MXPA98009143A - Electric vacuum - Google Patents

Abstract

The present invention relates to an electric vacuum cleaner comprising a body having an electric fan and a dust chamber, a nozzle having an opening in its bottom or bottom, a suction passage that joins the interior of the worker to the powder chamber and a rotating brush including a rotor having bristles on a peripheral surface thereof and provided in the nozzle to rotate about a horizontal axis and such that, in operation, that powder is sucked with the air through the opening of the nozzle by an air flow produced by the electric fan through the suction passage, that sucked powder is collected in a bag or bag for dust housed in the chamber for dust and in such a way that a surface to be cleaned facing the opening, is brushed by the rotating brush to promote the separation of the dust from the surface, characterized in that the ro It is a hollow cylinder having a through hole passing through a peripheral wall thereof and because a reflux passage is provided to guide a sliding current of the electric fan into the rotor, such that the flow of Sliding electric fan blows the surface to be cleaned through the hole pass

Description

ELECTRIC VACUUM CLEANER BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an electric vacuum cleaner that includes a nozzle equipped with a rotating brush to promote separation of the dust from the surface being cleaned.

Description of the prior art It is known an electric vacuum cleaner that is provided with a rotating brush in a nozzle to suck the dust together with air, so that the separation of the dust from the surface that is cleaned is promoted by rubbing the surface by means of the rotating brush. Japanese published patent application No. H7-136082 discloses an electric vacuum cleaner that promotes separation of the dust from the surface that is cleaned by directing the slipstream of an electric blower thereto to produce a sucked air flow. The structure of this vacuum is shown in Figures 17 to 19 of the drawings attached to this specification. Figure 17 is a sectional side view of the entire vacuum cleaner and Figure 18 is a sectional top plan view of a nozzle. This vacuum cleaner is of the manual vacuum type, the nozzle 71 is arranged in the part REF .: 28774 bottom of the body 72 of the vacuum cleaner. A dust bag 74 is adjusted downstream of an electric fan 73. The body 72 includes a cover 75, in which the electric fan 73 and the dust bag 74 are housed. The cover 75 includes a cover 76 for putting the bag 74 for the powder in the body 72 and removing it from the body. The body 72 also includes a handle 77 for moving the vacuum cleaner. The cover 75 has an outlet for the air 84 to discharge the sliding current of the fan 73 out of the body 72. The nozzle 71 has a suction hole 78 formed in its bottom or bottom to suck the powder. The suction hole 78 and the dust bag 74 are connected by a suction passage or passage 79. The nozzle 71 also has a blow outlet 80 formed in its lower part and in front of the suction orifice 78. The blow outlet 80 and the body 72 are connected by a reflux passage or passage 81. The operation of the electric fan 73 produces a suction flow 82 and a slip current at the same time. A part 83 of the sliding current is discharged from the body 72 of the vacuum cleaner through the outlet 84 for air. The other part 85 of the slipstream is directed through the reflux passage 81 and the blow outlet 80 to the surface 90 which is cleaned.

This blows or separates the powder from the surface 90. The blown powder is sucked into the suction hole 78 by the suction flow and flows through the suction passage 79 into the bag 74 for the powder, where it is collected. Air flows from the suction hole 78 through the suction passage 79, the bag 74, the reflux passage 81 and the blow outlet 80 in order on the surface 90 and then returns to the suction hole 78. This forms a 'circulation passage to circulate a flow of sucked air. Figure 19 is a sectional side view of another nozzle 86 having a different structure. The nozzle 86 has a blow outlet 87, which is similar to the outlet 80 and a suction hole 88 formed in the rear part of the outlet 87. The nozzle 86 is equipped with a rotating brush 89 in the suction hole 88. The brush 89 can be rotated by the driving force transmitted from an electric motor by means of a band. The brush 89 can brush the surface 90 that is cleaned. Without the brush 89, the air flow of the outlet 87 might not be able to separate the dust from a carpet or the like to which it is likely to stick or stick. The brush 89 can scrape or throw the powder to separate it from the surface 90. According to the previous vacuum, because the blowing outlet and the suction hole are isolated from each other by a wall, the air does not flow from the outlet directly to the rotating brush. Therefore, waste yarns, hair, etc., tend to adhere to the brush. In addition, part of the air from the blow outlet is likely to flow out of the nozzle through the space between the nozzle and the surface. Consequently, blown dust from the surface that is cleaned can be spread around the nozzle and the suction capacity of the vacuum cleaner may decrease.

BRIEF DESCRIPTION OF THE INVENTION An object of the present invention is to provide an electric vacuum comprising a body having an electric fan and a dust chamber, a nozzle having an opening or hole in its bottom or bottom, a passage or suction passage connecting an inner side of the nozzle to the dust chamber and a rotating brush including a rotor having bristles on a peripheral surface thereof and provided on the nozzle to rotate about a horizontal axis and thus in operation in such a way that the dust is sucked with the air through the opening of the nozzle by means of a flow of air produced by the electric fan through the suction passage, the sucked powder is collected in a bag for the hosted dust In the chamber for dust and a surface to be cleaned facing the opening, it is brushed by the rotating brush to promote dust separation of the surface, where the powder is prevented from adhering to the rotating brush, the powder is prevented from spreading around the vacuum cleaner and a high and stable suction capacity is maintained. To obtain the above object, according to one aspect of the present invention, the rotor is a hollow cylinder having a through hole passing through a peripheral wall thereof and a passage or reflux passage is provided to guide a The sliding current of the electric fan to the interior of the rotor, in such a way that the sliding current of the electric fan blows the surface to be cleaned through the through hole. In this electric vacuum, the air in the nozzle flows through the suction passage to the dust chamber, where the powder is removed by the dust bag and further flows through the reflow passage to the rotor of the rotating brush in the mouthpiece. The air in the rotor gushes through the through hole on the surface to be cleaned and returns to the nozzle. As a result, air circulates between the nozzle and the body of the vacuum cleaner. The air that gushes out through the hole or hole on the surface flows out of the rotor. Accordingly, the air jet prevents the powder from adhering to the bristles and blows to expel the adhering powder.

