CN108488285A - Electric tool and its spring - Google Patents
Electric tool and its spring Download PDFInfo
- Publication number
- CN108488285A CN108488285A CN201810559123.7A CN201810559123A CN108488285A CN 108488285 A CN108488285 A CN 108488285A CN 201810559123 A CN201810559123 A CN 201810559123A CN 108488285 A CN108488285 A CN 108488285A
- Authority
- CN
- China
- Prior art keywords
- spring
- electric tool
- thickness
- spiral structure
- turn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000005452 bending Methods 0.000 claims description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 230000003811 curling process Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/04—Wound springs
- F16F1/10—Spiral springs with turns lying substantially in plane surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/04—Wound springs
- F16F1/12—Attachments or mountings
- F16F1/123—Attachments or mountings characterised by the ends of the spring being specially adapted, e.g. to form an eye for engagement with a radial insert
Abstract
This application provides a kind of electric tool and its springs.Spring (100) for electric tool includes：Ontology (110) comprising the spiral structure of multi-turn and the inner hook part (130) being connect with the innermost circle (112) of the spiral structure, for the spring (100) to be fixed to the electric tool；Outer hook portion (120) connect with the outmost turns (111) of the spiral structure, for providing pressing force for the electric tool.There is the gap of the thickness of the material more than the spring (100), the ontology (110) to have the space loss portion (113) of the thickness of the material less than the spring (100) between the opposed position of adjacent turn at least at one between the opposed position of adjacent turn of the ontology (110).
Description
Technical field
The present invention relates to a kind of spring for electric tool and the electric tools of subsidiary this spring.
Background technology
Various electric tools, especially portable power tool, are widely used.In electric tool in use, usual
The pressing to the component in electric tool is realized using spring.
Spring be it is a kind of utilize elasticity come work machine components.The type complexity of spring is various, wherein wind spring can be
Larger restoring force is persistently provided in narrow space, and there is tireless characteristic, therefore wind spring is widely used in electricity
Power driven tools.Wind spring includes the multi-turn spiral structure of spiral in structure, and when work, the spring material for forming spiral structure generates
The elasticity of flexure deforms.But when the considerable this spring of quantity be mixed in together be packed into a packaging bag when, these springs by
There is gap between its multi-turn spiral structure, so these springs can mutually be stuck.Using this on electric tool
Before spring, need to detach these springs being stuck, such work is time-consuming and laborious.
Therefore, it is necessary to be modified to the spring of electric tool, to overcome defect existing in the prior art.
Invention content
In view of above-mentioned technical problem, present applicant proposes a kind of improved spring for electric tool and it is accompanied with this
The electric tool of kind spring, the spring structure is simple, at low cost, easily operated.
For this purpose, according to the one side of the application, a kind of spring for electric tool is provided.The spring includes：
Ontology comprising the spiral structure of multi-turn and the inner hook part being connect with the innermost circle of the spiral structure are used for the bullet
Spring is fixed to the electric tool；Outer hook portion is connect with the outmost turns of the spiral structure, for being carried for the electric tool
For pressing force.There is the gap of the thickness of the material more than the spring between the opposed position of adjacent turn of the ontology, it is described
Ontology has the space loss portion of the thickness of the material less than the spring at least at one between the opposed position of adjacent turn.
According to a kind of embodiments possible, the space loss portion is configured as：The spiral structure of the multi-turn it is adjacent
Gap between two circles has the gap portion of the thickness of the material less than the spring, and the space loss portion passes through ontology
Independent process other than curling process is formed.
According to a kind of embodiments possible, the space loss portion bends process shape by sleeving and riveting process or wide-angle
At.
According to a kind of embodiments possible, the inner hook part is included in the at one end bending of the innermost circle and is formed curved
Folding part, the space loss portion are configured as：The diameter between position of the inflection point of the bending part and the innermost circle
It is less than the thickness of the material of the spring to distance.
According to a kind of embodiments possible, the space loss portion is configured as：The end of the bending part with it is described most
The radial distance between position of inner ring is less than the thickness of the material of the spring.
According to a kind of embodiments possible, the innermost circle part of the inner hook part has a protrusion, the protrusion and its
The radial distance between position of an adjacent circle is less than the thickness of the material of the spring.
According to a kind of embodiments possible, the outer hook portion is the outer hook portion of V-arrangement, is had in the end of the outer hook portion reversed
Bending part, the spiral structure of the multi-turn, the inner hook part, the outer hook portion and the reversed bending part are formed as one formula knot
Structure.
