CN1177914A - Vacuum cleaner and suction piece assembly thereof - Google Patents

Abstract

The suction nozzle and the vacuum cleaner using the suction nozzle, wherein the suction nozzle arranged in the suction nozzle assembly has a rotating impeller driven by suction force. The brush or scraper is spirally installed on the whole impeller or part of the impeller, and is in contact with the surface to be cleaned, and the rotating brush coaxial with the impeller will rotate together. No partition such as a partition wall is provided between the impeller and the rotating brush. The suction nozzle is small in size, light in weight and low in noise.

Description

Vacuum cleaner and suction piece assembly thereof

Technical field

The invention relates to a suction piece assembly of a vacuum cleaner and vacuum cleaner, particularly (especially this is brushed and is a kind of rod-like element about comprising a rotating brush, wherein the scopiform part and scrape plate and be wound in helical form) vacuum cleaner and a suction piece assembly of vacuum cleaner, wherein inhalation power can be used as the driving power source.

Technical background

In traditional vacuum cleaners, particularly comprise in the suction piece assembly of rotating brush one, inhalation power is that the rotation of impeller passes to rotating brush by a belt pulley spare or a belt piece as the power source that drives.Press said structure, be arranged because impeller and rotating brush divide, the overall structure of suction piece assembly will be not only greatly but also heavy.

Therefore, as at No.Sho 63-214, in No. 217 Japanese Patent Laid-Open Publications and described in the No.Sho 64-58223 Japanese Patent Laid-Open Publication, advise installing a rotating brush, this rotating brush is the one rotation with the coaxial installation of impeller and with impeller; And the suction piece assembly in suggestion employing formation one vortex chamber, can be closed above-mentioned impeller by utilizing partition wall vortex chamber.

Moreover, have with mentioned kind equipment file associated: No.Sho 54-177, No. 170 practical public publications of Japan and No.Sho 57-69, No. 665 practical public publications of Japan etc.

In above-mentioned routine techniques, be that because the impeller volume is big, so can bring following problems: the size of suction piece assembly unavoidably also will increase in those equipment that impeller drove of installing on by another at the rotating brush of suction piece assembly.In addition, because the rotating speed of impeller is approximately 3-4 times of the rotating brush rotating speed, this will cause the big problem of noise.

Moreover, in the equipment of impeller and the coaxial setting of rotating brush, from the outside inhaled air of suction piece assembly through one to be cleaned.Air is taken away by scopiform part on the rotating brush or is scraped the dust that plate has been swept, and air is through suction piece assembly subsequently.Air flows to by bump taking place and produce torque thus with impeller in the vortex chamber of partition wall sealing.

When suction piece assembly was raised, with unusual high speed rotation, noise also produced thereupon owing to the resistance force diminishes of rotating brush.Moreover owing to do not fill out when putting in finger in the suction piece assembly, danger also takes place thereupon as the operator.

Moreover, because the dust on the floor will pass through ozzle portion, the sectional area of ozzle portion gas outlet end just can not be too little, thereby also just can not increase the flow velocity of the air stream that clashes into mutually with impeller, and the result will occur being difficult to produce enough big torque makes rotating brush rotate this problem.

To narration of the present invention

One object of the present invention is to provide a suction piece assembly that size is little, in light weight and noise is little that uses and the dust catcher that uses this suction piece assembly in vacuum cleaner (deduster).

Above-mentioned purpose realizes by following: be equipped with in a suction piece assembly inside impeller that produces rotation according to inhalation power be connected with whole impeller or part impeller and scrape plate with a surperficial contacted scopiform part or to be cleaned, (scopiform part or scrape plate and can be described as flexible material and scrape plate except that These characteristics, such as a rubber scraper, it presents soft performance with the material compared that constitutes above-mentioned impeller).

Perhaps, above-mentioned purpose can by provide one with the rotating brush of the coaxial installation of impeller and one rotation, but between impeller and rotating brush, the class A of geometric unitA of partition wall is not set and realizes; Above-mentioned purpose also can realize by following: make clash into mutually from the outside whole fluids that suck of suction piece assembly or segment fluid flow and impeller force that impeller rotates, fluid flows through to be cleaned and be sucked in the body of vacuum cleaner thereupon.

In other words, include according to vacuum cleaner of the present invention: one in order to produce the electric power blowing motor of inhalation power, and one accommodates the housing of electric power blowing motor; In housing, form and be positioned at a dust collection unit of electric power blowing motor one suction side; One flexible pipe that links to each other with the peristome of housing and/or prolongation pipe, this peristome is opened towards the dust collection unit; One is positioned at flexible pipe and/or prolongs the middle part of pipe or be positioned at flexible pipe and prolong the pipe contiguous place, position that is connected and be used for driving the dry switch actuation unit of machine operation of electric power; With a suction piece assembly that links to each other with a top of flexible pipe and/or prolongation pipe, wherein, can implement the cleaning scale removal to cleaning face to be cleaned (hereinafter to be referred as face to be cleaned) by the inhalation power that utilizes electric power blowing motor, desirable form is listed below:

(1) one impeller is arranged in the suction piece assembly and by the inhalation power effect and rotates; One scopiform part and/or one is scraped plate and is linked to each other with whole impeller or part impeller and contact with face to be cleaned; Whole impeller or part impeller are as a rotation scopiform part and/or a rotor segment spare.

(2) in aforesaid clause (1), scopiform part and/or scrape plate with single scopiform part or a plurality of scopiform part, the single combination of scraping plate or a plurality of scopiform part or a plurality of scopiform part and scraping plate, shape links to each other with impeller in the shape of a spiral.

(3) in aforesaid clause (1) or (2), the length of impeller is greater than half of suction piece assembly inside longitudinal length.

(4) at aforesaid clause (1) to (3) in each, scopiform part and/or scrape plate and extend towards outer circumferential side from a blade of impeller.

(5) at aforesaid clause (1) to (4) in each, a housing is arranged on an outside of impeller, and this housing is uncovered towards floor one side.

(6) in each, be provided with the air inlet that from outside suck air at the contiguous place at suction piece assembly two ends at aforesaid clause (1) to (5), described air inlet separate independent setting with one towards an open surface of to be cleaned; Top ends at flexible pipe that is connected with the central part of suction piece assembly and/or prolongation pipe is formed with a gas outlet; Be symmetrically distributed with extension axis in the contiguous relative gas outlet of locating of air inlet, above-mentioned two ends.

