Long pole tool and lopper saw

Abstract

The utility model relates to a long rod tool which comprises a power head, a working head, an extension pipe, a transmission shaft and a connecting shaft piece, and the power head comprises a machine shell and a motor arranged in the machine shell; the extension pipe is connected between the power head and the working head; the transmission shaft is rotationally arranged in the extension pipe and is configured to transmit the driving force of the motor to the working head; the connecting shaft piece is configured to be connected with the power output end of the motor and the transmission shaft and transmit torque, the connecting shaft piece is movably arranged in the axial direction of the transmission shaft relative to the extension pipe, and the connecting shaft piece comprises a connecting shaft piece limiting part; and a connecting shaft piece stop part is arranged in the extension pipe, and the connecting shaft piece stop part is in stop fit with the connecting shaft piece limiting part so as to limit the movement of the connecting shaft piece relative to the extension pipe in the axial direction of the transmission shaft towards the direction far away from the power head. The connecting shaft piece stopping part is arranged in the extension pipe and matched with the connecting shaft piece limiting part of the connecting shaft piece in a stopping mode, and the situation that the transmission shaft is excessively stressed and moves to affect power transmission can be avoided.

Description

Technical Field

[0001] This application relates to the field of garden tool technology, and in particular to a long-handled tool and a high-branch saw. Background Technology

[0002] Long-handled tools, such as high-pole saws, high-pole shears, and lawn mowers, typically include a power head, a working head, an extension tube between the power head and the working head, and a drive shaft rotatably mounted in the extension tube. For ease of transport, the power head, working head, extension tube, and drive shaft are usually relatively detachable. The extension tube and drive shaft can also be segmented, and the segments can be assembled and disassembled.

[0003] During assembly, since the drive shaft is connected to the motor power output end through a coupling and can transmit torque, and there is a plug-in mating structure between them that requires alignment during installation, it may be plugged in without proper alignment during assembly. This can cause the drive shaft to be subjected to an axial thrust away from the direction of the power head, resulting in excessive axial displacement and affecting power transmission. Utility Model Content

[0004] The purpose of this application is to provide a long-handled tool and a high-branch saw that can prevent the drive shaft from being excessively displaced during tool assembly, thus affecting power transmission.

[0005] The technical solution adopted in this application is as follows:

[0006] This application provides a long-handled tool, including:

[0007] A power head includes a housing and a motor disposed within the housing for providing driving force;

[0008] The work head is configured to perform work tasks;

[0009] An extension tube is connected between the power head and the working head;

[0010] And a drive shaft, rotatably disposed in the extension tube, configured to transmit the driving force of the motor to the working head;

[0011] The long-hand tool also includes:

[0012] A coupling, configured to connect the power output end of the motor and the drive shaft and transmit torque, the coupling being at least partially disposed within the extension tube and axially movable relative to the extension tube on the drive shaft, the coupling including a coupling limiting portion; and

[0013] A coupling stop portion is at least partially disposed inside the extension tube. The coupling stop portion cooperates with the coupling limiting portion to limit the movement of the coupling relative to the extension tube in the axial direction of the transmission shaft away from the power head.

[0014] The long-handled tool of this application, by setting a coupling stop part inside the extension tube and making the coupling stop part cooperate with the coupling limit part of the coupling, can avoid excessive axial displacement of the transmission shaft due to improper alignment during tool assembly, thus affecting power transmission.

[0015] In one embodiment, the coupling is movable relative to the drive shaft in the axial direction of the drive shaft;

[0016] The extension tube is also provided with a drive shaft stop, and the outer periphery of the drive shaft is provided with a drive shaft limiting member. The drive shaft stop and the drive shaft limiting member stop and cooperate to limit the movement of the drive shaft relative to the extension tube in the axial direction away from the power head.

[0017] The drive shaft includes an installation position for mounting the drive shaft limiting member. The installation position is configured such that when the drive shaft limiting member is installed at the installation position and cooperates with the drive shaft stop to stop, the motor can transmit torque to the drive shaft through the coupling.

[0018] The stop portion of the coupling component stops and limits the limiting portion of the coupling component to protect the transmission shaft limiting component from detaching from the installation position.

[0019] The long-handled tool of this application, by setting a coupling stop part in the extension tube and making the coupling stop part cooperate with the coupling limit part of the coupling, can prevent the transmission shaft limit part from being dislodged from the installation position due to excessive pushing of the transmission shaft by the coupling part during the tool assembly process. This ensures the axial limiting effect of the transmission shaft limit part on the transmission shaft, so that the transmission shaft will not move excessively axially during the extension, adjustment or disassembly of the long-handled tool, thus affecting the power transmission.

[0020] In one embodiment, the coupling includes a rear contact end face for abutting against the drive shaft in the axial direction of the drive shaft, and the drive shaft includes a front contact end face for abutting against the rear contact end face;

[0021] When the coupling stop portion stops the coupling limiting portion, the distance between the rear edge of the rear contact end face of the coupling and the front edge of the drive shaft stop portion is not less than the distance between the front edge of the front contact end face of the drive shaft and the rear edge of the drive shaft limiting portion.

[0022] In one embodiment, the coupling includes a rear contact end face for abutting against the drive shaft in the axial direction of the drive shaft, and the drive shaft includes a front contact end face for abutting against the rear contact end face;

[0023] When the coupling stop portion stops the coupling limiting portion, there is a gap between the rear edge of the rear contact end face of the coupling and the front edge of the front contact end face of the drive shaft and / or between the rear edge of the drive shaft limiting portion and the front edge of the drive shaft stop portion.

[0024] In one embodiment, the stop of the drive shaft stop on the drive shaft limiting member does not precede the stop of the coupling member stop on the coupling member limiting member.

[0025] The transmission shaft stop portion is configured to stop the transmission shaft limiting member in such a way that the transmission shaft stop portion abuts against the transmission shaft limiting member and the movement of the transmission shaft limiting member relative to the extension tube in the axial direction of the transmission shaft away from the power head is restricted.

[0026] The stop portion of the coupling member is configured to abut against the limiting portion of the coupling member in such a way that the stop portion of the coupling member abuts against the limiting portion of the coupling member, and the movement of the limiting portion of the coupling member relative to the extension tube in the axial direction of the transmission shaft away from the power head is restricted.

[0027] In one embodiment, the coupling stop and the coupling limit are configured such that, when the coupling stop stops the coupling limit, the pressure exerted by the drive shaft stop on the drive shaft limit in the axial direction of the drive shaft toward the power head is not greater than the frictional force experienced by the drive shaft limit in the opposite direction.

[0028] In one embodiment, at least one of the following has a gap: between the rear edge of the rear contact end face of the coupling member and the front edge of the front contact end face of the drive shaft, and between the rear edge of the drive shaft limiting member and the front edge of the drive shaft stop.

[0029] In one embodiment, when the coupling stop portion stops the coupling limiting portion, the gap between the rear end face of the coupling away from the power head and the transmission shaft stop portion in the axial direction of the transmission shaft is not less than the distance between the front edge of the transmission shaft limiting portion near the power head and the rear edge away from the power head.

[0030] In one embodiment, the coupling stop is disposed on a support member for supporting the drive shaft;

[0031] Alternatively, the stop portion of the coupling is configured to be connected to the extension tube and protrude from the inner wall of the extension tube;

[0032] Alternatively, the end of the extension tube away from the power head is provided with an end stop, and the coupling stop is configured to slide along the axial direction of the transmission shaft inside the extension tube and is located between the coupling and the end stop.

[0033] In one embodiment, a limiting groove is provided circumferentially on the outer wall of the drive shaft, and the drive shaft limiting member is configured as a limiting ring sleeved on the outer circumference of the drive shaft and locked in the limiting groove, the limiting ring protruding from the outer wall of the drive shaft;

[0034] The support member includes a bearing sleeve, which is disposed inside the extension tube and rotatably disposed relative to the extension tube. The bearing sleeve is sleeved on the outer circumference of the drive shaft and is slidably inserted into and synchronously rotated with the drive shaft to allow relative axial movement between the drive shaft and the bearing sleeve and to restrict relative rotation between the drive shaft and the bearing sleeve in the circumferential direction.

