JP2012247036A - Protective tube end cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective tube end cap adaptable to a double piping structure in which piping materials and wires with a variety of outer diameters are accommodated in a protective tube.SOLUTION: The protective tube end cap 10 is provided with a cover 1 that covers the tube end opening 20a of the protective tube 20 in which piping materials 21, 22 or wires 25 are accommodated, and a fixing part 2 capable of being fixed on the outer circumferential surface 20b of the end part of the protective tube 20, while being continuously provided to the cover 1. The protective tube end cap 10 has cylindrical parts 3, 4 projecting out from the cover 1, through which piping materials 21, 22 or wires 25 accommodated in the protective tube 20 can be inserted, with the cylindrical parts 3, 4 having portions becoming gradually or stepwisely narrower as they are located farther away from the cover 1.

Description

  The present invention relates to a protective tube terminal cap that is used by covering a terminal of a protective tube containing piping material or wiring.

  Resin piping materials are frequently used for the purpose of supplying and draining water to facilities such as water heaters and warm water floor heaters provided in buildings. Such a piping material may be used by being housed in a protective tube in order to prevent deterioration due to ultraviolet rays or damage due to contact with other members. The protective tube may contain a plurality of piping materials or a wiring. Hereinafter, a structure provided with piping materials or wiring and a protective tube for accommodating them is referred to as a double piping structure.

  In the case of a double piping structure, the piping material and wiring accommodated in the protective pipe are drawn out from the end of the protective pipe and are used by being connected to predetermined equipment. In addition, when pulling out piping materials and wiring from the end of the protective tube in this way, foreign matter such as dust, rainwater and insects can be prevented from entering the space between the protective tube and the piping material and wiring in the protective tube. For this purpose, the end of the protective tube may be covered with a cap. The cap used by covering the end of the protective tube in this way is sometimes called a protective tube end cap.

  An example of a conventional protective tube terminal cap is disclosed in Non-Patent Document 1, for example. The protective tube terminal cap disclosed in Non-Patent Document 1 is provided with two cylindrical portions through which the piping material accommodated in the protective tube can be inserted. One cylindrical portion through which the wiring accommodated in the protective tube can be inserted is also provided. In the conventional protective tube terminal cap as disclosed in Non-Patent Document 1, the inner diameter of each cylindrical portion is substantially the same as the outer diameter of the piping material or wiring inserted through the cylindrical portion. It is substantially constant over the entire length of the shape portion in the axial direction.

Further, Patent Document 1 includes a covering portion that covers the terminal opening of the protective tube, and an attachment portion that has a locking portion that locks the tube end peripheral wall portion of the protective tube and that is continuous with the covering portion. In addition, a protective tube terminal cap is disclosed in which the covering portion has a penetrating portion whose strength is weaker than other portions within a range corresponding to the outer diameter of the tube to be protected that is inserted into the protective tube. Patent Document 2 discloses a copolymer of ethylene and an α-olefin having 4 or more carbon atoms, having a melt flow rate of 0.1 to 95 g / 10 minutes and a density of 0.888 to 0.930 g / An end sealing cap of a plastic double pipe characterized by molding an ethylene / α-olefin copolymer having a cm ³ and a Q value (Mw / Mn) of less than 2.5 is disclosed. Further, Patent Document 3 includes an insertion hole for restricting movement in the radial direction through which wiring / piping material is inserted, and wiring / piping material drawn out from the insertion hole in which irregularities continuous in the axial direction are formed on the outer surface. A connection structure of a corrugated protective tube in which the corrugated protective tube is connected to a connector having a connection portion to which the corrugated protective tube to be housed and protected is connected. The corrugated protective tube that is fitted in a recess formed on the outer surface of the tube and restricts axial movement thereof and that is connected to the connection portion is in contact with the wiring / pipe material on the inner surface. Accordingly, there is disclosed a connection structure for a corrugated protective tube, in which the movement in the radial direction is restricted and the separation from the movement restricting protrusion is prevented.

JP-A-7-208683 Japanese Patent Laid-Open No. 9-137154 JP 2010-112511 A

Design Registration No. 996117

  As described above, the protective tube terminal cap is used for the purpose of preventing foreign matters such as dust, rainwater and insects from entering the space between the protective tube and the piping material and wiring in the protective tube. Therefore, it is preferable that the clearance gap formed between the piping material or wiring accommodated in a protective tube and the hole (cylindrical part) provided in the protective tube terminal cap in order to let them pass is small. Therefore, as described above, in the conventional protective tube terminal cap, the inner diameter of each tubular portion is formed to be substantially the same as the outer diameter of the piping material or wiring inserted through the tubular portion.

  However, there are pipes with various outer diameters accommodated in the protective pipe. Therefore, in the conventional protective tube terminal cap as disclosed in Non-Patent Document 1 and Patent Documents 1 to 3, the piping material accommodated in the protective tube and the protective tube terminal cap are inserted to allow the piping material to pass therethrough. In order to reduce the gap formed between the hole (cylindrical part) provided, there are various types depending on the outer diameter of the piping material accommodated in the protective tube and the combination of the piping material accommodated in the protective tube. It was necessary to prepare a protective tube terminal cap of a different form. That is, with the conventional protective tube terminal cap, it is necessary to produce many types of holes having different inner diameters of holes and cylindrical portions for inserting piping materials accommodated in the protective tube, which is costly. was there.