(7) in aforesaid clause (6), the diameter of impeller is big and less at central part at the place, two ends.

(8) at aforesaid clause (1) to (5) in each, be provided with an air inlet from outside suction air at the suction piece assembly central part, described air inlet and one separates separately towards an open surface of to be cleaned and to be provided with, two ends in the admittance district of an impeller of suction piece assembly inside are formed with a gas channel, and are formed with a gas outlet at flexible pipe that is connected with the central part of suction piece assembly and/or the top ends that prolongs pipe.

(9) at aforesaid clause (1) to (8) in each, greater than 50gr.cm (gram-centimeter) but set less than 200gr.cm, preferably torque is greater than 80gr.cm but less than 100gr.cm by its torque on a carpet for impeller diameter.

(10) one impellers are arranged on the inside of suction piece assembly and force its rotation by inhalation power; One rotating brush is with the coaxial setting of impeller and be integral rotation; And a partition wall or analog (in other words, form an axial flow passage and and but the bar of partition wall and so on) be not set between impeller and rotating brush.

(11) in aforesaid clause (10), one of rotating brush with floor against below open wide, but a part of surface that has impeller to exist is not open.

(12) in aforesaid clause (10) or (11), comprise that a scopiform part or scrapes one the diameter of rotating brush of plate greater than the diameter of impeller.

(13), do not comprise that a scopiform part or scrapes one the diameter of rotating brush of plate less than the diameter of impeller at aforesaid clause (10) to (12) in each.

(14) at clause (10) to (13) in each, of scraping plate and rotating brush links to each other.

It is as described below that (15) one air flow the formation of regular passage: by at first clashing into impeller from the outside all or part of fluid that sucks of suction piece assembly, fluid passes through to be cleaned and be sucked in the body of vacuum cleaner subsequently.

(16) in aforesaid clause (15), be provided with tomorrow the impeller direction of rotation blow out the single or multiple nozzles of above-mentioned fluid.

(17) in aforesaid clause (15) or (16), not to locate in a straight line in an air inlet and a gas outlet of suction piece assembly inside.

(18) at aforesaid clause (10) to (17) in each, the switch actuation unit comprises a switches set that is used for handling power supply and inhalation power break-make, also comprises to be used for making control signal to transfer to the device of vacuum cleaner body from the switch actuation unit with wireless transmission method.

(19) at aforesaid clause (1) to (18) in each, the rotating speed of impeller is greater than 1000r/min but less than 10,000r/min (rev/min).

(20) at aforesaid clause (1) to (19) in each, being used for from the area of an air inlet of the outside suck air of suction piece assembly is that static pressure by the suction piece assembly inside on carpet remains on greater than-3,000Pa but less than setting in-200Pa the scope.

(21) at aforesaid clause (1) to (21) in each, the wheel blade of impeller wheel blade group is distorted-structure.

(22), be provided with wheel and utilize it to sink degree difference in into to be cleaned at the end, the sidepiece of housing, and impeller is had in response to such as being the floor a carpet and the floor and change the function that speed is changeed at least at clause (1) to (21) in each.

(23) at aforesaid clause (1) to (22) in each, the rotating speed on carpet is greater than 1,000r/min but less than 10, and 000r/min, preferably rotating speed is greater than 3,000r/min but less than 4,000r/min; At the rotating speed on the floor less than the rotating speed on carpet.

(24) in aforesaid clause (23), rotating speed when the rotating speed on carpet is mentioned greater than suction piece assembly, or at the rotating speed on the carpet greater than the rotating speed on the floor, rotating speed when mentioning greater than suction piece assembly with the rotating speed on the floor, the torque of impeller when the torque of impeller is mentioned greater than suction piece assembly on carpet.

(25), be provided with one and be raised the mechanism that the rotating speed that makes impeller under the situation automatically reduces or stops at suction piece assembly at aforesaid clause (1) to (24) in each.

(26) in each, be provided with the closing function enhanced device that is used to make the floor peristome at aforesaid clause (1) to (25).

In pressing suction piece assembly of the present invention, can implement to clean scale removal to be cleaned by using the inhalation power that produces according to electric power blowing motor, and be installed in inside according to the impeller that inhalation power rotates, its mode of operation is as follows:

(A) a scopiform part and/or is scraped plate and is connected on the part of whole impeller or impeller so that contact with to be cleaned, with on the part of whole impeller or impeller so as to contact with to be cleaned and the part of whole impeller or impeller as a rotation scopiform part and/or a rotor segment spare.

(B) in aforesaid clause (A), scopiform part and/or to scrape plate be with single scopiform part or a plurality of scopiform part; Single plate or a plurality of plate of scraping scraped; Or a plurality of scopiform parts and the various combinations of scraping plate and in the shape of a spiral shape be connected with impeller.

(C) at aforesaid clause (A) or (B), the length of impeller is greater than half of suction piece assembly inside lengthwise.

(D) at aforesaid clause (A) to (C) in each, scopiform part and/or scrape plate and extend towards outer circumferential side from the blade of impeller.

(E) at aforesaid clause (A) to (D) in each, the outside and described housing that a housing is arranged on impeller open wide towards a floor side.

(F) in each, be provided with the air inlet that from outside suck air at the contiguous place at suction piece assembly two ends at aforesaid clause (A) to (E), described air inlet separate independent setting with one day to an above-mentioned to be cleaned open surface; Top ends at flexible pipe that is connected with the central part of suction piece assembly and/or prolongation pipe is formed with a gas outlet; Be symmetrically distributed with extension axis in the contiguous relative gas outlet of locating of air inlet, above-mentioned two ends.

(G) in aforesaid clause (F), the diameter of impeller is big then less at central part at the place, two ends.

(H) at aforesaid clause (A) to (E) in each, central part at the air intake duct assembly is provided with an air inlet from outside suction air, described air inlet and one separates separately towards an open surface of to be cleaned and to be provided with, admit the two ends in district to be formed with a gas channel at one of the above-mentioned impeller of above-mentioned suction piece assembly inside, be formed with a gas outlet with a top ends of flexible pipe that is connected at central part and/or prolongation pipe with the air intake duct assembly.

