Electric tool

Abstract

The utility model provides an electric tool which comprises a machine shell, a driving mechanism, a motor switch, a shaft lock mechanism and an operation piece, and the shaft lock mechanism comprises a first clutch piece and a second clutch piece which are matched with each other; the shaft lock mechanism is configured in the mode that when the first clutch piece and the second clutch piece are clamped, the output shaft cannot rotate relative to the machine shell. When the first clutch piece is separated from the second clutch piece, the output shaft can rotate relative to the machine shell. The operating part is configured to push the first clutch part to be separated from the second clutch part when the operating part moves towards the first direction and moves by a first stroke, and the motor switch is in a closed state when the operating part moves by a second stroke larger than the first stroke. According to the electric tool, the operating piece is matched with the shaft lock mechanism and the motor switch in structure, so that the starting action of the motor switch is later than the clutch state switching of the shaft lock mechanism, that is, starting is conducted after unlocking, motor stalling is avoided, the stalling risk during starting is reduced, and the service life of the electric tool is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power tools, in particular to an electric power tool. BACKGROUND

[0002] Electric power tools usually work after a working head is installed on an output shaft. When the working head is replaced, the output shaft or a driving shaft needs to be locked. For example, in a traditional electric grinder, a shutdown button and a shaft lock button are separately arranged. When an accessory is installed, the shutdown button and the shaft lock button need to be operated respectively to lock the output shaft, and then the working head is replaced. The user needs to operate in two steps, which is relatively cumbersome, and the use experience needs to be improved. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to provide an electric power tool integrating a switch and a shaft lock function.

[0004] In order to achieve one of the above purposes, the present application provides an electric power tool, which comprises:

[0005] a housing;

[0006] a driving mechanism arranged in the housing, the driving mechanism comprising a motor and an output shaft connected with the motor;

[0007] a motor switch having a closed state for controlling the motor to start and an open state for controlling the motor to stop;

[0008] a shaft lock mechanism comprising a first clutch member and a second clutch member cooperating with each other; the shaft lock mechanism is configured such that when the first clutch member engages with the second clutch member, the output shaft cannot rotate relative to the housing; when the first clutch member disengages from the second clutch member, the output shaft can rotate relative to the housing;

[0009] an operating member configured to push the first clutch member to disengage from the second clutch member when the operating member moves in a first direction by a first stroke, and the motor switch is in the closed state when the operating member moves by a second stroke greater than the first stroke.

[0010] Optionally, the operating member is further configured to make the motor switch in the open state when the operating member moves in a second direction opposite to the first direction by a third stroke, and the first clutch member engages with the second clutch member when the operating member moves by a fourth stroke greater than the third stroke.

[0011] Optionally, the first clutch member is mounted on the output shaft and rotates synchronously with the output shaft; the second clutch member is movably arranged in the housing, and the operating member is used to push the second clutch member to move.

[0012] Optionally, the first clutch member comprises a first clutch sleeve, the first clutch sleeve is sleeved on the output shaft, and the first clutch sleeve comprises a first positioning slot.

[0013] The second clutch member comprises a first positioning pin, and the first positioning pin is insertedly matched with the first positioning slot in the axial direction of the output shaft.

[0014] Optionally, the first clutch sleeve comprises a plurality of first positioning slots which are arranged at intervals in the circumferential direction of the first clutch sleeve.

[0015] The first positioning pin comprises a first guide portion, a first shaft shoulder portion and a first clamping portion which are distributed in the axial direction, the housing comprises a first guide slot, the first guide portion is guidedly matched with the first guide slot, the first shaft shoulder portion is used for being contacted with the operating member so as to move the first positioning pin along with the operating member, and the first positioning pin is insertedly matched with the first positioning slot through the first clamping portion.

[0016] Optionally, the first clutch member comprises a second positioning pin, the second positioning pin is fixed to the output shaft, an end portion of the second positioning pin protrudes outward from the outer circumferential surface of the output shaft, the second clutch member comprises a second clutch sleeve, the second clutch sleeve is sleeved on the output shaft, the second clutch sleeve comprises a second positioning slot, and the end portion of the second positioning pin is insertedly matched with the second positioning slot.

[0017] Optionally, the second positioning pin comprises a second clamping portion which protrudes outward from the outer circumferential surface of the output shaft, the second positioning pin is clampedly matched with the second positioning slot through the second clamping portion, the second clutch sleeve comprises a second body portion, the second body portion is provided with a mounting hole, the second clutch sleeve is sleeved on the output shaft through the mounting hole, the second positioning slot is arranged on the hole wall of the mounting hole, and the second body portion is used for being contacted with the operating member so as to move the second clutch sleeve along with the operating member in the axial direction.