[0035] Both the coupling stop and the transmission shaft stop are provided on the bearing sleeve and are offset radially from each other on the bearing sleeve.

[0036] In one embodiment, the coupling stop and the drive shaft stop are offset from each other in the axial direction of the drive shaft, and the coupling stop is closer to the power head than the drive shaft stop.

[0037] In one embodiment, the power output end of the motor is slidably inserted into the coupling and synchronously rotated through a guide structure to allow relative axial movement between the power output end of the motor and the coupling, and to restrict relative circumferential rotation between the power output end of the motor and the coupling to transmit torque.

[0038] In one embodiment, the coupling is slidably inserted into the drive shaft and synchronously rotated through a guide structure to allow relative axial movement between the coupling and the drive shaft, and to limit relative circumferential rotation between the coupling and the drive shaft to transmit torque.

[0039] In one embodiment, the coupling includes a coupling portion for engaging with the power output end of the motor and a coupling tube for engaging with the transmission shaft, wherein the coupling portion and the coupling tube are fixedly connected relative to each other.

[0040] The coupling part has a connecting shaft at one end near the power head, and the power output end of the motor has a connecting shaft hole at one end away from the power head that mates with the connecting shaft. The coupling part is connected to the power output end of the motor through the mating of the connecting shaft and the connecting shaft hole.

[0041] The end of the coupling tube near the power head is fixedly connected to the coupling part, and the end away from the power head is sleeved on the outer periphery of the transmission shaft. The limiting part of the coupling component is configured as the end face of the coupling tube away from the power head.

[0042] In one embodiment, the extension tube includes at least a first extension section near the power head, a second extension section telescopically sleeved with the first extension section, and a locking device for positioning and locking the first extension section and the second extension section relative to each other.

[0043] The drive shaft includes at least a first drive shaft near the power head and a second drive shaft that is telescopically connected to the end of the first drive shaft away from the power head.

[0044] The first drive shaft is rotatably disposed in the first extension section. The connecting shaft, the connecting shaft stop, and the drive shaft stop are all disposed in the first extension section. The drive shaft limiting member is disposed on the first drive shaft and located in the first extension section.

[0045] In one embodiment, the extension tube includes a telescopic section and an installation section disposed between the power head and the telescopic section. The telescopic section includes at least a first section near the power head, a second section slidably sleeved with the first section, and a locking device for locking the first section and the second section relative to each other.

[0046] The drive shaft includes at least a first drive shaft near the power head and a second drive shaft that is slidably sleeved with the end of the first drive shaft away from the power head.

[0047] The first drive shaft is rotatably disposed in the installation section, the connecting shaft, the connecting shaft stop, and the drive shaft stop are all disposed in the installation section, and the drive shaft limiting member is disposed on the first drive shaft and located in the installation section;

[0048] The length of the limiting wall in the axial direction of the transmission shaft is greater than the sum of the gap between the power output end of the motor and the coupling in the axial direction of the transmission shaft and the gap between the coupling and the transmission shaft in the axial direction of the transmission shaft.

[0049] In one embodiment, the coupling stop portion includes a stop surface for cooperating with the stop of the coupling limiting portion and a limiting wall disposed at one end of the stop surface near the power head. The limiting wall is sleeved on the outer periphery of the coupling to limit the coupling in the radial direction. The projection of the limiting wall and the coupling in the axial direction of the transmission shaft at least partially overlaps.

[0050] In one embodiment, the length of the limiting wall in the axial direction of the drive shaft is greater than the sum of the gap between the power output end of the motor and the coupling in the axial direction of the drive shaft and the gap between the coupling and the drive shaft in the axial direction of the drive shaft.

[0051] In one embodiment, the coupling and the drive shaft are made of different materials.

[0052] This application also provides a high-pole saw, comprising:

[0053] A power head includes a housing and a motor disposed within the housing for providing driving force;

[0054] The working head is configured to perform cutting tasks;

[0055] An extension tube is connected between the power head and the working head;

[0056] And a drive shaft, rotatably disposed in the extension tube, configured to transmit the driving force of the motor to the working head;

[0057] The high-branch saw also includes:

[0058] A coupling, configured to connect the power output end of the motor and the drive shaft and transmit torque, the coupling being at least partially disposed within the extension tube and axially movable relative to the extension tube on the drive shaft, the coupling including a coupling limiting portion; and

[0059] A coupling stop portion is at least partially disposed inside the extension tube. The coupling stop portion cooperates with the coupling limiting portion to limit the movement of the coupling relative to the extension tube in the axial direction of the transmission shaft away from the power head.

[0060] This application provides a long-handled tool, including:

[0061] A power head includes a housing and a motor disposed within the housing for providing driving force;

[0062] The work head is used to perform work tasks;

[0063] An extension tube is connected between the power head and the working head;

[0064] And a drive shaft, rotatably disposed in the extension tube, for transmitting the driving force of the motor to the working head;

[0065] The long rod tool also includes a coupling, which is used to connect the power output end of the motor and the drive shaft and transmit torque. The coupling is movably positioned relative to the extension tube in the axial direction of the drive shaft.

[0066] The extension tube is provided with a coupling stop, and the coupling includes a coupling limiting part. The coupling stop and the coupling limiting part stop each other to limit the movement of the coupling relative to the extension tube in the axial direction of the transmission shaft away from the power head.

[0067] In one embodiment, a drive shaft stop is further provided inside the extension tube, and a drive shaft limiting part is provided on the outer periphery of the drive shaft. The drive shaft stop and the drive shaft limiting part cooperate to limit the movement of the drive shaft relative to the extension tube in the axial direction away from the power head.

[0068] The stop of the coupling member on the limit of the coupling member is used to prevent the stop of the transmission shaft stop on the limit of the transmission shaft from failing.

[0069] In one embodiment, the coupling includes a rear contact end face for abutting against the drive shaft in the axial direction of the drive shaft, and the drive shaft includes a front contact end face for abutting against the rear contact end face;

[0070] When the coupling stop portion stops the coupling limiting portion, the distance between the rear edge of the rear contact end face of the coupling and the front edge of the drive shaft stop portion is not less than the distance between the front edge of the front contact end face of the drive shaft and the rear edge of the drive shaft limiting portion.

[0071] In one embodiment, the stop of the drive shaft stop on the drive shaft limiting part does not precede the stop of the coupling member stop on the coupling member limiting part.

[0072] The drive shaft stop portion is configured to stop the drive shaft limiting portion in such a way that the drive shaft stop portion abuts against the drive shaft limiting portion and the movement of the drive shaft limiting portion relative to the extension tube in the axial direction of the drive shaft away from the power head is restricted.

[0073] The stop portion of the coupling member is configured to abut against the limiting portion of the coupling member in such a way that the stop portion of the coupling member abuts against the limiting portion of the coupling member, and the movement of the limiting portion of the coupling member relative to the extension tube in the axial direction of the transmission shaft away from the power head is restricted.

[0074] In one embodiment, the coupling includes a rear contact end face for abutting against the drive shaft in the axial direction of the drive shaft, and the drive shaft includes a front contact end face for abutting against the rear contact end face;

[0075] When the coupling stop portion stops the coupling limiting portion, there is a gap between the rear edge of the rear contact end face of the coupling and the front edge of the front contact end face of the drive shaft and / or between the rear edge of the drive shaft limiting portion and the front edge of the drive shaft stop portion.

[0076] In one embodiment, the coupling stop and the coupling limit are configured such that, when the coupling stop stops the coupling limit, the pressure exerted by the drive shaft stop on the drive shaft limit in the axial direction of the drive shaft toward the power head is not greater than the frictional force experienced by the drive shaft limit in the opposite direction.

