Handheld power tools with rotating handles

Abstract

This invention discloses a handheld power tool with a rotating handle, comprising a housing, a handle, a working head, a power mechanism, and a locking mechanism. The housing has a cylindrical connecting part with an annular groove. The handle has an opening for insertion of the connecting part, and the inner wall of the handle has an inner ring edge that slides with the annular groove. The locking mechanism is used to lock the relative rotation of the handle and the housing. The power mechanism is housed within the housing, and the working head is connected to the power mechanism. At least one tensioning mechanism is provided between the connecting part and the handle. The tensioning mechanism includes a top support member and a first elastic member acting on the top support member to provide elastic support. The top support member and the first elastic member support the handle and the connecting part, keeping the rotating connection position of the handle and the connecting part in a tensioned state to eliminate wobbling gaps, reduce the shaking caused by the handle during use, and improve the safety and user experience of the machine.

Description

Technical Field

[0001] This invention relates to a power tool, and more particularly to a handheld power tool with a rotary handle. Background Technology

[0002] With social development and technological advancements, the demand for handheld power tools, such as angle grinders, hedge trimmers, and grooving machines, is increasing, and their applications are becoming more widespread. To facilitate operation, some handheld power tools feature handles that can rotate relative to the machine body, greatly simplifying their use at different workstations or angles.

[0003] For example, patent CN209504031U discloses a power tool handle rotation interlocking mechanism, which includes a body and a handle. The handle is rotatably mounted on the body through a locking mechanism. The locking mechanism includes a horizontal push button that is slidably mounted on the handle and a return spring installed between the handle and the horizontal push button. The horizontal push button is provided with a locking block that locks with the body. The body is provided with several locking grooves that cooperate with the locking block to adjust the handle angle.

[0004] In the existing handle rotation structure, the handle and the housing are rotatably connected, and there is a certain gap at the connection. There is only one locking switch at this rotatable connection to lock relative rotation, which makes it impossible to solve the gap problem well. The gap causes the handle and the housing to wobble, resulting in a poor user experience and certain safety hazards. Summary of the Invention

[0005] Based on the aforementioned power tools with rotating handles, the handle and the housing are rotatably connected, and there is a certain gap at the connection. There is only one locking switch at the rotatable connection to lock relative rotation, which makes it impossible to solve the gap problem well. The gap causes the handle and the housing to wobble, resulting in a poor user experience. The present invention provides a handheld power tool with a rotating handle.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a handheld power tool with a rotating handle, comprising a housing, a handle, a working head, a power mechanism, and a locking mechanism. The housing has a cylindrical connecting part, and the circumferential sidewall of the connecting part has an annular track groove for the handle to rotate. The end of the handle has an opening for the connecting part to be inserted into. The inner wall of the handle has an inner ring edge that slides with the annular track groove. The handle is rotatably connected to the housing through the sliding fit between the inner ring edge and the annular track groove. The locking mechanism is used to lock the relative rotation of the handle and the housing. The power mechanism is housed within the housing, and the working head is connected to the power mechanism. The locking mechanism includes... The connection includes a slidable locking member mounted on the handle and a second elastic member installed between the locking member and the handle. The end face of the connection is provided with at least two locking grooves. The locking member is inserted into one of the locking grooves to lock the relative rotation of the handle and the housing. Moving the locking member to one side causes it to disengage from the locking groove, thereby releasing the lock between the handle and the housing. At least one tensioning mechanism is provided between the connection and the handle. The tensioning mechanism includes a top support member and a first elastic member acting on the top support member to provide elastic support force. The top support member and the first elastic member support the handle and the connection to keep the rotational connection position of the handle and the connection in a tensioned state, thereby eliminating wobbling gaps.

[0007] A further preferred embodiment of the present invention is as follows: the handle is provided with a first receiving portion for accommodating the top support member and the first elastic member. The first elastic member is supported between the top support member and the handle. When the locking member rotates to be opposite to one of the locking slots, the top support member rotates to be opposite to one of the remaining locking slots, and the top support member abuts against the locking slot for support.

[0008] A further preferred embodiment of the present invention is as follows: two annular track grooves are provided on the circumferential sidewall of the connecting part, and the two annular track grooves are separated by an annular spacer. Two inner ring edges are provided on the inner wall of the handle and slide in cooperation with the two annular track grooves respectively. Two first limiting blocks are provided on the annular spacer. A second limiting block is provided on the handle between the two inner ring edges. The second limiting block is inserted between the two first limiting blocks, and a space is formed between the two first limiting blocks for the second limiting block to slide relative to each other.