According to a kind of embodiments possible, the spring is plane scroll spring.
According to a kind of embodiments possible, the spring (100) provides pressing force for the carbon brush in the electric tool.
According to a kind of embodiments possible, the electric tool is angle grinder.
According to the application, one end of spring is fixedly attached to electric tool, and the other end is connected with electric tool, and
And pressing force is provided for electric tool using its torsional forces, this spring applicability itself is wide, simple in structure, at low cost, easily
In operation.
Description of the drawings
Below by according to specific implementation mode and in conjunction with attached drawing come be more completely understood and recognize the above-mentioned of the application and
Other aspects, in the accompanying drawings：
Fig. 1 shows the state signal that the spring according to a kind of embodiments possible of the application is arranged in electric tool
Figure.
Fig. 2 shows the structural schematic diagrams according to the spring of the embodiments possible of the application a kind of.
Fig. 3 shows the structural schematic diagram of the spring of another embodiments possible according to the application.
Fig. 4 shows the structural schematic diagram of the spring of another embodiments possible according to the application.
Specific implementation mode
It will now be described with reference to the drawings some embodiments of the application.
Present invention relates generally to electric tools, have the spring being disposed therein.The electric tool is especially just
Portable electric tool, such as annular saw, angle grinder, abrasive machine etc..Spring is arranged in electric tool, using its spring force come for electricity
Component in power driven tools provides pressing force.For example, spring is arranged in the motor of electric tool, one end of spring and the carbon of motor
Brush connects, and pressing force is provided for carbon brush.
Fig. 1 shows a kind of state signal of the spring for electric tool of embodiments possible according to the application
Figure.As shown in Figure 1, spring 100 is spiraled by flat wire, and in electric tool.One end 130 of spring 100 is used for will
Spring 100 is fixed in the fixing axle 1 of electric tool.The other end 120 of spring 100 connects with the carbon brush 2 of the motor of electric tool
Touch connection.Here, carbon brush 2 is located at the lower section of the end 120 of spring, and is connect with the conducting wire L of electric tool.Make the end 120
Elasticity of flexure deformation is generated under the action of torque, spring 100 is made planar to generate torsion with having torque, the material of spring 100
Turn, the size of deformation angle is directly proportional to torque, to which spring 100 can be that the carbon brush 2 contacted with its end 120 provides pressing
Power F.The direction of pressing force F is as illustrated by the arrows in fig. 1.Although illustrating spring 100 in Fig. 1 to be spiraled by flat wire,
It should be appreciated that spring 100 can also be revolved by the drum of other forms, it is without being limited thereto.
In the following, being illustrated to the concrete structure of spring in conjunction with Fig. 1 and Fig. 2.
Fig. 2 shows the structural schematic diagrams according to the spring of the embodiments possible of the application a kind of.As shown in Fig. 2, bullet
Spring 100 is in general planar shape, and includes：Ontology 110 and outer hook portion 120.Ontology (110) include the spiral structure of multi-turn with
And the inner hook part (130) being connect with the innermost circle (112) of spiral structure, it is described electronic for the spring (100) to be fixed to
Tool.
Ontology 110 includes the spiral structure of multi-turn.Here, the number of turns of spiral structure can be set according to concrete application.
Spiral structure can be that the material of spring 100 surrounds the same center of circle and spirals many coil structures of winding in the plane.In some implementations
In example, the multi-turn of spiral structure is equidistant placement.It should be appreciated that when the material for belleville springs 100 is flat wire, spring
The thickness of 100 material refers to the thickness of flat wire.When the material for belleville springs 100 is round wires, the material of spring 100
Thickness refer to the diameters of round wires.Certainly, the pattern of the material of spring 100 is without being limited thereto, can be any pattern appropriate.
In some embodiments, there is the material more than spring (100) between the opposed position of adjacent turn of ontology (110)
The gap of thickness, and the spiral structure of multi-turn has between the opposed position of adjacent turn at least at one and is less than the spring 100
Material thickness space loss portion 113.For example, in annular gap between the two adjacent rings of spiral structure, have small
In the space loss portion 113 of the thickness of the material of spring 100.In spiral structure, it is less than the thickness of the material of the spring 100
Space loss portion 113 at least have one at, it is possible to have place at two or more.That is, in the annular of spiral structure
In gap, there are sufficiently small space loss portion (at least below the thickness of the material of spring), so that this gap (spacing)
It can not be caught in another spring, as a result, when multiple this springs are put together, they are not in engage with each other together
The problem of.
