CN204621741U - Power tool - Google Patents
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- CN204621741U CN204621741U CN201520001650.8U CN201520001650U CN204621741U CN 204621741 U CN204621741 U CN 204621741U CN 201520001650 U CN201520001650 U CN 201520001650U CN 204621741 U CN204621741 U CN 204621741U
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- output shaft
- power tool
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- locking
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- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 208000012260 Accidental injury Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a kind of power tool, comprise housing, the motor be contained in described housing, to be driven the output shaft of pivotable by motor, for working head being locked at retaining mechanism on described output shaft, being operationally connected with described retaining mechanism and driving the driving mechanism of described retaining mechanism, described power tool also comprises the output shaft arrestment mechanism for being fixed by relatively described for described output shaft housing, and described driving mechanism is connected with described output shaft arrestment mechanism.Power tool of the present utility model comprises the output shaft arrestment mechanism for being fixed by relative for output shaft housing, and thus, power tool is when changing working head, and output shaft can not move, thus makes to change the more convenient to operate of working head.
Description
Technical Field
The utility model relates to a power tool, especially a power tool with working head locking mechanism and output shaft arrestment mechanism.
Background
Chinese published patent application CN 102896619a (published: 2013.01.30) discloses a power tool, which comprises a working head locking mechanism and a driving mechanism for driving the working head locking mechanism, wherein the working head locking mechanism comprises a locking member and a locking member which are in threaded connection, and when the driving mechanism rotates along a first direction, the locking member and the locking member are driven to lock through threads so as to fix a working head on an output shaft; when the driving mechanism rotates along the second direction, the locking piece and the locking piece are driven to be loosened, so that the working head can be taken down from the output shaft and replaced by another working head, and therefore the working head can be replaced and clamped without using additional auxiliary tools such as a wrench and the like.
However, when the working head of the power tool is replaced, the output shaft may rotate due to the locking member, and the operation of fixing the working head to the output shaft is difficult due to the rotating output shaft.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the problem of providing a power tool which is more convenient to use.
In order to solve the above problem, the technical scheme of the utility model is that:
a power tool comprises a shell, a motor contained in the shell, an output shaft driven by the motor to pivot, a locking mechanism used for locking a working head on the output shaft, and a driving mechanism which is operably connected with the locking mechanism and drives the locking mechanism, and further comprises an output shaft braking mechanism used for fixing the output shaft relative to the shell, wherein the driving mechanism is connected with the output shaft braking mechanism.
Preferably, the drive mechanism includes an operating assembly and a drive assembly connected to the operating assembly, the operating assembly being operable to move the drive assembly into and out of engagement with the locking mechanism.
Preferably, the output shaft braking mechanism includes a braking member fixed axially relative to the drive assembly, the operating assembly being operable to move the braking member into abutment with the output shaft to lock the output shaft.
Preferably, the direction in which the braking member moves is the axial extension direction of the output shaft.
Preferably, an elastic member is provided between the braking member and the housing, and the elastic force provided by the elastic member urges the braking member to have a tendency to move in a direction to lock the output shaft.
Preferably, a transmission mechanism is arranged on the output shaft and comprises a gear, and the braking member abuts against the gear to lock the gear so as to lock the output shaft.
Preferably, the power tool further comprises a switch for activating the motor, a trigger stop moveable into and out of abutment with the switch, the operating assembly being operable to drive the trigger stop out of engagement with the switch.
Preferably, the trigger stop is pivotably arranged on the housing.
Preferably, the axis of pivoting of the trigger stop is perpendicular to the axis of the output shaft.
Preferably, the power tool further comprises a biasing member that urges the trigger stopper to have a tendency to move in a direction of abutting against the switch.
Preferably, the power tool is an angle grinder.
Compared with the prior art, the utility model discloses a power tool is including being used for the output shaft arrestment mechanism fixed with the relative casing of output shaft, from this, power tool is when changing the working head, and the output shaft can not move to it is more convenient to make the operation of changing the working head.
Drawings
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is a perspective view of a power tool according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the power tool shown in FIG. 1, with the working head secured to the output shaft;
fig. 3 is a cross-sectional view of the power tool of fig. 1 with the output shaft locked and the working head removed and replaced.