[0009] A further preferred embodiment of the present invention is as follows: the end face of the connecting part is provided with a through hole communicating with the inside of the housing, the inner wall of the through hole is provided with a protrusion, the number of protrusions is the same as the number of locking grooves, the locking grooves are provided on the protrusions, adjacent protrusions are connected by arc-shaped connecting ribs, and the connecting ribs are combined to form an annular ring coaxial with the connecting part. The annular ring is provided with a circular bearing seat coaxial with the connecting part. The bearing seat is integrally formed with multiple circumferentially distributed connecting beams. Any connecting beam extends radially outward along the bearing seat to the inner wall of the connecting rib or the protrusion. A fan-shaped hole is formed between two adjacent connecting beams. The outer wall of the connecting rib is provided with a supporting rib extending to the inner wall of the through hole.

[0010] A further preferred embodiment of the present invention is as follows: the top support is a sphere, a ball head, or a tapered pin, and the groove of the locking groove is provided with a flared opening having a taper or an arc, and the top support abuts against the flared opening.

[0011] A further preferred embodiment of the present invention is as follows: a circular protrusion is provided on the housing, a first step is formed between the protrusion and the housing, the connecting part is provided on the end face of the protrusion, the connecting part and the protrusion have different diameters and a second step is formed between them, and a protruding collar is provided on the end face of the handle with an opening, the collar being fitted around the outside of the protrusion.

[0012] A further preferred embodiment of the present invention is as follows: the locking member includes a main body, the handle is provided with a second receiving part for receiving the main body to slide inside, the main body is provided with a locking pin and a push plate that are engaged with the locking groove, the push plate extends out of the handle for pushing and pulling by hand, and the handle is provided with an opening for the push plate to extend out.

[0013] A further preferred embodiment of the present invention is as follows: the main body is provided with a front baffle plate located in front of the push plate and a rear baffle plate located behind the push plate; the second accommodating part is provided with a first sliding groove that slides with the front baffle plate and a second sliding groove that slides with the rear baffle plate on both sides.

[0014] When the push plate is subjected to a backward pushing force, the main body and the locking pin move backward, causing the locking pin to disengage from the locking groove, and the front cover plate moves to the movable opening to form a cover.

[0015] When the push plate loses force, the second elastic element pushes the main body and the locking pin forward, causing the locking pin to insert into the corresponding locking groove, and the rear baffle moves to the movable opening to form a blockage.

[0016] A further preferred embodiment of the present invention is as follows: four locking slots are provided, arranged in a ring around the axis of the connecting part on the end face of the connecting part; a tensioning mechanism is provided in a set, and the tensioning mechanism and the locking mechanism are located symmetrically on both sides of the rotation axis of the handle; a third step is provided between the locking pin and the main body; when the locking pin is inserted into the locking slot, the third step rests on the end face of the connecting part; two mounting platforms are provided inside the handle, and a first receiving part and a second receiving part are respectively provided on the two mounting platforms; the end faces of the two mounting platforms opposite to the connecting part are respectively provided with protrusions for the locking member and the top support member to extend out.

[0017] A further preferred embodiment of the present invention is as follows: the direction of the force exerted by the first elastic member between the handle and the top support member is parallel to the rotation axis of the handle, and the sliding direction of the locking member relative to the handle is parallel to the rotation axis of the handle.

[0018] Compared with the prior art, the advantage of the present invention is that by providing at least one tensioning mechanism between the connecting part and the handle, the tensioning mechanism includes a top support member and a first elastic member that acts on the top support member to provide elastic support force. The top support member and the first elastic member are supported between the handle and the connecting part, so that the rotational connection position of the handle and the connecting part is in a tensioned state, thereby eliminating the wobbling gap, reducing the shaking caused by the handle during use, improving the safety of the machine and the user experience, and preventing the user from abandoning the machine due to the insecurity caused by the shaking of the handle. Attached Figure Description

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0020] Figure 1 This is a schematic diagram of the overall structure of a power tool;

[0021] Figure 2 This is a cross-sectional diagram of a power tool;

[0022] Figure 3 for Figure 2 Enlarged view of a portion at point A;

[0023] Figure 4 for Figure 2 A magnified view of section B;

[0024] Figure 5 This is a schematic diagram of a cross-section of a power tool;

[0025] Figure 6 This is a schematic diagram of the front section of a power tool.

[0026] Figure 7 This is a schematic diagram of the rear structure of a power tool.

[0027] Figure 8 This is a split view of the handle section of a power tool.