Since the suction force is developed in the nozzle by the electric fan, the air jet is sucked again into the suction passage. Consequently, the circulating air does not flow out of the nozzle and therefore does not spread around the nozzle. To obtain the above object, according to another aspect of the present invention, the rotor is a hollow cylinder having a through hole passing through a peripheral wall thereof and a suction fan, to suck air from the outside from the nozzle to the rotor is attached to the rotor, in such a way that the air sucked by the suction fan blows the surface to be cleaned through the through hole. The suction fan sucks the air from the outside of the nozzle to the rotor and sucked air gushes through the through hole on the surface to be cleaned. The jet of air flows out of the rotor to prevent dust from adhering to the bristles of the brush. Since the suction force is developed in the nozzle by the electric fan, the jet of air through the hole or orifice is sucked into the suction passage without flowing out of the nozzle. To obtain the above object, according to still another aspect of the present invention, a passage or reflow passage is provided to guide a sliding current of the electric fan to a vicinity of one end of the rotor and a passage or step is provided. of air to direct the guided sliding current of the electric fan to the peripheral surface of the rotor along the axis, at the end of the rotor, in such a way that the sliding current of the electric fan blows the surface to be cleaned through the air passage. In this vacuum, the air in the nozzle flows through the suction passage to the dust chamber, where the powder is separated by the dust bag and returns to the nozzle through the reflux passage. The return air is directed to the peripheral surface of the rotor and at the same time blows the surface that is cleaned. The air directed to the peripheral surface prevents the dust from adhering to the bristles and blows to expel the adhering dust. Since the suction force is developed in the nozzle by the electric fan, the air jet is sucked again into the suction passage. Consequently, the air does not flow out of the nozzle and therefore does not spread around the nozzle. In addition, the decrease in suction force is suppressed. Specifically, a pulley for receiving a rotational force is attached to the end of the rotor, a through hole is provided in the pulley as the passage or passage of air and a fan is provided in the through hole to send air to the peripheral surface of the pulley. rotor. This fan rotates with the pulley and directs the air from the reflux passage efficiently to the peripheral surface of the rotating brush. A fan for sending air to the peripheral surface of the rotor can be attached to one end of the rotor opposite the air passage and an air intake port can be provided to the nozzle in a position facing the fan. Although it may be difficult for air from the air passage to reach the end of the rotating brush opposite the air passage, the fan can supply air to the peripheral surface near this end. In addition, by taking the air from the outside inward, it is possible to keep the circulating air abundant and also prevent the body temperature of the vacuum cleaner from rising. For electric vacuum cleaners provided with the reflux passage, it is preferable that a separable filter for capturing the fine powders is provided in the reflux passage. Even if the fine dust leaks out of the dust bag, the filter captures the dust before the slipstream of the electric fan reaches the rotating brush. Therefore, the powder does not enter the nozzle. This prevents dust from adhering to the cleaned surface. Because the filter can be separated, it is very easy to separate the captured dust through the filter. It is also preferable that part of the reflow passage between the body and the nozzle comprises a flexible hose and one end of the hose can be attached to, and detached from the nozzle. When the end is separated from the nozzle, the hose can be used as a blower.

BRIEF DESCRIPTION OF THE DRAWINGS These and other objects and features of the invention will become clearer from the following description, taken in conjunction with the preferred embodiments with reference to the accompanying drawings in which: Figure 1 is a perspective view of an electric vacuum cleaner according to a first embodiment of the invention. Figure 2 is a rear view of the vacuum cleaner according to the first embodiment; Figure 3 is a sectional side view of the vacuum cleaner according to the first embodiment; Figure 4 is a bottom view of the vacuum cleaner according to the first embodiment with its bottom cover of the nozzle removed; Figure 5 are sectional views of the rotating brush in the nozzle of the vacuum cleaner according to the first embodiment and the bearing carriers in the nozzle; Figure 6 is a sectional view taken on line A-A of Figure 4; Figure 7 is a bottom view of an electric vacuum cleaner according to a second embodiment of the invention with its bottom cover of the nozzle removed; Figure 8 is a fragmentary perspective view of the nozzle housing of the vacuum cleaner according to the second embodiment; Figure 9 are sectional views of the rotating brush in the nozzle of the vacuum cleaner according to the second embodiment and the bearing carriers in this nozzle; Figure 10 is a bottom view of an electric vacuum cleaner according to a third embodiment of the invention with its bottom cover of the nozzle removed; Figure 11"is a bottom view of an electric vacuum cleaner according to a fourth embodiment of the invention with its bottom cover of the nozzle removed; Figure 12 is a sectional view of the rotary brush in the vacuum cleaner nozzle according to FIG. the fourth mode and the bearing carriers in this nozzle; Figure 13 is a bottom view of an electric vacuum cleaner according to a fifth embodiment of the invention with its bottom cover of the removed nozzle; Figure 14 is a sectional view of the rotating brush in the vacuum cleaner nozzle according to the fifth embodiment and the bearing carriers in this nozzle; Figure 15 is a bottom view of an electric vacuum cleaner according to a sixth embodiment of the invention with its bottom cover of the nozzle removed; Figure 16 is a sectional view of the rotating brush in the nozzle of the vacuum cleaner according to the sixth embodiment and the bearing carriers in this nozzle; Figure 17 is a sectional side view of a conventional electric vacuum cleaner; Figure 18 is a sectional top view of the vacuum cleaner nozzle shown in Figure 17; and Figure 19 is a sectional side view of another nozzle of a conventional electric vacuum cleaner.

