Angle grinder

Abstract

The utility model relates to an angle grinder which comprises a shell, a motor assembly contained in the shell and a driving gear set connected to the motor assembly and used for applying torque to a main shaft, a main shaft locking device is arranged between the driving gear set and the main shaft in a matched mode, and the main shaft locking device comprises a pressing mechanism for a user to apply force and a locking mechanism connected to the pressing mechanism. The pressing mechanism drives the locking mechanism to move so that the locking mechanism and the driving gear set can be combined and / or separated, the pressing mechanism comprises a pressing body, a cover turning element connected to the pressing body and a connecting rod element arranged between the pressing body and the cover turning element in a penetrating mode, and the cover turning element pivots through the connecting rod element.

Description

[Technical Field]

[0001] The utility model relates to the technical field of power tools, and particularly relates to an angle grinder with a spindle locking device. [Background Art]

[0002] An angle grinder is a power tool that uses a motor assembly as a power source to drive a driving gear set to drive a top tool (grinding disc or cutting disc) for grinding operations. To adapt to different working environments, the angle grinder needs to have the ability to quickly replace the top tool. Based on this, the existing angle grinders often have a spindle locking device composed of a pressing mechanism (lock nut) and a locking mechanism (lock pin) arranged between the gearbox and the spindle. The user can apply force to the pressing mechanism to engage the locking mechanism with the driving gear set, thereby achieving the stopping rotation of the driving gear set and the spindle.

[0003] Furthermore, a large amount of dust will be generated during the long-term operation of the angle grinder. These dusts will float in the air and accumulate in the accommodation groove on the gearbox for accommodating the pressing mechanism. If the user wants to clean the dust, the pressing mechanism must be removed from the locking mechanism. However, due to assembly and process requirements, the pressing mechanism and the locking mechanism are often connected by interference fit, and it is quite laborious to separate the two, resulting in a poor user experience.

[0004] In view of this, it is necessary to provide an improved angle grinder to overcome the defects existing in the prior art. [Content of the Utility Model]

[0005] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide an angle grinder with a spindle locking device. The spindle locking device can facilitate the user to clean the dust at the gearbox, which is beneficial to improving the user experience.

[0006] The utility model solves the problems of the prior art by adopting the following technical solutions: An angle grinder includes a housing, a motor assembly housed in the housing, and a driving gear set engaged with the motor assembly and applying torque to a spindle. The driving gear set is provided with a spindle locking device. The spindle locking device includes a pressing mechanism for the user to apply force and a locking mechanism connected to the pressing mechanism. The pressing mechanism drives the locking mechanism to move, so that the locking mechanism engages or disengages with the driving gear set. The pressing mechanism includes a pressing body, a flip element connected to the pressing body, and a connecting rod element passing through the pressing body and the flip element. The flip element pivots relative to the pressing body via the connecting rod element.

[0007] A further improvement solution is as follows: The pressing body includes a base and a pair of first openings formed on the circumferential end face of the base and communicating with each other. The flip cover element has a pair of second openings penetrating the circumferential end face. The link element is inserted through the first opening and the second opening.

[0008] A further improvement solution is as follows: The pressing body includes a side ring covering the circumferential end face of the base. The side ring has side ring fixing faces formed at both circumferential ends and fixing grooves recessed from the side ring fixing faces. The flip cover element has flip cover fixing faces formed at both circumferential ends and buckles protruding from the flip cover fixing faces. The buckles are buckled in the fixing grooves.

[0009] A further improvement solution is as follows: The base has a base mounting face connected between the pair of side ring fixing faces. The first opening is provided on the base mounting face.

[0010] A further improvement solution is as follows: The flip cover element has a base ring extending in an arc shape and ribs extending from the circumferential end face of the base ring towards the pressing body. The ribs abut against the base mounting face, and the first opening and the second opening coincide.

[0011] A further improvement solution is as follows: The flip cover element has an extension portion extending from the axial end face of the base ring. The extension portion is radially spaced apart from the base mounting face.

[0012] A further improvement solution is as follows: The second opening penetrates the rib and the extension portion.

[0013] A further improvement solution is as follows: The pressing mechanism has a first connecting portion extending from the axial end face of the base. The locking mechanism includes a locking pin and a second connecting portion formed at the end of the locking pin. The second connecting portion is inserted through the first connecting portion and the base.

[0014] A further improvement solution is as follows: The main shaft locking device has an elastic mechanism that biases the pressing mechanism. The elastic mechanism is sleeved on the locking mechanism and the first connecting portion.

