Chain saw

Abstract

The application discloses a chainsaw, comprising: a host housing having a front portion, a rear portion, and a middle portion between the front portion and the rear portion; the motor is accommodated in the middle part of the main machine shell; the guide plate extends forwards from the front part of the host shell; the chain is arranged around the guide plate; the handle is used for being held by a user; the power supply device is at least used for supplying power to the motor; the main machine shell and the handle relatively move in the extending direction of the adjusting device through the adjusting device; the handle center line of the handle is basically parallel to the guide plate center line of the guide plate. The power supply device is located below the center line of the handle.

Description

Technical Field

[0001] The present application relates to a handheld electric tool, in particular to a chain saw. Background Art

[0002] A chainsaw is a commonly used power tool, also known as a pruning machine, which can be used to prune branches or trees. It is usually a portable small or medium-sized chain saw. At present, the cutting height of a portable small or medium-sized chain saw is relatively low and cannot meet the needs of higher cutting heights. A pole saw can meet the needs of high cutting heights, but it does not have the convenience and flexibility of a portable small or medium-sized chain saw. In addition to chainsaws, other handheld power tools, such as electric scissors, lawn mowers, handheld circular saws, etc., also face the situation described above. For portable handheld power tools, users expect them to be small and light while also meeting the needs of different pruning heights.

[0003] This section provides background information related to the present application which is not necessarily prior art. Utility Model Content

[0004] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a chain saw.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] A chain saw comprises: a main body housing, comprising a front portion, a rear portion and a middle portion between the front portion and the rear portion; a motor, housed in the middle portion of the main body housing; a guide plate, extending forward from the front portion of the main body housing; a chain, arranged around the guide plate; a handle, for a user to hold; a power supply device, at least for supplying power to the motor; an adjustment device, through which the main body housing and the handle move relative to each other along the extension direction of the adjustment device; wherein a handle center line of the handle is substantially parallel to a guide plate center line of the guide plate; and the power supply device is located below the handle center line.

[0007] In some embodiments, the handle centerline is in a straight line with the guide plate centerline.

[0008] In some embodiments, the adjustment device includes a telescopic rod assembly that is telescopic and has at least a first state and a second state when it is telescoped along a direction where a first straight line is located; the first straight line is substantially parallel to a center line of the guide plate.

[0009] In some embodiments, the handle has a grip portion; when the telescopic rod assembly is in the first state, the center of gravity of the chain saw is located at the grip portion.

[0010] In some embodiments, when the telescoping rod assembly is in the second state, the center of gravity of the chain saw is located between a guide bar center of the guide bar and a handle center of the handle.

[0011] In some embodiments, the handle has an upper portion and a lower portion, and a joint portion is formed or connected to the lower portion of the handle; the power supply device is detachably connected to the joint portion along the direction of the second straight line, and the second straight line is substantially parallel to the center line of the handle.

[0012] In some embodiments, when the telescopic rod assembly is in the first state, the power supply device and the projection of the telescopic rod assembly on a projection plane perpendicular to the first plane where the guide plate is located at least partially overlap.

[0013] In some embodiments, a bushing is provided at the rear end of the telescopic rod assembly, and a guide rib parallel to the center line of the handle is provided in the handle, and the bushing cooperates with the guide rib to guide the telescopic rod assembly to extend and retract along the direction of the first straight line.

[0014] In some embodiments, the handle has an upper portion and a lower portion; the chain saw further comprises a circuit board assembly disposed in the lower portion of the handle, wherein a centerline of a circuit board of the circuit board assembly is substantially parallel to a centerline of the handle.

[0015] In some embodiments, when the telescopic rod assembly is in the first state, the second plane where the circuit board assembly is located is located below the first straight line, and the projections of the circuit board assembly and the telescopic rod assembly on a projection plane perpendicular to the first plane where the guide plate is located at least partially overlap.

[0016] In some embodiments, the chain saw also includes a movable wire, a fixed wire, and a first switch provided on the handle for starting and stopping the motor; the movable wire is passed through the handle and the adjustment device, electrically connecting the power supply device and the motor; the fixed wire is provided in the handle, electrically connecting the circuit board assembly and the first switch.

[0017] In some embodiments, the chain saw also includes a first switch for starting and stopping the motor and a second switch for locking the start and stop state of the motor. The first switch and the second switch are arranged on the handle, and the second switch is arranged in front of the first switch along the direction of the center line of the handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of a chain saw in a retracted state as an embodiment of the present application;

[0019] Figure 2 yes Figure 1 An exploded view of the chain saw shown;

[0020] Figure 3 yes Figure 1 A perspective view of the chain saw shown in an extended state;

[0021] Figure 4 yes Figure 1 a plan view of the chain saw shown;

[0022] Figure 5 yes Figure 1 A plan view of a portion of the internal structure of the chain saw shown;

[0023] Figure 6 yes Figure 1 A plan view of part of the internal structure of the handle in the chain saw shown;

[0024] Figure 7 yes Figure 1 A plan view of the main body length and handle length of the chain saw shown;