[0077] In one embodiment, the coupling stop is disposed on a support member for supporting the drive shaft;

[0078] Alternatively, the stop portion of the coupling is configured to be fixed to the inner wall of the extension tube;

[0079] Alternatively, the end of the extension tube away from the power head is provided with an end stop, and the coupling stop is configured to slide along the axial direction of the transmission shaft inside the extension tube and is located between the coupling and the end stop.

[0080] In one embodiment, a limiting groove is provided circumferentially on the outer wall of the drive shaft, and the drive shaft limiting part is configured as a limiting ring sleeved on the outer circumference of the drive shaft and locked in the limiting groove, the limiting ring protruding from the outer wall of the drive shaft;

[0081] The support member includes a bearing sleeve, which is disposed inside the extension tube and rotatably disposed relative to the extension tube. The bearing sleeve is sleeved on the outer circumference of the drive shaft and is slidably inserted into and synchronously rotated with the drive shaft to allow relative axial movement between the drive shaft and the bearing sleeve and to restrict relative rotation between the drive shaft and the bearing sleeve in the circumferential direction.

[0082] Both the coupling stop and the transmission shaft stop are provided on the bearing sleeve and are offset radially from each other on the bearing sleeve.

[0083] In one embodiment, the coupling stop and the drive shaft stop are offset from each other in the axial direction of the drive shaft, and the coupling stop is closer to the power head than the drive shaft stop.

[0084] In one embodiment, the power output end of the motor is slidably inserted into the coupling and synchronously rotated through a guide structure to allow relative axial movement between the power output end of the motor and the coupling, and to restrict relative circumferential rotation between the power output end of the motor and the coupling to transmit torque.

[0085] In one embodiment, the coupling is slidably inserted into the drive shaft and synchronously rotated through a guide structure to allow relative axial movement between the coupling and the drive shaft, and to limit relative circumferential rotation between the coupling and the drive shaft to transmit torque.

[0086] In one embodiment, the coupling includes a coupling portion for engaging with the power output end of the motor and a coupling tube for engaging with the transmission shaft, wherein the coupling portion and the coupling tube are fixedly connected relative to each other.

[0087] The coupling part has a connecting shaft at one end near the power head, and the power output end of the motor has a connecting shaft hole at one end away from the power head that mates with the connecting shaft. The coupling part is connected to the power output end of the motor through the mating of the connecting shaft and the connecting shaft hole.

[0088] The end of the coupling tube near the power head is fixedly connected to the coupling part, and the end away from the power head is sleeved on the outer periphery of the transmission shaft. The limiting part of the coupling component is configured as the end face of the coupling tube away from the power head.

[0089] In one embodiment, when the coupling stop portion stops the coupling limiting portion, in the axial direction of the transmission shaft, the gap C1 between the rear end face of the coupling member away from the power head and the transmission shaft stop portion is greater than the distance C2 between the front edge of the transmission shaft limiting portion near the power head and the rear edge away from the power head.

[0090] In one embodiment, the coupling stop portion includes a stop surface for cooperating with the stop of the coupling limiting portion and a limiting wall disposed at one end of the stop surface near the power head. The limiting wall is sleeved on the outer periphery of the coupling to limit the coupling in the radial direction. The projection of the limiting wall and the coupling in the axial direction of the transmission shaft at least partially overlaps.

[0091] In one embodiment, the extension tube includes a telescopic section and an installation section disposed between the power head and the telescopic section. The telescopic section includes at least a first section near the power head, a second section slidably sleeved with the first section, and a locking device for locking the first section and the second section relative to each other.

[0092] The drive shaft includes at least a first drive shaft near the power head and a second drive shaft that is slidably sleeved with the end of the first drive shaft away from the power head.

[0093] The first drive shaft is rotatably disposed in the installation section, the connecting shaft, the connecting shaft stop, and the drive shaft stop are all disposed in the installation section, and the drive shaft limiting part is disposed on the first drive shaft and located in the installation section;

[0094] The length of the limiting wall in the axial direction of the transmission shaft is greater than the sum of the gap between the power output end of the motor and the coupling in the axial direction of the transmission shaft and the gap between the coupling and the transmission shaft in the axial direction of the transmission shaft. Attached Figure Description

[0095] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0096] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0097] Figure 1 This is a side view of a long-handled tool in one embodiment of this application;

[0098] Figure 2 This is a top view of a long-handled tool in one embodiment of this application;

[0099] Figure 3 This is a cross-sectional view of a long-handled tool in one embodiment of this application;

[0100] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0101] Figure 5 This is a schematic diagram of the disassembly structure of the long-handled tool in a partially installed state according to one embodiment of this application;

[0102] Figure 6 This is a schematic diagram of the long-bar tool in an unreliably assembled state according to one embodiment of this application;

[0103] Figure 7 This is a cross-sectional view of a support member in one embodiment of this application;

[0104] Figure 8 This is a perspective view of the bearing sleeve from a first-view perspective in one embodiment of this application;

[0105] Figure 9 This is a perspective view of the bearing sleeve in one embodiment of this application from a second perspective.

[0106] Figure 10 This is a cross-sectional view of a long-handled tool in another embodiment of this application;

[0107] Figure 11 yes Figure 10 Enlarged view of point B in the middle;

[0108] Figure 12 This is a cross-sectional view of the long-handled tool in another embodiment of this application;

[0109] Figure 13 yes Figure 12 Enlarged view of point C in the middle;

[0110] Figure 14 This is a partial cross-sectional view of a long-handled tool in one embodiment of this application;

[0111] Figure 15 yes Figure 14 Enlarged view of point D in the middle;

[0112] Figure 16 yes Figure 14 Enlarged view at point E in the middle;

[0113] Figure 17 yes Figure 14 Enlarged view at point F;

[0114] Figure 18 This is a partial structural cross-sectional view of a long-bar tool in an unassembled state according to one embodiment of this application;

[0115] Figure 19 This is a partial structural cross-sectional view of a long-handled tool in one embodiment of this application;

[0116] Figure 20 This is a partial three-dimensional view of the long-handled tool in one embodiment of this application;

[0117] Figure 21 This is a partial structural cross-sectional view of a long rod tool in one embodiment of this application, with a gap between the drive shaft limiting member and the drive shaft stop.

[0118] Figure 22 This is a partial structural cross-sectional view of a long rod tool in one embodiment of this application, with a gap between the connecting member and the drive shaft. Detailed Implementation

[0119] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0120] Long-handled tools in related technologies, such as high-pole saws, high-pole shears, and lawnmowers, are typically used for trimming lawns, shrubs, and trees. These tools generally include a power head, a working head, an extension tube between the power head and the working head, and a drive shaft rotatably mounted in the extension tube. The power head includes a motor that provides power to the working head. The drive shaft is connected to the motor's power output end via a coupling and transmits torque to the working head. For ease of transport, the power head, working head, extension tube, and drive shaft are usually detachable. The extension tube and drive shaft are segmented, and each segment can be assembled and disassembled. Because the drive shaft is connected to the motor's power output end via the coupling and transmits torque, they have a plug-in mating structure that requires alignment during installation. During assembly, blind insertion is often used, and the connecting shaft and shaft hole may not be correctly aligned, requiring repeated trial insertions. During these trial insertions, incorrect alignment may occur, causing the drive shaft to be pushed by the coupling, resulting in excessive axial displacement due to a large axial thrust away from the power head, affecting power transmission and hindering installation.

[0121] To address the aforementioned problems, this application provides a long-handled tool that avoids excessive axial displacement of the drive shaft affecting power transmission and is easy to install. The structure of the long-handled tool of this application will be described below using a high-pole saw as an example. This example is for illustrative purposes only and does not limit the technical scope of this application.