(I) at aforesaid clause (A) to (H) in each, the torque that the diameter of impeller has according to impeller on carpet is greater than 50gr.cm but set less than 200gr.cm, and particularly torque value preferably is set in greater than 80gr.cm but less than in the 100gr.cm scope.

(J) rotating brush and coaxial setting of impeller and one rotation, and partition wall or analog are not set between impeller and rotating brush.

(K) in aforesaid clause (J), a lower surface of rotating brush opens wide and leans with floor, but the part that has an impeller is not opened wide.

(L), comprise that a scopiform part or scrapes the diameter of rotating brush of plate greater than the diameter of impeller at aforesaid clause (J) or (K).

(M), do not comprise that a scopiform part or scrapes the diameter of rotating brush of plate less than the diameter of impeller at aforesaid clause (J) to (L) in each.

(N) at aforesaid clause (J) to (M) in each, of scraping plate and rotating brush links to each other.

(O) air flows the formation of regular passage such as following: at first be by clashing into from outside all or part of fluid and the impeller that sucks of suction piece assembly, fluid passes through to be cleaned and be sucked in the body of vacuum cleaner subsequently.

(P) in aforesaid clause (O), be provided with tomorrow the impeller direction of rotation blow out the single or multiple ozzles of above-mentioned fluid.

(Q), not to locate in a straight line in an air inlet and a gas outlet of suction piece assembly inside at aforesaid clause (O) or (P).

(R) at aforesaid clause (A) to (Q) in each, the rotating speed of impeller is greater than 1,000r/min but less than 10,000r/min.

(S) at aforesaid clause (A) to (R) in each, being used for from the area of an air entry of the outside suck air of suction piece assembly is that static pressure by the suction piece assembly inside on carpet remains on greater than-3,000Pa but less than setting in-200Pa the scope.

(T) at aforesaid clause (A) to (S) in each, the wheel blade of impeller wheel blade group is distorted-structure.

(U) at aforesaid clause (A) to (T) in each, be provided with wheel and utilize it to sink the difference of an interior degree into to be cleaned at the end, the sidepiece of housing, and impeller is had in response to such as being the floor a carpet and the floor and change the function of rotating speed at least.

(V) at aforesaid clause (A) to (U) in each, the rotating speed on carpet is greater than 1,000r/min but less than 10,000r/min; Less than the rotating speed on carpet, the rotating speed on carpet is more preferably greater than 3 at the rotating speed on the floor, 000r/min but less than 4,000r/min.In the case, the rotating speed the when rotating speed on carpet is mentioned greater than suction piece assembly, and be preferably in rotating speed on the carpet greater than the rotating speed when the rotating speed on the floor and the rotating speed on the floor are mentioned greater than suction piece assembly.

(W), be provided with one and be raised the mechanism that the rotating speed that makes impeller under the situation automatically reduces or stops at suction piece assembly at aforesaid clause (A) to (V) in each.

(X) in each, be provided with the closing function enhanced device that makes the floor opening at aforesaid clause (A) to (V).

By in the explanation of the present invention, the carpet device is so-called standard type carpet.That class carpet described in No. 312 publications of international electrical engineering standard meeting (IEC) (second edition 1981) " vacuum cleaner technical committee " (August 31, Showa58 (1983)) that the standard type carpet is just published in the Japanese power industry association by as the cooperation legal person described in the 51st page of the ancillary documents A.

In other words, press IEC-SC59F (Secretariat) 26, " a kind of method of measuring vacuum cleaner " annex A, chapters and sections A, 1.1.2 meets following condition and weight by the carpet that is adopted in the embodiments of the invention.In other words, this kind Hui Erdun (wilton) carpet is a kind of all woolen type wilton carpet, the high 6-7mm of plot blanket, and weight is 1.40-1.55kg/m ², it is that a kind of carpet and wire harness number of tool V-shaped line bundle is 140,000-175,000/m ², this carpet that is used for testing also has regulation (a kind of fiber carpet) at the JIS-L-4404 of Japanese Industrial Standards (JIS).

Moreover " floor " means it is timber floor, in any case but will mention " matting " especially also can be used.The floor of touching upon can be consulted the standard floor described in the appendix A of mentioning in the above.

Moreover in pressing explanation of the present invention, " impeller " directly produces torque (revolving force), the most handy metal material of impeller (lead) or being made of one of plastic resin injected plastics material structure by means of clashing into mutually with the air-flow with directionality.

In other words, the ratio of rigidity scopiform part of wheel blade portion (scopiform part and the common name of scraping plate) is big, and in addition as a kind of basic conception, the scopiform part comprises spongiform material, and flight portion is scraped plate or by scraping constituting of plate and scopiform part by simple.The above-mentioned flight portion of ratio of rigidity of scraping plate is low.

Then, will narrate hereinafter according to function of the present invention.Thereby just may produce enough big power impeller is rotated owing at first clash into impeller from the outside whole fluids that suck of suction piece assembly or segment fluid flow.

Moreover, owing between impeller and rotating brush, do not have partition wall, under the situation that suction piece assembly is raised, air almost sucks and sucks from ozzle hardly from the peristome of floor entirely, therefore impeller rotates hardly, correspondingly if the operator puts in finger in the suction piece assembly still secure safely accidentally.

The length of preferably setting impeller is one more medium-sized than the inner longitudinal length of suction piece assembly.In routine techniques, impeller and scopiform part constitute on same axle, are distinct yet scraper plate exists position and impeller to have the position, exist the position can not sweep dust at scraper plate.

Therefore, there is the position in necessary shortening scraper plate and scope that propagation energy is cleaned.Because impeller and scopiform part constitute one, impeller can be done longly relatively like this yet in the present invention.

The speed setting of impeller is greater than 1,000r/min but, be more satisfactory in the scope of 000r/min less than 10, and reason is if the rotating speed of impeller greater than 1, just can not be cleared away dust during 000r/min effectively.

Generally speaking, the rotating speed height of impeller, the ability of control of dust is just big, however if rotating speed surpasses 10, during 000r/min the ability of control of dust saturated and follow the impeller rotation and the noise that produces becomes quite big.

