Source: http://www.google.com/patents/US6994621?ie=ISO-8859-1
Timestamp: 2014-04-16 16:58:24
Document Index: 557525631

Matched Legal Cases: ['art 61', 'art 61', 'art 61', 'art 61', 'art 61', 'art 61']

Patent US6994621 - Ventilation member, vented housing using the same, pull-out prevention ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA ventilation member having: a breathable film transmitting gas passing through an opening portion of a housing in a state in which the breathable film is fixed to the opening portion; and a support including a supporting portion for supporting the breathable film and an insertion portion to be inserted...http://www.google.com/patents/US6994621?utm_source=gb-gplus-sharePatent US6994621 - Ventilation member, vented housing using the same, pull-out prevention member for ventilation member and kit for forming ventilation structureAdvanced Patent SearchPublication numberUS6994621 B2Publication typeGrantApplication numberUS 10/437,972Publication dateFeb 7, 2006Filing dateMay 15, 2003Priority dateMay 15, 2002Fee statusPaidAlso published asCN1286684C, CN1461712A, DE60336096D1, EP1363069A2, EP1363069A3, EP1363069B1, EP1930654A2, EP1930654A3, EP1930654B1, US20030220067Publication number10437972, 437972, US 6994621 B2, US 6994621B2, US-B2-6994621, US6994621 B2, US6994621B2InventorsHiroaki Mashiko, Toshiki Yanagi, Hiroyuki Nishii, Yoshiki IkeyamaOriginal AssigneeNitto Denko CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (9), Referenced by (4), Classifications (25), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetVentilation member, vented housing using the same, pull-out prevention member for ventilation member and kit for forming ventilation structureUS 6994621 B2Abstract A ventilation member having: a breathable film transmitting gas passing through an opening portion of a housing in a state in which the breathable film is fixed to the opening portion; and a support including a supporting portion for supporting the breathable film and an insertion portion to be inserted into the opening portion of the housing; wherein the insertion portion has a lock portion in an insertion-start-side end portion thereof, the lock portion having a tapered forward end, while the insertion portion is divided into a plurality of parts circumferentially at least on an insertion start side thereof.
wherein said insertion portion is divided into a plurality of parts circumferentially at least on an insertion start side thereof;
a reinforcement material bonded to said breathable film, so that said reinforcement material and said breathable film form a laminate; and
wherein an air permeability of said laminate is in a range of 0.1�300 sec/100 cm3 and said laminate has a water resistant pressure of not less than 1.0 kPa.
2. A ventilation member according to claim 1, wherein a through hole is formed in said support, and said breathable film is fixed to said supporting portion so as to cover said through hole.
3. A ventilation member according to claim 1, said insertion portion includes a plurality of leg portions at least on the insertion start side, and at least one of said leg portions is provided with a lock portion on the insertion start side thereof.
4. A ventilation member according to claim 3, wherein said leg portions include at least one leg portion which is not provided with said lock portion.
5. A ventilation member according to claim 3, wherein said support has a ring shape, a minimum ring width of said ring shape is larger than a distance defined between a pair of said leg portions at an end of the insertion start side of said insertion portion.
6. A ventilation member according to claim 1, wherein a plurality of through holes are formed in a surface of said support covered with said breathable film.
7. A ventilation member according to claim 1, wherein said support includes a seal portion on a surface of said supporting portion facing said housing.
8. A ventilation member according to claim 1, wherein said support includes a protective portion covering at least a part of said breathable film from above of said breathable film.
9. A ventilation member according to claim 1, wherein said breathable film includes a PTFE porous material.
10. A ventilation member according to claim 1, wherein said breathable film is subjected to liquid-repellent treatment.
11. A vented housing comprising a ventilation member according to claim 1, which is fixed to said opening portion of said housing.
12. A ventilation member according to claim 1, wherein said reinforcement material is bonded to at least one side of said breathable film.
The present application is based on Japanese Patent Applications Nos. 2002-140628 and 2003-43209, the entire contents of which are incorporated herein by reference.
FIGS. 17A and 17B show an example of a related-art ventilation member. A ventilation member 51 shown in each of FIGS. 17A and 17B is used for an equipment housing to be exposed to contaminants such as rain, muddy water or oils, for example, for automobile electric components. The ventilation member 51 has an L-shaped or U-shaped (not shown) tubular body. The ventilation member 51 may have a structure having a maze 52 internally. One end of the ventilation member 51 is outer-fitted to a neck portion 50 a provided in a housing 50 so that the ventilation member 51 is fixed to the housing.
FIGS. 18A and 18B show another example of a related-art ventilation member. In a ventilation member 60 shown in FIGS. 18A and 18B, a substantially cylindrical body 62 is fitted to the inside of a cover part 61 so as to form a ventilation path between the inner circumference of the cover part 61 and the outer circumference of the substantially cylindrical body 62 and between the bottom surface of the cover part 61 and the bottom portion of the substantially cylindrical body 62. When an opening in the bottom portion of the substantially cylindrical body 62 is covered with a filter 63, the ventilation member 60 can also exert a higher water-proofing property and a higher dust-proofing property (disclosed in Japanese Patent Publication No. JP-A-2001-143524). An opening 62 a in the top portion of the substantially cylindrical body 62 is outer-fitted to the neck portion 50 a of the housing 50 so that the ventilation member 60 is fixed to the housing.
FIG. 19 shows another example of a related-art ventilation member. In a ventilation member 70 shown in FIG. 19, a tapered insertion portion 71 a is formed in one end portion of a disc-like elastomer member 71, while a splash guard cover 71 b is formed on the other end portion of the disc-like elastomer member 71, and a breathable film 72 is fixed by fusion bonding on the way of a ventilation flow path penetrating between the one end portion and the outer circumference of the other end portion. In addition, a sealing/fixing portion 71 c for fixedly retaining a housing 7 in cooperation with the insertion portion 71 a is formed in the outer circumference of the elastomer member 71 (disclosed in Japanese Patent Publication No. JP-A-H10-85536). The insertion portion 71 a is pressed into the opening portion of the housing so that the ventilation member 70 is fixed to the housing.