[0122] In one embodiment, reference Figures 1 to 6 , Figures 14 to 22 A long-handled tool includes a power head 10, a working head 20, an extension tube 30, and a drive shaft 40. The power head 10 includes a housing 101 and a motor 102 disposed within the housing 101 for providing driving force; the working head 20 is configured to perform a working task; the extension tube 30 connects the power head 10 and the working head 20; the drive shaft 40 is rotatably disposed in the extension tube 30 and configured to transmit the driving force of the motor 102 to the working head 20.

[0123] The long-handle tool also includes a coupling 50 and a coupling stop 60. The coupling 50 is configured to connect the power output end of the motor 102 and the drive shaft 40 and transmit torque. The coupling 50 is at least partially disposed within the extension tube 30 and is axially movable relative to the extension tube 30 on the drive shaft 40. The coupling 50 includes a coupling limiting portion 501. The coupling stop 60 is at least partially disposed within the extension tube 30 and engages with the coupling limiting portion 501 to limit the movement of the coupling 50 relative to the extension tube 30 axially away from the power head 10 on the drive shaft 40.

[0124] The coupling 50 and the coupling stop 60 are at least partially located inside the extension tube 30. This can be understood as follows: the coupling 50 and the coupling stop 60 can be completely located inside the extension tube 30; or only a portion of them can be located inside the extension tube 30 and the other portion can be located outside the extension tube 30. As an example, the coupling 50 is partially located inside the extension tube 30 and partially located inside the power head 10. The coupling stop 60 extends from outside the extension tube 30 into the extension tube 30 and is fixed inside the extension tube 30, with a portion located inside the extension tube 30 and a portion located outside the extension tube 30.

[0125] It is understandable that by setting the coupling stop 60 and the coupling limit 501 to stop, the maximum axial displacement of the coupling 50 relative to the extension tube 30 in the direction away from the power head is limited. This can prevent the drive shaft 40 from being excessively pushed by the coupling 50 and dislodging it from the proper installation position during tool assembly, ensuring reliable torque transmission and facilitating installation.

[0126] Specifically, refer to Figures 5 to 9 In this embodiment, the motor 102 is fixedly installed inside the housing 101. A coupling 1022 for mating with the coupling 50 is fixedly connected to the power output shaft 1021 of the motor 102. The power output end of the motor is configured as the connection end of the coupling 1022 away from the motor 102, specifically, it can be connected to the shaft hole 1023. The working head 20 is configured as a high-branch saw head for pruning trees, including a working head power input end. The drive shaft 40 is rotatably mounted in the extension tube 30 via the support member 70. One end of the drive shaft 40 is connected to the power output end of the motor 102 via the coupling 50, and the other end is connected to the power input end of the working head 20 to transmit the driving force of the motor 102 to the working head 20.

[0127] In some implementations, to achieve tool weight reduction, the coupling 50 and the drive shaft 40 are configured with different materials. As an example, the coupling 50 is made of steel to ensure reliable torque transmission, while the drive shaft 40 is made of aluminum alloy to reduce tool weight. Therefore, the drive shaft 40 is not directly connected to the power output of the motor 102 but is connected to the motor's power output through the coupling 50, which better meets the tool weight reduction requirements.

[0128] Furthermore, the power output end of the motor 102 is slidably inserted into the coupling 50 and synchronously rotated through a guide structure, allowing relative axial movement between the power output end of the motor 102 and the coupling 50, while restricting relative circumferential rotation between them to transmit torque. Specifically, the coupling 50 and the power output end of the motor 102 can be a square shaft / square hole fit structure, or a splined shaft / splined sleeve fit structure; any fit structure capable of transmitting torque is within the scope of this application.

[0129] Furthermore, the coupling 50 and the drive shaft 40 are slidably inserted and connected synchronously through a guide structure, allowing relative axial movement between the coupling 50 and the drive shaft 40 while restricting relative circumferential rotation to transmit torque. Specifically, the connection between the drive shaft 40 and the coupling 50 can be a splined shaft or splined sleeve, or a square shaft or square hole; any torque-transmitting connection structure is within the scope of this application.

[0130] In this embodiment, the coupling 50 and the power output end of the motor 102 have a square shaft and square hole mating structure, and the transmission shaft 40 and the coupling 50 have a spline shaft and spline sleeve mating structure.

[0131] In related technologies, by setting a limiting component on the drive shaft and a corresponding stop component inside the extension tube, the axial movement of the drive shaft relative to the extension tube away from the power head can be limited to avoid excessive displacement of the drive shaft, which would affect power transmission. In the aforementioned long-handled tool, because the drive shaft, connecting shaft, and motor power output end need to transmit torque, they have a plug-in mating structure that requires alignment during installation. During assembly, blind insertion is usually used, and the connecting shaft and shaft hole may not be correctly aligned, requiring repeated trial insertions. During these trial insertions, insertion may occur in an incorrectly aligned state, causing the drive shaft to be pushed by the connecting shaft and subjected to a large axial thrust away from the power head, resulting in excessive axial displacement (potentially moving beyond the shaft hole depth). This causes the limiting component to be forced out of its original limiting position, losing its effective axial limiting function for the drive shaft. Consequently, when the long-handled tool is extended or disassembled, especially when the extension tube is extended, the drive shaft may be forced to move away from the power head, resulting in unreliable torque transmission.

[0132] Therefore, in some embodiments, the coupling 50 is movably positioned relative to the drive shaft 40 in the axial direction of the drive shaft 40. A drive shaft stop 80 is also provided within the extension tube 30, and a drive shaft limiting member 401 (also called a drive shaft limiting part) is provided on the outer periphery of the drive shaft 40. The drive shaft stop 80 engages with the drive shaft limiting member 401 to limit the movement of the drive shaft 40 relative to the extension tube 30 in the axial direction away from the power head 10. The drive shaft 40 includes a mounting position for installing the drive shaft limiting member 401. The mounting position is configured such that when the drive shaft limiting member 401 is installed in the mounting position and engages with the drive shaft stop 80, the motor 102 can transmit torque to the drive shaft 40 through the coupling 50. The coupling stop 80 limits the coupling limiting member 501 to prevent the drive shaft limiting member 401 from disengaging from the mounting position. As an example, the installation position is configured as a limiting groove 403 on the outer wall of the drive shaft for mounting the drive shaft limiting member 401.

[0133] It is understandable that by setting the coupling stop 60 and the coupling limit 501 to stop, the maximum axial displacement of the coupling 50 relative to the extension tube 30 in the direction away from the power head is limited. This can prevent the drive shaft 40 from being pushed too hard by the coupling 50 in the direction away from the power head 10 during tool assembly, and ensure that the drive shaft limit 401 can always be kept in the installation position to effectively limit the drive shaft. As a result, when the long rod tool is extended or disassembled, especially when the extension tube is extended, the drive shaft will not be excessively displaced in the direction away from the power head, and torque can be reliably transmitted.

[0134] In addition, compared with the prior art, on the one hand, the present application has low strength requirements for the drive shaft limiting component, which only needs to be able to effectively limit the movement during telescopic adjustment or disassembly, and does not need to be able to withstand the strong pressure during assembly. Therefore, the cost of the drive shaft limiting component is lower and the assembly process of the drive shaft limiting component is simpler. On the other hand, the present application has low precision requirements for assembly tools and assembly processes, low equipment cost, and simpler and more reliable tool assembly.

[0135] The coupling 50 includes a rear contact end face 502 for abutting against the drive shaft 40 in the axial direction of the drive shaft 40, and the drive shaft 40 includes a front contact end face 402 for abutting against the rear contact end face 502.

[0136] In one embodiment, refer to Figure 19When the coupling stop 60 stops the coupling limiting part 501, the distance L1 between the rear edge of the rear contact end face 502 of the coupling 50 and the front edge of the drive shaft stop 80 is not less than the distance L2 between the front edge of the front contact end face 402 of the drive shaft 40 and the rear edge of the drive shaft limiting part 401. This embodiment prevents the coupling 50 from continuing to apply axial pushing force to the drive shaft 40 after reaching the stop position, avoiding excessive pushing of the drive shaft 40 by the coupling 50, which would cause the drive shaft limiting part 401 to slip from its original limiting position and lose its axial limiting function on the drive shaft 40. This would make it easier for the drive shaft 40 to leave the proper installation position, affecting torque transmission.

