Long pole tool and lopper saw

Abstract

The invention 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] The present application relates to the technical field of garden tools, and in particular to a long-pole tool and a high-branch saw. Background Art

[0002] Long-handled tools, such as pole saws, pole shears, and lawn mowers, typically consist of a power head, a working head, an extension tube interposed between the power head and the working head, and a drive shaft rotatably mounted within the extension tube. To facilitate transport, the power head, working head, extension tube, and drive shaft are typically detachable from one another. The extension tube and drive shaft can also be constructed in sections, allowing for assembly and disassembly.

[0003] During assembly, since the drive shaft is connected to the power output end of the motor through a coupling and can transmit torque, there is a plug-in fitting structure between them that needs to be aligned for installation. Therefore, during assembly, it may be plugged in in a state of incorrect alignment, resulting in the drive shaft being applied with an axial thrust away from the power head and excessive axial displacement, affecting power transmission. Summary of the Invention

[0004] The purpose of the present application is to provide a long-pole tool and a high-branch saw, which can prevent the transmission shaft from being excessively displaced during the tool assembly process and affecting power transmission.

[0005] This application adopts the following technical solutions:

[0006] The present application provides a long-pole tool, comprising:

[0007] The power head comprises a housing and a motor disposed in the housing for providing driving force;

[0008] a work head configured to perform a work task;

[0009] an extension pipe connected between the power head and the working head;

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

[0011] The long-pole tool also includes:

[0012] a coupling configured to connect the power output end of the motor and the transmission shaft and transmit torque, the coupling being at least partially disposed within the extension tube and movable relative to the extension tube in the axial direction of the transmission shaft, the coupling including a coupling stop; and

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

[0014] The long-rod tool of the present application can avoid excessive axial displacement of the transmission shaft due to insertion in an incorrectly aligned state during the tool assembly process, thereby affecting power transmission, by arranging a coupling stop portion in the extension tube and cooperating the coupling stop portion with the coupling limit portion stop.

[0015] In one embodiment, the coupling is arranged to move relative to the transmission shaft in the axial direction of the transmission shaft;

[0016] A transmission shaft stopper is further provided in the extension tube, and a transmission shaft limiting member is provided on the outer periphery of the transmission shaft. The transmission shaft stopper cooperates with the transmission shaft limiting member to limit the movement of the transmission shaft relative to the extension tube in the axial direction of the transmission shaft in a direction away from the power head;

[0017] The transmission shaft includes an installation position for installing the transmission shaft stopper, and the installation position is configured such that when the transmission shaft stopper is installed in the installation position and engages with the transmission shaft stopper to stop, the motor can transmit torque to the transmission shaft through the coupling;

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

[0019] The long-pole tool of the present application can prevent the transmission shaft limiter from being forced out of the installation position due to excessive pushing of the transmission shaft by the coupling during the tool assembly process by arranging a coupling stop portion in the extension tube and making the coupling stop portion cooperate with the coupling limit portion stop of the coupling, thereby ensuring the axial limiting effect of the transmission shaft limiter on the transmission shaft, so that the transmission shaft will not move excessively axially and affect power transmission during the telescopic adjustment or disassembly of the long-pole tool.

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

[0021] When the coupling stop portion stops the coupling limit portion, the distance between the rear edge of the rear contact end surface of the coupling 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 surface of the transmission shaft and the rear edge of the transmission shaft limit portion.

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

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

[0024] In one embodiment, the transmission shaft stopper stops the transmission shaft limiter before the coupling stopper stops the coupling limiter.

[0025] The transmission shaft stopper is configured to stop the transmission shaft limiter in such a manner that the transmission shaft stopper abuts against the transmission shaft limiter and movement of the transmission shaft limiter relative to the extension tube in the axial direction of the transmission shaft in a direction away from the power head is restricted;

[0026] The coupling stop portion is configured to stop the coupling limiting portion as follows: the coupling stop portion abuts against the coupling limiting portion and the coupling limiting portion is restricted from moving relative to the extension tube in the axial direction of the transmission shaft in a direction away from the power head.

[0027] In one embodiment, the coupling stop portion and the coupling limiting portion are configured as follows: when the coupling stop portion stops the coupling limiting portion, the pressure applied by the transmission shaft stop portion to the transmission shaft limiting portion in the axial direction of the transmission shaft toward the power head is no greater than the friction force exerted on the transmission shaft limiting portion in the opposite direction.

[0028] In one embodiment, there is a gap between at least one of the rear edge of the rear contact end surface of the coupling and the front edge of the front contact end surface of the transmission shaft and between the rear edge of the transmission shaft limiter and the front edge of the transmission shaft stop portion.

[0029] In one embodiment, when the coupling stop portion stops the coupling limit portion, in the axial direction of the transmission shaft, the gap between the rear end surface of the coupling 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 limit portion close to the power head and the rear edge away from the power head.

[0030] In one embodiment, the coupling stopper is arranged on a support member for supporting the transmission shaft;

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

[0032] Alternatively, an end stop is provided at one end of the extension tube away from the power head, and the coupling stop portion is configured to be slidably disposed in the extension tube along the axial direction of the transmission shaft and disposed between the coupling and the end stop.

[0033] In one embodiment, a limiting groove is provided on the outer wall of the transmission shaft along the circumferential direction, and the transmission shaft limiting member is configured as a limiting ring which is sleeved on the outer circumference of the transmission shaft and clamped in the limiting groove, and the limiting ring is provided to protrude from the outer wall of the transmission shaft;

[0034] The support member includes a bearing sleeve, which is arranged in the extension tube and is rotatable relative to the extension tube. The bearing sleeve is sleeved on the outer periphery of the transmission shaft, and is slidably plugged and synchronously rotated with the transmission shaft to allow relative movement of the transmission shaft and the bearing sleeve in the axial direction and limit relative rotation of the transmission shaft and the bearing sleeve in the circumferential direction.

[0035] The coupling stop portion and the transmission shaft stop portion are both arranged on the bearing sleeve and staggered in the radial direction of the bearing sleeve.

[0036] In one embodiment, the coupling stop portion and the transmission shaft stop portion are staggered in the axial direction of the transmission shaft, and the coupling stop portion is closer to the power head than the transmission shaft stop portion.

