CN101623834A - Power tool - Google Patents
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- CN101623834A CN101623834A CN200810133864A CN200810133864A CN101623834A CN 101623834 A CN101623834 A CN 101623834A CN 200810133864 A CN200810133864 A CN 200810133864A CN 200810133864 A CN200810133864 A CN 200810133864A CN 101623834 A CN101623834 A CN 101623834A
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Abstract
The invention discloses a power tool comprising a casing, a motor and an output shaft, wherein the motor is contained in the casing, and the output shaft is matched and connected with a working head and is provided with a locking device capable of rotating between a locking position prohibiting the rotation of the output shaft and a release position permitting the rotation of the output shaft. When the motor is started, an electromagnet component drives the locking device to move from the locking position to the release position. In the invention, the locking device of the output shaft of the power tool automatically moves from the locking position to the release position when the motor is started, and the power tool is safe and convenient to operate.
Description
Technical field
The present invention relates to a kind of power tool, the particularly a kind of power tool that need when changing working head, lock output shaft, as electric circular saw, the angle mill, bakelite mills, electric drill, sander, diagonal cutting saw and large-scale cutting machine etc.
Background technology
Electric circular saw, the angle mill, bakelite mills, electric drill, sander cuts work such as polishing thereby power tools such as diagonal cutting saw and large-scale cutting machine normally drive the rotation of output shaft rotation drive working head by motor.In long-term use, working head is easy to wearing and tearing and needs to change working head.Perhaps in operating process, also often need to change the working head of various different sizes to adapt to different work requirements.But in the process of the instrument disassemble and assemble work head that uses spanner or similar functions, output shaft is easy to take place transfer, thereby is unfavorable for the dismounting of working head.Prior art has disclosed the various lock shaft devices that prevent the output shaft transfer.United States Patent (USP) is announced US5,430, a kind of electric circular saw that is disclosed for 944A number, an affixed disk on motor output shaft with groove, casing is provided with piston and depression bar, thereby the operation depression bar makes piston enter in the disk groove locking output shaft, unclamps the depression bar piston and resets under the elastic force of stage clip and unclamp output shaft.But this lock shaft device parts are many, and complex structure needs a hand operated depression bar locking output shaft in use, and instruments such as another hand use spanner carry out the dismounting of working head, operation effort and use inconvenience.Deutsche Bundespatent discloses the lock shaft device that discloses a kind of electric circular saw for DE19938299A1 number and is arranged in the axle center hole of output shaft, when inserting spanner disassemble and assemble work head, thereby spanner promotes the lock shaft device axially-movable against electric motor fan locking output shaft, when taking out spanner, lock shaft device resets under the effect of flexible member and unclamps output shaft.This lock shaft device utilizes spanner to lock output shaft in the disassemble and assemble work head, is easy to cause danger, and when particularly the operator forgot to take off spanner and promptly starts motor, spanner or fly out at a high speed caused the accident, or still locks output shaft and cause the motor damage.
Summary of the invention
Technical problem to be solved by this invention provides a kind of power tool, and the output shaft locking device of this instrument can automatic unlocking when motor is opened.
Another technical problem to be solved by this invention provides a kind of power tool, and the output shaft locking device of this instrument need not to use extra instrument can realize the locking of output shaft.
Another technical problem to be solved by this invention provides a kind of power tool, when the locking device of this instrument has avoided motor just to quit work, and output shaft locked suddenly.
Technical scheme of the present invention is: a kind of power tool, comprise casing, be housed in the motor in the casing, the output shaft that connects with working head, can and allow the locking device that moves between the released position of described output shaft rotation at the locked position that stops described output shaft rotation, during motor starting, electromagnet assembly drives described locking device and moves to the released position from locked position.
The start and stop that the release of output shaft and locking process all are accompanied by motor take place, and do not need operator's tool using specially output shaft to be locked.
Electromagnet assembly comprises the coil that is electrically connected with power supply, and locking device comprises the axially movable moving member of relative coil.During motor starting, the electromagnetic force that the electric current by coil in the electromagnet assembly produces moves locking device, the output shaft automatic unlocking.
Thus, a further technical scheme of the present invention is: described moving member moves axially with respect to output shaft.Described locking device comprises the fixture of fixedlying connected with motor shaft, and described moving member moves between locked position and released position with respect to fixture.