Wherein,
100 power tool 38 latch 58 drive
20 case 40 locker 60 push rod part
22 motor 42 rod-shaped main body 62 groove
24 output shaft 44 pressure plate 64 connecting part
26 working head 46 flange 66 cylindrical cavity
28 motor shaft 48 nut portion 68 elastic member
30 first gear 50 recess 70 pivot
32 second gear 52 drive mechanism 72 cam portion
34 locking mechanism 54 drive assembly 74 handle portion
36 socket 56 operating assembly 76 snap
78 brake 80 switch 82 triggers a stop
Detailed Description
Referring to fig. 1 and 2, the power tool 100 of the present embodiment includes a housing 20, a motor 22 accommodated in the housing 20, and an output shaft 24 driven by the motor 22 to pivot, and the working head 26 can be fixed on the output shaft 24 to move synchronously with the output shaft 24 so as to machine a workpiece.
The power tool 100 of the present embodiment is an angle grinder, and the motor 22 drives the output shaft 24 to rotate through a transmission mechanism. The transmission is a gear transmission comprising a first gear 30 arranged on the motor shaft 28, a second gear 32 meshing with the first gear 30. The output shaft 24 is a central shaft of the second gear 32, and the output shaft 24 and the second gear 32 are fixed relatively. The working head 26 is a circular abrasive disc which rotates with the output shaft 24 to polish or cut a workpiece.
In this embodiment, the gear transmission mechanism is a bevel gear transmission mechanism, and the bevel gear transmission mechanism can make the output shaft 24 and the motor shaft 28 perpendicular to each other, and it can be understood by those skilled in the art that, in addition to the bevel gear transmission mechanism driving the output shaft 24 to rotate, other transmission mechanisms can also drive the output shaft 24 to rotate, and different transmission mechanisms can make the output shaft 24 and the motor shaft 28 form different angles.
It will be appreciated by those skilled in the art that the power tool may also be a swing machine, with the motor driving the output shaft to swing through an eccentric transmission. Different working heads such as a saw blade, a sanding plate, a polishing disc and the like are fixed on the output shaft and can cut, polish and polish workpieces along with the swing of the output shaft. All technical solutions similar to the present embodiment should be covered in the protection scope of the present invention.
In this embodiment, the power tool 100 includes a locking mechanism 34 that locks the working head 26 to the output shaft 24.
Specifically, the output shaft 24 is provided with a receiving portion 36 extending out of the housing 20, and the locking mechanism 34 includes a locking member 38 for fixing the working head 26 on the receiving portion 36 of the output shaft 24, and a locking member 40 supported on an end of the output shaft 24 away from the receiving portion 36 and for locking the locking member 38. The locking member 38 and the locking member 40 may be threadably engaged. After the locking member 38 and the locking member 40 are brought into contact, the locking member 40 is rotated to threadedly engage the locking member 40 and the locking member 38, thereby securing the working head 26 to the output shaft 24.
In this embodiment, the locking member 38 is in the shape of a screw and includes a rod-shaped main body 42 extending lengthwise, a pressing plate 44 is fixedly disposed at one end of the rod-shaped main body 42, and an external thread is disposed at the other end of the rod-shaped main body 42. The pressure plate 44 can cooperate with the bolster 36 to clamp the working head 26 between the pressure plate 44 and the bolster 36. In this embodiment, for easier machining and assembly, the power tool 100 further includes a flange 46 having a larger cross-sectional area than the pressing plate 44 in a plane perpendicular to the rod-shaped body 42, and when the working head 26 is locked, the flange 46 is placed between the working head 26 and the pressing plate 44, the pressing plate 44 presses the flange 46 toward the receiving portion 36, and the flange 46 presses the working head 26 toward the receiving portion 36.
The locking member 40 includes a nut portion 48, and the nut portion 48 is provided with an internal thread. The nut portion 48 abuts on one end of the output shaft 24 remote from the socket portion 36. The output shaft 24 is hollow inside, and the locking member 38 passes through the hollow inside of the output shaft 24 and is screwed with the internal thread of the nut portion 48, thereby locking the working head 26 to the output shaft 24.
In the preferred embodiment, the locking member 38, the locking member 40 and the output shaft 24 are coaxially arranged, and have regular structure and reasonable layout.