Description of the preferred embodiments Hereinafter, embodiments of the electric vacuum cleaner of the present invention are described with reference to the drawings. Figures 1 and 2 show the appearance of the electric vacuum cleaner of a first embodiment. Figure 1 is a perspective view of the vacuum cleaner as viewed obliquely from the front. Figure 2 is a rear view of the vacuum cleaner. Some internal parts of the vacuum cleaner are also shown in these figures. This electric vacuum includes a body 1 and a nozzle 3. The nozzle 3 is adjusted to the bottom or bottom of the body 1 in such a way that the vacuum is of the manual vacuum type. The body 1 includes a handle 2 formed in its upper part to move the vacuum cleaner. The body 1 of the vacuum cleaner has a fan chamber 12 formed in its lower part, which houses an electric fan 13 to produce an air flow. The body 1 also has a chamber 14 for the powder formed on the fan chamber 12. The dust chamber 14 houses a bag or bag 15 for the powder. The front part of the body 1 is closed with a cover 11b, which can be opened in such a way that a bag or bag 15 for dust can be introduced and removed in the chamber 14. The closure of the cover 11b closes this chamber 14 hermetically. The upstream side (suction stream) of the fan chamber 12 communicates with the chamber 14 for the powder. The body 1 of the vacuum cleaner has exit slits 11c formed through a left portion of its front part to discharge part of the sliding current of the fan 13 out of the vacuum cleaner. The body 1 also has a hollow or lid cavity formed in its back for the user to transport the vacuum cleaner. The vacuum includes an ignition switch 16 and a power cord 17. The body 1 is equipped with rear wheels 18 at its bottom to move. The nozzle 3 includes a casing or sleeve 31 and a lower cover 32, which is screwed to the casing 31. The nozzle 3 is equipped with a rotating brush 5 covered with the casing 31 and the cover 32. The nozzle 3 and the body 1 of the vacuum cleaner are connected by a hose 6 on the suction side and a hose 7 on the discharge side. The hose 6 on the suction side joins the interior of the nozzle 3 and the chamber 14 for the powder. The hose 7 on the discharge side joins the downstream side (sliding current) of the fan chamber 12 and the interior of the nozzle 3 by means of the rotary brush 5. Figure 3 shows a section of the vacuum cleaner, as shown in FIG. see from the left side and figure 4 shows the nozzle 3 with the cover 32 removed, as seen from the bottom. The body 1 of the vacuum includes protrusions or protrusions formed on both sides near its bottom. The nozzle 3 is supported on the protuberances Ha in a rotatable manner in the forward and backward directions. The rotating brush 5 extends near the front end of the nozzle 3 horizontally between the right and left sides of the nozzle. The brush 5 has a pulley 52 fixed to one of its ends. The pulley 52 is attached to the shaft or shaft 13a of the fan 13 by a band 33. The band 33 transmits the rotation of the fan 13 to the pulley 52 to rotate the brush 5. The lower cover 32 has a laterally long suction opening 32a in the position facing the brush 5 and the rotating brush 5 is exposed to the outside through the suction opening 32a. The interior of the nozzle 3 is divided by a wall 31a formed behind the rotating brush 5. The wall 31a has a suction opening 31b formed near its right end. Behind the suction opening 31b a tube 34 is connected which is connected to the suction side, the front end and the rear end of which are connected to the opening 31b and the hose 6 on the suction side respectively. On the left side in the nozzle 3 a tube 35 is connected which is connected to the discharge side, to the rear end * of which an end 7a of the hose 7 of the discharge side is inserted. The hose 7 on the discharge side is flexible and the user can freely connect or disconnect the end 7a of the hose a or the rear end of the tube 35. The peripheral surface of the end 7a is tapered for easy connection and disconnection. The end 7a is equipped with a separable filter 7b in order to capture the fine dust that has leaked out of the bag 15 for the powder. Figure 5 consists of sectional views of the rotating brush 5 and the bearing carriers 41 and 42 for holding the rotating brush 5. The rotating brush 5 includes a hollow cylindrical rotor 51 and spiral rows of bristles 512 implanted on the outer surface of the rotor 51 and that extend along the rotor. The rotor 51 has a variety of slits 511 for the air formed to pass through its wall from the inside to the outer peripheral surface. In the rotor 51, a brush shaft 53 is arranged coaxially extending through the rotor 51 and protruding from both ends of the rotor. One end of the rotor 51 is closed and the pulley 52 is fixed to the other end of the rotor. The pulley 52 includes a protrusion and an outer peripheral part, which are joined by radial parts. The protrusion and the peripheral part are fixed to the brush shaft 53 and the rotor 51 respectively with an adhesive or the like. This jointly fixes the rotor 51, the pulley 52 and the shaft 53. The radial parts define spaces 521 therebetween.

