CN103213106B - Electric hand tool - Google Patents
Electric hand tool Download PDFInfo
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- CN103213106B CN103213106B CN201010511565.8A CN201010511565A CN103213106B CN 103213106 B CN103213106 B CN 103213106B CN 201010511565 A CN201010511565 A CN 201010511565A CN 103213106 B CN103213106 B CN 103213106B
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- hand tool
- handle
- electric hand
- motor
- projection
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 37
- 238000001816 cooling Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000011449 brick Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- Control Of Direct Current Motors (AREA)
- Portable Power Tools In General (AREA)
Abstract
The present invention relates to a kind of electric hand tool, it comprises: housing, and it has handle; Motor, it is housed in housing the rotating speed being used for operationally driving working head and controlling working head; Displacement button, it is arranged on handle and is used for for operator presses; Elastic component, itself and described displacement button combine; Pressure sensor, it is connected with described elastic component, and provides output voltage according to the position of displacement button; Its Control Component, is connected with motor, and the voltage exported the described position according to displacement button responds and controls the rotating speed of motor changeably.By this structure, speed-regulating switch overall dimensions is greatly reduced, and then reduces the outside dimension of handle, thus the user facilitating hand-type less grips and operation.
Description
The application is applicant is " electric hand tool " in the denomination of invention that on January 19th, 2007 applies for, application number is the divisional application of the Chinese invention patent application of 200710019582.8.
Technical field
The present invention relates to a kind of electric hand tool, particularly relate to a kind of electric hand tool of adjustable working head rotating speed.
Background technology
Existing electric hand tool, as electric drill or electric screw driver, regulates the rotating speed of working head usually by the service speed gauge tap of operator.It generally includes a casing, and its handle having top to be connected with top of this casing, the bottom of handle is provided with the compartment for placing battery.This electric tool also has the button being arranged on and handle being used for supplying operator presses, the S/CO be connected with button.S/CO comprises potentiometer (potentiometer), be used for measuring the distance of button movement under the effect of operator presses and produce a signal of telecommunication proportional with this displacement, this signal of telecommunication can be sent to control element and also be sent to motor further.Thus the rotating speed of motor becomes special ratios with the displacement of button.In S/CO, also provide spring, can button be pushed when operator's release-push and make its homing.
Existing S/CO also comprises one first mechanical switch and one second mechanical switch.First mechanical switch is used for opening and turning off the electric power being supplied to control element and motor.Second mechanical switch is used for the mos field effect transistor (MOSFET when button press to terminal position in bypass control circuit; metallicoxidesemiconductorfieldeffecttransistor); thus, protect this field-effect transistor can not be destroyed due to excessive electric current.
In existing electric hand tool, motor is positioned in the bottom of handle, is only positioned at the top of the battery pack being housed in aforementioned cell compartments.Motor shaft is by the first gear reduction system and be connected in the second gear reduction system along the first rotating shaft that handle extends, wherein the second gear reduction system is arranged in the high rotating speed of top for reducing motor shaft of casing, and then the second gear reduction system is connected with working head by the second rotating shaft.
It is emphasized that existing S/CO makes its overall dimensions quite large owing to containing potentiometer, control device and first and second mechanical switch.
Thus, cause the size of handle also quite large, as handle has larger diameter, it may be 6 centimetres or larger, so, for the people that hand sizes is less, as some Asians or women user, it is very difficult for holding handle line operate of going forward side by side.In addition, because the size of gauge tap is comparatively large, the bottom that motor must be placed in handle uses the first gear reduction system thus avoids the first rotating shaft and existing gauge tap to clash.
Also it is emphasized that potentiometer is more easy to wear in use for some time, it may be subject to the impact of dust, moisture and Salt Lake Environments (as seashore), and produces frictional force to stop the smooth and easy slip of button.
Summary of the invention
The invention provides a kind of electric hand tool, it has the handle of relative small size, thus is convenient to the less user's gripping of hand-type and operation.
