A suction head for attachment to a vacuum cleaner

Abstract: A suction head (4) for attachment to a vacuum cleaner, the suction head including a first portion (5) and a second portion (6), the second portion having a suction port (9) and a bank (11) on the periphery of the suction port, and a woven cloth (12) disposed on the bank, the woven cloth having cut piles which constitute a brush.

Description: BACKGROUND OF THE INVENTION 1. Field of the invention: The present invention relates generally to a vacuum cleaner, and more particularly to a suction head for attachment to the vacuum cleaner, the suction head being applicable not only to hard objects such as wooden floors but also to soft objects such as carpets. 2. Description of the Prior Art There are various types of known suction heads attached to vacuum cleaners wherein the suction heads are provided with a shifter such as a pedal for directing the suction nozzle to either a hard object or a soft object as desired. A typical example disclosed in Japanese Laid-open Patent Publication (Kokai) No. 55-10967 will be explained by reference to Figure 20. When the cleaner is applied to a hard object such as a wooden floor, the brush 1a is projected beyond a suction head 2a by means of a pedal. In this way the suction head 2a is raised above the floor surface by raising the brush 1a and roller 3a . The distance between the floor surface and the suction port of the suction head 2a is roughly 1.0 mm. This small gap protects the floor surface against becoming scratched by fine dirt such as sand trapped in the bristles. Figure 21 shows another example in which a suction head 4a is provided with bristles 5a planted along the suction port. The bristles 5a are made of nylon threads each having a diameter of about 0.15 mm. This type of vacuum cleaner is adapted for cleaning a hard object such as wooden floor and mat (especially Japanese "tatami" mats, which are made of fragile straw and rush). In cleaning "tatami", special care should be paid not to scratch it. When the Japanese mat ("tatami") is cleaned, the problem is that the woven straws and rush are liable to break by friction with the bristles of the brush. The known cleaners mentioned above have a disadvantage that the bristles of the brushes scratches the wooden floor panels, sometimes damaging them seriously. Especially the waxed floor panels are spoiled with scratches. In addition, the scratchy touch on the floor or carpet is unpleasant for the sweeper, and the roller causes noise. In the case of the Japanese "tatami" mats, the damage becomes more serious. Another suction head for attachment to a vacuum cleaner is known from DE-A-3 025 977 and comprises a first portion and a second portion having a suction port including a bank and a woven cloth, said woven cloth being disposed on the bank. This woven cloth is covered by a foam material and, hence, does not show cut piles constituting a brush upright on the bank. This preknown suction head has the disadvantage that the brushes of such a vacuum cleaner scratch wooden floor panels, sometimes damaging them seriously. Waxed floor panels are damaged especially with scratches. In addition, the scratching of the floor or carpet is unpleasant for the user, and a roller causes noise. In order to solve the problems resulting from the bristles of the brushes, soft brushes of fine threads have been proposed. The soft brushes have solved some of the problems but a new problem has arisen. Soft brushes are so pliable that they admit fine particles like food scraps to stay therein without entering the dust back of the cleaner. These fine particles including dirt and food scraps become a breeding ground for germs and ticks. This is unsanitary. SUMMARY OF THE INVENTION Therefore, it is an object of the invention to solve the problems resulting from the brushes. To avoid these problems the suction head according to the invention comprises a woven cloth which has a plurality of cut piles bundled at their root portions and constituing a brush disposed upright on said bank on the forward and the backward side of said suction port; said woven cloth on said forward side of said suction port is formed parallel to the lateral axis of said second portion with respect to the direction in which the suction head is normally used and comprises a plurality of portions spaced by a first air passage; a second air passage extending perpendicular to the lateral axis of said woven cloth on each side of said suction port is formed between each woven cloth on the forward side and the backward side of said suction port; and a group of said plurality of cut piles is formed in a row with constant pitches and is arranged with smaller pitches in a direction perpendicular to the second air passage than in the direction parallel to the second air passage, thereby producing air passages between adjacent bundled root portions of the piles. In a preferred embodiment, the bundled root portions of the cut piles are tilted in the same direction with respect to the lengthened width of the second portion of the suction head. In another preferred embodiment the suction head further comprises means for supporting the woven cloth, and the woven cloth comprises a first use woven cloth and a second use woven cloth disposed in a replaceable manner. In a further embodiment, the supporting means is a polygonal bar, and the first use woven cloth is disposed on one side of the polygonal bar, and the second use woven cloth is disposed on the other sides thereof. In a preferred embodiment, the