Moreover, remain on greater than-3 000Pa but be more satisfactory in the scope less than-200Pa being used for setting the static pressure that on carpet, can make carpet inside for from the outside area that sucks the air inlet cross section of air of suction piece assembly.The cross-sectional area of air inlet is according to the static pressure in the suction piece assembly and definite, but under the situation of the absolute value in static pressure low (negative pressure is little) and not reaching-200Pa, air velocity through air inlet bump impeller is just very low, thereby just can not produce the torque of expection.

Yet, at the absolute value height (negative pressure is big) of static pressure and above-3, under the situation of 000Pa, suction piece assembly will be by " the sticking suction " on carpet, so just be difficult to the suction piece assembly implementation and operation, the air that spills from floor becomes quite big in addition, and correspondingly torque is saturated.

Can obtain preferably to set forr a short time as far as possible under the essential torque condition to the diameter of impeller.Therefore, the torque that produces on carpet is more satisfactory greater than 50gr.cm (more preferably greater than 80gr.cm) but less than 200gr.cm (preferably less than 100gr.cm).In above-mentioned scope, can determine the diameter of rotor effectively.

Relative carpet, the optimum speed that cleans to be cleaned should be greater than 1, and 000r/min is (more preferably greater than 3,000r/min) but less than 10,000r/min is (preferably less than 4,000r/min).Because the scopiform part does not contact with matting with the floor basically, so just there are not the notion of optimum speed in timber floor and matting, but consider noise problem relatively, make the noise of generation littler (being lower than 50dB).

More satisfactory rotating speed should meet following relational expression: the rotating speed of the rotating speed on carpet＞when mentioning.It yet but is to meet such relational expression in prior art: the rotating speed of the rotating speed on carpet＜when mentioning.More satisfactory torque should meet following relational expression: the torque of the torque on carpet＞when mentioning; Yet in prior art but be on carpet and when mentioning under these two kinds of conditions torque constant.

Moreover, according to the present invention, at first clashing into impeller from the outside all or part of fluid that sucks of suction piece assembly and make the impeller rotation, the air that forms subsequently stream is sucked in the body of vacuum cleaner through face to be cleaned.

Yet in prior art, from the outside inhaled air stream of suction piece assembly is at first flowed through surface to be cleaned and air, contain the dust swept and when passing through suction piece assembly and impeller clash into.Impeller pneumatically is forced to rotation, and air is sucked in the body of vacuum cleaner afterwards.

According to the present invention, because the scopiform part is and the coaxial setting of impeller, thus be used for that the size of suction piece assembly of vacuum cleaner is little, in light weight, noise is little, and the vacuum cleaner that uses this suction piece assembly can be provided.

Moreover, when mentioning suction piece assembly, because the rotational automatic deceleration of impeller or stop,, and the operator was waited finger when stretching into suction piece assembly accidentally so can not produce because the noise that high rotating speed causes, safe still secure.

Moreover because high-speed air flow also contact with floor, and dust quilt on the floor is just peeled off can carry out very smoothly, and the dust that peels off is easy to be transported to the gas outlet, the dust concentration can improve like this in scopiform part and floor contact site.

Moreover, providing being sent to from the switch actuation unit under the situation of device of vacuum cleaner body not adopt the holding wire transmission means with the signal of infrared light, ultrasonic wave or radio wave form, the inside of flexible pipe and prolongation pipe just there is no need to install heart yearn, therefore the construction weight that prolongs pipe and flexible pipe just can reduce, and has also further improved maneuvering performance.

Moreover owing to need not be electrically connected at flexible pipe and junction, two ends thereof, structure just can be simplified.And, in flexible pipe, do not adorn the electric wire of using civil power, even when this worst case of hose fracture takes place, operator's safety is still secure.

Description of drawings:

Fig. 1 illustrates the perspective view by a suction piece assembly of first embodiment of the invention;

Fig. 2 is the appearing diagram by a vacuum cleaner of the present invention;

Fig. 3 is the top surface perspective by a suction piece assembly of first embodiment of the invention;

Fig. 4 is the drawing in side sectional elevation by a suction piece assembly of first embodiment of the invention;

Fig. 5 is another drawing in side sectional elevation by a suction piece assembly of first embodiment of the invention;

Fig. 6 is the another drawing in side sectional elevation by a suction piece assembly of first embodiment of the invention;

Fig. 7 is the another drawing in side sectional elevation by a suction piece assembly of first embodiment of the invention;

Fig. 8 illustrate by a suction piece assembly of second embodiment of the invention one on perspective view;

Fig. 9 is a drawing in side sectional elevation of one second kind of suction piece assembly of second embodiment of the invention;

Figure 10 is a drawing in side sectional elevation of one second kind of suction piece assembly of third embodiment of the invention;

Figure 11 illustrates the top surface perspective by the suction piece assembly of fourth embodiment of the invention;

Figure 12 is the top surface perspective by the suction piece assembly of second embodiment of the invention;

Figure 13 is the another top surface perspective by the suction piece assembly of second embodiment of the invention;

Implement optimised form of the present invention (embodiment 1)

Will be below in conjunction with consulting accompanying drawing to describing in detail according to the first embodiment of the present invention.

Fig. 1 shows a perspective view of a suction piece assembly.Label 101 is meant the body of suction piece assembly, and 102 refer to a floor, and 103 are meant an impeller, and 104 refer to refer in order to from the outside air inlet that sucks air of suction piece assembly with a scopiform part and the 105-106 on the rotor outer peripheral face of shape in the shape of a spiral.

Fig. 2 illustrates the vacuum cleaner appearing diagram by present embodiment.201 refer to a body of vacuum cleaner, and 203 refer to be arranged on a switch actuation unit of a flexible pipe Handheld Division, and 204 refer to that one prolongs the body that pipe and 101 refers to suction piece assembly.

Shown in Figure 3 is a top surface perspective of suction piece assembly body 101, and in Fig. 3,301 refer to that a gas outlet of suction piece assembly and 302-303 are meant whirlpool air stream.

Fig. 4 illustrates the profile along A-A ' line of suction piece assembly body 101.401 is carpets, and 402 refer to peristome of (court) floor and the direction that arrow 403,405 is meant air stream.

Fig. 5 illustrates the profile along B-B ' line of suction piece assembly body 101.501 are meant the coupling part (or connecting portion) of suction piece assembly, and 502 are meant a gas outlet, and arrow 503 refers to that airflow direction and arrow 504 refer to that the coupling part 501 of suction piece assemblies can be done at this place upwards, downward motion.