For achieving the above object, technical scheme of the present invention is: a kind of electric hand tool, comprising: housing, and it has handle; Motor, it is housed in housing the rotating speed being used for operationally driving working head and controlling working head; Displacement button, it is arranged on handle and is used for for operator presses; Elastic component, itself and described displacement button combine; Pressure sensor, it is connected with described elastic component, and provides output voltage according to the position of displacement button; Its Control Component, is connected with motor, and the voltage exported the described position according to displacement button responds and controls the rotating speed of motor changeably.
Compared with prior art, the speed-regulating switch of electric hand tool of the present invention is owing to have employed pressure sensor to sense and exporting speed-regulating signal, speed-regulating switch overall dimensions is greatly reduced, and then reduces the outside dimension of handle, thus the user facilitating hand-type less grips and operation.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the invention will be further described.
Fig. 1 is the floor map of electric hand tool in first embodiment of the invention and internal structure thereof.
Fig. 2 is the partial enlarged drawing of Fig. 1, mainly discloses the speed regulation switch mechanism of electric hand tool.
Fig. 3 and Fig. 2 is similar, there is disclosed the speed regulation switch mechanism of the electric hand tool in alternative embodiment of the present invention.
Fig. 4 and Fig. 2 is similar, there is disclosed the speed regulation switch mechanism of the electric hand tool in alternative embodiment of the present invention.
Fig. 5 is the stereo amplification figure of the elastic component of speed regulation switch mechanism in Fig. 4.
Fig. 6 and Fig. 2 is similar, there is disclosed the speed regulation switch mechanism of the electric hand tool in alternative embodiment of the present invention.
Fig. 7 and Fig. 2 is similar, there is disclosed the speed regulation switch mechanism of the electric hand tool in alternative embodiment of the present invention.
Fig. 8 is the stereo amplification figure of the pressure sensor of the speed-regulating switch of electric hand tool of the present invention.
Fig. 9 to Figure 11 is the floor map of electric hand tool and internal structure thereof in other three embodiments of the present invention, which discloses different motors or the arrangement form of battery.
Figure 12 is the circuit block diagram of gauge tap assembly in another embodiment of electric hand tool of the present invention, switch wherein on same dotted line represents that this some switch or electronic component can be integral types, or can be controlled by a common shift knob.
Detailed description of the invention
As shown in Figure 1, in the present embodiment, electric hand tool 2 is the electric drill of being powered by battery 4, and it has housing 6.The foot 12 that its middle shell 6 comprises a top 8, the handle 10 extended by top 8 downwards and is positioned at bottom handle.In top 8, be provided with direct current generator 14, electric motor fan 16 for cooling motor 14, the gear reduction system 18 be connected by motor shaft 20 with motor 14, and a printed circuit board (PCB) 22, this circuit board 22 is provided with the rotating speed that electronic component is used for controlling motor 14.One output shaft 24 extends from gear reduction system 18 and to be convexly exposed at housing 6 and to be connected with a chuck 26.When electric drill works, a working head 28 is clamped in chuck 26 to be processed workpiece (not shown).
Handle 10 has a relatively little outside dimension D, and this outer diameter D is 4 centimetres in the present embodiment, can certainly be less.One speed-regulating switch 30 is arranged on handle 10.This speed-regulating switch 30 comprises the displacement button 32 for the pressing of user's hand, the elastic component 34 that one end is connected with displacement button 32, this elastic component 34 is a helical spring in the present embodiment, and has relative small size and the pressure sensor 34 be connected with elastic component 34 other end.This pressure sensor 34 can be a piezoelectric transducer (piezoelectricsensor) in the present embodiment, for providing output voltage signal according to the position of displacement button 32.Then output voltage signal is delivered to the Control Component on circuit board 22 via electric lead 38.The output voltage signal of Control Component to pressure sensor 36 responds, and according to the change of the position of displacement button 32, controls the rotating speed of motor 14 changeably, and then controls the rotating speed of working head 28.It should be noted that, between circuit board 22 and motor 14, be provided with electric lead, because this set is well known for ordinary skill in the art, so do not show in figure.Power brick 40 is served as by the foot 12 of housing 6, is used for holding the battery 4 of specific quantity.This power brick 40 wall and diapire offers some through holes 42,44 respectively thereon.Thus handle 10 can be used as cooling duct, cooling blast can flow through handle along arrow 48 direction in Fig. 1.It should be noted that, between battery 4 and circuit board 22, be provided with electric connection wire, because this set is well known for ordinary skill in the art, so do not show in figure.