[0018] Optionally, the electric tool further comprises a spring which is arranged between the housing and the shaft locking mechanism, and the spring is configured to store energy during the movement of the operating member in the first direction and release energy during the movement of the operating member in the second direction.

[0019] Optionally, the motor switch comprises a micro switch, and the micro switch comprises a pressing sheet.

[0020] The operating member comprises a trigger, the trigger is fixed with a pushing portion which is used for being matched with the shaft locking mechanism and a dialing portion which is used for dialing the pressing sheet.

[0021] Optionally, the housing comprises a positioning sliding groove, the operating member moves in the positioning sliding groove, the positioning sliding groove comprises a first positioning hole and a second positioning hole, the operating member comprises a positioning protrusion, the positioning protrusion is used for clamping into the first positioning hole or the second positioning hole.

[0022] The application further provides an electric tool, which comprises:

[0023] a housing;

[0024] a driving mechanism arranged in the housing, the driving mechanism comprising a motor and an output shaft connected with the motor;

[0025] a motor switch having a closed state for controlling the motor to start and an open state for controlling the motor to stop;

[0026] a shaft locking mechanism, the shaft locking mechanism comprising a first clutch sleeve and a first positioning pin, the first clutch sleeve is sleeved on the output shaft and rotates synchronously with the output shaft; the first positioning pin is movably arranged in the housing, the first positioning pin is selectively clamped or separated from the first clutch sleeve, when the first positioning pin is clamped with the first clutch sleeve, the output shaft cannot rotate relative to the housing, the shaft locking mechanism is in a locked state; when the first positioning pin is separated from the first clutch sleeve, the output shaft can rotate relative to the housing, the shaft locking mechanism is in an unlocked state;

[0027] and an operating member, the operating member is operable to move between a first limit position and a second limit position, to drive the motor switch and the shaft locking mechanism to switch states;

[0028] when the operating member is located at the first limit position, the motor switch is in the open state, and the shaft locking mechanism is in the locked state;

[0029] when the operating member is located at the second limit position, the motor switch is in the closed state, and the shaft locking mechanism is in the unlocked state.

[0030] Optionally, the first positioning pin and the first clutch sleeve are insertedly fitted along the axial direction of the output shaft, the first clutch sleeve comprises a first positioning groove;

[0031] the first positioning pin comprises a first guide portion, a first shaft shoulder portion and a first clamping portion arranged along the axial direction, the housing comprises a first guide groove, the first guide portion is guidedly fitted with the first guide groove; the first shaft shoulder portion is used for contacting the operating member during movement, so that the first positioning pin moves along the axial direction with the operating member; the first positioning pin is insertedly fitted with the first positioning groove through the first clamping portion.

[0032] The application also provides an electric tool, which comprises:

[0033] a housing;

[0034] a driving mechanism arranged in the housing, the driving mechanism comprising a motor and an output shaft connected with the motor;

[0035] a motor switch having a closed state for controlling the motor to start and an open state for controlling the motor to stop;

[0036] the shaft locking mechanism comprises a second positioning pin and a second clutch sleeve, the second positioning pin is fixed to the output shaft, an end of the second positioning pin protrudes outward from the outer circumferential surface of the output shaft, the second clutch sleeve is sleeved on the output shaft and is movably arranged relative to the housing, the second clutch sleeve comprises a second positioning groove, the end of the second positioning pin is selectively engaged with or disengaged from the second positioning groove, when the second clutch sleeve is engaged with the second positioning pin, the output shaft cannot rotate relative to the housing; the shaft locking mechanism is in a locked state; when the second clutch sleeve is disengaged from the second positioning pin, the output shaft can rotate relative to the housing; the shaft locking mechanism is in an unlocked state;

[0037] and an operating member, the operating member is operable to move between a first limit position and a second limit position to drive the motor switch and the shaft locking mechanism to switch states;

[0038] when the operating member is located at the first limit position, the motor switch is in the open state, and the shaft locking mechanism is in the locked state;

[0039] when the operating member is located at the second limit position, the motor switch is in the closed state, and the shaft locking mechanism is in the unlocked state.

[0040] Optionally, the second positioning pin comprises a second engaging portion protruding outward from the outer circumferential surface of the output shaft, the second positioning pin is engaged with the second positioning groove through the second engaging portion; the second clutch sleeve comprises a second body portion, the second body portion is provided with a mounting hole, the second clutch sleeve is sleeved on the output shaft through the mounting hole, the second positioning groove is arranged on the hole wall of the mounting hole, and the second body portion is used for contacting the operating member to enable the second clutch sleeve to move axially along with the operating member.