woven cloth is treated with moth proofing and is sterilized. In another embodiment, the suction head further comprises a cloth member woven with weft and warp both treated with a moth proofing and a sterilizing agent. Thus, the invention described herein makes possible the objectives of (1) providing a suction head for attachment for a vacuum cleaner, the suction head capable of cleaning not only hard objects but also soft objects without scratching them or causing unpleasant noise or scratchy touch, and (2) providing a suction head having the possibility of providing no breeding ground for germs and ticks in the brush by securing the smooth passage of air therethrough. BRIEF DESCRIPTION OF THE DRAWINGS The present invention may be better understood and it numerous objects and advantages will become apparent to those skilled in the art by reference to the accompanying drawings as follows: Figure 1 is a perspective entire view showing a vacuum cleaner according to the present invention; Figure 2 is a cross-sectional view through the suction head of the vacuum cleaner of Figure 1; Figure 3 is a perspective bottom view showing the suction head shown in Figure 1; Figure 4 is a rear view showing the suction head of Figure 3; Figure 5 is a cross-sectional view through the suction head of a modified version of the vacuum cleaner according to the present invention; Figure 6 is a perspective bottom view showing the suction head shown in Figure 5; Figure 7 is a fragmentary cross-sectional view showing the cut piles of the woven cloth shown in Figure 5; Figure 8 is a cross-sectional view through the brush of Figure 7; Figure 9 is a cross-sectional view through the suction head of another modified version of the vacuum cleaner according to the present invention; Figure 10 is a perspective bottom view showing the suction head shown in Figure 9; Figure 11 is a diagrammatic plan view showing the arrangement of cut piles of the woven cloth shown in Figure 10; Figure 12 is a fragmentary cross-sectional view showing a portion of the brush shown in Figure 10; Figure 13 is a cross-sectional view through the suction head of a further modified version of the vacuum cleaner according to the present invention; Figure 14 is a perspective bottom view showing the suction head shown in Figure 13; Figure 15 is a cross-sectional view taken the suction head of another modified version of the vacuum cleaner according to the present invention; Figure 16 is a cross-sectional view taken along the line Y-Y in Figure 15; Figure 17 is a cross-sectional view through the suction head of another modified version of the vacuum cleaner according to the present invention; Figure 18 is a perspective rear view showing the suction head of Figure 17; Figure 19 is a cross-sectional view through the suction head of a further modified version of the vacuum cleaner according to the present invention; Figure 20 is a cross-sectional view through a known suction head; and Figure 21 is perspective rear view showing a known suction head of another type. DETAILED DESCRIPTION OF THE INVENTION Referring to Figure 1, the vacuum cleaner includes a body 1 , a flexible hose 2 , an extension wand 3 and a suction head 4 . The body 1 contains a dust bag and a power-driven fan. Referring to Figures 2 to 4 the suction head 4 includes an upper halved portion 5 and a lower halved portion 6 detachably joined together. The upper halved portion 5 is jointed to an extension pipe 7 by means of a ring 8 , and the extension pipe 7 is rotatably connected to the body 1 through the extension wand 3 and the flexible hose 2 . The suction head 4 is provided with a suction port 9 formed in the lower halved portion 6 for connection to the extension pipe 7 , the suction port 9 including a groove 10 extending in the left-hand and right-hand directions from the suction port 9 . The groove 10 is surrounded by a bank 11 , and woven cloth 12 is bonded on the bank 11 by adhesive so as to form a brush with its cut piles. For explanatory convenience the brush is divided into brush portions: in the illustrated embodiment, four brush portions are formed. The bank 11 includes a forward side and a backward side with respect to the suction port 9 , that is, in the direction in which the suction head 4 is normally moved. The forward side and the backward side of the bank 11 will be referred to below. The woven cloth 12 has cut piles upright on its surface, each pile having a diameter of about 0.1 mm or less, so that the cut piles are densely upright on the bank 11 . The length of each pile is about 4.0 to 6.0 mm so as to ensure that the suction port 9 is adequately spaced from the floor (or carpet) surface, thereby ensuring that the suction head 4 is smoothly and softly slidable on the floor. The adequate space is required for preventing the suction head 4 from scratching the floor or damaging the carpet. The forward side of the bank 11 is provided with recesses 13 formed between one brush portion and the next: in the illustrated embodiment two suction recesses 13 are provided but the number of them is not limited, depending on the length of the bank 11 . The recesses 13 are intended to suck dirt in front of the suction head 4 , and their depth is appropriately determined with respect to the height of the woven cloth 12 so as to adjust the suction efficiency. As shown in Figure 3 the backward side of the bank 11 is continuous with no breaks so as not to allow any air to leak in the backward direction, thereby ensuring that dirt on the floor (or carpet) is completely sucked into