The ends of the brush shaft 53 are supported by a pair of bearing carriers 41 and 42 which have external recesses 41a and 42a respectively, formed at their centers. A bearing 43 is forced or snapped into each of the recesses 41a and 42a. Each end of the shaft 53 is forced to the associated bearing 43 and equipped with a nut 54, such that this shaft and the rotor 51 are rotatably supported. The bearing carriers 41 and 42 are adjusted in ribs 31c and 31d, respectively, which are formed in the nozzle housing 31, such that they are fixed in the nozzle 3. The bearing carrier 42 adjacent to the pulley 52 it has openings 42b, to which the front or front end of the tube 35 which connects to the discharge side is tightly adjusted. The downstream side of the fan chamber 12 communicates with the interior of the rotating brush 5 through the hose 7 on the discharge side, the tube 35 which connects to the discharge side, the openings 42b of the carrier and the spaces 521 of the pulley. The interior of the brush 5 communicates with the interior of the nozzle 3 through the slits 511. This forms a reflux passage for the sliding current of the fan 13. Figure 6 shows a sectional view taken on the line AA of the Figure 4. The bristles 512 are arranged in two spiral rows opposite each other and the rows of the bristles 512 are twisted 360 degrees between both ends of the rotor 51. The slots 511 are arranged in two pairs of two spiral rows, such so that the two rows of each pair extend along the row of the bristles 512 with the last ones between them. The outer ends of the bristles 512 protrude slightly from the suction hole 32a without coming into contact with the lower cover 32. The rotating brush 5 is rotated in the counterclockwise direction in Figure 3 and the bristles 512 brush the surface that is underneath nozzle 3 backwards. This separates the dust from the surface that is cleaned. The rows of bristles 512 and slots 511 could be arbitrary in number and form. The air flow in this vacuum will be described below. When the ignition switch 16 is activated to supply electric power, the electric fan 13 and the brush 5 rotate at the same time. The rotation of the fan 13 develops a suction force sucking the air through the suction opening 32a to the nozzle 3. The suctioned air flows through the opening 31b in the wall, the tube 34 which is connected to the side of suction and hose 6 on the suction side, in order, to the bag or sack 15 for the powder. The air leaks out of the bag 15 and reaches the suction side of the fan chamber 12. This upstream flow to the fan 13 sucks the powder that is on the surface, under and around the nozzle 3. The sucked powder is collected in the bag 15. The air on the suction side of the fan chamber 13 is sent next to discharge this chamber and form a sliding current. Part of the slipstream is discharged out of the body 1 of the vacuum through the outlet slits 11c. The rest of the sliding current flows through the hose 7 on the discharge side, the tube 35 that connects to the discharge side, the holes 42b of the carrier and the spaces 521 for the pulleys, in order, to the interior of the brush rotary 5. Then, the air in the brush 5 gushes through the slits 511 into the nozzle 3. The rotation of the brush 5 causes the slits 511 to be facing downwards, in one cycle. Part of the air jet collides with the surface under the nozzle 3 and separates the powder therefrom. The jetting air through the slits 511 is sucked through the opening 31b of the wall by the suction force of the fan 13 and circulates through the aforementioned flow passage. The air jet, which exits through the slits 511 of the brush, acts to prevent the powder from adhering to the bristles 512 and to blow the adhering powder therefrom. This air does not flow out of the nozzle 3 and therefore does not blow dust from the surface around the nozzle 3. Even if the suction opening 32a at the bottom of the nozzle 3 is blocked with a thick carpet or the like, which is flexible, the interior of the nozzle 3 is maintained fed with circulating air. Therefore, the suction force of the vacuum cleaner does not decrease. Because the filter 7b is equipped at the end 7a of the hose on the discharge side 7, the fine powder is hardly contained in the jet of air exiting through the slits 511 of the brush. Consequently, the powder does not adhere again to a surface which has been cleaned by the vacuum cleaner. Because the filter 7b can be separated, it is easy to clean the filter. The outer peripheral surface of the filter 7b is threaded and the inner peripheral surface of the end 7a of the hose is threaded to mate with the filter 7b. The filter 7b could be equipped in another way. The filter 7b could be positioned in the body 1 of the vacuum cleaner, the hose 7 on the discharge side or the connecting pipe on the discharge side 35. It is essential that the filter 7b be positioned in the passage through which the flow of Sliding of the fan 13 flows to the rotary brush 5. When the hose 7 of the discharge side is not connected to the tube 35 which is connected to the discharge side, the sliding current of the fan 13 is discharged from the end 7a of the hose. In this case, the hose 7 on the discharge side can be used as a fan to blow the powder. This manual vacuum can be used primarily to clean flat floors, but it can also be used to clean other floors with the fan. Hereinafter, other embodiments of the present invention will be described. These vacuums differ only in the structure of the nozzle of the previous vacuum cleaner. The same reference numbers are provided to identical and similar parties and redundant or duplicate explanations of these parts will be omitted. Figures 7 to 9 show the nozzle 3 of the vacuum cleaner according to a second embodiment. Figure 7 is a bottom plan view of the nozzle 3 with the lower cover 32 removed, Figure 8 is a partial perspective view of the box 31 of the nozzle and Figure 9 are sectional views of the rotating brush 5 and the carriers of bearings 41 and 42. The end of the rotor 51 opposite the pulley 52 is open and a suction or intake fan 55 is fitted thereto. The bearing carrier 41 for supporting the end of the shaft 53 of the brush projecting therefrom has an opening 41b similar to the bearing carrier 42 for supporting the other end of the brush shaft 53. That end of the brush shaft 53 is adjusted to the bearing carrier 41 in the same manner as described above. The nozzle housing 31 has an air intake hole 31e in the position facing the bearing carrier 41. The interior of the hollow rotor 51 communicates with the exterior of the nozzle 3 through the opening of the carrier 41b and the intake hole 31e. The suction fan 55 includes a central protrusion 55a, a peripheral wall 55c and vanes 55b, which are joined to the protrusion 55a and the wall 55c and are inclined in relation to the brush axis 53. The protrusion 55a and the wall 55c are fixed to the shaft 53 and the end surface of the rotor 51, respectively, with an adhesive or the like. This fixes the rotor 51, the suction fan 55 and the brush shaft 53 together. The rotor 51 rotates together with the fan 55, which sucks air without resistance from the outside of the nozzle 3 to the rotor 51. When the switch 16 is turned on or activated to supply electrical power, the electric fan 13 rotates together with the rotating brush 5 and the suction fan 55. The rotation of the electric fan 13 develops a suction force, which sucks the air from the outside of the nozzle 3 through the suction opening 32a a the mouthpiece The suctioned air circulates through the circulation passage as described for the first mode.