In this embodiment, the side of the second gear 32 away from the receiving portion 36 of the output shaft 24 is provided with an annular recessed portion 50, the radial dimension of the nut portion 48 is smaller than the radial dimension of the recessed portion 50, and the nut portion 48 is partially received in the recessed portion 50 and is coaxially arranged with the recessed portion 50, so that the structural layout is reasonable, and the volume of the power tool 100 can be reduced.
The power tool 100 of this embodiment further includes a drive mechanism operatively coupled to the locking mechanism 34 and driving the locking mechanism 34, the drive mechanism including a drive assembly 54 and an operating assembly 56 coupled to the drive assembly 54, the operating assembly 56 being operative to move the drive assembly 54 into and out of engagement with the locking mechanism 34. Specifically, actuating assembly 54 can be moved into and out of engagement with retaining member 40 of locking mechanism 34, and actuating assembly 54 can be moved into engagement with retaining member 40 to rotate retaining member 40 to lock retaining member 40 and locking member 38.
The driving assembly 54 includes a driving portion 58 and a push rod portion 60 connected in series, the driving portion 58 being adjacent to the locking member 40 relative to the push rod portion 60.
The driving portion 58 has a groove 62 axially opened from the bottom, and the locking member 40 includes a connecting portion 64 capable of circumferentially and fixedly mating with the groove 62, wherein the connecting portion 64 is fixedly connected with the nut portion 48. Preferably, the connecting portion 64 and the nut portion 48 are integrally formed. When driving portion 58 is moved toward locking member 40, recess 62 is mated with and circumferentially fixed to coupling portion 64. Circumferentially fixed means that the recess 62 and the connecting portion 64 are connected and cannot rotate relative to each other, so that the driving portion 58 and the connecting portion 64 cannot rotate relative to each other, and the driving portion 58 rotates to drive the connecting portion 64 and the nut portion 48 to rotate, so that the locking member 40 rotates to be screwed with the locking member 38. The circumferentially fixed structure between the groove 62 and the connecting portion 64 may be axially extending and mutually engageable teeth provided on the groove 62 and the connecting portion 64, respectively.
In the present embodiment, the driving portion 58 is preferably cylindrical and is provided coaxially with the coupling portion 64, the nut portion 48, and the output shaft 24. The drive portion 58 moves in the axial extending direction of the output shaft 24 to engage or disengage with the connecting portion 64.
The push rod portion 60 is fixedly connected to the drive portion 58, preferably integrally formed therewith. In this embodiment, a cylindrical cavity 66 is provided inside the housing 20 on a side of the second gear 32 away from the bearing portion 36 of the output shaft 24, an opening 67 is provided on the housing 20 at a position facing the cylindrical cavity 66, and the push rod portion 60 passes through the opening 67, so that a part of the push rod portion 60 and the driving portion 58 are accommodated in the cylindrical cavity 66, and dust accumulation can be prevented from affecting the matching accuracy of the driving portion 58 and the connecting portion 64. The pushing rod part 60 is cylindrical, the opening 67 is circular, the pushing rod part 60 can rotate in the opening 67, the pushing rod part 60 rotates to drive the driving part 58 to rotate, and the driving part 58 rotates to drive the locking part 40 to rotate and lock the locking part 38 with threads.
In the present embodiment, the driving portion 58 and the pushing rod portion 60 are preferably coaxially disposed, and more preferably, the driving portion 58, the pushing rod portion 60 and the output shaft 24 are coaxially disposed, so that the structure is regular and the layout is reasonable.
In the present embodiment, the radial dimension of the driving portion 58 is larger than that of the push rod portion 60, so that an annular step portion is formed on the end surface of the driving portion 58 close to the push rod portion 60, an elastic member 68 is disposed between the annular step portion and the inner surface of the housing 20, and the elastic force provided by the elastic member 68 urges the driving portion 58 to have a tendency to move toward the connecting portion 64.
A pivot 70 is fixedly mounted to an end of the push rod portion 60 remote from the drive portion 58. The axis of the pivot 70 is perpendicular to the axis of the output shaft 24, and preferably, the axis of the pivot 70 and the axis of the output shaft 24 are coplanar.
