JP2012143421A - Needle insertion valve, and hollow ball - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a needle insertion valve that prevents air leakage both in non-insertion time and insertion time of an injection needle, and to provide a hollow ball having this needle insertion valve.SOLUTION: The rubber-made needle insertion valve 1 with a needle passage 11 that extends in an axial direction and is inserted an injection needle for injecting air. The needle insertion valve 11 is characterized in that it is provided with a first sealing part 12 which is released when no injection needle is inserted and which is blocked by coming into close contact with the outer circumference of the injection needle when it is inserted, and a second sealing part 13 which is blocked in close contact when no injection needle is inserted, wherein the first and the second sealing parts are provided in this order along the insertion direction of the injection needle. The hollow ball includes the needle insertion valve 1.

Description

  The present invention relates to a needle insertion valve and a hollow ball, and more particularly to a needle insertion valve that can prevent air leakage both when the injection needle is not inserted and when it is inserted, and a hollow ball equipped with the needle insertion valve. .

  For example, a hollow ball such as a soccer ball, volleyball, basketball, handball, rugby ball, or tennis ball has an internal space filled with air. However, since the air filled in the internal space may leak to the outside over time and / or depending on the usage state, it is necessary to replenish the internal space with air. Therefore, such a hollow ball includes a needle insertion valve connected to a pump or the like through which an injection needle for injecting air is pierced or inserted.

  As such a needle insertion valve, for example, a needle insertion valve having a needle passage through which an injection needle for air injection is inserted has been proposed. For example, in FIG. 3 and FIG. 4 of Patent Document 1, as a needle insertion valve, “a cylindrical portion (2) made of elastic rubber, a side surface of the cylindrical portion (2) made of the same elastic rubber material as the cylindrical portion (2) The rod (3) formed integrally with the cylindrical portion (2), the micro-hole (4) provided in the cylindrical portion (2), and the worm (1) consisting of the cut portion (5) "are described.

  Further, Patent Document 2 states that “a thin flange portion that is bonded to the inner peripheral surface of the ball spherical shell, and a protrusion that protrudes outward from the flange portion and engages with a small hole formed in the ball spherical shell. Part, a bottomed opening that opens to the outer surface of the protrusion, a columnar valve main body that extends inward from the flange, and the rubber valve that penetrates the inner end surface of the valve main body from the bottom of the opening A rubber valve having a slit formed therein and having a tapered shape in which the outer diameter of the valve body gradually decreases from the outside toward the inside (claims 1 and 2, etc.). ).

  Further, Patent Document 3 states that “a flange portion that is bonded to the inner peripheral surface of the ball ball shell, and a protrusion that protrudes outward from the flange portion and engages with a small hole formed in the ball ball shell. A bottomed opening that opens to the outer surface of the protrusion, a columnar body extending from the flange to the inner side of the ball, and an inner end surface of the body from the bottom of the opening to the inside of the rubber valve. The body portion is formed in a columnar shape having different longitudinal and transverse lengths substantially parallel to the inner end surface, and the length direction of the slit and the major axis direction of the body portion are A "rubber valve in which the slit is formed so as to penetrate in a substantially orthogonal direction" is described (claims 1 and 2, etc.).

Japanese Utility Model Publication No. 61-54867 JP 2004-201733 A JP 2006-55335 A

  An object of the present invention is to provide a needle insertion valve that can prevent air leakage both when the injection needle is not inserted and when it is inserted, and a hollow ball provided with the needle insertion valve.

As means for solving the problems,
Claim 1 is a rubber needle insertion valve that extends in the axial direction and has a needle passage through which an injection needle for air injection is inserted, and when the injection needle is not inserted through the needle passage A first seal portion that opens and closes tightly to an outer periphery of the injection needle when the injection needle is inserted; and a second seal portion that closes close when the injection needle is not inserted. A needle insertion valve characterized by having in this order along the insertion direction of the injection needle,
The needle insertion valve according to claim 1, wherein the first seal portion has an inner surface having an inner diameter smaller than an outer diameter of the injection needle.
The needle insertion valve according to claim 1 or 2, wherein the first seal portion is a bottomed hole extending along the axial direction.
The needle insertion valve according to claim 1 or 2, wherein the first seal portion is at least one annular body protruding inside the needle passage.
Claim 5 is the needle insertion valve according to any one of claims 1 to 4, wherein the second seal part is a slit.
Claim 6 is the needle insertion valve according to any one of claims 1 to 5, wherein the second seal portion is connected to the first seal portion.
A seventh aspect of the present invention includes a guide hole for guiding the injection needle to the first seal portion on the upstream side of the first seal portion in the insertion direction. Or the needle insertion valve according to item 1,
An eighth aspect is a hollow ball comprising the needle insertion valve according to any one of the first to seventh aspects.

  The needle insertion valve according to the present invention is opened when the injection needle is not inserted, and is closed when the injection needle is inserted, and the first seal portion that closes and closes the outer periphery of the injection needle is inserted. Since the needle passage has the second seal portion that is closely closed when the injection needle is not inserted in this order along the insertion direction of the injection needle, air can be used both when the injection needle is not inserted and when the injection needle is inserted. Leakage can be prevented. The hollow ball according to the present invention includes the needle insertion valve according to the present invention.

  Therefore, according to the present invention, it is possible to provide a needle insertion valve that can prevent air leakage both when the injection needle is not inserted and when it is inserted, and a hollow ball provided with the needle insertion valve.