Preferably, described moving member is an active toothed disk, and described fixture is a fixed tooth disk, and during motor starting, moved end tooth on the active toothed disk and the fixed end tooth on the fixed tooth disk break away from; When motor stops, moved end tooth on the active toothed disk and the fixed end tooth engagement on the fixed tooth disk.
Another further technical scheme of the present invention is: described moving member moves radially with respect to output shaft.Described locking device comprises the fixture of fixedlying connected with output shaft, and described moving member moves between locked position and released position with respect to fixture.
Preferably, described moving member is a pin, and described fixture has the groove that relative output shaft is radially offered, and during motor starting, the groove on pin and the fixture breaks away from; When motor stops, the engagement on pin and the fixture.
Preferably, described locking device also comprises the elastic component of being located between coil and the moving member.Described electromagnet assembly also comprises electromagnet base, and described coil is contained in the electromagnet base, and described elastic component one end is resisted against on the electromagnet base, and the other end is resisted against on the moving member.Described elastic component is a spring.
For the sake of security, further technical scheme of the present invention is: power tool also comprises first switch of controlling motor and the second switch of controlling electromagnet assembly, and after first switch disconnected, the second switch time-delay disconnected.Like this, can guarantee that motor stops after, locking device moves to locked position again, has avoided in the process that output shaft progressively slows down taking place unexpected lock shaft, output shaft is produced impact.
Preferably, first switch and second switch are linked switches, after the second switch closure, and the first switch timing closing.Like this, can guarantee that in the motor starting process, output shaft is in the state of release fully.
Further, also comprise the gauge tap of connecting, control switch opens/closure when the electromagnet assembly action puts in place with first switch.Like this, after can guaranteeing electromagnet assembly really action putting in place, restart and close motor, avoid because locking device moves the impact that causes not in place and dangerous.
Description of drawings
The present invention will be further described below in conjunction with accompanying drawing and preferred embodiment.
Fig. 1 is the cutaway view of the electric circular saw of the present invention's first preferred embodiment, and wherein locking device is positioned at locked position.
Fig. 2 is the cutaway view of the electric circular saw of the present invention's first preferred embodiment, and wherein locking device is positioned at the released position.
Fig. 3 is along the cutaway view shown in the D-D among Fig. 2.
Fig. 4 is the vertical view of the electric circular saw of the present invention's second preferred embodiment.
Fig. 5 is that wherein locking device is positioned at locked position along the partial sectional view shown in the E-E among Fig. 4.
Fig. 6 is that wherein locking device is positioned at the released position along the partial sectional view shown in the E-E among Fig. 4.
Fig. 7 is along the partial sectional view shown in the F-F among Fig. 5.
Fig. 8 is the schematic diagram that the bakelite of the present invention's the 3rd preferred embodiment mills.
Fig. 9 is along the partial sectional view shown in the G-G among Fig. 8.
Figure 10 is the control circuit schematic diagram of using among the present invention.
Figure 11 is the sequential schematic diagram of switch work in the circuit shown in Figure 10.
Figure 12 is the another kind of control circuit schematic diagram of using among the present invention.
Figure 13 is the sequential schematic diagram of switch work in the circuit shown in Figure 12.
Figure 14 is the another kind of control circuit schematic diagram of using among the present invention.
Figure 15 is the sequential schematic diagram of switch and electromagnet assembly work in the circuit shown in Figure 14.