[0041] Optionally, the electric tool further comprises a spring arranged between the housing and the shaft locking mechanism, the spring is configured to store energy during movement of the operating member in a first direction and release energy during movement of the operating member in a second direction; during release of energy by the spring, the shaft locking mechanism switches the clutch state.

[0042] In the electric tool provided by the application, the operation member is used to control the switching of the on-off action of the switch and the switching of the clutch state of the shaft lock, so that the user can complete the starting and stopping and the switching of the shaft lock by a single operation, and the work head replacement process is simplified. In addition, through the structural cooperation of the operation member with the shaft lock mechanism and the motor switch, the starting action of the motor switch is later than the switching of the clutch state of the shaft lock mechanism, that is, the motor is started after the shaft lock is unlocked, the operation member simultaneously realizes the functions of starting and stopping and the shaft lock, the user's convenience is improved, the motor is prevented from being blocked, the risk of blocking during starting is reduced, and the service life and performance of the electric tool are improved. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0044] Figure 1 Structure schematic diagram of the electric tool of some embodiments of the application;

[0045] Figure 2 Structure schematic diagram of the electric tool of some embodiments of the application;

[0046] Figure 3 Structure schematic diagram of the first positioning pin in the electric tool of some embodiments of the application;

[0047] Figure 4 Structure schematic diagram of the operation member in the electric tool of some embodiments of the application;

[0048] Figure 5 Structure schematic diagram of the electric tool in the first limit position of some embodiments of the application;

[0049] Figure 6 Structure schematic diagram of the electric tool in the starting process of some embodiments of the application;

[0050] Figure 7 Structure schematic diagram of the electric tool in the second limit position of some embodiments of the application;

[0051] Figure 8 Structure schematic diagram of the electric tool in the second limit position of some other embodiments of the application;

[0052] Figure 9 Structure schematic diagram of the electric tool in the stopping process of some other embodiments of the application;

[0053] Figure 10Structure diagram of an electric tool according to some embodiments of the present application in a first limit position;

[0054] Figure 11 Structure diagram of an electric tool according to some embodiments of the present application in a second limit position;

[0055] Figure 12 Front view of an operating member in an electric tool according to some embodiments of the present application;

[0056] Figure 13 Top view of an operating member in an electric tool according to some embodiments of the present application;

[0057] Figure 14 Bottom view of an operating member in an electric tool according to some embodiments of the present application.

[0058] The following is a list of reference numerals:

[0059] 100, electric tool; 1, housing; 11, first guide slot; 2, driving mechanism; 21, motor; 22, output shaft; 3, motor switch; 4, shaft locking mechanism; 41, first clutch member; 42, second clutch member; 411, first clutch sleeve; 4110, first positioning slot; 421, first positioning pin; 4211, first clamping portion; 4212, first shaft shoulder portion; 4213, first guide portion; 412, second positioning pin; 4121, second clamping portion; 422, second clutch sleeve; 4220, second positioning slot; 4221, mounting hole; 43, guide member; 5, operating member; 50, hollowed-out slot; 51, pushing portion; 52, pushing portion; 53, positioning protrusion; 6, spring. DETAILED DESCRIPTION

[0060] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0061] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present application should be understood as their common meanings to those skilled in the art to which the present application pertains. The terms "first", "second" and similar terms used in the embodiments of the present application do not denote any order, quantity or importance, but are only used to distinguish different components. The terms "comprise", "include" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" and "connected" and similar terms do not mean only physical or mechanical connections, but can also include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0062] In order to simplify the replacement operation of the working head, in some related technologies, the shutdown button and the shaft locking button of the electric grinder are integrated into one switch push button, which can realize the function of "one key and two functions", that is, the user can realize the functions of starting and stopping the machine and unlocking and locking the output shaft by operating one switch. The clutch of the shaft locking mechanism can be controlled, the output shaft can be automatically locked when the machine is shut down, and the shaft can be automatically unlocked when the machine is started.

[0063] However, through long-term research by the inventor of the present application, it is found that in the related technologies, since the synchronization of the machine switch and the shaft lock is not synchronized, there is a certain risk, for example, when the user pushes the motor switch push button, the user does not push it to the position in an instant, at this time, the clutch of the shaft locking mechanism is in the state of being disconnected and not completely disconnected, but the motor has already started, in this case, it is equivalent to starting the motor in the blocked state. The blocked state can cause the current of the motor to increase sharply, which can cause damage to the motor and affect the service life and performance of the electric tool. In addition, in some related technologies, the parts of the clutch assembly are all in a sleeve shaft structure, which occupies a large space and is not conducive to miniaturization design.