The operating assembly 56 includes a cam portion 72 pivotally coupled to the pusher portion 60 by a pivot 70, and rotation of the cam portion 72 about the pivot 70 moves the drive assembly 54 in the axial direction of the output shaft 24 to engage or disengage the drive assembly 54 with the locking mechanism 34. Specifically, the cam portion 72 is provided with a cam surface abutting against the outer surface of the housing 20, and the cam surface has a high level surface far away from the pivot 70 and a low level surface close to the pivot 70, as shown in fig. 2, when the high level surface abuts against the outer surface of the housing 20, the cam portion 72 drives the driving assembly 54 to be far away from the locking mechanism 34; as shown in fig. 3, when the lower surface abuts the outer surface of the housing 20, the cam portion 72 brings the driving assembly 54 close to the locking mechanism 34.
Operating assembly 56 further includes a handle portion 74 connected to cam portion 72, and preferably, handle portion 74 and cam portion 72 are integrally formed. The handle portion 74 extends lengthwise to facilitate movement of the drive assembly 54 into and out of engagement with the locking mechanism 34 by controlling the handle portion 74 to rotate the cam portion 72 about the pivot 70. The operator can also control the handle portion 74 to rotate the cam portion 72 and the driving assembly 54 about the axis of the shaft portion 60, and when the driving portion 58 of the driving assembly 54 engages with the connecting portion 64 of the locking member 40, the handle portion 74 rotates the cam portion 72, the driving assembly 54 and the locking member 40 about the axis of the shaft portion 60, so that the locking member 40 is threadedly locked with the locking member 38.
Referring to fig. 1 and 2, the housing 20 is provided with an elastic clip 76 for clipping the handle portion 74. When the handle portion 74 moves the driving assembly 54 away from the locking mechanism 34, the handle portion 74 engages the elastic clip 76 to fix the operating assembly 56 relative to the housing 20.
The operation of the power tool 100 of the present embodiment to lock the working head 26 is described below.
First, the working head 26 is brought into contact with the receiving portion 36 of the output shaft 24, the flange 46 is brought into contact with the end face of the working head 26 remote from the receiving portion 36, and the rod-like body 42 of the locking member 38 is inserted into the nut portion 48 of the locking member 40 through the central openings of the flange 46, the working head 26, and the output shaft 24 in this order.
Next, referring to the state change of fig. 2 to 3, the handle portion 74 is operated to pivot the cam portion 72 about the pivot 70, in this embodiment, counterclockwise, the low surface of the cam surface abuts against the housing 20, the driving unit 54 moves axially close to the locking member 40, and the elastic member 68 further urges the driving unit 54 to move toward the locking member 40, so that the driving portion 58 of the driving unit 54 is close to the connecting portion 64 of the locking member 40 and finally is fixedly connected with the connecting portion 64 in the circumferential direction.
Subsequently, the handle portion 74 is operated to rotate the cam portion 72 about the axis of the push rod portion 60, the cam portion 72 is rotated to rotate the push rod portion 60, the driving portion 58, the connecting portion 64, and the nut portion 48 in turn, and the nut portion 48 is rotated to screw-lock the locking member 38 inserted into the nut portion 48, thereby fixing the working head 26 placed between the locking member 38 and the receiving portion 36 of the output shaft 24 to the output shaft 24.
Finally, referring to the change of state of fig. 3-2, the operating handle causes the cam portion 72 to pivot in the opposite direction about the pivot axis 70, in this embodiment clockwise, with the high surface of the cam surface abutting the housing 20 and the drive assembly 54 moving axially against the force of the resilient member 68 to disengage the drive portion 58 from the connecting portion 64. The vibration generated when the working head 26 works can be prevented from being transmitted to the driving assembly 54 and the operating assembly 56, and the service life of the driving assembly 54 and the operating assembly 56 can be prolonged.
The operation of removing the working head 26 is substantially the same as the operation of locking the working head 26, and the difference is mainly that the operation handle drives the cam portion 72 to rotate around the axis of the push rod portion 60 in the opposite direction, so that the nut portion 48 of the locking member 40 and the thread on the locking member 38 are loosened, and the description is omitted.