[0137] In one embodiment, when the coupling stop 60 stops the coupling limiting part 501, there is a gap between the rear edge of the rear contact end face 502 of the coupling 50 and the front edge of the front contact end face 402 of the drive shaft 40, and / or between the rear edge of the drive shaft limiting part 401 and the front edge of the drive shaft stop 80. That is, at least one gap exists between the rear edge of the rear contact end face 502 of the coupling 50 and the front edge of the front contact end face 402 of the drive shaft 40, and between the rear edge of the drive shaft limiting part 401 and the front edge of the drive shaft stop 80. The gap between the rear edge of the rear contact end face 502 of the coupling 50 and the front edge of the front contact end face 402 of the drive shaft 40 is D1, and the gap between the rear edge of the drive shaft limiting part 401 and the front edge of the drive shaft stop 80 is D2. This embodiment allows the coupling 50 to stop applying axial pushing force to the drive shaft 40 after reaching the stop position, thus preventing the coupling 50 from excessively pushing the drive shaft 40. This would cause the drive shaft limiting member 401 to slip off from its original limiting position and lose its axial limiting function on the drive shaft 40, making it easy for the drive shaft 40 to detach from the proper installation position and affecting torque transmission.

[0138] In one embodiment, the stop of the drive shaft stop 80 on the drive shaft limiting member 401 does not precede the stop of the coupling member stop 60 on the coupling member limiting member 501. It should be noted that the stop configuration of the drive shaft stop 60 on the drive shaft limiting member 501 is such that the drive shaft stop 80 abuts against the drive shaft limiting member 501, and the movement of the drive shaft limiting member 401 relative to the extension tube 30 in the axial direction of the drive shaft 40 away from the power head 10 is restricted; the stop configuration of the coupling member stop 60 on the coupling member limiting member 501 is such that the coupling member stop 60 abuts against the coupling member limiting member 501, and the movement of the coupling member limiting member 501 relative to the extension tube 30 in the axial direction of the drive shaft 40 away from the power head 10 is restricted. This embodiment ensures that the drive shaft limiting member 401 does not reach the stop position before the coupling member limiting part 501, thus preventing the drive shaft limiting member 401 from contacting the drive shaft stop part 80 or from continuing to apply pressure after contact. This prevents the drive shaft limiting member 401 from slipping off its original limiting position under force, ensuring the axial limiting effect on the drive shaft 40 and keeping the drive shaft 40 in a suitable installation position without affecting torque transmission.

[0139] In one embodiment, the coupling stop 60 and the coupling limiting part 501 are configured such that, when the coupling stop 60 stops the coupling limiting part 501, the pressure applied by the drive shaft stop 80 to the drive shaft limiting part 401 in the axial direction of the drive shaft 40 toward the power head 10 is not greater than the frictional force experienced by the drive shaft limiting part 401 in the opposite direction. In this embodiment, by stopping the coupling 50, the drive shaft limiting part 401 is kept in a non-displaceable force state, thus preventing it from slipping from its original limiting position. This ensures the axial limiting effect on the drive shaft 40, keeping the drive shaft 40 always in a suitable installation position and not affecting torque transmission.

[0140] Furthermore, referring to Figure 4 In one embodiment, when the coupling stop 60 stops the coupling limiting part 501, the gap C1 between the rear end face of the coupling 50 away from the power head 10 and the transmission shaft stop 80 in the axial direction of the transmission shaft 40 is not less than the distance C2 between the front edge of the transmission shaft limiting part 401 near the power head 10 and the rear edge away from the power head 10. This embodiment can avoid the coupling 50 and the transmission shaft stop 80 exerting pressure on the transmission shaft limiting part 401 in the axial direction of the transmission shaft 40. Preferably, when the coupling stop 60 stops the coupling limiting part 501, the gap C1 between the rear end face of the coupling 50 away from the power head 10 and the transmission shaft stop 80 in the axial direction of the transmission shaft 40 is greater than the distance C2 between the front edge of the transmission shaft limiting part 401 near the power head 10 and the rear edge away from the power head 10.

[0141] Understandably, the positioning of the coupling 50 after it is stopped by the coupling stop 60 needs to ensure that the tool can be reliably assembled. That is, the power output end of the motor, the power transmission between the coupling 50 and the transmission shaft 40 can transmit the driving force of the motor 102 to the working head 20.

[0142] It should be noted that when there is still space for relative axial movement between the coupling 50 and the drive shaft 40, apart from the pushing force acting directly on the drive shaft 40, other frictional forces are insufficient to cause the drive shaft limiting member 401 to slip off from its original limiting position.

[0143] In one embodiment, refer to Figure 21 and Figure 22 The coupling 50 includes a rear contact end face 502 for abutting against the drive shaft 40 axially. The drive shaft 40 includes a front contact end face 402 for abutting against the rear contact end face 502. The coupling 50 includes a front abutting end face for abutting against the power output end of the motor 102. When the drive shaft stop portion 80 stops the drive shaft limiting member 401, a first gap D1 exists between the rear edge of the rear contact end face of the coupling 50 and the front edge of the front contact end face of the drive shaft 40. The power output end of the motor has a plug-in end face P1, which is configured such that when the coupling 50 is plugged into the power output end of the motor, it is the radial end face where the front edge of the coupling 50 is located. A second gap exists between the front edge of the front abutting end face of the coupling 50 and the plug-in end face P1 of the power output end of the motor. The coupling 50 has a connecting shaft at the end near the power head 10, and the power output end of the motor has a connecting shaft hole 1023 at the end away from the power head 10, which mates with the connecting shaft 5101. The coupling 50 is connected to the power output end of the motor 102 through the mating of the connecting shaft 5101 and the connecting shaft hole. The sum of the first gap D1 and the second gap is not greater than the axial depth D3 of the connecting shaft 50 extending into the connecting shaft hole of the power output end of the motor 102 when the coupling 50 and the power output end of the motor are in the correct position.

[0144] Furthermore, such as Figure 3 , Figures 14 to 16As shown, the extension tube 30 includes at least a first extension section 310 near the power head 10 and a second extension section 320 telescopically sleeved with the first extension section 310, as well as a locking device 330 for positioning and locking the first extension section 310 and the second extension section 320 relative to each other. The drive shaft 40 includes at least a first drive shaft 410 near the power head 10 and a second drive shaft 420 telescopically sleeved with the end of the first drive shaft 410 away from the power head. The first drive shaft 410 is rotatably disposed in the first extension section 310. The coupling member 50, the coupling member stop portion 60, and the drive shaft stop portion 80 are all disposed within the first extension section 310. The drive shaft limiting member 401 is disposed on the first drive shaft 410 and located within the first extension section 310.

[0145] As an example, the first extension 310 includes a mounting section 302 near the power head 10 and a first section 3011 connected to the end of the mounting section 302 away from the power head. The mounting section 302 and the first section 3011 are detachably connected by fasteners 303. The second extension 320 includes a second section 3012 that telescopically engages with the first section 3011. A locking device 330 locks the first section 3011 and the second section 3012 in relative positioning. The first drive shaft 410 is rotatably disposed in the mounting section 302. The coupling 50, the coupling stop 60, and the drive shaft stop 80 are all disposed within the mounting section 302. The drive shaft limiting member 401 is disposed on the first drive shaft 410 and located within the mounting section 302. Specifically, both the fasteners 303 and the locking device 330 are clamps.