[0064] Based on this, the present application provides an electric tool which integrates the functions of switch and shaft lock, is suitable for scenarios where the working head needs to be frequently replaced, and can solve the problem of blocked state caused by synchronous operation of switch and shaft lock. Furthermore, the structure can be further optimized to reduce the occupied space.

[0065] As shown in Figures 1 to 14 The embodiment of the present application provides an electric tool 100, which comprises a machine shell 1, a driving mechanism 2, a motor switch 3, a shaft locking mechanism 4 and an operating member 5. The driving mechanism 2 is arranged in the machine shell 1, and the driving mechanism 2 comprises a motor 21 and an output shaft 22 connected with the motor 21. The motor switch 3 has a closed state for controlling the motor 21 to start and an open state for controlling the motor 21 to stop. The shaft locking mechanism 4 comprises a first clutch member 41 and a second clutch member 42 which cooperate with each other. When the first clutch member 41 and the second clutch member 42 are engaged, the output shaft 22 cannot rotate relative to the machine shell 1, and the shaft locking mechanism 4 is in a locked state. When the first clutch member 41 and the second clutch member 42 are disengaged, the output shaft 22 can rotate relative to the machine shell 1, and the shaft locking mechanism 4 is in an unlocked state.

[0066] As shown in Figure 5 When the operating member 5 moves from the first limit position (shutdown position) to the first direction (X1 direction in the figure), the operating member 5 moves in the first direction by a first stroke, and the first clutch member 41 and the second clutch member 42 are pushed away, as shown in Figure 6 When the operating member 5 moves in the first direction by a second stroke, the motor switch 3 is in the closed state, the motor 21 is started, and finally the operating member 5 is positioned at the second limit position (start position), as shown inFigure 7 The first stroke and the second stroke refer to the current position of the operating member 5 relative to the initial position, for example, the current position of the operating member 5 relative to the first limit position. The second stroke is greater than the first stroke, and the second stroke can be less than or equal to the distance between the second limit position and the first limit position.

[0067] The electric tool 100 provided in the present application controls the switching of the on-off action of the switch and the switching of the clutch state of the shaft lock through the operating member 5, so that the user can complete the start-stop and shaft lock switching through single operation, simplifying the working head replacement process. In addition, through the structural cooperation of the operating member 5, the shaft lock mechanism 4 and the motor switch 3, the on action of the motor switch 3 is later than the switching of the clutch state of the shaft lock mechanism 4, that is, the motor is started after being unlocked, avoiding motor lock, reducing the risk of lock during starting, and improving the service life and performance of the electric tool 100.

[0068] In some embodiments, when the operating member 5 moves in the second direction (the X2 direction in the figure) opposite to the first direction, when the operating member 5 moves in the second direction by a third stroke, the motor switch 3 is in the off state, and when the operating member 5 moves in the second direction by a fourth stroke, the first clutch member 41 and the second clutch member 42 are engaged. The third stroke and the fourth stroke refer to the current position of the operating member 5 relative to the same position, for example, the current position of the operating member 5 relative to the second limit position. The fourth stroke is greater than the third stroke, and the fourth stroke is less than or equal to the distance between the first limit position and the second limit position. When the operating member 5 moves in the second direction, the motor switch 3 is first turned off, and then the first clutch member 41 and the second clutch member 42 are engaged, so that the off action is earlier than the shaft locking action, avoiding the output shaft 22 being locked when the motor 21 is not stopped during off, which causes lock, and further protecting the motor safety.

[0069] In some embodiments, the first clutch member 41 is installed on the output shaft 22 and rotates synchronously with the output shaft 22. The second clutch member 42 is movably arranged relative to the housing 1, and the operating member 5 is used to push the second clutch member 42 to move. The first clutch member 41 rotates synchronously with the output shaft 22, and the second clutch member 42 is pushed to move by the operating member 5, so that the clutch control of the shaft lock mechanism 4 is more direct and effective, and the precise control of the operating member 5 on the shaft lock state is facilitated.

