CN2073723U - Polishing machine for smoothing surfacing cleaning - Google Patents

Abstract

The utility model relates to a polishing machine for smoothing surfacing cleaning, comprising a miniature motor, a washing disk component, a washing disk cover, a machine casing, a liquid receiver for cleaning liquid, a spraying liquid pressure device, a handle and an adjusting plate for the spraying liquid quantity of cleaning liquid, wherein, the washing disk can be provided with brush bristles or soft cloth. The connecting point of the handle and the machine casing is provided with a universal joint which can automatically spray the liquid and adjust the size of the spraying liquid quantity as well as close spraying of liquid. The utility model is suitable for cleaning window-door glass which is positioned on every direction or the smooth plain faces of a floor, a woodenware surface, a ceramic tile ground (wall) face, etc. The utility model has the advantages of power consumption saving and convenient use.

Description

Smooth flat is cleaned the machine of polishing

The utility model relates to a kind of daily wiping examination equipment, and particularly a kind of smooth flat is cleaned and polished machine, can be used for cleaning and or polish private residence, shop, hotel and vehicle etc. as glass, floor, the smooth flat of woodenware surface and ceramic tile ground (wall) face.

Domestic and international existing friction scrubbing apparatus as windowpane has varied, and their use has all alleviated staff's labour intensity in varying degrees, has improved operating efficiency.But these equipment remain or this or that weak point, and for example, the pneumatic type window-cleaning device (patent No. SU-912-142) of the Soviet Union must be equipped with air pressure pump, thereby complex structure, and equipment is huge, and is big; The structure of the electric window friction scrubbing apparatus (patent No. US4257138) of the U.S. is also complicated, and only is applicable to the lateral surface of wiping large-size glass; Domestic a kind of hand electric window-cleaning device (patent No. CN85201147U) is though with its simple in structure being good at, but also there is it to wait improvements, for example: can not finish the wiping examination and/or the cleaning of windowpane four corners position glass surface simultaneously effectively, lean on manual operation separately; When wiping glass, especially dust and dirt when hairbrush directly contacts glass surface, increases the burden of drive motors more for a long time because of increased force will; And, because of being loaded on cleaning fluid liquid reservoir on the handle by the moving injection apparatus ejection of a long tubule armrest, like this, when wiping the glass that tries than distant location because of need and add long handle, follow the obvious lengthening of long tubule and increased the hydrojet resistance, making influences the hydrojet effect.

The purpose of this utility model is for a kind of equipment is provided, and it not only can overcome the deficiency in the above-mentioned same category of device substantially, and can be used for to as floor except that glass, the polishing of the smooth flat of woodenware surface and ceramic tile ground (wall) face.

For achieving the above object, the utility model spy provides a kind of smooth flat to clean/polish machine, it comprise one its have before and after the micromotor of output, the one brush dish assembly by output driving before the motor reel reaches the brush dish cover in its periphery, one casing at inside installation motor, one cleaning fluid surge drum, one hydrojet pressue device and one is carried the handle of this machine operation, wherein: above-mentioned brush dish assembly comprises that a brush dish and is loaded on the brush dish removably, the brush board of cleaning piece is housed, and the brush dish has an inner fovea part and is opened in the aperture of all symmetrical distributions on the inner fovea part diapire; Above-mentioned brush dish cover is one to be slightly larger than the square case of above-mentioned brush dish circumscribed square, the strong point that the outstanding position of certificate of at least two position consistency and symmetrical distribution is arranged on its every square edge near a side of opening wide of cleaning piece, these strong points are positioned at same level, and be starkly lower than the cleaning piece end, above-mentioned surge drum is an annular cylinder shape structure, it is interior between casing and motor to be loaded on said machine casing, the one end constitutes a scalable portion, can stretch under the external force effect axial along it, its other end near the brush dish is an outlet end; Being loaded in the above-mentioned hydrojet pressue device between the flexible end and bottom of shell of above-mentioned surge drum, is a gear-cam mechanism by the drive of motor reel rear output; This cleaning is polished machine and is also comprised a cleaning fluid spouting liquid adjustable plate, and it is close to the outlet end inwall of above-mentioned surge drum.