When the working head 26 is locked, the torque force generated by the rotation motion of the locking member 38 is transmitted to the output shaft 24 through the flange 46 and the working head 26, so that the output shaft 24 can rotate, the rotation of the output shaft 24 is not beneficial to locking the working head 26 on the output shaft 24, and the operation is inconvenient. To solve this problem, the power tool 100 of the present embodiment further includes an output shaft braking mechanism for fixing the output shaft 24 relative to the housing 20. The output shaft braking mechanism fixes the output shaft 24 relative to the housing 20 before the locking member 40 is rotated to be screw-locked with the locking member 38, thereby facilitating the operations of fixing the working head 26 on the output shaft 24 and removing the working head 26 from the output shaft.
In this embodiment, the output shaft braking mechanism is coupled to and operated by the drive mechanism. The driving mechanism is reasonably utilized, so that the power tool 100 is reasonable in structural layout and small in size, and the power tool 100 can conveniently extend into a narrow space to work.
The output shaft brake mechanism includes a brake member 78 fixed axially relative to the drive assembly 54 of the drive mechanism, and the operating assembly 56 is operable to move the brake member 78 into engagement with the output shaft 24 to lock the output shaft 24. In this embodiment, since detent 78 and drive assembly 54 are axially fixed, detent 78 and drive assembly 54 move in unison when operating assembly 56 controls axial movement of drive assembly 54 into engagement with coupling portion 64, and detent 78 engages output shaft 24 to lock output shaft 24 when drive assembly 54 is moved into engagement with coupling portion 64 of retaining member 40 to a final position.
Preferably, the present embodiment locks the output shaft 24 by the brake 78 locking the second gear 32 in abutment with the second gear 32. In this embodiment, the stopper 78 is preferably engaged with the bottom surface of the recess 50 provided on the end surface side of the receiving portion 36 of the output shaft 24 of the second gear 32 to lock the second gear 32, and has a simple structure and a reasonable layout.
Specifically, the stopper 78 is a hollow cylindrical member, and includes a first hollow portion and a second hollow portion that are axially arranged in this order and penetrate therethrough, and the first hollow portion is separated from the receiving portion 36 of the output shaft 24 with respect to the second hollow portion. The radial dimension of the first hollow portion is greater than the radial dimension of the second hollow portion, so that a step portion is formed between the first hollow portion and the second hollow portion, and one end of the driving portion 58 of the driving assembly 54, which is close to the receiving portion 36 of the output shaft 24, abuts on the step portion; the driving portion 58 and the end of the stopping member 78 away from the receiving portion 36 of the output shaft 24 are substantially flush, and the elastic member 68 abuts both the driving portion 58 and the stopping member 78, so that the stopping member 78 and the driving assembly 54 are axially fixed, i.e. there is no relative movement in the axial direction, and the operating assembly 56 moves the driving assembly 54 toward the locking member 40 and simultaneously moves the stopping member 78 toward the second gear 32 to lock the second gear 32 and finally the output shaft 24.
The first hollow portion has a length substantially equal to the length of the driving portion 58 of the locking member 40, the second hollow portion has a length substantially equal to the length of the nut portion 48 of the locking member 40, and the radial dimension of the second hollow portion is equal to or slightly greater than the outer diameter dimension of the nut portion 48. Thus, when the driving portion 58 is engaged with the connecting portion 64 of the locking member 40, the stopper 78 is just abutted against the bottom surface of the recess 50 of the second gear 32 and receives the nut portion 48 therein, and the compact structure can reduce the volume of the power tool.
In operation, referring to the state change of fig. 2 to 3, when the operating assembly 56 is pivoted counterclockwise about the pivot 70 to bring the driving portion 58 of the driving assembly 54 and the connecting portion 64 of the locking member 40 into engagement with each other, the stopper 78 abuts against the second gear 32 to lock the second gear 32 and lock the output shaft 24, whereby the stopper 78 abuts against the second gear 32 and locks the second gear 32 before the operator prepares to rotate the operating assembly 56 about the axis of the push rod portion 60 and finally brings the locking member 40 into rotation and locks the locking member 38. During the process of rotating the locking member 40 and the locking member 38 by the operating assembly 56, the second gear 32 and the output shaft 24 are always locked, so that the inconvenience of fixing the working head 26 on the output shaft 24 due to the movement of the output shaft 24 can be avoided.