One mechanical power switch 50 is arranged on the sidepiece of handle 10, for providing or the electric power of sever supply circuit board 22 and motor 14.The operation that the position on handle of power switch 50 can make operator that one hand can be used easily to realize itself and speed-regulating switch simultaneously.
Fig. 2 is the close-up schematic view of Fig. 1, mainly discloses the structure of speed-regulating switch 30, does not demonstrate signal transmission wire in figure.The lead-in cavity 52 of speed-regulating switch 30 is used for covering displacement button 32, elastic component 34 and pressure sensor 36.Major part and the pressure sensor 36 of lead-in cavity 52 are positioned at handle 10.Lead-in cavity 52 has rear wall 54, and pressure sensor 36 is fixedly attached on this rear wall 54 by screw 56.
As shown in Figure 3, displacement button 32, elastic component 34, pressure sensor 36 and the lead-in cavity 52 with rear wall 54 can form a stand-alone assembly.It should be noted that this stand-alone assembly can be arranged on outside handle 10, connected the rear wall 54 of lead-in cavity 52 and the sidewall of handle 10 by screw 58, this stand-alone assembly can be fixedly installed on handle 10 relatively easily.Displacement button 32 can move to the second end position n from first end position m, and wherein the spacing of m to n can be as small as 0.5-1 centimetre.
Fig. 4 and Fig. 5 is Alternate embodiments of the present invention, and the speed-regulating switch wherein disclosed have employed the elastic component 34 of other configurations.In the present embodiment, elastic component 34 is hairpin shape, its two elastic legs having rounded nose and extended by head.The pin 60 that wherein rounded nose is fixed in handle wall or lead-in cavity 52 passes, and two elastic legs extend in the space between displacement button 32 and pressure sensor 36 also to be distinguished on resilient abutment shift button 32 in place and pressure sensor 36.Elastic component 34 by an elastic metallic yarn or can have that the flexure strip of narrower width is bending to be formed.
In the Alternate embodiments of the present invention that Fig. 6 discloses, elastic component 34 is fixed on by pin 60 resonance steel plate handle 10 also can being done move pivotally.In the present embodiment, lead-in cavity 52 is arranged on the outside of handle 10, and displacement button 32 is housed in lead-in cavity 52.Displacement button 32 has projecting ends 32a, its can with the middle part resilient abutment of steel plate 34.The comparatively lower part of steel plate 34 and pressure sensor 36 against, the mode of pressure sensor 36 then by knowing, as screw connects, with the fixation wall 62 on housing 6 against.
In Alternate embodiments of the present invention shown in Fig. 7, the major part of lead-in cavity 52 is positioned at handle 10.In the present embodiment, displacement button 32 is directly connected with pressure sensor 36; Elastic component 34 is helical spring, its one end and pressure sensor 36 against, the other end is resisted against on the rear wall 54 of lead-in cavity 52.
Shown in Fig. 8 is be applicable to the pressure sensor 36 in all embodiments of the present invention, and it is rectangular-shaped, has less size, and its thickness d can be 2 millimeters or even less.
In Alternate embodiments of the present invention as shown in Figure 9, because the size of speed-regulating switch in the present invention 30 is less, make to also have unnecessary space in relatively little handle 10, these spaces may be used for holding portion battery 4.In the present embodiment, in foot 12, contain 3 batteries 4, in handle 10, contain 3 batteries 4.By this layout, foot 12 can be made to keep less size relative to existing design.
In the embodiment shown in Fig. 1 and Fig. 9, direct current generator 14 is arranged on the top 8 of housing 6, and in the Alternate embodiments of the present invention shown in Figure 10 and 11, direct current generator 14 has been arranged on the top of handle 10.