Each of the ventilation members 51 and 60 shown in FIGS. 17A, 17B, 18A and 18B is fixed to the housing 50 only by outer fitting to the neck portion 50 a of the housing 50. Therefore, there is a possibility that the ventilation member may be pulled out of the housing.
On the other hand, in the ventilation member 70 shown in FIG. 19, the surface abutting against the housing 7 is made of elastomer. Therefore, when oil invades a part of the surface of the ventilation member 70 abutting against the housing 7, it becomes easy to detach the ventilation member 70 from the housing. It cannot be therefore said that the ventilation member 70 is suitable as a ventilation member for a housing used in an environment easy for oil to adhere to the ventilation member.
SUMMARY OF THE INVENTION According to the invention, there is provided a ventilation member having: a breathable film transmitting gas passing through an opening portion of a housing in a state in which the breathable film is fixed to the opening portion; and a support including a supporting portion for supporting the breathable film and an insertion portion to be inserted into the opening portion of the housing; wherein the insertion portion has a lock portion in an insertion-start-side end portion thereof, the lock portion having a tapered forward end, while the insertion portion is divided into a plurality of parts circumferentially at least on an insertion start side thereof.
The ventilation housing of the invention is characterized in that the ventilation member is fixed to the opening portion of the housing.
According to the invention, there is provided a pull-out prevention member for ventilation member which is served along with the ventilation member of the invention, characterized in that: the pull-out prevention member includes a columnar portion which is inserted into the insertion portion inserted into the opening portion so as to penetrate the opening portion, so that the insertion portion is spread from the inside thereof, and on the columnar portion, there is formed an air hole communicating with the through hole of the ventilation member when the pull-out prevention member is inserted into the insertion portion.
According to the invention, there is provided a kit for forming a ventilation structure comprising the ventilation member of the invention and the pull-out prevention member for ventilation member of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view showing an embodiment of a ventilation member according to the invention;
FIG. 2A is a bottom view of the ventilation member shown in FIG. 1, and FIG. 2B is a sectional view taken on line A�A′ in FIG. 2A;
FIG. 3 is a sectional view showing another embodiment of a ventilation member according to the invention;
FIGS. 4A and 4B are views showing a state where one of the leg portions 2 h of one ventilation member is inserted into the through hole 3 of the other ventilation member;
FIG. 5 is a sectional view showing another embodiment of a ventilation member according to the invention;
FIG. 6A is an exploded view showing another embodiment of a ventilation member according to the invention, and FIG. 6B is a sectional view of the ventilation member shown in FIG. 6A;
FIG. 7 is a sectional view showing another embodiment of a ventilation member according to the invention;
FIG. 8A is a front view of the ventilation member shown in FIG. 7, and FIG. 8B is a view in which the seal portion is omitted from the bottom view of the ventilation member shown in FIG. 8A;
FIG. 9A is a front view of another embodiment of the ventilation member of the invention, and FIG. 8B is a view in which the seal portion is omitted from the bottom view of the ventilation member shown in FIG. 9A;
FIG. 10 is a front view showing a state in which the pull-out prevention member is mounted on the ventilation member shown in FIG. 9;
FIG. 11 is a sectional view showing the pull-out prevention member shown in FIG. 10;
FIG. 12A is a perspective view of a connector to which a ventilation member according to the invention has been fixed, and FIG. 12B is a sectional view taken on line B�B′ in FIG. 12A;
FIG. 13A is a perspective view of an automobile lamp to which a ventilation member according to the invention has been fixed, and FIG. 13B is a sectional view taken on line C�C′ in FIG. 13A;
FIG. 14 is a partially sectional view of an electric toothbrush to which a ventilation member according to the invention has been fixed;
FIG. 15A is a perspective view of an ECU to which a ventilation member according to the invention has been fixed, and FIG. 15B is a back view of a top cover of an ECU cover;
FIG. 16A is a front view of the ventilation member of Comparative Example 3, and FIG. 16B is a view in which the seal portion is omitted from the bottom view of the ventilation member shown in FIG. 16A;
FIGS. 17A and 17B are sectional views showing an example of a related-art ventilation member;
FIG. 18A is an exploded view for explaining another example of a related-art ventilation member, and FIG. 18B is a sectional view of the ventilation member shown in FIG. 18A; and
FIG. 19 is a sectional view for explaining another example of a related-art ventilation member.
Description will be made on an embodiment of a ventilation member according to the invention with reference to FIGS. 1 through 6B.
A ventilation member 1 shown in FIGS. 1, 2A and 2B includes a support 2 and a breathable film 4. The support 2 includes a supporting portion 2 a for supporting the breathable film 4, and an insertion portion 2 b formed on one side of the supporting portion 2 a. Through holes 3 penetrating the supporting portion 2 a and the insertion portion 2 b are formed in a central portion of the support 2. The breathable film 4 is fixedly attached to the supporting portion 2 a so as to cover the through holes 3.
The insertion portion 2 b has a columnar shape whose diameter is substantially the same as that of an opening portion 8 of a housing 7. At least the insertion start side of the insertion portion 2 b is divided into a plurality of parts circumferentially. The insertion portion 2 b includes at least a plurality of leg portions 2 h provided on the insertion start side so as to form a slit 2 i between the adjacent leg portions 2 h. Each of the leg portions 2 h includes a lock portion 2 c whose outer peripheral face is tapered at an end on the insertion start side.
