Angle grinder

Abstract

The utility model relates to an angle grinder which comprises a shell, a motor assembly contained in the shell, a transmission assembly driven by the motor assembly to operate and a trigger assembly for controlling the motor assembly to start and stop. The trigger assembly is provided with a trigger connected to the shell in a pivoted mode, a switch triggered by pressing of the trigger and a disconnection locking device installed on the trigger and used for keeping the trigger at the disconnection locking position, in the disconnection locking position, the disconnection locking device limits pivoting of the trigger, and the trigger does not trigger the switch; the trigger assembly is provided with a switch-on locking device which is arranged independently of the switch-off locking device and keeps the trigger at the switch-on locking position, a track mechanism is formed in the shell, the switch-on locking device is provided with a sliding element sliding on the track mechanism, an elastic part for biasing the sliding element and a locking part connected to the sliding element, and the elastic part is arranged at the switch-off locking position and keeps the trigger at the switch-on locking position. The trigger stops sliding of the locking piece at the on-locking position, the trigger triggers the switch at the on-locking position, and the locking piece abuts against the trigger to limit pivoting of the trigger.

Description

[Technical field]

[0001] The utility model relates to the technical field of electric tools, in particular to an angle grinder with an off-locking device and an on-locking device. [Background Technology]

[0002] In an angle grinder with a trigger, a switch connected to a motor can be turned on by pressing the trigger, thereby driving the motor to drive the top tool (cutting disc or grinding disc) to rotate. Furthermore, the trigger of such an angle grinder is often equipped with an off-locking device (anti-self-locking structure) and an on-locking device (self-locking structure). The off-locking device can keep the trigger in the off-locking position so as not to trigger the switch, and the on-locking device is used to maintain the trigger in the on-locking position so as to trigger the switch to keep the motor running.

[0003] In this trigger structure, the off-locking device and the on-locking device are integrated into a single part of the trigger, and there is such a linkage between the two: when the user releases the lock of the trigger by the off-locking device, only a slight pressing force is applied to the trigger to maintain the trigger in the on-locking position through the on-locking device. However, if the off-locking device is damaged or the trigger is pressed unexpectedly, the on-locking device can easily lock the trigger in the on-locking position, and the probability of the motor starting accidentally is also high.

[0004] In view of this, it is determined necessary to provide an improved angle grinder to overcome the defects of the prior art. [Contents of the utility model]

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an angle grinder with an off-locking device and an on-locking device, which has the advantages of safe operation and good user experience.

[0006] The utility model solves the problems of the prior art by adopting the following technical scheme: an angle grinder, comprising a housing, a motor assembly accommodated in the housing, a transmission assembly driven by the motor assembly, and a trigger assembly for controlling the start and stop of the motor assembly, wherein the trigger assembly comprises a trigger pivotally connected to the housing, a switch triggered by pressing the trigger, and a disconnection locking device installed on the trigger and keeping the trigger in a disconnection locking position, wherein the disconnection locking device limits the pivoting of the trigger, and the trigger does not trigger the switch, and the trigger assembly comprises an on-locking device independently provided from the off-locking device and keeping the trigger in a on-locking position, a track mechanism is formed inside the housing, and the on-locking device comprises a sliding element sliding on the track mechanism, an elastic element biasing the sliding element, and a locking element connected to the sliding element, wherein the trigger blocks the sliding of the locking element in the disconnection locking position, and the trigger triggers the switch in the on-locking position, and the locking element abuts against the trigger to limit the pivoting of the trigger.

[0007] A further improved solution is: the shell includes a cylindrical portion that accommodates the motor assembly and a handle unit connected to the cylindrical portion and accommodating the switch, the handle unit is formed by a first half shell and a second half shell covering each other, the track mechanism includes a first sliding space provided on the inner wall of the first half shell and a second sliding space provided on the inner wall of the second half shell, the sliding element has a base plate and a sliding plate connected to the base plate, the sliding plate is inserted into the first sliding space, the base plate is inserted into the second sliding space, and the sliding direction of the sliding element is parallel to the pivot axis of the trigger.

