CN220606665U - Chain saw - Google Patents

Abstract

The application discloses a chain saw, include: a main body case having a front portion, a rear portion, and an intermediate portion between the front portion and the rear portion; the motor is arranged in the middle part of the host shell; a guide plate extending from a front of the main body case; a chain disposed around the guide plate; the handle is used for being held by a user and is provided with a front end face and a rear end face; the host shell and the handle relatively move along the extending direction of the adjusting device through the adjusting device; the ratio of the length of the host shell to the length of the handle is more than or equal to 0.3 and less than or equal to 0.8, the length of the host is the distance from the forefront side to the rearmost side of the front part of the host shell, and the length of the handle is the distance from the front end face to the rear end face of the handle.

Description

Chain saw

Technical Field

The present application relates to a hand-held power tool, and in particular to a chain saw.

Background

Chainsaws are a commonly used power tool, also known as a pruner, that is used to prune branches or trees, which is typically a portable small or medium-sized chainsaw. At present, the portable small-sized or medium-sized chain saw has lower cutting height, cannot be suitable for the requirement of higher cutting height, and the rod saw can meet the requirement of high cutting height, but does not have the convenience and flexibility of the portable small-sized or medium-sized chain saw. In addition to chain saws, other hand-held power tools such as electric shears, lawnmowers, hand-held circular saws, etc. are also faced with the above described situation. For portable hand-held power tools, users desire to have a compact and lightweight feature while also meeting the needs of different clipping heights.

This section provides background information related to the present application, which is not necessarily prior art.

Disclosure of Invention

It is an object of the present application to solve or at least mitigate some or all of the above problems. To this end, it is an object of the present application to provide a chain saw.

In order to achieve the above object, the present application adopts the following technical scheme:

a chain saw, comprising: a main body case having a front portion, a rear portion, and an intermediate portion between the front portion and the rear portion; the motor is arranged in the middle part of the host shell; a guide plate extending from a front of the main body case; a chain disposed around the guide plate; the handle is used for being held by a user and is provided with a front end face and a rear end face; the host shell and the handle relatively move along the extending direction of the adjusting device through the adjusting device; the ratio of the length of the host shell to the length of the handle is more than or equal to 0.3 and less than or equal to 0.8, the length of the host is the distance from the forefront side to the rearmost side of the front part of the host shell, and the length of the handle is the distance from the front end face to the rear end face of the handle.

In some embodiments, the ratio of the length of the host to the length of the handle is greater than or equal to 0.4 and less than or equal to 0.7.

In some embodiments, the ratio of the output power of the chainsaw to the length of the main machine is greater than or equal to 1.5W/mm and less than or equal to 3.5W/mm.

In some embodiments, the adjustment device comprises a telescopic rod assembly that is telescopic along a first line in a direction having at least a first state or a second state.

In some embodiments, the ratio of the second length of the chainsaw in the second state to the first length in the first state is greater than or equal to 1.4 and less than or equal to 2.8.

In some embodiments, the second length of the chainsaw in the second state is greater than or equal to 800mm.

In some embodiments, the telescoping rod assembly comprises at least a first link and a second link, the inner diameter of the handle being greater than the outer diameter of the first link, the inner diameter of the first link being greater than the outer diameter of the second link.

In some embodiments, the ratio of the outer diameter of the handle to the outer diameter of the first link is less than or equal to 1.5.

In some embodiments, the handle has an outer diameter of 35mm or greater and 40mm or less and the first link has an outer diameter of 25mm or greater and 30mm or less.

In some embodiments, the ratio of the outer diameter of the first link to the outer diameter of the second link is less than or equal to 1.5.

In some embodiments, the weight of the chain saw is 2.5kg or less.

The beneficial effects of this application lie in: the gravity center and the hand feeling of the telescopic chain saw are optimized by reasonably setting the length ratio between the main machine and the handle in the chain saw shell.

Drawings

FIG. 1 is a perspective view of a chain saw as one embodiment of the present application in a contracted state;

FIG. 2 is an exploded view of the chain saw of FIG. 1;

FIG. 3 is a perspective view of the chain saw of FIG. 1 in an extended state;

FIG. 4 is a plan view of the chain saw of FIG. 1;

FIG. 5 is a plan view of a portion of the internal structure of the chain saw of FIG. 1;

FIG. 6 is a plan view of a portion of the internal structure of the handle of the chain saw of FIG. 1;

FIG. 7 is a plan view of the main body length and handle length of the chain saw of FIG. 1;

FIG. 8 is a plan view of a first length of the chain saw of FIG. 1;

FIG. 9 is a plan view of a second length of the chain saw of FIG. 3;