[0037] In one embodiment, the power output end of the motor is slidably plugged into the coupling and is synchronously rotated via a guide structure to allow relative movement of the power output end of the motor and the coupling in the axial direction and to limit relative rotation of the power output end of the motor and the coupling in the circumferential direction to transmit torque.

[0038] In one embodiment, the coupling is slidably plugged into the transmission shaft and is synchronously rotated via a guide structure to allow relative movement of the coupling and the transmission shaft in the axial direction and to limit relative rotation of the coupling and the transmission shaft in the circumferential direction to transmit torque.

[0039] In one embodiment, the coupling comprises a coupling portion for coupling with the power output end of the motor and a coupling tube for coupling with the transmission shaft, wherein the coupling portion and the coupling tube are relatively fixedly connected;

[0040] The coupling portion is provided with a connecting shaft at one end close to the power head, and the power output end of the motor is provided with a connecting shaft hole matched with the connecting shaft at one end away from the power head, and the coupling portion is connected to the power output end of the motor through the matching of the connecting shaft and the connecting shaft hole;

[0041] One end of the coupling tube close to 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, and the coupling limiting part 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 close to the power head, a second extension section telescopically connected to the first extension section, and a locking device for relative positioning and locking the first extension section and the second extension section;

[0043] The transmission shaft at least includes a first transmission shaft close to the power head and a second transmission shaft telescopically sleeved with an end of the first transmission shaft away from the power head;

[0044] The first transmission shaft is rotatably arranged in the first extension section, the coupling, the coupling stopper, and the transmission shaft stopper are all arranged in the first extension section, and the transmission shaft limiter is arranged on the first transmission shaft and located in the first extension section.

[0045] In one embodiment, the extension tube includes a telescopic section and a mounting section disposed between the power head and the telescopic section, wherein the telescopic section includes at least a first section proximate to the power head, a second section slidably sleeved with the first section, and a locking device for locking the first section relative to the second section.

[0046] The transmission shaft at least includes a first transmission shaft close to the power head and a second transmission shaft slidably sleeved with an end of the first transmission shaft away from the power head;

[0047] The first transmission shaft is rotatably disposed in the installation section, the coupling, the coupling stopper, and the transmission shaft stopper are all disposed in the installation section, and the transmission shaft limiter is disposed on the first transmission shaft and is 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 coupling limit portion stop and a limit wall provided at one end of the stop surface close to the power head, the limit wall is sleeved on the outer periphery of the coupling for limiting the coupling in the radial direction, and the projection of the limit wall and the coupling in the axial direction of the transmission shaft at least partially overlap.

[0050] In one embodiment, 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.

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

[0052] The present application also provides a high-branch saw, comprising:

[0053] The power head comprises a housing and a motor disposed in the housing for providing driving force;

[0054] a working head configured to perform a cutting task;

[0055] an extension pipe connected between the power head and the working head;

[0056] and a transmission shaft rotatably disposed in the extension tube and 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 transmission shaft and transmit torque, the coupling being at least partially disposed within the extension tube and movable relative to the extension tube in the axial direction of the transmission shaft, the coupling including a coupling stop; and

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

[0060] The present application provides a long-pole tool, comprising:

[0061] The power head comprises a housing and a motor disposed in the housing for providing driving force;

[0062] Working head, used to perform work tasks;

[0063] an extension pipe connected between the power head and the working head;

[0064] and a transmission shaft rotatably disposed in the extension tube and configured to transmit the driving force of the motor to the working head;

[0065] The long-pole tool further includes a coupling, the coupling being used to connect the power output end of the motor and the transmission shaft and transmit torque, the coupling being arranged to move in the axial direction of the transmission shaft relative to the extension tube;

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

[0067] In one embodiment, a transmission shaft stopper is further provided in the extension tube, and a transmission shaft limiting portion is provided on the outer periphery of the transmission shaft, wherein the transmission shaft stopper cooperates with the transmission shaft limiting portion to limit the movement of the transmission shaft relative to the extension tube in the axial direction of the transmission shaft in a direction away from the power head;

[0068] The stopping of the coupling stopper on the coupling limiter is used to prevent the transmission shaft stopper from failing to stop the transmission shaft limiter.

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

[0070] When the coupling stop portion stops the coupling limit portion, the distance between the rear edge of the rear contact end surface of the coupling 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 surface of the transmission shaft and the rear edge of the transmission shaft limit portion.

[0071] In one embodiment, the transmission shaft stop portion stops the transmission shaft limiting portion before the coupling stop portion stops the coupling limiting portion.

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

[0073] The coupling stop portion is configured to stop the coupling limiting portion as follows: the coupling stop portion abuts against the coupling limiting portion and the coupling limiting portion is restricted from moving relative to the extension tube in the axial direction of the transmission shaft in a direction away from the power head.

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

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

[0076] In one embodiment, the coupling stop portion and the coupling limiting portion are configured as follows: when the coupling stop portion stops the coupling limiting portion, the pressure applied by the transmission shaft stop portion to the transmission shaft limiting portion in the axial direction of the transmission shaft toward the power head is no greater than the friction force exerted on the transmission shaft limiting portion in the opposite direction.

[0077] In one embodiment, the coupling stopper is arranged on a support member for supporting the transmission shaft;

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

[0079] Alternatively, an end stop is provided at one end of the extension tube away from the power head, and the coupling stop portion is configured to be slidably disposed in the extension tube along the axial direction of the transmission shaft and disposed between the coupling and the end stop.

[0080] In one embodiment, a limiting groove is provided on the outer wall of the transmission shaft along the circumferential direction, and the transmission shaft limiting portion is configured as a limiting ring which is sleeved on the outer circumference of the transmission shaft and clamped in the limiting groove, and the limiting ring is provided to protrude from the outer wall of the transmission shaft;

[0081] The support member includes a bearing sleeve, which is arranged in the extension tube and is rotatable relative to the extension tube. The bearing sleeve is sleeved on the outer periphery of the transmission shaft, and is slidably plugged and synchronously rotated with the transmission shaft to allow relative movement of the transmission shaft and the bearing sleeve in the axial direction and limit relative rotation of the transmission shaft and the bearing sleeve in the circumferential direction.

[0082] The coupling stop portion and the transmission shaft stop portion are both arranged on the bearing sleeve and staggered in the radial direction of the bearing sleeve.

[0083] In one embodiment, the coupling stop portion and the transmission shaft stop portion are staggered in the axial direction of the transmission shaft, and the coupling stop portion is closer to the power head than the transmission shaft stop portion.