Referring to the change of state of fig. 3 to 2, during the clockwise pivoting of the operating assembly 56 about the pivot 70 to disengage the driving portion 58 of the driving assembly 54 and the connecting portion 64 of the locking member 40, the stop member 78 moves synchronously with the driving assembly 54 to disengage from the second gear 32, thereby not interfering with the normal operation of the power tool 100.
In the present embodiment, the driving assembly 54, the braking member 78, the locking member 40 and the locking member 38 are all disposed coaxially with the output shaft 24, the driving assembly 54 moves along the axial extension direction of the output shaft 24 to engage or disengage with the locking member 40, and the braking member 78 moves along the axial extension direction of the output shaft 24 to lock or unlock the output shaft 24, and the structure is regular and reasonable.
As previously described, the elastic member 68 abuts the driving portion 58, and the elastic force provided by the elastic member 68 urges the driving portion 58 to have a tendency to move toward the connecting portion 64. At the same time, the elastic member 68 also abuts against the stopper 78, and the elastic force provided by the elastic member 68 urges the stopper 78 to have a tendency to move in a direction to lock the output shaft 24. The resilient member 68 provides a quick and efficient operation of the brake member 78 to lock the output shaft 24, and is simple and inexpensive.
The power tool 100 also includes a switch 80 for activating the motor 22. To prevent accidental actuation of the switch 80 during installation or removal of the working head 26, which could cause accidental injury due to actuation of the motor 22, the power tool 100 of this embodiment further includes a trigger stop 82 movable into and out of abutment with the switch 80, and the operating assembly 56 is operable to drive the trigger stop 82 out of engagement with the switch 80.
In particular, the operating assembly 56 is operable to drive the trigger stop 82 out of engagement with a trigger 81 provided on the switch 80. The trigger 81 is movable between a first position in which the trigger 81 abuts an electronic switch (not shown) controlling the activation of the motor to activate the motor, and a second position in which the trigger 81 is disengaged from the electronic switch (not shown) controlling the activation of the motor and the motor is off.
In this embodiment, the trigger stop 82 is pivotally disposed on the housing 20. Thereby triggering the pivotal movement of the stopper 82 to switch between two positions of abutment and disengagement with the switch 80, with a simple structure. The present embodiment preferably pivots the trigger stop 82 about an axis perpendicular to the axis of the output shaft 24. The layout is reasonable.
In this embodiment, the power tool 100 further includes a biasing member 84, the biasing member 84 urging the trigger stop 82 to have a tendency to move in a direction of abutting the switch 80. Thus, once the operating assembly 56 clears the trigger stop 82, the biasing member 84 will cause the trigger stop 82 to automatically return to a position abutting the trigger member 81 on the switch 80, preventing the switch 80 from being accidentally triggered, and ensuring safety.
Referring to the state change of fig. 2 to 3, during the movement of the operating assembly 56 in the direction of bringing the driving assembly 54 close to the connecting portion 64 of the locking member 40 and simultaneously bringing the braking member 78 close to the second gear 32, the operating assembly 56 is away from the trigger stop 82, the trigger stop 82 abuts against the switch 80, specifically against the trigger 81 on the switch 81, and the switch 80 cannot activate the motor 22.
Specifically, in the present embodiment, the operating assembly 56 moves counterclockwise about the pivot 70 to bring the driving assembly 54 close to the connecting portion 64 of the locking member 40 and bring the braking assembly close to the second gear 32. once the operating assembly 56 rotates counterclockwise about the pivot 70 against the force of the resilient latch 76, the operating assembly 56 starts to move away from the trigger stopper 82, the trigger stopper 82 moves toward the position abutting against the switch 80 under the action of the biasing member 84, and after the operating assembly 56 completely moves away from the trigger stopper 82, the trigger stopper 82 moves to the position abutting against the switch 80 under the action of the biasing member 84, so as to prevent the switch 80 from being accidentally triggered to cause injury. During disengagement of the operating assembly 56 from the trigger stop 82, the brake assembly has not moved into abutment with the second gear 32, but the switch 80 has been disabled from triggering the motor 22, ensuring safety.
Referring to the change of state from fig. 3 to fig. 2, after the operating assembly 56 moves the driving assembly 54 away from the connecting portion 64 of the locking member 40 and simultaneously moves the braking assembly away from the second gear 32, the operating assembly 56 abuts against the trigger stop 82, so that the trigger stop 82 is disengaged from the switch 80, and the switch 80 can activate the motor 22.
