WO2021103878A1

WO2021103878A1 - Power tool and clamping device thereof

Info

Publication number: WO2021103878A1
Application number: PCT/CN2020/123504
Authority: WO
Inventors: 钱富; 鲁义刚; 张士松; 钟红风
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2019-11-26
Filing date: 2020-10-26
Publication date: 2021-06-03
Also published as: CN112847259B; CN112847259A

Abstract

A power tool (10) and a clamping device (30, 30' 30'') thereof. The clamping device is used to hold a working head (40) at the power tool such that the working head is movable around an output axis. The clamping device comprises: a clamping assembly (33, 33', 33'') capable of moving relative to an axial direction (50) to be in an expanded state or a closed state; an axial movement assembly (32, 32'), capable of moving the clamping assembly axially such that the clamping assembly is at a first axial position or a second axial position; and a locking assembly (35, 35') moving between a locking position and an unlocking position, wherein when the locking assembly is in the locking position, the clamping assembly is locked in the expanded state, and when the locking assembly is in the unlocking position, the clamping assembly can be switched to the closed state. The clamping device enables the working head to be reliably installed at and removed from the power tool.

Description

Power tool and its clamping device

This application claims the priority of the Chinese patent application whose application date is November 26, 2019 and the application number is 201911173466.0, the entire content of which is incorporated into this application by reference.

Technical field

The application relates to a power tool and its clamping device, especially a swing power tool.

Background technique

The multifunction machine is a common swing power tool in the industry. Its working principle is that the output shaft swings around its own axis. Therefore, when the user installs different working heads on the free end of the output shaft, such as straight saw blades, circular saw blades, triangular sanding discs, shovel scrapers, a variety of different operating functions can be realized, such as sawing and cutting. , Grinding, scraping, etc. to adapt to different work needs.

Chinese Published Patent Application No. CN101780668A discloses a multifunctional machine including a motor. The motor shaft of the motor is connected with an eccentric pin, and a bearing is sleeved on the eccentric pin to form an eccentric wheel structure. When the motor shaft rotates, the eccentric wheel structure can make an eccentric rotation around the axis of the motor shaft. The output shaft of the multifunction machine is arranged perpendicular to the motor shaft. A shift fork assembly is fixedly connected to the output shaft. The shift fork assembly is formed with two opposite extension arms that surround the eccentric structure. The inner side is in close contact with the bearing in the eccentric wheel structure, so when the eccentric wheel rotates eccentrically, the eccentric wheel structure will drive the shift fork to produce a horizontal swing movement, and the fixed connection between the shift fork and the output shaft makes the output shaft Swing around its axis. After installing different working heads on the free end of the output shaft, the multifunctional machine can realize a variety of operating functions under high-speed swing motion.

However, the current multi-function machine still adopts the original working head installation method, which is to loosen the fastening bolts with a wrench, and then remove the fastening elements from the output shaft: the same, in the installation and replacement of accessories, In the same way, the tightening bolts need to be loosened with the help of a wrench to replace the working head and tighten the installation. The operation is very cumbersome and time-consuming and laborious.

In contrast, technicians in the industry have also made a lot of improvements, using a quick clamping device to solve the problem of not needing to use a wrench to install and replace the working head. However, there are still many problems, such as uncomfortable operation; poor structural reliability; or inconvenient installation. Therefore, it is necessary to provide an improved power tool to solve the above-mentioned problems.

Summary of the invention

One purpose of the present application is to provide a power tool and a clamping device thereof, so that the power tool can be reliably installed and disassembled on the working head.

Another purpose of the present application is to provide a power tool and its clamping device, which can improve the comfort of the working head installation and removal operations.

In order to achieve at least one of the above objectives, this application adopts the following technical solutions:

A clamping device for a power tool. The clamping device is used to hold a working head on the power tool in a manner capable of moving around an output axis. The clamping device includes a clamping assembly that deviates from the edge. Axial action forms an expanded state and a closed state; an axially moving assembly; the axially moving assembly can move the clamping assembly in the axial direction, so that the clamping assembly has a first axial position and a second axial position Locking component; the locking component has a locking position and an unlocking position by action; when the locking component is in the locking position, the clamping component is locked in the expanded state; the locking component is in the unlocking position When the clamping assembly can be switched to the closed state; wherein there is relative movement between the locking assembly and the axial movement assembly; when the clamping assembly is located in the first axial position, the The clamping assembly is in a clamping mode capable of clamping the working head; when the clamping assembly is located at the second axial position and the locking assembly is located at the unlocking position, the clamping assembly is in a position that allows release or installation The disassembly and assembly mode of the working head.

As a preferred embodiment, the locking assembly forms the locking position and the unlocking position by moving in an axial direction.

As a preferred embodiment, from the clamping mode to the disassembly mode, the axial displacement of the locking component is greater than the axial displacement of the axial moving component.

As a preferred embodiment, the locking assembly moves from the locking position to the unlocking position when the clamping assembly is in the second axial position.

As a preferred embodiment, the clamping device further includes an operating assembly for receiving force to act; the operating assembly can rotate around an operating axis perpendicular to the output axis; the operating assembly has an operating member And a driving member; the operating member can operatively drive the driving member to cooperate with and disengage the locking assembly and the axial moving assembly.

As a preferred embodiment, the drive member is fixed on the operating member; the drive member has a first drive surface and a second drive surface surrounding the operating axis; the locking assembly is provided with The first driving surface is matched with a first mating surface; the axial movement assembly is provided with a second mating surface that is matched with the second driving surface; the first driving surface is operatively matched with the first The surfaces are in contact with and disengaged; the second driving surface is operatively in contact and disengaged with the second mating surface.

As a preferred embodiment, the operating assembly has a disengagement position corresponding to the clamping mode and an unloading position corresponding to the disassembly and assembly mode; when the operating assembly is in the disengagement position, the The driving part is not in contact with the locking component and the axial moving component, and when the operating component is in the unloading position, the driving component is kept in contact with the locking component and the axial moving component.

As a preferred embodiment, the second driving surface has at least a first part for driving the axial movement assembly, and a first part for maintaining the axial movement assembly at a position corresponding to the second axial position. Two parts; the part of the first driving surface corresponding to the same central angle as the first part is used to drive the locking assembly; the part of the first driving surface corresponding to the same central angle as the second part is also used To drive the locking assembly.

As a preferred embodiment, at least part of the second driving surface is an arc surface surrounding the operating axis; when the operating component is in the unloading position, the arc surface is kept in contact with the axial moving component.

As a preferred embodiment, the clamping device further includes: a first elastic member that applies a force to the axial movement component to move toward the position corresponding to the clamping mode, and applies a force to the locking component The second elastic element moves toward the position corresponding to the clamping mode; the second elastic element undergoes elastic deformation when the difference between the second elastic element and the first elastic element is different.

Beneficial effects:

The clamping device provided by this application does not require the operator to perform complicated operations. Only by operating the locking assembly and the axial movement assembly to switch the clamping assembly to the second axial position and the closed state, the working head can be installed and Disassembly, without disassembling the components of the clamping device itself, so that the reliability of the structure can be ensured.

With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be adopted. It should be understood that the scope of the embodiments of the present invention is not limited thereby.

Features described and/or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or substituted for features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the existence of a feature, a whole, a step or a component, but does not exclude the existence or addition of one or more other features, a whole, a step or a component.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

Fig. 1 is a schematic diagram of a power tool provided by an embodiment of the present application;

Figure 2 is a schematic cross-sectional view of Figure 1;

Fig. 3 is a schematic cross-sectional view of the clamping device of Fig. 1 in clamping mode;

Figure 4 is an exploded view of Figure 3;

Figures 5 to 8 are enlarged schematic diagrams of the parts of Figure 4;

Fig. 9 is a schematic diagram of the state of the working head of Fig. 3;

Figure 10- Figure 11 is a schematic diagram of the intermediate process of the disassembly and assembly mode in Figure 3;

Figure 12 is a schematic cross-sectional view of the clamping device of Figure 1 in disassembly mode;

FIG. 13 is a schematic diagram of the state of the working head of FIG. 12;

14 is a schematic diagram of the first driving surface and the second driving surface of the driving member of FIG. 1;

Figure 15 is a displacement curve of the locking component and the axial moving component of Figure 1;

Figure 16 is an exploded view of a clamping device provided by another embodiment of the present application;

Figures 17-20 are enlarged schematic views of the parts of Figure 16;

Figure 21 and Figure 22 are two cross-sectional views in a vertical relationship in the clamping mode of Figure 16;

Figures 23-26 are schematic diagrams of the intermediate process in the disassembly and assembly mode of Figure 16;

Figure 27 and Figure 28 are two vertical cross-sectional views of Figure 16 in disassembly mode;

Figure 29 and Figure 30 are schematic diagrams showing the state of disassembling the working head in the disassembly and assembly mode of Fig. 16;

Figures 31a-d are schematic diagrams of the working head and the two locking parts in clamping mode at different angles;

Figures 32a-d are schematic diagrams of the working head and the three locking parts in clamping mode at different angles;

Figures 33a-d are schematic diagrams of the working head and the four locking parts in clamping mode at different angles;

FIG. 34 is a schematic structural diagram of a clamping device in a clamping mode provided by another embodiment of the present application;

Figure 35 is a schematic diagram of the structure of Figure 34 in disassembly mode;

Fig. 36 is a schematic diagram of the clamping assembly of Fig. 34 in an expanded state and a closed state;

Figure 37-Figure 39 is a schematic diagram of the clamping assembly installation work head steps.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of the present invention.