[0084] In one embodiment, the power output end of the motor is slidably plugged into the coupling and is synchronously rotated via a guide structure to allow relative movement of the power output end of the motor and the coupling in the axial direction and to limit relative rotation of the power output end of the motor and the coupling in the circumferential direction to transmit torque.

[0085] In one embodiment, the coupling is slidably plugged into the transmission shaft and is synchronously rotated via a guide structure to allow relative movement of the coupling and the transmission shaft in the axial direction and to limit relative rotation of the coupling and the transmission shaft in the circumferential direction to transmit torque.

[0086] In one embodiment, the coupling comprises a coupling portion for coupling with the power output end of the motor and a coupling tube for coupling with the transmission shaft, wherein the coupling portion and the coupling tube are relatively fixedly connected;

[0087] The coupling portion is provided with a connecting shaft at one end close to the power head, and the power output end of the motor is provided with a connecting shaft hole matched with the connecting shaft at one end away from the power head, and the coupling portion is connected to the power output end of the motor through the matching of the connecting shaft and the connecting shaft hole;

[0088] One end of the coupling tube close to 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, and the coupling limiting part 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 limit portion, in the axial direction of the transmission shaft, a gap C1 between the rear end surface of the coupling away from the power head and the transmission shaft stop portion is greater than a distance C2 between a front edge of the transmission shaft limit portion close to the power head and a rear edge away from the power head.

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

[0091] In one embodiment, the extension tube includes a telescopic section and a mounting section disposed between the power head and the telescopic section, wherein the telescopic section includes at least a first section proximate to the power head, a second section slidably sleeved with the first section, and a locking device for locking the first section relative to the second section.

[0092] The transmission shaft at least includes a first transmission shaft close to the power head and a second transmission shaft slidably sleeved with an end of the first transmission shaft away from the power head;

[0093] The first transmission shaft is rotatably disposed in the installation section, the coupling, the coupling stopper, and the transmission shaft stopper are all disposed in the installation section, and the transmission shaft limiting portion is disposed on the first transmission shaft and is 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0096] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

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

[0098] Figure 2 is a top view of a long-pole tool in one embodiment of the present application;

[0099] Figure 3 is a cross-sectional view of a long-pole tool in one embodiment of the present 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 disassembled structure of a long-pole tool in an embodiment of the present application in a partially installed state;

[0102] Figure 6 1 is a schematic structural diagram of a long-pole tool in an embodiment of the present application in an unsecured assembly state;

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

[0104] Figure 8 is a perspective view of a bearing sleeve in an embodiment of the present application at a first viewing angle;

[0105] Figure 9 is a perspective view of a bearing sleeve in an embodiment of the present application at a second viewing angle;

[0106] Figure 10 is a cross-sectional view of a long-pole tool in another embodiment of the present application;

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

[0108] Figure 12 is a cross-sectional view of a long-pole tool in yet another embodiment of the present application;

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

[0110] Figure 14 is a partial cross-sectional structural diagram of a long-pole tool in one embodiment of the present application;

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

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

[0113] Figure 17 yes Figure 14 Enlarged view of point F in the middle;

[0114] Figure 18 is a partial structural cross-sectional view of a long-pole tool in an embodiment of the present application in an unassembled state;

[0115] Figure 19 is a partial structural cross-sectional view of a long-pole tool in one embodiment of the present application;

[0116] Figure 20 is a partial structural perspective view of a long-pole tool in one embodiment of the present application;

[0117] Figure 21 This is a partial structural cross-sectional view of a long-pole tool in an embodiment of the present application in a state where there is a gap between the transmission shaft limiter and the transmission shaft stop portion;

[0118] Figure 22 This is a partial structural cross-sectional view of a long-rod tool in an embodiment of the present application when there is a gap between the coupling and the transmission shaft. DETAILED DESCRIPTION

[0119] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0120] Long-handled tools in the related art, such as pole saws, pole shears, and lawn mowers, are commonly used for trimming lawns, shrubs, and trees. These tools typically include a power unit, a working head, an extension tube disposed between the power unit and the working head, and a drive shaft rotatably disposed within the extension tube. The power unit includes a motor for powering the working head. The drive shaft is connected to the motor's power output via a coupling and is capable of transmitting torque to the working head. To facilitate transportation, the power unit, working head, extension tube, and drive shaft are typically arranged so that they are relatively removable. The extension tube and drive shaft are arranged in sections, each section being assembled and disassembled. Because the drive shaft is connected to the motor's power output via a coupling and capable of transmitting torque, the coupling and the shaft require a plug-in fit that requires alignment during assembly. Assembly is typically performed blindly, and the connecting shaft and shaft hole may not align correctly, requiring repeated trial insertions. During these trial insertions, the drive shaft may be inserted while misaligned, causing the coupling to push against it, resulting in excessive axial displacement due to a significant axial thrust away from the power unit. This can affect power transmission and complicate installation.

[0121] To address the above-mentioned issues, the present application provides a long-pole tool that prevents excessive axial displacement of the drive shaft from affecting power transmission and is easy to install. The following uses a high-branch saw as an example to illustrate the structure of the long-pole tool of the present application. This example is merely an example and does not limit the technical scope of the present application.

[0122] In one embodiment, reference Figures 1 to 6 、 Figures 14 to 22 A long-pole tool includes a power head 10, a working head 20, an extension tube 30, and a transmission 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 is connected between the power head 10 and the working head 20; and the transmission shaft 40 is rotatably disposed within the extension tube 30 and configured to transmit the driving force of the motor 102 to the working head 20.

[0123] The long-pole tool also includes a coupling 50 and a coupling stop 60. The coupling 50 is configured to connect the power output 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 movable relative to the extension tube 30 in the axial direction of the drive shaft 40. The coupling 50 includes a coupling stop 501. The coupling stop 60 is at least partially disposed within the extension tube 30 and engages with the coupling stop 501 to limit 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.

[0124] Among them, the coupling 50 and the coupling stop 60 are at least partially arranged in the extension tube 30. It can be understood that: the coupling 50 and the coupling stop 60 can be completely located in the extension tube 30; or only a part is located in the extension tube 30, and the other part is located outside the extension tube 30. As an example, a part of the coupling 50 is located in the extension tube 30 and a part is located in the power head 10, and the coupling stop 60 extends from the outside of the extension tube 30 into the extension tube 30 and is fixed, and a part is located in the extension tube 30 and a part is located outside the extension tube 30.