[0028] Figure 9 Schematic diagram of the motor housing Figure 1 ;

[0029] Figure 10 Schematic diagram of the motor housing Figure 2 ;

[0030] Figure 11 Schematic diagram of the locking mechanism Figure 1 ;

[0031] Figure 12 Schematic diagram of the locking mechanism Figure 2 ;

[0032] Figure 13 This is a schematic diagram of the internal structure of the right half of the shell;

[0033] Figure 14 This is a schematic diagram of the internal structure of the left half of the shell;

[0034] Figure 15 A cross-sectional view of the power tool with the locking mechanism in the locked state;

[0035] Figure 16 A cross-sectional view of a power tool with the locking mechanism in the unlocked state;

[0036] Figure 17 This diagram shows the usage state of the handle rotating 90° clockwise relative to the housing.

[0037] Figure 18 A cross-sectional view of a power tool with the handle rotated 90° clockwise relative to the housing.

[0038] Figure 19 This diagram shows the usage state of the handle rotating 90° counterclockwise relative to the housing.

[0039] Figure 20 This is a cross-sectional view of a power tool with its handle rotated 90° counterclockwise relative to the housing.

[0040] In the diagram: 1. Housing; 2. Motor housing; 3. Head housing; 4. Working head; 5. Handle; 6. Receiving groove; 7. Push plate; 8. Arc-shaped edge; 9. Control switch; 10. Rotation axis; 11. Drive motor; 12. Driving bevel gear; 13. Output shaft; 14. Driven bevel gear; 15. Second positioning groove; 16. Second receiving part; 17. Second elastic element; 18. Movable opening; 19. Main body; 20. Positioning pin; 21. Mounting groove; 22. Locking pin; 23. Locking groove; 24. Connecting part; 25. Inner ring edge; 26. Annular track groove; 27. Annular spacer edge; 28. Third step; 29. ​​First step; 30. Protruding post; 31. Second step; 32. Collar; 33. Top support; 34. Flared opening; 35. First receiving part; 36. First positioning groove; 37. First elastic element; 38. First limiting block; 39. Second limiting block; 40. Locking element; 41. Opening; 42. Mounting platform; 43. Protrusion; 44. Wire; 45. Right half shell; 46. Left half shell; 47. Protrusion; 48. Connecting rib; 49. Through hole; 50. Supporting rib; 51. Bearing seat; 52. Connecting beam; 53. Fan-shaped hole; 54. Front cover plate; 55. Rear cover plate; 56. First mating block; 57. Arc-shaped protrusion rib; 58. Second mating block; 59. Slot; 60. Insert block; 61. Second slide groove; 62. First slide groove; 63. Holding center line. Detailed Implementation

[0041] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of the invention.

[0042] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0043] Figures 1-20As shown, a handheld power tool with a rotating handle includes a housing 1, a handle 5, a working head 4, a power mechanism, and a locking mechanism. The housing 1 has a cylindrical connecting part 24, and the circumferential side wall of the connecting part 24 has an annular track groove 26 for rotating the handle 5. The end of the handle 5 has an opening 41 for inserting the connecting part 24. The inner wall of the handle 5 has an inner ring edge 25 that slides with the annular track groove 26. The handle 5 is rotatably connected to the housing 1 through the sliding fit between the inner ring edge 25 and the annular track groove 26, so that the handle 5 can be rotated relative to the housing 1 to adjust the angle to meet the use of different work positions or different angle positions. When the handle 5 rotates relative to the housing 1 to adjust the angle, the inner ring edge 25 slides along the annular track groove 26. The locking mechanism is used to lock the relative rotation of the handle 5 and the housing 1 after the angle is adjusted. The power mechanism is housed in the housing 1, and the working head 4 is connected to the power mechanism. The power mechanism drives the working head 4 to move to perform operations. The handle 5 rotates relative to the housing 1 about the axis of rotation 10 with the axis of rotation 10 of the connecting part 24.

[0044] Figure 2 , Figure 3 , Figure 8 , Figure 15 , Figure 16 As shown, the locking mechanism includes a locking member 40 slidably disposed on the handle 5 and a second elastic member 17 disposed between the locking member 40 and the handle 5. At least two locking grooves 23 are provided on the end face of the connecting part 24. The locking member 40 is inserted into one of the locking grooves 23 to lock the relative rotation of the handle 5 and the housing 1. Moving the locking member 40 to one side causes the locking member 40 to overcome the elastic force of the second elastic member 17 and move away from the locking groove 23 to release the lock between the handle 5 and the housing 1.

[0045] Figure 6 As shown, preferably, the number of locking slots 23 is four. The four locking slots 23 are arranged in a ring around the axis of the connecting part 24 on the end face of the connecting part 24, so that the handle 5 can rotate 90° relative to the housing 1 to rotate the locking member 40 from a position opposite to one locking slot 23 to a position opposite to another adjacent locking slot 23.