When the ventilation member 1 is fixed to the opening portion 8 of the housing 7, the lock portions 2 c are pressed onto the opening portion 8 by inserting the insertion portion 2 b into the opening portion, so that the divided parts of the insertion portion 2 b (leg portion 2 h) are bent inward. Thus, the insertion pressure of the ventilation member 1 against the housing 7 is reduced. When the lock portions 2 c pass through the opening portion 8 and is released from the pressure, the lock portions 2 c are locked on the inner surface of the housing. Thus, the ventilation member 1 is fixed to the housing 7. Once the ventilation member 1 is fixed to the housing 7, the ventilation member 1 cannot be took off from the outside of the housing 7 unless the ventilation member 1 is pulled out with force great enough to break the ventilation member 1 and/or the housing 7. Thus, the possibility that the ventilation member 1 is detached from the housing 7 is reduced.
In the embodiment shown in FIGS. 1, 2A and 2B, the insertion start side of the insertion portion 2 b is divided into three circumferentially. The number of divided parts is not limited thereto, but may be two or four, or more. In addition, in the embodiment shown in FIGS. 1, 2A and 2B, a longitudinal part of the insertion portion 2 b is divided into a plurality of parts. The invention is not limited thereto, but the whole of the insertion portion 2 b may be divided longitudinally into a plurality of parts. Although all the leg portions 2 h include the lock portion 2 c in this embodiment, the lock portions may be provided on at least one, preferably two or more leg portions 2 h. It is preferable to form the lock portions 2 c more than 0.1 mm apart from the tip end of the insertion portion 2 b on the insertion start side. If a flat portion is formed at the end of the insertion start side, the insertion portion 2 b can be easily inserted in the opening portion 8 of the housing.
In addition, the surface of the supporting portion 2 a abutting against the breathable film 4 is formed into a curved surface as shown in FIG. 2B. In such a manner, the ventilation member in which the curved surface having a circumferential edge portion lower in height than a central portion at a surface of the supporting portion 2 a is provided, the property of water drainage is improved suitably as a property of a ventilation member for a housing for use in an environment easy to be affected by water. Incidentally, in place of the curved surface of the supporting portion 2 a as described above, for example, the shape of the supporting portion 2 a maybe formed into a conical shape. In this case, the breathable film 4 is fixedly attached to the slope of the conical shape so that the property of water drainage can be improved.
The dimensions of the through holes 3 may be determined appropriately in consideration of the kind of housing to which the ventilation member 1 is fixed and the permeability of the breathable film 4. The area of the through holes 3 (area on a plane perpendicular to the gas permeable direction) may be set to be 0.001�100 cm2.
In addition, a plurality of through holes 3 are provided in the surface covered with the breathable film 4 as shown in FIG. 2B. When a plurality of through holes 3 are formed in the surface covered with the breathable film 4 in such a manner, the center of the breathable film 4 is also supported by the supporting portion 2 a. It is therefore possible to suppress the damage of the breathable film 4 from external force.
As shown in FIG. 3, a single through hole 3 may be formed on the face that is to be covered with the breathable film 4. If the diameter of the through hole 3 is large, air permeability is enhanced. Further, if the diameter is sufficiently large, and is constant in a longitudinal direction of the through hole 3, the moisture condensation which would inhibit air breathing is prevented on the wall of the supporting member 2 surrounding the through hole. However, if the through hole is large, it is a fear that the leg portions 2 h of the ventilation members would break the breathable films 4 when the plurality of the ventilation members are packed in a single pack and transported or delivered.
FIGS. 4A and 4B show the leg portion 2 h of the ventilation member x is inserted in the through hole 3 of the other ventilation member Y. FIGS. 4A and 4B are plan views as viewed in a direction in which air passes through. The ventilation member X is viewed from a side of the supporting portion 2 a, and the ventilation member Y is viewed from a side of the insertion portion 2 b, respectively. The breathable film of the ventilation member X is omitted in the figures. The support (corresponding to the supporting portion 2 a in FIGS. 4A and 4B) shows a ring shape in a plan view in the direction in which the air passes through.
As shown in FIG. 4A, if a dimension A is smaller than a dimension B, the leg portion 2 h of the ventilation member X can be deeply inserted into the through hole 3 of the ventilation member Y so that the breathable film of the ventilation member Y is broken. The dimension A is defined as the minimum value of the ring width (minimum ring width) and the dimension B is defined as the closest distance between two of the adjacent leg portions in which the closest distance therebetween is the largest than any other pairs of adjacent leg portions (maximum distance between the leg portions) at the ends of the insertion start side of the insertion portions 2 b. As shown in the plan view of FIG. 4A in the direction in which the air passes through, if the outer shape of the supporting portion 2 a and the through hole 3 are true circles and the circles are concentric, the ring width at any portion is constant. Therefore this value is determined to the dimension A. Further, as shown in FIG. 4A, the leg portions 2 h have the same shape and are disposed at a constant interval, the closest distance between any two adjacent leg portions among the leg portions 2 h at the ends of the insertion start side of the insertion portions 2 b is the same, therefore, this value is determined to be the dimension B.
As shown in FIG. 4B, when the dimension A is provided to be larger than the dimension B, even if the leg portions 2 h of the ventilation member X come to enter deeply into the through hole 3 of the ventilation member Y, the supporting portion 2 a of the ventilation member X abuts with the leg portions 2 h of the ventilation member Y so that the leg portions 2 h of the ventilation member X are prevented from being inserted into the through hole 3 of the ventilation member Y. Accordingly, breakage of the breathable films 4 of the other ventilation members by the leg portions 2 h and interlacement of the leg portions 2 h with those of the other ventilation members are prevented. Handling of the ventilation members are easily performed.