It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may be another element in the middle. When an element is considered to be "connected" to another element, it can be directly connected to the other element or the other element may exist at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only, and are not meant to be the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and/or" as used herein includes any and all combinations of one or more related listed items.

Example one

Figures 1 to 13 show the power tool 10 in this embodiment. The power tool 10 has a housing 20, an output shaft 38 extending from the inside of the housing 20, a working head 40 installed at the end of the output shaft 38, and a clamping device 30 for fixing the working head 40 at the end of the output shaft 38 . The clamping device 30 is used to hold the working head 40 on the power tool 10 in a manner capable of moving around the output axis V. As shown in FIG. The clamping device 30 can make the power tool 10 clamp the working head 40 in the axial direction 50. The axial direction 50 extends substantially along the output axis V parallel to the output shaft 38.

When the power tool 10 is working, the output shaft 38 rotates and oscillates around its own output axis V, thereby generating large abrupt torques in the two directions of oscillation. Therefore, a very large axial 50 clamping force is required to ensure that the above-mentioned working head 40 can be held on the output shaft 38 under all working conditions, and there will be no slippage that affects working efficiency or fails to work. The power tool 10 provided in this embodiment can meet the above requirements, the clamping device 30 can provide sufficient clamping force, and can quickly clamp and release the working head 40 without using additional auxiliary tools.

The housing 20 is also provided with a motor, the motor has a motor shaft 201, and an eccentric transmission mechanism that converts the rotational motion output by the motor shaft 201 into the swing motion of the output shaft 38. The eccentric transmission mechanism includes an eccentric member installed on the motor shaft 201 and a shift fork 11 sleeved on the output shaft 38. The eccentric is enclosed between the two sliding surfaces of the fork 11. When the eccentric member rotates, through the cooperation with the shift fork 11, its rotational movement is converted into a swing movement of the output shaft 38 relative to its own output axis V. In this embodiment, the axis of the motor shaft 201 is substantially perpendicular to the axis of the output shaft 38. Preferably, the axis of the motor shaft 201 and the axis of the output shaft 38 are coplanar to form a central plane.

3 again, the straight line where the output axis V of the output shaft 38 is defined as the longitudinal direction, and the direction perpendicular to the output axis V is positioned transversely. When facing Figure 3, the bottom of the paper is down, and the top of the paper is up. The following description adopts the definition here. The output shaft 38 is hollow and is longitudinally supported between two rolling bearings in the housing 20. Part of the output shaft 38 is housed in the housing 20. The output shaft 38 is provided with a cavity through which it passes, and is sleeved outside some parts of the clamping device 30. The lower end of the output shaft 38 is provided with an end extending out of the housing 20 for mounting the working head 40.

In this embodiment, the working head 40 is a straight saw blade. For those skilled in the art, it is easy to imagine that the working head 40 may also be other accessories, such as circular saw blades, sand discs, scrapers, and the like. As shown in FIG. 9, the working head 40 is arranged horizontally, and has a flat mounting portion 401 for mounting on the output shaft 38 and a cutting portion for cutting. The plate mounting portion 401 is provided with a mounting through hole penetrating it, and the clamping assembly 33 can pass through the mounting through hole of the mounting portion of the working head 40, and then extend out of the cavity of the output shaft 38. The clamping assembly 33 can pass in and out of the installation through hole in the closed state, but cannot pass through the installation through hole in the expanded state.

In order to make the working head 40 and the output shaft 38 swing around the output axis V together, the clamping device 30 can fix the working head 40 axially 50 to the end of the output shaft 38. Wherein, the working head 40 may be provided with a plurality of positioning portions 403 distributed along the circumference. Specifically, the working head 40 is provided with a plurality of positioning portions 403 around the installation through hole. The positioning portion 403 may be a positioning groove or a positioning hole. As shown in FIG. 9, in this embodiment, the positioning portion 403 is a positioning hole, and a plurality of positioning holes are evenly arranged around the installation through hole in the circumferential direction. The end of the output shaft 38 has an insertion protrusion 71 inserted into the positioning portion 403. The plurality of insertion protrusions 71 are evenly distributed at the end of the output shaft 38 along the circumferential direction.

In order to facilitate the installation and disassembly of the working head 40 by the operator, the working head 40 is also provided with a notch structure 402 communicating with the installation through hole. Through the gap structure 402, the working head 40 can clamp the clamping assembly 33 into the installation through hole in the transverse direction, so that when the clamping assembly 33 is at the second axial position, the operator can realize the working head by moving the working head 40 laterally. 40's disassembly and assembly. Specifically, the notch structure 402 is located on the end side of the working head 40 away from the cutting part. The center angle corresponding to the notch structure 402 is less than 180 degrees, so as to avoid that the opening is too large to affect the normal clamping of the working head 40. Of course, in other embodiments, the work head 40 does not need to be provided with the notch structure 402, and the removal and installation of the work head can be realized by the feature that the clamping assembly 33 can pass through the installation through hole in the closed state.

In other embodiments, the mounting portion of the working head 40 may also be provided with a raised platform, and the positioning portion 403 and the mounting through hole are located on the raised platform. It can be seen that the clamping device 30 in the embodiment of the present application can be adapted to different types of working heads 40.

Continuing to refer to FIGS. 2 to 13, the clamping device 30 includes: a clamping component 33, a locking component 35, and an axial moving component 32. The clamping assembly 33 is used to fix and clamp the working head 40 to the end of the output shaft 38. The clamping assembly 33 forms an expanded state and a closed state by moving in a deviated axial direction.

In this embodiment, the clamping assembly 33 has a clamping mode and a disassembly mode. When the clamping assembly 33 is located at the first axial position, the clamping assembly 33 is in a clamping mode capable of clamping the working head 40. When the clamping assembly 33 is located at the second axial position and the locking assembly 35 is located at the unlocking position, the clamping assembly 33 is in a disassembly mode that allows the working head 40 to be released or installed.

Specifically, when the clamping assembly 33 is in the clamping mode (as shown in FIG. 3), it is in the first axial position and expanded state. At this time, the clamping assembly 33 can clamp the working head 40. When the clamping assembly 33 is in the disassembly and assembly mode (as shown in FIG. 12), it is in the second axial position and closed state (or allowed to enter the closed state). At this time, the clamping assembly 33 allows the working head 40 to be released or installed. , Correspondingly, the disassembly or installation of the working head is realized in the disassembly and assembly mode. Both the locking component 35 and the axial moving component 32 can realize the transition of the clamping component 33 from the clamping mode to the disassembling mode by moving along the axial direction 50.

Among them, the clamping assembly 33 can perform corresponding actions according to the movement of the locking assembly 35 and the axial movement assembly 32. In the expanded state, the clamping part of the clamping assembly 33 can be expanded away from the axial direction 50. In the expanded state, the working head 40 cannot be removed from the clamping assembly 33, and in the closed state, the clamping part of the clamping assembly 33 ( The locking end 93) can be retracted so that the working head 40 can be moved out of the clamping assembly 33 in the axial direction 50. When the clamping assembly 33 moves from the first axial position to the second axial position, the length of the protruding output shaft 38 increases, which facilitates the operator to place the working head 40 on the locking end 93 of the clamping assembly 33.

The clamping assembly 33 moves in a direction deviating from the axial direction 50 to form the expanded state and the closed state. Specifically, the clamping assembly 33 may have a locking surface 97 that clamps the working head 40 to the end of the output shaft 38 under the action of a tensioning force. In the closed state, the locking surface 97 can pass through the through hole of the working head 40 when the working head 40 and the clamping assembly 33 move relatively along the axial direction 50. In the expanded state, when the working head 40 and the clamping assembly 33 move along the axial direction 50, the locking surface 97 cannot pass through the through hole of the working head 40.

As shown in Figures 12 and 13, in the closed state, the maximum outer diameter of the locking end 93 where the locking surface 97 is located is smaller than the diameter of the installation through hole of the working head, and in the expanded state, the locking end 93 expands outward , The maximum outer diameter of the locking surface 97 is greater than the diameter of the through hole. In addition, in order to clamp the working head 40 reliably, the entire locking surface 97 may cover the non-through hole area of the working head 40 in the expanded state.

In this embodiment, the clamping assembly 33 includes at least two locking members 9. As shown in FIGS. 7 and 8, the locking member 9 has a locking end 93 and a mating end 98. The locking ends 93 of at least two locking members 9 are switched from the closed state to the expanded state by reverse movement. Specifically, when at least two locking members 9 are switched to the expanded state, the locking end 93 of the locking member 9 moves in the opposite direction. Correspondingly, when switching to the closed state, the locking end 93 of the locking member 9 moves toward each other . The mating end 98 cooperates with the locking component 35, and the locking component 35 is engaged with different parts of the mating end 98 by moving along the axial direction 50 to realize the reverse movement or the opposite movement of the locking end 93.