In the above-mentioned specific embodiments of the present utility model, wherein: the preceding prominent strong point on the edge, every limit of above-mentioned square brush dish cover can be established two, lay respectively at the position of the respective corners of close cover, and the edge between this two strong point is a recessed inwards circular arc line, and from the direction view over against each angle, each angle is cut out a shape, fritter of the same size, is beneficial to bristle stretches out scrape along glass from the interstice coverage that cuts out fritter respective corners position; Above-mentioned surge drum can partly be combined by an annular canister part and a telescopic annular cylinder shape bellows, on the annular canister part wall outside, be provided with a filling opening, on the outlet end end wall of the close brush dish of its annular canister, along having some equally distributed round tube holes on the excircle on it, other has the identical short tubule of quantity to be fixed on each all through hole, and along also having some equally distributed round tube holes on the inner periphery on it, other has the long tubule that equates with these number of openings to be fixed on each Kong Bingyi end to be inserted in the surge drum suitably distance, above-mentioned these length, the exposed junction of short tubule stretches in the brush dish inner fovea part, so that cleaning fluid can be mapped on glass by all apertures on the brush dish from these pipes; Above-mentioned spouting liquid adjustable plate is the circular sheet that an external diameter is slightly less than surge drum outlet end internal diameter, offer on it quantity and position respectively with the identical and corresponding long waist shaped hole in all holes of surge drum outlet end end wall upper edge cylindrical, one wrench that extends radially surge drum is arranged on the plate, can be by its this plate around its center rotation; Gear-the cam mechanism of above-mentioned composition hydrojet pressue device can comprise a spur gear that is driven by motor reel rear output and one and the duplex spur gear of its engagement, one with the spur gear of duplex spur gear engagement, this spur gear slip cap is loaded on the output of motor reel rear, and be connected with actuating cam that a slip cap is loaded on the motor reel, comprise that also one makes the intermittently inverted cam of engagement with actuating cam, this inverted cam is fixed in the telescopic bellows segment tube wall basal surface of above-mentioned surge drum and is set in slidably on the output of motor reel rear.

In addition, in the above-mentioned specific embodiments of the present utility model, wherein also can install a connecting rod additional between the bottom of shell of handle and above-mentioned all zero parts of installation, connecting rod can be adorned a universal joint and the articulated joint that can tighten or unclamp respectively respectively at the junction between casing and the handle, is beneficial to the glass pane of wiping glass pane lateral surface and wiping arbitrary orientation (the glass ceiling that comprises the level orientation that is positioned at eminence).

Again, in the above-mentioned specific embodiments of the present utility model, wherein the brush dish can be adorned the brush board of band bristle, and the wiping board of the band wiper that also can change the outfit is with polishing after can waxing as the floor, the usefulness of polishing of woodenware surface and ceramic tile ground (wall) face.

Above-mentioned CONSTRUCTED SPECIFICATION of the present utility model and advantage thereof are by being understood easily in conjunction with the detailed description that following embodiment the description of the drawings is done.Wherein accompanying drawing is

Fig. 1 is the longitudinal section of the utility model one embodiment;

Fig. 2 (a), 2 (b) are respectively the front view and the vertical view cutaway drawing of the brush dish among this embodiment;

Fig. 3 (a), 3 (b) be respectively the brush dish cover among this embodiment front view and along the M among Fig. 3 (a) to view;

Fig. 4 (a), 4 (b) are respectively the front view and the vertical view of the cleaning brush plate among this embodiment;

Fig. 5 (a), 5 (b) are respectively the front view of polishing the soft cloth plate and the vertical view of using among the another embodiment;

Fig. 6 (a), 6 (b) are respectively the installation situation of spouting liquid adjustable plate in surge drum and the partial sectional view and the side view of structure thereof among this two embodiment of expression;

Fig. 7 is the schematic diagram of the hydrojet pressue device among this two embodiment; And

Fig. 8 (a), 8 (b) are respectively the actuating cam in the device shown in Figure 7 and the front view of inverted cam.

Now make a detailed description in conjunction with above-mentioned accompanying drawing.