[0025] Figure 8 yes Figure 1 a plan view of a first length of the chain saw;

[0026] Fig. 9 yes Figure 3 a plan view of a second length of the illustrated chain saw;

[0027] Fig.10 yes Figure 1 A plan view of the inner and outer diameters of the handle and the inner and outer diameters of the first connecting rod of the chain saw;

[0028] Fig.11 yes Figure 1 A plan view of the inner and outer diameters of the first connecting rod and the second connecting rod of the chain saw;

[0029] Fig.12 yes Figure 1 A perspective view of the telescopic rod assembly in the chain saw in a first state;

[0030] Fig.13 yes Fig.12 A broken-away cross-sectional view of the telescopic rod assembly in a first state;

[0031] Fig.14 yes Fig.12 Exploded view of the telescopic rod assembly in the first state

[0032] Fig.15 yes Figure 3 A perspective view of the telescopic rod assembly in the chain saw in a second state;

[0033] Fig.16 yes Fig.15 A cross-sectional view of the telescopic rod assembly in a second state;

[0034] Fig.17 yes Fig.15 An exploded view of the telescopic rod assembly shown in a second state;

[0035] Fig.18 yes Figure 1 A three-dimensional view of a first locking assembly in the telescopic rod assembly;

[0036] Fig.19 yes Figure 3 An exploded view of the second locking assembly in the telescopic rod assembly is shown. DETAILED DESCRIPTION

[0037] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0038] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0039] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0040] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0041] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0042] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0043] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0044] In order to meet the needs of some work scenarios, some handheld power tools need to have a telescopic function to adjust the length of the handheld power tool. This telescopic function will optimize and improve the overall feel of the power tool, safety of use, and working effect. Chain saws are a commonly used power tool. Chain saws with telescopic functions can meet the needs of different cutting heights while maintaining the advantages of being small and portable.

[0045] The technical solution proposed in this application is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0046] Figure 1 A chain saw 100 is shown as an embodiment of the present application. Figures 1 to 3As shown, the chain saw 100 includes a main body housing 10, a guide plate 20, a chain 30 and a motor 40. Figure 1 The directions of front, back, upper, lower, left, and right in this application are also defined.

[0047] The main housing 10 has a front portion 111, a rear portion 112, and a middle portion 113 between the front portion 111 and the rear portion 112, and a receiving space is formed in the main housing 10. The guide plate 20 extends forward from the front portion 111 of the main housing 10, and a portion of its rear end is located in the front portion 111 of the main housing 10, and the remaining majority extends out of the front portion 111 of the main housing 10. The guide plate 20 supports the chain 30 arranged around its periphery, and the chain 30 is a functional part of the chain saw 100. In some embodiments, the chain saw 100 further includes a shield 121 that can be detachably connected to the front portion 111 of the main housing 10, and the shield 121 accommodates part of the guide plate 20 and the chain 30, and protects the chain 30 itself and the user's safety.

[0048] The motor 40 is accommodated in the middle portion 113 of the main housing 10. Figure 2 As shown, in this embodiment, the host housing 10 may include a left host housing 114 and a right host housing 115, the left and right host housings may be connected in abutment, and the motor 40 may be accommodated in the middle portion 113 of the right host housing. After the motor shaft of the motor 40 rotates, it may directly or indirectly drive the chain 30 to move around the guide plate 20 to perform a cutting operation through a transmission assembly, and the motor axis may be substantially perpendicular to the first plane 202 where the guide plate 20 is located. In some embodiments, the motor 40 is a brushless DC motor 40 to reduce the size of the motor 40 while maintaining the performance of the motor 40.

[0049] The main body length L3 is defined as the distance between the frontmost side of the front part 111 of the main body housing 10 and the rearmost side of the rear part 112 of the main body housing 10. In some embodiments, in order to take into account the cutting performance and structural arrangement of the telescopic chain saw, the ratio of the output power of the chain saw 100 to the main body length L3 can be greater than or equal to 1.5 W / mm and less than or equal to 3.5 W / mm. Specifically, the output power of the chain saw can be the output power of the motor 40, or the rated power of the motor 40, or the output shaft power that drives the chain 30. In other embodiments, the ratio of the output power of the chain saw 100 to the main body length L3 can be greater than or equal to 2 W / mm and less than or equal to 3 W / mm.

[0050] like Figures 1 to 3 As shown, the chain saw 100 further includes a handle 50 , an adjustment device 60 and a power supply device 70 .

