Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Electric tool

A technology of electric tools and tool heads, which is applied in the technical field of vibration and can solve the problems of reducing the vibration amount of dynamic shock absorbers and the like

Inactive Publication Date: 2004-10-06
MAKITA CORP
View PDF1 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, in the actual operation of using the power tool, the user who holds the power tool is likely to force the power tool against the workpiece (work piece) to perform work on the workpiece
In this case, although vibration damping is highly desirable, the amount of vibration input to the dynamic damper may be reduced due to the user's force to press the power tool against the workpiece

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electric tool
  • Electric tool
  • Electric tool

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0092] now refer to Figure 1 to Figure 5 A first embodiment of the present invention is described. What will be described is an electric hammer as a typical example of the electric power tool of the present invention. Such as figure 1 As shown, a typical electric hammer 101 according to the present embodiment includes a body 103; a tool holder 117, which is connected to the end region of the body 103; and a hammer bit 119, which is detachably connected to the tool holder On the holder 117. The hammer bit 119 is a feature corresponding to the "tool bit" of the present invention.

[0093] The body 103 includes a motor housing 105 housing a drive motor 111 , a gear housing 107 housing a motion converting mechanism 113 and an impact element 115 , and a handle 109 . The motion conversion mechanism 113 is adapted to properly convert the rotational output of the drive motor 111 into linear motion, which is then transmitted to the impact member 115 . Thus, an impact force is gen...

no. 2 example

[0112] now refer to Image 6 with Figure 7 A second embodiment of the present invention is described. In the second embodiment, the balance weight 245 of the dynamic vibration absorber 241 can be actively driven only in the case of load driving where a load is applied to the hammer bit 219 from the workpiece side. For this reason, on the periphery of the cylinder 229, a cylindrical action member 261 and a biasing spring 263 are installed.

[0113] exist Image 6In , the hammer 201 is shown in a no-load driven state, ie no load is applied to the hammer bit 219 from the workpiece side. At this time, as shown in the figure, the action member 261 is pressed to the left by the bias spring 263 . In this state, the action member 261 closes a first communicating portion 255 connecting a first action chamber 251 of the dynamic shock absorber 241 and the crank chamber 221 . The action member 261 also closes a second action chamber 252 communicating with the dynamic shock absorber ...

no. 3 example

[0119] now refer to Figure 8 with Figure 9 A third embodiment of the present invention is described. Similar to the second embodiment, the third embodiment is also configured such that the counterweight 345 of the dynamic damper 341 is actively activated only in the case of load driving when a load is applied to the hammer bit 319 from the workpiece side. to drive. However, the third embodiment is different in configuration from the second embodiment in the communication state of the crank chamber 321 under load and no-load driving. In the hammer 301 of this embodiment, a cylindrical actuator 361 and a bias spring 363 are provided on the periphery of the air cylinder 329 . The crank chamber 321 always communicates with a first action chamber 351 of the dynamic shock absorber 341 through a first communication portion 355 .

[0120] exist Figure 8 , the hammer 301 is shown in an idle drive condition with no load applied to the hammer bit 319 from the side of the workpiec...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

It is an object of the present invention to provide a power tool having a further improved vibration reducing performance. The representative power tool may comprise a tool bit, an actuating mechanism, a dynamic vibration reducer. The actuating mechanism drives the tool bit linearly by means of pressure fluctuations so as to cause the tool bit to perform a predetermined operation. The dynamic vibration reducer has a weight that reciprocates under a biasing force of an elastic element to reduce vibration of the actuating mechanism. The weight may be driven by means of pressure fluctuations caused in the actuating mechanism. According to the invention, the weight of the dynamic vibration reducer can be actively driven by pressure fluctuations in the actuating mechanism for driving the tool bit. Therefore, regardless of the magnitude of vibration acting on the power tool, the dynamic vibration reducer can be forcedly and steadily operated.

Description

technical field [0001] The present application relates to an electric power tool, especially a technology capable of alleviating vibration in electric power tools such as hammers and hammer drills, which linearly drives a hammer drill at a predetermined cycle (hammer bit). Background technique [0002] Japanese Patent Application Publication No. 52-109673 discloses a hammer with a vibration damping device. According to this prior art, a vibration isolation chamber is integrally formed inside the main body housing, and a dynamic vibration reducer is accommodated in the vibration isolation chamber. The dynamic damper performs vibration damping with respect to the amount of vibration input into the dynamic damper. Especially inside the hammer, when the hammer is activated, severe vibrations can be generated in the axial direction of the hammer bit. [0003] In the above dynamic shock absorber, the balance weight is placed under the biasing force of an elastic member. The dy...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B25D11/00B25D11/12B25D17/24
CPCB25D11/125B25D17/245B25D2217/0084B25D2250/371B25D2217/0092B25D2250/231B25D2211/003
Inventor 青木阳之介
Owner MAKITA CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com