FIG. 1 is a view showing a needle insertion valve which is an example of a needle insertion valve according to the present invention, and FIG. 1A is a front view showing a needle insertion valve which is an example of a needle insertion valve according to the present invention. FIG.1 (b) is sectional drawing which shows the cross section of the needle insertion valve which is an example of the needle insertion valve which concerns on this invention. FIG. 2 is a view showing a needle insertion valve which is another example of the needle insertion valve according to the present invention, and FIG. 2A shows a needle insertion valve which is another example of the needle insertion valve according to the present invention. FIG. 2B is a cross-sectional view showing a cross section of a needle insertion valve which is another example of the needle insertion valve according to the present invention. FIG. 3 is a view showing a needle insertion valve which is another example of the needle insertion valve according to the present invention, and FIG. 3A is a needle insertion valve which is another example of the needle insertion valve according to the present invention. FIG. 3B is a cross-sectional view showing a cross section of a needle insertion valve that is another example of the needle insertion valve according to the present invention. FIG. 4 is a view showing a needle insertion valve which is still another example of the needle insertion valve according to the present invention, and FIG. 4A is a needle which is still another example of the needle insertion valve according to the present invention. It is a front view which shows an insertion valve, FIG.4 (b) is sectional drawing which shows the cross section of the needle insertion valve which is another example of the needle insertion valve which concerns on this invention. FIG. 5 is a view showing a state where an injection needle is inserted through a needle insertion valve which is an example of a needle insertion valve according to the present invention, and FIG. 5A is a needle insertion which is an example of a needle insertion valve according to the present invention. It is sectional drawing which shows the state which penetrated the injection needle to the valve, FIG.5 (b) is sectional drawing which shows the cross section in the AA line of Fig.5 (a), FIG.5 (c) concerns on this invention It is sectional drawing which shows the state in the middle of removing the injection needle which penetrated the needle insertion valve which is an example of a needle insertion valve. FIG. 6 is a view showing a state where the injection needle is inserted into and removed from a needle insertion valve which is another example of the needle insertion valve according to the present invention, and FIG. 6 (a) shows another needle insertion valve according to the present invention. FIG. 6B is a cross-sectional view showing a state where an injection needle is inserted into a needle insertion valve which is an example, and FIG. 6B is a diagram illustrating the removal of an injection needle inserted into a needle insertion valve which is another example of the needle insertion valve according to the present invention. It is sectional drawing which shows the state in the middle of doing. 7 is a view showing a needle insertion valve which is an example of a conventional needle insertion valve, and FIG. 7A is a front view showing a needle insertion valve which is an example of a conventional needle insertion valve. FIG. 7B is a cross-sectional view showing a cross section of a needle insertion valve that is an example of a conventional needle insertion valve, and FIG. 7C shows a state in which an injection needle is inserted into a needle insertion valve that is an example of a conventional needle insertion valve. It is sectional drawing shown. FIG. 8 is a schematic sectional view showing a hollow ball which is an example of a hollow ball according to the present invention, and FIG. 8A is a schematic sectional view showing an entire hollow ball which is an example of a hollow ball according to the present invention. FIG. 8B is a schematic enlarged sectional view showing the vicinity of a needle insertion valve mounting portion of a hollow ball which is an example of the hollow ball according to the present invention.

  The needle insertion valve according to the present invention is a valve which is attached to a hollow ball and through which an injection needle for air injection is pierced or inserted. The hollow ball to which the needle insertion valve according to the present invention is attached may be any ball as long as it has a space inside and is filled with a gas such as air at a predetermined air pressure. Specifically, a soccer ball, a volleyball, a basketball, a handball, a rugby ball, a tennis ball, etc. are mentioned.

  The injection needle inserted into and removed from the needle insertion valve according to the present invention is usually a tubular body, and the tip thereof does not need to be pointed, but has a flat tip surface or a tip having a semispherical or semi-elliptical spherical shape. The surface may be easy to handle and safe. Although depending on the hollow ball to which the needle insertion valve according to the present invention is mounted, the injection needle is generally circular or elliptical in cross section perpendicular to its axis, and its outer diameter (major axis) is For example, it is 0.8-2.4 mm.

  The needle insertion valve according to the present invention is attached to the hollow ball, particularly the inner surface thereof, such that a part of the needle insertion valve, for example, one end surface in the axial direction is exposed on the surface of the hollow ball. Therefore, the needle insertion valve according to the present invention can be referred to as a hollow ball needle insertion valve.

  The needle insertion valve according to the present invention is usually formed in a tubular body, and the cross-sectional shape perpendicular to the axis is circular or elliptical. The needle insertion valve according to the present invention is set to an appropriate size according to the type of the hollow ball to be mounted. In the needle insertion valve according to the present invention, an injection needle for injecting air connected to a pump or the like is pierced or inserted, and after replenishing air, the inserted or inserted injection needle is removed. Therefore, the needle insertion valve according to the present invention has a needle passage extending in the axial direction, that is, a needle passage communicating from one end surface to the other end surface in the axial direction, more specifically, a needle passage penetrating in the axial direction. The needle passage is inserted with an injection needle for air injection. The needle passage is formed along the axis of the needle insertion valve, preferably coaxially with the axis, so that the injection needle is inserted and removed when air is replenished and the inner space of the hollow ball is filled. It functions to prevent leakage of air.