Moreover, in this embodiment, the suction fan 55 sucks the air from the outside of the nozzle 3 directly to the rotary brush 5. This sucked air is mixed with the air that has returned through the reflux passage to the brush 5 and gushes out through the slits 511 of the brush 5. As the dust collected in the bag or bag 15 for the powder increases in quantity, the air sucked through the suction opening 32a to the nozzle 3 decreases in quantity, but the air sucked into the rotating brush 5 by the suction fan 55 increases in quantity. Accordingly, regardless of the amount of powder in the bag 15, the powder is surely prevented from adhering to the bristles 512 and the ability of the vacuum cleaner to suck the powder from the surface below the nozzle 3 is maintained high. Even if the hose 7 on the discharge side is disconnected from the tube that connects to the discharge side 35, the suction fan 55 sucks the air into the rotary brush 5 and the sucked air gushes through the slots 511 of the brush at the interior of the nozzle 3. This contributes extensively to preventing dust from adhering to the bristles 512 and to keeping the ability of the vacuum cleaner to suck the dust high. It could therefore be possible to omit the reflux passage extending from the discharge side of the fan chamber 12 to the rotary brush 5. The electric vacuum cleaner of a third embodiment will now be described. Figure 10 is a bottom plan view of the nozzle 3 in this embodiment with the cover 32 removed. In the first embodiment, the tube 35 that connects to the discharge side is provided in the nozzle 3 and this tube 35 is used as part of the reflux passage of the discharge side of the fan chamber 12 to the rotary brush 5. In this embodiment, however, the interior of the nozzle housing 31 is divided to form a chamber 35a which is connected to the discharge side and this chamber 35a is used as the part of the reflux passage within the nozzle 3. The enclosure 31 The nozzle is made of resin. When the shell 31 is molded of resin, a partition wall 31f is formed therein. When the lower cover 32 is adjusted to the nozzle housing 31, the bottom of the wall 31f is in close contact with the upper surface of the cover 32. The wall 31f is joined with ribs 3Id, which retain the carrier 42. of bearings. Accordingly, the connecting chamber 35a communicates with the interior of the rotating brush 5. The wall 31f has an opening formed through its rear end to insert the hose 7 on the discharge side and the end 7a of the hose 7 can be connected to the opening separable. According to this structure, it is not necessary to provide an element similar to the connecting tube 35. Accordingly, the nozzle 3 is easier to assemble and can be manufactured at lower cost. Now the electric vacuum cleaner of a fourth mode will be described. Fig. 11 is a bottom plan view of the nozzle 3 in this embodiment with the cover 32 separated and Fig. 12 is a sectional view of the rotating brush 5 and the bearing carriers 41 and 42 for holding the brush 5. The rotating brush 5 includes a rotor 51 having two spiral ribs or ribs formed on its outer surface and bristles 512 implanted on the peripheral surfaces of the shoulders of the rotor 51. The rotor 51 is manufactured by resin molding and has a central bore, through from which the brush axis 53 extends. The rotor 51 has no grooves for air like the grooves 511, which are formed through the cylindrical walls of the rotors 51 of the first to third modes. A pulley 52 adheres or is otherwise secured to the end of the discharge side of the rotor 51. The pulley 52 includes an outer peripheral part., which engages with the web 33. The pulley 52 also includes a protrusion 523 having a central bore formed therethrough, through which the brush shaft 53 extends. The peripheral part and the protrusion 523 are joined by radial ribs 521, defining spaces therebetween. The interior of the pulley 52 is a passage 522 for air, through which the sliding current of the electric fan 13 flows axially. The other end of the rotor 51, near the suction opening 31b includes a flange 513 and a short cylinder extending axially from the flange 513 to form a concavity therein. The flange 513 prevents the sucked air from passing through it and the dust to fly. In order to reflux a greater amount of the slipstream of the fan 13, it is preferable that the air passage 522 in the pulley 52 be as large as possible in diameter and area, but the diameter and area of the passage are limited by the diameter of the pulley. The amount of air flowing through the passage 522 depends on the area of the slots in the outlet 11c of the body 1 of the vacuum cleaner, but it can also be adjusted arbitrarily with the rotational speed of the rotor 51. The bearing carriers 41 and 42 support both ends of the shaft 53 of the brush by means of bearings 43. The ends of the shaft 53 are equipped with nuts 54 for holding on the bearings 43. The bearing carrier 42 near the pulley 52 has openings 42b, through which the The sliding current of the fan 13 flows into the passage 522 for air, in the pulley 52. The bearing carrier 41 near the flange 513 has no openings. The bearing carriers 41 and 42 are fitted to the ribs 31c and 31d respectively, which are formed on the nozzle casing 31. The carriers 41 and 42 are fixed to the ribs 31c and 31d by the lower cover 32 fitted to the bottom of the casing 31. This causes the brush 5 to be rotatably supported and brings the carrier 42 into close contact with the front end of the tube 35. which connects to the discharge side. Now we will describe the air flow in this vacuum cleaner. When the ignition switch 16 is activated to supply electric power, the electric fan 13 and the rotary brush 5 rotate at the same time. The rotation of the fan 13 develops a suction force which sucks the air through the suction opening 32a to the nozzle 3. The sucked air flows through the opening 31b of the wall, the tube 34 which is connected to the side of suction and hose 6 on the suction side, in order, to chamber 14 for the powder. The air leaks out of the bag 15 for the powder in the chamber 14 and reaches the suction side of the fan chamber 12. The flow upstream of the fan 13 sucks the powder that is on the surface, under and around the nozzle 3. The sucked powder is collected in the bag or bag 15. The air that is on the suction side of the chamber 12 of the fan is sent to the discharge side of this chamber and forms a sliding current. Part of the slipstream is discharged out of the body 1 of the vacuum through the outlet slits 11c. The rest of the current flows through the hose 7 on the discharge side, the tube 34 that connects to the discharge side, the openings 42b of the support carrier 42 and the air passage 522 of the pulley 52, in order and jetting out of the rotating brush 5. Jet air flows along the spiral ridges of the brush 5. Part of the air blown through the spaces between the bristles 512 collides with the surface below the nozzle 3 and separates the powder from it. The air around the brush 5 is sucked through the opening 31b of the wall and circulates through the circulation passage. The air jet (creep current) exiting to the outside of the rotating brush 5 acts to prevent dust from adhering to the bristles 512 and to expel the powder adhering thereto. This air does not flow out of the nozzle 3 and therefore does not blow dust from the surface around the nozzle 3. Even if the suction opening 32a at the bottom of the nozzle 3 is blocked with a thick carpet or the like, which is flexible, the interior of the nozzle 3 is supplied with circulating air. Accordingly, the suction force of the vacuum cleaner does not decrease greatly. In comparison with the first to third embodiments, the cylindrical wall of the rotor 51 included in the rotating brush 5 can be thick, but the rotor can be small in external diameter. This allows the nozzle 3 to be smaller, but keeps the rotary brush 50 with a high resistance. Furthermore, it is not necessary to form air slits through the cylindrical wall of the rotor 51 and therefore the manufacturing efficiency is improved. The peripheral surface of the rotor 51 could be cylindrical without spiral protrusions. However, it is preferable that the rotor 51 has spiral projections, because its lateral surfaces make it easier to direct to the surface below the nozzle 3 the sliding current of the fan 13, which reaches a jet to the outside of the rotor 51. This makes it easier to separate the dust from the surface that is cleaned. Instead of providing the tube 35 which connects to the discharge side in the nozzle, the interior of the nozzle housing 31 could be divided to form the chamber 35a which is attached to the discharge side as part of the reflux passage, as in the third modality.