As shown in Figure 1, to clean/polish the composition and the structure thereof of machine as follows for the described smooth flat of present embodiment:

-casing 1;

One micromotor 10, its driving shaft has forward and backward output, and it is installed in the casing 1;

One brush dish assembly 73, it comprises that a brush dish 7 and removably is loaded on the cleaning brush plate 35 on the brush dish 7.Wherein brush dish 7 fixedly is loaded on the preceding output 101 of 10 in motor by its screwed hole of centre.Shown in Fig. 2 (a), 2 (b), this brush dish is an oblong members, its back side has an inner fovea part around the frusto-conical of center hub, stay four spokes 24 behind four 90 ° of covering of the fans of hollow out in the card, respectively offered some roundlet through holes 23 in the long and narrow circular arc interval that is positioned at each covering of the fan district of card by cleaning fluid.The card front is inwards a shallow circular bead surface, for following cleaning brush plate 35 is installed.Shown in Fig. 4 (a), 4 (b), clean brush plate 35 and comprise that mainly an external diameter and thickness just are suitable for being loaded on the sheet member 3 in the shallow shoulder on the card of above-mentioned brush dish 7, it also hollow out four 90 ° of uniform covering of the fan districts, on four that the stay spokes that radially extend, respectively be covered with and cleaned with bristle 5, wherein lean outward and tiltedly stretch out, and its length obviously is longer than the length of the bristle at other position by a part of bristle 5 of outermost.When this cleaning brush plate 35 installed on the brush dish 7, as long as both hollow out fan sections that makes them are aimed at, like this, cleaning fluid can be emitted by above-mentioned all through holes 23, through sector space be sprayed onto wait to clean the windows on;

One spun yarn net baffle plate 2 between above-mentioned brush dish assembly 73 and motor 10, is fixed on the following brush dish case 9, enters motor in order to the dust that blocks under wiping from windowpane, but does not hinder motor heat to shed;

One brush dish case 9, its rear end is fixed on the casing 1.The main body in its place ahead is a square that is slightly larger than the circumscribed square of above-mentioned brush dish 7, on its every square edge two position consistency and symmetrical distribution are arranged near a side of opening wide of bristle 5, as be positioned on the corresponding angular position of covering near dish, the strong point according to outstanding position, eight strong points on these four square limits are positioned at same level, and be starkly lower than the hair end of the middle undercoat part of bristle 5, and between two strong points on same square edge, it then is a recessed inwards circular arc line, and look from the direction over against each angle, each angle is cut out shape fritter of the same size (seeing Fig. 3 (b)).Such structure can make when brush being coiled assembly 73 to be attached to when on glass.Owing to rely on above-mentioned eight supporting roles of the strong point on the glass face of brush dish 7, and not reason brush dish assembly 73 paste tension and increase the burden of motor 10, yet bristle 5 still can stretch out from the arcuate gap band of the four edges of brush dish cover, the long brush hairs that especially can guarantee the outer position in the bristle 5 when cleaning the window-glass four corners position stretches out from the four corners position that the quilt of above-mentioned brush dish cover 9 cuts out fritter, thereby still can clean bight glass effectively;

One cleaning fluid surge drum 13 is annular cylinder shape structures, is loaded in the said machine casing 1 between casing 1 and motor 10, its rear end constitutes a scalable portion, as the telescopic bellows 12 of an annular cylinder shape, all the other major parts are an annular canister 8, both be combined into one surge drums 13.Like this, when along this axially telescopic bellows part 12 outer walls are imposed external force inwards the time, then can be compressed and surge drum 13 volumes are dwindled, after external force disappears, extend reinstatement again by bellows 12 self elastic force.On its lateral wall, establish a filling opening 16, seal with covering to tighten, on the outlet end end wall of the close above-mentioned brush dish 7 of its annular canister part 8, along having some on its periphery as four equally distributed round tube holes, the short tubule 131 that other has quantity to equate with flexible hole count is fixed on each round tube hole, and along also having some equally distributed round tube holes on the circle in it, other has the long tubule 132 that equates with these round tube hole quantity to be fixed in these holes and an end injects in the surge drum 13 to suitable distance, as surpassing half dark place of tube.The exposed junction of above-mentioned these length tubules 132,131 passes above-mentioned baffle plate 2 and stretches in the inner fovea part of above-mentioned brush dish 7, so that cleaning fluid can be mapped on glass by all apertures 23 on the brush dish 7 from these pipes;

