CN102689293A - Power tool - Google Patents

Power tool Download PDF

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Publication number
CN102689293A
CN102689293A CN2012100347319A CN201210034731A CN102689293A CN 102689293 A CN102689293 A CN 102689293A CN 2012100347319 A CN2012100347319 A CN 2012100347319A CN 201210034731 A CN201210034731 A CN 201210034731A CN 102689293 A CN102689293 A CN 102689293A
Authority
CN
China
Prior art keywords
main shaft
inner part
tool
disk
nut
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
Application number
CN2012100347319A
Other languages
Chinese (zh)
Inventor
沼田文年
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Makita Corp
Original Assignee
Makita Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Makita Corp filed Critical Makita Corp
Publication of CN102689293A publication Critical patent/CN102689293A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00—Means for securing grinding wheels on rotary arbors

Abstract

It is an object of that present invention to provide a kind of electric tools, and when inner part to be mounted on main shaft, the nut part screwed on main shaft when can prevent brake apparatus from working generates loosening. Grinder (1) has the tool body (10) including brake apparatus (50), equipped with inner part and it is integrally formed with the main shaft (16) of pressing portion and is stretched out from tool body, it is pushed under the action of in the braking that brake apparatus carries out main shaft, inner part is in pressing portion to the head end of main shaft, the head end of main shaft screws nut part (40), the disk-like tool (45) that inner part is passed perpendicularly through with nut part gripper spindle. Inner part is made of locking component (20) with the inner flange (30) passed through by main shaft, locking component is interfered with pressing portion when above-mentioned braking occurs and is pushed to disk-like tool, inner flange is mounted on locking component, it is rotated together with locking component, and disk-like tool is clamped in it between nut part.

