Power tool with quickly switchable output head

Abstract

The present invention discloses a power tool with a quickly switchable output head, which includes a housing. At least one working head detachably connected to the housing is provided on the housing. It further includes a switch assembly for controlling the rotation of the working head. A locking device is provided inside the housing. The locking device includes a locking seat, a pushing piece, a limiting disc and an elastic member. The limiting disc is rotatably connected to the locking seat. A groove is provided on the limiting disc, and a limiting protrusion is provided on the pushing piece. When the groove is aligned with the limiting protrusion, the locking device is in an unlocked state. When the groove is misaligned with the limiting protrusion, the locking device is in a locked state. The switch assembly includes an identification key. A pushing portion is provided at the bottom of the working head. When the working head is inserted into the housing, the pushing portion pushes the identification key to move relative to the housing. In the present invention, a locking device is provided on the housing. When the working head is pushed into the housing, the limiting disc rotates relative to the locking seat, automatically locking the working head. When unlocking, the limiting disc is toggled, and the elastic member automatically pushes the pushing piece to disengage the working head from the locking seat, which is convenient, fast and reliable for unlocking.

Description

Technical Field

[0001] The present invention belongs to the technical field of power tools, and particularly relates to a power tool with a quickly replaceable output head. Background Art

[0002] There are many types of power tools, such as polishers, gun drills, electric shovels, etc. These power tools are small, light, and flexible to use. Although they have different functions, their principles are mostly similar. They generally have a body and a working head. There is a driving motor inside the body, and the output shaft of the driving motor transmits power to the working head through a transmission component, enabling the working component to perform related functions. To save costs, there has emerged a multi-head combined power tool on the market. The head housing and the body housing of this tool are detachably connected, and the user can install different heads on the body according to the working needs. The existing working heads often have protrusions, and the body is provided with a switch button with a locking protrusion. Each time the working head is assembled, it is necessary to align the position of the body, and then rotate the working head so that the protrusion on the working head is misaligned with the protrusion on the body, so as to stably lock the working head. If the working head is not aligned with the body, the working head cannot be quickly matched with the body, and the switch button on the body cannot quickly lock the working head. At the same time, there is often a large vibration during the use of the power tool, and there is a slight deflection between the working head and the body. Therefore, when disassembling the working head, it is necessary to rotate the working head left and right to disengage from the body. Sometimes, in order to make the working head fit tightly with the body, the protrusions on the working head and the body fit closely, and a large torque is required to disengage the working head from the body. It can be seen that the existing working head cannot be quickly disassembled and assembled with the body, resulting in the inability to quickly start the power tool and poor user experience. Therefore, it is necessary to design a power tool with a quickly replaceable output head to overcome the above difficulties. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention designs a power tool with a quickly replaceable output head. The present invention is provided with a locking device on the housing. When the working head is pushed into the housing, the limiting disk rotates relative to the locking seat and automatically locks the working head. When unlocking, the limiting disk is toggled, and the elastic member automatically pushes the push piece to disengage the working head from the locking seat, which is convenient, fast, and reliable to unlock.

[0004] The object of the present invention is achieved by the following technical solutions: An electric tool with a quickly switchable output head, comprising a housing, at least one working head detachably connected to the housing, and a switch assembly for controlling the rotation of the working head. A locking device for locking the working head is provided inside the housing. The locking device includes a locking seat, a push piece, a limit disk, and an elastic member disposed between the locking seat and the push piece; the limit disk is disposed on the end face of the locking seat facing the working head and is rotatably connected to the locking seat. A number of evenly distributed grooves are provided on the limit disk, and limit protrusions matching the grooves are provided on the push piece; when the grooves are aligned with the limit protrusions, the locking device is in an unlocked state, and when the grooves are misaligned with the limit protrusions, the locking device is in a locked state; the switch assembly includes an identification key, and a pushing portion is provided at the bottom of the working head. When the working head is inserted into the housing, the pushing portion pushes the identification key to move relative to the housing.

[0005] Preferably, the locking device further includes a toggle switch, a first return spring, a snap ring, and a number of guide pins disposed inside the locking seat; the toggle switch is detachably connected to the limit disk and rotates synchronously therewith; a hollow mounting post is provided inside the locking seat, and the elastic member is sleeved and mounted on the mounting post; the push piece is in a disk shape and is sleeved and mounted on the outer layer of the mounting post. Guide pins are provided between the push piece and the mounting post; a snap ring for restricting the push piece from detaching from the mounting post is provided at the end of the mounting post; a first step is provided on the locking seat, and the push piece is mounted on the first step; one end of the first return spring is mounted on the locking seat, and the other end is connected to the toggle switch; a first protrusion is provided on the outer wall of the working head facing the locking device, and the outer contour of the first protrusion matches the outer contour of the groove.