Thermo plastic resin easy to mold is preferably used as the material of the support 2 without any particular limitation. Examples of such a material to be used include thermoplastic resins other than elastomers, such as polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polysulfone (PS), polypropylene (PP), polyethylene (PE), ABS resin, or composite materials of these thermoplastic resins. Other than the thermoplastic resins, composite materials in which reinforcement materials such as glass fibers or carbon fibers, or metal is compounded with thermoplastic resin so as to improve the heat resistance, the moisture resistance, the dimensional stability and the rigidity may be used. In addition, the ventilation member 1 is fixed to the housing by press fitting. It is therefore preferable to use a material superior in impact resistance and high in bending strength, such as PBT, PPS or PS. Particularly, when PBT is used, it is preferable that 5 to 40 wt % of the glass fibers are contained in the material. Further, treatments for obtaining desired characteristics such as mold release, adhesiveness improvement, electrical insulation, semiconductivity, conductivity or the like may be performed on the surface of the support 2 which is formed with the above-mentioned materials.
The method for forming the support 2 is not limited particularly. For example, the support 2 may be formed by injection molding, compression molding or cutting.
The material, structure and form of the breathable film 4 are not limited particularly if sufficient permeability can be secured. It is, however, preferable to select at least one kind from fluororesin porous materials and polyolefin porous materials. Examples of fluororesins include polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkylvinylethercopolymer, and tetrafluoroethylene-ethylene copolymer. Examples of polyolefin monomers include ethylene, propylene, 4-methylpentene-1, and 1-butene. Polyolefins obtained by simply polymerizing or copolymerizing these monomers may be used. In addition, two or more kinds of such polyolefins may be blended, or laminated in layers. Of these, PTFE porous material is particularly preferred because it can keep permeability even in a small area and has a high function of preventing water or dust from invading the inside of the housing.
As shown in FIG. 1 through FIG. 3, are in for cement material 5 may be laminated to the breathable film 4. When the reinforcement material 5 is laminated to one side of the breathable film 4 in such a manner, the reinforcement material 5 may be laminated to a surface opposite to the surface on which the reinforcement material 5 of the breathable film 4 is laminated as shown in FIGS. 1 through 3. The material, structure and form of the reinforcement material 5 are not limited particularly. It is, however, preferable to use a material having a pore size larger than that of the breathable film 4 and superior in gas permeability, such as woven fabric, nonwoven fabric, mesh, net, sponge, foam, metal porous material, or metal mesh. When heat resistance is required, it is preferable to use a reinforcement material made of polyester, polyamide, aramid resin, polyimide, fluororesin, ultra high molecular weight polyethylene, or metal. Incidentally, although the reinforcement material 5 is laminated to one side of the breathable film 4 in the embodiment shown in FIGS. 1 through 3, the reinforcement material 5 may be laminated to the both sides of the breathable film 4. The breathable films 4 may be laminated on both sides of the reinforcement material 5.
As for the method for laminating the reinforcement material 5 to the breathable film 4, they may be put on top of each other simply, or joined to each other. For example, the joining may be performed in a method of adhesive lamination, thermal lamination, heating deposition, ultrasonic deposition, or bonding with a bonding agent. For example, when the breathable film 4 and the reinforcement material 5 are laminated by thermal lamination, a part of the reinforcement material 5 may be heated and melted to be bonded to the breathable film 4. Thus, the breathable films 4 are bonded to the reinforcement material 5 without using adhesive, unnecessary weight increase and degradation in the air permeability can be avoided. Alternatively, the breathable film 4 and the reinforcement material 5 may be bonded with a fusion bonding agent such as hot melt powder.
Air permeability (Gurley value) of a laminate laminated with the breathable film 4 and the reinforcement material 5 is preferably in a rage of 0.1�300 sec/100 cm3, more preferably in a range of 1.0�100 sec/100 cm3. The water resistant pressure is preferably not less than 1.0 kPa.
As for the method for supporting the breathable film 4 on the supporting portion 2 a, a method of heating deposition, ultrasonic deposition or bonding using a bonding agent is suitable because peeling or floating hardly occurs. From the point of view of handiness, heating deposition or ultrasonic deposition is preferred. When the reinforcement material 5 is laminated to the breathable film 4, any supporting method may be employed without particular limitation as long as the reinforcement material 5 can be fixedly attached to the support 2. Incidentally, when a high liquid-repellent property is required, preferably, the reinforcement material 5 is fixedly attached to the supporting portion 2 a while the surface higher in liquid-repellent property faces the outside of the housing.
A thickness of the breathable film 4 or, the laminate member laminated the breathable film 4 and the reinforcement material 5 is preferably set in a range between 1 μm and 5 mm. If the film is thinner than 1 μm, the film is easily broken, and if the film is thicker than 5 mm, it is difficult to support the film on the supporting portion.
In addition, when a seal portion 2 d is provided on the surface of the supporting portion 2 a facing the housing as shown in FIG. 5, the adhesion or air tightness between the housing 7 and the ventilation member 1 can be enhanced. Particularly, when thermoplastic resin other than elastomer is used for the supporting portion 2 a, it is preferable to form the seal portion 2 d so as to enhance the sealing performance.
Examples of preferred materials for the seal portion include elastomers such as nitrile-butadiene rubber (NBR), ethylene-propylene rubber (EPM or EPDM), silicone rubber, fluoric rubber, acrylic rubber, hydro-nitrile-butadiene rubber (HNBR), foamed materials, or formed materials with adhesive layers.
For example, the seal portion 2 d may be provided by outer fitting an O-ring of the above-mentioned material to the insertion portion 2 b, or may be formed on one side of the supporting portion 2 a by dichromatic molding. Further, the formed materials having adhesive layers may be pasted on a surface opposite to the housing 7 of the supporting portion 2 a. In addition, when the support 2 has a protective portion 2 e covering at least a part of the breathable film 4 from above of the breathable film 4 as shown in FIGS. 6A and 6B, it is possible to reduce the possibility that the breathable film 4 is damaged by external force or the ventilation is blocked by sand or mud accumulated on the surface of the breathable film.