[0125] It can be understood that by setting the coupling stop part 60 and the coupling limiting part 501 to cooperate with the 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, which can prevent the drive shaft 40 from being excessively pushed out of the appropriate installation position by the coupling 50 during the tool assembly process, ensuring reliable torque transmission and facilitating installation.

[0126] Specifically, refer to Figures 5 to 9 In this embodiment, the motor 102 is fixedly mounted in the housing 101. A coupling 1022 for coupling 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 power input end of the working head. The transmission shaft 40 is rotatably disposed in the extension tube 30 through the support 70. One end of the transmission shaft 40 is connected to the power output end of the motor 102 through 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 embodiments, to achieve tool lightweighting, the coupling 50 and the drive shaft 40 are constructed of different materials. For 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. Consequently, the drive shaft 40 is not directly connected to the power output of the motor 102 but rather to the motor's power output via the coupling 50, better meeting the tool's lightweighting requirements.

[0128] Furthermore, the power output end of the motor 102 is slidably plugged into the coupling 50 and synchronously rotated via a guide structure, allowing relative axial movement of the power output end of the motor 102 and the coupling 50 while restricting relative circumferential rotation thereof to transmit torque. Specifically, the coupling 50 and the power output end of the motor 102 can employ a square shaft and square hole configuration, or a spline shaft and spline sleeve configuration. Any configuration capable of transmitting torque is within the scope of this application.

[0129] Furthermore, the coupling 50 and the drive shaft 40 are slidably plug-fitted and synchronously rotated via a guide structure, allowing relative axial movement of the coupling 50 and the drive shaft 40 while restricting relative circumferential rotation of the coupling 50 and the drive shaft 40 to transmit torque. Specifically, the drive shaft 40 and the coupling 50 may employ a splined shaft or splined sleeve configuration, or a square shaft or square hole configuration. Any configuration capable of transmitting torque is within the scope of this application.

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

[0131] In the related art, by providing a limiter on the transmission shaft and a corresponding stopper in the extension tube, the transmission shaft can be limited from moving axially away from the power head relative to the extension tube to avoid excessive displacement of the transmission shaft and affecting power transmission. In the long-pole tool of the above structure, since the transmission shaft, the coupling and the power output end of the motor need to be able to transmit torque, they have a plug-in fitting structure that needs to be aligned and installed. During assembly, it is usually blind plugged in, and the connecting shaft and the shaft hole may not be correctly aligned, requiring repeated trial plugging. During the trial plugging process, the connection may be made in a state of incorrect alignment, causing the transmission shaft to be pushed by the coupling and subjected to a large axial thrust in the direction away from the power head, causing excessive axial displacement (possibly more than the depth of the shaft hole), causing the limiter to be forced out of the original limit position, losing its effective axial limiting effect on the transmission shaft. Then, when the long-pole tool is telescopically adjusted or disassembled, especially when the telescopic tube is extended, the transmission shaft may be forced to move in the direction away from the power head, resulting in an inability to reliably transmit torque.

[0132] To this end, in some embodiments, the coupling 50 is arranged to be movable 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 limiter 401 (also referred to as a drive shaft limiter) is provided on the outer periphery of the drive shaft 40. The drive shaft stop 80 engages with the drive shaft limiter 401 to limit movement of the drive shaft 40 relative to the extension tube 30 in the axial direction of the drive shaft 40 away from the power head 10. The drive shaft 40 includes a mounting position for mounting the drive shaft limiter 401. The mounting position is configured such that when the drive shaft limiter 401 is installed in the mounting position and engages with the drive shaft stop 80 to stop, the motor 102 can transmit torque to the drive shaft 40 through the coupling 50. The coupling stop 80 stops and limits the coupling limiter 501 to prevent the drive shaft limiter 401 from dislodging from the mounting position. As an example, the installation position is configured as a limiting groove 403 provided on the outer wall of the transmission shaft for installing the transmission shaft limiting member 401.

[0133] It can be understood that by setting the coupling stop part 60 and the coupling limiting part 501 to cooperate with the 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, which can avoid the drive shaft 40 being pushed vigorously by the coupling 50 during the tool assembly process and excessive axial displacement in the direction away from the power head 10, ensuring that the drive shaft limiting part 401 can always remain in the installed position, effectively limiting the drive shaft, and then when the long rod tool is telescopically adjusted or disassembled, especially when the telescopic tube is extended, the drive shaft will not be excessively displaced in the direction away from the power head, and the torque can be reliably transmitted.

[0134] In addition, compared with the existing technology, on the one hand, the present application has low strength requirements for the transmission shaft limiter, and it only needs to be able to effectively limit the position during telescopic adjustment or disassembly, and does not need to be able to withstand strong pressure during assembly. Therefore, the transmission shaft limiter has lower cost and the assembly process of the transmission shaft limiter is simpler; on the other hand, the present application has low precision requirements for assembly tools and assembly processes, low equipment costs, and tool assembly is simpler and more reliable.

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

[0136] In one embodiment, referring to Figure 19When the coupling stop 60 is abutting the coupling limiter 501, the distance L1 between the rear edge of the rear contact end surface 502 of the coupling 50 and the front edge of the drive shaft stop 80 is no less than the distance L2 between the front edge of the front contact end surface 402 of the drive shaft 40 and the rear edge of the drive shaft limiter 401. This embodiment prevents the coupling 50 from exerting an axial thrust on the drive shaft 40 after reaching the stop position. This prevents the coupling 50 from excessively pushing the drive shaft 40, which could cause the drive shaft limiter 401 to slip from its original restraining position, thereby losing its axial restraining function on the drive shaft 40 and easily causing the drive shaft 40 to move out of its proper installation position, affecting torque transmission.