As shown in Figures 4 and 7, the clamping assembly 33 includes four

locking members

9a, 9b, 9c, and 9d. Specifically, the locking member 9 may be a hook structure. The locking member 9 has a locking end 93, and a hooking surface (a specific embodiment of the locking surface 97) is provided on the locking end 93. The locking member 9 passes through the expanded state at the first axial position, hooks the working head 40 upwards with the hooking surface, tightly clamps it on the end of the output shaft 38, and keeps moving synchronously with the output shaft 38. In addition, the locking member is also provided with an anti-rotation groove 95 on the outer wall of the intermediate portion 94 between the mating end 98 and the locking end 93.

In order to facilitate the user to install the working head 40 on the power tool 10 in any desired orientation, two or more locking members 9 are evenly distributed along the circumferential direction or mirrored symmetrically. As shown in FIGS. 29, 30, and 31a-d, the working head 40 can be fixedly mounted to the end of the output shaft 38 in different orientations, and only the insertion protrusion 71 is aligned with the positioning hole.

Of course, this application does not exclude the case where the clamping assembly 33 has only one locking member 9. At this time, the working head 40 can still be held at the end of the output shaft 38 by the hooking surface of the single locking member 9.

In this embodiment, the clamping assembly 33 can clamp and fix the working head 40 when in the first axial position and in the expanded state. The axial movement component 32 provides the clamping component 33 with an axial 50 tension force, and the locking component 35 opens the locking end 93 of the clamping component 33 so that the locking surface 97 of the hooking structure covers the plate of the working head 40 Under the body (not covered under the installation through hole), in this way, the hook structure can fix the working head 40 axially 50 to the end of the output shaft 38 under the tension provided by the axial moving assembly 32.

When the working head 40 needs to be released, the axial moving assembly 32 provides the clamping assembly 33 with an axial 50 pushing force, so that the hooking structure of the clamping assembly 33 is away from the end of the output shaft 38 in the axial direction 50, and the clamped state damage. When the clamping assembly 33 is in the expanded state, the clamping assembly 33 cannot pass through the through hole of the working head 40. To remove the working head 40, the clamping assembly 33 can be allowed or the clamping assembly 33 can be allowed or made by moving the locking assembly 35 to the unlocked state. Switch to the closed state.

The clamping device 30 provided in this embodiment does not require the operator to perform complicated operations, and only needs to switch the clamping assembly 33 to the second axial position and the closed state by operating the locking assembly 35 and the axial movement assembly 32, and the The working head 40 is installed and disassembled without disassembling the components of the clamping device 30 itself, so that the reliability of the structure can be ensured.

In this embodiment, when the output shaft 38 makes a swing motion, it will drive the working head 40 to swing together. At the same time, the output shaft 38 will also drive the locking assembly 35 and the axial moving assembly 32 to swing together. The operating component 31 is arranged outside the housing 20, which is convenient for the operator to directly operate manually without using other auxiliary tools. However, if the clamping assembly 33 swings while driving the operating assembly 31 to swing, it will affect the operator's operating feel, and even have safety issues in some conditions. Therefore, it is necessary to lock the working head 40 by the clamping device 30. Avoid driving the operating assembly 31 to swing synchronously.

In this embodiment, the operating assembly 31 has an unloading position (FIG. 12) corresponding to the above-mentioned disassembly and assembly mode and a disengagement position (FIG. 3) corresponding to the above-mentioned clamping mode, so that the operating assembly 31 can be selectively connected with The locking component 35 and the axial moving component 32 cooperate. When the working head 40 needs to be disassembled or installed, you can choose to locate the operating assembly 31 at the unloaded position, and match the locking assembly 35, the axial moving assembly 32 with the operating assembly 31, so that the clamping assembly 33 is located at the second axial position and In a closed state or in a state that allows closing, the operator disassembles, removes or installs the working head 40. When the working head 40 is required to perform swing work, the operating assembly 31 can be selected to be in the disengaged position, and the operating assembly 31 can be separated from the transmission assembly (locking assembly 35, axial movement assembly 32) at a certain distance without touching each other. The actions of the operators do not affect each other, so that the operating assembly 31 will not be affected by the swing of the clamping assembly 33.

Further, the operating assembly 31 includes an operating member 1 and a driving member 2. The operating member 1 can operate to drive the driving member 2 to move between two positions where it is engaged with and disengaged from the locking assembly 35 and the axial moving assembly 32. In this embodiment, the operating assembly 31 does not rotate around the output axis V with the output shaft 38. The operating component 31 is installed on the housing 20. Wherein, the clamping device 30 includes a mounting seat 36 fixed on the housing 20. The operating assembly 31 and the driving member 2 can be movably installed on the mounting seat 36. In order to facilitate the operator to operate and hold the operating member 1, the operating assembly 31 is installed on the top of the housing 20 to facilitate user identification and operation.

The operating component 31 has a disengagement position and an unloading position. Wherein, when the operating assembly 31 is in the disengaged position, the driving member 2 does not contact the locking assembly 35 and the axial movement assembly 32. Accordingly, the clamping assembly 33 is in the clamping mode, that is, The clamping assembly 33 is located at the first axial position and the locking assembly 35 is located at the locking position. When the operating assembly 31 is in the unloading position, the driving member 2 is kept in contact with the locking assembly 35 and the axial movement assembly 32. Accordingly, the clamping assembly 33 is in the disassembly and assembly mode, that is, the clamping assembly 33 is located at the second axial position and the locking assembly 35 is located at the unlocking position.

The operating assembly 31 can be turned around a fixed operating axis. Specifically, the operating assembly 31 is rotatably arranged on the mounting seat 36, and the drive 2 and the locking assembly 35 and the axial movement assembly can be realized by rotating the operating assembly 31. The cooperation and disengagement of 32 can realize the installation or removal of the working head 40 without complicated operations. The turning axis is perpendicular to the output axis V as a whole. The mounting seat 36 may be provided with opposite supporting ear plates. The operating assembly 31 is rotatably mounted on the supporting ear plate via a pin shaft.

The driving member 2 is fixedly arranged on the operating member 1. Of course, the driving member 2 and the operating member 1 can also be an integral structure. The operating member 1 may be a wrench, which has a grip end and a connection end. The connecting end of the operating member 1 has an embedded groove, and the driving member 2 of the cam structure is fixedly installed in the embedded groove. The pin shaft passes through the supporting lug plate, the connecting end and the driving member 2 of the mounting seat 36 together, so as to realize a relatively rotatable connection between the operating assembly 31 and the mounting seat 36. As shown in Figures 4 and 5, the driving member 2 has a limiting groove 23, and the operating member 1 is provided with a mating protrusion 101 inserted into the limiting groove 23 on the bottom wall of the embedding groove, so as to realize the synchronous rotation of the two .

The driving member 2 is fixed on the operating member 1; the driving member 2 has a first driving surface 22 and a second driving surface 21 surrounding the operating axis. The locking assembly 35 is provided with a first mating surface that cooperates with the first driving surface 22. The axial movement component 32 is provided with a second mating surface that is matched with the second driving surface 21.

The first driving surface 22 and the second driving surface 21 are operably in contact with the first mating surface and the second mating surface, respectively. The mounting seat 36 has a through hole. The first mating surface and the second mating surface of the locking component 35 and the axial moving component 32 can protrude from the through hole, and the locking component 35 and the axial moving component are realized by rotating the operating component 31. 32 can be optionally matched. As shown in Figures 4 and 5, the driving member 2 is a driving cam structure. One of the first driving surfaces 22 is located between the two second driving surfaces 21 to form a groove structure. The two

second driving surfaces

21a, 21b are respectively located on the outer contour of the driving cam, and the first driving surface 22 is located on the inner contour between the outer contours of the driving cam.

Referring to FIG. 14, in this embodiment, the second driving surface 21 has at least a first portion 2111 for driving the axial movement assembly 32, and maintains the axial movement assembly 32 to be positioned in contact with the first part 2111. The two axial positions correspond to the second part 2112 of the position. When the operating assembly rotates from the disengaged position to the unloaded position, the first part 2111 contacts the axially moving assembly 32 (the second mating surface) before the second part 2112. The second driving surface 21 contacts the axial moving component 32 through the first part 2111, and pushes the axial moving component 32 in the axial direction until the clamping component reaches the second axial position. Subsequently, the second part 2112 comes into contact with the axial moving component 32. At this time, as the operating component continues to rotate, the axial position of the axial moving component 32 does not change, and remains at the position corresponding to the second axial position. Position, correspondingly, the clamping assembly remains in the second axial position.

Referring to FIG. 14, the first driving surface 22 also includes at least two parts corresponding to the first part 2111 and the second part 2112 described above. Specifically, a portion of the first driving surface 22 corresponding to the same central angle as the first portion 2111 (hereinafter referred to as a portion 2222) is used to drive the locking assembly 35. The portion of the first driving surface 22 corresponding to the same central angle as the second portion 2112 (hereinafter referred to as the b portion 2221) is also used to drive the locking assembly 35. When the operating component rotates from the disengaged position to the unloaded position, the a part 2222 contacts the locking component 35 (the first mating surface) before the b part 2221, pushing the locking component 35 to move axially. The corresponding central angles of the a part 2222 and the first part 2111 are equal, and the distance that the a part 2222 contacts the locking component 35 and drives the locking component 35 to move is the same as the distance that the first part 2111 drives the axial moving component 32. It can be understood that there is a predetermined rotation angle range, and when the operating component rotates within the predetermined rotation angle range, the axial movement of the axial movement component 32 and the locking component 35 are synchronized. The central angles of the b part 2221 and the second part 2112 are the same. When the b part 2221 is in contact with the locking assembly 35, it will continue to drive the locking assembly 35 to move axially until it reaches the unlocked position.