Now a fifth modality will be described. The electric vacuum cleaner of this embodiment is different from tof the fourth embodiment, in the structure of the nozzle 3. Figure 13 is a bottom plan view of the nozzle 3 with the cover 32 removed and figure 14 are sectional views of the brush rotary 5 and the bearing carriers 41 and 42 provided in the nozzle 3. The rotating brush 5 includes the rotor 51 having the two spiral bosses formed on its external surface and the bristles 512 implanted on the peripheral surfaces of the rotor bosses 51. The rotor 51 is manufactured by resin molding and has a central bore, through which the brush shaft 53 extends. A pulley 52 is adhered or otherwise secured to the end of the rotor 51 on the downstream side. The pulley 52 includes an outer peripheral portion, which engages the web 33. The pulley 52 also includes a protrusion 523 having a central bore formed therethrough, through which the brush shaft 53 extends. . The peripheral portion and the prominence 523 are joined by radial blades 524 of the fan. The fan blades 524 not only define air passages therebetween, but also actively send air to the exterior of the rotating brush 5 by rotating it. The other end of the rotor 51 near the suction opening 31b includes the rim 513 and the short cylinder extending axially from the rim 513. The rim 513 prevents the suctioned air from passing through and the dust flying. The manner of holding the rotating brush 5 with bearing carriers 41 and 42 is similar to tfor the fourth embodiment. The operation of the blades 524 of the fan on the pulley 52 can be adjusted by its radius, shape and rotational speed. This vacuum has a passage of air circulation substantially similar to tof the fourth embodiment, but the blades 524 of the fan can send the sliding current from the electric fan 13 forcibly to the outside of the rotating brush 5. Even if the suction opening 32a at the bottom of the nozzle 3 is blocked, the blades 524 drive the circulating air to be fed into the interior of the nozzle 3. This maintains the suction force of the vacuum cleaner for longer and makes it less likely to decrease to allow a cleaning more efficient. Now a sixth modality will be described. The electric vacuum cleaner of this embodiment is different from tof the fifth embodiment in the structure of the nozzle 3. Figure 15 is a bottom plan view of the nozzle 3 with the cover 32 removed.