FIG. 10 is a plan view of the inner and outer diameters of the handle and the inner and outer diameters of the first link of the chainsaw of FIG. 1;

FIG. 11 is a plan view of the inner and outer diameters of the first link and the second link of the chainsaw of FIG. 1;

FIG. 12 is a perspective view of the extension pole assembly of the chain saw of FIG. 1 in a first state;

FIG. 13 is a broken cross-sectional view of the telescoping rod assembly of FIG. 12 in a first state;

FIG. 14 is an exploded view of the telescoping pole assembly of FIG. 12 in a first condition

FIG. 15 is a perspective view of the extension pole assembly of the chain saw of FIG. 3 in a second condition;

FIG. 16 is a cross-sectional view of the telescoping rod assembly of FIG. 15 in a second state;

FIG. 17 is an exploded view of the telescoping rod assembly of FIG. 15 in a second condition;

FIG. 18 is a perspective view of the first locking assembly of the telescoping pole assembly of FIG. 1;

fig. 19 is an exploded view of the second locking assembly of the telescoping pole assembly of fig. 3.

Detailed Description

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 following drawings.

In this application, the terms "comprises," "comprising," "has," "having," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the present application, the term "and/or" is an association relationship describing an association object, meaning that three relationships may exist. For example, a and/or B may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" in this application generally indicates that the front-rear association object is an "and/or" relationship.

The terms "connected," "coupled," and "mounted" are used herein to describe either a direct connection, a coupling, or an installation, or an indirect connection, a coupling, or an installation. By way of example, two parts or components are connected together without intermediate members, and by indirect connection is meant that the two parts or components are respectively connected to at least one intermediate member, through which the two parts or components are connected. Further, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings, and may include electrical connections or couplings.

In this application, one of ordinary skill in the art will understand that relative terms (e.g., "about," "approximately," "substantially," etc.) used in connection with quantities or conditions are intended to include the values and have the meanings indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a particular value, the tolerance associated with a particular value resulting from manufacture, assembly, use, 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 the addition or subtraction of a percentage (e.g., 1%,5%,10% or more) of the indicated value. Numerical values, not employing relative terms, should also be construed as having specific values of tolerance. Further, "substantially" when referring to relative angular positional relationships (e.g., substantially parallel, substantially perpendicular) may refer to adding or subtracting a degree (e.g., 1 degree, 5 degrees, 10 degrees, or more) from the indicated angle.

In this application, one of ordinary skill in the art will understand that a function performed by a component may be performed by one component, multiple components, a part, or multiple parts. Also, the functions performed by the elements may be performed by one element, by an assembly, or by a combination of elements.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", and the like are described in terms of orientation and positional relationship shown in the drawings, and should not be construed as limiting the embodiments of the present application. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements. It should also be understood that the terms upper, lower, left, right, front, back, etc. are not only intended to represent positive orientations, but also to be construed as lateral orientations. For example, the lower side may include a right lower side, a left lower side, a right lower side, a front lower side, a rear lower side, and the like.

In order to meet the operation requirement of part of the working scene, some handheld electric tools are required to have a telescopic function to adjust the length of the handheld electric tools, and the telescopic function brings optimization and improvement to the aspects of the whole hand feeling, the use safety, the operation effect and the like of the electric tools. The chain saw is a common electric tool, and the chain saw with the telescopic function can meet the requirements of different cutting heights while keeping the advantage of small and exquisite portability.

The technical solutions proposed in the present application are specifically described below with reference to the accompanying drawings and the specific embodiments.

Fig. 1 shows a chain saw 100 as an example in the present application. As shown in fig. 1 to 3, the chain saw 100 includes a main body housing 10, a guide plate 20, a chain 30, and a motor 40, and fig. 1 also defines directions of a front side, a rear side, an upper side, a lower side, a left side, and a right side in the present application.

The main body case 10 has a front portion 111, a rear portion 112, and an intermediate portion 113 between the front portion 111 and the rear portion 112, and an accommodating space is formed in the main body case 10. The guide plate 20 extends forward from the front 111 of the main body housing 10 with a portion of its rear end located within the front 111 of the main body housing 10 and the remainder extending largely beyond the front 111 of the main body housing 10. The guide plate 20 supports a chain 30 provided around the outer periphery thereof, and the chain 30 is a functional member of the chain saw 100. In some embodiments, the chain saw 100 further includes a shield 121 removably coupled to the front 111 of the main housing 10, the shield 121 housing a portion of the guide plate 20 and chain 30, protecting the chain 30 itself and user safety.