Description

Electric tool
Technical field
The present invention relates to a kind of electric tool, it has main shaft, through nut part disk-like tool is installed at the head end of main shaft.
Background technology
Generally speaking, have main shaft and the brake apparatus that is used for main shaft is braked, on the head end of the main shaft that stretches out from the main body of electric tool, disk-like tool is installed with nut part as one of electric tool routine grinder.Yet, have on the grinder of brake apparatus,, brake apparatus might make nut part loosening when carrying out work; In order to prevent the generation of such problem; In patent documentation 1, record a kind of like this technology: have on the grinder of brake apparatus, the head end of main shaft passes disk-like tool, and; On main shaft; In the distolateral nut part that screwing of the main tapping of disk-like tool, dispose inner part in the grinder main body side of disk-like tool, this inner part has the function that prevents that nut part is loosening; Grasp disk-like tool by this inner part and nut part, thereby can prevent that nut part is to the rotation of loosening direction when brake apparatus is worked.
On this grinder; On inner part, be provided with the 1st wedging mechanism with the function that prevents that nut part is loosening; On main shaft, be provided with the 2nd wedging mechanism, the mutual sliding-contact of the 1st wedging mechanism and the 2nd wedging mechanism, thus this inner part is pressed to the disk-like tool thruster; Thereby, thereby can prevent that nut part from rotating to loosening direction through this disk-like tool pushing nut part.
The prior art document
Patent documentation
Patent documentation 1: No. the 1663574th, EUROPEAN PATENT OFFICE's patent
Yet, in the prior art,, generally all be with the inner part of inner flange etc. and nut part is clamped disk-like tool and disk-like tool is fixed on the main shaft as the installation method that disk-like tool is installed on the main shaft.Therefore; For as the technology of patent documentation 1 record; The structure of the inner part with the function that prevents that nut part from coming off is installed, the user might install other again owing to error between the inner part of being with anti-drop function and disk-like tool inner part on main shaft.
If other inner part is installed between the inner part and disk-like tool of band anti-drop function owing to slip up; So; When brake apparatus is worked; These other inner part can hinder the inner part of band anti-drop function to the disk-like tool side shifting, can not prevent the loosening of nut part thereby might cause.
Summary of the invention
In view of this, proposed the present invention, the objective of the invention is to, a kind of electric tool is provided, this electric tool need be installed inner part earlier on main shaft, and the nut part that screws in the time of can preventing brake apparatus work like this on main shaft produces loosening.
For achieving the above object, the present invention adopts following technical scheme:
Technical scheme 1: a kind of electric tool; It has tool body, has brake apparatus in the tool body, is extended with main shaft from tool body; On main shaft, be provided with inner part; On main shaft, be provided with pushing portion integratedly, during the braking main shaft carried out by said brake apparatus, said inner part is pressed by the head end thruster to said main shaft under the effect of said pushing portion; Head end at said main shaft can screw nut part, can be by said inner part and said nut part clamping by the disk-like tool that said main shaft vertically passes.Said inner part is made up of the 1st inner part and the 2nd inner part; Said the 1st inner part when above-mentioned braking takes place in the effect of said pushing portion down by to said disk-like tool thruster pressure; Said the 2nd inner part is passed by said main shaft; Be installed on said the 1st inner part and can unload, and, under the state that is installed on said the 1st inner part; Can rotate with said the 1st inner part, and can said disk-like tool be clamped between itself and the said nut part.
Technical scheme 2: on the basis of the structure of technical scheme 1 described electric tool, be formed with plane truncation portion in the periphery of said the 1st inner part, said plane truncation portion is parallel with the direction perpendicular to the axis of said main shaft.
Technical scheme 3: on the basis of the structure of technical scheme 1 or 2 described electric tools; Said pushing portion forms pair of flanges portion; This pair of flanges portion is along the radially protrusion of said main shaft; And the two is positioned at the axis of said main shaft is the center symmetric position at center, and said pair of flanges portion forms the pushing face that the 1st inner part is pushed with said the 1st inner part surface vis-a-vis.On said the 1st inner part, be formed with chimeric recess, said pair of flanges portion is embedded in this chimeric recess with loosening state, the bottom surface of this chimeric recess for the face that is urged of said pushing face butt.
Effect of the present invention
Adopt technical scheme 1 described electric tool; Owing to an original isolation of components being become to be used for the 1st locking inner part of nut part and being used for disk-like tool is installed in the 2nd inner part on the main shaft; Thereby can discern easily be used for the locking parts of nut part be used for the disk-like tool mounted component, thereby can prevent because the error and two the 2nd inner part are installed on the main shaft.Therefore, when by brake apparatus main shaft being braked, thereby the locking functions that the 1st inner part is brought into play nut part reliably stops the nut part generation loosening.
Adopt claim 2, thereby can only in the truncation portion of the plane of the 1st inner part that receives the main shaft effect, can prevent the rotation of main shaft through making the spanner card.Thereby, can easily the 1st inner part be installed in and perhaps be unloaded from it on the main shaft of spline.Grasp disk-like tool and it is installed in the efficient of the installation exercise on the main shaft thereby can improve respectively with the 2nd inner part and the 1st inner part, and the field-strip efficient that disk-like tool is unloaded from main shaft with the 1st inner part.