[0146] In one embodiment, such as Figure 3 , Figures 14 to 16As shown, the extension tube 30 includes a telescopic section 301 and a mounting section 302 disposed between the power head 10 and the telescopic section 301. The telescopic section 301 includes at least a first section 3011 near the power head 10, a second section 3012 slidably sleeved with the first section 3011, and a locking device 3013 for locking the first section 3011 and the second section 3012 in relative positioning. The drive shaft 40 includes at least a first drive shaft 410 near the power head 10 and a second drive shaft 420 slidably sleeved with the end of the first drive shaft 410 away from the power head 10. The mounting section 302 is detachably connected to the first section 3011 of the telescopic section 301 by a fastener 303. That is, the extension tube 30 and drive shaft 40 of the long-handled tool in this embodiment are configured as a telescopic structure. Preferably, the telescopic section 301 includes a first section 3011, a second section 3012, and a locking device 3013. The drive shaft 40 includes a first drive shaft 410 and a second drive shaft 420. The first section 3011 of the mounting section 302 and the telescopic section 301 are detachably connected by a clamp. The first section 3011 and the second section 3012 are positioned and locked by the clamp, that is, both the fastener 303 and the locking device 3013 are clamps.

[0147] In this embodiment, the coupling member limiting part 60, the coupling member stop part 501, the transmission shaft limiting part 401, and the transmission shaft stop part 80 are all disposed within the mounting section 302. Specifically, the first transmission shaft 410 is rotatably disposed in the mounting section 302, the coupling member 50 is slidably disposed within the mounting section 302, the coupling member limiting part 501 is disposed on the coupling member 50, and the transmission shaft limiting part 401 is disposed on the first transmission shaft 410.

[0148] The mounting section 302 is located near the power head 10, and the handle 901 for gripping and the control module 902 are typically mounted on the mounting section 302. Understandably, after tool assembly, since no adjustment is required between the mounting section 302 and the power head 10, the mounting section 302 is not usually frequently removed from the power head 10. During assembly, to ensure reliable torque transmission, it is generally desirable for the first drive shaft 410 to remain in the correct mounting position within the mounting section 302 and to always be able to transmit torque. Therefore, a drive shaft limiter 401 and a drive shaft stop 80 are provided to prevent the first drive shaft 410 from being subjected to axial forces away from the power head 10 during the extension, retraction, or removal of the telescopic section 301, which could cause it to deviate from the correct mounting position and prevent power transmission failure.

[0149] Specifically, in one embodiment, a limiting groove 403 is provided circumferentially on the outer wall of the drive shaft 40, and the drive shaft limiting member 401 is configured as a limiting ring sleeved on the outer circumference of the drive shaft 40 and engaged in the limiting groove 403, with the limiting ring protruding from the outer wall of the drive shaft 40. For ease of installation, in this embodiment, the limiting ring is configured as a partially open elastic metal ring.

[0150] Specifically, in one embodiment, the coupling 50 includes a coupling portion 510 for mating with the power output end of the motor and a coupling tube 520 for mating with the transmission shaft 40. The coupling portion 510 and the coupling tube 520 are fixedly connected relative to each other. The coupling portion 510 has a connecting shaft at one end near the power head 10, and the power output end of the motor has a connecting shaft hole at one end away from the power head 10, which mates with the connecting shaft 5101. The coupling portion 510 is connected to the power output end of the motor through the mating of the connecting shaft and the connecting shaft hole. The end of the coupling tube 520 near the power head 10 is fixedly connected to the coupling portion 510, and the end away from the power head 10 is sleeved on the outer periphery of the transmission shaft 4. The coupling limiting portion 501 is configured as the end face of the coupling tube 520 away from the power head. Specifically, to transmit torque, in this embodiment, the coupling part 510 and the power output end of the motor have a square shaft and square hole fit structure, and the transmission shaft 40 and the coupling tube 520 have a spline shaft and spline sleeve fit structure. The coupling part 510 and the coupling tube 520 are either interference fit or threaded fit connection.

[0151] In one embodiment, such as Figures 5 to 9As shown, the coupling stop 60 is disposed on the support member 70 for supporting the drive shaft 40. Further, the support member 70 includes a bearing sleeve 701, which is disposed within the extension tube 30 and rotatably disposed relative to the extension tube 30. The bearing sleeve 701 is sleeved on the outer periphery of the drive shaft 40, slidably inserted into and synchronously rotated with the drive shaft 40, allowing relative axial movement between the drive shaft 40 and the bearing sleeve 701 and restricting relative circumferential rotation between the drive shaft 40 and the bearing sleeve 701. Both the coupling stop 60 and the drive shaft stop 80 are disposed on the bearing sleeve 701 and are radially offset from each other. The coupling stop 60 and the drive shaft stop 80 are axially offset from each other on the drive shaft 40, with the coupling stop 60 being closer to the power head 10 than the drive shaft stop 80. Specifically, in this embodiment, the bearing sleeve 701 and the drive shaft 40 adopt a splined shaft and splined sleeve mating structure. More specifically, the support member 70 also includes a bearing seat 702 fixedly disposed relative to the extension tube 30 and sleeved on the outer periphery of the bearing sleeve 701, and a rolling element 703 disposed between the bearing seat 702 and the bearing sleeve 701. As an example, the bearing seat 702 can be fixed within the first section 3011 of the aforementioned telescopic section 301, with the end of the mounting section 302 away from the power head 10 embedded between the bearing sleeve 701 and the bearing seat 702, which helps to reduce vibration; the bearing seat 702 can also be fixed within the mounting section 302 of the aforementioned extension tube 30. The bearing seat 702 can be installed with an interference fit or fixed by fasteners, which is not limited here.

[0152] In another embodiment, such as Figures 10 to 11 As shown, the coupling stop 60 is configured to connect to the extension tube 30 and protrude from the inner wall of the extension tube 30. As an example, the coupling stop 60 is configured to be fixed to the inner wall of the extension tube 30. Specifically, the coupling stop 60 can be an annular stop protruding from the inner wall of the extension tube 30, which can stop the end face of the coupling tube 520 away from the power head 10. Of course, the coupling stop 60 can also be other structures capable of stopping the coupling limiting part 501. It is understood that the coupling stop 60 can stop the coupling limiting part 501, but does not affect the axial movement of the drive shaft 40.

[0153] In yet another embodiment, such as Figures 12 to 13As shown, the end of the extension tube 30 away from the power head 10 is provided with an end stop. The coupling stop 60 is configured to slide axially within the extension tube 30 along the drive shaft 40 and is located between the coupling 50 and the end stop. Specifically, in this embodiment, the coupling stop 60 is an annular cylinder that is slidably sleeved on the outer periphery of the drive shaft 40 and slidably disposed within the extension tube 30. It includes a first abutting end for abutting against the coupling limiting part 501 and a second abutting end for abutting against the end stop. The end stop may be a support member 70 installed at the end of the extension tube 30 away from the power head 10 to support the drive shaft 40. Preferably, the support member 70 includes a bearing sleeve 701, which is disposed inside the extension tube 30 and rotatably disposed relative to the extension tube 30. The bearing sleeve 701 is sleeved on the outer periphery of the drive shaft 40, and is slidably inserted into and synchronously rotated with the drive shaft 40 to allow relative axial movement between the drive shaft 40 and the bearing sleeve 701 and to restrict relative circumferential rotation between the drive shaft 40 and the bearing sleeve 701. The end stop is specifically configured as the bearing sleeve 701, that is, the coupling member stop part 60 is slidably disposed between the coupling member 50 and the bearing sleeve 701, and can abut against the coupling member 50 and the bearing sleeve 701.

[0154] It should be noted that the coupling member limiting part 501 at the end of the coupling tube 520 can be configured as an annular abutment surface, or as multiple abutment surfaces spaced apart on a plane, or as multiple abutment surfaces arranged in a stepped manner on multiple planes, or other combinations thereof. Correspondingly, the coupling member stop part 60 can be configured as an annular abutment surface, or as multiple abutment surfaces spaced apart on a plane, or as multiple abutment surfaces arranged in a stepped manner on multiple planes, or other combinations thereof.

[0155] Long-handled tools are typically assembled using the following steps:

[0156] Step 1: The operator inserts the first drive shaft 410 into the installation section 302 from the port near the power head 10.