  The needle passage in the needle insertion valve according to the present invention is opened when the injection needle is not inserted, i.e., when the injection needle is not inserted, and closed when the injection needle is inserted, i.e., when the injection needle is inserted, close to the outer periphery of the injection needle. It has 1 seal part. The first seal portion functions to close the inner space of the hollow ball from the outside of the hollow ball while maintaining close contact with the injection needle, that is, confidentiality when the injection needle is inserted. Therefore, the first seal portion may be configured to be in close contact with the outer periphery of the inserted injection needle to block communication between the inside and the outside of the hollow ball, that is, to close the inside of the hollow ball, For example, it has an annular inner surface that has a gap when the injection needle is not inserted, and that is in close contact with the outer periphery of the injection needle when the injection needle is inserted. The inner surface only needs to have a shape that is in close contact with the outer periphery of the inserted injection needle, for example, a cross section perpendicular to the axis of the injection needle, such as a circular, elliptical, or polygonal outline in a plane perpendicular to the axis of the needle passage. Examples thereof include a shape and a similar shape, and a cross-sectional shape perpendicular to the axis of the injection needle and a similar shape are preferable. Examples of the first seal portion having such an inner surface include a bottomed hole extending along the axial direction of the needle insertion valve, and an annular body protruding inside the needle passage. The first seal portion is opened with a gap in the radial direction of the needle passage when the injection needle is not inserted, that is, is not closed. If the first seal portion is released when the injection needle is not inserted, it becomes a guideline for inserting the injection needle.

  Therefore, the first seal portion, that is, the inner surface has a gap distance smaller than the outer diameter of the injection needle. This gap distance is, for example, the outer diameter of the injection needle in that the ease of insertion / removal of the injection needle (hereinafter sometimes referred to as injection needle insertion / removal) and the prevention of air leakage can be achieved at a high level. It is preferably 50% or more and less than 100%, particularly preferably 70 to 95%. Specifically, the gap distance is preferably 0.4 to 2.4 mm, and particularly preferably 0.6 to 2.2 mm.

  The needle passage in the needle insertion valve according to the present invention is closely attached to both sides in the axial direction of the needle passage when the injection needle is not inserted, preferably attached to the hollow ball, and when the injection needle is not inserted. That is, it has the 2nd seal part which obstruct | occludes the internal space and the outer side of a hollow ball. The second seal portion has a function of closing the internal space of the hollow ball from the outside of the hollow ball while maintaining the airtightness of the internal space of the hollow ball when the injection needle is not inserted. Therefore, the second seal portion only needs to be configured to be in a closed state when not inserted, at least when the injection needle is not inserted. For example, a slit or the like is employed. Examples of such slits include a single character slit, a trident slit, and a cross slit. The dimension of the slit, that is, the slit width is preferably 120 to 200% with respect to the outer diameter of the injection needle, for example, in that the insertion / removal property of the injection needle and the prevention and prevention of air leakage can be achieved at a high level. It is particularly preferably 140 to 170%, specifically, 1.2 to 4 mm is preferable, and 1.5 to 3.5 mm is particularly preferable. Note that the slit width is a diameter of a virtual circumscribed circle circumscribing the end of the slit. The diameter of the circumscribed virtual circumscribed circle.

  The needle passage in the needle insertion valve according to the present invention has a first seal portion and a second seal portion in this order from upstream to downstream along the insertion direction of the injection needle. That is, in the needle passage, the first seal portion is formed outside the hollow ball, and the second seal portion is formed on the inner space side of the hollow ball. The first seal portion and the second seal portion only need to be disposed in the needle passage in this order, and the first seal portion and the second seal portion may be continuously provided, and are disposed apart from each other. May be.

  In the needle insertion valve according to the present invention, since the needle passage having the first seal portion and the second seal portion is formed, the air filled in the internal space when the injection needle is inserted and removed by the first seal portion is formed. Leakage can be prevented, and leakage of the air filled in the internal space at the time of non-insertion / removal of the injection needle, that is, normal time can be prevented by the second seal portion. Therefore, when the needle insertion valve according to the present invention is mounted on the hollow ball, as will be described later, air leakage can be prevented both when the injection needle is not inserted and when the injection needle is inserted.

  The needle insertion valve according to the present invention is made of rubber. The rubber that forms the needle insertion valve is not particularly limited, and various types of rubber can be used. Examples of the rubber include synthetic rubbers such as natural rubber, isoprene rubber, butadiene rubber, nitrile rubber, acrylic rubber, fluorine rubber, and silicone rubber. Among these, silicone rubber is preferable when focusing on the fact that the injection needle can be smoothly inserted in addition to preventing air leakage. The silicone rubber is not particularly limited, and various silicone rubbers can be used. Examples thereof include dimethyl silicone rubber, methylphenyl silicone rubber, and organosilicone rubber having an alkyl group having 1 to 6 carbon atoms. The rubber may contain various commonly used additives. Such additives include, for example, dispersants, foaming agents, vulcanizing agents, antioxidants, antioxidants, fillers, pigments, colorants, processing aids, plasticizers, flame retardants, release agents. Examples include molds.

  The rubber, that is, the needle insertion valve, preferably has a rubber hardness (JIS A) of 10 to 50 °, particularly preferably 20 to 40 °. When the rubber hardness of the rubber is within the above range, the needle passage of the needle insertion valve can be closed with high airtightness. The rubber hardness (JIS A) can be measured as follows. That is, a rubber composition that forms rubber is prepared. Specifically, when the rubber composition is known, a rubber composition of that composition is prepared, and when the rubber composition is unknown, a rubber composition of the composition determined by the IR analysis method is prepared. . Then, using the prepared rubber composition, a plate-like test piece (14 mm or more × 14 mm or more × 4 mm or more) whose upper and lower surfaces are smooth and parallel is prepared, and the hardness of the test piece is JIS K 6253 durometer hardness. The value when measured according to the length test method is the hardness of the rubber.