Fig. 6 illustrates the profile along C-C ' line of suction piece assembly body 101.601 are meant that side of suction piece assembly and 606-603 refer to the wheel that is used for towing on the floor.

Hereinafter will the work by first embodiment of the invention be described.

When the operator of vacuum cleaner handles switch actuation unit 203 on the flexible pipe Handheld Division, according to the mode of operation of institute's master cock, the electric power blowing motor rotation in the vacuum cleaner body 201.The inhalation power that electric power blowing motor produces is through flexible pipe 202 and prolong the body 101 that pipe 204 arrives at suction piece assembly.

Because floor peristome 402 is sealed by carpet 401 as shown in Figure 4, air clashes into 105 suctions and with impeller 103 mutually from air inlet 106 in suction piece assembly body 101, forces impeller 103 rotations so produce torque.A wall 404 of air impact air intake duct assembly inside subsequently is so the flow velocity of air changes angular velocity of rotation into, so air rotates with high rotation speed along arrow 405 directions.

Simultaneously, as shown in Figure 3,,, produced the air stream 302 and 303 of vortex immediately, in these air-flows, be formed with a central axis that is parallel to floor 401 substantially so produced 304 and 305 speed vertically because air 301 is drawn from the gas outlet.Because being the outer peripheral faces around impeller 103, vortex air stream 302 and 303 flows, so just to the extra torque of impeller action one.

Dust on the carpet is swept and is taken away by vortex air stream 302 and 303 from floor peristome 402 by scopiform part 104.Air further is sucked into the body 201 of vacuum cleaner through gas outlet 502.

Moreover as shown in Figure 6, because wheel 602-603 sinks in the carpet, the gap that forms between floor peristome 402 and floor 401 disappears, then air almost all pass through air inlet 105,106 and be inhaled into, thereby impeller 103 rotates at a high speed.

Yet as shown in Figure 7, wheel 602-603 sinks in floor or the matting hardly, the gap appears between plate face peristome 402 and floor 401, so reduce through the indrawn air capacity of air inlet 105-106, the rotating speed of impeller 103 descends thereupon, and the rotating speed that is suitable for floor or matting like this is achieved automatically.

Moreover when mentioning suction piece assembly, because nearly all air-flow is to be inhaled into from floor peristome 402, impeller 103 rotate hardly, so when even the operator puts in finger in the suction piece assembly accidentally, safe still secure.

Moreover as shown in Figure 8, impeller 801 is to be contorted configuration, utilizes the energy that points to the air-flow axial component 804,805 of central part from both sides of vortex air-flow in the suction piece assembly just may improve the torque of impeller 801.Because axial flow 804,805th forms reverse flow, just need have the opposite distorted-structure of (relatively) direction.

Moreover, might be arranged on scopiform part 802,803 on the axle of impeller along the distortion of scraping plate.In addition, can rubber mass 902-903 and plate 904-905 be installed,, so also can improve the torque of impeller so under the degree of closure situation that has increased floor peristome 402, increase through air inlet 105-106 amount of air drawn at the position that contacts with floor.

Be provided with two (air inlet) mouth in this embodiment, air is inhaled into from the both sides of suction piece assembly.Yet, two (air inlet) positions always will be set, can make the open-front of suction piece assembly and make the front all as air inlet.Moreover (air inlet) mouth also can be arranged on the back of suction piece assembly, so just can make the direction of rotation of impeller opposite.

Moreover, as shown in figure 10, by two impellers being set and air inlet being set, formed two impellers like this by separately direction rotation at the front and rear of suction piece assembly, just might improve the ability of gathering dust.

Moreover, as shown in figure 11, one air inlet 111 can be arranged on the central part of suction piece assembly, and gas outlet 114,115 are arranged on two (sides) end of suction piece assembly, in the case, because the axial component of air-flow (or axial shunt volume) 114, the 115th, to flow in opposite direction, the distortion of impeller 116 also will be opposite configuration.

As mentioned above, impeller and the scopiform part by present embodiment is configured on the same axle, so the suction piece assembly size of vacuum cleaner is little, in light weight, noise is also little, so just can provide the vacuum cleaner that the present embodiment suction piece assembly is housed.

Moreover, mentioning under the situation of suction piece assembly, because the rotational automatic deceleration of impeller or stop, so just can not producing the noise that sends when rotating at a high speed owing to rotating brush, even when the operator put in finger etc. in the suction piece assembly accidentally, safety was still secure.

Moreover, contact the position because high-speed air flow also contacts with floor in scopiform part and floor, dust is peeled off from floor smoothly, the dust that peels off is transported to the gas outlet at an easy rate, thereby has improved the function of gathering dust.

Moreover, providing being sent to from the switch actuation unit under the situation of device of vacuum cleaner body not adopt the holding wire transmission means with the signal of infrared light, ultrasonic wave or radio wave form, inside at flexible pipe and prolongation pipe just there is no need to install heart yearn, therefore the construction weight that prolongs pipe and flexible pipe just can alleviate, and has also further improved maneuverability.

Moreover owing to need not be electrically connected at flexible pipe and junction, two ends thereof, structure just can be simplified, and does not install the electric wire of using civil power in flexible pipe, even when this worst case of hose fracture takes place, operator's safety is still secure.(embodiment 2)

Will be below in conjunction with accompanying drawing to describing in detail by the second embodiment of the present invention.

Figure 12 illustrates a top surface perspective of a suction piece assembly.Among Figure 12, label 121-122 is meant the major diameter impeller, and 123 refer to a minor diameter impeller, 124 refer to a scopiform part, 125-126 refers to be used for from the outside air inlet that sucks air of suction piece assembly, and 127 refer to that an air inlet of suction piece assembly and 128-129 refer to vortex air stream.

Then will explain work by the second embodiment of the present invention.

When the operator of a vacuum cleaner handles switch actuation unit 203 on the flexible pipe Handheld Division, mode of operation according to institute's master cock, vacuum cleaner body 201 interior electric power blowing motors are driven, and the inhalation power that electric power blowing motor produces arrives at suction piece assembly body 101 through flexible pipe 202 and prolongation pipe 204.

Because floor peristome 129 is closed by carpet, air just is inhaled into and clashes into impeller 121 and 122 and produce torque through air inlet 125 and 126, and air just forms vortex air stream 128 subsequently.Owing to vortex air stream rotates around the periphery of minor diameter impeller 123, impeller just obtains an additional torque.