[0008] A further improved solution is: the trigger includes a trigger rod and a hook formed at the end of the trigger, and in the on-locking position, the locking member is clamped on the hook.

[0009] A further improved solution is: a first convex rib and a limiting portion formed on the end surface of the first convex rib are provided inside the first half shell, and the limiting portion is supported against the substrate.

[0010] A further improved solution is: the first half shell is provided with a second convex rib and a third convex rib at the lower end of the first convex rib, and the first sliding space is formed between the second convex rib and the third convex rib.

[0011] A further improved solution is: the second half shell is provided with a fourth rib on the inner wall, and the second sliding space is located inside the fourth rib.

[0012] A further improved solution is: the sliding element has a mounting groove and an opening that penetrate the substrate, the mounting groove and the opening divide the end of the substrate into a first guide rod and a second guide rod, and the elastic member is sleeved on the first guide rod and the second guide rod.

[0013] A further improved solution is: a support portion extends from the end surface of the first half shell at the second convex rib, and the substrate is supported by the support portion.

[0014] A further improvement is as follows: the first half shell has a through hole, the connection and locking device has an operating element connected to the sliding element, the operating element includes an end cap for the user to apply force, and the end cap passes through the through hole.

[0015] A further improvement is as follows: the sliding element has a fixed seat connected to the base plate, and the end cap is connected to the fixed seat via a connecting pin.

[0016] Compared with the prior art, the utility model has the following beneficial effects: a disconnect locking device and a trigger connection locking device that are independent of each other are arranged in the housing of the angle grinder; when the disconnect locking device is damaged, as long as the user does not press the connection locking device, the trigger cannot be locked in the connection locking position, and the motor cannot continue to operate, thereby effectively improving the operational safety of the machine; a track mechanism is arranged on the housing, and the connection locking device is provided with a sliding element and a locking piece, and the sliding of the lock sliding element in the track mechanism is indirectly driven to slide the locking piece, so that the locking piece is selectively held against the hook at the front end of the trigger by sliding, thereby realizing the locking and connection of the trigger, with an ingenious structure and flexible and simple operation; the connection locking device can be installed by only arranging a track mechanism and a through hole on the housing, and the manufacturing is simple and the cost is low. [Drawings]

[0017] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a three-dimensional schematic diagram of the angle grinder in the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of a first half shell of a handle unit in the angle grinder shown;

[0020] Figure 3 yes Figure 2 A partial enlarged view of the first half shell shown;

[0021] Figure 4 yes Figure 1 A schematic diagram of a second half shell of a handle unit in the angle grinder shown;

[0022] Figure 5 yes Figure 4 A partial enlarged view of the second half shell shown;

[0023] Figure 6 yes Figure 1 A schematic structural diagram of a locking device for a trigger assembly in an angle grinder;

[0024] Figure 7 yes Figure 1 A radial cross-sectional view of the angle grinder shown when the trigger is in a disconnected and locked state;

[0025] Figure 8 yes Figure 2 The first half shell and Figure 6 The assembly diagram of the on-lock device shown when the trigger is in the off-lock position;

[0026] Fig. 9 yes Figure 8 A partial enlarged view of the first half shell and the on-locking device shown;

[0027] Fig.10 yes Figure 4 The second half shell and Figure 6 The assembly diagram of the on-lock device shown when the trigger is in the off-lock position;

[0028] Fig.11 yes Fig.10 A partial enlarged view of the second half shell and the connection locking device shown;

[0029] Fig.12 yes Fig.10 A schematic assembly diagram of the second half housing and the on-locking device shown in another perspective when the trigger is in the off-locking position;

[0030] Fig.13 yes Fig.12 A partial enlarged view of the second half shell and the connection locking device shown;

[0031] Fig.14 yes Figure 1 A radial cross-sectional view of the angle grinder shown when the trigger is in the on-lock position;

[0032] Fig.15 yes Figure 8 The schematic diagram of the assembly of the first half shell and the on-locking device when the trigger is in the on-locking position;

[0033] Fig.16 yes Fig.15 A partial enlarged view of the first half shell and the locking device;

[0034] Fig.17 yes Fig.10The schematic diagram of the assembly of the second half shell and the on-locking device when the trigger is in the on-locking position;

[0035] Fig.18 yes Fig.17 A partial enlarged view of the second half shell and the connection locking device shown;

[0036] Fig.19 yes Fig.17 A schematic assembly diagram of the second half housing and the on-locking device shown in another perspective when the trigger is in the on-locking position;

[0037] Fig. 20 yes Fig.19 A partial enlarged view of the second half shell and the on-locking device is shown.