[0051] Among them, the handle 50 is for the user to hold, and has an upper part 511 and a lower part 512, and a accommodating space is formed in the handle 50. The front end of the handle upper part 511 constitutes the handle front end 513, and the rear end of the handle upper part 511 is connected to the handle lower part 512, and the rear ends of the handle upper and lower parts 511, 512 together constitute the handle rear end 514. The handle 50 is located on the rear side of the host housing 10, and the handle front end 513 is close to the rear part 112 of the host housing 10, and the handle rear end 514 is far away from the host housing 10. Between the front and rear ends 513, 514 of the handle is the handle gripping portion 516 that the user actually holds. The cross-section of the handle gripping portion 516 may be quasi-circular or quasi-rectangular, and the handle center line 501 runs through the handle gripping portion 516. As shown Figure 4 , Figure 5 As shown, the handle centerline 501 of the handle 50 is substantially parallel to the guide bar centerline 201 of the guide bar 20 to provide a more stable center of gravity of the telescopic chain saw. In this embodiment, the handle centerline 501 may also coincide with the guide bar centerline 201 and be the same straight line to further stabilize the center of gravity. In other cases, the handle centerline 501 may also be parallel and located above or below the guide bar centerline 201.

[0052] like Figure 7 As shown, the mainframe length L3 is defined as the distance between the frontmost side of the front part 111 of the mainframe housing 10 and the rearmost side of the rear part 112 of the mainframe housing 10, and the handle length L4 is defined as the distance between the front end face 513 of the handle and the rear end face 514 of the handle. In some embodiments, in order to optimize the center of gravity of the telescopic chain saw and improve the feel of the telescopic chain saw, the ratio of the mainframe length L3 to the handle length L4 may be greater than or equal to 0.3 and less than or equal to 0.8. In other embodiments, the ratio of the mainframe length L3 to the handle length L4 may be greater than or equal to 0.4 and less than or equal to 0.7.

[0053] The adjusting device 60 changes its own length to make the main body housing 10 and the handle 50 move relative to each other in the extension direction. The adjusting device 60 has a retracted state and an extended state, and may also include one or more semi-extended states between the retracted state and the extended state. The length of the chain saw 100 in the retracted state is shorter, and the length of the chain saw 100 in the extended state or semi-extended state is longer, and the length of the chain saw 100 in the extended state is greater than the length of the chain saw 100 in the semi-extended state. The adjusting device 60 can be implemented by a plurality of connecting rods that are sequentially sleeved and cooperate with a locking assembly, and its specific structure will be described in detail later. Figure 1 , Figure 4 , Figure 5 As shown, when the adjustment device 60 is in the retracted state, the front end surface 513 of the handle abuts against the rear portion 112 of the main housing 10, and the adjustment device 60 can be accommodated in the handle 50 as a whole, or partially accommodated in the handle 50 and partially accommodated in the main housing 10. Figure 3 , Fig. 9 As shown, when the adjusting device 60 is in the extended state, the front end surface 513 of the handle is separated from the rear portion 112 of the main housing 10, and the adjusting device 60 can be located between the handle 50 and the main housing 10, with part of its rear end located inside the handle 50, part of its front end located inside the rear portion 112 of the main housing 10, and the rest mostly extending outside the handle 50 and the main housing 10.

[0054] The handle 50 is provided with a first switch 52 for user operation. The first switch 52 may be located near the front end surface 513 of the handle. The first switch 52 may be used to control the start or stop of the motor 40, or may be used to control the speed of the motor 40. In this embodiment, the first switch may be a trigger switch 52. The trigger switch 52 may be located near the front end 513 of the handle and rotate around the axis relative to the handle 50. When the chain saw 100 is equipped with the power supply device 70, the torque from the first switch 52 to the frontmost side of the chain 30 is less than or equal to 2.6 N·m. In other cases, the first switch 52 may also be a toggle switch 52 that is toggled in the front-to-back direction or the left-to-right direction.

[0055] The power supply device 70 can at least supply power to the motor 40, so that the motor 40 can drive the chain 30 to move around the guide plate 20. In this embodiment, the power supply device 70 is a battery pack 70, but the power supply device 70 is not limited to a battery pack. The chain saw 100 can also use other power supply forms. In other cases, AC power can also be used in conjunction with related circuits such as voltage conversion, rectification, and voltage stabilization, or a power adapter to achieve power supply. Figure 4 , Figure 5 As shown, the power supply device 70 is located below the handle centerline 501 of the handle 50 and is connected to the handle rear end 514. In this embodiment, the handle lower portion 512 is formed or connected with a joint portion 515, and the battery pack 70 can be detachably connected to the joint portion 515 along the direction of the second straight line 701, and can be inserted into or pulled out of the joint portion 515 along the direction of the second straight line 701. In this embodiment, the second straight line 701 is substantially parallel to the handle centerline 501, for example, the plane where the battery pack 70 is located can be perpendicular to the first plane 202 where the guide plate 20 is located. In other cases, the second straight line 701 can also be at a certain angle to the handle centerline 501.

[0056] In some embodiments, the total weight of the chain saw 100 is less than or equal to 2.5 kg without the power supply device 70. In other embodiments, the total weight of the chain saw 100 is less than or equal to 2 kg without the power supply device 70.

[0057] The chain saw 100 further includes a circuit board assembly 80, which can be used to control the power supply status of the power supply device 70 and the operating status of the motor 40. Figure 4 , Figure 5As shown, the circuit board assembly 80 is disposed in the lower portion 512 of the handle, below the center line 501 of the handle and supported by the handle 50, and the center line 801 of the circuit board assembly 80 may be parallel to the center line 501 of the handle. In some embodiments, the second plane 802 where the circuit board assembly 80 is located may be located entirely below the center line 501 of the handle, and may be perpendicular to the first plane 202 where the guide plate 20 is located.