The shape of the protective portion 2 e is not limited particularly as long as it is a shape not spoiling the permeability of the ventilation member 1. It is, however, preferable that a plurality of opening portions 2 f are formed in positions where they cannot be viewed when observed in the gas permeable direction, for example, in the side surface of the protective portion 2 e as in the embodiment shown in FIGS. 6A and 6B. Incidentally, opening portions 2 f maybe also formed in an upper surface 2 g of the protective portion 2 e as long as the opening portions 2 f do not spoil the effect of protecting the breathable film 4. In addition, it is preferable that the opening portions 2 f are formed as divided small holes from the point of view of keeping the strength of the protective portion 2 e and effectively preventing invasion of matters.
As the material of the protective portion 2 e, a material similar to that of the other portion of the support 2 may be used. The method for integrating the protective portion 2 e with the other portion of the support 2 is not limited particularly. The integration may be attained in a method of heating deposition, ultrasonic deposition, vibration deposition, bonding using a bonding agent, fitting, or screwing. Particularly, heating deposition or ultrasonic deposition is preferred because of its low cost and easiness.
In this embodiment, the other ventilation member of the invention is described by accompanying FIGS. 7, 8A and 8B. Unless specific explanation is provided, this embodiment is configured similarly to the previous embodiment, like elements are given like reference numerals so that the explanations are omitted.
While the ventilation member shown in FIGS. 1, 2A and 2B is provided with the insertion portion 2 b which is divided into three parts along a circumferential direction thereof and each of these three leg portions 2 h includes the lock portion 2 c at the end of the insertion start side (See FIG. 2B), the ventilation member 21 of this embodiment has the insertion portion 2 b which is divided into six parts along the circumferential direction of thereof. Among these six leg portions 2 h, three of the leg portions 2 h include the lock portion 2 c. The leg portions 2 h which include the lock portions 2 c and the leg portions. 2 h which do not include the lock portions 2 c are alternately disposed in the circumferential direction.
As shown in the ventilation member of FIGS. 1, 2A and 2B, in a case that each of the leg portions 2 h includes the lock portion 2 c, for reducing the insertion pressure of the insertion portion 2 b into the opening portion 8, it is proposed to make the width of the leg portion 2 h smaller (namely, the slit 2 i becomes wider) so that the leg portions 2 h are easily bent inwardly, or it is proposed to make a sliding contact area of the lock portion 2 c to the opening portion 8 smaller (See FIG. 1). However, if the width of the leg portions 2 h becomes smaller, the insertion portion 2 b can be easily rotated in the opening portion 8 since the contact area between the insertion portion 2 b and the opening portion 8 is reduced. Therefore the stability is decreased.
In the ventilation member 21 of this embodiment, as the insertion portion 2 b is divided into more parts in the circumferential direction, and include leg portions 2 h which do not have the lock portions 2 c, the leg portions 2 h can be easily bent inwardly and the sliding contact area between the lock portions 2 c and the opening portion 8 is decreased so that the insertion pressure is decreased. Further, the contact area of the insertion portion 2 b with the opening portion 8 is reserved so that the positional shift after insertion is inhibited thereby enhancing the stability.
In this embodiment, as shown in FIG. 8A, a projecting portion 2 j of the protective portion 2 e are fitted to a groove 2 k formed on a opposite surface to the housing 7 of the supporting portion 2 a so that the protective portion 2 e and the supporting portion 2 a are integrated. As the protective portion 2 e can be detached from the supporting portion 2 a, the breathable film 4 can be replaced by new breathable film 4.
In this embodiment, the other ventilation member of the invention is described by accompanying FIGS. 9A to 11. Unless specific explanation is provided, this embodiment is configured similarly to the previous embodiment, like elements are given like reference numerals so that the explanations are omitted.
In the ventilation members described as the first and second embodiments, two or more leg portions 2 h include the tapered lock portion 2 c (See FIGS. 2B and 8B), none of the leg portions 2 h of the ventilation member 31 in this embodiment includes lock portion. Outer diameter of the insertion portion 2 b is nearly equal to the diameter of the opening portion 8 so that the ventilation member 31 is fixed to the housing 7 by press-fitting the insertion portion 2 b into the opening portion 8.
As shown in FIG. 10, it is preferable that a pull-out prevention member 9 is provided on an inside portion of the insertion portion 2 b at the insertion stating side thereof, which is projected into the housing 7 so that the insertion start side of the insertion portion 2 b is spread from the inside thereof. By a kit for forming the breathable structure comprising the ventilation member 31 and the pull-out prevention member 9, the ventilation member 31 can be fixed to the housing 7 more reliably.
As shown in FIGS. 10 and 11, the pull-out prevention member 9 includes a columnar portion 9 a which is inserted into the insertion portion 2 b inserted into the opening portion 8 so as to penetrate the opening portion 8, so that the insertion portion 2 b is spread from the inside thereof. On the columnar portion 9 a, an air hole 9 b communicating with the through hole 3 of the ventilation member when the pull-out prevention member 9 is inserted into the insertion portion 2 b is formed. Outer diameter of the columnar portion 9 a becomes larger from an insertion stating side to an insertion end side of the columnar portion 9 a. The pull-out prevention member 9 further includes a flange portion 9 c provided on the insertion end side of the columnar portion 9 a and having a larger outer diameter than the opening portion 8 of the housing 7 so that the pull-out prevention member 9 is prevented from being excessively inserted into the insertion portion 2 b. As shown in FIGS. 10 and 11, the pull-out prevention member 9 may further include a turn back portion 9 d formed from the flange portion 9 c so as to surround the columnar portion 9 a. If the turn back portion 9 d is formed so that the leg portions 2 h are fitted between the turn back portion 9 d and the columnar portion 9 a, the pull-out prevention member 9 is mounted on the ventilation member 31 more reliably. Further, if the turn back portion 9 d is formed so that an end face 9 e of the turn back portion 9 d abuts with a back surface 7 a with respect to a surface of the housing 7 opposing the supporting portion 2 a in a state that the columnar member 9 a is inserted into the insertion portion 2 b, the ventilation member 31 can be fixed to the housing 7 so that the insertion portion 2 b does not slide within the opening portion 8. As the pull-out prevention member 9 can be removed in accordance with the necessity, the ventilation member can be replaced. Fitting grooves and fitting projections for fitting or external threads and internal threads for screwing or the like may be formed on the inside of the insertion portion 2 b or the outside of the columnar portion 9 a. Material used for the pull-out prevention member 9 is not limited specifically. The material similar to that of the support may be used. Material having elasticity like a rubber such as thermoplastic elastomer may be used.