[0046] Figure 11 , Figure 12 As shown, the locking member 40 includes a main body 19 that is slidably disposed in the handle 5. The main body 19 is provided with a locking pin 22 that engages with the locking groove 23 and a push plate 7 for the user to operate the main body 19 to slide. The handle 5 is provided with a second receiving part 16 for receiving the main body 19 to slide inside. The push plate 7 extends out of the handle 5 for the user to push and pull with their hand. The handle 5 is provided with an opening 18 for the push plate 7 to extend out.

[0047] Figure 1 , Figure 3As shown, the outer wall of the handle 5 has a raised edge, which forms a receiving groove 6 in which the extended push plate 7 moves. The aforementioned movable opening 18 is located at the bottom of the receiving groove 6. The top of the push plate 7 is higher than the edge of the groove opening of the receiving groove 6. The height of the groove opening of the receiving groove 6 gradually decreases from front to back. The front edge of the receiving groove 6 is connected to the movable opening 18 by an arc-shaped edge 8, so as to form a space in front of the movable opening 18 for a finger to be inserted to push the push plate 7 backward. In the locked state, the second elastic member 17 pushes... The main body 19 and the locking pin 22 move forward until the locking pin 22 is inserted into the corresponding locking groove 23. At this time, the push plate 7 is in contact with or close to the front edge of the movable opening 18. When unlocking is required, the user pushes the push plate 7 backward by hand, causing the push plate 7 to move the main body 19 and the locking pin 22 backward. The locking pin 22 disengages from the locking groove 23, releasing the lock on the handle 5 and the connecting part 24. At this time, the push plate 7 moves backward to be in contact with or close to the rear edge of the movable opening 18.

[0048] Preferably, the width of the push plate 7 is equal to or substantially equal to the width of the movable opening 18, so that the front and rear sliding of the main body 19 and the locking pin 22 is more stable.

[0049] Figure 3 , Figure 7 As shown, preferably, the second accommodating portion 16 is a second inner cavity for accommodating the main body portion 19 and the second elastic member 17. An extension opening 43 for the locking pin 22 to extend is formed on the front side of the second inner cavity. The second elastic member 17 is a second return spring, which is supported between the rear sides of the main body portion 19 and the second inner cavity to push the main body portion 19 and the locking pin 22 forward. A rearwardly protruding positioning post 20 is provided on the rear side of the main body portion 19. A second positioning groove 15 is formed on the rear side of the second inner cavity for the rear end of the second return spring to be inserted. The rear end of the second return spring is inserted into the second positioning groove 15 and abuts against the rear inner wall of the second positioning groove 15. The front end of the second return spring is sleeved on the outside of the positioning post 20 and abuts against the rear side of the main body portion 19. The front inner wall of the second inner cavity can limit the forward movement of the main body portion 19, or the forward movement of the main body portion 19 can be limited by the push plate 7 abutting against the front edge of the movable opening 18, thereby preventing the main body portion 19 from being pushed forward and disengaging from the second inner cavity by the second return spring.

[0050] The second elastic element 17 mentioned above is not limited to a spring; other elastic elements are also applicable to this patent, such as sheet springs.

[0051] Preferably, the locking pin 22 is cylindrical, and the locking groove 23 is a circular groove that mates with the locking pin 22. The locking pin 22 can be integrally formed with the main body 19, or the locking pin 22 and the main body 19 can be two independent parts fixedly connected. For example, the front side of the main body 19 has a mounting groove 21, and the locking pin 22 is inserted into the mounting groove 21 and tightly fitted and fixed to the main body 19.

[0052] The main body 19 is provided with a front cover plate 54 located in front of the push plate 7 and a rear cover plate 55 located behind the push plate 7. The second receiving part 16 is provided with a first slide groove 62 that slides with the front cover plate 54 and a second slide groove 61 that slides with the rear cover plate 55 on both sides.

[0053] Figure 15 , Figure 16 As shown, when the push plate 7 is subjected to a backward pushing force, the push plate 7 drives the main body 19 and the locking pin 22 to move backward, causing the locking pin 22 to disengage from the locking groove 23, and the front baffle plate 54 moves to the movable opening 18 to form a blockage; when the push plate 7 loses force, the second elastic member 17 pushes the main body 19 and the pin shaft forward, causing the locking pin 22 to insert into the corresponding locking groove 23, and the rear baffle plate 55 moves to the movable opening 18 to form a blockage.

[0054] The front cover plate 54 and the rear cover plate 55 cover the movable opening 18, which can prevent the internal structure of the handle 5 from being exposed through the movable opening 18 in the unlocked or locked state, making the structure more aesthetically pleasing. They also play a certain role in preventing foreign objects from entering the handle 5 through the movable opening 18 and affecting the movement of the main body 19. In addition, the sliding engagement between the front cover plate 54 and the first slide groove 62, and the sliding engagement between the rear cover plate 55 and the second slide groove 61, play a certain guiding role in the forward and backward movement of the main body 19 and the locking pin 22, making the forward and backward movement of the main body 19 and the locking pin 22 more stable and the locking effect more stable.