[0006] One end of the first return spring is connected to the locking seat, and the other end is connected to the toggle switch. The first return spring is a tension spring. In the default state, the locking device is in the unlocked state, and the groove on the limit disk is aligned with the limit protrusion on the push piece. Since the used working head has been detached from the casing in the default state, when disassembling the working head, the operator needs to rotate the toggle switch to align the limit protrusion with the groove, so that the locking device will be in the unlocked state. When the limit protrusion is aligned with the groove, the elastic member pushes the push piece to move, and the limit protrusion on the push piece will be stuck in the groove, so that the locking device will be in the default unlocked state. When the locking device is in the unlocked state, the first return spring is in a stretched state. When installing the working head, directly push the push piece with the working head, and the push piece will squeeze the elastic member, then the groove on the limit disk will disengage from the limit protrusion on the push piece, and the first protrusion on the working head will push the push piece to move inside the locking seat. When the first protrusion is at the end of the limit disk facing the bottom of the locking seat, the limit protrusion loses the limit of the groove. Under the action of the elastic force of the first return spring, the limit disk drives the groove to rotate, and the limit protrusion and the groove will be completely misaligned, and the locking device will automatically be in the locked state. At this time, the first protrusion on the working head is clamped between the push piece and the limit disk, so that the working head can be stably locked on the casing. At the same time, an elastic member is provided between the push piece and the locking seat. When the locking state is in the locked state, the elastic member will squeeze and contact the push piece, so that the effect of clamping the first protrusion by the push piece and the limit disk is better. When the push piece squeezes the first protrusion, the first protrusion synchronously squeezes the limit disk. The limit disk itself is pulled by the first return spring, so that the limit disk is not easy to rotate relative to the locking seat, and the locking effect of the locking device is better. When it is necessary to switch the locking device from the locked state to the unlocked state, when rotating the toggle switch, the limit protrusion and the groove are aligned, then the elastic member will push the push piece to automatically push the working head out of the casing, and at this time, the limit protrusion on the push piece just gets stuck in the groove of the limit disk.

[0007] Preferably, a plurality of guide grooves for installing guide pins are provided on the outer wall of the mounting post. The push piece is hollow, and a plurality of concave notches matching the guide grooves are provided on the inner wall of the push piece. Each of the guide grooves corresponds to each of the concave notches one by one, and the outer contour of each of the guide grooves and each of the concave notches matches the outer contour of the guide pin. The guide grooves and the concave notches are coaxial with the guide pin. The length of the guide pin is less than the axial depth of the guide groove.

[0008] One end of the elastic member abuts against the bottom of the locking seat, and the other end of the elastic seat abuts against the surface of the push piece. By providing a guiding pin shaft, when the locking device is in the unlocked state, the push piece will move along the direction of the guiding pin shaft under the action of the elastic force of the elastic member, so that the push piece will automatically push the working head to move, causing the working head to quickly disengage from the casing. At the same time, since a number of guiding pin shafts are provided on the outer wall of the mounting post, the push piece will not rotate relative to the mounting post; the limiting protrusion on the push piece is always aligned with the first protrusion on the working head, so as long as the working head pushes the push piece, the groove on the limiting disc will move relative to the limiting protrusion, thus facilitating the switching of the working state of the locking device.

[0009] Preferably, an annular groove for installing a snap ring is provided at the end of the mounting post, and the snap ring is arranged in the annular groove; the snap ring is arranged adjacent to the guiding pin shaft and there is a gap between the two; the push piece is hollow and disc-shaped, and the outer diameter of the snap ring is larger than the inner diameter of the push piece.

[0010] By providing a snap ring, the push piece is prevented from detaching from the mounting post along the guiding pin shaft, so that the push piece can just be stuck in the groove; with the snap ring provided, the push piece can move reliably along the guiding pin shaft.

[0011] Preferably, a waist-shaped groove is provided at the top of the limiting disc, and a waist-shaped protrusion is provided at the bottom of the toggle switch. The outer contour of the waist-shaped protrusion matches the outer contour of the waist-shaped groove; the waist-shaped protrusion is arranged in the waist-shaped groove; a buckle for installing a first return spring is provided on the outer wall of the locking seat, and a mounting hole for installing a first return spring is provided on the toggle switch; when the toggle switch is pushed to rotate the limiting disc relative to the locking seat, the groove on the limiting disc automatically aligns with the limiting protrusion on the push piece, and when the toggle switch is released, the limiting disc automatically rotates relative to the locking seat under the action of the elastic force of the first return spring.

[0012] The limiting disc is detachably connected to the toggle switch, so that the toggle switch can conveniently drive the limiting disc to rotate when it rotates; one end of the first return spring is installed on the buckle, and the other end is installed in the mounting hole, so that the installation of the first return spring is more stable and reliable, thereby generating a stable elastic force. By rotating the toggle switch to rotate the limiting disc, the groove on the limiting disc will align with the limiting protrusion on the push piece. At this time, the push piece can move relative to the guiding pin shaft, and the first protrusion on the working head can move into the locking seat along the groove; when the working head is installed in the casing, the limiting disc automatically resets under the action of the elastic force of the first return spring, so that the locking device automatically switches from the unlocked state to the locked state, thus fixing the working head.