  The needle insertion valve according to the present invention can be manufactured, for example, by molding a rubber composition capable of forming rubber into a predetermined shape. The rubber composition to be prepared contains a rubber precursor for forming rubber and various additives as required. Examples of the rubber precursor include known monomers that can form various rubbers. Examples of the silicone rubber precursor include polyorganosiloxane and polydimethylsiloxane.

  The prepared rubber composition is molded into a predetermined shape by various molding methods, for example. For example, injection molding using a mold, compression molding, or the like is preferably employed. In this way, the needle insertion valve can be manufactured. In addition, when a 2nd seal | sticker part is a slit, after shape | molding a rubber composition, a 2nd seal | sticker part can also be formed later using a cutter etc.

  The hollow ball according to the present invention includes the needle insertion valve according to the present invention. The hollow ball according to the present invention includes a spherical shell formed in a spherical shape, a valve mounting portion provided on the spherical shell, and a needle insertion valve mounted on the valve mounting portion. The spherical shell may have a single-layer structure or a multi-layer structure, and the layer structure is appropriately selected according to the use of the hollow ball. Examples of the layer constituting the multilayered spherical shell include a reinforcing layer that reinforces the strength of the spherical shell, and a skin layer. The valve mounting portion is provided inside the spherical shell by fitting or the like, and stores the needle insertion valve in its storage space. Therefore, the valve mounting portion is a tubular hollow housing. In this valve mounting portion, the storage space usually has a smaller radial dimension than the needle insertion valve, and the needle insertion valve is formed in the storage recess in a state compressed in the radial direction in the storage space. The needle insertion valve is stored in a state in which the collar portion is fitted. By being stored in the storage space in this manner, the needle insertion valve, particularly the second seal portion, maintains a high close state. The hollow ball according to the present invention can adopt a known configuration as appropriate except for the needle insertion valve according to the present invention, and the type of the hollow ball, for example, soccer ball, volleyball, basketball, handball, rugby ball, tennis Depending on the ball and the like, it is configured appropriately.

  Since the hollow ball according to the present invention includes the needle insertion valve according to the present invention, the injection needle can be easily inserted and removed, and air hardly leaks both when the injection needle is not inserted and when the injection needle is inserted. Therefore, according to the present invention, it is possible to achieve the object of providing a hollow ball in which air hardly leaks both when the injection needle is not inserted and when the injection needle is inserted.

  The needle insertion valve according to the present invention will be specifically described with reference to the drawings. As shown in FIG. 1, a needle insertion valve 1 which is an example of a needle insertion valve according to the present invention is made of rubber and has a tubular base body 7 and a flange 8 formed on the outer peripheral surface of the base body 7. is doing. The axial length of the needle insertion valve 1 can be the same length regardless of the type of the hollow ball, and is set to 17 to 18 mm, for example.

  As shown in FIG. 1, the base body 7 is connected to a cylindrical portion 7a having a constant outer diameter and an end portion of the cylindrical portion 7a, and the truncated cone portion 7b whose outer diameter gradually decreases in the extending direction. Further, a chamfered portion 7c is chamfered on the opposite side of the cylindrical portion 7a with respect to the truncated cone portion 7b. That is, the base body 7 is formed into a tubular body in which the truncated cone part 7b, the cylindrical part 7a, and the chamfered part 7c are continuously formed along the axial direction. The base body 7 has a circular cross section perpendicular to the axis. The base body 7 is adjusted to an appropriate outer diameter and axial length according to the type of hollow ball to which the needle insertion valve 1 is mounted, the air pressure filled in the internal space, and the like. The outer diameter of the substrate 7 can be the same regardless of the type of the hollow ball, and is set to, for example, 4 to 11 mm. The axial lengths of the cylindrical portion 7a, the truncated cone portion 7b, and the chamfered portion 7c are appropriately determined.

  As shown in FIG. 1, the base body 7 has a needle passage 11 that extends in the axial direction, and preferably extends in the axial direction so as to be coaxial with the axis. The needle passage 11 is opened when the injection needle is not inserted, and the first seal portion 12 that closes tightly to the outer periphery of the injection needle when the injection needle is inserted, and the injection needle is not inserted. It has the 2nd seal | sticker part 13 which closes | closes closely sometimes. Therefore, when the needle passage 11 is attached to the hollow ball, the inner space of the hollow ball and the outside of the hollow ball are hermetically sealed by at least the second seal portion 13 regardless of whether or not the injection needle is inserted. Block.

  As shown in FIG. 1, the first seal portion 12 is a bottomed hole having an annular inner surface 15 and a bottom portion 14 which are perforated along the axis of the base body 7 and are in close contact with the outer periphery of the inserted injection needle. ing. That is, the first seal portion 12 in the needle insertion valve 1 is a bottomed hole 12 that extends along the axial direction of the needle insertion valve 1. The bottomed hole 12 has a circular shape whose outline in a plane perpendicular to the axis is similar to the cross-sectional shape perpendicular to the axis of the injection needle, and is in close contact with the outer periphery of the injection needle. Thus, if the entire inner peripheral surface of the bottomed hole 12 is the inner surface 15, air leakage can be prevented to a high degree because the outer periphery of the injection needle is in close contact with high confidentiality.