In the embodiment shown in Figure 10, motor 14, motor shaft 20 and electric motor fan 16 are arranged in handle 10.Motor shaft 20 extends along handle 10, and the rotation function that motor 14 exports is delivered to gear reduction system 18 by the bevel-gear sett 66 at right angles arranged and is used for reducing rotary speed, is then delivered to further on working head 28 by output shaft 24 and chuck 26.Speed-regulating switch 30 is connected on circuit board 22 by electric lead 38, and three batteries 4 are housed in handle 10, and three batteries 4 are housed in foot 12.Foot 12 has through hole 44, and top 8 is provided with opening 68, and cooling blast flows into by opening 68, flows through handle, and is flowed out by through hole 44.The fan 70 be connected with one of them bevel gear 66 is provided with, for cooling circuit board 22 in top 8.
Substantially identical with the embodiment shown in Figure 10 in embodiment as shown in figure 11, wherein six batteries are all disposed in the bottom of handle 10.
Shown in Figure 12 is the circuit block diagram of gauge tap assembly in another embodiment of electric hand tool of the present invention.In the present embodiment, motor (not shown) is connected between M1 and M2, provides electric power by power brick B.Wherein S1 is displacement button, and the change of its position is sensed by the Control Component (not shown) in alignment circuit by piezo-resistance R (part of pressure sensor), and regulates accordingly the rotating speed of motor.In the present embodiment, all right gauge tap S1-1 and S1-2 of displacement button S1, wherein, S1-1 is the power switch for providing electric power, and S1-2 is for making motor brake instantaneously after unclamping displacement button operator thus making the brake switch that working head can stop operating rapidly.It should be noted that power switch S1-1 and brake switch S1-2 is in oppositely arranging, that is, when power switch S1-1 folding, brake switch S1-2 is in off state; And when power switch S1-1 turns off, brake switch S1-2 is in folding condition.When displacement button S1 presses, brake switch S1-2 first disconnects, and namely the brake function of motor is blocked, and meanwhile, power switch S1-1 is closed to be connected, and alignment circuit correspondingly regulates the rotating speed of motor according to the control of operator's contraposition shift button; When operator unclamps displacement button S1, power switch S1-1 can first disconnect, and simultaneously brake switch S1-2 is closed connects, and rear motor brakes instantaneously and makes the rapid stall of working head.Also be provided with the diode D in parallel with brake switch S1-2 in circuit, for absorbing the counter electromotive force of motor after motor brake stall.Those of ordinary skill in the art can easily it is contemplated that power switch S1-1 and brake switch S1-2 be mechanical switch, and can be made of one formula with displacement button S1; Or power switch S1-1 and brake switch S1-2 and displacement button S1 is provided separately, regulates opening and closing order by Control Component, thus can make the size of the handle of collecting displacement button S1 can be enough little.
S2 is the reversing switch for controlling motor steering, and it comprises switch S 2-1 and the S2-2 of two interlocks.When switch S 2-1, S2-2 lay respectively at some a, c position, electric current flows to M1 by M2, and now motor rotates forward; When needs motor reversal, stir reversing switch S2, now, switch S 2-1, S2-2 contact with some b, a d respectively, and electric current like this will flow to M2 by M1, thus realize the reversion of motor.Usually, switch S 2 is arranged near switch S 1, and is provided with mutual interlocking gear between switch S 1 and S2, to avoid the user maloperation reversing switch S2 when motor rotation and to damage motor.This mutual interlocking gear is well known to those of ordinary skill in the art and can realizes easily, so applicant is no longer repeated.
Claims (10)
1. an electric hand tool, comprising:
Housing, it has handle;
Motor, is housed in housing the rotating speed being used for operationally driving working head and control working head;
Displacement button, is arranged on handle and is used for for operator presses;
It is characterized in that:
Described electric hand tool comprises elastic component, together with described elastic component connects with described displacement button;
Pressure sensor, is connected with described elastic component, and provides output voltage according to the position of displacement button;
Control Component, is connected with motor, and responds to the voltage that described pressure sensor exports according to the position of displacement button and control the rotating speed of motor changeably, and described Control Component to be arranged in housing and to be positioned at outside handle portion.
2. electric hand tool according to claim 1, it is characterized in that: in described handle, contain battery, described electric hand tool also comprises the output shaft be connected with working head, described output shaft is connected with chuck, described chuck clamping working head, in the plane vertical with described output shaft, along in the projection of described battery above edge in the projection of described displacement button, along under the projection of described battery above edge under the projection of described displacement button.