[0013] Preferably, the locking seat is installed in a casing, and a plurality of limit notches for limiting the rotation of the locking seat are provided in the casing, and a plurality of evenly distributed outer protrusions are provided on the end face of the locking seat facing away from the working head; the outer contour of the outer protrusions matches the outer contour of the limit notches, and the outer protrusions are arranged in the limit notches; a limit groove for limiting the axial movement of the locking seat is also provided on the casing, and the width of the limit groove is the same as the thickness of the locking seat; two end faces of the locking seat arranged parallel to each other are respectively fitted with the inner walls of the limit groove.

[0014] The locking seat is prevented from rotating relative to the body by the cooperation between the limiting notch and the outer protrusion; the locking seat is accommodated by the limiting groove, and the two parallel end faces of the locking seat are respectively in contact with the inner wall of the limiting groove, so that the locking seat will not move axially relative to the housing. Therefore, the locking seat can remain stable relative to the housing, and the locking seat will not move relative to the housing when the power tool is working. Then, when the working head needs to be disassembled, just turn the toggle switch, the limiting disk can rotate freely, so that the locking device is in the unlocked state, and the push piece can reliably push the working head out of the housing.

[0015] Preferably, the locking seat is provided with an arc-shaped opening for limiting the rotation angle of the limit disk, and the outer wall of the casing is provided with a makeshift opening for the rotation of the limit disk; the toggle switch is in contact with the inner wall of the arc-shaped opening and the locking device is in a locked state when the toggle switch is close to the top of the casing; the first protrusion on the working head and the limiting protrusion on the push piece correspond one to one, and the outer contours of the limiting protrusion and the first protrusion match each other; each of the limiting protrusions and each of the first protrusions are arranged on the same axis, and when the first protrusion on the working head passes through the groove on the limit disk, the first protrusion pushes the push piece to move relative to the guide pin shaft.

[0016] By setting the arc opening and the yielding opening, the toggle switch can be turned and the rotation angle of the toggle switch can be limited. When the working head is installed in the housing, the first return spring pulls the toggle switch, so that the locking device is in a locked state; since each of the first protrusions on the working head corresponds to each of the limit protrusions on the push piece, when the locking device is in an unlocked state, the limit protrusions also correspond to the grooves on the limit disk, so when the first protrusion on the working head is installed in the locking seat, it can smoothly pass through the groove and press the push piece, and then the first protrusion is at the end of the limit disk facing the locking seat; when the limit protrusion is completely out of the groove, the limit disk automatically rotates, and then the first protrusion is clamped between the push piece and the limit disk.

[0017] Preferably, the switch assembly further includes a second return spring, a lever, a driving member, a switch body and a button; the switch body and the button are connected and both are installed in the housing, one end of the driving member is hinged to the switch body, and the other end of the driving member is hinged to the lever; the housing is provided with a kidney-shaped hole for installing the lever, and both ends of the lever pass through the kidney-shaped hole; the housing is further provided with a guiding slot for installing the identification key, and when the pushing portion pushes the identification key, the identification key moves relative to the guiding slot; the lever is provided with a columnar protrusion, the identification key is in mutual contact with the upper end surface of the lever, and the identification key is further provided with a first notch for accommodating the columnar protrusion; when the columnar protrusion is in the first notch, the switch assembly is in a locked state, and when the columnar protrusion disengages from the first notch, the switch assembly is in an unlocked state.

[0018] In the default state, the working head is not installed on the housing and the locking device is in the unlocked state. Then, the identification key will abut against the end of the housing facing the working head under the action of the elastic force of the second return spring; at this time, the columnar protrusion on the lever is stuck in the first notch, so that the lever cannot move relative to the kidney-shaped hole on the housing; then the driving member cannot rotate relative to the lever, and the button cannot be toggled relative to the switch body, and the switch assembly is in the locked state; when the switch assembly is in the locked state, since the working head is not installed at this time, the motor in the housing can be prevented from idling and wasting the power of the battery pack; secondly, when the power tool does not have the working head installed, the output shaft part of the motor is exposed, which has a certain safety hazard; since the switch assembly is in the locked state at this time, the safety hazard of the exposed motor shaft can be eliminated. Only when the housing and the working head match each other can the switch assembly work properly. In this way, the housing has a certain ability to identify the working head, and the unmatched working head cannot be paired with the housing for use. Because the working head is provided with a pushing portion, and the size of the pushing portion matches the size of the housing, so that the pushing portion can be installed in the housing and push the identification key.

[0019] Preferably, the driving member is provided with an abutting portion, the button is provided with a limiting strip, and movable grooves are respectively arranged on both sides of the limiting strip; when the switch body is in the locked state, the abutting portion is in mutual contact with the limiting strip, and when the switch body is in the unlocked state, the abutting portion disengages from the limiting strip and is aligned with the movable groove; when the lever is pushed, the lever drives the driving member to rotate, and when the driving member rotates, it drives the abutting portion to rotate relative to the button.