It can also be seen from the displacement curve of the locking component 35 and the axial moving component 32 shown in FIG. 15 that when the first part 2111 and the a part 2222 drive the axial moving component 32 and the locking component 35 respectively, the axial moving component 32 and the locking component The component 35 moves synchronously. Specifically, the self-operating component rotates in the range of 25 degrees to 150 degrees. Correspondingly, the center angles of the first part 2111 and the a part 2222 correspond to 125 degrees. Since the operating component has rotated 150 degrees, the axial moving component 32 does not undergo axial displacement, and the position does not change at this time, that is, the second part 2112 does not push the axial moving component 32 to move. The locking assembly 35 continues to move to form an axial displacement. And it can be seen in FIG. 15 that the displacement change corresponding to the b part 2221 is faster than the displacement change corresponding to the a part 2222 until the locking assembly 35 reaches the unlocked position. It needs to be explained that the center of the central angle here is the position where the operating axis of the operating component is located.

In a specific embodiment as shown in FIG. 10 and FIG. 12, the first driving surface 22 may include a flat section 223 and a curved section 222. When the operating component 31 is in the unloading position, the flat section 223 is in contact with the locking component 35, and the flat section 223 is substantially perpendicular to the output axis V. The plane section 223 is a plane-like structure. When the operating component 31 is in the unloading position, the plane section 223 is in contact with the locking component 35 so that the operating component 31 can be maintained in the unloading position, preventing the operating component 31 from being reset as desired. Disengagement position. When the operating component 31 presses down the locking component 35 from the disengaged position until the entering plane section 223 contacts the locking component 35, the operating component 31 is in the unloading position, and correspondingly, the locking component 35 is in the unlocking position.

When the curved surface section 222 is in contact with the first mating surface, the curved surface section 222 pushes the locking component 35 downward while the operating component 31 rotates to the unloading position. In addition, the inner contour of the driving member 2 also has a plane structure 221, and the curved surface section 222 is located between the plane structure 221 and the plane section 223. When the operating component 31 is in the disengaged position, the planar structure 221 is located above the first mating surface, and the two do not touch each other.

In order to realize that the locking assembly 35 can still move after the axial moving assembly 32 enters the target axial position corresponding to the second axial position, at least part of the second driving surface 21 is an arc surface surrounding the operating axis. When the operating component 31 is located at the unloading position, the arc surface maintains contact with the axial moving component 32. When the arc surface is in contact with the locking assembly 35, the rotation of the operating assembly 31 will not cause the axial movement of the axial movement assembly 32 to move.

In other embodiments, the positions of the first driving surface 22 and the first driving surface 22 can be switched with each other. Accordingly, the locking assembly 35 and the axial movement assembly 32 can be changed accordingly, and this application does not make a unique limitation.

In this embodiment, the locking component 35 has a locking position (for example: FIG. 3) and an unlocking position (for example: FIG. 12) through actions. When the locking assembly 35 is in the locking position, the clamping assembly 33 is locked in the expanded state. When the locking assembly 35 is in the unlocking position, at least the clamping assembly 33 is allowed to switch to the closed state. When the locking assembly 35 is in the locked position, the clamping assembly 33 is restricted in the expanded state, thereby reliably restricting the clamping of the working head 40.

When the locking assembly 35 is in the unlocked position, at least the clamping assembly 33 is allowed to switch to the closed state; at this time, the clamping assembly 33 can be switched to the closed state by manual operation (as shown in Figs. 27-30), It is also possible to move the clamping assembly 33 into the closed state by moving the clamping assembly 33 in a direction deviating from the axial direction 50 while the locking assembly 35 is moved to the unlocked position.

In this embodiment, when the locking assembly 35 is in the unlocked position, the clamping assembly 33 is also in the closed state, so there is no need for the operator to manually close the clamping assembly 33, just remove the working head 40 (the working head 40 can also be dropped by itself) Drop) or just install the working head 40. When the working head 40 is installed, the working head 40 is manually held until the clamping assembly 33 locks and fixes the working head 40 to prevent the working head 40 from falling when the operating assembly 31 is rotated.

In other embodiments, when the locking assembly 35 is in the unlocked position (Figure 27), the operator can manually close the clamping assembly 33 and then install the working head 40. At this time, the clamping assembly 33 can be released to make the working head 40 Hang on the clamping assembly 33, and then rotate the operating assembly 31 to clamp the working head 40.

It should be noted that the locking assembly 35 can be moved in the housing 20, and can be switched between the locked position and the unlocked position by the movement. The action form can be rotation, translation, swing, etc., which is not uniquely limited in this application. In this embodiment, the locking assembly 35 moves along the axial direction 50 to engage with different parts of the clamping assembly 33 to form different states of the clamping assembly 33.

In this embodiment, the axial moving assembly 32 can move the clamping assembly 33 along the axial direction 50 so that the clamping assembly 33 has a first axial position and a second axial position. The axial moving assembly 32 and the clamping assembly 33 can move together along the axial direction 50, and the axial moving assembly 32 pushes and pulls the clamping assembly 33 to realize the switching between the first axial position and the second axial position of the clamping assembly 33.

Wherein, the first axial position corresponds to the clamping mode, and the second axial position corresponds to the disassembly mode. That is, when the clamping assembly 33 is at the first axial position and the locking assembly 35 is at the locking position, the clamping assembly 33 can clamp the working head (the clamping assembly 33 is in the clamping mode ); When the clamping assembly 33 is located in the second axial position and the locking assembly 35 is located in the unlocking position, the clamping assembly 33 can release or install the working head 40 (the clamping assembly 33 is located in the disassembly and assembly mode).

In this embodiment, the locking assembly 35 and the axial movement assembly 32 transfer the action of the operating assembly 31 to the clamping assembly 33, so that the clamping assembly 33 moves in the axial direction and in the expanded state and The switching between the closed states in turn causes the clamping assembly 33 to switch between the clamping mode and the disassembling mode. The locking component 35 and the axial moving component 32 are pivotally arranged on the power tool 10 around an output axis V parallel to the axial direction 50 and sleeved in the output shaft 38.

In this embodiment, there is relative movement between the locking component 35 and the axial moving component 32, and at least part of the movement between the two is asynchronous movement. During the rotation of the operating assembly 31, the locking assembly 35 and the axial movement assembly 32 can start to move at the same time, but they do not end at the same time or start to move at the same time. For example, during the rotation of the operating component 31 from the disengaged position to the unloaded position, the locking component 35 ends its displacement later than the axial moving component 32.

Specifically, from the clamping mode to the disassembly mode, the axial displacement of the locking assembly is greater than the axial displacement of the axial moving assembly. Wherein, the locking component 35 moves from the locking position to the unlocking position when the clamping component 33 is basically at the second axial position. Of course, during the rotation of the operating assembly 31, the axial moving assembly 32 pushes the clamping assembly 33 to the second axial position. At this time, the operating assembly 31 continues to rotate and pushes the locking assembly 35 to continue to move along the axial direction 50. The moving component 32 may allow slight displacement or no displacement at this time.

Of course, in other embodiments, the locking component 35 and the axial moving component 32 can also move synchronously, for example, synchronously. At this time, the locking component 35 and the axial moving component 32 move along the axial direction 50 at the same time and stop moving at the same time.

It should be noted that the locking component 35 forms a locked position and an unlocked position through axial displacement. It is understandable that only the locking component 35 can lock the clamping component 33 in the expanded state position, and the locking component 35 can be regarded as being in the locked position. Position; correspondingly, the locking component 35 can allow the clamping component 33 to switch to the closed position, which can be regarded as the locking component 35 in the unlocked position.

Based on this understanding, in this embodiment, considering that the relative positions of the locking assembly 35 and the clamping assembly 33 have not changed during a part of the movement, a certain axial displacement is generated together, and then relative to the housing 20 of the entire power tool 10 In other words, the locking position of the locking component 35 corresponds to a length of axial displacement. During the axial displacement of this length, the locking component 35 locks the clamping component 33 in the expanded state, so that the locking component 35 is always in the locked position. Correspondingly, the unlocking position may correspond to the axial position of the locking assembly 35 in the disassembly and assembly mode, that is, the axially lowest position of the locking assembly 35.

Please continue to refer to Figure 3 to Figure 12. The locking assembly 35 includes a core rod 10 and a ferrule 8 matched with the clamping assembly 33. The ferrule 8 is fixedly connected to one end of the core rod 10 close to the clamping assembly 33. The axial movement assembly 32 includes a clamping shaft 14 sleeved outside the core rod 10. An end of the clamping shaft 14 close to the clamping assembly 33 is provided with a driving portion 142 that cooperates with the clamping assembly 33.