[0157] Step 2: Connect the coupling tube 520 of the coupling 50 to the end of the first drive shaft 410 near the power head 10, and push the coupling 50 to drive the first drive shaft 410 to move away from the power head 10 relative to the mounting section 302.

[0158] Step 3: Connect the installation section 302 to the installation part of the power head 10 until it is in place;

[0159] Step 4: Install the telescopic tube section 301, the second drive shaft 420, and the working head 20 into place.

[0160] It is understandable that during the process of pushing the coupling 50 to drive the transmission shaft 40 (such as the first transmission shaft) relative to the extension tube 30 (such as the installation section) in a direction away from the power head 10, due to the blind insertion, the coupling 50 and the power output end of the motor may not be properly aligned. That is, the connecting shaft of the coupling 50 (such as the shaft of the coupling part) is not inserted into the shaft hole of the power output end of the motor (such as the coupling). Repeated trial insertion is required. During the trial insertion, the transmission shaft 40 may be excessively pushed by the length of the shaft hole of the power output end of the motor. Therefore, the transmission shaft limiting part 401 (such as the limiting ring) may slip from its original limiting position (such as the limiting groove) due to the axial force of the transmission shaft stop part 80 (such as the bearing sleeve), and lose its axial limiting function for the transmission shaft 40. This may cause the transmission shaft 40 to directly detach from the coupling 50 (the transmission shaft detaches from the coupling tube) or detach from the coupling 50 when the telescopic transmission shaft 40 is stretched, affecting the transmission of power. This application sets a stop part 60 for the coupling 50 to stop and limit the coupling, thereby transferring the axial force that was originally acting on the transmission shaft 40 to the extension tube 30, which can effectively prevent the transmission shaft limiting part 401 from falling off under force.

[0161] In one embodiment, such as Figure 5 and Figure 6 As shown, the coupling stop portion 60 includes a stop surface 601 for cooperating with the stop of the coupling limiting portion 501 and a limiting wall 602 provided at one end of the stop surface 601 near the power head 10. The limiting wall 602 is sleeved on the outer periphery of the coupling 50 to limit the coupling 50 in the radial direction. The projections of the limiting wall 602 and the coupling 50 in the axial direction of the transmission shaft 40 at least partially overlap.

[0162] A bushing 903 is provided between the outer periphery of the coupling 50 and the extension tube 30 to support the coupling 50 and reduce vibration. However, the end of the coupling 50 furthest from the power head 10 may experience radial runout due to the inconvenience of installing the bushing 903, resulting in significant vibration. This embodiment uses a limiting wall 903 to radially limit the end of the coupling 50, thus preventing radial runout and reducing vibration.

[0163] Furthermore, the length of the limiting wall 602 in the axial direction of the drive shaft 40 is greater than the sum of the gap between the power output end of the motor and the coupling 50 in the axial direction of the drive shaft 40 and the gap between the coupling 50 and the drive shaft 40 in the axial direction of the drive shaft 40.

[0164] To ensure reliable tool assembly, a certain clearance is typically maintained between interconnected components. When the drive shaft 40 is subjected to force and moves towards the power head 10, to prevent the end of the coupling 50 from disengaging from the limiting wall 602, which cannot provide radial restraint, this application addresses this by setting the axial length of the limiting wall 602 on the drive shaft 40 to be greater than the sum of the axial clearance between the motor's power output end and the coupling 50 on the drive shaft 40, and the axial clearance between the coupling 50 and the drive shaft 40. This ensures that the coupling 50 will never disengage from the limiting wall 602, thus guaranteeing operational reliability.

[0165] In one specific embodiment, such as Figures 7 to 9 As shown, the bearing sleeve 701 includes a rotating support section 7011, a transmission shaft limiting section 7012, and a coupling member limiting section 7013, arranged sequentially along the axial direction of the transmission shaft 40 and gradually away from the power direction. The rotating support section 7011, the transmission shaft limiting section 7012, and the coupling member limiting section 7013 are arranged in a stepped manner. The rotating support section 7011 forms a spline sleeve structure; the transmission shaft limiting section 7012 forms an annular limiting groove structure with a radial stop surface and an axial limiting surface for stopping the transmission shaft limiting member 401; the coupling member limiting section 7013 forms an annular limiting groove structure with a radial stop surface for stopping the coupling member limiting part 501 and an axial limiting surface for limiting the coupling tube 50 in the radial direction. In this embodiment, the radial stop surface of the drive shaft limiting section 7012 is the drive shaft stop part 80, the radial stop surface of the connecting shaft limiting section 7013 is the connecting shaft stop part 60, and the axial limiting surface of the connecting shaft limiting section 7013 is the limiting wall 602.

[0166] In one specific embodiment, the working head 20 is configured as a high-pole saw working head, including a mounting housing 201, a sprocket rotatably supported on the mounting housing 201, a transmission assembly drivingly connected between the sprocket and the power input end of the working head, a guide plate 202 adjustablely supported on the mounting housing 201, a cutting chain 203 wound around the sprocket and guide plate 202, a chain tensioning mechanism, and a guide plate adjusting mechanism. The guide plate adjusting mechanism is used to adjust the distance between the guide plate 202 and the sprocket according to usage requirements. The chain tensioning mechanism is used to adjust the cutting chain 203 to be tensioned between the sprocket and the guide plate 202. The power output from the drive shaft is transmitted to the sprocket through the power input end of the working head and the transmission assembly. The sprocket drives the cutting chain 203 to reciprocate around the sprocket and guide plate 202 to achieve the cutting purpose.

[0167] In one embodiment, the second section 3012 of the telescopic tube section 301 and the second drive shaft 420 are also provided with corresponding drive shaft limiting parts, drive shaft stop parts, connecting shaft limiting parts, and connecting shaft stop parts at the end away from the power head 10 to prevent the second drive shaft from coming out of the second section. The specific implementation method is the same as the aforementioned embodiment, and will not be repeated here.

[0168] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0169] In one embodiment, reference Figures 1 to 6 , Figures 14 to 22 A long-handled tool includes a power head 10, a working head 20, an extension tube 30, a drive shaft 40, and a coupling 50. The power head 10 includes a housing 101 and a motor 102 disposed within the housing 101 for providing driving force; the working head 20 is used to perform working tasks; the extension tube 30 connects the power head 10 and the working head 20; the drive shaft 40 is rotatably disposed in the extension tube 30 for transmitting the driving force of the motor 102 to the working head 20; the coupling 50 is used to connect the power output end of the motor and the drive shaft 40 and transmit torque, and the coupling 50 is movable relative to the extension tube 30 in the axial direction of the drive shaft 40. The extension tube 30 is provided with a coupling stop 60. The coupling 50 includes a coupling limiting part 501. The coupling stop 60 and the coupling limiting part 501 stop and cooperate to limit the movement of the coupling 50 relative to the extension tube 30 in the axial direction away from the power head 10 of the drive shaft 40.

[0170] Furthermore, in one embodiment, a drive shaft stop 80 is also provided inside the extension tube 30, and a drive shaft limiting member 401 is provided on the outer periphery of the drive shaft 40. The drive shaft stop 80 and the drive shaft limiting member 401 cooperate to stop and limit the movement of the drive shaft 40 relative to the extension tube 30 in the axial direction away from the power head 10. The stop of the coupling member stop 60 on the coupling member limiting member 501 can also be used to prevent the stop of the drive shaft stop 80 on the drive shaft limiting member 401 from failing.