As shown in fig. 2, in this embodiment, the main housing 10 may include a left main housing 114 and a right main housing 115, the left and right main housings may be connected in a butt joint, and the motor 40 may be accommodated in the middle portion 113 of the right main housing. The motor shaft of the motor 40, when rotated, may directly or indirectly drive the chain 30 through a drive assembly about the guide plate 20 for a cutting operation, and the motor axis may be substantially perpendicular to the first plane 202 in which 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.

Defining the main machine length L3 as the distance between the front 111 most front side of the main machine housing 10 and the rear 112 most rear side of the main machine housing 10, in some embodiments, in order to achieve both cutting performance and structural arrangement of the telescopic chainsaw, the ratio of the output power of the chainsaw 100 to the main machine length L3 may be 1.5W/mm or more and 3.5W/mm or less, specifically, the output power of the chainsaw may be the output power of the motor 40, or the rated power of the motor 40, or the output shaft power of the motion of the driving chain 30. In other embodiments, the ratio of the output power of the chainsaw 100 to the main machine length L3 may be greater than or equal to 2W/mm and less than or equal to 3W/mm.

As shown in fig. 1 to 3, the chain saw 100 further includes a handle 50, an adjustment device 60, and a power supply device 70.

The handle 50 is for a user to hold, and has an upper portion 511 and a lower portion 512, and an accommodating space is formed in the handle 50. The front end of the handle upper portion 511 constitutes a handle front end 513, the rear end of the handle upper portion 511 is connected to the handle lower portion 512, and the rear ends of the handle upper and lower portions 511, 512 together constitute a handle rear end 514. The handle 50 is located on the rear side of the main housing 10 with the front handle end 513 near the rear 112 of the main housing 10 and the rear handle end 514 remote from the main housing 10. A handle holding portion 516 actually held by a user is arranged between the front end 513 and the rear end 514 of the handle, the cross section of the handle holding portion 516 can be round or rectangular, and the handle center line 501 penetrates through the handle holding portion 516. As shown in fig. 4 and 5, the handle centerline 501 of the handle 50 is substantially parallel to the guide plate centerline 201 of the guide plate 20 to provide a more stable center of gravity of the telescopic chain saw. In this embodiment, the handle center line 501 may also coincide with the guide plate center line 201 to further stabilize the center of gravity. In other cases, the handle centerline 501 may also be parallel above or below the guide plate centerline 201.

As shown in fig. 7, the length L3 of the main body is defined as a distance from the front 111 of the main body housing 10 to the rear 112 of the main body housing 10, and the length L4 of the handle is defined as a distance from the front 513 of the handle to the rear 514 of the handle, and in some embodiments, a ratio of the length L3 of the main body to the length L4 of the handle may be greater than or equal to 0.3 and less than or equal to 0.8 in order to optimize the center of gravity of the telescopic chain saw and improve the feel of the telescopic chain saw. In other embodiments, the ratio of the host length L3 to the handle length L4 may be greater than or equal to 0.4 and less than or equal to 0.7.

The adjusting device 60 is configured to move the main body housing 10 and the handle 50 in a telescopic direction thereof by changing a length thereof, and the adjusting device 60 has a contracted state and an extended state, and may further include one or more half-extended states between the contracted state and the extended state, the length of the chainsaw 100 in the contracted state being shorter, the length of the chainsaw 100 in the extended state or the half-extended state being longer, and the length of the chainsaw 100 in the extended state being longer than the length of the chainsaw 100 in the half-extended state. The adjustment device 60 may be implemented by a plurality of link-cooperating locking assemblies that are sleeved in sequence, the specific structure of which will be described in detail later. As shown in fig. 1, 4 and 5, when the adjusting device 60 is in the retracted state, the front end 513 of the handle abuts against the rear 112 of the main housing 10, and the adjusting device 60 may be wholly contained in the handle 50 or partially contained in the main housing 10. As shown in fig. 3 and 9, when the adjusting device 60 is in the extended state, the front end 513 of the handle is separated from the rear 112 of the main body 10, and the adjusting device 60 may be located between the handle 50 and the main body 10, a part of the rear end may be located in the handle 50, a part of the front end may be located in the rear 112 of the main body 10, and the rest of the front end may extend out of the handle 50 and the main body 10.

The handle 50 is provided with a first switch 52 for operation by a user, the first switch 52 may be located near the front end face 513 of the handle, and the first switch 52 may be used to control the start or stop of the motor 40, or may be used to control the rotation speed of the motor 40. In this embodiment, the first switch may be a trigger switch 52, and the trigger switch 52 may be disposed near the front end 513 of the handle and pivot with respect to the handle 50, and the torque from the first switch 52 to the forefront of the chain 30 is 2.6n·m or less when the power supply device 70 is mounted to the chain saw 100. In other cases, the first switch 52 may be a toggle switch 52 that toggles in a front-to-back direction or a left-to-right direction.