[0070] In some specific embodiments, as Figures 1 to 7As shown, the first clutch component 41 includes a first clutch sleeve 411, which is fixedly installed on the outer periphery of the output shaft 22. The first clutch sleeve 411 includes a first positioning groove 4110. The second clutch component 42 includes a first positioning pin 421, which is inserted into the first positioning groove 4110 along the axial direction of the output shaft 22. Specifically, the first clutch sleeve 411 is press-fitted onto the output shaft 22. The axial insertion of the first positioning pin 421 and the first clutch sleeve 411 provides a pin structure that occupies less space and is simpler and more stable than a bushing structure. When implementing the shaft lock function, the insertion structure effectively transmits torque, ensuring that the output shaft 22 cannot rotate in the locked state, thus improving the reliability of the shaft lock.

[0071] Furthermore, the first clutch sleeve 411 includes a plurality of first positioning grooves 4110, which are spaced apart circumferentially along the first clutch sleeve 411. The first positioning pin 421 includes a first engaging portion 4211, a first guide portion 4213, and a first shoulder portion 4212 distributed axially. The housing 1 includes a first guide groove 11, and the first guide portion 4213 guides and engages with the first guide groove 11. The first shoulder portion 4212 contacts the operating member 5 so that the first positioning pin 421 is pushed by the operating member 5 and moves axially thereafter. The first positioning pin 421 can be inserted into the first positioning groove 4110 through the first engaging portion 4211 to achieve a plug-in engagement. Specifically, the plurality of first positioning grooves 4110 are evenly distributed on the outer periphery of the first clutch sleeve 411. Through multiple first positioning grooves 4110 and a first positioning pin 421 with a specific structure, in conjunction with the first guide groove 11 on the housing 1, the first positioning pin 421 can be accurately inserted into the first positioning groove 4110, and can also move smoothly along the axial direction under the push of the operating member 5, thereby improving the stability of the shaft locking mechanism 4.

[0072] In other specific embodiments, such as Figures 8 to 11 As shown, the first clutch component 41 includes a second locating pin 412, which is perpendicularly inserted through the output shaft 22. The end of the second locating pin 412 protrudes outward from the outer peripheral surface of the output shaft 22. The second clutch component 42 includes a second clutch sleeve 422, which is mounted on the outer periphery of the output shaft 22 and is axially movable relative to the output shaft 22. The second clutch sleeve 422 includes a second locating groove 4220, and the end of the second locating pin 412 is inserted into the second locating groove 4220. Of course, the second locating pin 412 may not be perpendicular to the output shaft 22; it can simply be fixed to the output shaft 22 and form a protrusion on the outer periphery of the output shaft 22.

[0073] The second positioning pin 412 and the second clutch sleeve 422 are in plug-in fit, which provides another possible structure for the shaft locking mechanism 4, and the shaft locking function can be achieved. The second positioning pin 412 can also save space compared with the shaft sleeve structure.

[0074] Further, the second positioning pin 412 includes a second clamping portion 4121 protruding from the outer circumferential surface of the output shaft 22, and the second positioning pin 412 is clamped with the second positioning groove 4220 through the second clamping portion 4121. The second clutch sleeve 422 includes a second body portion, and the second body portion is provided with a mounting hole 4221. The second clutch sleeve 422 is sleeved on the output shaft 22 through the mounting hole 4221, and the second positioning groove 4220 is arranged on the hole wall of the mounting hole 4221. The second body portion is in contact with the operating member 5 during movement, so that the second clutch sleeve 422 moves along the axial direction with the operating member 5. A guide 43 is arranged between the second clutch sleeve 422 and the housing 1, so that the second clutch sleeve 422 does not rotate during movement along the axial direction. Specifically, a plurality of second positioning grooves 4220 are uniformly distributed on the outer circumferential surface of the mounting hole 4221 and communicate with the mounting hole 4221.

[0075] In some embodiments, the power tool 100 further includes a spring 6 arranged between the housing 1 and the shaft locking mechanism 4. The spring 6 stores energy during movement of the operating member 5 in the first direction, and releases energy during movement of the operating member 5 in the second direction. By arranging the spring 6, energy can be stored and released during movement of the operating member 5, which can assist the shaft locking mechanism 4 to switch the clutch state, so that the clutch action of the shaft locking mechanism 4 is more accurate, and the user experience is improved.

[0076] Preferably, the spring 6 is a compression spring, and the spring 6 is connected between the housing 1 and the second clutch member 42, specifically on the side of the second clutch member 42 away from the first clutch member 41. One end of the spring 6 can move synchronously with the second clutch member 42, and the spring 6 can push the second clutch member 42 to move during release of the elastic force.

[0077] Of course, the spring 6 can also be a tensile spring, and the spring 6 is connected between the housing 1 and the second clutch member 42, specifically on the side of the second clutch member 42 close to the first clutch member 41.