  The bottomed hole 12 is opened with a gap in the radial direction of the needle passage 11 when the injection needle is not inserted. The gap distance of the gap, that is, the inner diameter of the inner surface 15 is more than 0 and smaller than the outer diameter of the injection needle, and the insertion / removability of the injection needle and prevention of air leakage can be achieved at a high level. It is preferably 50% or more and less than 100% with respect to the diameter, and particularly preferably 70 to 95%. Specifically, the gap distance is preferably 0.4 to 2.4 mm, and particularly preferably 0.6 to 2.2 mm. In the needle insertion valve 1, the bottomed hole 12 is formed up to the flange portion 8 to be described later, but the depth of the bottomed hole 12 is appropriately set according to the axial length of the base body 7, for example, 6 ˜9 mm. The bottom portion 14 of the bottomed hole 12 is formed in a substantially hemispherical shape so as to guide the injection needle to a second seal portion 13 described later.

  As shown in FIG. 1, the second seal portion 13 is preferably coaxial with the first seal portion 12 along the axial direction from the bottom portion 14 of the first seal portion 12 to the end surface of the chamfered portion 7c. Is formed. The second seal portion 13 is continuously provided in the bottomed hole 12 along the axial direction of the needle insertion valve 1, and is formed as a single-letter slit that closes and closes the inner surfaces when not inserted. Yes. The dimension of the slit 13 is preferably 120 to 200% with respect to the outer diameter of the injection needle, for example, from the viewpoint that both insertion / removability of the injection needle and prevention of air leakage can be achieved at a high level. 170% is particularly preferred. Specifically, this dimension is preferably 1.2 to 4 mm, and particularly preferably 1.5 to 3.5 mm.

  As shown in FIG. 1, the flange portion 8 is formed in an annular shape that swells radially from the outer peripheral surface of the base body 7 at the approximate center in the axial direction of the base body 7. The flange 8 functions to prevent the needle insertion valve 1 from easily falling off the hollow ball by fitting into the fitting recess of the mounting body provided in the hollow ball. Therefore, the formation position, the outer diameter, and the axial length of the collar portion 8 are set so as to fit the fitting recess. For example, the outer diameter of the collar portion 8 is 5 to 15 mm, and the axial length is 3 to 6 mm.

  The needle insertion valve 2 which is another example of the needle insertion valve according to the present invention is basically the same as the needle insertion valve 1 except that the needle passage 21 is different as shown in FIG. The needle passage 21 has the first seal portion 12, the second seal portion 13, and the lead-out hole 22 in this order along the insertion direction of the injection needle. The first seal portion 12 and the second seal portion 13 of the needle passage 21 are basically the same as the first seal portion 12 and the second seal portion 13 of the needle passage 11. As shown in FIG. 2, the lead-out hole 22 is a bottomed hole drilled on the most downstream side of the base body 7, and the bottom portion is connected to the second seal portion 13. Guide the derivation. The lead-out hole 22 has an outer diameter larger than the outer diameter of the injection needle and guides the injection needle. Therefore, the inner diameter of the outlet hole 22 only needs to be larger than the outer diameter of the injection needle, and is set to 101 to 300% with respect to the outer diameter of the injection needle, for example. The cross-sectional shape of the lead-out hole 22 perpendicular to the axis is not particularly limited, but considering the guide reliability of the injection needle, etc., it may be circular, elliptical or polygonal, and is similar to the cross-sectional shape of the injection needle Preferably, it is circular in this example. The bottom of the lead-out hole 22 is formed in a substantially hemispherical shape. The depth of the lead-out hole 22 is appropriately set according to the axial length of the base body 7 and is, for example, 1 to 5 mm.

  The needle insertion valve 3 which is another example of the needle insertion valve according to the present invention is basically the same as the needle insertion valve 1 except that the needle passage 31 is different as shown in FIG. The needle passage 31 includes a guide hole 35 drilled along the axis of the base body 7 and a second seal portion 13 provided continuously from the bottom 34 of the guide hole 35 in this order along the insertion direction of the injection needle. And has a first seal portion 32 formed on the inner surface of the guide hole 35 substantially in the axial direction. The second seal portion 13 of the needle passage 31 is basically the same as the second seal portion 13 of the needle passage 11.

  As shown in FIG. 3, the guide hole 35 is a bottomed hole having a bottom 34 that is drilled along the axis of the base 7 on the most upstream side of the base 7. The guide hole 35 has an outer diameter larger than the outer diameter of the injection needle and guides the injection needle. Therefore, the inner diameter of the guide hole 35 only needs to be larger than the outer diameter of the injection needle, and is set to 101 to 300% with respect to the outer diameter of the injection needle, for example. The cross-sectional shape perpendicular to the axis of the guide hole 35 is not particularly limited, but considering the guide reliability of the injection needle, etc., it may be circular, elliptical or polygonal, and is similar to the cross-sectional shape of the injection needle Preferably, it is circular in this example. The bottom portion 34 of the guide hole 35 is formed in a substantially hemispherical shape so as to guide the injection needle to the second seal portion 13. The depth of the guide hole 35 is appropriately set according to the axial length of the base body 7 and is, for example, 3 to 9 mm.

  As shown in FIG. 3, the first seal portion 32 is formed at a substantially central portion in the axial direction of the guide hole 35, protrudes toward the inside of the needle passage 31, that is, the guide hole 35, and the inner periphery of the guide hole 35. An annular body 32 that makes a round of the surface. The annular body 32 has an annular inner surface 33 (see FIG. 3B) that is in close contact with the outer periphery of the injection needle inserted through the guide hole 35. The inner surface 33 is basically the same as the inner surface 15 of the bottomed hole 12 except that the length in the axial direction is different, and is in close contact with the outer periphery of the injection needle. Therefore, the gap distance, that is, the inner diameter of the inner surface 33 exceeds 0 and is smaller than the outer diameter of the injection needle. The length of the inner surface 33 in the axial direction is appropriately set in consideration of insertion / removal properties of the injection needle and prevention of air leakage, for example, 1 to 5 mm.