In this embodiment, the upper end 101 of the core rod 10 protrudes from the output shaft 38 and the positioning seat 36, and the upper end surface of the core rod 10 forms a first mating surface that is matched with the first driving surface 22 of the driving member 2. The upper end of the clamping shaft 14 protrudes from the output shaft 38 and the positioning seat, and the upper end surface of the clamping shaft 14 can form a second mating surface that is matched with the driving member 2. In order to facilitate the cooperation of the core rod 10 with the driving member 2, the separation distance between the two second driving surfaces 21 in the direction of the operating axis (ie, the width of the first driving surface 22 in the direction of the operating axis) is greater than the diameter of the core rod 10. Further, the protrusion height of the core rod 10 may be greater than the protrusion height of the clamping shaft 14. After the clamping shaft 14 carries the core rod 10 and moves down for a certain distance, the driving member 2 pushes the core rod 10 to continue to move down.

In this embodiment, the clamping device 30 further includes a second elastic member 13 that applies a force to the locking assembly 35 to move toward the position corresponding to the clamping mode, and applies a force to the axial movement assembly 32 The first elastic member 5 moves toward the position corresponding to the clamping mode. In the case of removing the restriction of the operating component 31 (that is, the operating component 31 is in the disengaged position), relying on the second elastic member 13 and the first elastic member 5 enables the clamping device 30 to return to the clamping mode by itself and remain in the clamping mode. Tight mode. What is important is that the first elastic member 5 can also provide an axial tensioning force to the clamping assembly 33, so that the clamping assembly 33 can be reliably maintained in the clamping mode and not easily damaged, thereby ensuring that the power tool 10 can work reliably.

In this embodiment, the second elastic member 13 and the first elastic member 5 undergo elastic deformation when they differ. The deformation periods of the second elastic member 13 and the first elastic member 5 are staggered. Specifically, when the first elastic member 5 is deformed, the locking assembly 35 and the axial movement assembly 32 move together, and when the second elastic member 13 is deformed, only the locking assembly 35 moves in the axial direction 50.

Wherein, the second elastic member 13 is attached to the axial moving component 32 to apply elastic force to the locking component 35. The clamping shaft 14 of the axial movement assembly 32 has a supporting portion for supporting the second elastic member 13. One end of the second elastic member 13 is supported by the support portion, and the other end applies elastic force to the core rod 10. In this embodiment, the clamping shaft 14 is provided with a first spring that abuts the core rod 10. The lower end of the clamping shaft 14 is a blocking end and forms a support portion for the first spring.

The first elastic member 5 may include a second spring sleeved outside the clamping shaft 14. In order to install the second spring, a force-receiving step is fixed on the outside of the clamping shaft 14, and an abutting step is provided inside the output shaft 38. A second spring is provided between the stressed step and the abutting step. Specifically, the outer fixing sleeve of the clamping shaft 14 is provided with a positioning sleeve 4. The upper end surface of the positioning sleeve 4 may also form a second mating surface, and the lower end of the positioning sleeve 4 has a disc structure forming a force-bearing step. A gasket 6 is fixed in the output shaft 38, and the gasket 6 provides an abutting step. One end of the second spring 5 abuts against the washer 6 and the other end abuts against the positioning 4 to provide upward elastic force for the clamping shaft 14.

To facilitate the installation of the gasket 6, the output shaft 38 includes an upper sleeve 3 and a lower sleeve 7. The insertion protrusion 71 is located at the end of the lower sleeve 7. The shift fork 11 is fixedly sleeved outside the upper shaft sleeve 3. The upper end 72 of the lower sleeve 7 is fixedly connected between the lower end of the upper sleeve 3 and the lower end of the shift fork 11. The gasket 6 divides the interior of the output shaft 38 into two upper and lower cavities. The first elastic member 5 is located in the cavity above the gasket 6, and the second elastic member 13 and the ferrule 8 are located in the cavity below the gasket 6. .

In this embodiment, the driving portion 142 includes a circular protrusion 1421 disposed at the end of the clamping shaft 14. The clamping shaft 14 includes a central rod 141 and an annular protrusion 1421 fixed to the lower end of the central rod 141. The inner side of the locking member 9 has an embedded groove 92. At least two locking members 9 are evenly arranged around the annular protrusion 1421. The annular protrusion 1421 is embedded in the embedding groove 92. A plurality of embedding grooves 92 form an annular groove along the circumferential direction, and the annular protrusion 1421 is located in the annular groove. The annular protrusion 1421 is inserted into the insertion groove 92 of the clamping assembly 33, so that the driving portion 142 can push or pull the clamping assembly 33.

In order to connect the ferrule 8 and the core rod 10 and make the core rod 10 and the ferrule 8 move synchronously, the wall of the clamping shaft 14 is provided with a long sliding hole 143 extending in the same direction. The clamping sleeve 8 is sleeved outside the clamping shaft 14. The core rod 10 is connected to the ferrule 8 through the pin 12 through the long sliding hole 143. The core rod 10 is provided with a connecting through hole 102 for the pin 12 to pass through. The clamping sleeve 8 is integrally sleeved above the driving portion 142 of the clamping shaft 14. The upper end 81 of the clamping sleeve 8 fits and sleeves outside the clamping shaft 14 and fits with the inner wall of the clamping shaft 14 so that the clamping shaft 14 can guide the movement of the clamping sleeve 8. In addition, both ends of the pin 12 penetrate into the connecting holes 83 provided at the upper end 81 of the ferrule 8 respectively.

The ferrule 8 has a main body 82 below the upper end 81 thereof. The clamping sleeve 8 is provided with an inner limiting platform 84 and an embedding groove 85 located on a side of the inner limiting platform 84 away from the locking end 93. The inner limit stand 84 and the insertion groove 85 are located on the main body 82. The mating end 98 of the locking member 9 is provided with a circumferential boss 96 and a slot 91 located on the side of the circumferential boss 96 close to the locking end 93. When the clamping sleeve 8 is in the locked position, the circumferential boss 96 is folded into the inner limit platform 84. When the clamping sleeve 8 is in the unlocking position, the circumferential boss 96 is locked into the embedding groove 85, and the inner limiting platform 84 is locked into the locking groove 91.

As shown in FIG. 8, the insertion groove 85 of the clamping sleeve 8 is located above the circumferential boss 96, and the clamping groove 91 of the locking member 9 is located below the circumferential boss 96. When the ferrule 8 is in the locked position, the circumferential boss 96 and the inner limiter 84 are located at the same axial position, and are constrained in the radial direction by the inner limiter 84, and the locking member 9 drives the portion 142 (circular convex The shaft forms a lever structure, which turns over and causes the locking end 93 to move in the opposite direction and open.

When the inner limit table 84 of the clamping sleeve 8 is locked into the groove 91, the radial limit of the mating end 98 of the locking member 9 is lost. At this time, the operator is allowed to manually close the locking end 93 of the clamping assembly 33 . In order to reduce the operation of the operator, a step 981 is provided on the side of the slot 91 close to the locking end 93. The inner limit table 84 abuts against the abutment step 981 so that the clamping assembly 33 is in the closed state. When the lower surface of the inner limit table 84 contacts the abutting step 981, the locking member 9 can be turned over with the driving portion 142 (circular protrusion) as the axis, and the plurality of locking ends 93 move toward each other to close, so that the clamping sleeve 8 When in the unlocked position, the clamping assembly 33 is automatically switched to the closed state, and the working head 40 can fall off by itself or be manually moved out along the axial direction 50 for disassembly and installation.

In the clamping mode, the clamping sleeve 8 restricts the locking end 93 of the locking member 9 in an open and expanded state. In addition, the locking member 9 is pulled to the first axial position by the clamping shaft 14, the clamping shaft 14 and the elastic force exerted by the second spring through the positioning sleeve 4 tighten the locking member 9 in the axial direction 50, As a result, the locking member 9 axially 50 clamps the saw blade at the end of the output shaft 38, the insertion protrusion 71 at the end of the output shaft 38 is inserted into the positioning portion 403 on the saw blade plate, and the output shaft 38 can drive the saw blade. Swing around the output axis V. At this time, the wrench as the operating member 1 is in the disengaged position, and the driving cam as the driving member 2 is not in contact with the clamping shaft 14 and the core rod 10.

When you need to remove the saw blade, pull the wrench. 5 and 10, the second driving surface 21 of the outer contour of the driving cam is in contact with the mating surface of the clamping shaft 14 and/or the upper end surface of the positioning sleeve 4, and the driving surface of the inner contour is in contact with the core rod 10 The mating surfaces of the upper end surfaces are in contact. When facing FIG. 10, the wrench rotates in a counterclockwise direction (O direction) and moves away from the housing 20.

Continue to pull the wrench to overcome the elastic force of the second spring under the action of the second driving surface, so that the positioning sleeve 4 and the clamping shaft 14 move down, and the first driving surface acts on the core rod 10, so that the core rod 10 and the clamp The tightening shaft 14 moves down synchronously. When the clamping shaft 14 moves down, the plurality of locking members 9 are pushed down by the annular protrusion at the lower end. The core rod 10 is connected with the ferrule 8 through the pin 12. When the core rod 10 moves down, the ferrule 8 is driven to move down synchronously. During the movement, the locking assembly 35 and the axial moving assembly 32 are relatively stationary, and the jaws are still in the expanded state. .