The power supply 70 is at least capable of supplying power to the motor 40 such that the motor 40 drives the chain 30 around the guide plate 20. In the present embodiment, the power supply device 70 is a battery pack 70, but the power supply device 70 is not limited to the battery pack, and the chain saw 100 may also adopt other power supply modes, and in other cases, ac power may also be used to implement power supply in combination with related circuits such as voltage transformation, rectification, voltage stabilization, or a power adapter. As shown in fig. 4 and 5, the power supply 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 with or connected to the coupling portion 515, and the battery pack 70 is detachably connected to the coupling portion 515 along the direction of the second straight line 701, and can be inserted into or pulled out of the coupling portion 515 along the direction of the second straight line 701. In this embodiment, the second line 701 is substantially parallel to the handle centerline 501, for example, the plane of the battery pack 70 may be perpendicular to the first plane 202 of the guide plate 20. In other cases, the second line 701 may also be at an angle to the handle centerline 501.

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

The chain saw 100 also includes a circuit board assembly 80 that can be used to control the power supply condition of the power supply device 70, the operating condition of the motor 40, and the like. As shown in fig. 4 and 5, the circuit board assembly 80 is disposed within the handle lower portion 512 below the handle centerline 501 and supported by the handle 50, and the circuit board centerline 801 of the circuit board assembly 80 may be parallel to the handle centerline 501. In some embodiments, the second plane 802 in which the circuit board assembly 80 resides may be generally below the handle centerline 501 and may be perpendicular to the first plane 202 in which the guide plate 20 resides.

The chain saw 100 further includes a stationary wire 81 and a movable wire 82. The fixing wire 81 may electrically connect the circuit board assembly 80 and the first switch 52, and the circuit position thereof may be fixed, which may be a conventional circuit. As shown in fig. 6, the securing wire 81 may extend from the circuit board assembly 80 within the handle lower portion 512, through the handle 50, against a wire slot 519 provided in the inner wall of the lower side of the handle upper portion 511, to the first switch 52 near the handle front end 513. The movable wire 82 may electrically connect the power supply device 70 and the motor 40, and since there is a length-variable adjusting device 60 between the power supply device 70 and the motor 40, the movable wire 82 may be a spring wire 82, which can extend and retract along with the adjusting device 60 without affecting the power supply stability, as shown in fig. 6, and is disposed between the handle rear end 614 and the adjusting device 60, in some embodiments, the spring wire 82 may be in a pre-tensioned state when the adjusting device 60 is in a contracted state, so as to prolong the service life of the spring wire 82.

The handle lower portion 512 is further provided with a heat dissipation opening 83 near the housing of the circuit board assembly 80, the heat dissipation opening 83 can perform physical heat dissipation on the circuit board assembly 80, and in other cases, the chain saw 100 further comprises a fan, the fan can be installed on the motor shaft and rotate along with the motor shaft, the adjusting device 60 is designed to be in a high airtight state, the heat dissipation opening 83 can be an air flow inlet, and heat dissipation air generated by the fan can flow through the circuit board assembly 80, the adjusting device 60 and the motor 40, so that heat dissipation performance of the telescopic chain saw is improved.

The handle is further provided with a second switch 53 for user operation, the second switch 53 can lock the motor 40 to be kept in a starting state or a stopping state, in some embodiments, the second switch 53 can be arranged on the upper side of the first switch 52 along the up-down direction, and the second switch 53 can be located between the first switch 52 and the telescopic rod assembly 61 in the handle 50, but the second switch 53 located between the first switch 52 and the telescopic rod assembly 61 can cause the outer diameter D of the handle 50 to be increased, so that the hand feeling of the user holding the handle 50 is affected. As shown in fig. 6, in this embodiment, the second switch 53 may be disposed on the front side of the first switch 52 along the front-rear direction, and the second switch 53 may be disposed on the front side of the first switch 52, on the lower side of the telescopic rod assembly 61, and near the front end 513 of the handle in the handle 50, so that the outer diameter of the handle 50 is not increased, and the hand feeling of the user holding the handle 50 is improved. In other embodiments, the second switch 53 may have a bevel that is positioned to hold the thumb of the user while holding the chain saw 100 so that the user may comfortably rest the thumb on the second switch 53.

The chain saw 100 further includes a support assembly 90, as shown in fig. 3 and 4, the support assembly 90 may include a first support 91 and a second support 92, wherein the first support 91 is connected to the main housing 10 and may be a triangular support angle, and the second support 92 is connected to the handle 50 and may be a rectangular hand guard. In the case where the power supply device 70 is not provided to the chain saw 100, support is provided by the bottom end of the first support 91 and the front edge of the second support 92 when placed on a horizontal plane. In the case where the power supply device 70 is provided to the chain saw 100, the bottom end of the first support 91 and the bottom surface of the power supply device 70 are supported when placed on a horizontal plane.