[0038] Meaning of the reference numerals in the figures:

[0039] Angle grinder 100 housing 1

[0040] Cylindrical portion 11 Handle unit 12

[0041] First half shell 12a Second half shell 12b

[0042] Ring portion 12c Grip portion 12d

[0043] Track mechanism 12e First ring portion 121

[0044] Through hole 121a First rib 121b

[0045] Second rib 121c Third rib 121d

[0046] Limiting portion 121e Supporting portion 121f

[0047] First sliding space 121g First root portion 122

[0048] Position limiting recess 122a Second ring portion 123

[0049] Fourth rib 123a Second sliding space 123b

[0050] Rib 123c Second root 124

[0051] Air inlet 125 Gear box 13

[0052] Air outlet 131 Top tool 2

[0053] Protective cover 3 Trigger assembly 4

[0054] Trigger 41 Trigger lever 411

[0055] The first pivoting portion 412 and the second pivoting portion 413

[0056] Hook 414 Switch 42

[0057] Disconnect locking device 43 knob 431

[0058] Force-applying end 431a Limiting hook portion 431b

[0059] Locking device 44 Sliding element 44a

[0060] Operating element 44b Base plate 441

[0061] Mounting groove 441a Opening 441b

[0062] First guide rod 441c Second guide rod 441d

[0063] Elastic member 441e Positioning plate 442

[0064] Locking member 442a Connecting plate 443

[0065] Sliding plate 444 Fixed seat 445

[0066] Plate portion 445a Column portion 445b

[0067] Connecting pin 446 End cap 447 [Specific implementation method]

[0068] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the words "upper", "lower", "front", "back", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0069] See also Figures 1 to 5 The embodiment of the utility model relates to an angle grinder 100, which is used for grinding and cutting workpieces such as metal and stone. The housing 1 of the angle grinder 100 is a three-section structure, including a cylindrical portion 11 that accommodates a motor assembly (not shown), a handle unit 12 for the user to hold and with a built-in trigger assembly 4, and a gear box 13 equipped with a transmission assembly (not shown). The trigger assembly 4 can control the operation of the motor assembly, thereby indirectly driving the transmission assembly to drive the top tool 2 at the lower end of the gear box 13 to work on the workpiece. The top tool 2 can be a cutting blade or a grinding disc, which is fixed to the main shaft through an upper pressure plate and a lower pressure plate.

[0070] The transmission assembly of the angle grinder 100 has a driving gear set that transmits the torque of the motor assembly to the main shaft. The driving gear set includes a first bevel gear connected to the motor assembly and a second bevel gear sleeved on the outside of the main shaft and meshing with the first bevel gear. The first bevel gear can drive the second bevel gear and the main shaft to operate synchronously. At the same time, the motor assembly and the transmission assembly will generate a large amount of heat during operation. If the heat is not discharged in time, it will inevitably cause damage to the machine. Therefore, a pair of air inlets 125 are provided at the front and rear ends of the handle unit 12, and an air outlet 131 is provided on the front side of the gear box 13. When the motor assembly rotates, the fan (not shown) will suck the cooling airflow outside the machine from the air inlet 125, and then flow through the motor assembly and the transmission assembly, and finally flow out from the air outlet 131, thereby completing the heat dissipation of the angle grinder 100.

[0071] If the angle grinder 100 is operated under incorrect conditions, the top tool 2 may break. If the broken metal fragments splash onto the user, the user may be easily injured. Therefore, a protective cover 3 needs to be provided on the outside of the top tool 2. The protective cover 3 is preferably a quick-change type, so that the user does not need tools to replace the protective cover 3, which is easy to operate and saves time.