[0020] In the default state, the columnar protrusion on the lever coincides with the first notch; at this time, the lever cannot move relative to the kidney-shaped hole, so the driving part hinged to the lever cannot rotate; at this time, the abutting part on the driving part fits with the limiting strip on the button, so the button cannot be toggled relative to the switch body; when the working head is inserted into the housing, the pushing part on the working head will push the identification key, then the columnar protrusion will disengage from the first notch, and the lever can move relative to the housing along the direction where the kidney-shaped hole is located; when the lever moves, it drives the driving part to rotate, and when the driving part rotates, the abutting part will disengage from the limiting strip and align with the movable groove, so that the button can be toggled relative to the switch body, thereby controlling the rotation of the motor.

[0021] Preferably, the identification key is provided with a strip-shaped hole for installing the second return spring, and the two ends of the second return spring respectively abut against the inner wall of the strip-shaped hole; there is also a columnar groove for accommodating the second return spring in the housing, and one end of the second return spring abuts against the inner wall of the columnar groove when the pushing part pushes the identification key to move.

[0022] When the working head is installed in the housing, the pushing part will push the identification key, so that the second return spring will be further compressed, and one end of the second return spring will abut against the end face of the columnar groove; when the working head is removed from the housing and the columnar protrusion on the lever is aligned with the first notch, the lever returns to the initial position at this time; then the identification key moves under the elastic force of the second return spring, the columnar protrusion fits with the first notch, and the identification key automatically returns to the initial position, so that the switch assembly will be in the locked state.

[0023] Compared with the prior art, the present invention has the following beneficial effects: The present invention is provided with a working head detachably connected to the casing, and the casing is further provided with a locking device for locking the working head; the locking device includes a limiting disc, a locking seat and a pushing piece, the limiting disc is provided with a groove, and the pushing piece is provided with a limiting protrusion; when the limiting disc is rotated, the groove on the limiting disc will move relative to the limiting protrusion, so as to facilitate switching the working state of the locking device; by default, the locking device is in the unlocked state, at this time the limiting protrusion is stuck in the groove, and the elastic member is in a compressed state; when the working head is pushed into the locking seat, the working head will be clamped between the limiting disc and the pushing piece; then the limiting disc rotates automatically under the action of the elastic force of the first return spring, so as to lock the working head; every time the user installs the working head into the casing, the locking device can automatically lock the working head; since an elastic member is provided between the pushing piece and the locking seat, the pushing piece will squeeze and contact the working head, and the cooperation between the working head and the casing is tighter, and the effect of clamping the working head by the pushing piece and the limiting disc is better, so that the locking device is stably maintained in the locked state. When the locking device is in the locked state, the elastic member is in a compressed state. Rotate the limiting disc to switch the locking device from the locked state to the unlocked state, then the limiting protrusion and the groove will be aligned, and the pushing piece can move relative to the locking seat, then the pushing piece pushes the working head to automatically disengage from the casing under the action of the elastic force of the elastic member. Therefore, the working head of the present invention can be automatically locked and automatically ejected relative to the casing, which is convenient for quickly and reliably replacing the working head, and the user experience is good. Description of the Drawings

[0024] Figure 1 is a perspective view of the present invention;

[0025] Figure 2 is an internal structure diagram of the present invention;

[0026] Figure 3 is an exploded view of the present invention;

[0027] Figure 4 is a perspective view of the locking device;

[0028] Figure 5 is an exploded view of the locking device;

[0029] Figure 6 is a schematic diagram of the locking state being in the unlocked state;

[0030] Figure 7 is a perspective view of the switch assembly;

[0031] Figure 8 is an exploded view of the switch assembly;

[0032] Figure 9 is a schematic diagram of the present invention without the working head installed.