One circular spouting liquid adjustable plate 11 (consulting Fig. 6 (a), 6 (b)), it is installed on the outlet end inside of the annular canister part 8 of above-mentioned surge drum 13, and be close to this end inwall, its external diameter is slightly less than the internal diameter of annular canister part 8, offer on it quantity (as four) and position respectively with the identical and corresponding long waist shaped hole 111 of all circular holes of annular canister part 8 outlet end end wall upper edge cylindricals.Have one to extend radially out the wrench of annular canister part 8 on this adjustable plate 11 along it, can make this plate execute commentaries on classics by it around its center, with regulate all long lumbar holes 111 on it with and its corresponding annular canister 8 end walls on the aligned relationship along peripheral all circular holes, thereby regulate spouting liquid;

One hydrojet pressue device 14, it is a gear-cam mechanism that is driven by output behind 10 in the motor, it is interior between the telescopic bellows 14 and casing 1 bottom of surge drum 13 that it is loaded on casing 1, it comprises (see figure 7): a spur gear 141 by 102 drivings of motor shaft rear output, one with the duplex spur gear 142 of this spur gear 141 engagements, one slidably and rotationally is set in behind the motor shaft on the output 102, spur gear 143 with duplicate gear 142 engagements, one slidably and turning set be loaded on behind the motor shaft on the output 102, the actuating cam 144 that is connected with spur gear 143 and one and actuating cam make clearance meshing, be set in behind the motor shaft on the output 102 slidably and be fixed in the inverted cam 145 of above-mentioned surge drum bellows 12 bottom surfaces.Wherein actuating cam 144 comprises that one has the circle of the center hole of output 102 behind the rotatable suit motor shaft dull and stereotyped 1442, and two respectively have the right-angled trapezium cross section, is oppositely arranged the projection 1441 that is fixed on the plectane 1442 along plate 1442 diameter branch both sides.Inverted cam 145 is elongated, it comprises that one has the center hole of output 102 long by dull and stereotyped 1452 behind the suit motor shaft slidably, and two respectively have the right-angled trapezium cross section, be oppositely arranged the projection 1451 that is fixed on the plate 1452 along plate 1452 length direction branch both sides, the orientation of these two projections, should be this inclined-plane of the hypotenuse of right-angled trapezium cross section, can with relative engagement the in inclined-plane of projection 1441 on the actuating cam 144, like this, when actuating cam 144 rotates, just can pass through two pairs of projections 1441,1451 clearance meshing, force surge drum bellows 12 to be compressed, and the cleaning fluid in the recipient 13 is sent from the outlet end of tube.In addition, this hydrojet pressue device 14 comprises that also one can be articulated on the wheel hub of gear 143 around an intermediate supports spot wobble, an end, and the other end is as the clutch handle 146 that stretches out outside the casing 1, can selectively gear 143 be added or throw off engagement with it, to reach the purpose of hydrojet or interruption hydrojet; And,

One handle 30, being used for supporting above-mentioned mechanical part operates, it comprises a connecting rod 18 and one handle holding rod 15, wherein 18 1 on connecting rod is movably connected with casing 1 bottom centre by a universal joint 17, the other end links to each other with handle holding rod 15 by the articulated head 19 that can tighten or unclamp, like this, can be beneficial to the outside of wiping glass and be in arbitrary orientation, comprise the glass that is in the eminence horizontal direction such as indoor glass ceiling etc.In addition, handle holding rod 15 is provided with a switch that opens/close motor 10, and from then on the power supply wiring of motor and plug 21 stretch out in the bar.

See Fig. 5 (a), 5 (b) now.This be used for second embodiment, removably be loaded on and polish soft cloth plate 35 ' on the brush dish 7 of an embodiment.The difference of used cleaning brush plate 35 only is among this plate and the last embodiment: the bristle 5 on sheet member 3 changes soft cloth 5 ' into, in order to polish as smooth flat such as floor, this device surface and ceramic tile faces, wherein the cloth of part is long in the outer part, is beneficial to erasure in four jiaos part.

After understand above-mentioned structure of the present utility model by the explanation of two embodiment and form, just be understood that its operation and advantage thereof.

During operation, the operator at first injects surge drum 13 by filling opening 16 with cleaning fluid makes tube fill with cleaning fluid substantially and drain the bubble foam as far as possible.Then, connect power supply with plug 21.

