded column 711 at the middle position, the receiving groove 712 is provided with four and uniformly distributed outside the threaded column 711, so as to receive four elastic members 741 and four pins 74. The threaded column 711 is installed with a check ring 73.

[0033] In the embodiment, the tensioning assembly 7 is installed on the side cover 6, and the operating member 71 is a knob which can be rotated and operated. The driving member 72 is a rotating disc which can be driven to rotate by the operating member 71, one side of the driving member 72 is provided with a circular arc track 721. The elastic member 741 is a compression spring, and the pin 74 is sleeved on the elastic member 741. The number of the pin 74 and the elastic member 741 is four, and they are uniformly distributed on the circumference of the operating member 71 and abut against the threaded column 711 respectively. The bracket 75 is fixed on the operating member 71 by bolts (not shown) to fix the pin 74 and the elastic member 741 in the receiving groove 712.

[0034] As Figure 7 With Figure 8 And in combination Figure 2As shown, the chain saw 100 further comprises a tensioning device 8 cooperating with the driving member 72 and being driven by the driving member 72 to tension the chain 2. The tensioning device 8 comprises a tensioning block 81, a guide shaft 82, a return spring 83 and a pressing block 84, the tensioning block 81 and the return spring 83 being arranged on the guide shaft 82, and the extension direction of the guide shaft 82 being parallel to the moving direction of the guide plate 5. The tensioning block 81 is provided with two or more than two protrusions, in this embodiment, two protrusions are provided, which are defined as a first protrusion 811 and a second protrusion 812. The first protrusion 811 cooperates with the through hole 512 of the guide plate 5, the second protrusion 812 cooperates with the long hole 511 of the guide plate 5, and the arc-shaped track 721 of the driving member 72 cooperates with the second protrusion 812 to drive the tensioning device 8.

[0035] The housing 1 is provided with a boss 101 and a screw rod 102 penetrating through the boss 101, the tensioning device 8 is fixed on the boss 101, and the tensioning assembly 7 is inserted on the screw rod 102 to rotate with the screw rod 102. Specifically, the boss 101 is recessed with a groove one 103, the tensioning block 81 and the return spring 83 are sleeved on the guide shaft 82, and the guide shaft 82 is limited in the groove one 103 of the boss 101 by the pressing block 84. The threaded column 711 is a hollow structure with threads inside, and the screw rod 102 penetrates through the long hole 511 of the guide plate 5 during assembly, so that the internal threads of the threaded column 711 rotate with the screw rod 102. The side cover 6 is assembled to the housing 1 along the screw rod 102, so that the guide plate 5 can be moved by the screw rod 102 and the first protrusion 811 when the operating member 71 is rotated, thereby realizing the tensioning of the chain 2, and at the same time, the locking of the guide plate 5 is realized.

[0036] When assembling the guide plate 5 and the chain 2, the guide plate 5 is first assembled to the boss 101 along the longitudinal direction of the housing 1, and the screw rod 102 and the second protrusion 812 penetrate through the long hole 511 of the guide plate 5, and the first protrusion 811 penetrates through the through hole 512; then the chain 2 is assembled to the chain wheel 4 and the guide plate 5.

[0037] When the chain 2 is tensioned, if the operation member 71 is continuously rotated, the movement of the tensioning device 8 is resisted, when the resistance reaches the set value, the driving member 72 no longer continues to rotate, and the driving member 72 compresses the elastic member 741 through the pin 74, until the driving member 72 is disconnected from the operation member 71, that is, the rotating force applied to the pin 74 by the operation member 71 is greater than the resistance applied to the pin 74 by the driving member 72, at this time, the pin 74 moves from one groove two 722 to another groove two 722, producing a click sound. Continue to rotate the operation member 71, the threaded column 711 continues to rotate with the screw rod 102, and the side cover 6 is pressed against the boss 101 by rotating the operation member 71, so as to achieve the purpose of pressing the guide plate 5.

[0038] In summary, the chain saw 100 of the present application utilizes the cooperation between the operation member 71 and the driving member 72, so that when the driving force is applied to the operation member 71, the driving member 72 can drive the guide plate 5 to move and then tension the chain 2; after the chain 2 is tensioned, if the driving force is continuously applied to the operation member 71, the operation member 71 is disconnected from the driving member 72, at this time, the pressing of the guide plate 5 can be realized. Compared with the prior art, the chain saw 100 of the present application not only facilitates the user to use, but also has simple structure and can reduce the production and use cost.

[0039] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A chainsaw, comprising a housing, a drive system mounted on the housing, a guide plate extending outward from the housing, a chain disposed on the guide plate and driven by the drive system, and a tensioning assembly for tensioning the chain, characterized in that: The tensioning assembly includes an operating member and a driving member that can be driven by the operating member. The driving member cooperates with the guide plate to drive the driving member and move the guide plate to tension the chain when a driving force is applied to the operating member. After the chain is tensioned, the driving force continues to be applied to the operating member. At this time, the operating member disengages from the driving member, and the operating member continues to move to press the guide plate. The tensioning assembly is rotatably engaged with the screw on the housing, and the operating member drives the driving member to move through the pin. The pin has an elastic engagement force with the driving member and the operating member. The chainsaw also includes a tensioning device that cooperates with the drive member and can be driven by the drive member to tension the chain. The tensioning device includes a tensioning block with a first protrusion and a second protrusion. The first protrusion cooperates with a through hole in the guide plate, and the second protrusion cooperates with an elongated hole in the guide plate. The drive member has an arc-shaped track that cooperates with the second protrusion to drive the tensioning device. The arc-shaped track drives the second protrusion to move along the elongated hole, thereby moving the guide plate.

2. The chainsaw according to claim 1, characterized in that: The tensioning assembly also includes the pin, which is mounted on the operating member and cooperates with the driving member.

3. The chainsaw according to claim 2, characterized in that: The tensioning assembly further includes an elastic element that resiliently rests between the pin and the actuating member, the elastic element providing a cooperating force between the pin and the driving member.

4. The chainsaw according to claim 3, characterized in that: The operating member is provided with a receiving groove for receiving the elastic member and the pin, the pin is partially received in the receiving groove, and the portion of the pin extending out of the receiving groove cooperates with the driving member.

5. The chainsaw according to claim 4, characterized in that: The tensioning assembly also includes a bracket, which, together with the operating element, secures the elastic element and the pin within the receiving groove.

6. The chainsaw according to claim 2, characterized in that: The driving component is provided with a second groove that mates with the pin, and the number of the second grooves is one or more times the number of the pins.

7. The chainsaw according to claim 1, characterized in that: The tensioning device further includes a guide shaft, a return spring, and a pressing block. The tensioning block and the return spring are disposed on the guide shaft, and the extending direction of the guide shaft is parallel to the moving direction of the guide plate.

8. The chainsaw according to claim 1, characterized in that: The tensioning assembly cooperates with the screw so that when the operating component is operated, the guide plate is clamped while the chain is tensioned.

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