[0072] Please continue to refer to Figures 1 to 5 As shown, the handle unit 12 is not a single part, but is composed of a first half shell 12a and a second half shell 12b that are overlapped on the left and right. If observed from the front-to-back direction, the handle unit 12 is composed of a front ring portion 12c and a rear grip portion 12d that are integrally connected. The ring portion 12c and the grip portion 12d are first defined here. The ring portion 12c and the first ring portion 121 and the second ring portion 123 are overlapped on the left and right, and the grip portion 12d is composed of a first root portion 122 and a second root portion 124 that are overlapped on the left and right. In other words, the first half shell 12a is composed of the first ring portion 121 and the first root portion 122 that are integrally connected, and the second half shell 12b is composed of the second ring portion 123 and the second root portion 124 that are integrally connected.

[0073] During production operation, if the angle grinder 100 is subjected to unexpected external force, the motor assembly may be accidentally started, and this unexpected start-up phenomenon often causes harm to the user. Therefore, the present embodiment is provided with a disconnection locking device 43. Figures 1 to 5The trigger assembly 4 has a trigger 41 installed on the grip portion 12d and a switch 42 accommodated in the grip portion 12d. The trigger 41 has a trigger rod 411 extending in the front-to-back direction and a hook portion 414 arranged at the front end of the trigger rod 411. The trigger rod 411 drives the entire trigger 41 to pivot through the first pivot portion 412 at the rear end of the grip portion 12d; the switch 42 is supported and positioned by the ribs on the inner walls of the first root portion 122 and the second root portion 124; further, the disconnect locking device 43 is arranged at the front end of the trigger rod 411 through the second pivot portion 413, which is configured as a knob 431, including a force-applying end 431a located on the lower side and a limiting hook portion 431b located on the upper side.

[0074] The disconnection locking device 43 can lock the trigger 41 in the following manner: a limit recess 122a is provided below the switch 42. If the trigger 41 is pressed upward, the trigger 41 will drive the limit recess 122a and the switch 42 to pivot upward. However, since the limit recess 122a and the limit hook 431b are arranged in a mutually locked shape, the limit hook 431b will limit the movement of the limit recess 122a, which makes it impossible for the trigger 41 to pivot. Here, the initial position where the trigger 41 cannot rotate is defined as the disconnection locking position. Furthermore, if the user wants to start the switch 42, he only needs to apply force to the force end 431a of the disconnection locking device 43 with his finger to rotate it, and then pull the trigger 41 to indirectly press the switch 42. At this time, the switch 42 can be turned on and the motor can also run accordingly.

[0075] When the switch 42 is turned on, if the user presses the trigger for a long time to keep the machine running, the operating experience will inevitably be reduced. To this end, the present embodiment provides a connection locking device 44 to solve this problem. The connection locking device 44 is movably installed inside the ring portion 12c. The installation structure of the connection locking device 44 is described below: Please continue to refer to Figures 1 to 5 The first ring portion 121 is penetrated by a through hole 121a from left to right, and a first rib 121b protruding from the inside of the first ring portion 121 is provided at the front end of the through hole 121a, and a limiting portion 121e extends from right to left on the surface of the first rib 121b; accordingly, the first ring portion 121 is also provided with a second rib 121c and a third rib 121d spaced apart from each other on the lower side of the first rib 121b, and the space spaced apart between the second rib 121c and the third rib 121d in the up and down directions is defined as a first sliding space 121g; a supporting portion 121f is also extended from the left end of the third rib 121d, and the supporting portion 121f is in the shape of a thin plate, and its upper end is flush with the upper end of the third rib 121d.

[0076] Further, go to Figure 4 and Figure 5The inner wall of the second ring portion 123 is provided with a fourth rib 123a, a second sliding space 123b is formed inside the fourth rib 123a, and a plurality of ribs 123c are provided on the inner wall of the fourth rib 123a corresponding to the second sliding space 123b; Figure 7 The support portion 121f, the first sliding space 121g and the second sliding space 123b constitute a track mechanism 12e for the sliding of the connection and locking device 44. It is worth noting that the support portion 121f needs to extend to the lower side of the fourth rib 123a, otherwise the track mechanism 12e will form a fault, making it impossible for the connection and locking device 44 to slide smoothly.