Wherein:
200,300 electric circular saws, 26 motors, 22 casings, 27 motor shafts
28 saw blades, 32 bearings, 34 bearings, 36 screws
37 securing members, 230 output shafts, 240 driving members, 260 electromagnet assemblies
262 coils, 264 active toothed disk 264a main body 264b moved end teeth
269 fixed end teeth, 270 fixed tooth disks, 272 motor shaft ends, 301 base plates
302 guard shields, 303 handles, 304 cables, 340 driving members
342 grooves, 360 electromagnet assemblies, 362 coils, 364 iron cores
365 collars, 366 elastic components, 367 fixed mounts, 368 electromagnet bases
369 connecting lines, 370 through holes, 371 end caps, 400 bakelites mill
402 casings, 404 handles, 406 cables, 408 chucks
409 pillars, 410 base plates, 412 depthkeeping chis, 414 adjusting knobs
416 motors, 418 output shafts, 420 fans, 460 electromagnet assemblies
462 coils, 464 iron cores, 465 collars, 466 elastic components
468 electromagnet bases, 469 connecting lines, 470 blind hole K1, first switch
K2 second switch K3 the 3rd K switch 4 gauge taps
The specific embodiment
It is the lock shaft structure that preferred embodiment specifies power tool that the present invention mills with electric circular saw and bakelite.The present invention also can be applied in the angle mill, and sander is on the power tools such as diagonal cutting saw and large-scale cutting machine.According to the different operating occasion of instrument, the output shaft of power tool and motor shaft can be the settings that is parallel to each other, and also can be orthogonal settings, also can be angled settings.But, concrete the position is set can't influences concrete enforcement of the present invention.Generally, the output shaft and the motor shaft of electric circular saw be arranged in parallel, and the output shaft of angle mill then is vertical setting with motor shaft.According to the present invention, dissimilar instruments can be arranged on locking device different positions.
Referring to accompanying drawing 1～3, first preferred embodiment of the present invention provides a kind of electric circular saw 200 that comprises the lock shaft mechanism of electromagnet assembly 260.Wherein, electric circular saw 200, comprise casing 22, be housed in the motor 26 of the charged arbor 27 in the casing 22, connect the output shaft 30 of saw blade 28, output shaft 30 rotatably is erected on the casing 22 by bearing 32,34, and an end of output shaft 30 is provided with screwed hole 36 and is threaded with the fixing securing member 37 of saw blade 28, the other end is socketed with driving member 240, and driving member 240 passes to output shaft 230 with motor shaft 27 engagements with rotatablely moving of motor 26.During motor 26 work, towards a direction rotation, drive output shaft and saw blade all the time, realize cutting.In order when 37 pairs of saw blades of instrument turn Fastener 28 such as use spanner carry out dismounting, prevent output shaft 230 transfers, but the present invention's first preferred embodiment to provide a kind of axially-movable to lock and/or loosen the lock shaft structure of output shaft.
In the present embodiment, electromagnet assembly 260 is located in the casing 22, links to each other with locking device.It comprises electromagnet base 268 and is located at the coil 262 that is electrically connected with power supply in the electromagnet base 268.Locking device comprise with respect to coil 262 axially movable moving members 264 and the fixture 270 of fixedlying connected with motor shaft 27 and be located at coil 262 and moving member 264 between elastic component 266.Fixture is to be set in the fixed tooth disk 270 of motor shaft 27 away from the motor shaft end 272 of transmission mechanism.Fixed tooth disk 270 comprises the main body of basic annular and is located at several fixed end teeth 269 on one of them end face of main body.It is fixedly connected with respect to motor shaft 27, can rotate and rotate along with motor shaft 27.Driving member 240 is the gears of fixedlying connected with output shaft 230.
Moving member in the present embodiment is an active toothed disk 264, comprises the main body 264a and the moved end tooth 264b that is located on the main body end face of primary circle annular.The excircle of its main body 264a part radially is extended with several projections 264c, the number of projection 264c and the number of the groove 268e on angle and the electromagnet base 268 is corresponding with the interval angle at interval.
When power supply is not switched on, there is not the electric current process in the coil 262 in the electromagnet assembly 260.Active toothed disk 264 is under the effect of the elastic force of elastic component 266, and its moved end tooth 264a is meshed with fixed end tooth 269 on the fixed tooth disk 270, and active toothed disk 264 is in the position of locking.Motor 26 is not activated, and motor shaft 27 remains static.The operator installs or dismantles saw blade 28 if desired, even rotate saw blade 28, because moved end tooth 264a and fixed end tooth 269 are meshed, active toothed disk 264 relative casings 22 maintain static, thereby fixed tooth disk 270 also maintains static with respect to casing 22, and the motor shaft 27 of fixedlying connected with fixed tooth disk 270 just can not rotate along with the rotation of saw blade 28 yet.At this moment, the position that output shaft 230 cannot not be in rotatablely, promptly locking device is in locked position.The operator can directly unload the nut 37 that is contained on the saw blade 28 with instrument, and does not need to pin motor shaft 27, another hand nutting with a hand.Dismounting and convenient, the safety of process that saw blade is installed.
