CN1306468A

CN1306468A - Pneumatic hand grinding tool

Info

Publication number: CN1306468A
Application number: CN99807765A
Authority: CN
Inventors: 托尔斯滕·桑德尔
Original assignee: EKAMANT AB
Current assignee: EKAMANT AB
Priority date: 1998-06-23
Filing date: 1999-04-23
Publication date: 2001-08-01
Also published as: ID27779A; AU4300499A; CA2334586A1; BR9911410A; US20010005668A1; EP1089853A1; KR20010053133A; JP2002518196A; SE9802220L; SE9802220D0; SE511708C2; WO1999067057A1

Abstract

A pneumatic hand grinding tool has a supporting plate (11) and a compressed-air pipe (4) to be connected to a source of compressed air for driving the supporting plate. The supporting plate (11) has a flat surface to which an abrasive sheet (48) is to be attached by suction. For this purpose the supporting plate has ducts (41, 42, 43, 44, 45) leading into the flat surface, which are connected to an ejector unit (16) that forms a source of suction. The ejector unit (16) is arranged on the tool and has members (21, 47) which connect the ejector unit to the compressed-air pipe (4).

Description

Pneumatic hand grinding tool

The present invention relates to a kind of Pneumatic hand grinding tool, it has a support plate and compressed air piping, and this compressed air piping is connected on the compressed air source, is used to drive support plate, support plate has a smooth surface, and abrasive sheet (abrasive sheet) is fixed on this smooth surface.

For abrasive sheet (so-called herein abrasive sheet refers to sand paper, emery cloth or an analog) is fastened on the support plate, the adhesive abrasive sheet of general now employing, it has the adherence surface, utilizes this adherence surface pasting the flat surfaces of support plate.The price comparison of this adherence plate is expensive and be difficult to processing, because the adherence surface is very sensitive to dust and dirt.In addition, they have limited shelf life (Shelf life), and very sensitive to temperature.

Also having well-known is to utilize so-called Velcro to bring abrasive sheet is fixed on the support plate.Thereby obtain the effectively fixing of abrasive sheet, but it is very expensive to be used for this fixing abrasive sheet price.This class abrasive sheet does not allow the user to change the form of abrasive sheet or obtains the hole of dust.

At last, also having well-known is by abrasive sheet is drawn on the flat surfaces of support plate, abrasive sheet to be fixed on the support plate.For the use of this support plate, can be with common abrasive sheet manufacturing, also in other words, abrasive sheet is without handling with special method (for example, an adherence layer or Velcro band being set).Thereby can carry out the speed and convenience change of abrasive sheet.

In order by suction abrasive sheet to be fixed on the support plate, support plate has the pipeline that leads to flat surfaces, and these pipelines are connected on the suction source.In known means, by suction abrasive sheet is fixed on the support plate, employing one is arranged on the suction source of instrument outside.In this Pneumatic hand grinding tool, therefore on the one hand, must utilize a compressed air piping that instrument is connected on the compressed air source, be used to drive support plate, and on the other hand, each pipeline of support plate must be connected on the suction source by a suction tube.This complicates the use of instrument, and has limited except compressed air source, also can use the use in these places of suction source.

Therefore, the purpose of this invention is to provide a kind of Pneumatic hand instrument, wherein abrasive sheet is fixed on the support plate, and its use is not limited to these places, except compressed air source, also can use suction source in these places by suction.

This purpose utilizes a Pneumatic hand instrument to reach, this Pneumatic hand instrument has a support plate and compressed air piping, compressed air piping is connected on the compressed air source, be used to drive support plate, support plate has a flat surfaces, by suction abrasive sheet is fixed on this flat surfaces, and support plate has the pipeline that is used for this purpose, pipeline leads to flat surfaces, they are connected on the suction source, it is characterized in that according to instrument of the present invention: pipeline is connected on the injection apparatus that forms suction source, and spray device arrangement and has and is used for injection apparatus is connected to device on the compressed air hose on instrument.

In a preferred embodiment, injection apparatus comprises at least two injectors, and they are connected on two pipe-line systems of separating at least, and pipe-line system comprises the pipeline that is connected on the respective injectors.By means of sealing device, the flat surfaces with support plate is divided into several portions easily, and they are separated from each other and are relevant with corresponding pipe-line system.