Fig. 12 to 17 show the adjustment device 60 in the chain saw 100 shown in fig. 1, 3. The adjustment device 60 comprises a telescopic rod assembly 61, the telescopic rod assembly 61 having at least a first state and a second state, which are telescopic along a direction in which the first line 101 is located. Wherein the first straight line 101 is substantially parallel to the guide plate centerline 201, i.e., the first straight line 101 is substantially parallel to the guide plate centerline 201 and the handle centerline 501, and the telescopic link assembly 61 is telescopic along the direction of the guide plate centerline 201 or the handle centerline 501. In some embodiments, the first line 101, the guide plate centerline 201, and the handle centerline 501 are coincident.

As shown in fig. 1, 4, 5 and 8, the telescopic rod assembly 61 is in the first state, the adjusting device 60 is in the contracted state, and the length of the chain saw 100 is defined as a first length L1 of the chain saw 100, and the first length L1 is a minimum length value of the extension and retraction of the chain saw 100. As shown in fig. 3 and 9, the telescopic rod assembly 61 is in the second state, the adjusting device 60 is in the extended state, and the length of the chain saw 100 is defined as a second length L2 of the chain saw 100, and the second length L2 is a maximum length value of the extension of the chain saw 100. The telescopic bar assembly 61 is in another intermediate state between the first state and the second state, the adjustment device 60 is in a semi-extended state, when the length of the chainsaw 100 is between the first length L1 and the second length L2.

In some embodiments, to achieve both telescoping function and good center of gravity, the ratio of the second length L2 to the first length L1 of the chainsaw 100 may be 1.4 or more and 2.8 or less. In other embodiments, the ratio of the second length L2 to the first length L1 of the chainsaw 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 chainsaw 100 is 550mm or less and the second length L2 of the chainsaw 100 is 800mm or more.

As shown in fig. 1, 4 and 5, when the telescopic rod assembly 61 is in the first state, the telescopic rod assembly 61 is accommodated in the handle 50 in a retracted manner, and the rear end 514 of the handle is provided with a housing of the upper portion 511 of the handle, the telescopic rod assembly 61, a housing of the lower portion 512 of the handle and the power supply device 70, when viewed from above, in sequence, and the power supply device 70 is at least partially overlapped with the projection of the telescopic rod assembly 61 on the projection plane perpendicular to the first plane 202 of the guide plate 20. In some embodiments, the handle upper portion 511 housing, the telescopic rod assembly 61, the circuit board assembly 80, the handle lower portion 512 housing, and the power supply device 70 are sequentially seen from top to bottom at the handle rear end 514, and the projection of the circuit board assembly 80 and the telescopic rod assembly 61 on the projection plane perpendicular to the first plane 202 of the guide plate 20 at least partially coincides.

In this embodiment, when the telescopic bar assembly 61 is in the first state, the center of gravity of the case where the power supply device 70 is mounted on the chain saw 100 is located at the handle grip 516, which is substantially similar to the position of the hand jaw when the user grips the handle in the axial direction of the handle, and the distance from the center line 501 of the handle in the radial direction of the handle is 10mm or less.

As shown in fig. 3 and 9, when the telescopic rod assembly 61 is in the second state, the telescopic rod assembly 61 extends out of the handle 50, and the handle rear end 514 is sequentially a housing of the handle upper portion 511, a housing of the handle lower portion 512, and the power supply device 70, or sequentially a housing of the handle upper portion 511, a part of the rear end of the telescopic rod assembly 61, a housing of the handle lower portion 512, and the power supply device 70, when viewed from above. In some embodiments, the handle upper portion 511 housing, the circuit board assembly 80, the handle lower portion 512 housing, and the power supply 70, or the handle upper portion 511 housing, a portion of the rear end of the telescopic link assembly 61, the circuit board assembly 80, the handle lower portion 512 housing, and the power supply 70, are sequentially seen from top to bottom at the handle rear end 514.

In this embodiment, when the telescopic bar assembly 61 is in the second state, the center of gravity of the chain saw 100 with the power supply 70 is located between the handle center of the handle 50 and the guide center of the guide 20.

As shown in fig. 12 and 15, the telescopic rod assembly 61 may be composed of a plurality of links sleeved in sequence, and the telescopic rod assembly 61 includes at least a first link 611 and a second link 612. The first link 611 is a link closer to the handle 50 in the extended state of the adjusting device 60, and is slidably connected to the handle 50. The second link 612 is a link closer to the main body casing 10 in the extended state of the adjusting device 60, and the front end thereof is fixedly connected to the rear of the main body casing 10. In some embodiments, the first and second links 611, 612 may be made of an aluminum alloy, a magnesium alloy, or a carbon fiber material to enhance the feel of the telescopic chain saw 100 without affecting the performance of the telescopic chain saw 100.