[0137] In one embodiment, when the coupling stopper 60 stops the coupling limiting portion 501, a gap exists between the rear edge of the rear contact end surface 502 of the coupling 50 and the front edge of the front contact end surface 402 of the transmission shaft 40, and / or between the rear edge of the transmission shaft limiting portion 401 and the front edge of the transmission shaft limiting portion 80. That is, a gap exists between at least one of the rear edge of the rear contact end surface 502 of the coupling 50 and the front edge of the front contact end surface 402 of the transmission shaft 40, and between the rear edge of the transmission shaft limiting portion 401 and the front edge of the transmission shaft limiting portion 80. The gap between the rear edge of the rear contact end surface 502 of the coupling 50 and the front edge of the front contact end surface 402 of the transmission shaft 40 is D1, and the gap between the rear edge of the transmission shaft limiting portion 401 and the front edge of the transmission shaft limiting portion 80 is D2. This embodiment can prevent the coupling 50 from continuing to apply axial thrust to the drive shaft 40 after reaching the stop position, thereby preventing the coupling 50 from excessively pushing the drive shaft 40, causing the drive shaft limiter 401 to slip from the original limit position under force, thereby losing the axial limiting effect on the drive shaft 40, and making the drive shaft 40 easily deviate from the appropriate installation position, affecting torque transmission.

[0138] In one embodiment, the transmission shaft stopper 80 stops the transmission shaft limiter 401 before the coupling stopper 60 stops the coupling limiter 501. It should be noted that the transmission shaft stopper 60 stops the transmission shaft limiter 501 in the following manner: the transmission shaft stopper 80 abuts against the transmission shaft limiter 501, and the transmission shaft limiter 401 is restricted from moving in the axial direction of the transmission shaft 40 away from the power head 10 relative to the extension tube 30; and the coupling stopper 60 stops the coupling limiter 501 in the following manner: the coupling stopper 60 abuts against the coupling limiter 501, and the movement of the coupling limiter 501 in the axial direction of the transmission shaft 40 away from the power head 10 relative to the extension tube 30 is restricted. This embodiment can prevent the transmission shaft limiter 401 from reaching the stop position before the coupling limiter 501, thereby ensuring that the transmission shaft limiter 401 does not contact the transmission shaft stopper 80 or does not continue to apply pressure after contact, thereby preventing the transmission shaft limiter 401 from slipping from the original limit position under force, ensuring the axial limiting effect on the transmission shaft 40, and ensuring that the transmission shaft 40 is always in a suitable installation position without affecting torque transmission.

[0139] In one embodiment, the coupling stop 60 and the coupling limiter 501 are configured such that, when the coupling stop 60 is blocking the coupling limiter 501, the pressure applied by the drive shaft stop 80 to the drive shaft limiter 401 in the axial direction of the drive shaft 40 toward the power head 10 is no greater than the frictional force exerted on the drive shaft limiter 401 in the opposite direction. By blocking the coupling 50, this embodiment prevents the drive shaft limiter 401 from shifting and slipping from its original limited position. This ensures the axial limiting effect on the drive shaft 40, ensuring that the drive shaft 40 is always in a properly installed position without affecting torque transmission.

[0140] Further, refer to Figure 4 In one embodiment, when the coupling stopper 60 is in contact with the coupling limiter 501, the gap C1 between the rear end surface of the coupling 50, distal to the power head 10, and the transmission shaft stopper 80 in the axial direction of the drive shaft 40 is no less than the distance C2 between the front edge of the transmission shaft limiter 401, proximate to the power head 10, and the rear edge thereof, distal to the power head 10. This embodiment prevents the coupling 50 and the transmission shaft stopper 80 from exerting pressure on the transmission shaft limiter 401 in the axial direction of the drive shaft 40. Preferably, when the coupling stopper 60 is in contact with the coupling limiter 501, the gap C1 between the rear end surface of the coupling 50, distal to the power head 10, and the transmission shaft stopper 80 in the axial direction of the drive shaft 40 is greater than the distance C2 between the front edge of the transmission shaft limiter 401, proximate to the power head 10, and the rear edge thereof, distal to the power head 10.

[0141] It can be understood that the positioning position of the coupling 50 after being stopped by the coupling stop part 60 needs to ensure that the tool can be reliably assembled, that is, the power transmission between the power output end of the motor, 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 transmission shaft 40 , in addition to the thrust force directly acting on the transmission shaft 40 , other friction forces are insufficient to cause the transmission shaft limiter 401 to slip from the original limit position.

[0143] In one embodiment, referring to Figure 21 and Figure 22 The coupling 50 includes a rear contact end face 502 for abutting the transmission shaft 40 in the axial direction of the transmission shaft 40, and the transmission shaft 40 includes a front contact end face 402 for abutting the rear contact end face 502. The coupling 50 includes a front abutting end face for abutting the power output end of the motor 102. When the transmission shaft stopper 80 stops the transmission shaft limiter 401, a first gap D1 is formed 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 transmission shaft 40. The power output end of the motor has a plug-in end face P1, and the plug-in end face P1 is configured as: when the coupling 50 and the power output end of the motor are plugged in, the radial end face where the front edge of the coupling 50 is located. A second gap is formed 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 its end near the power head 10. The motor's power output end, at its end away from the power head 10, has a connecting shaft hole 1023 that 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 no greater than the axial depth D3 of the connecting shaft 5101 of the coupling 50 extending into the connecting shaft hole of the power output end of the motor 102 when the coupling 50 and the motor's power output end are properly plugged in.

[0144] Furthermore, if Figure 3 、 Figures 14 to 16As shown, the extension tube 30 includes at least a first extension section 310 proximate to the power head 10, a second extension section 320 telescopically coupled to the first extension section 310, and a locking device 330 for locking the first extension section 310 relative to the second extension section 320. The drive shaft 40 includes at least a first drive shaft 410 proximate to the power head 10, and a second drive shaft 420 telescopically coupled to an end of the first drive shaft 410 distal from the power head. The first drive shaft 410 is rotatably disposed within the first extension section 310. The coupling 50, coupling stop 60, and drive shaft stop 80 are all disposed within the first extension section 310. The drive shaft stop 401 is disposed on the first drive shaft 410 and located within the first extension section 310.

[0145] As an example, the first extension section 310 includes a mounting section 302 proximal to the power head 10 and a first section 3011 connected to the mounting section 302 at an end distal to the power head. The mounting section 302 and the first section 3011 are detachably connected via a fastener 303. The second extension section 320 includes a second section 3012 that is telescopically coupled to the first section 3011. A locking device 330 positions and locks the first and second sections 3011 relative to each other. The first transmission shaft 410 is rotatably disposed within the mounting section 302. The coupling 50, coupling stop 60, and transmission shaft stop 80 are all disposed within the mounting section 302. The transmission shaft limiter 401 is disposed on the first transmission shaft 410 and is located within the mounting section 302. Specifically, the fastener 303 and the locking device 330 both utilize clamps.