[0058] The chain saw 100 further includes a fixed line 81 and a movable line 82. The fixed line 81 can electrically connect the circuit board assembly 80 and the first switch 52, and its line position can be fixed and can be a conventional circuit line. Figure 6 As shown, the fixed wire 81 can start from the circuit board assembly 80 in the lower part 512 of the handle, pass through the handle 50 along the wire groove 519 provided on the lower inner wall of the upper part 511 of the handle, and reach the first switch 52 near the front end 513 of the handle. The movable wire 82 can electrically connect the power supply device 70 and the motor 40. Since there is an adjustment device 60 with a variable length between the power supply device 70 and the motor 40, the movable wire 82 can be a spring wire 82, which can follow the adjustment device 60 to expand and contract without affecting the power supply stability, such as Figure 6 As shown, it is inserted between the rear end 614 of the handle and the adjusting device 60 . In some embodiments, when the adjusting device 60 is in a contracted state, the spring wire 82 can be in a pre-stretched state to extend the life of the spring wire 82 .

[0059] A heat dissipation vent 83 is also provided on the shell of the lower portion 512 of the handle near the circuit board assembly 80. The heat dissipation vent 83 can physically dissipate the heat of the circuit board assembly 80. In other cases, the chain saw 100 also includes a fan, which can be installed on the motor shaft and rotate therewith. The adjusting device 60 is designed to be in a highly sealed state. The heat dissipation vent 83 can be an air flow inlet. The heat dissipation airflow generated by the fan can flow through the circuit board assembly 80, the adjusting device 60 and the motor 40 to improve the heat dissipation performance of the telescopic chain saw.

[0060] The handle is also provided with a second switch 53 for user operation. The second switch 53 can lock the motor 40 to maintain the start state or the stop state. In some embodiments, the second switch 53 can be arranged on the upper side of the first switch 52 in the up-down direction. It can be located between the first switch 52 and the telescopic rod assembly 61 in the handle 50. However, the second switch 53 located between the first switch 52 and the telescopic rod assembly 61 will increase the outer diameter D of the handle 50, affecting the user's grip on the handle 50. Figure 6As shown, in this embodiment, the second switch 53 can be arranged in front of the first switch 52 along the front-to-back direction, and the second switch 53 can be located in the handle 50 in front of the first switch 52, at the lower side of the telescopic rod assembly 61, and near the front end 513 of the handle, so as not to increase the outer diameter of the handle 50, thereby improving the hand feeling of the user holding the handle 50. In other embodiments, the second switch 53 also has an inclined surface that is aligned with the position of the user's thumb when the user holds the chain saw 100, so that the user can comfortably place the thumb on the second switch 53.

[0061] The chain saw 100 also includes a support assembly 90, such as Figure 3 , Figure 4 As shown, the support assembly 90 may include a first support member 91 and a second support member 92, wherein the first support member 91 is connected to the main body housing 10 and may be a triangular support angle, and the second support member 92 is connected to the handle 50 and may be a rectangular hand guard. When the chain saw 100 is not equipped with the power supply device 70, the bottom end of the first support member 91 and the front edge of the second support member 92 provide support when placed on a horizontal plane. When the chain saw 100 is equipped with the power supply device 70, the bottom end of the first support member 91 and the bottom surface of the power supply device 70 provide support when placed on a horizontal plane.

[0062] Figures 12 to 17 Shows Figure 1 , Figure 3 The adjusting device 60 in the chain saw 100 is shown. The adjusting device 60 includes a telescopic rod assembly 61, and the telescopic rod assembly 61 has at least a first state and a second state when it is telescoped along the direction of the first straight line 101. The first straight line 101 is substantially parallel to the guide bar centerline 201, that is, the first straight line 101 is substantially parallel to the guide bar centerline 201 and the handle centerline 501, and the telescopic rod assembly 61 is telescoped along the direction of the guide bar centerline 201 or the handle centerline 501. In some embodiments, the first straight line 101, the guide bar centerline 201 and the handle centerline 501 coincide with each other and are the same straight line.

[0063] like Figure 1 , Figure 4 , Figure 5 , Figure 8 As shown, the telescopic rod assembly 61 is in the first state, and the adjustment device 60 is in the retracted state. The length of the chain saw 100 at this time is defined as the first length L1 of the chain saw 100, and the first length L1 is the minimum length value of the chain saw 100 for extension. Figure 3 , Fig. 9As shown, the telescopic rod assembly 61 is in the second state, and the adjusting device 60 is in the extended state. At this time, the length of the chain saw 100 is defined as the second length L2 of the chain saw 100, and the second length L2 is the maximum length value of the chain saw 100. The telescopic rod assembly 61 is in other intermediate states between the first state and the second state, and the adjusting device 60 is in the semi-extended state. At this time, the length of the chain saw 100 is between the first length L1 and the second length L2.