[0055] The front cover plate 54, the rear cover plate 55, the main body 19, the push plate 7 and the positioning post 20 are integrally formed.

[0056] Figure 2 , Figure 4 As shown, at least one tensioning mechanism is provided between the connecting part 24 and the handle 5. The tensioning mechanism includes a top support 33 and a first elastic member 37 that provides elastic support force on the top support 33. The top support 33 and the first elastic member 37 are supported between the handle 5 and the connecting part 24 so that the rotational connection position of the handle 5 and the connecting part 24 is in a tensioned state, so as to eliminate the shaking gap, reduce the shaking caused by the handle 5 during use, improve the safety of the machine and the user experience, and prevent the user from abandoning the machine due to the insecurity caused by the shaking of the handle 5.

[0057] The direction of the force exerted by the first elastic element 37 between the handle 5 and the top support 33 is parallel to the rotation axis 10 of the handle 5, so that the support effect of the top support 33 and the first elastic element 37 on the handle 5 and the connecting part 24 is optimal, and the wobbling gap is better eliminated.

[0058] The sliding direction of the locking member 40 relative to the handle 5 is parallel to the rotation axis 10 of the handle 5, so that the locking member 40 is not easy to get stuck when it moves to lock or unlock.

[0059] The handle 5 is provided with a first receiving portion 35 for accommodating the top support member 33 and the first elastic member 37. The first elastic member 37 is supported between the top support member 33 and the handle 5. When the locking member 40 rotates to be opposite to one of the locking grooves 23, the top support member 33 rotates to be opposite to one of the remaining locking grooves 23, and the top support member 33 abuts against the locking groove 23 for support.

[0060] When the handle 5 rotates relative to the housing 1, the top support 33 rotates with the handle 5. The top support 33 and the locking groove 23 are pressed together, causing the top support 33 to move away from the end face of the connecting part 24. The top support 33 moves out of the locking groove 23 and abuts against the end face of the connecting part 24. The top support 33 continues to rotate with the handle 5 until the top support 33 rotates to a position opposite to the next level locking groove 23. The first elastic member 37 pushes the top support 33 forward so that the top support 33 abuts against the locking groove 23. Thus, as the top support 33 rotates with the handle 5, it jumps between the four locking grooves 23 one level at a time. When the top support 33 lands on the locking groove 23, it provides a click feedback to the operating hand, improving the user experience when rotating. Furthermore, the cooperation between the top support 33 and the locking groove 23 ensures that the locking member 40 is aligned with the locking groove 23 to be inserted, facilitating operation.

[0061] Figures 6-10 As shown, preferably, the top support 33 is a sphere, a ball head, or a tapered pin. The groove of the locking groove 23 is provided with a flared opening 34 with a taper or arc. The top support 33 abuts against the flared opening 34. The contact between the flared opening 34 and the top support 33 increases the contact area, so that the top support 33 is more stably supported between the connecting part 24 and the handle 5, so as to achieve a better tensioning effect.

[0062] Figure 4 , Figure 7 As shown, preferably, the first accommodating portion 35 is a first inner cavity for accommodating the top support member 33 and the first elastic member 37. The front side of the first inner cavity has an extension opening 43 for the top support member 33 to extend out. The first elastic member 37 is a first return spring. The first return spring is supported between the top support member 33 and the rear side of the first inner cavity to push the top support member 33 forward so that the top support member 33 can be supported on the end face of the connecting portion 24. The rear side of the first inner cavity has a first positioning groove 36 for the rear end of the first return spring to be inserted into. The rear end of the first return spring is inserted into the first positioning groove 36 and abuts against the rear inner wall of the first positioning groove 36.

[0063] The first elastic element 37 mentioned above is not limited to a spring; other elastic elements are also applicable to this patent, such as sheet springs.

[0064] Figure 7 , Figure 8 As shown, preferably, a tensioning mechanism is provided in one set. The tensioning mechanism and the locking mechanism are located symmetrically on both sides of the rotation axis 10 of the handle 5. A third step 28 is provided between the locking pin 22 and the main body 19. When the locking pin 22 is inserted into the locking groove 23, the third step 28 rests on the end face of the connecting part 24. At this time, the main body 19 and the second elastic member 17 are also supported between the handle 5 and the housing 1 to provide tension. By setting the tensioning mechanism and the locking mechanism symmetrically on both sides of the rotation axis 10, the tension is more symmetrical and balanced, achieving a better tensioning effect. The number of tensioning mechanisms provided in this patent is not limited to one set; one set is only preferred, and two or more sets are also applicable to this patent.