In some embodiments, the first link 611 and the second link 612 may be flat tubes or square tubes to enhance the anti-rotation capability of the telescopic rod assembly 61, and to keep the first and second links 611, 612 stable within the handle 50 from rotating.

In some embodiments, as shown in fig. 6, 14 and 17, the rear end of the first link 611 is provided with a bushing 64, the bushing 64 is clamped with the rear end 514 of the handle to keep the first link 611 stable in the handle 50, the inner wall of the handle 50 is further provided with a guiding rib 518 parallel to the central line 501 of the handle, the bushing 64 at the rear end of the first link 611 and/or the outer wall of the first link 611 can cooperate with the guiding rib 518 to enable the first link 611 to stretch and retract along a direction parallel to the central line 501 of the handle, stability of the first link 611 during stretching is ensured, and the bushing 64 can abut against the housing of the front end 613 of the handle when the telescopic link assembly 61 is in the second state to prevent the first link 611 from being separated from the handle 50. In other embodiments, the rear end of the second link 612 may also be provided with a bushing that clamps against the inner wall of the first link 611 to stabilize the second link 612 within the first link 611 and abuts the second locking assembly 63, which will be described later, to prevent the second link 612 from being disengaged from the first link 611 when the telescopic link assembly 61 is in the second state.

As shown in fig. 10 and 11, the outer diameter D1 of the first link 611 is smaller than the inner diameter D of the handle, and the outer diameter D2 of the second link 612 is smaller than the inner diameter D1 of the first link 611. The case where the telescopic link assembly 61 includes the first link 611 and the second link 612 will be mainly described hereinafter. In other cases, the telescopic link assembly 61 may also include a first link 611, a second link 612, and at least one intermediate link, wherein the inner diameter of the link closer to the handle 50 in the fore-and-aft direction is greater than the outer diameter of the link closer to the rear 112 of the main housing 10 when the adjustment device 60 is in the extended state.

As shown in fig. 10 and 11, in some embodiments, to improve the handle 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 link 611 may 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 enhance the feel of the telescopic chain saw 100, the ratio of the outer diameter D1 of the first link 611 to the outer diameter D2 of the second link 612 may 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 enhance the feel of the telescopic chain saw 100, the outer diameter D of the handle 50 is greater than or equal to 35mm and less than or equal to 40mm, and the outer diameter D1 of the first link 611 is greater than or equal to 25mm and less than or equal to 30mm.

The adjustment device 60 further comprises 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 link 611, the second link 612 and the main housing 10 when the telescopic link assembly 61 is in the first state, so that the first and second links 611, 612 are kept in a state of being accommodated in the handle 50 in a retracted manner and the front end 513 of the handle is tightly abutted against the rear portion 112 of the main housing 10 in the first state. The first locking assembly 62 also serves to lock the handle 50 with the first link 611 when the telescopic link assembly 61 is in the second state, such that the first link 611 remains extended beyond the handle front end 513 in the second state. The second locking assembly 63 is used to lock the first link 611 and the second link 612 when the telescopic link assembly 61 is in the second state, so that the second link 612 is maintained in a state of extending out of the front end 513 of the handle in the second state.

As shown in fig. 14, 17 and 18, in some embodiments, the first locking component 62 is connected to the inner wall of the handle 50, and in this embodiment, the first locking component 62 includes a first protection plate 621 fixedly connected to the inner wall of the handle 50, a first rocker 623 rotatably connected to the first protection plate 621 through a first shaft 622, and a reset torsion spring 624 penetrating the first shaft 622 and connected to the first rocker 623. The front end of the first link 611 is provided with a first locking hole 611a, the front end of the second link 612 is provided with a second locking hole 612a, when the telescopic link assembly 61 is in the first state, the first locking hole 611a and the second locking hole 612a are aligned, and one end of the first rocker 623 is inserted into the first locking hole 611a and the second locking hole 612a in a penetrating manner so as to lock the positions of the first link 611 and the second link 612. The rear end of the first link 611 is further provided with a third locking hole 611b, and when the telescopic link assembly 61 is in the second state, one end of the first rocker 623 is inserted into the third locking hole 611b to lock the position of the first link 611. In some embodiments, the first rocker 623 points toward the center of the cross-section of the handle grip 516 when inserted into the locking aperture.