[0015] A further improvement solution is as follows: The drive gear set has a first bevel gear connected to the motor assembly and a second bevel gear driven by the first bevel gear. A positioning groove for inserting the locking pin is provided on the surface of the second bevel gear.

[0016] Compared with the prior art, the utility model has the following beneficial effects: The spindle locking mechanism pivotally connects the flip element of the pressing mechanism to the pressing body through a connecting rod element, enabling the user to only rotate the flip element when cleaning the dust at the gearbox, which is convenient to operate and provides a good experience; only the first opening and the second opening need to be respectively provided on the pressing body and the flip element to achieve connection through the connecting rod element, with a compact structure and simple manufacturing; the circumferential ends of the pressing body and the flip element are respectively provided with a cooperating buckle and a fixing groove, which can maintain the stability of their connection when the flip cover is not rotated, thus ensuring the comfort of the user's operation. [Description of the Drawings]

[0017] The following further elaborates on the specific implementation manners of the utility model with reference to the drawings:

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

[0019] Figure 2 is Figure 1 the sectional view of the angle grinder shown;

[0020] Figure 3 is Figure 2 the assembly schematic diagram of the pressing mechanism and the gearbox of the spindle locking device in the angle grinder shown;

[0021] Figure 4 is Figure 2 the enlarged view of the spindle locking device in the angle grinder shown;

[0022] Figure 5 is Figure 4 the exploded schematic diagram of the spindle locking device shown;

[0023] Figure 6 is Figure 5 the enlarged view of the pressing mechanism in the spindle locking device shown;

[0024] Figure 7 is Figure 6 the structural schematic diagram of the flip element in the pressing mechanism shown;

[0025] Figure 8 is Figure 3 the pivoting schematic diagram of the flip element relative to the pressing body in the spindle locking device shown;

[0026] Figure 9 is Figure 4 the sectional view of the spindle locking device in the pivoted state of the flip element shown.

[0027] The meanings of the reference numerals in the drawings:

[0028] Angle grinder 100, housing 1

[0029] Cylindrical part 11, handle part 12

[0030] Air inlet 121, gearbox 13

[0031] Air outlet 131, accommodation groove 132

[0032] Receiving hole 133, transmission component 2

[0033] Drive gear set 21, second bevel gear 211

[0034] Positioning groove 211a, main shaft 22

[0035] Top tool 3, upper pressing plate 31

[0036] Lower pressing plate 32, protective cover 4

[0037] Main shaft locking device 5, pressing mechanism 51

[0038] First connecting part 51a, pressing body 511

[0039] Base 511a, side ring 511b

[0040] Pressing surface 511c, base mounting surface 511d

[0041] First opening 511e, side ring fixing surface 511f

[0042] Fixing groove 511g, flip element 512

[0043] Base ring 512a, convex rib 512b

[0044] Extension part 512c, flip fixing surface 512d

[0045] Snap 512e, second opening 512f

[0046] Avoidance area 512g, connecting rod element 513

[0047] Locking mechanism 52, locking pin 521

[0048] Second connecting part 522, elastic mechanism 53 [Detailed implementation manner]

[0049] The terms used in the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. For example, the words indicating orientation or positional relationship such as "upper", "lower", "front", "rear", etc. are only based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0050] Please refer to Figure 1 and Figure 2 , an embodiment of the present utility model relates to an angle grinder 100 for grinding and cutting workpieces such as metals and stones. The housing 1 of the angle grinder 100 has a three-section structure, including a cylindrical portion 11 for housing a motor assembly (not shown), a handle portion 12 for the user to hold, and a gearbox 13 for housing a transmission assembly 2. The motor assembly can drive the transmission assembly 2 to operate so as to drive a top tool 3 at the lower end of the gearbox 13 to operate on the workpiece. The top tool 3 can be a cutting disc or a grinding disc, and is fixed to the main shaft 22 through an upper pressing plate 31 and a lower pressing plate 32.

[0051] Please continue to refer to Figure 1 and Figure 2 , the transmission assembly 2 of the angle grinder 100 has a driving gear set 21 for transmitting the torque of the motor assembly to the main shaft 22. The driving gear set 21 includes a first bevel gear connected to the motor assembly and a second bevel gear 211 sleeved on the outside of the main shaft 22 and meshing with the first bevel gear. The first bevel gear can drive the second bevel gear 211 and the main shaft 22 to rotate synchronously. At the same time, a large amount of heat will be generated during the operation of the motor assembly and the transmission assembly 2. If these heats are not discharged in time, it will inevitably cause damage to the machine. Therefore, a pair of air inlets 121 are provided at the front and rear ends of the handle portion 12, and an air outlet 131 is provided on the left side of the gearbox 13. When the motor assembly rotates, a fan (not shown) will suck the cooling air flow outside the machine from the air inlet holes 121, then flow through the motor assembly and the transmission assembly 2, and finally flow out from the air outlet 131, thereby completing the heat dissipation of the angle grinder 100.