Next, FIGS. 12A, 12B, 13A, 13B, 14, 15A and 15B show examples of vented housings to which ventilation members according to the invention have been fixed respectively. The ventilation member 1 shown in FIG. 1 has been fixed to a connector shown in FIGS. 12A and 12B. The ventilation member 1 shown in FIGS. 6A and 6B has been fixed to an automobile lamp shown in FIGS. 13A and 13B. The ventilation member 1 shown in FIG. 5 has been fixed to an electric toothbrush shown in FIG. 14. The ventilation member 1 shown in FIG. 1 has been fixed to an ECU shown in FIGS. 15A and 15B. However, housings to which ventilation members according to the invention are fixed are not limited to these housings. In addition, the number of ventilation members according to the invention to be fixed to a housing is not limited particularly. A plurality of ventilation members may be attached to different sides of a housing or one and the same side of a housing.
Example 1 As Example 1, the ventilation member shown in FIGS. 6A and 6B was produced as follows.
First, the support 2 having a structure shown in FIGS. 6A and 6B was obtained by injection molding out of PBT (CG7640 made by Teijin Ltd., melting point 225� C.). The supporting portion 2 a of the obtained support 2 was 2.5 mm in thickness and 16 mm in outer diameter, the insertion portion 2 b of the obtained support 2 (where the lock portion 2 c is not formed) was 5.5 mm in outer diameter, and the through holes 3 provided in the insertion portion 2 b were 3.5 mm in inner diameter. The protection layer 2 e was 3.5 mm in thickness, and, 16 mm in outer diameter.
Successively, the laminate 6 was punched out with an outer diameter of 8 mm. The reinforcement material 5 of the laminate 6 was brought into contact with the supporting portion 2 a so as to cover the through holes 3 provided in the supporting portion 2 a, and contact-bonded to the supporting portion 2 a by heating deposition at a temperature of 260� C. and at a pressure of 5.0�105 Pa for 30 seconds. Next, the protective portion 2 e and the supporting portion 2 a were fixedly attached to each other by heating deposition. Finally, an O-ring made of EPDM as the seal portion 2 d was outer-fitted to the insertion portion 2 b. Thus, the ventilation member A was obtained.
On the other hand, a housing to which the ventilation member A was to be fixed was produced by injection molding out of PBT (CG7640 made by Teijin Ltd., melting point 225� C.). The outer wall of the obtained housing 7 was 2 mm in thickness, and the opening portion 8 was 6.5 mm in inner diameter. The ventilation member A was press-fitted to the opening portion 8 of the housing 7 by hand. Thus, a vented housing A was obtained.
Example 2 As Example 2, the ventilation member shown in FIGS. 6A and 6B was produced as follows.
First, the support 2 having a structure shown in FIGS. 6A and 6B was obtained by injection molding out of PP (AW564 made by Sumitomo Chemical Co., Ltd., melting point 165� C.). The supporting portion 2 a of the obtained support 2 was 2.5 mm in thickness and 16 mm in outer diameter, the insertion portion 2 b of the obtained support (where the lock portion 2 c is not formed) was 5.5 mm in outer diameter, and the through holes 3 provided in the insertion portion 2 b were 3.5 mm in inner diameter. The protective portion 2 e was 3.5 mm in thickness and 16 mm in outer diameter.
Successively, the laminate 6 was punched out with an outer diameter of 8 mm. The reinforcement material 5 of the laminate 6 was brought into contact with the supporting portion 2 a so as to cover the through holes 3 provided in the supporting portion 2 a, and contact-bonded to the supporting portion 2 a by heating deposition at a temperature of 260� C. and at a pressure of 5.0�105 Pa for 30 seconds. Next, the protective portion 2 e and the supporting portion 2 a were fixedly attached to each other by heating deposition. Finally, an O-ring made of NBR as the seal portion 2 d was outer-fitted to the insertion portion 2 b. Thus, the ventilation member B was obtained. The ventilation member B was press-fitted to the opening portion 8 of a housing 7 similar to that in Example 1 by hand. Thus, a vented housing B was obtained.
Example 3 As Example 3, the ventilation member shown in FIGS. 7, 8A and 8B was produced as follows.
First, the support 2 having a structure shown in FIGS. 7, 8A and 8B was obtained by injection molding out of PBT (CG7640 made by Teijin Ltd., melting point 225� C.). The supporting portion 2 a of the obtained support 2 was 3 mm in thickness and 16.5 mm in maximum outer diameter, the insertion portion 2 b of the obtained support (where the lock portion 2 c is not formed) was 10 mm in outer diameter, and the through hole 3 provided in the insertion portion 2 b was 8.5 mm in inner diameter, the dimension A was 4.25 mm and the dimension B was 2.1 mm. The protective portion 2 e was 4.5 mm in thickness and 17 mm in outer diameter.