3. electric hand tool according to claim 2, is characterized in that: at least accommodate 3 batteries in described handle, and the lengthwise bearing of trend of described battery and handle bearing of trend are in the same way.
4. electric hand tool according to claim 1, it is characterized in that: described motor is housed in handle, described electric hand tool also comprises the output shaft connecting working head, described output shaft is connected with chuck, described chuck clamps described working head, in the plane vertical with described output shaft, along the below on edge in the projection of described motor in the projection of described displacement button, along under the projection of described motor above edge under the projection of described displacement button.
5. electric hand tool according to claim 4, is characterized in that: contain battery in described handle, and described battery is arranged at the side of motor away from described output shaft.
6. electric hand tool according to claim 5, is characterized in that: 2 batteries that described battery is arranged along the direction serial that handle extends.
7. electric hand tool according to claim 5, is characterized in that: described battery 2 batteries being set up in parallel horizontal relative to handle bearing of trend.
8. electric hand tool according to claim 1, is characterized in that: described electric hand tool comprises two fans, is respectively used to cool described motor and described Control Component.
9. electric hand tool according to claim 8, it is characterized in that: described electric hand tool also comprises the output shaft be connected with working head, described output shaft is connected with chuck, described chuck clamps described working head, in the plane vertical with described output shaft, along the below on edge in the projection of described Control Component in the projection of the described fan for cooling Control Component, along under the projection of described Control Component above edge under the projection of the described fan for cooling Control Component.
10. electric hand tool according to claim 1, is characterized in that: described electric hand tool comprises the fan for providing cooling blast, the battery of described cooling blast by arranging in described handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010511565.8A CN103213106B (en) | 2007-01-19 | 2007-01-19 | Electric hand tool |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010511565.8A CN103213106B (en) | 2007-01-19 | 2007-01-19 | Electric hand tool |
| CN 200710019582 CN101224571B (en) | 2007-01-19 | 2007-01-19 | Hand-held electric tool |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710019582 Division CN101224571B (en) | 2007-01-19 | 2007-01-19 | Hand-held electric tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103213106A CN103213106A (en) | 2013-07-24 |
| CN103213106B true CN103213106B (en) | 2015-12-09 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010511565.8A Expired - Fee Related CN103213106B (en) | 2007-01-19 | 2007-01-19 | Electric hand tool |
| CN 200710019582 Expired - Fee Related CN101224571B (en) | 2007-01-19 | 2007-01-19 | Hand-held electric tool |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710019582 Expired - Fee Related CN101224571B (en) | 2007-01-19 | 2007-01-19 | Hand-held electric tool |
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| Country | Link |
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| CN (2) | CN103213106B (en) |
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| US5365155A (en) * | 1990-10-22 | 1994-11-15 | Marquardt Gmbh | Rotational speed control and use of same to control the rotational speed of an electric hand tool motor |
| DE10242414A1 (en) * | 2002-09-12 | 2004-03-25 | Hilti Ag | Power tool with blower |
| DE102004025951A1 (en) * | 2004-05-27 | 2005-12-22 | Robert Bosch Gmbh | Hand tool, in particular drill and / or percussion hammer |
-
2007
- 2007-01-19 CN CN201010511565.8A patent/CN103213106B/en not_active Expired - Fee Related
- 2007-01-19 CN CN 200710019582 patent/CN101224571B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5014793A (en) * | 1989-04-10 | 1991-05-14 | Measurement Specialties, Inc. | Variable speed DC motor controller apparatus particularly adapted for control of portable-power tools |
| US5033552A (en) * | 1990-07-24 | 1991-07-23 | Hu Cheng Te | Multi-function electric tool |
| US6186709B1 (en) * | 1999-04-01 | 2001-02-13 | Mobiletron Electronics Co., Ltd. | Speed change control structure for an electric tool |
| CN2691797Y (en) * | 2004-03-30 | 2005-04-13 | 苏州宝时得电动工具有限公司 | Electric tool |
| CN1803397A (en) * | 2005-01-11 | 2006-07-19 | 苏州宝时得电动工具有限公司 | Cyclonic tool |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101224571B (en) | 2013-07-31 |
| CN103213106A (en) | 2013-07-24 |
| CN101224571A (en) | 2008-07-23 |
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