[0052] If the angle grinder 100 operates under incorrect conditions, there may be a risk of rupture of the top tool 3. If the broken metal fragments fly onto the user, it is easy to cause harm to the user. Therefore, a protective cover 4 needs to be provided on the outside of the top tool 3. The protective cover 3 is preferably a quick-change type, so that the user does not need tools when replacing the protective cover 4, and the operation is simple and time-saving.

[0053] Since the angle grinder 100 has two operating modes of cutting and grinding, and different types of top tools 3 need to be replaced for the angle grinder 100 in different operating modes, a spindle locking device 5 is provided in this embodiment to achieve quick replacement of the top tool 3. Please refer to Figures 2 to 5 , the spindle locking device 5 includes a disc-shaped pressing mechanism 51 and a locking mechanism 52 connected to the pressing mechanism 51. Specifically, a first connecting portion 51a extends downward from the axial end face of the pressing mechanism 51. The first connecting portion 51a is a hollow column. The locking mechanism 52 includes a locking pin 521 and a second connecting portion 522 formed at the upper end of the locking pin 521. The second connecting portion 522 is inserted into the first connecting portion 51a, and the two are in interference fit.

[0054] The installation of the spindle locking device 5 is described as follows: The gearbox 13 is provided with an accommodating groove 132 and a receiving hole 133 that communicate with each other at the lower end of the air outlet 131. The inner diameter of the accommodating groove 132 is larger than that of the receiving hole 133, and the receiving hole 133 penetrates through the gearbox 13. When placing the spindle locking device 5 into the gearbox 13, the locking mechanism 52 can be first aligned with the receiving hole 133 and inserted from the lower end of the gearbox 13 and exposed from the accommodating groove 132. Subsequently, the elastic mechanism 53 can be sleeved on the outer periphery of the locking mechanism 52 and the elastic mechanism 53 is respectively abutted against the pressing mechanism 51 and the accommodating groove 132. Finally, the pressing mechanism 51 can be installed on the locking mechanism 52. In this embodiment, the elastic mechanism 53 is preferably a compression spring.

[0055] In the state where the top tool 3 does not need to be replaced, the elastic mechanism 53 is in a natural state to bias the pressing mechanism 51 so that the pressing mechanism 51 obtains a pre-tightening force. If the user wants to replace the top tool 3, the pressing mechanism 51 can be pressed to move the locking mechanism 52 downward. When the locking pin 521 engages with the positioning groove 211a on the second bevel gear 211, the second bevel gear 211 can no longer drive the spindle 22 to rotate, and the user can replace the top tool 3 with one hand, avoiding the cumbersome and laborious process of replacing the top tool 3 with both hands.

[0056] Since the dust generated by the grinding operation of the angle grinder 100 will disperse in the air, which causes more dust to accumulate in the accommodating groove 132 after a certain period of time. To clean this dust, the pressing mechanism 51 in this embodiment is designed as follows. Please refer to Figures 2 to 7:The pressing mechanism 51 consists of a pressing main body 511 and a flip cover element 512, which are connected by a connecting rod element 513. The flip cover element 512 can pivot relative to the pressing main body 511 through the connecting rod element 513. The pressing main body 511 includes a substantially disc-shaped base 511a and a side ring 511b extending downward from the circumferential end face at the left end. The side ring 511b is not a complete ring and has a notch for accommodating the flip cover element 512 formed in the rear side direction. That is to say, the side ring 511b covers a part of the circumferential end face of the base 511a.

[0057] Turn to Figures 5 to 7 , a pressing surface 511c for the user to apply force and a base mounting surface 511d for fixing the connecting rod element 513 are respectively formed on the upper side and the rear side of the base 511a. A pair of first openings 511e are provided on the base mounting surface 511d, and the connecting rod element 513 passes through them. The end face of the side ring 511b at the notch forms a pair of side ring fixing surfaces 511f. The base mounting surface 511d is provided between the two side ring fixing surfaces 511f and is connected to the side ring fixing surfaces 511f. The side fixing surface 511f is penetrated by a fixing groove 511g.