  The needle insertion valve 4 which is still another example of the needle insertion valve according to the present invention is basically the same as the needle insertion valve 1 except that the needle passage 41 is different as shown in FIG. The needle passage 41 has a guide hole 44 for guiding the injection needle, a first seal portion 42, and a second seal portion 43 in this order along the insertion direction of the injection needle.

  As shown in FIG. 4, the guide hole 44 is drilled along the axis of the base 7 on the most upstream side of the base 7, and is formed in a tapered shape in which the inner diameter gradually decreases in the drilling direction. The needle is guided to the first seal portion 42. The opening diameter (maximum diameter) of the guide hole 44 opening in the base body 7 is larger than the outer diameter of the injection needle, and the minimum diameter of the guide hole 44 is the same as the inner diameter of the first seal portion 42 described later. The opening diameter of the guide hole 44 is set to 101 to 300% with respect to the outer diameter of the injection needle, for example. The cross-sectional shape perpendicular to the axis of the guide hole 44 is not particularly limited, but considering the guide reliability of the injection needle, etc., it may be circular, elliptical or polygonal, and is similar to the cross-sectional shape of the injection needle Preferably, it is circular in this example. The depth of the guide hole 44 is appropriately set according to the axial length of the base body 7 and is, for example, 1 to 5 mm.

  The first seal portion 42 is basically the same as the first seal portion 12 except that it is connected to the guide hole 44 and has a different axial length. The second seal portion 43 is basically the same as the second seal portion 13 except that it is a cross-shaped slit.

  A state when the injection needle is inserted into and removed from the needle insertion valve according to the present invention will be described in comparison with a conventional needle insertion valve. The injection needle N to be inserted into and removed from the needle insertion valve according to the present invention is a tubular body having an outer diameter larger than the inner diameter of the first seal portion of the needle insertion valve according to the present invention, and an air hole ( (Not shown).

  In order to insert the injection needle N through the needle insertion valve 1, the tip of the injection needle N is disposed opposite the opening of the first seal portion 12 and press-fitted into the needle insertion valve 1 side. When the injection needle N is press-fitted into the needle passage 11 in this way, the injection needle N sequentially enters the first seal portion 12 and the second seal portion 13 as shown in FIG. Further, the tip protrudes from the second seal portion 13 and reaches the internal space of the hollow ball. Thus, the injection needle N is inserted into the needle insertion valve 1, and the air discharged by a pump or the like (not shown) is supplied from the air hole of the injection needle N to the internal space of the hollow ball.

  In the insertion state of the injection needle N, the first seal portion 12 is expanded in diameter in the radial direction when the injection needle N enters, and a restoring force acts on the gap due to the elasticity of the rubber needle insertion valve 1. 5A, the inner surface 15 of the first seal portion 12 is in close contact with the outer periphery of the injection needle N. On the other hand, since the second seal portion 13 is a slit, when the injection needle N is inserted, the outer periphery of the injection needle N inserted through the second seal portion 13 and the second seal portion as shown in FIG. A gap G may be formed between the inner surface of 13. However, since the needle insertion valve 1 has the first seal portion 12, the first seal portion 12 that is in close contact with the outer periphery of the injection needle N allows communication between the internal space of the hollow ball and the outside of the hollow ball. Even if the gap G is formed in the second seal portion, the internal space of the hollow ball is closed. In this way, it is possible to prevent air filled in the internal space of the hollow ball from leaking out of the hollow ball when the injection needle N is inserted. In the present invention, when the needle insertion valve 1 is formed of silicone rubber, the frictional force between the needle passage 11 and the injection needle N is small, and there is an effect that the injection needle N can be smoothly inserted into the needle passage 11.

  When the injection needle N inserted through the needle passage 11 is removed, an operation reverse to the insertion of the injection needle N is performed. That is, the injection needle N inserted through the needle passage 11 is retracted in the reverse direction, that is, retracted from the needle insertion valve 1. Then, the injection needle N sequentially retreats from the second seal portion 13 and the first seal portion 12 and finally withdraws from the needle insertion valve 1. At this time, when the needle insertion valve 1 is formed of silicone rubber, there is an effect that the friction force between the needle passage 11 and the injection needle N is small and the injection needle N can be smoothly removed from the needle passage 11.

  In the process of removing the injection needle N, when the injection needle N is inserted through the second seal portion 13 even if a gap G is formed between the outer periphery of the injection needle N and the inner surface of the second seal portion 13. The injection needle N is always inserted through the first seal portion 12, and the first seal portion 12 is in close contact with the outer periphery of the injection needle N until the injection needle N is completely removed from the needle insertion valve 1. Therefore, it is possible to prevent the air filled in the inner space of the hollow ball from leaking out of the hollow ball in the process of removing the injection needle N.