As shown in fig. 14, 17 and 19, in some embodiments, the second locking assembly 63 is connected to the outer wall of the first link 611, and in this embodiment, the second locking assembly 63 includes a second protection plate 631 fixedly connected to the outer wall of the first link 611, a second rocker 633 rotatably connected to the second protection plate 631 through a second rotation shaft 632, and a resistance spring 634 interposed between the second protection plate 631 and the second rocker 633. The front end of the first link 611 is further provided with a fifth locking hole 611c, the rear end of the second link 612 is further provided with a fourth locking hole 612b, and when the telescopic rod assembly 61 is in the second state, one end of the second rocker 633 is inserted into the fourth and fifth locking holes 612b and 611c in a penetrating manner so as to lock the positions of the first and second links 611 and 612. In some embodiments, the second rocker 633 is directed toward the center of the cross-section of the handle grip 516 when inserted into the locking aperture. In some embodiments, the second protection plate 631 may be annular and form a closed space on the outer wall of the first link 611, where the second rocker 633, the resistance spring 634, and the like are accommodated, so that a dust-proof effect can be achieved, and interference of the branch scraps in the cutting operation is avoided.

In order to avoid mutual interference between the first and second locking assemblies 62 and 63, the third straight line where the first, second and third locking holes 611a, 612a and 611b are located is not coincident 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 may be provided on the left side inner wall or the right side inner wall of the first and second connecting rods 611 and 612, and the fourth and fifth locking holes 612b and 611c may be provided on the upper side inner wall or the lower side inner wall of the first and second connecting rods 611 and 612, and vice versa.

In some embodiments, the first rocker 623 and the second rocker 633 may be square rockers, and the locking holes are corresponding square locking holes, so that locking between the rockers and the locking holes is more stable.

The handle 50 is provided with an adjusting switch 54 for operation by a user, the adjusting switch 54 may be provided at a front end 513 of the handle and located near the grip portion 516 of the handle for enabling or disabling the first locking member 62, and in particular, the adjusting switch 54 may include a button 54, and when the button 54 is triggered, pressure may be applied to the non-insertion end of the first rocker 623 to pivot the first rocker 623, and the insertion end thereof is disengaged from the locking hole.

As shown in fig. 6, a stopper 517 is provided on the inner wall of the handle 50, and the stopper 517 may be provided near the front end surface 513 of the handle, for enabling or disabling the second locking assembly 63, specifically, the stopper 517 may abut against the second rocker 633 and compress the resistance spring 634 when triggered, so that the second rocker 633 pivots, and its insertion end is disengaged from the locking hole.

The extension process of the chainsaw 100 in which the telescopic bar assembly 61 is changed from the first state to the second state will be described.

Assuming that the current telescopic link 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, and 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 about the first rotation shaft 622, and the insertion end thereof is disengaged from the first and second locking holes 611a and 612a. If the stopper 517 is set in a triggered state when the telescopic rod assembly 61 is in the first state, that is, the position of the stopper 517 in the first state is in a position of abutting against the second rocker 633 and the compression resistance spring 634, the insertion end of the second rocker 633 is not inserted into the fifth locking hole 611c, after the insertion end of the first rocker 623 is separated 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 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 force between the handle and the first connecting rod 611 and between the first connecting rod 611 and the second connecting rod 612.

In the process that the first and second links sequentially extend out of the handle, the second rocker 633 abuts against the limiting block 517 or the outer wall of the second link 612 and compresses the resistance spring 634, the second rocker 633 keeps a state of not being inserted into the fifth locking hole 611c or being inserted into the fifth locking hole 611c but not being inserted into the fourth locking hole 612b until the first and second links 611 and 612 completely extend out of the handle 50, the resistance spring 634 drives the through-insertion into the fourth and fifth locking holes 612b and 611c after the second rocker 633 moves to the fourth locking hole 612b, the first rocker 623 moves to the third locking hole 611b and is driven by the reset torsion spring 624 to be inserted into the third locking hole 611b, and the telescopic rod assembly 61 achieves the second state.

If the stopper 517 is set in the non-triggered state when the telescopic rod assembly 61 is in the first state, that is, the position of the stopper 517 is not in the position of abutting against the second rocker 633 and the compression resistance spring 634 in the first state, the insertion end of the second rocker 633 is inserted into the fifth locking hole 611c, and after the insertion end of the first rocker 623 is separated from the first and second locking holes 611a and 612a, the user can stretch the first link 611 or the second link 612.