[0064] In some embodiments, in order to take into account both the telescopic function and a good center of gravity, the ratio of the second length L2 to the first length L1 of the chain saw 100 may be greater than or equal to 1.4 and less than or equal to 2.8. In other embodiments, the ratio of the second length L2 to the first length L1 of the chain saw 100 may be greater than or equal to 1.6 and less than or equal to 2.6. In still other embodiments, the first length L1 of the chain saw 100 is less than or equal to 550 mm, and the second length L2 of the chain saw 100 is greater than or equal to 800 mm.

[0065] like Figure 1 , Figure 4 , Figure 5 As shown, when the telescopic rod assembly 61 is in the first state, the telescopic rod assembly 61 is retracted and accommodated in the handle 50. Looking from top to bottom at the rear end 514 of the handle, the housing of the upper handle 511, the telescopic rod assembly 61, the housing of the lower handle 512, and the power supply device 70 are sequentially arranged. The projection of the power supply device 70 and the telescopic rod assembly 61 on the projection plane perpendicular to the first plane 202 where the guide plate 20 is located at least partially overlap. In some embodiments, looking from top to bottom at the rear end 514 of the handle, the housing of the upper handle 511, the telescopic rod assembly 61, the circuit board assembly 80, the housing of the lower handle 512, and the power supply device 70 are sequentially arranged. The projection of the circuit board assembly 80 and the telescopic rod assembly 61 on the projection plane perpendicular to the first plane 202 where the guide plate 20 is located at least partially overlap.

[0066] In this embodiment, when the telescopic rod assembly 61 is in the first state, the center of gravity of the chain saw 100 equipped with the power supply device 70 is located at the handle gripping portion 516, which is basically consistent with the position of the hand base when the user grips the handle in the axial direction of the handle, and the distance between the handle center line 501 in the radial direction of the handle is less than or equal to 10 mm.

[0067] like Figure 3 , Fig. 9As shown, when the telescopic rod assembly 61 is in the second state, the telescopic rod assembly 61 extends out of the handle 50, and the rear end 514 of the handle is viewed from top to bottom, and the housing of the upper handle 511, the housing of the lower handle 512, and the power supply device 70 are sequentially, or the housing of the upper handle 511, the rear end of part of the telescopic rod assembly 61, the housing of the lower handle 512, and the power supply device 70 are sequentially. In some embodiments, when the rear end 514 of the handle is viewed from top to bottom, the housing of the upper handle 511, the circuit board assembly 80, the housing of the lower handle 512, and the power supply device 70 are sequentially, or the housing of the upper handle 511, the rear end of part of the telescopic rod assembly 61, the circuit board assembly 80, the housing of the lower handle 512, and the power supply device 70 are sequentially.

[0068] In this embodiment, when the telescopic rod assembly 61 is in the second state, the center of gravity of the chain saw 100 with the power supply device 70 installed is located between the handle center of the handle 50 and the guide plate center of the guide plate 20 .

[0069] like Fig.12 , Fig.15 As shown, the telescopic rod assembly 61 can be composed of a plurality of connecting rods that are sequentially sleeved, and the telescopic rod assembly 61 includes at least a first connecting rod 611 and a second connecting rod 612. The first connecting rod 611 is a connecting rod that is closer to the handle 50 when the adjustment device 60 is in the extended state, and is slidably connected to the handle 50. The second connecting rod 612 is a connecting rod that is closer to the main housing 10 when the adjustment device 60 is in the extended state, and its front end is fixedly connected to the rear of the main housing 10. In some embodiments, the first and second connecting rods 611 and 612 can be made of aluminum alloy, magnesium alloy or carbon fiber material to improve the feel of the telescopic chain saw 100 without affecting the performance of the telescopic chain saw 100.

[0070] In some embodiments, the first connecting rod 611 and the second connecting rod 612 can be flat tubes or square tubes to enhance the anti-rotation ability of the telescopic rod assembly 61, keep the first and second connecting rods 611, 612 stable in the handle 50, and prevent them from rotating.

[0071] In some embodiments, Figure 6 , Fig.14 , Fig.17As shown, a bushing 64 is provided at the rear end of the first connecting rod 611, and the bushing 64 is clamped with the rear end 514 of the handle to keep the first connecting rod 611 stable in the handle 50. A guide rib 518 parallel to the center line 501 of the handle is also provided on the inner wall of the handle 50. The bushing 64 at the rear end of the first connecting rod 611 and / or the outer wall of the first connecting rod 611 can cooperate with the guide rib 518 to make the first connecting rod 611 telescopic in a direction parallel to the center line 501 of the handle and ensure the stability of the first connecting rod 611 during the telescopic process. The bushing 64 can also abut against the shell of the front end 613 of the handle when the telescopic rod assembly 61 is in the second state to prevent the first connecting rod 611 from detaching from the handle 50. In some other embodiments, the rear end of the second connecting rod 612 may also be provided with a bushing, which is clamped with the inner wall of the first connecting rod 611 to keep the second connecting rod 612 stable inside the first connecting rod 611, and abuts against the second locking assembly 63 to be described later when the telescopic rod assembly 61 is in the second state to prevent the second connecting rod 612 from detaching from the first connecting rod 611.