  In order to insert the injection needle N through the needle insertion valve 2, the injection needle N is press-fitted into the needle passage 21 in the same manner as the needle insertion valve 1. When the injection needle N is press-fitted into the needle passage 21 in this way, the injection needle N sequentially enters the first seal portion 12, the second seal portion 13, and the outlet hole 22, as shown in FIG. Thus, the tip reaches the internal space of the hollow ball. In the inserted state of the injection needle N, the inner surface 15 of the first seal portion 12 is in close contact with the outer periphery of the injection needle N as shown in FIG. On the other hand, the inner surface of the lead-out hole 22 having an inner diameter larger than the outer diameter of the injection needle is not in close contact with the outer periphery of the injection needle N, and the second seal portion 13 has a gap G between the outer periphery of the injection needle N. Sometimes formed. However, in the needle insertion valve 2, communication between the inner space of the hollow ball and the outside of the hollow ball is blocked by the first seal portion 12, and the air filled in the inner space of the hollow ball is inserted into the hollow ball when the injection needle N is inserted. Can be prevented from leaking outside. In the present invention, when the needle insertion valve 2 is formed of silicone rubber, there is an effect that the friction force between the needle passage 12 and the injection needle N is small and the injection needle N can be smoothly inserted into the needle passage 12.

  In order to remove the injection needle N inserted through the needle passage 21, the injection needle N inserted through the needle passage 21 is retracted in the reverse direction in the same manner as the needle insertion valve 1. At this time, when the needle insertion valve 2 is formed of silicone rubber, the injection needle N can be smoothly removed from the needle passage 21. In the removal process of the injection needle N, the first seal portion 12 is in close contact with the outer periphery of the injection needle N until the injection needle N is completely removed from the needle insertion valve 1 in the same manner as the needle insertion valve 1. In the process of removing the injection needle N, like the needle insertion valve 1, it is possible to prevent the air filled in the internal space of the hollow ball from leaking out of the hollow ball.

  When the injection needle is not inserted into the needle insertion valves 1 and 2, the first seal portion 12 and the third seal portion 22 are open, but the second seal portion is closed, so that the hollow ball It is possible to prevent the air filled in the internal space from leaking out of the hollow ball.

  The needle insertion valves 3 and 4 are basically the same as the needle insertion valves 1 and 2 in preventing leakage of the air filled in the internal space of the hollow ball to the outside. However, the needle insertion valve 3 is different in that the inner surface 33 of the annular body 32 in which the guide hole 35 is formed is in close contact with the outer periphery of the injection needle N. Therefore, the needle insertion valve according to the present invention can prevent air leakage both when the injection needle is not inserted and when the injection needle is inserted.

  On the other hand, as shown in FIGS. 7A and 7B, the conventional needle insertion valve 50 includes a guide hole 52 having an inner diameter larger than the outer diameter of the injection needle, a slit 53, A needle passage 51 having a lead-out hole 54 having an inner diameter larger than the outer diameter of the injection needle in this order along the insertion direction of the injection needle is provided. The needle insertion valve 50 is formed to have an outer diameter that is basically the same as that of the needle insertion valve 1, that is, the needle insertion valve 50 includes the base body 7 and the flange portion 8. Therefore, when the injection needle N is inserted through the needle insertion valve 50, the inner surfaces of the guide hole 52 and the outlet hole 54 are not in close contact with the outer periphery of the injection needle N as shown in FIG. And a gap G may be formed between the inner surface of the single-letter slit 53. As described above, when the injection needle N is inserted, the needle insertion valve 50 does not seal the internal space of the hollow ball, and the air filled from the injection needle N into the internal space is filled with the slit 53 and the air is filled. It leaks from the gap G with the needle N. Therefore, the conventional needle insertion valve 50 is liable to cause air leakage particularly when the injection needle is inserted.

  The needle insertion valve according to the present invention is not limited to the above example, and various modifications can be made within a range in which the object of the present invention can be achieved. For example, each of the needle insertion valves 1 to 4 includes the base body 7 and the flange portion 8, but in this invention, the needle insertion valve may not include other fitting means instead of the flange portion. You may provide only a base | substrate.

  In the needle insertion valves 1, 2, and 4, the first seal portions 12 and 42 are formed in one bottomed hole. However, in the present invention, a plurality of first seal portions may be provided. For example, from the upstream side in the insertion direction of the injection needle N, two second holes including a seal hole that functions as a first seal portion, a continuous portion that has an increased inner diameter, and a bottomed hole that functions as a first seal portion One seal part can be mentioned.

  In the needle insertion valve 3, the needle passage 31 has one annular first seal portion 32 on the inner surface of the guide hole 35 substantially in the axial direction. May be formed on the inner surface of the guide hole, or may be formed on the inner surface of the guide hole other than the center in the axial direction.

  The hollow ball according to the present invention will be specifically described with reference to the drawings. As shown in FIG. 8, a hollow ball 70 which is an example of a hollow ball according to the present invention includes a spherical shell 71 formed in a spherical shape, a valve mounting portion 72 provided in the spherical shell 71, and the valve mounting. The needle insertion valve according to the present invention, for example, the needle insertion valve 1, mounted on the portion 72 is included. The spherical shell 71 has a three-layer structure including a base layer 71a, a reinforcing layer 71b, and a skin layer 71c. The base layer 71a is formed in a hollow shape with an air impermeable rubber such as butyl rubber. The reinforcing layer 71b is a layer formed by winding a fiber such as nylon on the outer peripheral surface of the base layer 71a, and the skin layer 71c is formed of natural leather or synthetic leather. The spherical shell 71 defines an internal space 73 filled with air. As shown in FIG. 8, the valve mounting portion 72 is a tubular hollow housing bonded to the inner side of the base layer 71 a, and the needle insertion valve 1 is fitted therein and the collar portion 8 is fitted into the fitting recess. Thus, a storage space 72a (see FIG. 8B) is stored that is compressed and stored in the radial direction.

  The hollow ball according to the present invention is not limited to the above example, and various modifications can be made within a range in which the object of the present invention can be achieved. For example, the spherical shell 71 has a three-layer structure including a base layer 71a, a reinforcing layer 71b, and a skin layer 71c. In this invention, the spherical shell has a single-layer structure, a two-layer structure, or a multilayer structure of four or more layers. You may have.