The envelope 31 of the nozzle of this vacuum cleaner has, on its right side wall and near its front end, the air intake orifice 31e shown in Figure 8 and explained in the second embodiment. This intake orifice 31e is for drawing air to the outside of the nozzle 3 to the outside of the rotating brush 5 by rotating the suction fan 55 shown in Figure 15. It is therefore preferable tthe intake orifice 31e be positioned on or around the extension of the brush shaft 5. Sectional views of the rotating brush 5 and the bearing carriers 41 and 42 are shown in figure 16. The rotating brush 5 includes the rotor 51 having the two spiral ridges formed on its surface external and the bristles 512 implanted in the peripheral surfaces of the projections of the rotor 51. The rotor 51 is manufactured by resin molding and has the central perforation, through which the brush axis 53 extends. At the end of the rotor 51 on the downstream side, the pulley 52 having the blades 524 of the fan therein is adhered or fixed in another manner, as explained in the fifth embodiment. A suction or intake fan 55 is equipped at the other end of the rotor 51 near the suction opening 31b. The suction fan 55 includes a central protrusion 55b, a peripheral wall 55c and a plurality of radial vanes 55a for attaching the protrusion 55b and the peripheral wall 55c and for sending air towards the center of the nozzle 3 by rotation. After it is placed on the brush axis 53, the protrusion 55b is adhered or otherwise fixed to the end of the rotor 51. This jointly fixes the rotor 51, the fan 55, the pulley 52 and the shaft 53. The blades 55a of the suction fan 55 are inversely inclined to the blades 524 of the fan of the pulley 52, such that the rotation of the rotor 51 causes the fan 55 and the pulley 52 to send air in opposite directions (towards the center of the rotating brush 5). ). The bearing carriers 41 and 42 support both ends of the brush shaft 53 by means of bearings 43. The ends of the shaft 53 are equipped with nuts 54 to be held on the bearings 43. The bearing carrier 42, near the pulley 52 has openings 42b, through which, the sliding current of the electric fan 13 can flow to the pulley 52. The bearing carrier 41 near the suction fan 55 also has openings 41b, through which outside air can flow to the suction fan 55. The bearing carriers 41 and 42 are adjusted to the ribs 31c and 31d respectively, which are formed on the nozzle casing 31. The carriers 41 and 42 are fixed to the ribs 31c and 31d by the lower cover 32 fitted to the bottom of the casing 31. This causes the rotary brush 5 to be held rotatably and brings the bearing carrier 42 into close contact with the front end of the connection tube 35. This also causes the openings 41b of the bearing carrier 41 to face the air intake hole 31e formed through the right side wall of the nozzle 3 near its front end. The air flow in this vacuum will be described below. The air on the suction side of the fan chamber 12 is sent to the discharge side of this chamber and forms a sliding current. Part of the slipstream is discharged out of the body 1 of the vacuum through the outlet slits 11c. The rest of the current flows through the hose 7 on the discharge side, the tube 35 that connects to the discharge side, the openings 42b of the bearing carrier 42 and the blades 524 of the fan on the pulley 52 in order and exit to the outside of the rotating brush. 5. If the suction hole 32a at the bottom of the nozzle 3 is blocked or as the dust collected in the dust bag 15 increases in amount, the slip current of the electric fan 13 decreases in quantity. When this current decreases in quantity, the air is sent without resistance from the outside of the nozzle 3 through the intake hole 31e of the nozzle housing 31, the openings 41b of the carrier and the suction fan 55 in order to the outside of the rotating brush 5 by the fan 55 rotating with the brush 5. This air is mixed with the sliding stream that is jetted through the pulley 52 and the mixture is sucked through the opening 31b of the wall and circulates. throughout the circulation passage. The suction fan 55 and the intake port 31e of the nozzle housing 31 make it possible to draw the air from the outside inwardly. This largely prevents the vacuum suction force from decreasing and consequently makes the cleaning efficiency higher. This also prevents the powder from adhering to the bristles 512 in the position remote from the pulley 52, which sends the sliding current from the electric fan 13. Furthermore, the circulating air temperature is prevented from rising and consequently, the lengthens the life of the electric fan 13. Instead of supplying the fan blades 524 on the pulley 52, a simple passage or air passage similar to passage 522 of the fourth embodiment could be provided. The vacuum cleaners according to the modalities are manual vacuum cleaners. The invention can also be applied to a vacuum cleaner of a separate type, in which the nozzle is separated from the body and can be moved independently. In this case, it is required that the nozzle must have a motor to drive or drive the rotating brush. It is also required that the nozzle and body be joined by a tube or hose as the reflux passage in addition to a tube or hose as the suction passage. Because the powder does not flow through the reflux passage, however, a tube or hose of small diameter is sufficient for it. Therefore, the separate type vacuum does not need to be particularly large and its operating capacity does not worsen. If part of the reflux passage is defined by part of the nozzle casing as is the case with the third embodiment, the increase in weight of the nozzle may be minimal. Obviously, many modifications and variations of the present invention are possible in light of the above teachings. Accordingly, it will be understood that, within the scope of the claims, the invention can be practiced in a manner different from that as specifically described. It is noted that, in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it refers.