[0078] In some embodiments, the motor switch 3 comprises a micro switch, and the micro switch comprises a pressing piece. The operating member 5 comprises a trigger, and the trigger is fixed with a pushing part 51 for cooperating with the shaft locking mechanism 4 and a pulling part 52 for cooperating with the motor switch 3. The start-stop of the power tool 100 can be realized by pressing and releasing the pressing piece of the micro switch. Specifically, the micro switch comprises contacts, and the closing and opening of the contacts control the on-off of the circuit when the motor 21 needs to start or stop. The pressing piece can keep the contacts stable in different states and change the state when subjected to external force, so as to realize the quick switching of the circuit. The pulling part 52 on the operating member 5 (such as the trigger) is in contact with the pressing piece. When the operating member 5 moves, the pressing piece of the micro switch is pressed by the pulling part 52, the contacts of the micro switch are controlled to be closed, and the starting is completed. When the pulling part 52 releases the pressing piece, the power tool 100 stops.

[0079] In some embodiments, the housing 1 comprises a positioning sliding groove, and the operating member 5 moves in the positioning sliding groove. The groove wall of the positioning sliding groove is provided with a first positioning hole and a second positioning hole, the operating member 5 comprises an operating member body, the operating member body is provided with a hollow groove 50 and a positioning protrusion 53, the positioning protrusion 53 is located on one side of the hollow groove 50, and the positioning protrusion 53 can be deformed on the operating member body through the hollow groove 50. The positioning protrusion 53 is used for being clamped into the first positioning hole or the second positioning hole to position the operating member 5. Specifically, when the operating member 5 is located at the first limit position, the positioning protrusion is clamped into the first positioning hole; when the operating member 5 is located at the second limit position, the positioning protrusion is clamped into the second positioning hole.

[0080] In other embodiments, the hollow groove 50 can be omitted, and a resilient member is arranged between the positioning protrusion 53 and the operating member body, so that the positioning protrusion 53 can be deformed relative to the operating member body.

[0081] The working principle of the power tool 100 provided by the embodiments of the present application is as follows:

[0082] As shown in Figure 5 When the operating member 5 is located at the first limit position and near the first limit position, the first clutch member 41 and the second clutch member 42 remain clamped, that is, the first positioning pin 421 is inserted into the first positioning groove 4110 of the first clutch sleeve 411, and the shaft locking mechanism 4 is in the locked state. At this time, the motor switch 3 is in the off state. Before the operating member 5 contacts the second clutch member 42, the spring 6 is in a natural state.

[0083] As shown in Figure 6As shown, the operation member 5 is pushed forward (first direction), the operation member 5 contacts and pushes the first positioning pin 421 through the pushing part 51, and the first positioning pin 421 is pushed to move, when the operation member 5 moves the first stroke, the first clutch 41 and the second clutch 42 are disengaged, the first positioning pin 421 is out of the first clutch sleeve 411, the shaft lock mechanism 4 is in the unlocked state, and the spring 6 is in the compressed state, at this time, the motor switch 3 has not been triggered.

[0084] As shown, Figure 7 the operation member 5 is continuously pushed forward, the first clutch 41 and the second clutch 42 remain disengaged, the shaft lock mechanism 4 is in the unlocked state, until the operation member 5 moves the second stroke and closes the motor switch 3 through the dialing part 52, starts the electric tool 100, and finally the operation member 5 is positioned at the second limit position. During the start-up process, the disengaging time of the first clutch 41 and the second clutch 42 is earlier than the closing time of the motor switch 3, which avoids the problem of locked-rotor during start-up.

[0085] When it is necessary to shut down, for example, as shown in Figure 8 , the operation member 5 is located at the second limit position, at this time, the motor switch 3 is closed, the first clutch 41 and the second clutch 42 are in the disengaged state, and the second clutch sleeve 422 does not contact the second positioning pin 412. The operation member 5 is dialled backward (second direction), and the spring 6 releases the elastic force, the operation member 5 leaves the pressing piece of the motor switch 3, so that the motor switch 3 is disconnected first, and the motor 21 stops running.

[0086] As shown in Figure 9 , Figure 10 , the dialing operation member 5 is continuously moved backward, under the action of the elastic force of the spring 6, the first clutch 41 and the second clutch 42 are in contact and engaged, that is, the second clutch sleeve 422 and the second positioning pin 412 are engaged, so that the shaft lock mechanism 4 is in the locked state. During the shutdown process, the engaging time of the first clutch 41 and the second clutch 42 is later than the disconnection time of the motor switch 3, which avoids the problem of locked-rotor during shutdown.