Example 1
A silicone rubber composition containing a silicone rubber precursor was injected into a mold capable of forming the needle passage 11 having the first seal portion 12 and molded at a molding temperature of 175 ° C. for 6 minutes. A one-letter-shaped slit 13 was formed in the formed body from the bottom 14 of the first seal portion 12 to the end surface of the chamfered portion 7c with a cutter having a blade width of 3 mm, and the needle insertion valve 1 shown in FIG. 1 was manufactured. The rubber hardness of the needle insertion valve 1 was 40 ° and had the following dimensions.
Needle insertion valve 1: Axis length 17.2mm
Cylindrical portion 7a: outer diameter 6 mm, axial length 7.0 mm
Frustum 7b: maximum outer diameter 6mm, minimum outer diameter 5.3mm, axis length 6.3mm
Chamfer 7c: minimum outer diameter 4.6mm, axial length 0.7mm
Ridge part 8: outer diameter 9.6 mm, axial length 3.2 mm
First seal portion 12: depth 7 mm, inner diameter 1.8 mm, curvature radius R 1.8 mm of the bottom portion 14
Second seal part 13: axial length 10.2 mm, slit width 3 mm

(Comparative Example 1)
The silicone rubber composition was poured into a mold capable of forming a needle passage 51 having a guide hole 52 and a lead-out hole 54 and molded at a molding temperature of 175 ° C. for 6 minutes. A one-piece slit 53 was formed from the guide hole 52 to the lead-out hole 54 with a cutter having a blade width of 3 mm in this molded body, and the conventional needle insertion valve 50 shown in FIG. 7 was manufactured. The rubber hardness of the needle insertion valve 50 was 40 ° and had the following dimensions.
Needle insertion valve 50: Axis length 17.2 mm
Cylindrical portion 7a: outer diameter 6 mm, axial length 7.0 mm
Frustum 7b: maximum outer diameter 6mm, minimum outer diameter 5.3mm, axis length 6.3mm
Chamfer 7c: minimum outer diameter 4.6mm, axial length 0.7mm
Ridge part 8: outer diameter 9.6 mm, axial length 3.2 mm
Guide hole 52: depth 1 mm, inner diameter 2.2 mm, curvature radius of bottom R1.8 mm
Slit 53: Axis length 9mm, slit width 3mm
Lead hole 54: depth 7.2mm, inner diameter 2.2mm, curvature radius R2.2mm at the bottom

(Air leak test)
Each of the needle insertion valve 1 and the needle insertion valve 50 was mounted on a volleyball (model number: MTV5SLEC No. 5) manufactured by Morten Co., Ltd., and the internal pressure inside the hollow was adjusted to 300 hPa. Thereafter, the needle insertion valve 1 and 50 mounted on the volleyball are inserted into the needle insertion valves 1 and 50 until the injection needle N (outer diameter 2.5 mm) completely penetrates, and then the injection needle N is completely removed from the needle insertion valve. The detachment operation was one cycle, and 50 cycles of insertion / removal operations were repeated. After 50 cycles of insertion and removal operations were completed, a “digital ball internal pressure gauge” (trade name “Digital Pressure Gauge”, manufactured by Molten Co., Ltd.) was inserted into the needle insertion valves 2 and 50 to measure the internal pressure of each hollow ball. . As a result, the internal pressure of the hollow ball with the needle insertion valve 1 was 270 to 280 hPa, whereas the internal pressure of the hollow ball with the needle insertion valve 50 was 100 hPa or less.

  Therefore, when the hollow ball shown in FIG. 8 without a needle insertion valve is prepared and the needle insertion valve 1 is attached to the valve attachment portion 72, air is injected both when the injection needle is not inserted and when it is inserted. Hollow balls that are difficult to leak can be manufactured.

1, 2, 3, 4 Needle insertion valve 7 Base 8 Eave 11, 11, 31, 41, Needle passage 12, 42 First seal (bottomed hole)
13, 43 Second seal part (slit)
14 bottom part 15 inner surface 22 lead-out hole 32 1st seal part (annular body)
33 inner surface 34 bottom 35 guide hole 44 guide hole 70 hollow ball 71 spherical shell 72 valve mounting part 73 internal space N injection needle G gap

Claims (8)

A rubber needle insertion valve extending in the axial direction and having a needle passage through which an injection needle for air injection is inserted,
The needle passage is opened when the injection needle is not inserted, and a first seal portion that closes tightly around an outer periphery of the injection needle when the injection needle is inserted, and the injection needle is inserted A needle insertion valve having a second seal portion that closes tightly when not in this order along the insertion direction of the injection needle.   The needle insertion valve according to claim 1, wherein the first seal portion has an inner surface having an inner diameter smaller than an outer diameter of the injection needle.   The needle insertion valve according to claim 1 or 2, wherein the first seal portion is a bottomed hole extending along the axial direction.   The needle insertion valve according to claim 1 or 2, wherein the first seal portion is at least one annular body projecting inward of the needle passage.   The needle insertion valve according to any one of claims 1 to 4, wherein the second seal portion is a slit.   The needle insertion valve according to any one of claims 1 to 5, wherein the second seal portion is connected to the first seal portion.   7. The guide hole according to claim 1, further comprising a guide hole that guides the injection needle to the first seal portion upstream of the first seal portion in the insertion direction. Needle insertion valve.   A hollow ball comprising the needle insertion valve according to claim 1.

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