Continue to pull the wrench, as shown in Figure 11, the second spring remains compressed, the first driving surface starts to compress the core rod 10 as it rotates, and the core rod 10 moves downward to compress the first spring. Because the clamping shaft 14 has a sliding length In the hole 143, the pin 12 passes through the long sliding hole 143 to fix the core rod 10 inside and outside of the clamping shaft 14 and the clamping sleeve 8 to be fixedly connected. Under the action of the pin 12, the core rod 10 drives the clamping sleeve 8 to move downward along the long sliding hole 143. When the lower end of the ferrule 8 is moved to the slot 91 of the mating end 98 of the locking member 9, the locking member 9 will be driven to close and enter the closed state as shown in FIG. 12. At this point, the old saw blade can be disassembled. When installing a new saw blade, move the wrench clockwise (direction C) toward the rear housing 20.

In this embodiment, in order to prevent the locking member 9 from being switched to the closed state, as shown in FIG. 12, the working head 40 (saw blade) falls by itself under the action of gravity, and the end of the lower sleeve 7 is provided with a magnetic adsorption device . The working head 40 is magnetically held at the end of the lower sleeve 7 by a magnetic adsorption device, and then it can be manually removed. Of course, the embodiments of the present application are not limited in this manner. For example, the following second and third embodiments both provide solutions to prevent the working head 40 from falling.

In this embodiment, the first driving surface may not be in contact with the core rod 10 first, and the second driving surface 21 may first contact the mating surface with the first driving surface 22. In this case, the elastic force of the second spring is first overcome under the action of the second driving surface 21, so that the positioning sleeve 4 and the clamping shaft 14 move downward. The clamping shaft 14 supports the core rod 10 and the ferrule 8 through the internal first spring. During the downward movement of the clamping shaft 14, the core rod 10 and the ferrule 8 will move synchronously. The relative position between 8 and the locking member 9 does not change, and the locking member 9 is still in an expanded state. After that, the second spring keeps the compressed state basically unchanged, and the first driving surface 22 starts to contact the mating surface of the core rod 10, pushing the core rod 10 to compress the first spring, and the locking member 9 is switched to the closed state to realize the saw blade Disassembly and assembly.

In the clamping device 30 of this embodiment, the locking members 9 are arranged in a circumferential direction, so that the number of the locking members 9 can also be allowed to be three, four or more. In addition, the work head 40 can be allowed to be mounted on the power tool 10 at various angles, and the work head 40 can be clamped, so as to adapt to different application scenarios. As shown in Figure 31a-d, when the number of the locking member 9 is two, the locking member 9 and the working head 40 are matched with different matching positions, and only the positioning hole is matched with the insertion protrusion 71 Just insert it. As shown in Figure 32a-d, when the number of locking members 9 is three, the locking member 9 and the working head 40 are matched with different matching positions, and only the positioning hole is matched with the insertion protrusion 71 Just insert it. As shown in Figure 33a-d, when the number of locking members 9 is four, the locking member 9 and the working head 40 can be matched with different matching positions, and only the positioning hole needs to be matched with the insertion protrusion 71 Just insert it.

Example two

Please refer to Figure 16 to Figure 30. The second embodiment of the present application provides a power tool 10, which is the same as the power tool 10 in the first embodiment, and includes a housing 20, an output shaft 38 extending from the inside of the housing 20, and installed at the end of the output shaft 38 A working head 40, a clamping device 30' for fixing the working head 40 at the end of the output shaft 38. The clamping device 30' is used to hold the working head 40 on the power tool 10 in a movable manner around the output axis V. The clamping device 30' can clamp the working head 40 in the axial direction 50 of the power tool 10. The axial direction 50 extends substantially along the output axis V parallel to the output shaft 38. Among them, the specific structure and principle of the clamping device 30' are basically the same as the first embodiment, and the following description mainly focuses on the different structure from the first embodiment.

In this embodiment, the locking member 9'is rotated to switch between the expanded state (Figure 21, Figure 22) and the closed state (Figure 29, Figure 30). Specifically, the clamping assembly 33' has a clamping shaft 12' perpendicular to the output axis V (the clamping shaft 12' has an axis H perpendicular to the output axis V). The two locking members 9'are rotatably sleeved outside the clamping shaft 12'. The clamping shaft 12' is connected with the driving part. As shown in FIG. 18, the driving part includes two opposite connecting plates 1422. The side of the ferrule 8'is provided with a receiving groove 86 for receiving the connecting plate 1422. The connecting plate 1422 passes through the receiving groove 86 to connect to the clamping shaft 12'.

The second elastic member 13 includes a third spring sleeved on the core rod 10'. As shown in Figures 17 and 18, the rod body of the core rod 10' has a diameter-reducing step 104, and the clamping shaft 14' has a support step 144 above the connecting plate 1422. The support step 144 forms a support for the second elastic member 13 Support part. The third spring is clamped between the supporting step 144 and the diameter-reducing step 104 to abut and support the core rod 10'.

Compared with the connection between the core rod 10 and the pin 12 of the ferrule 8 in the previous embodiment, the lower end of the core rod 10' in this embodiment is directly fixed to the upper end of the ferrule 8'. The core rod 10' and the ferrule 8'are movable in the axial direction 50 relative to the clamping shaft 14'. The two connecting plates 1422 of the clamping shaft 14' are distributed across the two sides of the clamping assembly 33'.

In this embodiment, as shown in Fig. 19, the clamping device 30' is further provided with a holder 16 for moving the clamping assembly 33' toward the expanded state. Specifically, the retaining member 16 includes a torsion spring sleeved between the two locking members 9'. The torsion spring is coaxially arranged with the clamping shaft 12' and has two connecting ends. One of the connecting ends acts on one locking element 9', and the other connecting end acts on the other locking element 9'. Through the retaining member 16, the clamping assembly 33' can be maintained in an expanded state. When the ferrule 8'enters the unlocked position, it is still maintained in the expanded state and allowed to switch to the closed state. At this time, the working head 40 will not fall off by itself, and it is necessary to manually close the clamping assembly or press down the working head 40 to close the clamping assembly. Correspondingly, there is no need to keep the working head 40 when the working head 40 is installed, as long as the working head 40 is installed. Being held by the locking end 93', the user only needs to rotate the operating assembly 31 to the disengaged position.

As shown in Figures 16 and 20, the clamping device 30' also includes a dust cover 15 sheathed outside the clamping assembly 33'. Both ends of the clamping shaft 12' are inserted into the wall of the dust cover 15 respectively. The dust cover 15 has a receiving groove 151 opposite to each other. The connecting plate 1422 is inserted into the accommodating groove 151 and is passed through by the clamping shaft 12'. The connecting plate 1422 is provided with a connecting hole 143' through which the clamping shaft 12' passes. The dust cover 15 and the clamping assembly 33' move along the axial direction 50 together. The dust cover 15 is slidably sleeved in the output shaft 38, which can prevent debris from entering the clamping device 30', ensure smooth movement between the components of the clamping device 30', and ensure the user's experience.

In this embodiment, the clamping assembly 33' has two locking members 9'. The locking member 9'has an intermediate connecting portion between the mating end 98' and the locking end 93', and the intermediate connecting portion has a shaft hole through which the clamping shaft 12' passes. The middle connecting part has a circular ring structure as a whole, and an arc-shaped fitting part 99 is provided on the lower side. The middle connecting parts of the two locking parts 9'are relatively fit, and the torsion spring is sleeved outside the middle connecting part. The arc-shaped fitting portion 99 is fitted to the bottom wall 152 of the dust cover 15, so that the locking member 9'rotates smoothly.

In the clamping mode, the clamping sleeve 8'and the locking end 93' of the torsion spring restricting locking member 9'are in an expanded state. In addition, the locking member 9'is pulled to the first axial position by the clamping shaft 14', the shaft 14' is clamped and the second spring passes through the elastic force exerted by the positioning sleeve 4'to pivot the locking member 9' Tighten toward 50, so that the locking member 9'axially 50 clamps the saw blade on the end of the output shaft 38. The saw blade as a whole is in a tightened state.

The insertion protrusion 71 at the end of the output shaft 38 is inserted into the positioning portion 403 on the saw blade plate, and the output shaft 38 can drive the saw blade to swing around the output axis V. At this time, the wrench as the operating member 1 is in the disengaged position, and the driving cam as the driving member 2 does not contact the clamping shaft 14' and the core rod 10'.

When you need to remove the saw blade, pull the wrench. As shown in Figures 21 to 23, the second driving surface 21 of the outer contour of the driving cam is in contact with the second mating surface of the upper end surface of the clamping shaft 14' and/or the positioning sleeve 4', and is located on the first driving surface of the inner contour. The surface 22 is in contact with the first mating surface of the upper end surface of the core rod 10'. When facing FIG. 21, the wrench rotates in the counterclockwise direction (O direction) and moves away from the housing 20.