the suction head 4 . The side recesses 14 are provided between the forward side and the backward side of the bank 11 so as to admit air into the suction head 4 at a high velocity through the groove 10 and the port 9 . The suction efficiency can be adjusted by determining the size and the height of the side recesses 14 . The end of each woven cloth 12 is rounded so as to enable air to enter the suction port 9 smoothly. In operation, the extension pipe 7 of the suction head 4 is connected to the extension wand 3 of the body 1 . Owing to the cut piles having lengths of 4.0 to 6.0 mm with respect to the floor (or carpet) surface, fine sand and other hard particles on the floor are advantageously trapped in the cut piles and stay there, thereby preventing them from scratching the floor surfaces or damaging carpets. In addition, owing to the presence of the recesses 13 and the side recesses 14 , dirt out of the width of the suction head 4 is sucked through them, thereby enhancing the cleaning efficiency. When the suction head 4 is applied to Japanese "tatami" mats, which are made out of straw and rush, the pressure imparted thereto by the suction head 4 is weakened by the effect of the cut piles, each of which is flexible so that the suction head 4 can smoothly slide along the "tatami" mats without abrading it. In addition, the tip portion of each bristle is inserted deeply in the fabric of the "tatami" mats so as to pick up deposits of dirt in the gaps between the woven straws. Hard floor surfaces such as wooden floor are polished by the woven cloth 12 while the cleaning is carried out. Referring to Figures 5 to 8, which illustrate a second example of the embodiment, the vacuum cleaner includes a body 1 (omitted) and a suction head 15 which is composed of an upper halved portion 16 and a lower halved portion 17 through an extension pipe 18 . The upper halved portion 16 is detachably coupled to the extension pipe 18 by means of a ring 19 . The suction head 15 is provided with a suction port 20 which communicates with the extension pipe 18 (and with the body 1 ). The suction port 20 includes a groove 21 extending in the left-hand and right-hand directions from the suction port 20 . The groove 21 is surrounded by a bank 22 , and woven cloth 23 is bonded on the bank 22 by adhesive so as to provide a brush portion. As described above, for explanatory convenience the brush is divided into brush portions: the illustrated embodiment has four brush portions. The woven cloth 23 has cut piles having a diameter of about 0.1 mm or less. The woven cloth 23 is bonded on the bank 22 so that the cut piles are densely upright thereon. The length of each pile is not smaller than 4. 0 mm so as to ensure the the suction port 20 is adequately spaced from the floor (or carpet) surface, thereby ensuring that the suction head 15 is smoothly and softly slidable along the floor. The adequate space is required for preventing the suction head 15 from scratching the floor or damaging the carpet. The bank 22 include a forward side and a backward side with respect to the suction port 20 , that is, in the direction in which the suction head 11 is normally moved. Brush portions 23 disposed on the forward side of the bank 22 are spaced by passages 24 . The backward side of the bank 22 is provided with a one-piece brush portion 23 with no break of a passage. There are provided side passages 27 between the brush portions on the forward side and the backward side of the bank 22 . The difference between the recesses 13 and 14 in the first-mentioned example and the passages 24 and 27 in the second-mentioned example is that the passages 24 and 27 are produced on the flat surface of the bank 22 . The length of the cut piles of the cloth 23 is appropriately adjusted with respect to the passages 24 and 27 , thereby enhancing the dust sucking efficiency. Excessively dense cut piles allow dirt to stay therein, thereby reducing the sucking efficiency. To solve this problem, the root portions 25 of the cut piles are arranged with larger pitches in a direction (A) perpendicular to the air inducing direction than with those in the air inducing direction. This is clearly shown in Figure 8. The reference numeral 26 denotes gaps between the adjacent root portions 25 . The gaps 26 allow a relatively strong gust of air to pass so as to blow away dirt deposits in the cut piles. As described above with respect to the first-mentioned example, the width and height of the side passages 27 are adjusted to vary the dirt sucking efficiency. The end of each brush portion 23 is rounded to enable air to enter the suction port 21 smoothly. This example is operated in the same manner as the first-mentioned example. Owing to the spaced root portions 25 of the cut piles arranged perpendicularly to the air inducing direction, a relatively strong gust of air is passed through the gaps 26 whereby the dirt deposits in the cut piles are separated therefrom and induced into the suction port 20 . As a result, the cut piles are kept clear and sanitary. Referring to Figure 9 to 12, a third example of the embodiment will be described: The illustrated vacuum cleaner includes a body 1 (omitted) and a suction head 28 which includes an upper halved portion 29 and a lower halved portion 30 . The suction head 28 is connected to the body 1 (omitted) through a connection pipe 31 which is rotatably coupled to the upper halved portion 29 by means of a ring 32 . The suction head 4 is provided with a suction port 33 formed in the lower halved portion 30 for connection to the