[0033] Markings in the figure: 1, housing; 2, working head; 21, pushing part; 22, first protrusion; 3, switch assembly; 31, identification key; 32, second return spring; 33, lever; 34, driving member; 35, switch body; 36, button; 37, columnar protrusion; 38, first notch; 39, abutment; 310, limit strip; 311, movable groove; 312, strip hole; 4, locking device; 41, locking seat; 42, push piece; 43, limit plate; 44, elastic member; 45, Groove; 46, limiting protrusion; 47, toggle switch; 48, first return spring; 49, retaining spring; 410, guide pin; 411, mounting column; 412, guide groove; 413, concave notch; 5, first step; 6, annular groove; 7, waist-shaped groove; 8, waist-shaped protrusion; 9, buckle; 10, mounting hole; 11, limiting notch; 12, outer protrusion; 13, limiting groove; 14, arc-shaped opening; 15, clearance opening; 16, waist-shaped hole; 17, guide groove; 18, columnar groove. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0035] like Figures 1 to 9 As shown, this embodiment discloses an electric tool capable of quickly switching output heads, comprising a housing 1, wherein the housing 1 is provided with at least one working head 2 detachably connected thereto, and further comprising a switch assembly 3 for controlling the rotation of the working head 2, wherein a locking device 4 for locking the working head 2 is provided in the housing 1, wherein the locking device 4 comprises a locking seat 41, a push piece 42, a limit plate 43, and further comprising an elastic member 44 arranged between the locking seat 41 and the push piece 42; the limit plate 43 is arranged on the end surface of the locking seat 41 facing the working head 2 and is in contact with the locking seat 41. The seat 41 is rotatably connected, the limit plate 43 is provided with a plurality of evenly distributed grooves 45, and the push piece 42 is provided with a limit protrusion 46 matching the groove 45; when the groove 45 is aligned with the limit protrusion 46, the locking device 4 is in an unlocked state, and when the groove 45 is misaligned with the limit protrusion 46, the locking device 4 is in a locked state; the switch assembly 3 includes an identification key 31, and a pushing portion 21 is provided at the bottom of the working head 2. When the working head 2 is installed in the casing 1, the pushing portion 21 pushes the identification key 31 to move relative to the casing 1.

[0036] The locking device 4 further includes a toggle switch 47, a first return spring 48, a snap ring 49, and a plurality of guide pins 410 disposed within the locking base 41; the toggle switch 47 is detachably connected to the limit disk 43 and rotates synchronously therewith; the locking base 41 is provided with a hollow mounting post 411, and the elastic member 44 is sleeved on the mounting post 411; the push piece 42 is disc-shaped and is sleeved on the outer layer of the mounting post 411, and a guide pin 410 is provided between the push piece 42 and the mounting post 411; a snap ring 49 for restricting the push piece 42 from disengaging from the mounting post 411 is provided at the end of the mounting post 411; the locking base 41 is provided with a first step 5, and the push piece 42 is mounted on the first step 5; one end of the first return spring 48 is mounted on the locking base 41, and the other end is connected to the toggle switch 47; the outer wall of the working head 2 facing the locking device 4 is provided with a first protrusion 22, and the outer contour of the first protrusion 22 matches the outer contour of the groove 45. A plurality of guide grooves 412 for mounting the guide pins 410 are provided on the outer wall of the mounting post 411, the push piece 42 is hollow, and a plurality of concave notches 413 matching the guide grooves 412 are provided on the inner wall of the push piece 42; each of the guide grooves 412 corresponds to each of the concave notches 413 one by one, and the outer contour of each of the guide grooves 412 and each of the concave notches 413 matches the outer contour of the guide pin 410; the guide grooves 412 and the concave notches 413 are coaxially arranged with the guide pin 410; the length of the guide pin 410 is less than the axial depth of the guide groove 412. A circular groove 6 for mounting the snap ring 49 is provided at the end of the mounting post 411, and the snap ring 49 is disposed within the circular groove 6; the snap ring 49 is adjacent to the guide pin 410 and there is a gap between them; the push piece 42 is hollow and disc-shaped, and the outer diameter of the snap ring 49 is greater than the inner diameter of the push piece 42. A kidney-shaped groove 7 is provided at the top of the limit disk 43, and a kidney-shaped protrusion 8 is provided at the bottom of the toggle switch 47, and the outer contour of the kidney-shaped protrusion 8 matches the outer contour of the kidney-shaped groove 7; the kidney-shaped protrusion 8 is disposed within the kidney-shaped groove 7; a buckle 9 for mounting the first return spring 48 is provided on the outer wall of the locking base 41, and a mounting hole 10 for mounting the first return spring 48 is provided on the toggle switch 47; when the toggle switch 47 is pushed to rotate the limit disk 43 relative to the locking base 41, the groove 45 on the limit disk 43 automatically aligns with the limit protrusion 46 on the push piece 42, and when the toggle switch 47 is released, the limit disk 43 automatically rotates relative to the locking base 41 under the action of the elastic force of the first return spring 48.The locking seat 41 is installed in the machine housing 1. A number of limiting notches 11 for restricting the rotation of the locking seat 41 are provided in the machine housing 1. A number of uniformly distributed outward protrusions 12 are provided on the end face of the locking seat 41 facing away from the working head 2. The outer contour of the outward protrusion 12 matches the outer contour of the limiting notch 11, and the outward protrusion 12 is arranged in the limiting notch 11. A limiting groove 13 for restricting the axial movement of the locking seat 41 is further provided on the machine housing 1. The width of the limiting groove 13 is the same as the thickness of the locking seat 41. The two parallel end faces of the locking seat 41 are respectively in close contact with the inner wall of the limiting groove 13. An arc-shaped opening 14 for restricting the rotation angle of the limiting disk 43 is provided on the locking seat 41. A relief opening 15 for the rotation of the limiting disk 43 is provided on the outer wall of the machine housing 1. The toggle switch 47 is in close contact with the inner wall of the arc-shaped opening 14, and when the toggle switch 47 approaches the top of the machine housing 1, the locking device 4 is in a locked state. The first protrusions 22 on the working head 2 and the limiting protrusions 46 on the push piece 42 correspond one by one. The outer contour of the limiting protrusion 46 matches the outer contour of the first protrusion 22. Each of the limiting protrusions 46 and each of the first protrusions 22 are arranged on the same axis. When the first protrusion 22 on the working head 2 passes through the groove 45 on the limiting disk 43, the first protrusion 22 pushes the push piece 42 to move relative to the guide pin shaft 410.