With continued reference to Fig. 2, ontology 100 includes inner hook part 130.Inner hook part 130 includes the portion of the innermost circle 112 of spiral structure
Point and innermost circle 112 at one end bending and formed bending part 131.In some embodiments, inner hook part 130 is most interior
The part of circle 112 forms the structure of substantially semicircle with bending part 131.In some embodiments, bending part 131 is in spiral structure
Innermost circle 112 at one end bending crotch.The bending angle α of bending part 131 is preferably 90 °, in order to stabilize ground is fixed to
In the fixing axle 1 of electric tool, it is not easy to shake.Certainly, the bending angle α of bending part can also be other suitable angles.It is interior
Spring 100 is fixed on electric tool by hook portion 130 using its hook-shaped bending structure.For example, as shown in Figure 1, bending part
131 are fastened in the fixing axle 1 of electric tool.
Outer hook portion 120 can be the shackle link portion being connect with one end of the outmost turns of spiral structure 111.For example, outer hook portion
120 connect with 111 tangent line of outmost turns.Outer hook portion 120 is connect with the component touch of electric tool, for example, the pressing of outer hook portion 120 exists
2 top of carbon brush of the motor of electric tool, while inner hook part 130 is fastened in the fixing axle 1 of electric tool, hook portion outer in this way
120 generate torsional forces, are that the carbon brush 2 being in contact with it provides pressing force (the pressure F in such as Fig. 1) to realize spring 100.
In some embodiments, the end of outer hook portion 120 have reversed bending part 121, so as to prevent its end due to
It is excessively sharp and damages the component in electric tool.Certainly, the end of outer hook portion 120 can also use other structures, so as to
Play the role of preventing its end from damaging the component in electric tool due to being excessively sharp.
With continued reference to Fig. 2, the inflection point P1 of the bending part 131 of inner hook part 130 and the innermost circle 112 of spiral structure face
Radial distance between position is less than the thickness of the material of spring 100, and even zero.In some embodiments, for the bullet that spirals
The material of spring 100 is the roughly equal material of thickness.Certainly, in the unequal situation of thickness of the material for belleville springs 100
Under, which should be less than the minimum thickness of the material of spring 100.That is, the structure of the inner hook part of this spring makes
The radial distance between position is sufficiently small (at least below the thickness of the material of spring) with the innermost circle of spring for it, so that
This distance (gap) can not be caught in another spring, and as a result, when multiple this springs are put together, they are not in
The problem of engaging with each other together.
As described above as it can be seen that in the case where large numbers of springs 100 such as the application are stacked upon, due to
The structure of the bending part 131 of inner hook part 130, any two spring will not all be mutually clamped overlapping.In this way, making on electric tool
When with this spring come work, eliminates their separated work, improve work efficiency.Also, the structure of inner hook part 130
The torque that spring 100 is generated in torsion is not changed.That is, the spring force of spring 100 is constant, to which spring 100 is electricity
The pressing force that power driven tools provide also does not change.
Fig. 3 shows the structural schematic diagram of the spring of another embodiments possible according to the present invention.Bullet shown in Fig. 3
Be only that the structure of the inner hook part 130 ' of spring 100 ' in place of the difference of spring 100 ' and spring 100 shown in Fig. 2, other parts with
Spring 100 shown in FIG. 1 is identical.For the sake of clarity, which is not described herein again.In the realization method, inner hook part 130 ' it is curved
The end P2 of folding part 131 ' and the radial distance between position of the innermost circle 112 of spiral structure are less than the material of spring 100 '
The thickness of material, even zero.That is, the structure of inner hook part 130 ' makes it with the innermost circle of spring between position
Radial distance is sufficiently small (at least below the thickness of the material of spring), so that this distance (gap) can not be caught in another bullet
Spring, as a result, when multiple this springs are put together, they are not in the problem of engaging with each other together.
As described above as it can be seen that in the case where large numbers of springs 100 such as the application are stacked upon, due to
The structure of the bending part 131 ' of inner hook part 130 ', any two spring will not all be mutually clamped overlapping.In this way, on electric tool
When carrying out work using this spring, eliminates their separated work, improve work efficiency.Also, inner hook part 130 '
Structure does not change the torque that spring 100 is generated in torsion.That is, the spring force of spring 100 is constant, to spring 100
Also do not change for the pressing force that electric tool provides.