When the first link 611 is pulled first, the force applied by the user triggers the stopper 517, the insertion end of the second rocker 633 is separated from the fifth locking hole 611c first, the first link 611 is extended out of the handle, then the second rocker 633 abuts against the outer wall of the second link 612 and compresses the resistance spring 634, the second rocker 633 keeps the state of being inserted into the fifth locking hole 611c but not into the fourth locking hole 612b until the first and second links 611, 612 are completely extended out of the handle 50, the resistance spring 634 drives the insertion through the fourth and fifth locking holes 612b, 611c after the second rocker 633 moves to the fourth locking hole 612b, the first rocker 623 is driven by the reset torsion spring 624 to be inserted into the third locking hole 611b after the first rocker 623 moves to the third locking hole 611b, and the telescopic rod assembly 61 achieves the second state.

When the second link 612 is pulled first, the stopper 517 limits the extension of the first link 611, the second rocker 633 remains inserted into the fifth locking hole 611c and is not inserted into the fourth locking hole 612b until the second rocker 633 moves to the fourth locking hole 612b, the second rocker 633 penetrates through and is inserted into the fourth and fifth locking holes 612b and 611c, the first rocker 623 is inserted into the first locking hole 611a, the telescopic link 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 retracted and accommodated in the handle 50 before reaching the second state, the third state is a semi-extended state of the adjusting device 60, and then the user can extend the first link 611 again, and a specific process for achieving the second state will be described later with reference to the foregoing.

The following describes the retraction process of the chainsaw 100 in which the telescopic bar assembly 61 is changed from the second state to the first state.

Assuming that the current telescopic link assembly 61 is in the second state, the insertion end of the first rocker 623 is inserted into the third locking hole 611b, the insertion end of the second rocker 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 623, the insertion end of the first rocker 623 is separated from the third locking hole 611b after rotating around the shaft, the first link 611 is retracted into the handle 50 until the first rocker 623 moves to the first locking hole 611a, then the stopper 517 on the inner wall of the handle 50 is brought into the triggered state, the stopper 517 abuts against the second rocker 633 and compresses the resistance spring 634 to separate the insertion end of the second rocker 633 from the fourth and fifth locking holes 612b and 611c, the second link 612 is retracted into the handle 50 until the first rocker 623 moves to the second locking hole 612a, the first rocker 623 is inserted into the first and second locking holes 611a and 612a, and the telescopic link assembly 61 is brought into the first state.

In some embodiments, the adjusting device 60 may further include other types and a greater number of locking assemblies, the telescopic rod assembly 61 may further include intermediate links, and each link may further include a greater number of locking holes, so that the locking assemblies cooperate with the telescopic rod assembly to achieve stepless adjustment of the adjusting device 60, and the length of the adjusting device 60 may be locked at any length value within the length range during the adjustment process.

The foregoing has outlined and described the basic principles, main features and advantages of the present application. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the present application in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the present application.

Claims (10)

1. A chain saw, comprising:

a main body case having a front portion, a rear portion, and an intermediate portion between the front portion and the rear portion;

a motor disposed within the intermediate portion of the main housing;

a guide plate extending from the front of the main body case;

a chain disposed around the guide plate;

the handle is used for being held by a user and is provided with a front end face and a rear end face;

the host shell and the handle relatively move along the extending direction of the adjusting device through the adjusting device;

the handle is characterized in that the ratio of the length of the main machine shell to the length of the handle is more than or equal to 0.3 and less than or equal to 0.8, the length of the main machine is the distance from the forefront side to the rearmost side of the front part of the main machine shell, and the length of the handle is the distance from the front end face to the rear end face of the handle.

2. The chain saw as recited in claim 1, wherein a ratio of said main machine length to said handle length is greater than or equal to 0.4 and less than or equal to 0.7.

3. The chainsaw of claim 1, wherein a ratio of an output power of the chainsaw to the length of the main machine is greater than or equal to 1.5W/mm and less than or equal to 3.5W/mm.

4. The chain saw as in claim 1, wherein the adjustment device comprises a telescoping pole assembly that telescopes in a direction along a first line with at least a first or second condition.

5. The chain saw as set forth in claim 4, wherein the ratio of the second length of the chain saw in the second state to the first length of the chain saw in the first state is 1.4 or more and 2.8 or less.

6. A chain saw as in claim 4, wherein the second length of the chain saw in the second condition is 800mm or greater.

7. The chain saw as set forth in claim 4, wherein said telescopic bar assembly comprises at least a first link and a second link, said handle having an inner diameter greater than an outer diameter of said first link, said first link having an inner diameter greater than an outer diameter of said second link.

8. The chain saw as recited in claim 7, wherein a ratio of an outer diameter of said handle to an outer diameter of said first link is less than or equal to 1.5.

9. The chain saw as recited in claim 7, wherein an outer diameter of said handle is 35mm or more and 40mm or less, and an outer diameter of said first link is 25mm or more and 30mm or less.

10. The chain saw as recited in claim 7, wherein a ratio of an outer diameter of said first link to an outer diameter of said second link is less than or equal to 1.5.