When power supply is switched on, electromagnet assembly 260 gets with power connection, electric current is flowed through and is contained in coil 262 among the accepting groove 268b, the electromagnetic force that produces overcomes the elastic force of elastic component 266, active toothed disk 264 driven end tooth 264a and fixed end tooth 269 position engaged is moved to the position of moved end tooth 264a and 269 disengagements of fixed end tooth.When motor 26 started, motor shaft 27 can freely rotate, and then drove driving member 240 rotations, rotating saw blade 28.At this moment, output shaft 230 is in rotatable state, and promptly locking device is in the released position.
Because electromagnet assembly 260 can produce electromagnetic force and make active toothed disk 264 moving axially along output shaft 230 when motor 26 starts, automatically unclamp locking to output shaft 230, and motor 26 is removed the active force to active toothed disk 264 after stopping a period of time, active toothed disk 264 is moved under the effect of elastic component 266 in the other direction, automatically lock output shaft 230.Output shaft 230 can and stop automatic release and locking along with the startup of motor 26.Thereby whether the operator need not consider with output shaft locking or release, tool using that just can safe ready, and mount and dismount saw blade.
Owing to be respectively equipped with a plurality of teeth on active toothed disk 264 and the fixed tooth disk 270, when two fluted discs are meshing with each other, can realize the engagement in the 360 degree scopes basically.
Those of ordinary skills as can be known, the position that is provided with of fixture is not limited only to the end of motor shaft away from transmission mechanism, also can be arranged on the position of closing on electric motor fan.
Referring to accompanying drawing 4～7, second preferred embodiment of the present invention provides a kind of electric circular saw 300 that comprises the lock shaft mechanism of electromagnet assembly 360.Same, in the present embodiment with front embodiment in identical structure, use identical label in the accompanying drawings, do not do at this and give unnecessary details.Electric circular saw 300 comprises casing 22, is contained in motor (figure does not show) and transmission mechanism (figure does not show) in the casing 22, and handle 303 is arranged on the casing 22, is used to operate electric circular saw and moves relative to workpiece.Guard shield 302 is supported on and covers saw blade (figure does not show) on the base plate all the time.Motor is electrically connected with external power source (figure does not show) by cable 304.
Herein, fixture is the driving member of fixing 340 on the output shaft 230 of being arranged on.Driving member 340 comprises gear parts and the groove 342 that radially extends on an one axially outstanding end face.The number of groove 342 can have different according to designer's needs with the angle intervals of setting.
Moving member in the present embodiment is a pin.Columniform basically iron core 364 most preferably.The one end is provided with a circle annular groove, and collar 365 is set in the annular groove.Pin can be made with any permeability magnetic material, such as iron, and steel etc.The shape of pin also can be not limited only to cylindrical, can be rectangle, ellipse or the like.Collar can be one-body molded with the main body of pin, promptly on the end of a cylinder-shaped iron core crossette is set.
When power supply is not switched on, do not have the electric current process in the coil 362 in the electromagnet assembly 360, iron core 364 is compressed against on the casing 22 under the effect of the elastic force of elastic component 366.Groove 342 engagements on the end of iron core 364 and the driving member 340 are positioned at latched position.Motor 26 is not activated, and motor shaft 27 remains static.At this moment, thereby driving member 340 can keep inactive states with respect to casing 22, does not rotate, and the output shaft 230 fixedly connected with driving member 340 also keeps relative static, can not rotate.The operator installs or dismantles saw blade 28 if desired, even rotate saw blade 28, owing to fixed by iron core 364 relative casings 22 with the fixedly connected driving member 340 of output shaft 230, output shaft 230 just can not rotate along with the rotation of saw blade 28 yet.At this moment, the position that output shaft 230 cannot not be in rotatablely, promptly locking device is in locked position.The operator can directly unload the nut 37 that is contained on the saw blade 28 with instrument, and does not need to pin output shaft 230, another hand nutting 37 with a hand.Dismounting and convenient, the safety of process that saw blade is installed.
When power supply is switched on, the electromagnet assembly 360 that is electrically connected with power supply, electric current flowing through coil 362, the electromagnetic force of generation overcomes the elastic force of elastic component 366, and iron core 364 is moved to the position that the groove 342 of itself and driving member is thrown off from groove 342 position engaged with driving member.When motor 26 started, motor shaft 27 can freely rotate, and then drove driving member 340 rotations, rotating saw blade 28.At this moment, output shaft 230 is in rotatable state, and promptly locking device is in the released position.