extension pipe 31 . The suction port 9 includes a groove 34 extending in the left-hand and right-hand directions therefrom. The groove 34 is surrounded by a bank 35 , and woven cloth 36 is bonded on the bank 35 by adhesion so as to provide a brush portion. For explanatory convenience the brush is divided into brush portions: in the illustrated embodiment, four brush portions are formed. The bank 35 includes a forward side and a backward side in the direction in which the suction head 28 is normally moved. As described above, the bank 35 include the forward side and the backward side The woven cloth 36 has cut piles having a diameter of about 0.1 mm or less. The length of each pile is not smaller than 4.0 mm so as to ensure that the suction port 33 is adequately spaced from the floor (or carpet) surface, thereby ensuring that the suction head 28 is smoothly and softly slidable along the floor. The adequate space is required for preventing the suction head 28 from scratching the floor or damaging the carpet. The cut piles 36 are bundled at their root portions 38 , which, as shown in Figure 11, are tilted at an angle ϑ to the lengthwise width (C) of the lower halved portion 30 of the suction head 28 . In addition, root portions 38 are aligned at distances (S) in the direction (D) in which air is sucked into the suction head 28 , wherein the distance (S) is set sufficiently large to prevent the top portions of the cut piles 36 from overlapping each other when they are bent against the floor (or carpet). Figure 12 shows that the top portions of the cut piles 36 are kept safe from overlapping each other. The brush portion on the backward side of the bank 35 is straight extending along it so as to block the air escaping backward from the groove 34 . If the escaping occurs in the direction in which air is sucked, the sucking efficiency decreases. There are provided side passages 39 between the brush portions on the backward side and the forward side of the bank 35 . The brush portions on the forward side of the bank 35 are spaced by passages 37 . The length of the cut piles are appropriately adjusted with respect to the passages 39 and 37 , thereby enhancing the dust sucking efficiency. The end of each brush portion is rounded so as to secure a smooth flow entering the groove 34 . Owing to the declined cut piles 36 to the direction (C) the top portions of the cut piles 36 are prevented from overlapping each other. Referring to Figures 13 to 14, a fourth example of the embodiment will be described: The illustrated vacuum cleaner includes a body 1 (omitted) and a suction head 40 which includes an upper halved portion 41 and a lower halved portion 42 . The suction head 40 is connected to the body 1 through a connection pipe 43 which is rotatably coupled to the upper halved portion 41 by means of a ring 44 . The suction head 40 is provided with a suction port 45 formed in the lower halved portion 42 for connection to the connection pipe 43 . The suction port 45 includes groove 46 extending in the left-hand and right-hand directions therefrom. The groove 46 is surrounded by a frame-like seat 48 constituting a bank 47 , which is joined to the lower halved portion 42 by means of screws 49 . Initial use woven cloth 50 is bonded on the bank 47 by adhesive so as to provide an initial use brush portion. A second use woven cloth 51 is bonded on another side of the bank 47 . The woven cloth 50 and 51 provide brush portions, which are also divided into four portions. The bank 47 includes a forward side and a backward side in the direction in which the suction head 40 is normally moved on the floor (or carpet). As described above, the bank 47 include the forward side and the backward side. The woven cloth 50 and 51 have cut piles having a diameter of about 0.1 mm or less, so that they are densely upright on the bank 47 . The length of each pile is not smaller than 4.0 mm so as to ensure that the suction port 45 is adequately spaced from the floor (or carpet) surface, thereby ensuring that the suction head 40 is smoothly and softly slidable along the floor. The adequate space is required for preventing the suction head 40 from scratching the floor or damaging the carpet. The brush portions formed by the woven cloth 50 and 51 on the forward side of the bank 47 are spaced by passages 52 . The size of the passages 52 is appropriately adjusted with respect to the height of the cut piles of woven cloth 50 and 51 so as to secure an optimum sucking efficiency. The brush portions formed by the woven cloth 50 and 51 on the backward side of the bank 47 extend along it with no break. The reference numeral 53 denotes side passages between the brush portions on the forward side and the backward side of the bank 47 . The brush portion on the backward side of the bank 47 is straight extending along it so as to block the air escaping backward from the side passages 53 . If any air escapes in the direction in which air is sucked, the sucking efficiency decreases. Side passages 53 are provided between the brush portions on the backward side and the forward side of the bank 47 . The end of each brush portion is rounded so as to secure a smooth flow entering the groove 46 . In effecting the changeover between the woven cloth 50 and 51 , the screws 49 are unfastened and and the seat 48 is reversed and fastened to the lower halved portion of the suction head 42 . Referring to Figures 15 and 16, a fifth example of the embodiment will be described: The illustrated vacuum cleaner includes a body 1 (omitted) and a suction head 55 