[0065] The handle 5 has two mounting platforms 42 located on opposite sides inside the handle 5. The first accommodating part 35 and the second accommodating part 16 are respectively disposed on the two mounting platforms 42. The end faces of the two mounting platforms 42 opposite to the connecting part 24 are respectively provided with protrusions 43 for the locking member 40 and the top support member 33 to extend out.

[0066] Figure 3 , Figure 4 As shown, preferably, the circumferential sidewall of the connecting part 24 is provided with two annular track grooves 26, which are separated by an annular spacer 27. The inner wall of the handle 5 is provided with two inner ring edges 25, which are slidably engaged with the two annular track grooves 26 respectively. The annular spacer 27 is provided with two spaced first limiting blocks 38. The handle 5 is provided with a second limiting block 39 located between the two inner ring edges 25. The second limiting block 39 is inserted between the two first limiting blocks 38, and a space is formed between the two first limiting blocks 38 for the second limiting block 39 to slide relative to each other. The angle range of relative rotation between the handle 5 and the housing 1 is limited by the cooperation of the two first limiting blocks 38 and the second limiting block 39.

[0067] Figure 1 , Figure 5 , Figures 17-20As shown, for example, the locking grooves 23 on the end face of the connecting part 24 are located in the four directions of up, down, left, and right. When the handle 5 is in the 0° position, the locking pin 22 and the top support 33 are respectively engaged in the upper and lower locking grooves 23. The second limiting block 39 is located in the middle of the two first limiting blocks 38. The angle between the left side of the second limiting block 39 and the left first limiting block 38 is 90°, and the angle between the right side of the second limiting block 39 and the right first limiting block 38 is 90°. When the handle 5 moves from the 0° position relative to the first limiting block 38, the locking pin 22 and the top support 33 are engaged in the upper and lower locking grooves 23 respectively. When the housing 1 rotates 90° clockwise, the handle 5 is at the 90° position. The locking pin 22 and the top support 33 rotate with the handle 5 until they are locked in the left and right locking slots 23. The second limiting block 39 abuts against the upper limit of the first limiting block 38 on the left. When the handle 5 rotates 90° counterclockwise from the 0° position relative to the housing 1, the handle 5 is at the -90° position. The locking pin 22 and the top support 33 rotate with the handle 5 until they are locked in the left and right locking slots 23. The second limiting block 39 abuts against the upper limit of the first limiting block 38 on the right.

[0068] In addition, the two annular track grooves 26 are slidably engaged with the two inner ring edges 25, which increases the support between the handle 5 and the connecting part 24, making the connection between the handle 5 and the connecting part 24 more stable, thereby reducing shaking.

[0069] Figure 13 , Figure 14 As shown, the handle 5 includes a left half shell 46 and a right half shell 45. The left half shell 46 and the right half shell 45 are connected and fixed by screws after being engaged. The inner walls of the left half shell 46 and the right half shell 45 are provided with arc-shaped ribs 57. The left half shell 46 and the right half shell 45 are also provided with first mating blocks 56. When the left half shell 46 and the right half shell 45 are engaged and connected, the arc-shaped ribs 57 on the left half shell 46 and the arc-shaped ribs 57 on the right half shell 45 combine to form the inner ring edge 25. The first mating blocks 56 on the left half shell 46 and the first mating blocks 56 on the right half shell 45 are engaged to form the two mounting platforms 42. The two sets of first mating blocks 56 respectively surround to form the first accommodating part 35 and the second accommodating part 16. The second limiting block 39 is also formed by the combination of the second mating blocks 58 on both sides when the left half shell 46 and the right half shell 45 are engaged. This structure facilitates the processing of the handle 5 and the installation of the locking mechanism and the tensioning mechanism.

[0070] A plug 60 is provided on one of the mating surfaces of the left half shell 46 and the right half shell 45, and a slot 59 is provided on the other mating surface. When the left half shell 46 and the right half shell 45 are mated, the plug 60 is inserted into the slot 59 to position the left half shell 46 and the right half shell 45, which facilitates the installation of the left half shell 46 and the right half shell 45.

[0071] The housing 1 is provided with a circular protrusion 30, and a first step 29 is formed between the protrusion 30 and the housing 1. The connecting part 24 is provided on the end face of the protrusion 30. The connecting part 24 and the protrusion 30 have different diameters and a second step 31 is formed between them. The handle 5 has a protruding collar 32 on the end face of the end with the opening 41. The collar 32 is fitted on the outside of the protrusion 30. The collar 32 and the protrusion 30 cooperate to increase the length of the connection between the handle 5 and the housing 1, improve the stability of the connection between the handle 5 and the housing 1, and reduce the shaking between the handle 5 and the housing 1.