[0077] Please refer to Figure 6 Combined with Figures 1 to 5 The locking device 44 includes a sliding element 44a sliding in the track mechanism 12e and an operating element 44b for the user to operate to control the sliding of the sliding element 44a. The sliding element 44a includes a base plate 441, a positioning plate 442 and a connecting plate 443 respectively connected to the right end of the base plate 441. The width of the base plate 441 in the front-to-back direction is equal to the width of the second sliding space 123b in the front-to-back direction; the base plate 441 is penetrated by a mounting groove 441a and an opening 441b extending left and right in the up-down direction, and the length of the mounting groove 441a in the left-to-right direction is much greater than the length of the opening 441b in the left-to-right direction; the mounting groove 441a and the opening 441b define the base plate to form a first guide rod 441c and a second guide rod 441d, and the elastic member 441e can be inserted from the opening 441b and sleeved on the first guide rod 441c and the second guide rod 441d. The positioning plate 442 extends backward from the rear end surface of the base plate 441, and a locking member 442a is provided on the upper surface of the positioning plate 442. The locking member 442a can be set into a rectangular block shape or an irregular block shape with a conical surface; the connecting plate 443 extends downward from the rear end of the base plate perpendicular to the base plate 441, and a sliding plate 444 is also integrally extended from the rear end of the connecting plate 443.

[0078] The operating element 44b includes a fixed seat 445 connected to the substrate 441, a connecting pin 446 installed on the fixed seat 445, and an end cap 447 installed on the connecting pin 446. Specifically: the fixed seat 445 includes a plate portion 445a and a cylindrical portion 445b, the plate portion 445a extends upward from the right end of the substrate 441, and the cylindrical portion 445b extends to the right from the upper end of the plate portion 445a; the connecting pin 446 is fixed to the right side of the cylindrical portion 445b, and the two can be set to be an integral connection or a detachable connection; the end cap 447 and the connecting pin 446 are detachably connected, and the outer diameter of the end cap 447 is smaller than the outer diameter of the through hole 121a.

[0079] Next, the assembly of the connecting locking device 44 and the ring portion 12c is described: the prerequisite for installation is that the first half shell 12a and the second half shell 12b are in a separated state, and then the left end of the base plate 441 can be inserted into the second sliding space 123b, so that the rib 123c and the base plate 441 are in contact, so as to increase the relative friction between the rib 123c and the base plate 441, so that the sliding of the base plate 441 is not too sensitive, and the elastic member 441e needs to abut against the right end face of the fourth rib 123a; furthermore, the first half shell 12a can be moved closer to the second half shell 12b, so that the sliding plate 444 is inserted into the first sliding space 121g, at this time, the limit portion 121e abuts against the second guide rod 441d, and the end cap 447 is exposed from the through hole 121a.

[0080] Please refer to Figures 7 to 13 When the trigger 41 is in the unlocked position, the locking device 44 is in the following state: the right end face of the connecting plate 443 abuts against the left end face of the second rib 121c, the positioning plate 442 and the locking member 442a abut against the right end face of the trigger rod 411, the sliding plate 444 is completely located in the first sliding space 121g, the left end of the base plate 441 has just entered the second space, and the elastic member 441e is in a natural state; because the trigger rod 411 has the function of preventing the locking member 442a from sliding to the left at this time, the user cannot drive the locking member 442a to move by pressing the end cap 447; furthermore, the user can pull the trigger 41 upward at this time to make the trigger 41 press the switch, but after the user releases it, the trigger 41 will reset.

[0081] Please refer to Figures 14 to 20 The on-lock device 44 has the function of locking the trigger 41 in the on-lock position, which is the position where the trigger 41 turns on the switch 42 and enables the motor to continue to run. To fix the trigger 41 from the disconnected locking position to the connected locking position, the user needs to perform the following operations: press the trigger 41 to the bottom with one hand, and press the end cap 447 with the other hand to drive the locking member 442a to move to the left to the bottom, and then release the trigger 41. The trigger 41 will rebound at a certain angle, so that the hook 414 at the front end of the trigger rod 411 abuts against the locking member 442a, so that the locking member 442a prevents the trigger 41 from rebounding downward. At this time, the position where the trigger 41 abuts against the locking member 442a is the connected locking position. It is worth mentioning that the sliding direction of the sliding element 44a in this process is parallel to the pivot axis of the trigger 41; at this position, the right end face of the connecting plate 443 and the left end face of the second protrusion 121c are separated, a part of the sliding plate 444 leaves the first sliding space 121g and is supported on the supporting portion 121f, and the left end of the base plate 441 abuts against the left wall of the second sliding space 123b.