[0146] In one embodiment, 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 proximal to the power head 10, a second section 3012 slidably coupled to the first section 3011, and a locking device 3013 for locking the first and second sections 3011 relative to each other. The drive shaft 40 includes at least a first drive shaft 410 proximal to the power head 10 and a second drive shaft 420 slidably coupled to the end of the first drive shaft 410 distal to the power head 10. The mounting section 302 is detachably connected to the first section 3011 of the telescopic section 301 via a fastener 303. In other words, the extension tube 30 and drive shaft 40 of the long-pole tool of 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 transmission shaft 40 includes a first transmission shaft 410 and a second transmission shaft 420. The mounting section 302 is detachably connected to the first section 3011 of the telescopic section 301 via a clamp. The first section 3011 and the second section 3012 are relatively positioned and locked by the clamp. That is, the fastener 303 and the locking device 3013 are both clamps.

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

[0148] The mounting section 302 is provided close to the power head 10, and the handle 901 for holding and the control module 902 are usually installed on the mounting section 302. It is understandable that after the tool is assembled, since no adjustment is required between the mounting section 302 and the power head 10, the mounting section 302 is usually not frequently disassembled from the power head 10. During assembly, in order to ensure reliable transmission of torque, it is usually desired that the first transmission shaft 410 can be maintained in the correct installation position in the mounting section 302 and can always transmit torque. Therefore, a transmission shaft limiter 401 and a transmission shaft stopper 80 are provided to prevent the first transmission shaft 410 from being subjected to an axial force away from the power head 10 when the telescopic section 301 is extended or disassembled, thereby deviating from the correct installation position and causing power to be unable to be transmitted.

[0149] Specifically, in one embodiment, a limiting groove 403 is circumferentially provided on the outer wall of the transmission shaft 40. The transmission shaft limiting member 401 is configured as a limiting ring that is sleeved around the outer circumference of the transmission shaft 40 and is engaged in the limiting groove 403. The limiting ring protrudes from the outer wall of the transmission shaft 40. To facilitate 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 coupling with the power output end of the motor and a coupling tube 520 for coupling with the drive shaft 40. The coupling portion 510 and the coupling tube 520 are relatively fixedly connected. The coupling portion 510 is provided with a connecting shaft at the end near the power head 10. The power output end of the motor is provided with a connecting shaft hole that cooperates with the connecting shaft 5101 at the end away from the power head 10. The coupling portion 510 is connected to the power output end of the motor through the cooperation 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 circumference of the drive shaft 4. The coupling limit portion 501 is configured as the end surface of the coupling tube 520 away from the power head. Specifically, to transmit torque, in this embodiment, the coupling 510 and the power output end of the motor are connected by a square shaft and square hole, while the transmission shaft 40 and the coupling tube 520 are connected by a spline shaft and spline sleeve. The coupling 510 and the coupling tube 520 are connected by an interference fit or a threaded fit.

[0151] In one embodiment, Figures 5 to 9As shown, the coupling stop 60 is disposed on a support member 70 for supporting the drive shaft 40. Furthermore, the support member 70 includes a bearing sleeve 701, which is disposed within the extension tube 30 and is rotatably mounted relative to the extension tube 30. The bearing sleeve 701 is sleeved around the outer circumference of the drive shaft 40, slidingly engaging with the drive shaft 40 and synchronously rotating therewith, allowing axial relative movement between the drive shaft 40 and the bearing sleeve 701 while restricting circumferential relative rotation between the drive shaft 40 and the bearing sleeve 701. The coupling stop 60 and the drive shaft stop 80 are both disposed on the bearing sleeve 701 and are radially staggered relative to the bearing sleeve 701. The coupling stop 60 and the drive shaft stop 80 are axially staggered relative to each other, 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 spline shaft and spline sleeve matching structure. More specifically, the support member 70 also includes a bearing seat 702 fixedly arranged relative to the extension tube 30 and sleeved on the outer periphery of the bearing sleeve 701, and a rolling element 703 arranged between the bearing seat 702 and the bearing sleeve 701. As an example, the bearing seat 702 can be fixed in the first section 3011 of the aforementioned telescopic section 301, and the end of the installation section 302 away from the power head 10 is embedded between the bearing sleeve 701 and the bearing seat 702, which is conducive to reducing vibration; the bearing seat 702 can also be fixed in the installation section 302 of the aforementioned extension tube 30. The bearing seat 702 can be installed by interference fit or fixed by fasteners, which is not limited here.

[0152] In another embodiment, Figures 10 and 11 As shown, the coupling stopper 60 is configured to be connected to the extension tube 30 and protrude from the inner wall of the extension tube 30. As an example, the coupling stopper 60 is configured to be fixed on the inner wall of the extension tube 30. Specifically, the coupling stopper 60 can be an annular stopper 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 stopper 60 can also be other structures that can stop the coupling limiter 501. It is understandable that the coupling stopper 60 can stop the coupling limiter 501, but does not affect the axial movement of the transmission shaft 40.

[0153] In yet another embodiment, Figures 12 to 13As shown, an end stop is provided at the end of the extension tube 30 away from the power head 10. A coupling stop 60 is configured to slide axially along the drive shaft 40 within the extension tube 30 and is disposed between the coupling 50 and the end stop. Specifically, in this embodiment, the coupling stop 60 is an annular cylindrical body that slides over the outer circumference of the drive shaft 40 and slides within the extension tube 30. It includes a first abutting end for abutting the coupling stop 501 and a second abutting end for abutting the end stop. The end stop can be a support member 70 mounted on 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 arranged in the extension tube 30 and is rotatable relative to the extension tube 30. The bearing sleeve 701 is sleeved on the outer periphery of the transmission shaft 40, and is slidably plugged into and synchronously rotated with the transmission shaft 40 to allow relative movement of the transmission shaft 40 and the bearing sleeve 701 in the axial direction and limit the relative rotation of the transmission shaft 40 and the bearing sleeve 701 in the circumferential direction. The end stop member is specifically configured as the bearing sleeve 701, that is, the coupling stop portion 60 is slidably arranged between the coupling 50 and the bearing sleeve 701, and can abut against the coupling 50 and the bearing sleeve 701.