As make washing and cleaning operation, and then rotate cleaning fluid spouting liquid adjustable plate 11, the corresponding small sircle hole that the long lumbar hole 111 on it is aimed on the surge drum 13 outlet end ends, and make the liquid road unimpeded.Open switch 20, motor 10 rotates.Regulate articulated joint 19 by the orientation of living in of waiting to clean the windows again and tighten.The operator hands handle holding rod 15, can will ask scouring of wool brush board 35 to touch the glass face.Because of the effect of universal joint 17 is arranged, so bristle 5 can touch the glass face substantially reposefully.When cleaning back and forth, machine is affixed to glass and make the preceding prominent strong point of brush dish case 9 be supported in the glass face, to alleviate the burden of motor 10.In case clutch handle 146 is closed, motor driven gear-cam pressing mechanism 14 then, wherein actuating cam 144 constantly rotates, with cause on it projection 1441 with gap with inverted cam 145 on projection 1451 engagement, and intermittently promote inverted cam 145, thereby the rear side bellows 12 that makes surge drum 13 is also done intermittent along its axial compressed action, forces in the tube cleaning fluid long and short tubule 132,131 in footpath off and on, and all through hole ejections are mapped to and wait on the face of cleaning the windows from the brush dish 7.Obviously; wherein long tubule 132 is mainly and is used for wiping and is in the horizontal glass of eminence and establishes; this is because when machine vertically upward the time; liquid level in the tube 13 descends because of constantly consuming to understand constantly; cleaning fluid is difficult to an amount of ejection when liquid level is lower than long tubule 132 ports; at this moment, then need shut down the interpolation cleaning fluid.

As when polishing floor and the operation of ceramic tile face, then close liquid measure adjustable plate 11, and throw off clutch handle 146, unload again and clean spiral brush board 35, change and polish soft cloth plate 35 ' and get final product; As make the woodenware glazing, and then in surge drum, use the liquid glazing agent instead, other method of operating is all the same.

In sum, be not difficult to find out: facility are cleaned/polish on this bright plane of the present utility model automatically spray feed cleaning fluid, substantially effectively carry out glass surface and ceramic tile face etc. four corners position cleaning and polish and save the advantages such as motor power consumption, have more the unique function that its each orientation windowpane all can be cleaned, be worth of widely use.

Claims (10)

1. a smooth flat is cleaned the machine of polishing, it comprise one its have before and after the micromachine 10 of output, the brush dish cover 9 that the one brush dish assembly 73 that is driven by output before the motor shaft 101 reaches in its periphery, one casing 1 at inside installation motor 10, one cleaning fluid surge drum 13, one hydrojet pressue device 14 and one is carried the handle 30 of this machine operation, it is characterized in that, described brush dish assembly 73 comprises that a brush dish 7 and is loaded on the described brush dish 7 removably, the brush board 35 of cleaning piece 5 is housed, and described brush dish 7 has an inner fovea part and is opened in the small through hole of all symmetrical distributions on the inner fovea part diapire; Described brush dish cover 9 is one to be slightly larger than and to cut foursquare square case outside the described brush dish 7, at least two position consistency and symmetrical distribution are arranged on its edge, every square limit near a side of opening wide of described cleaning piece 5, the strong point according to outstanding position, these strong points are positioned at same level, and be starkly lower than the end of described cleaning piece 5: described surge drum 13 is an annular cylinder shape structure, be loaded in the described casing 1 between described casing 1 and motor 10, the one end constitutes one scalable 12, scalable under the external force effect axial along it, its other end near described brush dish 7 is an outlet end; Being loaded in the described hydrojet pressue device 14 between the pars contractilis 12 of described surge drum 13 and casing 1 bottom is a gear-cam mechanism 14 that is driven by output 102 behind 10 in the described motor; Described cleaning is polished machine and is also comprised a cleaning fluid spouting liquid adjustable plate 11, and it is close to the outlet end inwall of described surge drum 13.

2. smooth flat as claimed in claim 1 is cleaned, polish machine, it is characterized in that, the preceding prominent strong point on the edge, every limit of described brush dish cover 9 is two, lay respectively at the position of the respective corners of close described brush dish cover 9, and the edge between this two strong point is a recessed inwards circular arc line, and looks from the direction over against each angle, and each angle is cut out a shape and fritter of the same size.

3. smooth flat as claimed in claim 1 is cleaned the machine of polishing, it is characterized in that, described surge drum 13 is combined by an annular canister part 8 and a telescopic annular cylinder shape bellows part 12, on the described annular canister part 8 walls outside, establish a filling opening 16, on the outlet end end wall of the close described brush dish 7 of described annular canister part 8, along having some equally distributed round tube holes on the excircle on it, and along also having some equally distributed round tube holes on the inner periphery on it.