Continue to pull the wrench to overcome the elastic force of the second spring under the action of the second driving surface 21, so that the positioning sleeve 4'and the clamping shaft 14' move down, and the first driving surface 22 acts on the core rod 10' so that The core rod 10' and the clamping shaft 14' move down synchronously. When the clamping shaft 14' moves downward, the two locking members 9'and the dust cover 15 are pushed together by the clamping shaft 12' at the lower end to move downward. The core rod 10' and the ferrule 8'are fixedly connected, and when the core rod 10' moves downward, the ferrule 8'is moved down synchronously. The clamping sleeve 8'and the core rod 10' move down along with the clamping shaft 14'. During this process, the locking assembly 35' and the axial moving assembly 32' are relatively stationary, and the claws are still in an expanded state.

Continue to pull the wrench, as shown in Figure 25 and Figure 26, the second spring remains compressed, the first driving surface 22 starts to compress the core rod 10' as it rotates, and the core rod 10' moves downward to compress the first spring, and the core rod 10 'Drive the card sleeve 8'to move down along the long sliding hole. During this process, the locking assembly 35' moves downward relative to the axial movement assembly 32', and the axial movement assembly 32' is stationary as a whole. As shown in Figure 27 and Figure 28, when the inner limit platform 84' at the lower end of the ferrule 8'moves to the groove 91' of the mating end 98' of the locking member 9', the locking member 9'will lose The locked state allows the locking member 9'to be switched to the closed state; correspondingly, the locking end 98' also moves to be radially aligned with the groove 85'. At this time, as shown in Figure 29 and Figure 30, you can directly pull the saw blade to overcome the force of the torsion spring to complete the removal of the old saw blade.

When installing a new saw blade, by pressing down the saw blade, the jaws overcome the force of the torsion spring and rotate around the clamping shaft 12' to close, and then move the wrench clockwise (direction C) toward the rear housing 20.

Example three

Please refer to Figures 34 to 39, a clamping device 30" of a power tool in another embodiment of the present application. The clamping device 30" is used to hold the working head 40 in a movable manner around the output axis. Said on the power tool. Using the power tool of the clamping device 30" can facilitate the operator when disassembling and assembling the working head, the working head 40 will not fall by itself and cause damage to the working head, and the working head 40 does not need to be kept at all times when the working head 40 is installed.

Similar to the power tool in the second embodiment, the power tool in this embodiment may also include a housing, an output shaft extending from the inside of the housing, a working head 40 installed at the end of the output shaft, and a working head 40, a clamping device 30" fixed at the end of the output shaft. The output shaft has an upper sleeve 3 and a lower sleeve 7. The shift fork 11 is sleeved on the output shaft 38. The clamping device 30" is used to hold the working head 40 It is held on the power tool in a manner movable around the output axis V. The clamping device 30" can clamp the working head 40 in the axial direction 50. The axial direction 50 extends substantially along the output axis V parallel to the output shaft.

Among them, part of the structure of the clamping device 30" of this embodiment is the same as that of the second embodiment. The following description mainly focuses on the different structures from the second embodiment. However, it is understandable that the various embodiments of this application can refer to each other. Reference.

In this embodiment, the clamping device 30" includes: a clamping assembly 33", which forms an expanded state and a closed state by moving along the deviated axial direction. Wherein, when the clamping assembly 33" is in the clamping mode (as shown in Figure 34), the clamping assembly 33" is restricted to the expanded state; the clamping assembly 33" is in the disassembly and assembly mode (such as 35), the clamping assembly 33" is in the expanded state and allowed to enter the closed state from the expanded state.

The clamping device 30" provided in this embodiment is provided with a clamping assembly 33". When the clamping assembly 33" is in the disassembly mode, it is still in the expanded state and allowed to enter the closed state from the expanded state Therefore, when the power tool enters the disassembly and assembly mode, the working head 40 will not fall by itself to damage the working head 40 or cause safety problems. There is no need to maintain the working head 40, which is convenient for the operator to operate. Of course, in the second embodiment Clamping devices can also produce this effect.

In this embodiment, the clamping assembly 33" includes two locking members 9". The clamping device 30" is also provided with a holding member; the holding member applies a force that acts toward the expanded state to the clamping assembly 33". The clamping assembly 33" has a locking end 93" for clamping the working head 40 and a mating end 98" for mating with the locking assembly.

The structure of the locking member 9" and the holding member of the clamping assembly 33" can refer to the structure of the clamping assembly 33, the holding member 16 and the like in the second embodiment, and the similarities will not be repeated in this embodiment.

In this embodiment, the clamping assembly 33" can rotate around a clamping axis 121' perpendicular to the output axis V. The locking end 93" and the mating end 98" are located on the clamping axis 121' on both sides. Correspondingly, the two locking pieces 9" are arranged concentrically with the clamping shaft 12". The clamping axis 121' can be the central axis of the clamping shaft 12". This application does not limit whether the clamping shaft is Rotate around the clamping axis 121'.

In this embodiment, the clamping device 30" also includes: an axial moving assembly; the axial moving assembly can move the clamping assembly 33" in the axial direction so that the clamping assembly 33" has a first The axial position and the second axial position. When the clamping assembly 33" is in the clamping mode, the clamping assembly 33" is in the first axial position. When the clamping assembly 33" is in the disassembly mode, The clamping assembly 33" is in the second axial position.

In this embodiment, the axial movement assembly includes a clamping shaft 14" and a positioning sleeve 4" sleeved on the outside of the clamping shaft 14". The positioning sleeve 4" and the clamping shaft 14" are relatively fixedly arranged. The clamp. The lower end of the tightening shaft 14" forms a connecting plate such as that in the second embodiment, and the connecting plate is provided with a connecting hole for the clamping shaft 12" to pass through. When the axial moving component is forced to move in the axial direction, the clamping shaft The connecting plate of the rod 14" can drive the clamping assembly 33" to move axially.

In this embodiment, the clamping device 30" also includes: a first elastic member 5" that applies a force to the axial movement component to move toward a position corresponding to the first axial position. The first elastic member 5" is located in the output shaft, and can be a cylindrical spring sleeved outside the clamping shaft 14". An abutting step is provided in the output shaft, and the first elastic member 5" is sandwiched between the abutting step and the positioning sleeve 4" in the axial direction, and pushes the positioning sleeve 4" upwards.

In this embodiment, the clamping device 30" also includes an operating component for receiving force to perform an action; the operating component can rotate around an operating axis perpendicular to the output axis V. The operating component has an operating member 1" and driving member 2"; the operating member 1" can operatively drive the driving member 2" to cooperate with and disengage from the axial moving assembly.

The operating components can refer to the corresponding description of operating component 31 in the second embodiment. The difference is that the structure of the driving component 2" in this embodiment is simpler than that of the driving component 2 in the second embodiment. There is no need to provide the first driving surface 22, only the second driving surface 21 for pushing the axially moving component is provided, and the rest will not be described in detail.

The clamping device 30" also includes a locking assembly. The locking assembly has a locking position and an unlocking position relative to the clamping assembly 33". When the locking assembly is in the locked position, the clamping assembly 33" is locked in the expanded state; when the locking assembly is in the unlocking position, the clamping assembly 33" is allowed to switch to the Closed state.

The locking component can be fixed in position in the housing or the output shaft, or it can act independently to form a locked position and an unlocked position relative to the clamping component 33".

For example, in the second embodiment shown in FIGS. 16 to 30, the locking assembly moves from the locked position to the unlocked position when the clamping assembly 33" is in the second axial position. In the second embodiment, when the clamping assembly 33" moves from the first axial position to the second axial position, the locking assembly and the clamping assembly 33" move together; when the clamping assembly 33" moves to the second axial position After the position is maintained in this position, the locking assembly moves separately to change the relative position between the clamping assembly 33" and the locking assembly.

Looking at this embodiment again, the locking assembly includes a ferrule 8″, which is fixedly arranged along the axial direction 50 of the output shaft. The upper end of the ferrule 8″ is relatively slidably sleeved on the clamping shaft 14″ (axial moving assembly). ), and provide the abutting portion (abutting the step) of the first elastic member 5". The ferrule 8" is provided with an inner limit platform 84" which is matched with the mating end 98" of the clamping assembly 33".

When the clamping assembly 33" is at the first axial position, the locking assembly is located at the locking position relative to the clamping assembly 33". When the clamping assembly 33" is located at the second axial position, the locking assembly is located at the unlocking position relative to the clamping assembly 33". Specifically, the locking assembly is provided with an inner limiter 84". The inner limiter 84" can be matched with the mating end 98" to condense the mating ends 98" of the plurality of locking pieces 9", and then The clamping assembly 33" is kept in an expanded state. When the clamping assembly 33" is in the clamping mode, the mating end 98" and the inner limit platform 84" are in the same axial position; when the clamping assembly 33" is in the disassembly mode , The mating end 98" and the inner limit platform 84" are located at different axial positions.

In this embodiment, when the clamping assembly 33" is located at the second axial position, as shown in Figure 35, the mating end 98" moves down and is staggered with the inner limit table 84" and loses the limit of the inner limit table 84". However, due to the existence of the reset elastic member, the clamping assembly 33" still remains in the expanded state. Correspondingly, rotate the operating member 1 in the C direction to move the clamping assembly 33" upwards, and the mating end 98" can be directly Move up to the axial position corresponding to the inner limit table 84". The inner limit table 84" can prevent the mating end 98" from rotating around the clamping shaft 12" when it is radially aligned with the mating end 98", thereby preventing the clamping assembly 33" from changing to a closed state under the action of external force when in this position , To ensure that the working head 40 is reliably clamped, and to ensure the smooth progress of the desired operation.