Dust on the carpet has been swept by scopiform part 124 and has further been taken away by vortex air stream 128, and air is sucked in the vacuum cleaner body 201 through gas outlet 127.

Moreover when mentioning suction piece assembly, because air almost all is to suck from floor peristome 129, rotor 123 rotate hardly, even so the operator when stretching into finger in the suction piece assembly accidentally safety still secure.

Moreover as shown in figure 13, under the enough big situation of the torques of major diameter impeller 125 and 126 generations, central part 131 can be exempted installation scopiform part 132 as long as construct by one by this structure so.

As mentioned above, press present embodiment, impeller and scopiform part are to be configured on the same axle, so the suction piece assembly size of vacuum cleaner is little, in light weight and noise is little, so just can provide the vacuum cleaner that the present embodiment suction piece assembly is housed.

Moreover, press present embodiment, the central part of impeller can be done carefullyyer, and physical dimension can further reduce like this, and construction weight further alleviates.In addition, the floor peristome that is positioned at the lower portion of major diameter impeller bottom closes, so when the carpet of the longer sagging of tool portion put in suction piece assembly than the fluffy and disorderly carpet of knowing fluffing, carpet can't bump with impeller, so impeller can not stop the rotation.

Moreover, mentioning under the situation of suction piece assembly, because the rotational automatic deceleration of impeller or stop, so just can not producing the noise that sends when rotating at a high speed owing to rotating brush, even when the operator put in finger etc. in the suction piece assembly accidentally, safety was still secure.

Moreover, contact the position because high-speed air flow also contacts with floor in scopiform part and floor, dust is peeled off from floor smoothly, the dust that peels off is transported to the gas outlet at an easy rate, thereby has improved the function of gathering dust.

Moreover, the signal of infrared light, ultrasonic wave or radio wave form is transferred to from the switch actuation unit under the situation of device of vacuum cleaner body not adopt the holding wire transmission means providing, inside at flexible pipe and prolongation pipe just there is no need to install heart yearn, therefore the construction weight that prolongs pipe and flexible pipe just can alleviate, and has also further improved maneuverability.

Moreover owing to need not be electrically connected at flexible pipe and junction, two ends thereof, structure just can be simplified, and does not install the electric wire of using civil power in flexible pipe, even when this worst case of hose fracture takes place, operator's safety is still secure.

As mentioned above, press present embodiment, impeller and scopiform part are to be configured on the same axle, so the suction piece assembly size of vacuum cleaner is little, in light weight, noise is little, so just can provide the vacuum cleaner that the present embodiment suction piece assembly is housed.

Moreover, mentioning under the situation of suction piece assembly, because the rotational automatic deceleration of impeller or stop, so just can not producing because the noise of rotating brush generation when rotating at a high speed, even when the operator put in finger etc. in the suction piece assembly accidentally, safety was still secure.

Moreover, contact the position because high-speed air flow also contacts with floor in scopiform part and floor, dust is peeled off from floor smoothly, the dust that peels off is transported to the gas outlet at an easy rate, thereby has improved the function of gathering dust.

Moreover, providing being sent to from the switch actuation unit under the situation of device of vacuum cleaner body not adopt the holding wire transmission means with the signal of infrared light, ultrasonic wave or radio wave form, inside at flexible pipe and prolongation pipe just there is no need to install heart yearn, therefore the construction weight that prolongs pipe and flexible pipe just can alleviate, and has also further improved maneuvering performance.

Moreover owing to need not be electrically connected at flexible pipe and junction, two ends thereof, structure just can be simplified, and does not install the electric wire of using civil power in flexible pipe, even when this worst case of hose fracture takes place, operator's safety is still secure.

Claims (58)