[0072] Figure 10 As shown, the end face of the connecting part 24 is provided with a through hole 49 communicating with the inside of the housing 1. The inner wall of the through hole 49 is provided with a protrusion 47. The number of protrusions 47 is the same as that of the locking groove 23. One locking groove 23 is provided on one protrusion 47. Adjacent protrusions 47 are connected by an arc-shaped connecting rib 48. The connecting ribs 48 are combined to form an annular ring coaxial with the connecting part 24. Inside the annular ring is a circular bearing seat 51 coaxial with the connecting part 24. The bearing seat 51 is integrally formed with multiple circumferentially distributed connecting beams 52. Any connecting beam 52 extends radially outward along the bearing seat 51 to the inner wall of the connecting rib 48 or the protrusion 47. A fan-shaped hole 53 is formed between two adjacent connecting beams 52. The outer wall of the connecting rib 48 is provided with a supporting rib 50 extending to the inner wall of the through hole 49.

[0073] Since the connecting part 24 is generally made of plastic, the plastic material is prone to elastic deformation under pressure during use. Deformation of the connecting part 24 can easily increase the wobbling gap between the housing 1 and the handle 5. The connecting rib 48, the supporting rib 50 and the connecting beam 52 work together to strengthen the connecting part 24, reduce the deformation of the connecting part 24 during use, and thus reduce the wobbling between the housing 1 and the handle 5.

[0074] Furthermore, the holes formed by the interlacing of the connecting ribs 48, the supporting ribs 50, and the connecting beams 52 can also be used to connect the wires 44 inside the handle 5 to the housing 1, and can also be used for heat dissipation of the power mechanism. The power mechanism includes a drive motor 11 for outputting power, one end of which is supported by a bearing mounted on the aforementioned bearing seat 51.

[0075] The handle 5 is equipped with a control switch 9.

[0076] The grip center line 63 of the handle 5 is parallel or substantially parallel to the rotation axis 10 of the handle 5.

[0077] This structure can be applied to handheld power tools such as angle grinders, hedge trimmers, and grooving machines. For example, in this embodiment, when applied to an angle grinder, the housing 1 includes a motor housing 2 and a head housing 3. The head housing 3 is connected to the front end of the motor housing 2, and the handle 5 is rotatably connected to the rear end of the motor housing 2. The rear end of the motor housing 2 has a connecting part 24 for connecting to the handle 5. The power mechanism includes a drive motor 11 installed in the motor housing 2, an output shaft 13 disposed on the head housing 3, and a connecting... The gear set between the output shaft 13 and the drive motor 11 is housed in the head housing 3. The gear set includes a meshing driving bevel gear 12 and a driven bevel gear 14. The driving bevel gear 12 is connected to the motor shaft of the drive motor 11, and the driven bevel gear 14 is connected to the output shaft 13. The working head 4 is a grinding disc mounted on the output shaft 13. When the drive motor 11 starts, the gear set receives the power output by the drive motor 11 and transmits it to the output shaft 13. The output shaft 13 drives the grinding disc to rotate for grinding.

[0078] The handle 5 has three angular positions relative to the motor housing 2: 0°, 90°, and -90°. When it is in the 0° position, the grinding disc faces downwards when the handle 5 is held upright. When the handle 5 is rotated 90° clockwise relative to the motor housing 2, the handle 5 is in the 90° position, and the grinding disc faces right when the handle 5 is held upright. When the handle 5 is rotated 90° counterclockwise relative to the motor housing 2, the handle 5 is in the -90° position, and the grinding disc faces left when the handle 5 is held upright. By changing the relative angle of the handle 5 to the housing 1, the angle grinder can be adapted to use in different work positions or at different angles.