Because electromagnet assembly 360 can produce electromagnetic force and make iron core 364 moving radially along output shaft 230 when motor 26 starts, unclamp locking to output shaft 230, and motor 26 is removed the electromagnetic force of 362 pairs of iron cores 364 of coil after stopping a period of time, iron core 364 is moved, locking output shaft 230 under the effect of elastic component 366 in the other direction.Output shaft 230 can and stop automatic release and locking along with the startup of motor 26, thereby whether the operator need not consider with output shaft 230 locking or releases, tool using that just can safe ready, and mount and dismount saw blade.
Those of ordinary skills as can be known, fixture can be not limited only to the gear fixedly connected with respect to output shaft, can also be any one element in the transmission mechanism between motor shaft and output shaft.
Referring to accompanying drawing 8～9, the 3rd preferred embodiment of the present invention provides a kind of bakelite of the lock shaft mechanism of electromagnet assembly 460 that comprises to mill 400.
Need high speed during milling cutter work, do not establish reduction gearing mechanism between motor 416 and the chuck 408.The front end of motor 418 directly links to each other with chuck 408 as output shaft 418.
Same, bakelite mills and is provided with locking device in 400.In the present embodiment, electromagnet assembly 460 is arranged at the position that is positioned in the casing 402 near output shaft 418, and the power supply that mills by connecting line 469 and bakelite is electrically connected.Similar to second preferred embodiment, electromagnet assembly 460 comprises the electromagnet base 468 and the coil 462 of support coils 462.Locking device comprises that relative coil 462 can axially movable moving member 464, output shaft 418 and be arranged on moving member 464 and electromagnet base 468 between elastic component 466.Coil 462 is electrically connected with power supply by connecting line 469.
Several blind holes of radially extending 470 have along the circumferential direction been offered on the output shaft 418 herein.The number of blind hole 470 can have different according to designer's needs with the angle intervals of setting.Also can directly be designed to through hole.In order to strengthen the rigidity of output shaft, can be on output shaft sheathed fixture, on fixture, offer groove or blind hole.
Moving member in the present embodiment be with second embodiment in an identical columniform basically iron core 464.The one end is provided with a circle annular groove, and collar 465 is set in the annular groove.
When power supply is not switched on, do not have the electric current process in the coil 462 in the electromagnet assembly 460, iron core 464 is compressed against on the output shaft 418 under the effect of the elastic force of elastic component 466.The end of iron core 464 is inserted in the blind hole 470 on the output shaft 418, is positioned at latched position.Motor 416 is not activated, and output shaft 418 can keep inactive state with respect to casing 402, does not rotate.The operator installs or dismantles milling cutter if desired, even rotate milling cutter, output shaft 418 can be along with rotation yet.At this moment, the position that output shaft 418 cannot not be in rotatablely, promptly locking device is in locked position.
When power supply was switched on, the electromagnet assembly 460 that is electrically connected with power supply got electric, electric current flowing through coil 462, and the electromagnetic force of generation overcomes the elastic force of elastic component 466, will shift out the blind hole 470 of iron core 464 from output shaft 418.When motor 416 started, output shaft 418 rotated, rotary chuck 408 and milling cutter wherein.At this moment, output shaft 418 is in rotatable state, and promptly locking device is in the released position.
Those skilled in the art as can be known, the drill bit of electric drill needs spindle lock equally when changing, avoid transfer.Thereby, also can use disclosed locking device in the electric drill, the structural similarity among embodiment that it is concrete and the 3rd embodiment.
For the sake of security, the present invention all is provided with delay circuit in the control circuit of the power supply of above-mentioned preferred embodiment.Referring to accompanying drawing 10～15, three kinds of different delay circuits are used to control the sequence of movement of motor and electromagnet assembly.
Below in conjunction with the present invention's second preferred embodiment, the concrete effect situation of three kinds of delay circuits is described.