1. A vacuum cleaner includes: an electric blower motor for generating suction force; a casing for accommodating the electric blower motor; formed in the casing and located on the suction side of the electric blower motor a dust collection part; a hose and/or extension tube connected to the opening of the housing, and the opening is opened towards the dust collection part; a hose and/or extension tube located at the A switch control unit used to drive the work of the electric blower motor at the middle part of the hose or adjacent to the connecting portion of the extension pipe; and a connection with the hose and/or the extension pipe The suction nozzle assembly connected to the top, wherein by utilizing the suction force of the electric blower motor, the cleaning surface to be cleaned can be hereinafter referred to as the surface to be cleaned for cleaning and descaling; The vacuum cleaner is characterized by: an impeller is arranged in the suction nozzle assembly and rotated by the suction force; A brush member and/or a scraper member are connected to the entire impeller or the part of the impeller and are in contact with the surface to be cleaned; The entire impeller or the partial impeller is used as a rotating brush and/or as a rotating scraper. 2. Vacuum cleaner according to claim 1, characterized in that: said brush and/or said scraper is in the form of a single said brush or a plurality of said brushes, a single said scraper or A plurality of brushes, or a combination of a plurality of brushes and scrapers, are connected to the impeller in a spiral shape. 3. A vacuum cleaner according to claim 1 or 2, characterized in that the length of said impeller is greater than half of said inner longitudinal length of said suction nozzle assembly. 4. Vacuum cleaner according to claim 1, characterized in that the brush element and/or the scraper element extend from a blade of the impeller towards the outer circumference. 5. Vacuum cleaner according to any one of claims 1 to 4, characterized in that a housing is arranged on the outside of the impeller, the housing being open towards the floor. 6. A vacuum cleaner according to any one of claims 1 to 5, characterized in that: An air inlet for inhaling air from the outside is provided adjacent to both ends of the suction nozzle assembly, and the air inlet is separately provided from an open surface facing the surface to be cleaned; an air outlet is formed at a top end portion of the hose and/or the extension tube connected to the central portion of the suction nozzle assembly; and The air inlets near the two ends are distributed symmetrically with respect to the extension axis of the air outlet. 7. The vacuum cleaner according to claim 6, characterized in that: The diameter of the impeller is larger at the two ends and smaller in the center. 8. A vacuum cleaner according to any one of claims 1 to 5, characterized in that: An air inlet for inhaling air from the outside is provided at the central part of the suction nozzle assembly, and the air inlet is separately provided from an open surface facing the surface to be cleaned; an air flow channel is formed at both ends of a receiving area of the impeller inside the suction nozzle assembly; and An air outlet is formed at a top end of the hose and/or the extension pipe connected to the central portion of the suction nozzle assembly. 9. A vacuum cleaner according to any one of claims 1 to 8, characterized in that: The diameter of the impeller is set according to its torque on the carpet greater than 50gr.cm (gram·centimeter) but less than 200gr.cm. 10. A vacuum cleaner according to claim 9, characterized in that: Said torque is greater than 80 gr.cm but less than 100 gr.cm. 11. In a vacuum cleaner, it includes: an electric blower motor for generating suction force, a housing for accommodating the electric blower motor; formed in the housing and located on the suction side of the electric blower motor a dust collection part; a hose and/or extension tube connected to the opening of the housing, and the opening is opened towards the dust collection part; a hose and/or extension tube located at the A switch control unit used to drive the work of the electric blower motor at the middle part of the hose or adjacent to the connecting portion of the extension pipe; and a connection with the hose and/or the extension pipe The suction nozzle assembly connected to the top, wherein the cleaning surface to be cleaned can be cleaned and descaled by utilizing the suction force of the electric blower motor. The vacuum cleaner is characterized by: an impeller is arranged in the suction nozzle assembly and is forced to rotate by the suction force; A rotating brush is provided coaxially with the impeller and rotates integrally, and a partition wall or the like is not provided between the impeller and the rotating brush. 12. The vacuum cleaner according to claim 11, characterized in that: The lower surface of the rotary brush that abuts against the floor surface is open, but a part of the surface where the impeller exists is not open. 13. Vacuum cleaner according to claim 11 or 12, characterized in that the diameter of said rotating brush including a brush member or a scraper member is larger than the diameter of said impeller. 14. A vacuum cleaner according to any one of claims 11 to 13, characterized in that: The diameter of a shaft of said rotating brush excluding a brush member or a scraper member is smaller than the diameter of said impeller. 15. A vacuum cleaner according to any one of claims 11 to 14, characterized in that: A scraper member is connected to a shaft of the above-mentioned rotating brush. 16. A vacuum cleaner comprising: an electric blower motor for generating suction force, a housing for accommodating the electric blower motor; A dust collection part; a hose and/or an extension tube connected to the opening of the housing, the opening opening towards the dust collection part; a hose and/or extension tube located in the middle of the hose and/or the extension tube A switch control unit used to drive the electric blower motor at the position or adjacent to the connecting portion of the flexible pipe and the extension pipe; and a suction device connected to a top end of the flexible pipe and/or the extension pipe Air pipe nozzle assembly, wherein the cleaning surface to be cleaned can be cleaned and descaled by utilizing the suction force of the electric blower motor; The vacuum cleaner is characterized by: A regular path of air flow is created by first impinging the impeller with all or part of the fluid sucked in from the outside of the suction nozzle assembly, and then the fluid passes over the surface to be cleaned and is sucked into the body of the vacuum cleaner . 17. The vacuum cleaner according to claim 16, characterized in that: A single or a plurality of nozzles are provided for blowing out the fluid in the direction of rotation of the impeller. 18. A vacuum cleaner according to claim 16 or 17, characterized in that: An air inlet and an air outlet inside the above-mentioned suction nozzle assembly are not in a straight line. 19. A vacuum cleaner according to any one of claims 1 to 18, characterized in that: The switch manipulation unit includes a switch group for controlling the power supply and the suction force on and off, and also includes a device for transmitting manipulation signals from the switch manipulation unit to the main body of the vacuum cleaner in a wireless transmission manner. 20. A vacuum cleaner according to any one of claims 1 to 19, characterized in that: The rotational speed of the impeller is greater than 1,000 r/min but less than 10,000 r/min (rotation per minute). 21. A vacuum cleaner according to any one of claims 1 to 20, characterized in that: The area of an air inlet for sucking in air from the outside of said suction nozzle assembly is such that the static pressure inside said suction nozzle assembly on the carpet is maintained at greater than -3,000Pa but less than - It is set within the range of 200Pa. 22. A vacuum cleaner according to any one of claims 1 to 21, characterized in that: The vanes of the impeller vane set are in a twisted structure. 23. A vacuum cleaner according to any one of claims 1 to 22, characterized in that: The bottom and side of the housing are provided with wheels, and the difference in the degree of sinking into the surface to be cleaned is used to make the impeller respond to at least a floor surface such as a carpet or a floor. function to change its rotational speed. 24. A vacuum cleaner according to any one of claims 1 to 23, characterized in that: The rotation speed on the carpet is greater than 1,000 r/min but less than 10,000 r/min, and the rotation speed on the floor is smaller than that on the carpet. 25. A vacuum cleaner according to claim 24, characterized in that: The rotational speed on the carpet is greater than 3,000r/min but less than 4,000r/min. 26. A vacuum cleaner according to claim 24, characterized in that: The rotation speed on the carpet is greater than the rotation speed when the above-mentioned suction nozzle assembly is lifted. 27. The vacuum cleaner according to claim 24, characterized in that: The rotational speed on the carpet is greater than the rotational speed on the floor and the rotational speed on the floor is greater than the rotational speed when the suction nozzle assembly is lifted. 