[0037] The switch assembly 3 further includes a second return spring 32, a lever 33, a driving member 34, a switch body 35, and a button 36. The switch body 35 and the button 36 are connected and both are installed in the housing 1. One end of the driving member 34 is hinged to the switch body 35, and the other end of the driving member 34 is hinged to the lever 33. The housing 1 is provided with a kidney-shaped hole 16 for installing the lever 33, and both ends of the lever 33 pass through the kidney-shaped hole 16. The housing 1 is further provided with a guiding slot 17 for installing the identification key 31, and when the pushing portion 21 pushes the identification key 31, the identification key 31 moves relative to the guiding slot 17. The lever 33 is provided with a columnar protrusion 37, the identification key 31 is in mutual contact with the upper end surface of the lever 33, and the identification key 31 is further provided with a first notch 38 for accommodating the columnar protrusion 37. When the columnar protrusion 37 is in the first notch 38, the switch assembly 3 is in a locked state, and when the columnar protrusion 37 disengages from the first notch 38, the switch assembly 3 is in an unlocked state. The driving member 34 is provided with an abutting portion 39, the button 36 is provided with a limiting strip 310, and movable slots 311 are respectively arranged on both sides of the limiting strip 310. When the switch body 35 is in the locked state, the abutting portion 39 is in mutual contact with the limiting strip 310, and when the switch body 35 is in the unlocked state, the abutting portion 39 disengages from the limiting strip 310 and is aligned with the movable slot 311. When the lever 33 is pushed, the lever 33 drives the driving member 34 to rotate, and when the driving member 34 rotates, it drives the abutting portion 39 to rotate relative to the button 36. The identification key 31 is provided with a strip-shaped hole 312 for installing the second return spring 32, and both ends of the second return spring 32 respectively abut against the inner wall of the strip-shaped hole 312. There is also a columnar groove 18 for accommodating the second return spring 32 in the housing 1, and when the pushing portion 21 pushes the identification key 31 to move, one end of the second return spring 32 abuts against the inner wall of the columnar groove 18.

[0038] The specific operation process of this embodiment is as follows. In the default state, the locking device 4 is in the unlocked state, and the switch assembly 3 is in the locked state. At this time, the working head 2 is not installed on the housing 1. When the locking device 4 is in the unlocked state, the limiting protrusion 46 is stuck in the groove 45, the limiting protrusion 46 cannot rotate, and the first return spring 48 is in a stretched state. When the switch assembly 3 is in the locked state, the columnar protrusion 37 on the lever 33 is in the first notch 38 of the identification key 31, the lever 33 cannot be toggled, the abutting portion 39 on the driving member 34 is in mutual contact with the limiting strip 310 on the button 36, and the button 36 cannot be pushed towards the switch body 35.

[0039] When the working head 2 needs to be installed, hold the working head 2 and push it into the housing 1. The working head 2 pushes the push piece 42. Since the groove 45 on the limit disk 43 is aligned with the limit projection 46 on the push piece 42, when the working head 2 is pushed into the housing 1, the first projection 22 on the working head 2 first passes through the groove 45 and then pushes the push piece 42. The push piece 42 will move inward along the guiding pin shaft 410 into the locking seat 41. When the push piece 42 moves, the elastic member 44 is further compressed. When the working head 2 is at the end of the limit disk 43 facing the push piece 42, the limit projection 46 completely disengages from the groove 45. The limit disk 43 loses the restriction of the limit projection 46. The toggle switch 47 automatically resets under the action of the elastic force of the first return spring 48. When the toggle switch 47 resets, the limit disk 43 rotates synchronously, so that the groove 45 and the limit projection 46 are automatically misaligned, and the locking device 4 automatically switches from the unlocked state to the locked state. The first projection 22 on the working head 2 will be stably clamped between the push piece 42 and the limit disk 43. At this time, the elastic member 44 presses against and contacts the push piece 42, and the connection between the working head 2 and the housing 1 is more stable.