[0087] It should be noted that, during the shutdown process, if the positioning groove on the clutch sleeve and the corresponding positioning pin are on the same horizontal line, the two are directly engaged, and the output shaft is stopped; if they are not on the same horizontal line, the user rotates the output shaft 22 by a certain angle, and the two can be engaged.

[0088] For example, as shown in Figure 2As shown, four first positioning slots 4110 are evenly distributed in the circumference of the first clutch sleeve 411. When the first positioning pin 421 contacts the first clutch sleeve 411 but is not aligned with the first positioning slots 4110, the output shaft 22 is rotated by an angle less than or equal to 90 degrees, and the first clutch sleeve 411 rotates synchronously with the output shaft 22. Under the auxiliary action of the spring 6, the first positioning pin 421 is automatically inserted into the first positioning slots 4110 on the first clutch sleeve 411.

[0089] For example, Figure 11 As shown, four second positioning slots 4220 are evenly distributed in the circumference of the second clutch sleeve 422. When the second clutch sleeve 422 contacts the second positioning pin 412 but the second positioning slots 4220 are not aligned with the second positioning pin 412, the output shaft 22 is rotated by an angle less than or equal to 90 degrees, and the second positioning pin 412 rotates synchronously with the output shaft 22. Under the auxiliary action of the spring 6, the second positioning pin 412 is automatically inserted into the second positioning slots 4220 on the second clutch sleeve 422.

[0090] As shown, Figure 7 or Figure 8 As shown, when the operating member 5 is located at the second limit position, there is a gap between the first clutch member 41 and the second clutch member 42. The movement stroke of the operating member 5 from the second limit position to the first limit position is greater than the deformation amount of the spring 6. Thus, in the starting state, the first clutch member 41 and the second clutch member 42 are completely not in contact, avoiding the influence of the shaft lock mechanism 4 on the free rotation of the output shaft 22.

[0091] As shown, Figures 1 to 14 The embodiment of the present application also provides an electric tool 100, which comprises a housing 1, a driving mechanism 2, a motor switch 3, a shaft lock mechanism 4, and an operating member 5. The driving mechanism 2 is arranged in the housing 1, and the driving mechanism 2 comprises a motor 21 and an output shaft 22 connected with the motor 21. The motor switch 3 has a closed state for controlling the motor 21 to start and an open state for controlling the motor 21 to stop.

[0092] In one embodiment, as shown, Figures 1 to 7 The shaft lock mechanism 4 comprises a first clutch sleeve 411 and a first positioning pin 421. The first clutch sleeve 411 is sleeved on the output shaft 22 and rotates synchronously with the output shaft 22. The first positioning pin 421 is movably arranged relative to the housing 1, and the first positioning pin 421 is insertedly connected with the first clutch sleeve 411. When the first positioning pin 421 is engaged with the first clutch sleeve 411, the output shaft 22 cannot rotate relative to the housing 1, and the shaft lock mechanism 4 is in a locked state. When the first positioning pin 421 is disengaged from the first clutch sleeve 411, the output shaft 22 can rotate relative to the housing 1, and the shaft lock mechanism 4 is in an unlocked state.

[0093] In another embodiment, as shown,Figures 8 to 11 As shown, the shaft lock mechanism 4 comprises a second positioning pin 412 and a second clutch sleeve 422, the second positioning pin 412 is fixed to the output shaft 22, the end of the second positioning pin 412 protrudes outward from the outer circumferential surface of the output shaft 22, the second clutch sleeve 422 is sleeved on the output shaft 22 and is movably arranged relative to the casing 1, the second clutch sleeve 422 comprises a second positioning groove 4220, the end of the second positioning pin 412 is inserted and matched with the second positioning groove 4220, when the second positioning pin 412 is clamped with the second clutch sleeve 422, the output shaft 22 cannot rotate relative to the casing 1, the shaft lock mechanism 4 is in the locked state. When the second clutch sleeve 422 is disengaged from the second positioning pin 412, the output shaft 22 can rotate relative to the casing 1.

[0094] Wherein, the operating member 5 is operable to move between the first limit position and the second limit position to drive the motor switch 3 and the shaft lock mechanism 4 to switch states.

[0095] As shown in FIG. 2, when the operating member 5 is located at the first limit position, the motor switch 3 is in the open state, and the shaft lock mechanism 4 is in the locked state. Figure 5 As shown in FIG. 3, when the operating member 5 is located at the second limit position, the motor switch 3 is in the closed state, and the shaft lock mechanism 4 is in the unlocked state.