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

[0155] Long-handled tools are usually assembled as follows:

[0156] Step 1: The operator inserts the first transmission shaft 410 into the installation section 302 from the port of the installation section 302 near one end of the power head 10;

[0157] Step 2: Sleeve the coupling tube 520 of the coupling 50 onto the end of the first transmission shaft 410 close to the power head 10, and push the coupling 50 to move the first transmission shaft 410 relative to the mounting section 302 away from the power head 10;

[0158] Step 3: Plug the installation section 302 into the installation portion of the power head 10 until it is in place;

[0159] Step 4: Install the telescopic pipe section 301, the second transmission shaft 420 and the working head 20 in place.

[0160] It is understandable that in the process of pushing the coupling 50 to drive the drive shaft 40 (such as the first drive shaft) to move relative to the extension tube 30 (such as the installation section) in the direction away from the power head 10, due to blind insertion, the coupling 50 and the power output end of the motor may not be correctly 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), and repeated trial insertion is required. During the trial insertion process, the drive shaft 40 may be pushed excessively by the length of the shaft hole of the power output end of the moving motor, thereby causing the drive shaft limiter 401 (such as a limit ring) to slip from the original limit position (such as a limit groove) due to the axial force of the drive shaft stop part 80 (such as a bearing sleeve), and lose the axial limiting effect on the drive shaft 40, which may cause the drive shaft 40 to directly disengage from the coupling 50 (the drive shaft disengages from the coupling tube) or disengage from the coupling 50 when the telescopic drive shaft 40 is stretched, affecting the transmission of power. The present application provides a coupling stop portion 60 to stop and limit the coupling 50, thereby transferring the axial force originally acting on the transmission shaft 40 to the extension tube 30, which can effectively prevent the transmission shaft limiter 401 from falling off due to the force.

[0161] In one embodiment, Figure 5 and Figure 6 As shown, the coupling stop portion 60 includes a stop surface 601 for cooperating with the coupling limiting portion 501 and a limiting wall 602 provided at one end of the stop surface 601 close to the power head 10. The limiting wall 602 is sleeved on the outer periphery of the coupling 50 for limiting the coupling 50 in the radial direction. The limiting wall 602 and the projection of 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 away from the powerhead 10 is not easily accessible due to the inconvenience of installing the bushing 903, which may cause radial movement and generate significant vibration. This embodiment provides a limiting wall 903 to radially limit the end of the coupling 50, thereby preventing radial movement and reducing vibration.

[0163] Furthermore, the length of the limiting wall 602 in the axial direction of the transmission 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 transmission shaft 40 and the gap between the coupling 50 and the transmission shaft 40 in the axial direction of the transmission shaft 40 .

[0164] To ensure reliable assembly of the tool, a certain amount of clearance is usually left between the various components that are connected to each other. When the drive shaft 40 is forced to move toward the power head 10, to prevent the end of the coupling 50 from separating from the limiting wall 602, the limiting wall 602 cannot play a radial limiting role on the coupling 50. In this application, by setting the length of the limiting wall 602 in the axial direction of the drive shaft 40 to be greater than the sum of the clearance between the power output end of the motor and the coupling 50 in the axial direction of the drive shaft 40, and the clearance between the coupling 50 and the drive shaft 40 in the axial direction of the drive shaft 40, it can ensure that the coupling 50 will never separate from the limiting wall 602, thereby ensuring operational reliability.

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

[0166] In one embodiment, the work head 20 is configured as a high-branch saw work head, including a mounting housing 201, a sprocket rotatably supported on the mounting housing 201, a transmission assembly connected between the sprocket and the power input end of the work head, a guide plate 202 adjustably supported on the mounting housing 201, a cutting chain 203 wound around the sprocket and the outer periphery of the guide plate 202, a chain tensioning mechanism, and a guide plate adjustment mechanism. The guide plate adjustment 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 so that it is 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 work head and the transmission assembly. The sprocket drives the cutting chain 203 to reciprocate around the sprocket and the guide plate 202 to achieve the cutting purpose.

[0167] In one embodiment, corresponding transmission shaft limiters, transmission shaft stoppers, coupling limiters, and coupling stoppers are also provided between the second section 3012 of the telescopic tube section 301 and the second transmission shaft 420 at the end away from the power head 10 to prevent the second transmission shaft from escaping from the second section. The specific implementation method is the same as that of the aforementioned embodiment and will not be repeated here.

[0168] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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-pole tool includes a power head 10, a working head 20, an extension tube 30, a transmission 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 a working task; the extension tube 30 is connected between the power head 10 and the working head 20; the transmission shaft 40 is rotatably disposed in the extension tube 30 and is used to transmit 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 transmission shaft 40 and transmit torque, and the coupling 50 is arranged to move relative to the extension tube 30 in the axial direction of the transmission shaft 40. A coupling stop portion 60 is provided in the extension tube 30, and the coupling 50 includes a coupling limiting portion 501. The coupling stop portion 60 cooperates with the coupling limiting portion 501 to limit the movement of the coupling 50 relative to the extension tube 30 in the axial direction of the transmission shaft 40 away from the power head 10.

[0170] Furthermore, in one embodiment, a drive shaft stopper 80 is disposed within the extension tube 30, and a drive shaft stopper 401 is disposed on the outer periphery of the drive shaft 40. The drive shaft stopper 80 cooperates with the drive shaft stopper 401 to limit movement of the drive shaft 40 relative to the extension tube 30 in the axial direction of the drive shaft 40 away from the power head 10. The stopping of the coupling stopper 60 against the coupling stopper 501 can also prevent the drive shaft stopper 80 from failing to stop the drive shaft stopper 401.

[0171] Based on the same inventive concept, the present application also provides a high-branch saw, including a power head 10, a working head 20, an extension tube 30 and a transmission shaft 40. The power head 10 includes a housing 101 and a motor 102 arranged in 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 transmission shaft 40 is rotatably arranged in the extension tube 30, and is 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 in the extension tube 30 and is movable relative to the extension tube 30 in the axial direction of the drive shaft 40. The coupling 50 includes a coupling limiting portion 501; the coupling stop 60 is at least partially disposed in the extension tube 30, and the coupling stop 60 cooperates with the coupling limiting portion 501 to limit the movement of the coupling 50 relative to the extension tube 30 in the axial direction of the drive shaft 40 in a direction away from the power head 10.