Illustrate in greater detail the present invention now with reference to accompanying drawing, wherein:

Fig. 1 is the cross-sectional view strength according to hand-controlled grinding of the present invention,

Fig. 2 is an exploded view, and it also illustrates included parts in the instrument according to Fig. 1 with the cross section,

Fig. 3 is the injection apparatus that illustrates on the direction of arrow III in Fig. 2 in the instrument of being configured in,

Fig. 4 is the vacuum distribution that illustrates on the direction of arrow IV in Fig. 2 in the instrument of configuration,

Fig. 5 be illustrate on the direction of arrow V in Fig. 2 in the instrument of being configured in supporting disk and

Fig. 6 illustrates the supporting disk on the arrow VI direction among Fig. 2.

Hand grinding tool shown in Fig. 1 has a shell 1 and a connected handle component 2.This instrument is the pneumatic type operation and an air motor 3 is arranged that this air motor is connected on the compressed air source (not shown) by a compressed air piping 4 that runs through handle component 2.

The output shaft 5 of motor 3 towards the place, end away from motor, has a threaded axial hole at it.The head 7 of bolt 6 forms an escapement and is fastened or connected on the circular metal packing ring 8, and this metal washer 8 will illustrate in greater detail below, this bolt 6 will be screwed in the end hole of axle 5, so that rotate with the axis with packing ring 8.Bolt head 7 also has a threaded axial hole 9 at its free end, and the medium pore of packing ring 8 is arranged to the opposite in hole 9 therewith.Bolt 10 is screwed in the hole 9 of bolt head 7, so that along with the bolt head rotation, and therefore along with motor drive shaft 5 rotations.

One circular supporting disk 11 fixed being connected on the bolt 10, this supporting disk 11 comprises a supporting metal sheets 12 and a rubber slab 13, this rubber slab 13 has some button spares (Knob) towards outside (being down) in Fig. 1.Supporting disk 11 is along with bolt 10 rotation like this, and therefore along with bolt 6 and motor drive shaft 5 rotations.Supporting disk 11 has the rubber edges (skirt) 14 on the circumference, and this rubber edges 14 forms an outside, peripheral sealing lip spare.

The supporting disk 11 concentric types rotation of instrument, and this instrument has an eccentric 15 for this reason, this eccentric belongs to the type of prior art, and therefore is not described further herein.

Instrument has an injection apparatus 16, and this injection apparatus is rotary type not.Be connected on the shell 1, and comprise a snap ring and four injectors 18, this injector 18 is fixed on its periphery.Injector 18 evenly distributes along the periphery of snap ring 17.Injector 18 belongs to general type, and has a straight-through compressed air piping 19 and a connected transverse conduit 20, and this straight-through compressed air piping leads to the inside surface that makes progress, injector 18 footpaths.Compressed air piping 19, is connected on the compressed air source via compressed air piping 4 and connected injector pipeline 21 at one end place.

Snap ring 17 outwardly in the surface of (being down), has concentric groove or

pipeline

22 and 23 of two circles at it in Fig. 1 and 2.

Groove

22 and 23 footpaths are upwards at inner sealing, and three

sealing rings

24,25 and 26 are between them and upwards externally sealing of

footpath.Sealing ring

24,25 and 26 is close to packing ring 8 footpath upwards on the inward-facing surface.Snap ring 17 all has a

pipeline

27,28 facing to each injector 18.This

pipeline

27,28 constitutes the radially extension of injector pipeline 20.Pipeline 27 is communicated with inner circumferential groove 22, and pipeline 28 is shorter than pipeline 27, and it is communicated with outside ring-shaped groove 23.4 injectors 18 wherein 2 in this way be connected on the inner circumferential groove 22, and remaining in addition 2 be connected on the outside ring-shaped groove 23.

Injector device 16 has 4 arms 29, and they stretch out from snap ring 17 diametrically, and at their free end one pin 30 is arranged.Each pin 30 is inserted one fixedly in the respective aperture 31 of lug (1ug) 32, this fixedly lug 32 on shell 1, form.A compression spring 33 respectively is set on each pin 30, is close to the packing ring 8 that rotates with axle 5 so that push down snap ring 17.

Packing ring 8 has two groups of passages 34,35.Therein in one group, passage 34 circle configuration in, circle has and the identical radius of snap ring 17 inner circumferential groove 22 in this, and in another group, passage 35 disposes along a cylindrical, and this cylindrical has the radius identical with the outside ring-shaped groove of snap ring 17 23.The passage 34 of packing ring 8 is provided with facing to the inner circumferential groove 22 of snap ring 17 like this, and its passage 35 is facing to outside ring-shaped groove 23 settings of snap ring 17.Passage 34 is on one side, and passage 35 is at another side, they all be the footpath upwards at inner sealing, three

sealing rings

36,37 and 38 are between them and upwards externally sealing of

footpath.Sealing ring

36,37 and 38 is close to the surface of support plate 12 towards inside.