which includes an upper halved portion 56 and a lower halved portion 57 . The suction head 40 is connected to the body 1 through a connection pipe 58 which is rotatably coupled to the upper halved portion 56 by means of a ring 59 . The suction head 55 is provided with a suction port 60 formed in the lower halved portion 57 for connection to the connection pipe 58 . The suction port 60 includes groove 61 extending in the left-hand and right-hand directions therefrom. The groove 61 is surrounded by a pair of polygonal seats 63 constituting a bank 62 on a forward side and a backward side of the lower halved portion 57 in the direction in which the suction head 55 is normally moved on the floor (or carpet). The polygonal seat 63 is secured to each side of the lower halved portion 57 by engaging projections 64 of ledges 66 of the lower halved portion 57 with recesses 65 of the polygonal seat 63 . The ledges 66 are flexible so as to facilitate the engagement and disengagement of the projections 64 with the recesses 65 . Initial use woven cloth 67 is bonded on one of the sides of the bank 47 by adhesive so as to provide an initial use brush as a whole. Second use woven cloth 68 is bonded on the other three sides of the bank 62 by adhesive. The woven cloth 67 and 68 have cut piles having a diameter of 0.1 mm or less. As described above, the bank 47 include the forward side and the backward side. The cut piles are densely upright on the bank 47 through the respective cloth. The length of each pile is not smaller than 4.0 mm so as to ensure the suction port 45 is adequately spaced from the floor (or carpet) surface, thereby ensuring that the suction head 28 is smoothly and softly slidable along the floor. The adequate space is required for preventing the suction head 40 from damaging the floor or the carpet. The initial use woven cloth 67 has cut piles each having a diameter of not larger than 0.1 mm and a length of not smaller than 4.0 mm so as not to lose soft touch on the cleaning object. The cut piles are upright on the bank 47 through the cloth 67 . In operation, the initial use woven cloth 67 is initially used but because of their fine structure they wear out in a relatively short period of time. To replace a fresh brush portion the projections 64 are disengaged from the recesses 65 by pulling the ledges 66 in the direction of arrow (E) and the polygonal seat 63 is rotated at 90° so that a fresh brush portion comes out in the lower halved portion 57 . The polygonal seat 63 is again secured to the lower halved portion 57 by returning the ledges into the recesses 65 in the opposite direction to the direction (E). In this way the second use woven cloth 68 is used in turn until all of them wear out. When the number of the polygonal sides are increased, the total life of the brush is prolonged; that is, it is multiplied by the number of the polygonal sides. In the illustrated embodiment the life of the brush will be multiplied by 4. Referring to Figures 17 to 19, a sixth and a seventh example of the embodiment will be described: The illustrated vacuum cleaner includes a body 1 (omitted) and a suction head 69 which includes an upper halved portion 70 and a lower halved portion 71 . The suction head 40 is connected to the body 1 through a connection pipe 72 which is rotatably coupled to the upper halved portion 56 by means of a ring 73 . The suction head 55 is provided with a suction port 74 formed in the lower halved portion 71 for connection to the connection pipe 72 . The suction port 60 includes groove 75 extending in the left-hand and right-hand directions therefrom. The groove 75 is surrounded by a bank 76 , and woven cloth 77 is bonded on the bank 76 by adhesive so as to provide a brush as a whole. The woven cloth 77 has cut piles having a diameter of about 0.1 mm or less, so that the cut piles can densely upright on the bank 76 . The napping cloth is a cloth woven with warp and weft. The length of each pile is not smaller than 4.0 mm so as to ensure the the suction port 60 is adequately spaced from the floor (or carpet) surface, thereby ensuring that the suction head 69 is smoothly and softly slidable along the floor. The adequate space is required for preventing the suction head 69 from scratching the floor or damaging the carpet. As shown in Figure 19, the napping cloth 77 is treated with moth proofing and/or sterilizing treatment. To achieve these treatments, the base cloth is made by weaving weft 78 and warp 79 , both of which have an affinity with a moth proofing agent and a sterilizing agent, and these threads are lined with a back-up material 80 of adhesive. The brush portions on the forward side of the bank 76 are spaced by passages 81 which enable air to enter the suction head 69 . The size of the passages 81 is adjusted with respect to the height of the the cut piles of the woven cloth 77 so as to adjust the suction efficiency. The backward side of the bank 76 is continuous with no breaks so as not to allow any air to leak in the backward direction, thereby ensuring that dirt on the floor (or carpet) is completely sucked into the suction head 69 . There are provided side passages 82 between brush portions on the forward side and the backward side of the bank 76 so as to admit air into the suction head 69 at a high velocity through the groove 10 and the suction port 9 . The suction efficiency can be adjusted by determining the size and the height of the side passages 82 . The end of each brush portion 77 is rounded so as to enable air to enter the suction port 75 smoothly.