Having described the invention as above, property is claimed as contained in the following:

Claims (15)

1. Claims 1. An electric vacuum comprising a body having an electric fan and a dust chamber, a nozzle having an opening in its bottom or bottom, a suction passage that joins the interior of the nozzle to the powder chamber and a rotating brush including a rotor having bristles on a peripheral surface thereof and provided in the nozzle to rotate about a horizontal axis and such that, in operation, that powder is sucked with the air through from the opening of the nozzle by an air flow produced by the electric fan through the suction passage, that sucked dust is collected in a bag or bag for the dust housed in the chamber for the powder and in such a way that a surface to be cleaned in front of the opening, it is brushed by the rotating brush to promote the separation of the dust from the surface, characterized in that the rotor is a hollow shaft having a through hole passing through a peripheral wall thereof and because a reflux passage is provided to guide a sliding current of the electric fan to the interior of the rotor, such that the sliding current of the fan Electric blows the surface to be cleaned through the through hole.
2. 2. The electric vacuum cleaner according to claim 1, characterized in that a separable filter is provided to capture the fine particulate dust in the reflux passage.
3. 3. The electric vacuum cleaner according to claim 1, characterized in that part of the reflow passage between the body and the nozzle comprises a flexible hose and one end of the hose can be attached to and detached from the nozzle.
4. The electric vacuum cleaner according to claim 1, characterized in that part of the reflux passage inside the nozzle is formed by dividing the interior of the nozzle with a part of the nozzle housing constituting the nozzle.
5. 5. The electric vacuum cleaner according to claim 1, characterized in that the electric vacuum cleaner is of the manual type with the nozzle arranged in the lower part of the body.
6. 6. An electric vacuum comprising a body having an electric fan and a dust chamber, a nozzle having an opening in its bottom or bottom, a suction passage connecting an interior of the nozzle with the chamber for the powder and a rotating brush including a rotor having bristles on a peripheral surface thereof and provided in the nozzle to rotate about a horizontal axis and such that, in operation, that powder is sucked with the air through the the opening of the nozzle by a flow of air produced by the electric fan through the suction passage, that sucked dust is collected in a bag or bag for the dust housed in the chamber for the powder and because a surface to be cleaned of in front of the opening, it is brushed by the rotating brush to promote the separation of the dust from the surface, characterized in that the rotor is a hollow cylinder having a through hole passing through a peripheral wall thereof and because a suction fan for sucking the air from the outside of the nozzle to the rotor is attached to the rotor in such a way that the air sucked by the suction fan blows the surface to be cleaned through the through hole.
7. The electric vacuum cleaner according to claim 6, characterized in that the electric vacuum cleaner is of the manual type with the nozzle arranged in a lower part or bottom of the body.
8. 8. An electric vacuum comprising a body having an electric fan and a dust chamber, a nozzle having an opening in its bottom or bottom, a suction passage connecting an interior of the nozzle with the chamber for the powder and a rotating brush including a rotor having bristles on a peripheral surface thereof and provided on the nozzle to rotate about a horizontal axis and in such a way that, in the operation, that dust is sucked with the air through the opening of the nozzle by a flow of air produced by the electric fan through the suction passage, that sucked dust is collected in a bag or bag for dust housed in the dust chamber and because a surface to be cleaned facing the opening, is brushed by the rotating brush to promote the separation of the dust from the surface, characterized in that a reflux passage is provided to guide a stream of water. sliding the electric fan to a vicinity of one end of the rotor and because an air passage is provided to direct the guided slip current, from the electric fan to the peripheral surface of the rotor, along the axis, at the end of the rotor , in such a way that the sliding current of the electric fan blows the surface to be cleaned through the air passage.
9. The electric vacuum cleaner according to claim 8, characterized in that a pulley for receiving a rotational force is attached to the end of the rotor, a through hole is provided in the pulley as the air passage and a fan is provided in the orifice through to send air to the peripheral surface of the rotor.
10. The electric vacuum cleaner according to claim 8, characterized in that a fan for sending air to the peripheral surface of the rotor is attached to one end of the rotor opposite the air passage and because an air intake orifice is provided to the nozzle in a position facing the fan.
11. The electric vacuum cleaner according to claim 8, characterized in that a separable filter is provided for capturing fine dust in the reflux passage.
12. The electric vacuum cleaner according to claim 8, characterized in that part of the reflow passage between the body and the nozzle comprises a flexible hose and an end of the hose can be attached to and detached from the nozzle.
13. 13. The electric vacuum cleaner according to claim 8, characterized in that part of the reflux passage inside the nozzle is formed by dividing the interior of the nozzle with a part of the nozzle casing constituting the nozzle.
14. 14. The electric vacuum cleaner according to claim 8, characterized in that the electric vacuum cleaner is of the manual type with the nozzle that is arranged in a lower part or bottom of the body.
15. 15. The electric vacuum cleaner according to claim 8, characterized in that the rotor is a cylinder having a spiral shoulder on a peripheral surface thereof and the bristles are on the shoulder.