[0172] Furthermore, the coupling 50 is arranged to move 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 limiter 401 (also referred to as a drive shaft limiter) is provided on the outer periphery of the drive shaft 40. The drive shaft stop 80 cooperates with the drive shaft limiter 401 to limit the movement of the drive shaft 40 relative to the extension tube 30 in the axial direction of the drive shaft 40 in a direction away from the power head 10. The drive shaft 40 includes an installation position for installing the drive shaft limiter 401. The installation position is configured such that when the drive shaft limiter 401 is installed in the installation position and cooperates with the drive shaft stop 80 to stop, the motor 102 can transmit torque to the drive shaft 40 through the coupling 50. The coupling stop 80 stops and limits the coupling limiter 501 to protect the drive shaft limiter 401 from moving out of the installation position.

[0173] It should be noted that the various technical features of the above long-pole tool embodiments can be applied to the high-branch saw embodiments and can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various 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 above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

[0175] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0177] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0178] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0179] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate 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 implementation methods.

Claims

1. A long-pole tool comprising: The power head comprises a housing and a motor disposed in the housing for providing driving force; a work head configured to perform a work task; an extension pipe connected between the power head and the working head; and a transmission shaft rotatably disposed in the extension tube and configured to transmit the driving force of the motor to the working head; Characterized in that, the long pole tool also includes: a coupling configured to connect the power output end of the motor and the transmission shaft and transmit torque, the coupling being at least partially disposed within the extension tube and movable relative to the extension tube in the axial direction of the transmission shaft, the coupling including a coupling stop; and The coupling stop portion is at least partially disposed in the extension tube, and the coupling stop portion cooperates with the coupling limit portion to limit the movement of the coupling relative to the extension tube in the axial direction of the transmission shaft in a direction away from the power head.

2. The long-handled tool according to claim 1, characterized in that: The coupling is arranged to move relative to the transmission shaft in the axial direction of the transmission shaft; A transmission shaft stopper is further provided in the extension tube, and a transmission shaft limiting member is provided on the outer periphery of the transmission shaft. The transmission shaft stopper cooperates with the transmission shaft limiting member to limit the movement of the transmission shaft relative to the extension tube in the axial direction of the transmission shaft in a direction away from the power head; The transmission shaft includes an installation position for installing the transmission shaft stopper, and the installation position is configured such that when the transmission shaft stopper is installed in the installation position and engages with the transmission shaft stopper to stop, the motor can transmit torque to the transmission shaft through the coupling; The coupling stop portion stops and limits the coupling limiting portion to protect the transmission shaft limiting member from leaving the installation position.

3. The long-handled tool according to claim 2, characterized in that: The coupling comprises a rear contact end surface for abutting against the transmission shaft in the axial direction of the transmission shaft, and the transmission shaft comprises a front contact end surface for abutting against the rear contact end surface; When the coupling stop portion stops the coupling limit portion and the transmission shaft limit portion is located at the installation position, the distance between the rear edge of the rear contact end surface of the coupling 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 surface of the transmission shaft and the rear edge of the transmission shaft limit portion.

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

5. The long-handled tool according to claim 2, characterized in that: When the coupling stop portion stops the coupling limit portion, in the axial direction of the transmission shaft, the gap between the rear end surface of the coupling 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 limit portion close to 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 stopper is arranged on a support member for supporting the transmission shaft; Alternatively, the coupling stopper is configured to be connected to the extension tube and protrude from the inner wall of the extension tube; Alternatively, an end stop is provided at one end of the extension tube away from the power head, and the coupling stop portion is configured to be slidably disposed in the extension tube along the axial direction of the transmission shaft and disposed between the coupling and the end stop.

7. The long-handled tool according to claim 6, characterized in that: A limiting groove is provided on the outer wall of the transmission shaft along the circumferential direction, and the transmission shaft limiting member is configured as a limiting ring which is sleeved on the outer circumference of the transmission shaft and clamped in the limiting groove, and the limiting ring is provided to protrude from the outer wall of the transmission shaft; The support member includes a bearing sleeve, which is arranged in the extension tube and is rotatable relative to the extension tube. The bearing sleeve is sleeved on the outer periphery of the transmission shaft, and is slidably plugged and synchronously rotated with the transmission shaft to allow relative movement of the transmission shaft and the bearing sleeve in the axial direction and limit relative rotation of the transmission shaft and the bearing sleeve in the circumferential direction. The coupling stop portion and the transmission shaft stop portion are both arranged on the bearing sleeve and staggered in the radial direction of the bearing sleeve.

8. The long-handled tool according to claim 1, characterized in that: The coupling member includes a coupling portion for connecting with the power output end of the motor and a coupling tube for connecting with the transmission shaft, wherein the coupling portion and the coupling tube are relatively fixedly connected; The coupling portion is provided with a connecting shaft at one end close to the power head, and the power output end of the motor is provided with a connecting shaft hole matched with the connecting shaft at one end away from the power head, and the coupling portion is connected to the power output end of the motor through the matching of the connecting shaft and the connecting shaft hole; One end of the coupling tube close to 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, and the coupling limiting part 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 at least includes a first extension section close to the power head, a second extension section telescopically connected to the first extension section, and a locking device for relative positioning and locking the first extension section and the second extension section; The transmission shaft at least includes a first transmission shaft close to the power head and a second transmission shaft telescopically sleeved to an end of the first transmission shaft away from the power head; The first transmission shaft is rotatably arranged in the first extension section, the coupling, the coupling stopper, and the transmission shaft stopper are all arranged in the first extension section, and the transmission shaft limiter is arranged on the first transmission shaft and located in the first extension section.

10. A high-branch saw comprising: The power head comprises a housing and a motor disposed in the housing for providing driving force; a working head configured to perform a cutting task; an extension pipe connected between the power head and the working head; and a transmission shaft rotatably disposed in the extension tube and configured to transmit the driving force of the motor to the working head; Characterized in that, the high branch saw also includes: a coupling configured to connect the power output end of the motor and the transmission shaft and transmit torque, the coupling being at least partially disposed within the extension tube and movable relative to the extension tube in the axial direction of the transmission shaft, the coupling including a coupling stop; and The coupling stop portion is at least partially disposed in the extension tube, and the coupling stop portion cooperates with the coupling limit portion to limit the movement of the coupling relative to the extension tube in the axial direction of the transmission shaft in a direction away from the power head.

Images