It should be noted that although the upper side of the inner limit table 84" (the side away from the clamping shaft 12") is provided with an embedding groove in this embodiment, and the lower side of the mating end 98" is provided with a card slot. However, this In the embodiment, the lower side of the mating end 98" (the side close to the clamping shaft 12") does not need to be provided with a card slot. Correspondingly, the inner side of the inner limit table 84" also does not need to be provided with an inserting groove 85", so this is not the case. As a limitation, the structure of the ferrule 8" and the clamping assembly 33" in this embodiment can be simpler and easier to manufacture.

It can be seen that the clamping device 30" provided in this embodiment does not need to move the locking assembly, and there is no need to provide a corresponding transmission structure between the operating assembly and the locking assembly. The structure has high reliability and is more reliable than the second embodiment. Simple, convenient to manufacture and save manufacturing cost.

As shown in FIG. 36, in order to facilitate the disassembly and assembly of the working head 40, the locking end 93" has a locking surface 97" for clamping the working head 40. The axial distance H between the locking surface 97" and the clamping axis 121' in the expanded state is between 8-12 mm. The locking surface 97" is a circular ring surface, and the locking surface 97" The outer diameter of can be the outer contour or the diameter of the outer circle. In this embodiment, the outer diameter L2 of the locking surface 97" of the locking component in the expanded state is between 13-16 mm. Further, the outer diameter L3 of the locking surface 97" of the locking assembly in the closed state is between 9-11 mm. The clamping assembly 33" is between the closed state and the expanded state The switching opening and closing angle α is between 20 degrees and 30 degrees.

Please refer to the schematic diagrams of the installation process of the working head 40 shown in FIGS. 37 to 39. The clamping assembly 33" is in the expanded state under the action of the holder, and the operator aligns the installation through hole of the working head 40 with the locking ends 93" of the plurality of locking parts 9" and continues to move toward the clamping assembly 33". The locking end 93" gradually extends into the installation through hole until the working head 40 is in initial contact with the outer wall of the locking end 93” as shown in Figure 37. At this time, part of the locking end 93” can have been extended into the installation through hole. In the middle, the outer wall of the locking end 93" starts to come into contact with the end of the installation through hole, but the locking end 93" is not folded inward, and continue to push the working head 40. The working head 40 will be as shown in Figure 38. Tuck the locking end 93" inward, and the length of the clamping assembly 33" extending into the installation through hole gradually increases. Correspondingly, the force pushing the working head 40 will gradually increase during this process. Finally, as shown in Figure 39 As shown, the entire locking end 93" all passes through the installation through hole, the narrowing part (also called the neck) on the upper side of the locking end 93” is aligned with the installation through hole, the locking end 93” loses the installation through hole The retracting effect of the, it quickly expands outwards, and the working head 40 is suspended. At this time, the operator does not need to hold the working head 40 and only needs to rotate the operating part in the C direction to lock the working head 40.

When the working head 40 needs to be disassembled, the clamping assembly 33" is in the disassembly and assembly mode as shown in Fig. 35. At this time, a downward force is applied to the working head 40 (such as a saw blade), which is in line with the clamping axis 121 'Form a moment to make the two locking ends 93" rotate towards each other, the clamping assembly 33" moves from the expanded state to the closed state, the locking end 93" in the closed state can pass through the installation through hole of the working head 40, correspondingly, Continue to push down the working head 40 so that the locking end 93" passes through the installation through hole to complete the disassembly of the working head.

As shown in FIG. 37, when the clamping assembly 33" is in an expanded state and the working head 40 is installed, the locking end 93" has an initial contact point 932 with the working head 40. As described in the previous paragraph, when the initial contact point 932 of the working head 40 is in contact with the locking end 93", the locking ends 93" of the plurality of locking members 9" begin to shrink inward but not inward. This initial contact point 932 is located on the side wall 931 below the locking surface 97". The side wall 931 may be a tapered surface or a curved surface, which is not limited in this application. Along the tangent direction 940 of the initial contact point 932, the distance L1 between the normal line of the initial contact point 932 and the clamping axis 121' is greater than 2 mm.

Any numerical value quoted herein includes all values of the lower value and the upper value in increments of one unit from the lower limit to the upper limit, and there is a gap of at least two units between any lower value and any higher value. can. For example, if it is stated that the number of a component or the value of a process variable (such as temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, the purpose is to illustrate the The specification also explicitly lists values such as 15 to 85, 22 to 68, 43 to 51, and 30 to 32. For values less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples intended to be clearly expressed, and it can be considered that all possible combinations of numerical values listed between the lowest value and the highest value are clearly set forth in this specification in a similar manner.

Unless otherwise stated, all ranges include endpoints and all numbers between endpoints. The use of "about" or "approximately" with a range applies to both end points of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the indicated endpoints.

All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of" describing a combination shall include the determined element, component, component or step and other elements, components, components or steps that do not substantially affect the basic novel characteristics of the combination. The use of the term "comprising" or "including" to describe a combination of elements, components, components or steps herein also contemplates an embodiment basically consisting of these elements, components, components or steps. The term "may" is used here to illustrate that any of the described attributes included in "may" are optional.

Multiple elements, components, components or steps can be provided by a single integrated element, component, component or step. Alternatively, a single integrated element, ingredient, component or step may be divided into separate multiple elements, ingredients, components or steps. The disclosure of "a" or "an" used to describe an element, ingredient, component or step does not mean to exclude other elements, ingredients, components or steps.

It should be understood that the above description is for illustration and not for limitation. By reading the above description, many implementations and many applications beyond the examples provided will be obvious to those skilled in the art. Therefore, the scope of the present teaching should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by these claims. For comprehensive purposes, all articles and references including patent applications and publications are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not to abandon the subject matter, nor should it be deemed that the inventor did not consider the subject matter as part of the disclosed subject matter of the invention.

Claims

A clamping device for a power tool, the clamping device is used to hold a working head on the power tool in a manner capable of moving around an output axis, and is characterized in that the clamping device comprises:

Clamping assembly, which forms an expanded state and a closed state by moving along the deviated axial direction;

Axial movement assembly; the axial movement assembly can move the clamping assembly in the axial direction, so that the clamping assembly has a first axial position and a second axial position;

Locking component; The locking component has a locking position and an unlocking position by action; when the locking component is in the locking position, the clamping component is locked in the expanded state; when the locking component is in the unlocking position , The clamping assembly can be switched to the closed state;

Wherein, there is relative movement between the locking component and the axially moving component; when the clamping component is located in the first axial position, the clamping component is in a clamping mode capable of clamping a working head; When the clamping assembly is in the second axial position and the locking assembly is in the unlocking position, the clamping assembly is in a disassembly and assembly mode that allows the working head to be released or installed.
The clamping device according to claim 1, wherein the locking assembly forms the locking position and the unlocking position by moving in an axial direction.
3. The clamping device according to claim 2, wherein from the clamping mode to the disassembling mode, the axial displacement of the locking component is greater than the axial displacement of the axial moving component.
The clamping device according to claim 1, wherein the locking assembly moves from the locking position to the unlocking position when the clamping assembly is in the second axial position.
The clamping device according to claim 1, characterized in that the clamping device further comprises an operating component for receiving applied force for action; the operating component can rotate around an operating axis perpendicular to the output axis; The operating component has an operating component and a driving component; the operating component can operatively drive the driving component to cooperate with and disengage the locking component and the axial moving component.
The clamping device according to claim 5, wherein the driving member is fixed on the operating member; the driving member has a first driving surface and a second driving surface surrounding the operating axis;

The locking assembly is provided with a first mating surface that is matched with the first driving surface; the axial movement assembly is provided with a second mating surface that is matched with the second driving surface;

The first driving surface is operably in contact with and disengaged from the first mating surface; the second driving surface is operably in contact with and disengaged from the second mating surface.
7. The clamping device according to claim 6, wherein the operating assembly has a disengagement position corresponding to the clamping mode and an unloading position corresponding to the disassembly mode;

When the operating component is in the disengaged position, the driving member does not contact the locking component and the axial moving component,

When the operating component is located in the unloading position, the driving part is kept in contact with the locking component and the axial moving component.
The clamping device according to claim 7, wherein the second driving surface has at least a first part for driving the axially moving component, and maintaining the axially moving component to be positioned with the second The second part of the corresponding position in the axial position; the part of the first driving surface that corresponds to the same central angle as the first part is used to drive the locking assembly; the part of the first driving surface corresponds to the second part The part with the same central angle is also used to drive the locking assembly.
The clamping device according to claim 7, wherein at least part of the second driving surface is a curved surface surrounding the operating axis; when the operating component is in the unloading position, the curved surface and the The axially moving components remain in contact.
The clamping device according to claim 1, further comprising: a first elastic member that applies a force to the axial movement component to move toward the position corresponding to the clamping mode, and to the locking The component applies a second elastic element that moves toward the position corresponding to the clamping mode; when the second elastic element is different from the first elastic element, it undergoes elastic deformation.