[0072] like Fig.10 , Fig.11 As shown, the outer diameter D1 of the first connecting rod 611 is smaller than the inner diameter d of the handle, and the outer diameter D2 of the second connecting rod 612 is smaller than the inner diameter d1 of the first connecting rod 611. The following mainly describes the case where the telescopic rod assembly 61 includes the first connecting rod 611 and the second connecting rod 612. In other cases, the telescopic rod assembly 61 may also include the first connecting rod 611, the second connecting rod 612, and at least one intermediate connecting rod, and when the adjustment device 60 is in the extended state, the inner diameter of the connecting rod closer to the handle 50 in the front-to-back direction is larger than the outer diameter of the connecting rod closer to the rear portion 112 of the main housing 10.

[0073] like Fig.10 , Fig.11 As shown, in some embodiments, to improve the feel of the telescopic chain saw 100 and reduce the handle diameter, the ratio of the outer diameter D of the handle 50 to the outer diameter D1 of the first connecting rod 611 can be less than or equal to 1.5, or less than or equal to 1.4, or less than or equal to 1.3. In other embodiments, to improve the feel of the telescopic chain saw 100, the ratio of the outer diameter D1 of the first connecting rod 611 to the outer diameter D2 of the second connecting rod 612 can be less than or equal to 1.5, or less than or equal to 1.4, or less than or equal to 1.3. In still other embodiments, to improve the feel of the telescopic chain saw 100, the outer diameter D of the handle 50 is greater than or equal to 35 mm and less than or equal to 40 mm, and the outer diameter D1 of the first connecting rod 611 is greater than or equal to 25 mm and less than or equal to 30 mm.

[0074] The adjusting device 60 further includes a first locking assembly 62 and a second locking assembly 63. The first locking assembly 62 is used to lock the handle 50, the first connecting rod 611, the second connecting rod 612 and the main housing 10 when the telescopic rod assembly 61 is in the first state, so that the first and second connecting rods 611, 612 remain in a state of being contracted and accommodated in the handle 50 and the front end 513 of the handle is tightly against the rear portion 112 of the main housing 10 in the first state. The first locking assembly 62 is also used to lock the handle 50 and the first connecting rod 611 when the telescopic rod assembly 61 is in the second state, so that the first connecting rod 611 remains in a state of extending out of the front end 513 of the handle in the second state. The second locking assembly 63 is used to lock the first connecting rod 611 and the second connecting rod 612 when the telescopic rod assembly 61 is in the second state, so that the second connecting rod 612 remains in a state of extending out of the front end 513 of the handle in the second state.

[0075] like Fig.14 , Fig.17 , Fig.18 As shown, in some embodiments, the first locking assembly 62 is connected to the inner wall of the handle 50. In this embodiment, the first locking assembly 62 includes a first protective plate 621 fixedly connected to the inner wall of the handle 50, a first rocker plate 623 rotatably connected to the first protective plate 621 through a first rotating shaft 622, and a return torsion spring 624 that is arranged on the first rotating shaft 622 and connected to the first rocker plate 623. A first locking hole 611a is provided at the front end of the first connecting rod 611, and a second locking hole 612a is provided at the front end of the second connecting rod 612. When the telescopic rod assembly 61 is in the first state, the first and second locking holes 611a and 612a are aligned, and one end of the first rocker plate 623 penetrates and is inserted into the first and second locking holes 611a and 612a to achieve position locking of the first and second connecting rods 611 and 612. The rear end of the first connecting rod 611 is further provided with a third locking hole 611b, and when the telescopic rod assembly 61 is in the second state, one end of the first rocker plate 623 is inserted into the third locking hole 611b to achieve position locking of the first connecting rod 611. In some embodiments, the first rocker plate 623 points to the center of the cross section of the handle grip portion 516 when inserted into the locking hole.

[0076] like Fig.14 , Fig.17 , Fig.19As shown, in some embodiments, the second locking assembly 63 is connected to the outer wall of the first connecting rod 611. In this embodiment, the second locking assembly 63 includes a second protective plate 631 fixedly connected to the outer wall of the first connecting rod 611, a second rocker plate 633 rotatably connected to the second protective plate 631 through a second rotating shaft 632, and a resistance spring 634 sandwiched between the second protective plate 631 and the second rocker plate 633. The front end of the first connecting rod 611 is also provided with a fifth locking hole 611c, and the rear end of the second connecting rod 612 is also provided with a fourth locking hole 612b. When the telescopic rod assembly 61 is in the second state, one end of the second rocker plate 633 penetrates and is inserted into the fourth and fifth locking holes 612b and 611c to achieve position locking of the first and second connecting rods 611 and 612. In some embodiments, when the second rocker plate 633 is inserted into the locking hole, it points to the center of the cross section of the handle gripping portion 516. In some embodiments, the second protective plate 631 may be annular and form a closed space on the outer wall of the first connecting rod 611, and the closed space accommodates the second rocker plate 633, the resistance spring 634, etc., which can achieve a dust-proof effect and avoid interference from branch debris during cutting operations.