[0096] Figure 7 As shown in FIG. 3, when the operating member 5 is located at the second limit position, the motor switch 3 is in the closed state, and the shaft lock mechanism 4 is in the unlocked state.

[0097] The electric tool 100 provided by the embodiment of the present application controls the switching of the on-off action of the switch and the clutch state of the shaft lock through the operating member 5, and the user only needs to perform single operation to complete the start-stop and shaft lock switching, thereby simplifying the work head replacement process. In addition, the shaft lock mechanism 4 adopts the clutch structure of the pin shaft and the sleeve inserted and matched, which occupies smaller space than the double-sleeve structure. When the shaft lock function is implemented, the inserted and matched structure can stably transmit torque, so that the output shaft 22 cannot rotate in the locked state, thereby improving the shaft lock reliability.

[0098] Those skilled in the art should understand: the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope (including claims) of the present application is limited to these examples; under the idea of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present application as described above, which are not provided in details for the sake of brevity.

[0099] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.

[0100] ​The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A power tool, characterized in that, include: chassis; A drive mechanism is disposed within the housing, the drive mechanism including a motor and an output shaft connected to the motor; The motor switch has a closed state for controlling the motor to start and an open state for controlling the motor to stop; The shaft locking mechanism includes a first clutch and a second clutch that cooperate with each other; the shaft locking mechanism is configured such that: when the first clutch and the second clutch are engaged, the output shaft cannot rotate relative to the housing; when the first clutch and the second clutch are disengaged, the output shaft can rotate relative to the housing; The operating element is configured such that when the operating element moves in a first direction and travels a first stroke, it pushes the first clutch to disengage from the second clutch; when it travels a second stroke greater than the first stroke, the motor switch is in a closed state.

2. The power tool according to claim 1, characterized in that, The operating element is further configured such that when the operating element moves in a second direction opposite to the first direction, during the third stroke, the motor switch is in the off state, and when the movement is greater than the third stroke, the first clutch and the second clutch engage.

3. The power tool according to claim 2, characterized in that, The first clutch is mounted on the output shaft and rotates synchronously with the output shaft; the second clutch is movably disposed on the housing, and the operating element is used to push the second clutch to move.

4. The power tool according to claim 3, characterized in that, The first clutch component includes a first clutch sleeve, which is sleeved on the output shaft, and the first clutch sleeve includes a first positioning groove; The second clutch includes a first positioning pin, which is inserted into the first positioning groove along the axial direction of the output shaft.

5. The power tool according to claim 4, characterized in that, The first clutch sleeve includes a plurality of first positioning grooves spaced apart circumferentially along the first clutch sleeve; The first positioning pin includes a first guide portion, a first shoulder portion, and a first engaging portion distributed along the axial direction. The housing includes a first guide groove, and the first guide portion guides and engages with the first guide groove. The first shoulder portion is used to contact the operating member so that the first positioning pin moves with the operating member. The first positioning pin engages with the first positioning groove through the first engaging portion.

6. The power tool according to claim 3, characterized in that, The first clutch component includes a second positioning pin, which is fixed to the output shaft. The end of the second positioning pin protrudes outward from the outer peripheral surface of the output shaft. The second clutch component includes a second clutch sleeve, which is sleeved on the output shaft. The second clutch sleeve includes a second positioning groove, and the end of the second positioning pin is inserted into the second positioning groove.

7. The power tool according to claim 6, characterized in that, The second positioning pin includes a second engaging portion protruding from the outer circumferential surface of the output shaft. The second positioning pin engages with the second positioning groove through the second engaging portion. The second clutch sleeve includes a second body portion with a mounting hole. The second clutch sleeve is sleeved on the output shaft through the mounting hole. The second positioning groove is disposed on the wall of the mounting hole. The second body portion is used to contact the operating member so that the second clutch sleeve moves axially with the operating member.

8. The power tool according to claim 2, characterized in that, The power tool also includes a spring disposed between the housing and the shaft locking mechanism, the spring being configured to store energy during the movement of the operating member in the first direction and release energy during the movement of the operating member in the second direction.

9. The power tool according to claim 1, characterized in that, The motor switch includes a micro switch, and the micro switch includes a pressure plate; The operating element includes a trigger, on which a pushing part for cooperating with the shaft locking mechanism and a turning part for turning the pressure plate are fixed.

10. The power tool according to claim 1, characterized in that, The housing includes a positioning slide groove, and the operating member is guided to move in the positioning slide groove. The positioning slide groove includes a first positioning hole and a second positioning hole. The operating member includes a positioning protrusion, which is used to engage with the first positioning hole or the second positioning hole.

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