Adopt technical scheme 3; Embed under the state in the chimeric recess of the 1st inner part at flange part; The rotation of main shaft can be passed on the 1st inner part; Can bear the inertial force of disk-like tool by the integral body that embeds the flange part in the chimeric recess, concentrate and act on the part of flange part the damage that can suppress to produce on the flange part thereby can suppress this inertial force.
Description of drawings
Fig. 1 is the longitudinal section of the part of the grinder of the specific embodiment of the invention;
Fig. 2 is the decomposition chart of main shaft, locking parts and inner flange;
Fig. 3 is the overview of main shaft;
Fig. 4 is the enlarged drawing at A place among Fig. 3;
Fig. 5 is the vertical view of locking parts;
Fig. 6 is the cutaway view along B-B line among Fig. 5.
Description of reference numerals
1 grinder; 10 housings; 11 motor shells; 15 transmission mechanism shells; 16 main shafts; 16A, 16B flange part; The inclined-plane of 19A, 19B flange part; 20 locking parts; 21 plane truncation portions; 22 chimeric recesses; The inclined-plane of 24A, the chimeric recess of 24B; 30 inner flanges; 40 lock-nuts; 45 discoid emery wheels; 50 brake apparatus.
The specific embodiment
Describe with reference to Fig. 1～Fig. 6 specific embodiments of the invention below.As shown in Figure 1, grinder 1 has housing 10, locking parts 20, inner flange 30, lock-nut 40, brake apparatus 50.In addition, grinder 1 is an example of electric tool of the present invention.
Housing 10 is made up of with transmission mechanism shell 15 motor shell 11 of tubular.In motor shell 11, receive and adorning motor M.The rotating shaft 12 of motor M is bearing in the motor shell 11 through bearing 13 and can rotates.Head end in rotating shaft 12 is provided with the 1st bevel gear 14.
Transmission mechanism shell 15 is assembled in the place ahead of motor shell 11.Above-mentioned rotating shaft 12 is stretched in the transmission mechanism shell 15 from motor shell 11.In transmission mechanism shell 15, main shaft 16 with the state support that can rotate, and this main shaft 16 is vertical with rotating shaft 12 through bearing 17.The 2nd bevel gear 18, the 2 bevel gears 18 and 14 engagements of the 1st bevel gear are installed on the top of main shaft 16, thereby the rotation of rotating shaft 12 is passed on the main shaft 16.Stretch out to the below of transmission mechanism shell 15 lower end of main shaft 16, is formed with the 16A of pair of flanges portion, 16B and external thread part 16C at the extension that stretches out from transmission mechanism shell 15 of main shaft 16.Housing 10 is an example of tool body of the present invention.
Like Fig. 2 and shown in Figure 3, the 16A of pair of flanges portion, 16B be radially outstanding along main shaft 16 respectively, and the two axis with main shaft 16 is that the center is centrosymmetric, and the 16A of this pair of flanges portion, 16B are integrally formed on the main shaft 16.Like Fig. 3 and shown in Figure 4, the lower surface of the 16A of pair of flanges portion, 16B forms inclined-plane 19A, the 19B that is predetermined angular with respect to the plane perpendicular to the axis of main shaft 16.
Locking parts 20 are discoid parts, and like Fig. 2, Fig. 5 and shown in Figure 6, it has plane truncation portion 21 and chimeric recess 22.Plane truncation portion 21 is formed on the outer peripheral face of locking parts 20, on the direction perpendicular to the axis of main shaft 16, is positioned at both sides, extends in parallel to each other.Chimeric recess 22 openings are at the upper surface of locking parts 20, and above-mentioned flange part 16A, 16B can embed in this chimeric recess 22 and loosening (rotating with certain degree) can be arranged on direction of rotation.The bottom surface central authorities of chimeric recess 22 are provided with the insertion through hole 23 that the lower end that supplies main shaft 16 is inserted through.
In addition, be provided with inclined- plane 24A, 24B in the bottom surface of chimeric recess 22, this inclined- plane 24A, 24B can be in contact with one another with inclined-plane 19A, 19B under the state that flange part 16A, 16B is embedded in the chimeric recess 22.Here, inclined-plane 19A, 19B in the formation position of the lower surface of flange part 16A, 16B are, under the state that flange part 16A, 16B is embedded in the chimeric recess 22, with inclined- plane 24A, 24B position vis-a-vis.In addition, be formed with protuberance 25 outstanding below locking parts 20, insert through hole 23 and run through this protuberance 25 at the lower surface of locking parts 20.
As shown in Figure 2, inner flange 30 is the disc-shaped part bigger than the diameter of locking parts 20, and it has groove 31 and through hole 32.Groove 31 extends on the direction perpendicular to the axis of main shaft 16.Thereby the protuberance 25 of locking parts 20 is fastened in the groove 31 and can inner flange 30 be installed on the locking parts 20, on the contrary, remove this engaging and then can inner flange 30 be unloaded from locking parts 20.Under the state that inner flange 30 is assembled on the locking parts 20, also be inserted through through hole 32 and pass inner flange 30 thereby be inserted in the main shaft 16 that inserts in the through hole 23.
As shown in Figure 1, screw mutually with the screw (not shown) of lock-nut 40 through making external thread part 16C, thereby can lock-nut 40 be installed in the head end of main shaft 16.Discoid emery wheel 45 can make main shaft 16 pass with main shaft 16 perpendicularly.Thereby the inner flange 30 that this emery wheel 45 is assembled on the locking parts 20 is fixed on the main shaft 16 with lock-nut 40 clampings that are installed in the head end of main shaft 16.The safety guard 46 that the rear section of emery wheel 45 is installed in the below of transmission mechanism shell 15 covers.In this embodiment,, also can with lock-nut 40 clamping emery wheels 45 emery wheel 45 be fixed on the main shaft 16 by locking parts 20 even inner flange 30 is not assembled on the locking parts 20.Emery wheel 45 is an example of disk-like tool of the present invention, and lock-nut 40 is an example of nut part of the present invention, and in addition, locking parts 20 are an example of the 1st inner part of the present invention, and inner flange 30 is an example of the 2nd inner part of the present invention.
Thereby brake apparatus 50 is used for through the rotating shaft 12 of motor M is braked main shaft 16 being stopped the rotation, and it is contained in the place ahead part in the motor shell 11 by receipts.As shown in Figure 1, brake apparatus 50 has keep plate 51, brake component 52, helical spring B.