28. The vacuum cleaner according to claim 24, characterized in that: The torque of the impeller on the carpet is greater than the torque of the impeller when the suction nozzle is lifted. 29. A vacuum cleaner according to any one of claims 1 to 23, characterized in that: A mechanism is provided to automatically reduce or stop the rotation speed of the impeller when the suction nozzle assembly is lifted. 30. A vacuum cleaner according to any one of claims 1 to 29, characterized in that: A device for enhancing the closing function of the floor opening is provided. 31. In the suction nozzle assembly of a vacuum cleaner, the surface to be cleaned is cleaned and descaled by the suction force generated by an electric blower motor, and an impeller rotating according to the suction force is installed inside; A suction nozzle assembly for a vacuum cleaner is characterized by: a brush member and/or a scraper member is attached to the whole of the impeller or a part of the impeller so as to contact the surface to be cleaned, and The entire impeller or a part of the impeller acts as a rotating brush and/or a rotating scraper element. 32. The suction nozzle assembly of claim 31, wherein: The brush member and/or the scraper member is a single brush member or a plurality of brush members; a single scraper member or a plurality of scraper members; or a plurality of the scraper members The combination of the brush and the scraper is connected to the impeller in a spiral shape. 33. The suction nozzle assembly of a vacuum cleaner according to claim 31 or 32, characterized in that: The length of the impeller is greater than half of the inner length of the suction nozzle assembly. 34. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 33, characterized in that: The brush member and/or the scraper member extend from the blades of the impeller toward the outer peripheral side. 35. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 34, characterized in that: A housing is provided outside the impeller, and the housing is opened toward a floor surface side. 36. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 35, characterized in that: An air inlet for inhaling air from the outside is provided adjacent to both ends of the suction nozzle assembly, and the air inlet is separately provided separately from an open surface facing the surface to be cleaned; an air outlet is formed at a top end of the hose and/or the extension tube connected to the central portion of the suction nozzle assembly; and The air inlets near the two ends are distributed symmetrically with respect to the extension axis of the air outlet. 37. The suction nozzle assembly of claim 36, wherein: The diameter of the impeller is larger at both ends and smaller in the center. 38. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 35, characterized in that: An air inlet for inhaling air from the outside is provided at the central part of the suction nozzle assembly, and the air inlet is separately provided from an open surface facing the surface to be cleaned; an air flow channel is formed at both ends of a receiving area of the impeller inside the suction nozzle assembly; and An air outlet is formed at a top end of the hose and/or the extension pipe connected to the central portion of the suction nozzle assembly. 39. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 38, characterized in that: The diameter of the impeller is set according to the fact that the impeller has a torque greater than 50 pr.cm but less than 200 gr.cm on the carpet. 40. The suction nozzle assembly of claim 39, wherein: The aforementioned torque is preferably greater than 80 gr.cm but less than 100 gr.cm. 41. Vacuum cleaners having suction nozzle assemblies including: An electric blower motor for generating suction force; a casing for accommodating the electric blower motor; a dust collection part formed in the casing and located on a suction side of the electric blower motor; a The hose and/or extension tube connected to the opening of the housing, the opening part is opened towards the dust collection part; one is located in the middle of the hose and/or the extension tube or is located A switch control unit used to drive the electric blower motor at the vicinity of the connecting part of the extension pipe; and a suction nozzle assembly connected with a top end of the hose and/or the extension pipe , wherein the cleaning surface to be cleaned can be cleaned and descaled by utilizing the suction force of the electric blower motor; A suction nozzle assembly for a vacuum cleaner is characterized by: an impeller is disposed inside the suction nozzle assembly and rotated by the suction force; a rotating brush is arranged coaxially with the impeller and rotates integrally; and A partition wall or the like is not provided between the impeller and the rotating brush. 42. The suction nozzle assembly of claim 41, wherein: The lower surface of the rotating brush against the floor surface is open, but a part of the surface where the impeller exists is not open. 43. The suction nozzle assembly of a vacuum cleaner according to claim 41 or 42, characterized in that: The diameter of the rotating brush comprising a brush or a scraper is larger than that of the impeller. 44. A suction nozzle assembly for a vacuum cleaner according to any one of claims 41 to 43, characterized in that: A shaft of the rotating brush excluding a brush member or a scraper member has a diameter smaller than that of the impeller. 45. A suction nozzle assembly for a vacuum cleaner according to any one of claims 41 to 44, characterized in that: A scraper member is connected to a shaft of the rotating brush. 46. A vacuum cleaner having a suction nozzle assembly comprising: an electric blower motor for generating suction force, a housing for accommodating said electric blower motor; A dust collection part on the suction side of the blower motor; a hose and/or extension pipe connected to the opening of the housing, the opening part is opened towards the dust collection part; /or the middle part of the extension tube or the switch control unit located near the connecting part of the hose and the extension tube for driving the electric blower motor to work; and a switch control unit connected with the hose and/or A suction nozzle assembly connected to a top end of the extension pipe, wherein the cleaning surface to be cleaned can be cleaned and descaled by utilizing the suction force of the electric blower motor; A suction nozzle assembly for a vacuum cleaner is characterized by: All or part of the fluid sucked from the outside of the suction nozzle assembly first collides with the impeller to form a regular channel of air flow, and then the fluid passes through the surface to be cleaned and is sucked into the body of the vacuum cleaner. 47. The suction nozzle assembly of claim 46, wherein: Single or multiple nozzles are provided for blowing the fluid in the direction of rotation of the impeller. 48. The suction nozzle assembly of a vacuum cleaner according to claim 46 or 47, characterized in that: An air inlet and an air outlet inside the suction nozzle assembly are not on a straight line. 49. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 48, characterized in that: The rotation speed of the impeller is greater than 1,000r/min but less than 10,000r/min (rotation per minute). 50. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 49, characterized in that: The area of an air inlet for sucking in air from the outside of said suction nozzle assembly is such that the static pressure inside said suction nozzle assembly on the carpet is maintained at greater than -3,000Pa but less than - It is set within the range of 200Pa. 51. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 50, characterized in that: The vanes of the impeller vane set are in a twisted structure. 52. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 51, characterized in that: The bottom and side of the housing are provided with wheels, and the difference in the degree of sinking into the surface to be cleaned is used to make the impeller change in response to at least a floor surface such as a carpet or a floor. function of its speed. 53. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 52, characterized in that: The rotation speed on the carpet is greater than 1,000 r/min but less than 10,000 r/min, and the rotation speed on the floor is smaller than that on the carpet. 54. The suction nozzle assembly of claim 53, wherein: The rotational speed on the carpet is greater than 3,000r/min but less than 4,000r/min. 55. The suction nozzle assembly of claim 53, wherein: The rotation speed on the carpet is greater than the rotation speed when the above-mentioned suction nozzle assembly is lifted. 56. The suction nozzle assembly of the vacuum cleaner according to claim 53, characterized in that: The rotational speed on the carpet is greater than the rotational speed on the floor, and the rotational speed on the floor is greater than the rotational speed when the suction nozzle assembly mentioned above is lifted. 57. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 52, characterized in that: A mechanism is provided to automatically reduce or stop the rotation speed of the impeller when the suction nozzle assembly is lifted. 58. A suction nozzle assembly for a vacuum cleaner according to any one of claims 31 to 57, characterized in that: A device for enhancing the closing function of the opening of the floor surface is provided.

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