In the delay circuit shown in Figure 10, second switch K2 is the time-delay disconnect.After first K switch, 1 closure, second switch K2 is simultaneously closed, and promptly motor 26 and electromagnet assembly 360 are simultaneously.And after first K switch 1 opened, second switch K2 can't open circuit simultaneously, but under the effect of delay circuit JS, time-delay a period of time T2 (T2＞0) opens, and guarantees that after motor 26 stops a period of time locking device works again.Like this, even saw blade 28 continues rotation under the effect of rotary inertia, the rotating speed of saw blade 28 progressively reduces, and electromagnet coil 362 also only can lose electromagnetic force again after delay circuit JS works thorough dead electricity, iron core 364 and groove 342 engagements.Thereby, avoided locking device that output shaft 230 is produced and impacted.
In the delay circuit shown in Figure 12, first K switch 1 and the 3rd K switch 3 are linked switches, and second switch K2 is the time-delay disconnect.The 3rd K switch 3 is at first closed, connects second switch K2, thereby electromagnet assembly 360 gets earlier.Process T1 first K switch, 1 closure after the time is connected motor 26.Motor shaft 27 rotations drive driving member 340 and output shaft 230 rotates.Discharge linked switch, first K switch 1 is at first opened, at this moment, and motor 26 dead electricity.Discharge linked switch fully, the 3rd K switch 3 postpones to open behind a period of time T3 (T3＞0).At this moment, second switch K2 still remains closed, and delay circuit makes that electric current does not disappear in the electromagnet assembly 360.Open after T2 after a while from first K switch 1, second switch K2 opens circuit, and delay circuit disconnects, electromagnet assembly 360 dead electricity, and coil 362 no longer produces active forces to iron core 364.Thus, iron core 364 meshes locking output shaft 230 with the groove 342 of driving member.Because electromagnet assembly 360 is than motor 26 first turn-on current, the electromagnetic force that electric current produces in the coil 362 can at first be pulled out iron core 364 groove 342 of driving member, makes output shaft 230 releases, guarantees after retaining mechanism is in the released position motor 26 to be rotated.Like this, be not subjected to the obstruction of retaining mechanism in the time of motor 26 being started.
In the delay circuit shown in Figure 14, first K switch 1 and the 3rd K switch 3 are linked switches, and second switch K2 is the time-delay disconnect, and the 4th K switch 4 is connected with iron core 364 in the electromagnet assembly 360.Press linked switch, first K switch 1, second switch K2 and the 3rd K switch 3 are closed simultaneously, at this moment, electromagnet assembly 360 gets earlier, the active force that electric current produces in the coil 362 is removed iron core 364 from the groove 342 of driving member, when iron core 364 is thrown off engagement with groove 342,, connect motor 26 with the gauge tap K4 closure of electromagnet mechanical connection.Motor shaft 27 rotations drive driving member 340 and output shaft 230 rotates.Discharge linked switch, first K switch, 1 instantaneous opening, motor 26 outages.Behind T3 after a while, the 3rd K switch 3 is opened.After T2 after a while, second switch K2 opens circuit, electromagnet assembly 360 dead electricity from first switch opens.Thereby retaining mechanism is in locked position, and promptly iron core 364 returns back to original position, and with the groove 342 maintenance engagements of driving member, output shaft is locked.After electromagnet assembly 360 resets fully, promptly from first switch opens after T4 (T4＞0) after a while, gauge tap K4 opens.Like this, in the time of can guaranteeing that motor 26 starts once more, locking device at first moves to the released position, connects motor 26 again, avoids possible potential safety hazard.
Above-mentioned delay circuit can be applied in the present invention's first preferred embodiment equally, the relative position relation of control active toothed disk 264 and fixed tooth disk 270.
Simultaneously, those of ordinary skills can be easy to expect, the delay circuit of mentioning of the present invention only is wherein several, and other can be realized that the delay circuit of said function is not done at this and make introductions all round.
According to inventive concept of the present invention, those of ordinary skills are easy to use above-mentioned elastic component instead other flexible member, as metal spring leaf or dish spring; And the driving member in the preferred embodiment of the present invention 240,340 also can use other driving members instead, as the belt wheel that is connected with motor shaft 27 by driving-belt.In a word, the present invention is not limited to the specific embodiment structure of being lifted, and the structure of conceiving based on the present invention all belongs to protection domain of the present invention.
Claims (15)
1. power tool, comprise casing, be housed in the motor in the casing, the output shaft that drives and connect with working head by motor, can and allow the locking device that moves between the released position of described output shaft rotation at the locked position that stops described output shaft rotation, it is characterized in that: during motor starting, electromagnet assembly drives described locking device and moves to the released position from locked position.