Keep plate 51 is installed in the rotating shaft 12 on whole circumference, being formed with the cylindrical body of discoideus flange part.Brake component 52 is disposed at the place ahead of axis direction of the rotating shaft 12 of keep plate 51.With the back surface of keep plate 51 brake component 52 vis-a-vis on fixing brake shoe 53.Helical spring B is installed in the motor shell 11, and brake component 52 is loaded to the direction that itself and keep plate 51 are connected.Link with making operation to the driving switch (not shown) of motor M; Brake component 52 leaves keep plate 51; Link with opening operation to driving switch; Brake shoe 53 is being pressed against on the keep plate 51 under the effect of the active force of helical spring B tightly, thereby rotating shaft 12 and main shaft 16 are stopped.
Action in the face of grinder 1 describes down.Will emery wheel 45 being fixed on 16 last times of main shaft, at first, make main shaft 16 pass the insertion through hole 23 of locking parts 20, flange part 16A, 16B are embedded in the chimeric recess 22 of locking parts 20, make inclined-plane 19A, 19B and inclined- plane 24A, 24B butt.With C shape back-up ring locking parts 20 are being installed on the main shaft 16 under the state of anticreep.Afterwards, after making main shaft 16 pass the through hole 32 of inner flange 30, the protuberance 25 of locking parts 20 is fastened in the groove 31 of inner flange 30, thereby inner flange 30 is assembled on the locking parts 20.And then, make main shaft 16 pass emery wheel 45, lock-nut 40 is screwed on main shaft 16, by inner flange 30 and lock-nut 40 clamping emery wheels 45.
Afterwards, motor M is driven, thereby the rotation of rotating shaft 12 is passed on the main shaft 16, so main shaft 16 is to the direction rotation that lock-nut 40 is screwed.At this moment because be in flange part 16A, 16B embeds the state in the chimeric recess 22, thereby flange part 16A, the side surface of 16B and the inner surface 22A (with reference to Fig. 5) of chimeric recess 22 connect, the rotation of main shaft 16 is passed on the locking parts 20.Owing on locking parts 20, assembling inner flange 30, thereby inner flange 30 is with locking parts 20 rotations.
On the other hand; The driving of motor M is stopped; Then the brake shoe 53 of brake apparatus 50 presses against on the keep plate 51; Thereby by the moment of torsion opposite the rotation of rotating shaft 12 is stopped with the direction of rotation of rotating shaft 12, so, because under action of inertia and the emery wheel that will continue to rotate 45 has produced its loosening power (power of loosening direction) that makes on lock-nut 40 with the friction of lock-nut 40.
Yet; The inclined-plane 24A of the inclined-plane 19A of flange part 16A, 16B, 19B and locking parts 20,24B sliding-contact, inclined-plane 19A, 19B press to emery wheel 45 1 thrusters inclined- plane 24A, 24B, accompany therewith; The inner flange 30 that is assembled on the locking parts 20 is pressed to emery wheel 45 1 thrusters; Thereby inner flange 30 stops the effect (locking gear) of lock-nuts 40 to loosening direction rotation through emery wheel 45 pushing lock-nuts 40 thereby locking parts 20 are brought into play.Flange part 16A, 16B are an example of pushing of the present invention portion, and inclined-plane 19A, 19B are an example of the pushing face that the 1st inner part is pushed of the present invention, and inclined- plane 24A, 24B are an example that is urged face of the present invention.
In addition, thus for example make the spanner card end the rotation that in the plane truncation portion 21 of the locking parts of installing on the main shaft 16 20, can prevent main shaft 16.Thereby, for example when needing owing to wearing and tearing to change emery wheel 45,, can easily lock-nut 40 be installed on the main shaft 16 and perhaps unload from it, thereby can successfully change emery wheel 45 for the main shaft that can not rotate 16.
< effect of this embodiment >
On the grinder 1 of this embodiment; Owing to an original isolation of components being become to be used for the locking locking parts 20 of lock-nut 40 and being used for emery wheel 45 is fixed on the inner flange 30 on the main shaft 16; Thereby can discern locking parts that are used for lock-nut 40 and the fixing parts that are used for emery wheel 45 easily, thereby can prevent two flanges 30 to be installed on the main shaft 16 owing to slip up.Therefore, when by brake apparatus 50 main shaft 16 being stopped, thereby the locking functions that locking parts 20 are brought into play lock-nut 40 reliably stops lock-nut 40 generations loosening.
In addition, thus through making the spanner card end the rotation that in the plane truncation portion 21 of the locking parts of installing on the main shaft 16 20, can prevent main shaft 16.Thereby, can easily lock-nut 40 be installed in and perhaps be unloaded from it on the main shaft 16 of spline.Grasp emery wheel 45 and be fixed in the efficient of the installation exercise on the main shaft 16 thereby can improve respectively with inner flange 30 and lock-nut 40, and the field-strip efficient that emery wheel 45 is unloaded from main shaft 16 with lock-nut 40.
In addition; Embed under the state in the chimeric recess 22 of locking parts 20 at flange part 16A, 16B; The rotation of main shaft 16 is passed on the locking parts 20; By embed the flange part 16A in the chimeric recess 22, the integral body of 16B is born the inertial force of emery wheel 45, concentrates and acts on the part of flange part 16A, 16B thereby can suppress this inertial force, can suppress the damage of flange part 16A, the last generation of 16B.
The present invention is not limited to above-mentioned embodiment, can in the scope that does not break away from purport spirit of the present invention, the part to structure carry out suitable change.For example, can on inner flange 30, recess be set and replace above-mentioned groove 31, be entrenched in this recess through the protuberance 25 that makes locking parts 20 and inner flange 3 is installed on the locking parts 20.In addition; Also can be different with above-mentioned embodiment; Respectively form on the inner flange 30 to above outstanding protuberance, on locking parts 20, form and engage the groove of (also can engagement release), thereby also can inner flange 30 be installed on the locking parts 20 with above-mentioned protuberance.
In addition, locking parts 20 also can not have plane truncation portion 21, and brake apparatus 50 also can be for making the electric brake of motor M braking.In addition, in the above-described embodiment, illustrative is that the present invention is applicable on the grinder, yet is not limited in this, also can the present invention be applicable on the electric tool of sander etc.