Successively, the laminate 6 which was fabricated as described in Example 2 was punched out with an outer diameter of 11 mm, and the laminate was bonded by fusion bonding to the supporting portion 2 a in the same manner as Example 2. Next, the protective portion 2 e and the supporting portion 2 a were fixedly attached to each other by heating deposition. Finally, an O-ring made of EPDM as the seal portion 2 d was outer-fitted to the insertion portion 2 b. Thus, the ventilation member C was obtained.
On the other hand, the housing to which the ventilation member C is to be fixed was obtained by injection molding out of PBT (CG7640 made by Teijin Ltd., melting point 225� C.) . The outer wall of the obtained housing 7 was 2 mm in thickness. The opening portion 8 was 10.4 mm in inner diameter. The ventilation member C was press-fitted to the opening portion 8 of the housing 7 by hand. Thus, a vented housing C was obtained.
Example 4 As Example 4, the ventilation member shown in FIGS. 7, 8A and 8B was produced as follows.
First, the support 2 having a structure shown in FIGS. 7, 8A and 8B was obtained by injection molding out of PP (AW564 made by Sumitomo Chemical Co., Ltd., melting point 165� C.). The supporting portion 2 a of the obtained support 2 was 3 mm in thickness and 16.5 mm in maximum outer diameter, the insertion portion 2 b of the obtained support (where the lock portion 2 c is not formed) was 10 mm in outer diameter, and the through hole 3 provided in the insertion portion 2 b was 8.5 mm in inner diameter, the dimension A was 4.25 mm and the dimension B was 2.1 mm. The protective portion 2 e was 4.5 mm in thickness and 17 mm in outer diameter.
Successively, the laminate 6 which was fabricated as described in Example 1 was punched out with an outer diameter of 11 mm, and the laminate was bonded by fusion bonding to the supporting portion 2 a in the same manner as Example 1. Next, the protective portion 2 e and the supporting portion 2 a were fixedly attached to each other by heating deposition. Finally, an O-ring made of silicone rubber as the seal portion 2 d was outer-fitted to the insertion portion 2 b. Thus, a vented housing D was obtained.
Example 5 As Example 5, the ventilation member shown in FIG. 9 was produced as follows.
First, the support 2 having a structure shown in FIG. 9 was obtained by injection molding out of PBT (CG7640 made by Teijin Ltd., melting point 225� C.). The supporting portion 2 a of the obtained support 2 was 3 mm in thickness and 16.5 mm in maximum outer diameter, the insertion portion 2 b of the obtained support (where the lock portion 2 c is not formed) was 10 mm in outer diameter, and the through hole 3 provided in the insertion portion 2 b was 8.5 mm in inner diameter, the dimension A was 4.25 mm and the dimension B was 2.1 mm. The protective portion 2 e was 4.5 mm in thickness and 17 mm in outer diameter.
Successively, the laminate 6 which was fabricated as described in Example 1 was punched out with an outer diameter of 11 mm, and the laminate was bonded by fusion bonding to the supporting portion 2 a in the same manner as Example 1. Next, the protective portion 2 e and the supporting portion 2 a were fixedly attached to each other by heating deposition. Finally, an EPDM foamed sheet with adhesive layer (Seal-Saver, SA-612, made by Nitto Denko Corporation, thickness 4 mm), which was punched out in a torus-shape having an outer diameter of 15 mm and an inner diameter of 10.5 mm, was pasted on the surface opposing the housing of the supporting portion 2 a. Thus, the ventilation member E was obtained.
Next, the pull-out prevention member 9 of the ventilation member having a structure shown in FIG. 11 was obtained by injection molding out of PBT (CG7640 made by Teijin Ltd., melting point 225� C.). The air hole 9 b of the pull-out prevention member 9 was 4 mm in diameter, the columnar portion 9 a was 8 mm in minimum outer diameter, and 9 mm in maximum outer diameter. The length of the columnar member 9 a (which is defined as a length from a portion where the outer diameter is minimum to a portion where the outer diameter is maximum) was 4.0 mm.
The ventilation member E was inserted into the opening portion 8 of the housing 7 fabricated as described in Example 3, then the pull-out prevention member 9 was inserted into the insertion portion 2 b which was inserted into the opening portion 8. Thus, a vented housing E was obtained.
Comparative Example 1 The ventilation member F shown in FIGS. 17A and 17B was produced by molding and hot curing out of a material having styrene-butadiene rubber (Tufdene 1000 made by Asahi-Kasei Corp., bending modulus 4.0�108 N/m2) as its chief component. The obtained ventilation member F was 7.5 mm in inner diameter, 11.5 mm in outer diameter, 2 mm in thickness, and 40 mm in height H.
On the other hand, the housing 50 shown in FIGS. 17A and 17B was produced by injection molding as a housing to which the ventilation member F was to be fixed. The neck portion 50 a was formed into a hollow columnar shape, whose outer diameter was larger by 20% than the inner diameter of the ventilation member F. One end of the ventilation member F was outer-fitted to the neck portion 50 a for 8 mm. Thus, a vented housing was obtained.
Comparative Example 2 The cover part 61 and the substantially cylindrical body 62 shown in FIGS. 18A and 18B were produced by injection molding out of PP (UBE Polypro J815HK made by Ube Industries, Ltd., bending modulus 1.47�109N/m2) and out of thermoplastic elastomer (Milastomer 6030 made by Mitsui Chemicals Inc., bending modulus 4.41�108 N/m2), respectively. The obtained cover part 61 was 17.5 mm in outer diameter and 15.5 mm in inner diameter, and the obtained substantially cylindrical body 62 was 15.5 mm in maximum outer diameter and 7.5 mm in inner diameter in the top portion opening portion 62 a. In addition, a PTFE porous material (Microtex NTF1026 made by Nitto Denko Corp., 0.02 μm in thickness, 0.6 μm in average pore size, and 80% in porosity) was prepared as the ventilation filter 63. Next, the ventilation filter 63 was brought into contact with the bottom portion of the obtained substantially cylindrical body 62, and then contact-bonded to the bottom portion of the obtained substantially cylindrical body 62 by heating deposition at a temperature of 150� C. and at a pressure of 10�104 Pa for 10 seconds. Then, the substantially cylindrical body 62 was fitted to the upper cover part 61. Thus, the ventilation member G was obtained.