[0082] Furthermore, if the user wants to release the trigger 41 from the locked position, the user only needs to press the trigger 41 to the bottom again, and then the sliding element 44a will return to the initial position due to the resetting of the elastic member 441e. At this time, the user only needs to release the trigger 41, and the trigger 41 will return to the unlocked position.

[0083] The present invention is not limited to the above specific implementations. A person skilled in the art can easily understand that there are many alternatives to the angle grinder of the present invention without departing from the principle and scope of the present invention. The protection scope of the present invention shall be subject to the content of the claims.

Claims

1. An angle grinder, comprising a housing, a motor assembly housed in the housing, a transmission assembly driven by the motor assembly, and a trigger assembly for controlling the start and stop of the motor assembly, wherein the trigger assembly comprises a trigger pivotally connected to the housing, a switch triggered by pressing the trigger, and a disconnection locking device installed on the trigger and holding the trigger in a disconnection locking position, wherein the disconnection locking device restricts the pivoting of the trigger, and the trigger does not trigger the switch; characterized in that: The trigger assembly has an on-locking device which is independently arranged from the off-locking device and keeps the trigger in an on-locking position. A track mechanism is formed inside the shell. The on-locking device has a sliding element which slides on the track mechanism, an elastic element which biases the sliding element, and a locking element connected to the sliding element. In the off-locking position, the trigger blocks the sliding of the locking element. In the on-locking position, the trigger triggers the switch. The locking element abuts against the trigger to limit the pivoting of the trigger.

2. The angle grinder according to claim 1, characterized in that: The shell includes a cylindrical portion that accommodates the motor assembly and a handle unit connected to the cylindrical portion and accommodating the switch, the handle unit is formed by a first half shell and a second half shell covering each other, the track mechanism includes a first sliding space provided on the inner wall of the first half shell and a second sliding space provided on the inner wall of the second half shell, the sliding element has a base plate and a sliding plate connected to the base plate, the sliding plate is inserted into the first sliding space, the base plate is inserted into the second sliding space, and the movement direction of the sliding element is parallel to the pivot axis of the trigger.

3. The angle grinder according to claim 2, characterized in that: The trigger includes a trigger rod and a hook portion formed at an end of the trigger, and in the on-lock position, the locking member is clamped on the hook portion.

4. The angle grinder according to claim 2, characterized in that: A first convex rib and a limiting portion formed on an end surface of the first convex rib are provided inside the first half shell, and the limiting portion abuts against the base plate.

5. The angle grinder according to claim 4, characterized in that: The first half shell is provided with a second convex rib and a third convex rib at the lower end of the first convex rib, and the first sliding space is formed between the second convex rib and the third convex rib.

6. The angle grinder according to claim 5, characterized in that: The second half shell is provided with a fourth convex rib on the inner wall, and the second sliding space is located inside the fourth convex rib.

7. The angle grinder according to claim 6, characterized in that: The sliding element has a mounting groove and an opening penetrating through the base plate, the mounting groove and the opening divide the end of the base plate into a first guide rod and a second guide rod, and the elastic member is sleeved on the first guide rod and the second guide rod.

8. The angle grinder according to claim 5, characterized in that: A supporting portion extends from the end surface of the first half shell at the second convex rib, and the substrate is supported by the supporting portion.

9. The angle grinder according to claim 4, characterized in that: The first half shell has a through hole therethrough, the on-locking device has an operating element connected to the sliding element, the operating element includes an end cap for a user to apply force, and the end cap passes through the through hole.

10. The angle grinder according to claim 9, characterized in that: The sliding element has a fixing seat connected to the base plate, and the end cap is connected to the fixing seat through a connecting pin.

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