Claims (3)

1. electric tool, it has tool body, has brake apparatus in the tool body; Be extended with main shaft from tool body, on main shaft, be provided with inner part, on main shaft, be provided with pushing portion integratedly; During the braking main shaft carried out by said brake apparatus; Said inner part is pressed by the head end thruster to said main shaft under the effect of said pushing portion, can screw nut part at the head end of said main shaft, can be by said inner part and said nut part clamping by the disk-like tool that said main shaft vertically passes; It is characterized in that
Said inner part is made up of the 1st inner part and the 2nd inner part; Said the 1st inner part when above-mentioned braking takes place in the effect of said pushing portion down by to said disk-like tool thruster pressure; Said the 2nd inner part is passed by said main shaft; Be installed on said the 1st inner part and can unload, and, under the state that is installed on said the 1st inner part; Can rotate with said the 1st inner part, and can said disk-like tool be clamped between itself and the said nut part.
2. electric tool according to claim 1 is characterized in that, is formed with plane truncation portion in the periphery of said the 1st inner part, and said plane truncation portion is parallel with the direction perpendicular to the axis of said main shaft.
3. electric tool according to claim 1 and 2 is characterized in that,
Said pushing portion forms pair of flanges portion; This pair of flanges portion is along the radially protrusion of said main shaft; And the two is positioned at the axis of said main shaft is the center symmetric position at center; Said pair of flanges portion forms the pushing face that the 1st inner part is pushed with said the 1st inner part surface vis-a-vis
On said the 1st inner part, be formed with chimeric recess, said pair of flanges portion is embedded in this chimeric recess with loosening state, the bottom surface of this chimeric recess for the face that is urged of said pushing face butt.
CN2012100347319A 2011-03-23 2012-02-15 Power tool Pending CN102689293A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011064688A JP2012200794A (en) 2011-03-23 2011-03-23 Electric tool
JP2011-064688 2011-03-23