[0079] The foregoing description of the handheld power tool with a rotating handle provided by the present invention has illustrated the principles and implementation methods of the invention through specific examples. The descriptions of these embodiments are merely for the purpose of aiding understanding the invention and its core concepts. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A hand-held electric power tool with a rotating handle, comprising a housing, a handle, a working head, a power mechanism and a locking mechanism, the housing is provided with a cylindrical connecting part, a circular track groove for the rotation of the handle is arranged on the circumferential side wall of the connecting part, the end of the handle is provided with an opening for the insertion of the connecting part, an inner ring edge for the sliding fit of the circular track groove is arranged on the inner wall of the handle, the handle is rotatably connected to the housing through the sliding fit of the inner ring edge and the circular track groove, the locking mechanism is used for locking the relative rotation of the handle and the housing, the power mechanism is accommodated in the housing, and the working head is connected with the power mechanism, characterized in that, The locking mechanism includes a slidable locking member mounted on the handle and a second elastic member installed between the locking member and the handle. The end face of the connecting part has at least two locking grooves. The locking member is inserted into one of the locking grooves to lock the relative rotation of the handle and the housing. Moving the locking member to one side disengages it from the locking groove, thereby releasing the lock between the handle and the housing. At least one tensioning mechanism is provided between the connecting part and the handle. The tensioning mechanism includes a support member and a first elastic member acting on the support member to provide elastic support. The support member and the first elastic member support the handle and the connecting part, keeping the rotational connection between the handle and the connecting part in a tensioned state to eliminate any wobbling gaps. The handle is provided with a first receiving portion for accommodating the top support member and the first elastic member. The first elastic member is supported between the top support member and the handle. When the locking member rotates to be opposite to one of the locking slots, the top support member rotates to be opposite to one of the remaining locking slots, and the top support member abuts against the locking slot for support. The locking component includes a main body, and the handle has a second receiving portion for accommodating the main body to slide within it. The main body has a locking pin and a push plate that engage with a locking groove. The push plate extends outside the handle for pushing and pulling by hand, and the handle has a movable opening for the push plate to extend out. The end face of the connecting part is provided with a through hole communicating with the inside of the housing. The inner wall of the through hole is provided with a protrusion, the number of which is the same as the number of locking grooves. The locking grooves are provided on the protrusions. Adjacent protrusions are connected by arc-shaped connecting ribs. The connecting ribs are combined to form an annular ring coaxial with the connecting part. The annular ring is provided with a circular bearing seat coaxial with the connecting part. The bearing seat is integrally formed with multiple circumferentially distributed connecting beams. Any connecting beam extends radially outward along the bearing seat to the inner wall of the connecting rib or the protrusion. A fan-shaped hole is formed between two adjacent connecting beams. The outer wall of the connecting rib is provided with a supporting rib extending to the inner wall of the through hole.

2. The handheld power tool with a rotary handle according to claim 1, characterized in that, The connecting part has two annular track grooves on its circumferential sidewall, which are separated by an annular spacer. The handle has two inner ring edges that slide with the two annular track grooves respectively. The annular spacer edge has two spaced first limiting blocks. The handle has a second limiting block located between the two inner ring edges. The second limiting block is inserted between the two first limiting blocks, and a space is formed between the two first limiting blocks for the second limiting block to slide relative to each other.

3. The handheld power tool with a rotary handle according to claim 1, characterized in that, The top support is a sphere, a ball head, or a tapered pin, and the groove of the locking slot is provided with a flared opening with a taper or arc, and the top support abuts against the flared opening.

4. The handheld power tool with a rotary handle according to claim 1, characterized in that, The housing has a circular protrusion, and a first step is formed between the protrusion and the housing. The connecting part is set on the end face of the protrusion. The connecting part and the protrusion have different diameters and a second step is formed between them. The handle has a protruding collar on the end face with an opening, and the collar is fitted around the outside of the protrusion.

5. The handheld power tool with a rotary handle according to claim 1, characterized in that, The main body is provided with a front baffle plate located in front of the push plate and a rear baffle plate located behind the push plate. The second receiving part is provided with a first sliding groove that slides with the front baffle plate and a second sliding groove that slides with the rear baffle plate on both sides. When the push plate is subjected to a backward pushing force, the main body and the locking pin move backward, causing the locking pin to disengage from the locking groove, and the front cover plate moves to the movable opening to form a cover. When the push plate loses force, the second elastic element pushes the main body and the locking pin forward, causing the locking pin to insert into the corresponding locking groove, and the rear baffle moves to the movable opening to form a blockage.

6. The handheld power tool with a rotary handle according to claim 1, characterized in that, The lock slots are provided in four rows, arranged in a ring around the axis of the connecting part on the end face of the connecting part. The tensioning mechanism is provided in one set, and the tensioning mechanism and the locking mechanism are located symmetrically on both sides of the rotation axis of the handle. A third step is provided between the locking pin and the main body. When the locking pin is inserted into the lock slot, the third step rests on the end face of the connecting part. The handle is provided with two mounting platforms. The first accommodating part and the second accommodating part are respectively set on the two mounting platforms. The end faces of the two mounting platforms opposite to the connecting part are respectively provided with protrusions for the locking member and the top support member to extend out.

7. The handheld power tool with a rotary handle according to claim 1 or 6, characterized in that, The direction of the force exerted by the first elastic element between the handle and the top support is parallel to the rotation axis of the handle, and the sliding direction of the locking element relative to the handle is parallel to the rotation axis of the handle.

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