[0077] In order to avoid mutual interference between the first and second locking components 62 and 63, the third straight line where the first, second and third locking holes 611a, 612a and 611b are located does not overlap with the fourth straight line where the fourth and fifth locking holes 612b and 611c are located. For example, the first, second and third locking holes 611a, 612a and 611b can be arranged on the left inner wall or the right inner wall of the first and second connecting rods 611 and 612, and the fourth and fifth locking holes 612b and 611c can be arranged on the upper inner wall or the lower inner wall of the first and second connecting rods 611 and 612, and vice versa.

[0078] In some embodiments, the first rocker plate 623 and the second rocker plate 633 may be square rockers, and the locking holes may be correspondingly square locking holes, so that the locking between the rockers and the locking holes is more stable.

[0079] The handle 50 is provided with an adjustment switch 54 for user operation. The adjustment switch 54 can be arranged at the front end 513 of the handle, near the handle grip portion 516, and is used to enable or disable the first locking assembly 62. Specifically, the adjustment switch 54 can include a button 54. When the button 54 is triggered, pressure can be applied to the non-insertion end of the first rocker 623 to allow the first rocker 623 to rotate around the axis so that its insertion end can be disengaged from the locking hole.

[0080] like Figure 6 As shown, a limit block 517 is provided on the inner wall of the handle 50. The limit block 517 can be provided near the front end surface 513 of the handle to enable or disable the second locking assembly 63. Specifically, when the limit block 517 is triggered, it can abut against the second rocker 633 and compress the resistance spring 634 to allow the second rocker 633 to rotate around the axis, and its insertion end can be disengaged from the locking hole.

[0081] The following first describes the extension process of the chain saw 100 when the telescopic rod assembly 61 changes from the first state to the second state.

[0082] Assuming that the current telescopic rod assembly 61 is in the first state, the insertion end of the first rocker 623 is inserted through the first and second locking holes 611a and 612a. When the user presses the button 54 to apply pressure to the non-insertion end of the first rocker 623, the first rocker 623 rotates around the first rotating shaft 622, and its insertion end disengages from the first and second locking holes 611a and 612a. If the limit block 517 is set to be in the first state as the trigger state, that is, the position of the limit block 517 in the first state is in the position of abutting the second rocker 633 and the compression resistance spring 634, and the insertion end of the second rocker 633 is not inserted into the fifth locking hole 611c, then after the insertion end of the first rocker 623 is disengaged from the first and second locking holes 611a and 612a, the user can directly pull out the first and second connecting rods 611 and 612, and whether the connecting rod that extends out of the handle first is the first connecting rod 611 or the second connecting rod 612 is determined by the friction between the handle and the first connecting rod 611, and between the first connecting rod 611 and the second connecting rod 612.

[0083] When the first and second connecting rods extend out of the handle in sequence, the second rocker 633 abuts against the limit block 517 or the outer wall of the second connecting rod 612 and compresses the resistance spring 634. The second rocker 633 remains not inserted into the fifth locking hole 611c, or is inserted into the fifth locking hole 611c but not inserted into the fourth locking hole 612b, until the first and second connecting rods 611 and 612 are fully extended out of the handle 50. After the second rocker 633 moves to the fourth locking hole 612b, it is driven by the resistance spring 634 to penetrate the fourth and fifth locking holes 612b and 611c. After the first rocker 623 moves to the third locking hole 611b, it is driven by the return torsion spring 624 to insert into the third locking hole 611b, and the telescopic rod assembly 61 reaches the second state.

[0084] If the limit block 517 is set to a non-triggered state when the telescopic rod assembly 61 is in the first state, that is, the position of the limit block 517 in the first state is not in a position abutting the second rocker 633 and the compression resistance spring 634, and the insertion end of the second rocker 633 is inserted into the fifth locking hole 611c, then after the insertion end of the first rocker 623 is disengaged from the first and second locking holes 611a and 612a, the user can stretch the first connecting rod 611 or the second connecting rod 612.

[0085] When the first connecting rod 611 is stretched first, the force applied by the user causes the limit block 517 to be triggered, and the insertion end of the second rocker 633 first disengages from the fifth locking hole 611c, so that the first connecting rod 611 is able to extend out of the handle, and then the second rocker 633 abuts against the outer wall of the second connecting rod 612 and compresses the resistance spring 634, and the second rocker 633 remains inserted into the fifth locking hole 611c but not into the fourth locking hole 612b, until the first and second connecting rods 611 and 612 are completely extended out of the handle 50, and the second rocker 633 moves to the fourth locking hole 612b and is driven by the resistance spring 634 to penetrate the fourth and fifth locking holes 612b and 611c, and the first rocker 623 moves to the third locking hole 611b and is driven by the return torsion spring 624 to insert into the third locking hole 611b, and the telescopic rod assembly 61 reaches the second state.