Certainly, in some implementations, the inner hook part of spring can also be configured to：The inflection point of its bending part with spiral
The radial distance between position of the innermost circle of structure is less than the material thickness of spring, and the end of its bending part and disk
The radial distance between position of the innermost circle of rotation structure is less than the thickness of the material of spring.That is, in some realities
In existing mode, the structure of the inner hook part of spring 100 is configured such that there are spring 100 two or more to be less than spring
The space loss portion 113 of the thickness of 100 material.
Fig. 4 shows the structural schematic diagram of the spring of another embodiments possible according to the present invention.Bullet shown in Fig. 4
Be only that the structure of the inner hook part 130 " of spring 100 " in place of the difference of spring 100 " and spring 100 shown in Fig. 2, other parts with
Spring 100 shown in FIG. 1 is identical.For the sake of clarity, which is not described herein again.In the realization method, inner hook part 130 " is most
Inner round portion has protrusion 132.The protrusion 132 from 112 somewhere of innermost circle, protrude outward by (direction far from the center of circle), so that
Obtain the thickness that the radial distance between position that the protrusion 132 adjacent thereto one is enclosed is less than the material of the spring.Also
It is to say, protrusion 132 makes spring 100 have sufficiently small gap (at least below the thickness of the material of spring), so that this
Gap can not be caught in another spring, and as a result, when multiple this springs are put together, they are not in engage with each other
Together the problem of.Also, the structure of inner hook part 130 " does not change the torque that spring 100 is generated in torsion.That is, spring
100 spring force is constant, to which spring 100 is that the pressing force that electric tool provides also does not change.
It should be appreciated that can also otherwise be configured according to the inner hook part of the spring of the application.Inner hook part it is various
Configuration mode does not change the torque that spring 100 is generated in torsion or does not change the torsion that spring 100 is generated in torsion as possible
Square.That is, the various configuration modes of inner hook part can not change the spring force of spring, to which spring is carried by electric tool
The pressing force of confession can not change.
In some embodiments, it is wind spring according to the spring of the application, for example, plane scroll spring.
It should be appreciated that the adjustment of adaptability can be carried out according to application according to the various pieces of the spring of the application.
To those skilled in the art, the spring of the application can be applied to need this spring electric tool, example
Such as, angle grinder etc..
Although describing the application herein with reference to specific embodiment, scope of the present application is not limited to shown
Details.Without departing from the basic principle of the application, various modifications can be made for these details.
Claims (10)
1. a kind of spring (100) for electric tool, which is characterized in that the spring (100) includes：
Ontology (110) comprising the spiral structure of multi-turn and the inner hook part being connect with the innermost circle (112) of the spiral structure
(130), it is used to the spring (100) being fixed to the electric tool；
Outer hook portion (120) connect with the outmost turns (111) of the spiral structure, for providing pressing for the electric tool
Power；
Wherein, there is the thickness of the material more than the spring (100) between the opposed position of adjacent turn of the ontology (110)
Gap, the ontology (110) have the thickness of the material less than the spring (100) at least at one between the opposed position of adjacent turn
The space loss portion (113) of degree.
2. spring (100) according to claim 1, which is characterized in that the space loss portion (113) is configured as：Institute
Stating the gap between the two adjacent rings of the spiral structure of multi-turn has the clearance portion of thickness for the material for being less than the spring (100)
Point, the independent process other than the curling process that the space loss portion (113) passes through ontology (110) is formed.
3. spring (100) according to claim 2, which is characterized in that the space loss portion (113) passes through sleeving and riveting process
Or wide-angle bending process is formed.
4. spring (100) according to any one of claim 1 to 3, which is characterized in that the inner hook part (130) includes
In the bending part (131) that the at one end bending of the innermost circle (112) is formed, the space loss portion (113) is configured as：
The inflection point (P1) of the bending part (131) and the radial distance between position of the innermost circle (112) are less than described
The thickness of the material of spring (100).
5. spring (100) according to any one of claim 1 to 3, which is characterized in that the space loss portion (113)
It is configured as：The end of the bending part (131) and the radial distance between position of the innermost circle (112) are less than institute
State the thickness of the material of spring (100).
6. spring (100) according to any one of claim 1 to 3, which is characterized in that the institute of the inner hook part (130)
Stating innermost circle part has raised (132), and the radial distance between position of protrusion (132) circle adjacent thereto is small
In the thickness of the material of the spring (100).