[0171] Based on the same inventive concept, this application also provides a high branch saw, including a power head 10, a working head 20, an extension tube 30, and a drive shaft 40. The power head 10 includes a housing 101 and a motor 102 disposed within the housing 101 for providing driving force. The working head 20 is configured to perform cutting tasks. The extension tube 30 is connected between the power head 10 and the working head 20. The drive shaft 40 is rotatably disposed in the extension tube 30 and configured to transmit the driving force of the motor 102 to the working head 20. The high-branch saw also includes a coupling 50 and a coupling stop 60. The coupling 50 is configured to connect the power output end of the motor 102 and the drive shaft 40 and transmit torque. The coupling 50 is at least partially disposed inside the extension tube 30 and is movably disposed relative to the extension tube 30 in the axial direction of the drive shaft 40. The coupling 50 includes a coupling limiting part 501. The coupling stop 60 is at least partially disposed inside the extension tube 30. The coupling stop 60 and the coupling limiting part 501 stop and cooperate to limit the movement of the coupling 50 relative to the extension tube 30 in the axial direction of the drive shaft 40 away from the power head 10.

[0172] Furthermore, the coupling 50 is movably positioned relative to the drive shaft 40 in the axial direction of the drive shaft 40. A drive shaft stop 80 is also provided within the extension tube 30, and a drive shaft limiting member 401 (also called a drive shaft limiting part) is provided on the outer periphery of the drive shaft 40. The drive shaft stop 80 engages with the drive shaft limiting member 401 to limit the axial movement of the drive shaft 40 relative to the extension tube 30 in the direction away from the power head 10. The drive shaft 40 includes a mounting position for installing the drive shaft limiting member 401. The mounting position is configured such that when the drive shaft limiting member 401 is installed in the mounting position and engages with the drive shaft stop 80, the motor 102 can transmit torque to the drive shaft 40 through the coupling 50. The coupling stop 80 limits the coupling limiting member 501 to prevent the drive shaft limiting member 401 from disengaging from the mounting position.

[0173] It should be noted that all the technical features of the above long-handled tool embodiments can be applied to the high-branch saw embodiments and can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0174] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0175] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0176] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0177] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0178] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0179] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. A long-handled tool, comprising: A power head includes a housing and a motor disposed within the housing for providing driving force; The work head is configured to perform work tasks; An extension tube is connected between the power head and the working head; And a drive shaft, rotatably disposed in the extension tube, configured to transmit the driving force of the motor to the working head; The long-handled tool is characterized in that it further includes: A coupling, configured to connect the power output end of the motor and the drive shaft and transmit torque, the coupling being at least partially disposed within the extension tube and axially movable relative to the extension tube on the drive shaft, the coupling including a coupling limiting portion; and A coupling stop portion is at least partially disposed inside the extension tube. The coupling stop portion cooperates with the coupling limiting portion to limit the movement of the coupling relative to the extension tube in the axial direction of the transmission shaft away from the power head.

2. The long-handled tool according to claim 1, characterized in that, The coupling is movable relative to the transmission shaft in the axial direction of the transmission shaft; The extension tube is also provided with a drive shaft stop, and the outer periphery of the drive shaft is provided with a drive shaft limiting member. The drive shaft stop and the drive shaft limiting member stop and cooperate to limit the movement of the drive shaft relative to the extension tube in the axial direction away from the power head. The drive shaft includes an installation position for mounting the drive shaft limiting member. The installation position is configured such that when the drive shaft limiting member is installed at the installation position and cooperates with the drive shaft stop to stop, the motor can transmit torque to the drive shaft through the coupling. The stop portion of the coupling component stops and limits the limiting portion of the coupling component to protect the transmission shaft limiting component from detaching from the installation position.

3. The long-handled tool according to claim 2, characterized in that, The coupling includes a rear contact end face for abutting against the drive shaft in the axial direction of the drive shaft, and the drive shaft includes a front contact end face for abutting against the rear contact end face; When the coupling stop portion stops the coupling limiting portion, and the transmission shaft limiting portion is located in the installation position, the distance between the rear edge of the rear contact end face of the coupling portion and the front edge of the transmission shaft stop portion is not less than the distance between the front edge of the front contact end face of the transmission shaft and the rear edge of the transmission shaft limiting portion.

4. The long-handled tool according to claim 2, characterized in that, The coupling includes a rear contact end face for abutting against the drive shaft in the axial direction of the drive shaft, and the drive shaft includes a front contact end face for abutting against the rear contact end face; When the coupling stop portion stops the coupling limiting portion, there is a gap between the rear edge of the rear contact end face of the coupling and the front edge of the front contact end face of the drive shaft and / or between the rear edge of the drive shaft limiting portion and the front edge of the drive shaft stop portion.

5. The long-handled tool according to claim 2, characterized in that, When the coupling stop portion stops the coupling limiting portion, in the axial direction of the transmission shaft, the gap between the rear end face of the coupling member away from the power head and the transmission shaft stop portion is not less than the distance between the front edge of the transmission shaft limiting portion near the power head and the rear edge away from the power head.

6. The long-handled tool according to claim 1 or 2, characterized in that, The coupling stop is disposed on a support member for supporting the drive shaft; Alternatively, the stop portion of the coupling is configured to be connected to the extension tube and protrude from the inner wall of the extension tube; Alternatively, the end of the extension tube away from the power head is provided with an end stop, and the coupling stop is configured to slide along the axial direction of the transmission shaft inside the extension tube and is located between the coupling and the end stop.

7. The long-handled tool according to claim 6, characterized in that, A limiting groove is provided circumferentially on the outer wall of the drive shaft. The drive shaft limiting member is configured as a limiting ring sleeved on the outer circumference of the drive shaft and locked in the limiting groove. The limiting ring protrudes from the outer wall of the drive shaft. The support member includes a bearing sleeve, which is disposed inside the extension tube and rotatably disposed relative to the extension tube. The bearing sleeve is sleeved on the outer circumference of the drive shaft and is slidably inserted into and synchronously rotated with the drive shaft to allow relative axial movement between the drive shaft and the bearing sleeve and to restrict relative rotation between the drive shaft and the bearing sleeve in the circumferential direction. Both the coupling stop and the transmission shaft stop are provided on the bearing sleeve and are offset radially from each other on the bearing sleeve.

8. The long-handled tool according to claim 1, characterized in that, The coupling includes a coupling part for mating with the power output end of the motor and a coupling tube for mating with the transmission shaft, wherein the coupling part and the coupling tube are fixedly connected relative to each other. The coupling part has a connecting shaft at one end near the power head, and the power output end of the motor has a connecting shaft hole at one end away from the power head that mates with the connecting shaft. The coupling part is connected to the power output end of the motor through the mating of the connecting shaft and the connecting shaft hole. The end of the coupling tube near the power head is fixedly connected to the coupling part, and the end away from the power head is sleeved on the outer periphery of the transmission shaft. The limiting part of the coupling component is configured as the end face of the coupling tube away from the power head.

9. The long-handled tool according to claim 2, characterized in that, The extension tube includes at least a first extension section near the power head, a second extension section telescopically connected to the first extension section, and a locking device for positioning and locking the first extension section and the second extension section relative to each other. The drive shaft includes at least a first drive shaft near the power head and a second drive shaft that is telescopically connected to the end of the first drive shaft away from the power head. The first drive shaft is rotatably disposed in the first extension section. The connecting shaft, the connecting shaft stop, and the drive shaft stop are all disposed in the first extension section. The drive shaft limiting member is disposed on the first drive shaft and located in the first extension section.

10. A high-branch saw, comprising: A power head includes a housing and a motor disposed within the housing for providing driving force; The working head is configured to perform cutting tasks; An extension tube is connected between the power head and the working head; And a drive shaft, rotatably disposed in the extension tube, configured to transmit the driving force of the motor to the working head; The high-branch saw is characterized in that it further includes: A coupling, configured to connect the power output end of the motor and the drive shaft and transmit torque, the coupling being at least partially disposed within the extension tube and axially movable relative to the extension tube on the drive shaft, the coupling including a coupling limiting portion; and A coupling stop portion is at least partially disposed inside the extension tube. The coupling stop portion cooperates with the coupling limiting portion to limit the movement of the coupling relative to the extension tube in the axial direction of the transmission shaft away from the power head.

Images