[0058] The flip cover element 512 extends in an arc shape and includes a base ring 512a, a convex rib 512b extending from the front side end face of the base ring 512a, and an extension part 512c protruding from the upper side surface of the base ring 512a. A pair of second openings 512f penetrate the flip cover element 512 in the front-rear direction. The upper half of the second opening 512f is located in the extension part 512c, and the lower half is located in the convex rib 512b. A pair of flip cover fixing surfaces 512d are formed at the circumferential two ends of the base ring 512a, and a buckle 512e is provided on each flip cover fixing surface 512d.

[0059] When connecting the flip cover element 512 to the pressing main body 511, the first opening 511e and the second opening 512f can be made to coincide, and then the connecting rod element 513 can be inserted into the first opening 511e and the second opening 512f. When there is no relative rotation between the flip cover element 512 and the pressing main body 511, the convex rib 512b abuts against the base mounting surface 511d, and the buckle 512e can be fastened in the fixing groove 511g. It should be noted that a certain gap needs to be left between the extension part 512c and the base mounting surface 511d. This gap is defined as an avoidance area 512g. The function of the avoidance area 512g is to enable the flip cover element 512 not to be hindered by the base mounting surface 511d when rotating; combined with Figure 8 and Figure 9 , when the user flips the flip cover element 512, the user can directly apply force with a finger to the flip cover element 512 to make it rotate. The rotation of the flip cover element 512 also creates a passage between the accommodating groove 132 and the outside. At this time, the user only needs to invert the angle grinder 100 and pour out the dust in the accommodating groove 132.

[0060] The present utility model is not limited to the above specific embodiments. It can be easily understood by those of ordinary skill in the art that, without departing from the principles and scope of the present utility model, there are many alternative solutions for the angle grinder of the present utility model. The protection scope of the present utility model shall be subject to the content of the claims.

Claims

1. An angle grinder, comprising a housing, a motor assembly received in the housing, and a drive gear set engaged with the motor assembly and applying torque to a spindle, wherein the drive gear set is provided with a spindle locking device, the spindle locking device includes a pressing mechanism for a user to apply force and a locking mechanism connected to the pressing mechanism, the pressing mechanism drives the locking mechanism to move so that the locking mechanism engages or disengages from the drive gear set; characterized in that: The pressing mechanism includes a pressing main body, a flip element connected to the pressing main body, and a connecting rod element passing through between the pressing main body and the flip element. The flip element pivots relative to the pressing main body via the connecting rod element.

2. The angle grinder according to claim 1, characterized in that: The pressing main body includes a base and a pair of first openings formed on the circumferential end face of the base and communicating with each other. The flip element has a pair of second openings penetrating the circumferential end face. The connecting rod element passes through the first openings and the second openings.

3. The angle grinder according to claim 2, wherein: The pressing main body includes a side ring covering the circumferential end face of the base. The side ring has side ring fixing surfaces formed at both circumferential ends and fixing grooves recessed from the side ring fixing surfaces. The flip element has flip fixing surfaces formed at both circumferential ends and buckles protruding from the flip fixing surfaces. The buckles are buckled in the fixing grooves.

4. The angle grinder according to claim 3, wherein: The base has a base mounting surface connected between a pair of the side ring fixing surfaces. The first openings are provided on the base mounting surface.

5. The angle grinder according to claim 4, characterized in that: The flip element has a base ring extending in an arc shape and rib protrusions extending from the circumferential end face of the base ring toward the pressing main body. The rib protrusions abut against the base mounting surface, and the first openings and the second openings coincide.

6. The angle grinder according to claim 5, characterized in that: The flip element has an extension portion extending from the axial end face of the base ring. The extension portion is radially spaced apart from the base mounting surface.

7. The angle grinder according to claim 6, characterized in that: The second openings penetrate the rib protrusions and the extension portion.

8. The angle grinder according to claim 2, characterized in that: The pressing mechanism has a first connecting portion extending from the axial end face of the base. The locking mechanism includes a locking pin and a second connecting portion formed at the end of the locking pin. The second connecting portion passes through the first connecting portion and the base.

9. The angle grinder according to claim 8, characterized in that: The main shaft locking device has an elastic mechanism biasing the pressing mechanism. The elastic mechanism is sleeved on the locking mechanism and the first connecting portion.

10. The angle grinder according to claim 9, wherein: The drive gear set has a first bevel gear connected to the motor assembly and a second bevel gear driven by the first bevel gear. A positioning groove for inserting the locking pin is provided on the surface of the second bevel gear.

Images