Support plate 12 has two groups of through holes 39,40.Therein in one group, each hole 39 disposes along an inner circular, and this inner circular has the radius identical with the inner circumferential groove 22 of snap ring 17, and therein in another group, each hole 40 disposes along an outer circle, and this outer circle has the radius identical with the outside ring-shaped groove 23 of snap ring 17.

Rubber slab 13 in the surface of inside, has an inner circular drop-center 41 at it, and it injects a segment distance in the plate.A plurality of holes 42 on the plate 13 are communicated with groove 41, and flat outer surface is led in these holes 42, and they are limited by button spare.Each hole 42 disposes with axle 5 concentric justifying along one.Rubber slab 13 in the surface of inside, also has an outer circular groove 43 and by its outward extending a plurality of groove 44 that directly makes progress, these grooves 44 stop in distance plate 13 peripheral a distance at it.The outer surface of plate 13 is led in a hole 45, and it is communicated with each groove 44 at its place, outer end that directly makes progress.Rubber slab 13 has narrow, a circular continuous part 46, and this continuous part 46 forms a sealing ring on the one hand between the opening in each hole 42, and forms a sealing ring on the other hand between the opening in each hole 45.

With conspicuous, each endoporus 42 of making progress of footpath leads to the flat outer surface of plate 13 as from above, they via groove 41, passage 34, groove 22 and conduit 27 and injector 18 wherein two be communicated with.Each injector 18 formation one is used for the source of suction of pipe-line system, and this pipe-line system is made of hole 42, groove 41, passage 34, groove 22 and pipeline 27.As further conspicuous, the flat outer surface of plate 13 is led in the outer hole 45 that each footpath makes progress, and they are communicated with via two injectors 18 of groove 44, groove 43, passage 35, groove 23 and pipeline 28 and other.The injector 18 of above-mentioned two back forms a source of suction that is used for pipe-line system, and this pipe-line system is made of hole 45, groove 44, groove 43, passage 35, groove 23 and pipeline 28.Two pipe-line systems are separated from each other by sealing

ring

25,37 and 46.Pipe-

line system

27,22,34,41,42 seals on inner radial by sealing

ring

24 and 26, and

pipeline

28,23,35,43,44,45 is by sealing

ring

26 and 38 and the externally upwards sealing of footpath of sealing lip spare, and above-mentioned sealing lip spare forms with rubber exterior edge 14.

Valve 47 is configured in the compressed air piping 4.Valve 47 can be adjusted to the second place from primary importance by a switch (not shown), and be adjusted to the 3rd position via the second place, in above-mentioned primary importance, it stops compressed air supply motor 3 and injector 18, and in said second position, it still stops compressed air supply motor 3, but keeps the connection 21 between compressed air piping 4 and the injector 18 to open wide, in above-mentioned the 3rd position, it allows compressed air supply with injector 18 and motor 3.Nature, valve 47 also can utilize this switch from the 3rd position adjustments to the second place, and be adjusted to primary importance via the latter.

When valve 47 is in its second place, produce swabbing action via two pipe-line systems of separating 27,22,34,41,42 and 28,23,35,43,44,45 at the flat surfaces place of supporting disk 11 like this.By this swabbing action, an abrasive sheet 48 is fixed on the supporting disk 11.Then, valve 47 is adjusted to its 3rd position, motor 3 usefulness compressed air are supplied with, and the abrasive sheet 48 that drives supporting disk 11 and be fixed thereon.

Claims

1. Pneumatic hand grinding tool, it has a support plate (11) and compressed air piping (4), this compressed air piping (4) is connected on the compressed air source, be used to drive support plate (11), this support plate (11) has a flat surfaces, by swabbing action one abrasive sheet (48) is fixed on this flat surfaces, for this reason, support plate (11) has the pipeline (41,42,43 that leads to flat surfaces, 44,45), these pipelines are connected on the suction source (18), it is characterized in that: each pipeline (41,42,43,44,45) be connected on the injection apparatus (16) that forms suction source, spray device arrangement is on instrument, and have the device (21,47) that is used for injection apparatus is connected to compressed air piping (4), so that provide fixing by suction.

2. according to the described instrument of claim 1, it is characterized in that: injection apparatus (16) comprises at least two injectors (18), and they are connected at least two pipe-line systems of separating (27,22,34,41,42 and 28,23,35,43,44,45) on, these pipe-line systems comprise the pipeline (41 that is connected on the respective injectors (18), 42 and 43,44,45).

3. according to the described instrument of claim 2, it is characterized in that: by sealing device (46), the flat surfaces of support plate (11) is divided into several portions, they be separated from each other and with separately pipe-line system (27,22,34,41,42 and 28,23,35,43,44,45) relevant.