On the other hand, the housing 50 shown in FIG. 18B was produced by injection molding as a housing to which the ventilation member G was to be fixed. The neck portion 50 a was formed into a hollow columnar shape, whose outer diameter was larger by 20% than the inner diameter of the top portion opening portion 62 a. The ventilation member G was outer-fitted to the neck portion 50 a for 8 mm. Thus, a vented housing G was obtained.
Comparative Example 3 As Comparative Example 3, the ventilation member shown in FIG. 16 was produced as follows.
A structure shown in FIG. 16 was obtained by injection molding out of PBT (CG7640 made by Teijin Ltd., melting point 225� C.). The supporting portion 2 a of the obtained support 2 was 3 mm in thickness and 16.5 mm in maximum outer diameter, the insertion portion 2 b of the obtained support (where the lock portion 2 c is not formed) was 10 mm in outer diameter, and the through hole 3 provided in the insertion portion 2 b was 8.5 mm in inner diameter, the dimension A was 4.25 mm and the dimension B was 6.2 mm. The protective portion 2 e was 4.5 mm in thickness and 17 mm in outer diameter.
Successively, the laminate 6 which was fabricated as described in Example 1 was punched out with an outer diameter of 11 mm, and the laminate was bonded by fusion bonding to the supporting portion 2 a in the same manner as Example 1. Next, the protective portion 2 e and the supporting portion 2 a were fixedly attached to each other by heating deposition. Finally, an EPDM foamed sheet with adhesive layer (Seal-Saver, SA-612, made by Nitto Denko Corporation, thickness 4 mm), which was punched out in a torus-shape having an outer diameter of 15 mm and an inner diameter of 10.5 mm, was pasted on the surface opposing the housing of the supporting portion 2 a. Thus, the ventilation member H was obtained. The ventilation member H was press-fitted to the opening portion 8 of the housing 7 fabricated as described in Example 3 by hand. Thus, a vented housing H was obtained.
Pull-out force was measured in the following method upon the vented housings obtained thus. As a result, the ventilation members A through E (Examples 1 through 5) and the ventilation member H (Comparative Example 3) could not be pulled out. The pull-out force of the ventilation member F (Comparative Example 1) was 7.5 N, and the pull-out force of the ventilation member G (Comparative Example 2) was 19.0 N.
Further, for the ventilation members C through E (Examples 3 through 5) and the ventilation member H (Comparative Example 3), 100 pieces of each kind of ventilation members were contained respectively in a package of 1000 mm on a side, and the package was shaken in various directions for ten minutes. The interlacement of the leg portions 2 h between the one and other ventilation members, and occurrence of the breathable film breakages were visually checked. As for the ventilation members C through E, interlacement among the leg portions 2 h and breakage of the breathable films were not found. On the other hand, as for the ventilation members H, 20 pieces among 100 were found interlaced. Thus, it has been clarified that the interlacement of the leg portions as well as breakage of the breathable film 4 in one ventilation member by a leg portion of the other ventilation member can be inhibited by providing the dimension A larger than the dimension B.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5038794 *Oct 29, 1988Aug 13, 1991Valkenburg Nanci L VanCapillary blood collector and methodUS5080001 *Jul 7, 1989Jan 14, 1992Sumitomo Electric Industries Ltd.Resin molded product, method of producing same, and air vent device using sameUS5522769Nov 17, 1994Jun 4, 1996W. L. Gore & Associates, Inc.Gas-permeable, liquid-impermeable vent coverUS5829936 *Jun 18, 1997Nov 3, 1998Okuma CorporationFlush-mounted plug for filling a threaded holeUS5914415Aug 8, 1997Jun 22, 1999Nitto Denko CorporationVent filter memberUS6017060 *Nov 26, 1997Jan 25, 2000Trw Vehicle Safety Systems Inc.Pressure relief plugUS6364924Apr 28, 2000Apr 2, 2002Nitto Denko CorporationAir permeable cap and outdoor lamp, automobile lamp and electrical component comprising sameJP2001143524A Title not availableJPH1085536A Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS8141678 *Sep 11, 2006Mar 27, 2012Nitto Denko CorporationSound-permeable film, electronic component with sound-permeable film, and method of producing circuit board having electronic component mounted thereonUS8475554 *Dec 1, 2005Jul 2, 2013Nitto Denko CorporationPermeable member, and permeable casing and electrical component using the sameUS20090047890 *Nov 15, 2006Feb 19, 2009Nitto Denko CorporationVent MemberUS20130051047 *Aug 15, 2012Feb 28, 2013Ichikoh Industries, Ltd.Vehicle door mirror* Cited by examinerClassifications U.S. Classification454/270, 454/370, 362/345, 96/6International ClassificationH05K5/02, F16B5/06, F21S8/10, H02K5/10, F21V31/03, F21W101/10, B01D19/00Cooperative ClassificationF21S48/335, H02K2205/09, H05K5/0213, B29C66/7292, F21V31/03, B29C66/71, B29C66/72941, H02K5/10European ClassificationB29C66/71, B29C66/72941, B29C66/7292, H05K5/02D, H02K5/10, F21V31/03Legal EventsDateCodeEventDescriptionMar 13, 2013FPAYFee paymentYear of fee payment: 8Jul 8, 2009FPAYFee paymentYear of fee payment: 4May 15, 2003ASAssignmentOwner name: NITTO DENKO CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MASHIKO, HIROAKI;YANAGI, TOSHIKI;NISHII, HIROYUKI;AND OTHERS;REEL/FRAME:014080/0270Effective date: 20030502RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google