[0040] When the working head 2 is pushed into the housing 1, the pushing portion 21 on the working head 2 will push the identification key 31 along the guiding slot 17. In this way, the identification key 31 will move along the guiding slot 17, and the columnar projection 37 will disengage from the first notch 38. At this time, the switch assembly 3 is in the unlocked state, and the second return spring 32 on the identification key 31 is in the compressed state. Push the lever 33, and the driving member 34 hinged to the lever 33 will rotate. The abutting portion 39 on the driving member 34 will disengage from the limit strip 310 and face the movable slot 311. In this way, the button 36 can move relative to the switch body 35, and the switch assembly 3 can control the motor to work. When it is necessary to switch the working head 2, first move the lever 33 to the default initial position in advance, so that the columnar projection 37 on the lever 33 is aligned with the first notch 38 on the identification key 31. When the working head 2 is removed from the housing 1, the identification key 31 returns to the default initial position under the action of the elastic force of the second return spring 32. At this time, the columnar projection 37 is again in the first notch 38, and the switch assembly 3 switches from the unlocked state to the locked state.

[0041] When it is necessary to remove the working head 2 from the housing 1, only need to rotate the toggle switch 47 to align the groove 45 with the limit projection 46, and the locking device 4 will be in the unlocked state. The elastic member 44 will release the elastic force, thereby pushing the push piece 42 toward the end of the locking seat 410 facing the working head 2, so as to automatically push the working head 2 out of the housing 1. At this time, the limit projection 46 on the push piece 42 will be stuck in the groove 45, and the locking device 4 will be maintained in the unlocked state in the default state. Only when the working head 2 to be replaced is reinstalled into the housing 1, the locking device 4 will automatically switch from the unlocked state to the locked state. At the same time, only after the working head 2 is installed can the switch assembly 3 make the power tool energized to work.

[0042] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An electric tool with a quickly switchable output head, comprising a housing (1), at least one working head (2) detachably connected to the housing (1), and a switch assembly (3) for controlling the rotation of the working head (2), characterized in that, A locking device (4) for locking the working head (2) is provided inside the casing (1). The locking device (4) includes a locking seat (41), a push piece (42), a limit disc (43), and further includes an elastic member (44) disposed between the locking seat (41) and the push piece (42); the limit disc (43) is disposed on the end face of the locking seat (41) facing the working head (2) and is rotatably connected to the locking seat (41). A number of evenly distributed grooves (45) are provided on the limit disc (43), and a limit projection (46) matching the grooves (45) is provided on the push piece (42); when the grooves (45) are aligned with the limit projections (46), the elastic member (44) pushes the push piece (42), and the limit projections (46) on the push piece (42) are stuck in the grooves (45), and the locking device (4) is in an unlocked state; when the working head (2) pushes the push piece (42), the push piece (42) squeezes the elastic member (44), and the grooves (45) on the limit disc (43) are separated from the limit projections (46) on the push piece (42), and the grooves (45) are misaligned with the limit projections (46), and the locking device (4) is in a locked state; the switch assembly (3) includes an identification key (31), and a pushing portion (21) is provided at the bottom of the working head (2). When the working head (2) is inserted into the casing (1), the pushing portion (21) pushes the identification key (31) to move relative to the casing (1).

2. The power tool with a quickly switchable output head according to claim 1, wherein, The locking device (4) further includes a toggle switch (47), a first return spring (48), a snap ring (49), and a number of guide pins (410) disposed inside the locking seat (41); the toggle switch (47) is detachably connected to the limit disc (43) and rotates synchronously; a hollow mounting post (411) is provided inside the locking seat (41), and the elastic member (44) is sleeved and mounted on the mounting post (411); the push piece (42) is in a disc shape and is sleeved and mounted on the outer layer of the mounting post (411), and guide pins (410) are provided between the push piece (42) and the mounting post (411); a snap ring (49) for restricting the push piece (42) from detaching from the mounting post (411) is provided at the end of the mounting post (411); a first step (5) is provided on the locking seat (41), and the push piece (42) is mounted on the first step (5); one end of the first return spring (48) is mounted on the locking seat (41), and the other end is connected to the toggle switch (47); a first protrusion (22) is provided on the outer wall of the working head (2) facing the locking device (4), and the outer contour of the first protrusion (22) matches the outer contour of the grooves (45).

3. The power tool with a quickly switchable output head according to claim 2, wherein A plurality of guide grooves (412) for installing guide pins (410) are provided on the outer wall of the mounting post (411). The push plate (42) is hollow, and a plurality of concave notches (413) matching the guide grooves (412) are provided on the inner wall of the push plate (42); each of the guide grooves (412) corresponds to each of the concave notches (413), and the outer contour of each of the guide grooves (412) and each of the concave notches (413) matches the outer contour of the guide pin (410); the guide grooves (412) and the concave notches (413) are coaxially arranged with the guide pin (410); the length of the guide pin (410) is less than the axial depth of the guide groove (412).

4. The electric tool with a quickly switchable output head according to claim 3, characterized in that, An annular groove (6) for installing a snap ring (49) is provided at the end of the mounting post (411), and the snap ring (49) is arranged in the annular groove (6); the snap ring (49) is adjacent to the guide pin (410) and there is a gap between them; the push plate (42) is hollow and disc-shaped, and the outer diameter of the snap ring (49) is larger than the inner diameter of the push plate (42).