7. spring (100) according to any one of claim 1 to 3, which is characterized in that the outer hook portion (120) is V-arrangement
Outer hook portion has reversed bending part (121), the spiral structure of the multi-turn, the interior hook in the end of the outer hook portion (120)
Portion (130), the outer hook portion (120) and the reversed bending part (121) are formed as one formula structure.
8. the spring (100) according to any one of claim 1-7, which is characterized in that the spring (100) is planar vortex
Coil spring.
9. a kind of electric tool, which is characterized in that the electric tool includes the spring as described in any one of claim 1-7
(100), the spring (100) provides pressing force for the carbon brush in the electric tool.
10. electric tool according to claim 9, which is characterized in that the electric tool is angle grinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810559123.7A CN108488285A (en) | 2018-06-01 | 2018-06-01 | Electric tool and its spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810559123.7A CN108488285A (en) | 2018-06-01 | 2018-06-01 | Electric tool and its spring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108488285A true CN108488285A (en) | 2018-09-04 |
Family
ID=63341821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810559123.7A Pending CN108488285A (en) | 2018-06-01 | 2018-06-01 | Electric tool and its spring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108488285A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09257070A (en) * | 1996-03-21 | 1997-09-30 | Hayashi Spring Seisakusho:Kk | Spiral spring |
| CN102203453A (en) * | 2008-09-22 | 2011-09-28 | 日本泰克尼卡株式会社 | Spiral spring |
| CN203756826U (en) * | 2014-01-20 | 2014-08-06 | 浙江汇泽机械科技有限公司 | Easily assembled volute spiral spring |
| CN104067019A (en) * | 2012-01-25 | 2014-09-24 | 中央发条株式会社 | Spiral spring |
| DE102013226137A1 (en) * | 2013-12-17 | 2015-06-18 | Schaeffler Technologies AG & Co. KG | Spiral spring winding with partially different winding spacings for local elimination of the winding contact of the individual windings |
| CN104879408A (en) * | 2015-06-18 | 2015-09-02 | 上海协力卷簧制造有限公司 | Contact flat spiral spring device |
| CN205956275U (en) * | 2016-08-17 | 2017-02-15 | 诸暨市康宇弹簧有限公司 | Spiral spring |
| CN205978213U (en) * | 2016-07-25 | 2017-02-22 | 重庆长安汽车股份有限公司 | Coil spring underlay structure |
| CN206889543U (en) * | 2017-07-07 | 2018-01-16 | 泰州市创新电子有限公司 | A kind of multilaminate coiled spring and its lifting support |
| CN208331072U (en) * | 2018-06-01 | 2019-01-04 | 博世电动工具（中国）有限公司 | Electric tool and its spring |
-
2018
- 2018-06-01 CN CN201810559123.7A patent/CN108488285A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09257070A (en) * | 1996-03-21 | 1997-09-30 | Hayashi Spring Seisakusho:Kk | Spiral spring |
| CN102203453A (en) * | 2008-09-22 | 2011-09-28 | 日本泰克尼卡株式会社 | Spiral spring |
| CN104067019A (en) * | 2012-01-25 | 2014-09-24 | 中央发条株式会社 | Spiral spring |
| DE102013226137A1 (en) * | 2013-12-17 | 2015-06-18 | Schaeffler Technologies AG & Co. KG | Spiral spring winding with partially different winding spacings for local elimination of the winding contact of the individual windings |
| CN203756826U (en) * | 2014-01-20 | 2014-08-06 | 浙江汇泽机械科技有限公司 | Easily assembled volute spiral spring |
| CN104879408A (en) * | 2015-06-18 | 2015-09-02 | 上海协力卷簧制造有限公司 | Contact flat spiral spring device |
| CN205978213U (en) * | 2016-07-25 | 2017-02-22 | 重庆长安汽车股份有限公司 | Coil spring underlay structure |
| CN205956275U (en) * | 2016-08-17 | 2017-02-15 | 诸暨市康宇弹簧有限公司 | Spiral spring |
| CN206889543U (en) * | 2017-07-07 | 2018-01-16 | 泰州市创新电子有限公司 | A kind of multilaminate coiled spring and its lifting support |
| CN208331072U (en) * | 2018-06-01 | 2019-01-04 | 博世电动工具（中国）有限公司 | Electric tool and its spring |
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