Claims: A suction head (4, 15, 28, 40, 55, 69) for attachment to a vacuum cleaner comprising a first portion (5, 16, 29, 41, 56, 70) joined to an extension pipe (7, 18, 31, 43, 58, 72) by means of a ring (8, 19, 32, 44, 59, 73), a second portion (6, 17, 30, 42, 57, 71) having a suction port (9, 20, 33, 45, 60, 74) including a bank (11, 22, 35, 47, 62, 76), said bank (11, 22, 35, 47, 62, 76) being formed parallel to a lateral axis of the second portion (6, 17, 30, 42, 57, 71) on a forward side and a backward side of said suction port (9, 20, 33, 45, 60, 74) with respect to the direction in which the suction head (4, 15, 28, 40, 55, 69) is normally used, and a woven cloth (12, 23, 36, 50, 51, 67, 68, 77), characterized in that said woven cloth (12, 23, 36, 50, 51, 67, 68, 77) has a plurality of cut piles bundled at their root portions and constituting a brush disposed upright on said bank (11, 22, 35, 47, 62, 76) on the forward and backward side of said suction port (9, 20, 33, 45, 60, 74), that said woven cloth (12, 23, 36, 50, 51, 67, 68, 77) on said forward side of said suction port (9, 20, 33, 45, 60, 74) is formed parallel to the lateral axis of said second portion with respect to the direction in which the suction head (4, 15, 28, 40, 55, 69) is normally used and comprises a plurality of portions spaced by a first air passage, that a second air passage extending perpendicular to the lateral axis of said woven cloth (12, 23, 36, 50, 51, 67, 68, 77) on each side of said suction port (9, 20, 33, 45, 60, 74) is formed between each woven cloth (12, 23, 36, 50, 51, 67, 68, 77) on the forward side and the backward side of said suction port (9, 20, 33, 45, 60, 74), and that a group of said plurality of cut piles is formed in a row with constant pitches and is arranged with smaller pitches in a direction perpendicular to the second air passage than in the direction parallel to the second air passage, thereby producing air passages between adjacent bundled root portions of the piles. A suction head according to claim 1, wherein the bundled root portions of said cut piles are tilted on the bank (11, 22, 35, 47, 62, 76) in the same direction with respect to the lengthened width of the second portion of the suction head (4, 15, 28, 40, 55, 69). A suction head according to claim 1 or 2, further comprising means for supporting the woven cloth (12, 23, 36, 50, 51, 67, 68, 77), which comprises a first use woven cloth and a second use woven cloth disposed in a replaceable manner. A suction head according to claim 3, wherein the supporting means is a polygonal bar, and wherein the first use woven cloth is disposed on one side of the polygonal bar, and the second use woven cloth is disposed on the other sides thereof. A suction head according to claims 1 to 4, wherein the woven cloth (12, 23, 36, 50, 51, 67, 68, 77) is treated with moth proofing and is sterilized. A suction head according to claim 1 to 5, further comprising a cloth member woven with weft and warp, both treated with a moth proofing and a sterilizing agent.

Inventors: ISHI MITSUO, MURATA YOSHITAKA, ISHI, MITSUO, MURATA, YOSHITAKA
Applicants: MATSUSHITA ELECTRIC IND CO LTD, MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Application year: 1990
Main classification: A47L9
IPC codes: A47L9