5. The electric tool with a quickly switchable output head according to claim 2, characterized in that, A kidney-shaped groove (7) is provided at the top of the limit disc (43), and a kidney-shaped protrusion (8) is provided at the bottom of the toggle switch (47). The outer contour of the kidney-shaped protrusion (8) matches the outer contour of the kidney-shaped groove (7); the kidney-shaped protrusion (8) is arranged in the kidney-shaped groove (7); a buckle (9) for installing a first return spring (48) is provided on the outer wall of the locking seat (41), and a mounting hole (10) for installing the first return spring (48) is provided on the toggle switch (47); when the toggle switch (47) is pushed to make the limit disc (43) rotate relative to the locking seat (41), the groove (45) on the limit disc (43) is automatically aligned with the limit protrusion (46) on the push plate (42), and when the toggle switch (47) is released, the limit disc (43) automatically rotates relative to the locking seat (41) under the action of the elastic force of the first return spring (48).

6. The power tool with a quickly switchable output head according to claim 5, wherein, The locking seat (41) is installed in the housing (1). A plurality of limit notches (11) for restricting the rotation of the locking seat (41) are provided in the housing (1). A plurality of uniformly distributed convex portions (12) are provided on the end face of the locking seat (41) facing away from the working head (2); the outer contour of the convex portion (12) matches the outer contour of the limit notch (11), and the convex portion (12) is arranged in the limit notch (11); a limit groove (13) for restricting the axial movement of the locking seat (41) is further provided on the housing (1), and the width of the limit groove (13) is the same as the thickness of the locking seat (41); the two parallel end faces of the locking seat (41) are respectively in contact with the inner walls of the limit groove (13).

7. The electric tool with a quickly switchable output head according to claim 2, wherein An arc-shaped opening (14) for restricting the rotation angle of the limit disk (43) is provided on the locking base (41), and a relief opening (15) for the rotation of the limit disk (43) is provided on the outer wall of the housing (1); when the toggle switch (47) is in mutual contact with the inner wall of the arc-shaped opening (14) and the toggle switch (47) approaches the top of the housing (1), the locking device (4) is in a locked state; the first protrusions (22) on the working head (2) and the limit protrusions (46) on the push piece (42) are in one-to-one correspondence, and the outer contour of the limit protrusion (46) matches that of the first protrusion (22); each limit protrusion (46) and each first protrusion (22) are arranged on the same axis, and when the first protrusion (22) on the working head (2) passes through the groove (45) on the limit disk (43), the first protrusion (22) pushes the push piece (42) to move relative to the guide pin shaft (410).

8. The electric tool with a quickly switchable output head according to claim 1, wherein, The switch assembly (3) further includes a second return spring (32), a lever (33), a driving member (34), a switch body (35) and a button (36); the switch body (35) and the button (36) are connected and both are installed in the housing (1), one end of the driving member (34) is hinged to the switch body (35), and the other end of the driving member (34) is hinged to the lever (33); a kidney-shaped hole (16) for installing the lever (33) is provided on the housing (1), and both ends of the lever (33) pass through the kidney-shaped hole (16) respectively; a guide slot (17) for installing the identification key (31) is further provided on the housing (1), and when the pushing portion (21) pushes the identification key (31), the identification key (31) moves relative to the guide slot (17); a columnar protrusion (37) is provided on the lever (33), the identification key (31) is in mutual contact with the upper end surface of the lever (33), and a first notch (38) for accommodating the columnar protrusion (37) is further provided on the identification key (31); when the columnar protrusion (37) is in the first notch (38), the switch assembly (3) is in a locked state, and when the columnar protrusion (37) disengages from the first notch (38), the switch assembly (3) is in an unlocked state.

9. The electric tool with a quickly switchable output head according to claim 8, characterized in that, A abutting portion (39) is provided on the driving member (34), a limiting strip (310) is provided on the button (36), and movable grooves (311) are respectively provided on both sides of the limiting strip (310); when the switch body (35) is in a locked state, the abutting portion (39) is in mutual contact with the limiting strip (310), and when the switch body (35) is in an unlocked state, the abutting portion (39) disengages from the limiting strip (310) and aligns with the movable groove (311); when the lever (33) is pushed, the lever (33) drives the driving member (34) to rotate, and when the driving member (34) rotates, it drives the abutting portion (39) to rotate relative to the button (36).

10. The electric tool with a quickly switchable output head according to claim 8, characterized in that, The identification key (31) is provided with a strip-shaped hole (312) for installing the second return spring (32), and both ends of the second return spring (32) respectively abut against the inner wall of the strip-shaped hole (312); there is also a columnar groove (18) for accommodating the second return spring (32) in the housing (1), and one end of the second return spring (32) abuts against the inner wall of the columnar groove (18) when the pushing part (21) pushes the identification key (31) to move.

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