Specifically, in this embodiment, when the operating assembly 56 is moved clockwise about the pivot 70 to move the driving assembly 54 away from the connecting portion 64 of the retaining member 40 and move the braking assembly away from the second gear 32, the driving assembly 54 is completely disengaged from the connecting portion 64 of the retaining member 40 and the braking assembly is completely disengaged from the second gear 32 when the operating assembly 56 is moved clockwise about the pivot 70 to the limit position, the operating assembly 56 is only abutted against the trigger stop 82, so that the trigger stop 82 is disengaged from the switch 80 against the force of the biasing member 84, and at the same time, the operating assembly 56 is coupled to the elastic catch 76 of the housing 20, the operating assembly 56 is maintained in the position abutted against the trigger stop 82, and the operator can trigger the motor 22 to operate through the switch 80 as needed at any time.
It will be appreciated by those skilled in the art that other embodiments of the present invention are possible, as long as the technical spirit of the present invention is the same as or similar to the present invention, or any changes and substitutions based on the present invention are within the scope of the present invention.
Claims (11)
1. A power tool comprises a shell, a motor contained in the shell, an output shaft driven by the motor to pivot, a locking mechanism used for locking a working head on the output shaft, and a driving mechanism which is operably connected with the locking mechanism and drives the locking mechanism, and is characterized in that: the power tool further comprises an output shaft braking mechanism for fixing the output shaft relative to the shell, and the driving mechanism is connected with the output shaft braking mechanism.
2. The power tool of claim 1, wherein: the drive mechanism includes an operating assembly and a drive assembly coupled to the operating assembly, the operating assembly being operable to move the drive assembly into and out of engagement with the locking mechanism.
3. The power tool of claim 2, wherein: the output shaft braking mechanism includes a braking member fixed axially relative to the drive assembly, and the operating assembly is operable to move the braking member into abutment with the output shaft to lock the output shaft.
4. The power tool of claim 3, wherein: the moving direction of the braking piece is the axial extension direction of the output shaft.
5. The power tool of claim 3, wherein: an elastic member is arranged between the braking member and the shell, and the elastic force provided by the elastic member urges the braking member to have a tendency of moving towards a direction of locking the output shaft.
6. The power tool of claim 3, wherein: the output shaft is provided with a transmission mechanism, the transmission mechanism comprises a gear, and the braking piece is abutted against the gear to lock the gear so as to lock the output shaft.
7. The power tool of claim 2, wherein: the power tool further includes a switch for activating the motor, a trigger stop movable into and out of abutment with the switch, the operating assembly being operable to drive the trigger stop out of abutment with the switch.
8. The power tool of claim 7, wherein: the trigger stop is pivotably disposed on the housing.
9. The power tool of claim 8, wherein: the axis of pivoting of the trigger stop is perpendicular to the axis of the output shaft.
10. The power tool of claim 7, wherein: the power tool further includes a biasing member that urges the trigger stopper to have a tendency to move in a direction of abutting the switch.
11. The power tool of claim 1, wherein: the power tool is an angle grinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520001650.8U CN204621741U (en) | 2015-01-04 | 2015-01-04 | Power tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520001650.8U CN204621741U (en) | 2015-01-04 | 2015-01-04 | Power tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204621741U true CN204621741U (en) | 2015-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520001650.8U Active CN204621741U (en) | 2015-01-04 | 2015-01-04 | Power tool |
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| CN (1) | CN204621741U (en) |
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|---|---|---|---|---|
| WO2018001284A1 (en) * | 2016-06-28 | 2018-01-04 | 苏州宝时得电动工具有限公司 | Sanding machine, operating method thereof and working baseplate disassembly-assembly method |
| CN107745312A (en) * | 2016-06-28 | 2018-03-02 | 苏州宝时得电动工具有限公司 | The assembly and disassembly methods of sander and its operating method and working plate |
| CN107756202A (en) * | 2016-08-15 | 2018-03-06 | 苏州宝时得电动工具有限公司 | Sander |
| CN108175410A (en) * | 2018-02-26 | 2018-06-19 | 奥泰医疗系统有限责任公司 | A kind of magnetic resonance sick bed horizontal movement driving structure |
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