2. power tool according to claim 2 is characterized in that: described electromagnet assembly comprises the coil (262,362,462) that is electrically connected with power supply, and described locking device comprises the axially movable moving member of relative coil (264,364,464).
3. power tool according to claim 3 is characterized in that: described moving member (264) moves axially with respect to output shaft.
4. power tool according to claim 4 is characterized in that: described locking device comprises the fixture of fixedlying connected with motor shaft, and described moving member moves between locked position and released position with respect to fixture.
5. power tool according to claim 5 is characterized in that: described moving member is active toothed disk (264), and described fixture is fixed tooth disk (270), and during motor starting, the fixed end tooth (269) on moved end tooth (264a) on the active toothed disk and the fixed tooth disk breaks away from; When motor stops, fixed end tooth (269) engagement on moved end tooth (264a) on the active toothed disk and the fixed tooth disk.
6. power tool according to claim 3 is characterized in that: described moving member (364,464) moves radially with respect to output shaft.
7. power tool according to claim 6 is characterized in that: described locking device comprises the fixture of fixedlying connected with output shaft, and described moving member moves between locked position and released position with respect to fixture.
8. power tool according to claim 7 is characterized in that: described moving member is pin (364,464), and described fixture has the groove (342,470) that relative output shaft is radially offered, and during motor starting, the groove on pin and the fixture breaks away from; When motor stops, the engagement on pin and the fixture.
9. power tool according to claim 3 is characterized in that: described locking device also comprises the elastic component of being located between coil and the moving member (266,366,466).
10. power tool according to claim 9 is characterized in that: described electromagnet assembly also comprises electromagnet base (268,368,468), described coil is contained in the electromagnet base, and described elastic component one end is resisted against on the electromagnet base, and the other end is resisted against on the moving member.
11. power tool according to claim 9 is characterized in that: described elastic component is a spring.
12. power tool according to claim 2 is characterized in that: also comprise first switch (K1) of controlling motor and the second switch (K2) of controlling electromagnet assembly, after first switch disconnected, the second switch time-delay disconnected.
13. power tool according to claim 12 is characterized in that: first switch and second switch are linked switches, after the second switch closure, and the first switch timing closing.
14. power tool according to claim 13 is characterized in that: also comprise the gauge tap (K4) of connecting, control switch opens/closure when the electromagnet assembly action puts in place with first switch.
15. power tool according to claim 1 is characterized in that: described power tool is an electric circular saw, the angle mill, and electric drill, sander, bakelite mills, diagonal cutting saw or large-scale cutting machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101338645A CN101623834B (en) | 2008-07-13 | 2008-07-13 | Power tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101338645A CN101623834B (en) | 2008-07-13 | 2008-07-13 | Power tool |
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| CN101623834A true CN101623834A (en) | 2010-01-13 |
| CN101623834B CN101623834B (en) | 2011-05-18 |
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| CN2008101338645A Expired - Fee Related CN101623834B (en) | 2008-07-13 | 2008-07-13 | Power tool |
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| CN106827026A (en) * | 2017-04-11 | 2017-06-13 | 广州元凛建筑工程技术开发有限公司 | A kind of plate cutting device |
| CN106985027A (en) * | 2017-04-11 | 2017-07-28 | 广州犀鸟工业设计有限公司 | A kind of polissoir after welding |
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| DE4100412A1 (en) * | 1991-01-09 | 1992-07-16 | Bosch Gmbh Robert | ELECTRIC HAND TURNING MACHINE, IN PARTICULAR HAND CIRCULAR SAW |
| DE19938299B4 (en) * | 1999-08-12 | 2005-03-03 | Tts Tooltechnic Systems Ag & Co. Kg | Machine tool with a drive device for driving a rotating machine tool |
| CN2405708Y (en) * | 2000-01-18 | 2000-11-15 | 顾立德 | Portable electric spanner |
| CN201015835Y (en) * | 2007-03-15 | 2008-02-06 | 苏州宝时得电动工具有限公司 | Power tool |
| CN201067860Y (en) * | 2007-07-12 | 2008-06-04 | 苏州宝时得电动工具有限公司 | Hand-hold type power tool |
| CN201281220Y (en) * | 2008-07-14 | 2009-07-29 | 苏州宝时得电动工具有限公司 | Power tool |
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