4. smooth flat as claimed in claim 3 is cleaned the machine of polishing, it is characterized in that, all through holes on the inside and outside circumference on the described annular canister part 8 outlet end end walls are fixed with long tubule 132 and short tubule 131 respectively, the inner of wherein all long tubules 132 is inserted into suitable distance in the described surge drum 13, and the exposed junction of described long and short tubule 132,131 stretches in the inner fovea part of described brush dish 7.

5. clean the machine of polishing as claim 1 or 3 described smooth flat, it is characterized in that, described liquid measure adjustable plate 11 is the circular sheet 11 that an external diameter is slightly less than the annular canister part 8 outlet end internal diameters of described surge drum, offer on it quantity and position respectively with the identical and corresponding long waist shaped through hole of all round tube holes of described annular canister part 8 outlet end end wall upper edge excircles, along described plate 11 wrench that stretches out described surge drum 13 is arranged radially, can be by it with described adjustable plate 11 around its center rotation.

6. smooth flat as claimed in claim 1 is cleaned and is polished machine, it is characterized in that, described gear-cam mechanism 14 comprises a spur gear 141 that is driven by output behind the described motor shaft 102 and one and the duplex spur gear 142 of its engagement; One with the another spur gear 143 of described duplex spur gear 142 engagements, this spur gear slidably and rotationally is set in behind the described motor shaft on the output 102: an actuating cam 144 that slidably and rotationally is set on the described motor shaft rear output 102 and is connected with described spur gear 143; And, one be set in slidably on the described motor shaft rear output 102, intermittently mesh and be fixed in the inverted cam 145 of bellows part 12 bottom surfaces of described surge drum with described actuating cam 144, and one can be articulated on gear 143 wheel hubs around an intermediate supports spot wobble, an end, and the other end is as stretching out the outer clutch handle 146 of casing 1.

7. smooth flat as claimed in claim 6 is cleaned the machine of polishing, it is characterized in that, described actuating cam 144 comprise one have one slidably and rotationally behind the described motor shaft of suit the circle of the center hole of output 102 dull and stereotyped 1442, and two respectively have the right-angled trapezium cross section, be oppositely arranged the projection 1441 that is fixed on the described plate 1442 along described plate 1442 diameter branch both sides; Described inverted cam 145 comprises that one has center hole long dull and stereotyped by 1452 of the described motor shaft of suit rear output 102 slidably, and two respectively have the right-angled trapezium cross section, be oppositely arranged the projection 1451 that is fixed on the described plate 1452 along described plate 1452 length direction branch both sides, the orientation of this two projection 1451, should be the right-angled trapezium cross section hypotenuse this inclined-plane can with relative engagement the in inclined-plane of described projection 1441 on the described actuating cam 144.

8. smooth flat as claimed in claim 1 is cleaned the machine of polishing, it is characterized in that, described handle 30 comprises a connecting rod 18 and one handle holding rod 15, one of wherein said connecting rod 18 by the bottom centre flexible connection of a universal joint 17 with described casing 1, the other end links to each other with described handle holding rod 15 by the articulated head 19 that can tighten or unclamp, establishes the power switch 20 of a motor 10 on described handle holding rod 15.

9. smooth flat as claimed in claim 1 is cleaned the machine of polishing, it is characterized in that, brush board 35 in the described brush dish assembly 73 is a cleaning brush plate, it mainly comprises a circular sheet spare 3, its hollow out four 90 ° of uniform covering of the fan districts, on the spoke that each bar that stays radially extends, respectively be covered with and cleaned with bristle 5, the wherein outer a part of bristle that encloses 5 outward-dipping stretching out, and its length obviously is longer than the length of the bristle 5 at other position.

10. smooth flat as claimed in claim 1 is cleaned the machine of polishing, it is characterized in that, brush board 35 in the described brush dish assembly 73 is to polish the soft cloth plate, it mainly comprises a circular sheet spare 3, its hollow out four 90 ° of uniform covering of the fan districts, on the spoke that each bar that stays radially extends, respectively be covered with and polished with soft cloth 5 ', the wherein outer a part of soft cloth that encloses 5 ' outward-dipping stretching out, and its length obviously is longer than the length of the soft cloth 5 ' at other position.

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