[0086] When the second link 612 is stretched first, the limit block 517 limits the extension of the first link 611, and the second rocker 633 remains inserted into the fifth locking hole 611c but not inserted into the fourth locking hole 612b until the second rocker 633 moves to the fourth locking hole 612b, and the second rocker 633 penetrates and inserts into the fourth and fifth locking holes 612b and 611c, and the first rocker 623 is inserted into the first locking hole 611a. Before reaching the second state, the telescopic rod assembly 61 can reach a third state in which the second link 612 extends out of the handle 50 and the first link 611 is contracted and accommodated in the handle 50. The third state is a semi-extended state of the adjusting device 60, and then the user can stretch the first link 611 again. The specific process of subsequently reaching the second state can refer to the relevant description above and will not be repeated here.

[0087] The following describes the retraction process of the chain saw 100 when the telescopic rod assembly 61 changes from the second state to the first state.

[0088] Assuming that the telescopic rod assembly 61 is currently in the second state, the insertion end of the first rocker plate 623 is inserted into the third locking hole 611b, and the insertion end of the second rocker plate 633 is inserted through the fourth and fifth locking holes 612b and 611c. When the user presses the button 54 to apply pressure to the non-insertion end of the first rocker plate 623, the first rocker plate 623 rotates around the axis and its insertion end is disengaged from the third locking hole 611b, and the first connecting rod 611 is able to retract into the handle 50 until the first rocker plate 623 moves to the first locking hole 611c. The limiting block 517 on the inner wall of the handle 50 enters the trigger state, which abuts the second rocker 633 and compresses the resistance spring 634 so that the insertion end of the second rocker 633 disengages from the fourth and fifth locking holes 612b and 611c, and the second connecting rod 612 is able to retract into the handle 50 until the first rocker 623 moves to the second locking hole 612a, and the first rocker 623 is inserted through the first and second locking holes 611a and 612a, and the telescopic rod assembly 61 reaches the first state.

[0089] In some embodiments, the adjusting device 60 may also include other forms and more numbers of locking components, the telescopic rod assembly 61 may also include an intermediate connecting rod, and each connecting rod may be provided with a more number of locking holes, so that the locking assembly and the telescopic rod assembly can cooperate to achieve stepless adjustment of the adjusting device 60, and the length of the adjusting device 60 can be locked at any length value within the length range during the adjustment process.

[0090] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A chain saw comprising: A host housing having a front portion, a rear portion, and a middle portion between the front portion and the rear portion; A motor, housed in the middle portion of the main housing; a guide plate extending forward from the front portion of the host housing; a chain, arranged around the guide plate; A handle for the user to hold; A power supply device, at least used to supply power to the motor; An adjusting device, through which the main body housing and the handle move relatively along the extending direction of the adjusting device; It is characterized in that the adjusting device includes a telescopic rod assembly, and the telescopic rod assembly has at least a first state and a second state when it is telescoped along the direction of the first straight line. When the telescopic rod assembly is in the second state, the center of gravity of the chain saw is located between the guide plate center of the guide plate and the handle center of the handle.

2. The chain saw according to claim 1, characterized in that The handle has a gripping portion; when the telescopic rod assembly is in the first state, the center of gravity of the chain saw is located at the gripping portion.

3. The chain saw according to claim 1, characterized in that: When the telescopic rod assembly is in the first state, the telescopic rod assembly is at least partially accommodated in the handle.

4. The chain saw according to claim 1, characterized in that The handle has an upper part and a lower part, and the lower part of the handle forms or is connected with a joint part; the power supply device is detachably connected to the joint part along the direction of the second straight line, and the second straight line is basically parallel to the center line of the handle.

5. The chain saw according to claim 4, characterized in that When the telescopic rod assembly is in the first state, the power supply device and the projection of the telescopic rod assembly on a projection plane perpendicular to the first plane where the guide plate is located at least partially overlap.

6. The chain saw according to claim 1, characterized in that: A bushing is provided at the rear end of the telescopic rod assembly, and a guide rib parallel to the center line of the handle is provided in the handle. The bushing cooperates with the guide rib to guide the telescopic rod assembly to extend and retract along the direction of the first straight line.

7. The chain saw according to claim 1, characterized in that The handle has an upper part and a lower part; the chain saw also includes a circuit board assembly arranged in the lower part of the handle; when the telescopic rod assembly is in the first state, the second plane where the circuit board assembly is located is located below the first straight line, and the projection of the circuit board assembly and the telescopic rod assembly on a projection plane perpendicular to the first plane where the guide plate is located at least partially overlap.

8. The chain saw according to claim 7, characterized in that The chain saw also includes a movable wire, a fixed wire, and a first switch arranged on the handle for starting and stopping the motor; the movable wire is passed through the handle and the adjustment device, electrically connecting the power supply device and the motor; the fixed wire is arranged in the handle, electrically connecting the circuit board assembly and the first switch.

9. The chain saw according to claim 7, characterized in that The lower part of the handle also has a heat dissipation port close to the circuit board assembly, and the heat dissipation airflow flows through the circuit board assembly, the adjustment device and the motor.

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