Publications (1)

Publication Number Publication Date
CN102689293A true CN102689293A (en) 2012-09-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012100347319A Pending CN102689293A (en) 2011-03-23 2012-02-15 Power tool

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US (1) US20120244788A1 (en)
EP (1) EP2502704A1 (en)
JP (1) JP2012200794A (en)
CN (1) CN102689293A (en)
RU (1) RU2012111083A (en)

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CN107471044A (en) * 2016-06-08 2017-12-15 南京德朔实业有限公司 Hand held electric tool
CN110177659A (en) * 2017-01-13 2019-08-27 株式会社牧田 Electric tool
CN110785265A (en) * 2017-07-14 2020-02-11 株式会社牧田 Rotary tool

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US8942650B2 (en) 2010-04-20 2015-01-27 Rf Micro Devices, Inc. RF PA linearity requirements based converter operating mode selection
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US11396078B2 (en) * 2019-06-10 2022-07-26 Makita Corporation Grinder
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CN107471044A (en) * 2016-06-08 2017-12-15 南京德朔实业有限公司 Hand held electric tool
CN110177659A (en) * 2017-01-13 2019-08-27 株式会社牧田 Electric tool
CN110785265A (en) * 2017-07-14 2020-02-11 株式会社牧田 Rotary tool
US11426838B2 (en) 2017-07-14 2022-08-30 Makita Corporation Rotating tool
CN110785265B (en) * 2017-07-14 2023-03-14 株式会社牧田 Rotary tool

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Publication number Publication date
EP2502704A1 (en) 2012-09-26
RU2012111083A (en) 2013-09-27
US20120244788A1 (en) 2012-09-27
JP2012200794A (en) 2012-10-22

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Application publication date: 20120926