  This invention is made | formed in view of the said problem, and makes it a subject to provide the protective pipe terminal cap which can respond to the double piping structure by which piping materials and wiring of various outer diameters were accommodated in the protective pipe. .

  In order to solve the above problems, the present invention takes the following means.

  The present invention includes a covering portion that covers a terminal opening of a protective tube in which piping material or wiring is accommodated, a fixing portion that is provided continuously to the covering portion and can be fixed to the outer peripheral surface of the end portion of the protective tube, A protective tube terminal cap that includes a cylindrical portion that protrudes from the covering portion and can be inserted into the piping material or wiring accommodated in the protective tube, and the cylindrical portion is gradually separated from the covering portion. Or it is a protection tube terminal cap which has the part which becomes thin in steps.

  As described above, the cylindrical portion that can be inserted through the piping material or the wiring housed in the protective tube has a portion in which the inner diameter is not constant in the axial direction. If it cut | disconnects, the internal diameter of the cylindrical part in the cutting part can be made into an appropriate magnitude | size. That is, by cutting the cylindrical portion at an appropriate location, the piping material that allows the inner diameter of the portion having the smallest inner diameter in the cylindrical portion (hereinafter, also referred to as “minimum inner diameter”) to pass through the cylindrical portion. Or it can change according to the outer diameter of wiring. Therefore, when the pipe material or wiring having various outer diameters is inserted into the cylindrical part, the movement in the radial direction is suppressed, and the gap between the cylindrical part and the pipe material or wiring inserted through the cylindrical part. Can prevent foreign matter from entering the protective tube. Therefore, it can be set as the protection tube terminal cap which can respond to the double piping structure where the piping material and wiring of various outer diameters were accommodated in the protection tube. If the minimum inner diameter of the tubular portion and the outer diameter of the piping material or wiring inserted through the tubular portion are substantially equal without cutting the tubular portion, it is not necessary to cut the tubular portion.

  In the protective tube terminal cap of the present invention, it is preferable that the cylindrical portion protrudes from the covering portion to the side opposite to the fixed portion.

  As described above, the tubular portion is easily cut off at an appropriate location by adopting a configuration in which the tubular portion protrudes from the covering portion to the side opposite to the fixed portion. That is, it becomes easy to match the minimum inner diameter of the cylindrical portion with the outer diameter of the piping material or wiring inserted through the cylindrical portion. Therefore, it is possible to provide a protective tube terminal cap that can easily correspond to the double piping structure in which piping materials and wirings having various outer diameters are accommodated in the protective tube.

  The protective tube terminal cap of the present invention preferably includes a plurality of cylindrical portions.

  By adopting a configuration including a plurality of cylindrical portions, it is possible to cope with a double piping structure in which a plurality of piping materials or wirings are accommodated in a protective tube. When a plurality of cylindrical portions are provided, each cylindrical portion may have the same form, or may have a form in which the inner diameter and the axial length are appropriately changed.

  The protective tube terminal cap of the present invention further includes a bottomed cylindrical portion that protrudes from the covering portion, has an opening at the end on the covering portion side, and has a bottom portion on the other end side. It is preferable that the part can be inserted through the piping material or the wiring housed in the protective tube by cutting out the bottom.

  The conventional protective tube terminal cap needs to be configured differently depending on whether it is used for a double piping structure in which the wiring is accommodated in the protective tube or a double piping structure in which the wiring is not accommodated in the protective tube. was there. If a protective tube terminal cap of a form used for a protective tube containing wiring is used for a protective tube that does not contain wiring, foreign matter may enter the protective tube from a hole (cylindrical portion) through which the wiring is to be inserted. Because there is. According to the protective tube terminal cap of the present invention, the bottomed tube is used in the double pipe structure in which the wiring is accommodated in the protective tube by adopting the form having the bottomed cylindrical portion as described above. By cutting out the bottom of the shaped portion, the bottomed tubular portion can be made into a tubular shape and the wiring can be inserted therethrough. On the other hand, when using in a double pipe structure where no wiring is accommodated in the protective tube, foreign matter may enter the protective tube by using the bottomed cylindrical part without removing the bottom. Can be prevented. In this way, by using the above-mentioned bottomed cylindrical portion, it is possible to use the double pipe structure in which the wiring is accommodated in the protective pipe and the double pipe structure in which the wiring is not accommodated. This eliminates the need to change the form. In the above description, the bottomed cylindrical portion is compared with the case where it is used for a double piping structure in which wiring is accommodated in a protective tube and the case where it is used for a double piping structure in which wiring is not accommodated in the protective tube. However, for the same reason as described above, by providing a bottomed cylindrical portion, the form of the double pipe structure in which the number of pipe members accommodated in the protective pipe is different. It can be set as the protection tube terminal cap which can respond without changing. That is, it is possible to form a cylindrical portion through which the piping material is inserted by cutting off the bottom of the bottomed cylindrical portion in accordance with the number of piping materials accommodated in the protective tube.

  In the protective tube terminal cap of the present invention, when the bottomed cylindrical portion is provided, it is preferable that the bottomed cylindrical portion protrudes from the covering portion to the side opposite to the fixed portion.

  As described above, the bottomed cylindrical part protrudes from the covering part to the opposite side of the fixed part, so that the bottom part of the bottomed cylindrical part is cut off and the tubular material or wiring is inserted. It becomes easy to form the part.

  ADVANTAGE OF THE INVENTION According to this invention, the protective tube terminal cap which can respond to the double piping structure by which piping materials and wiring of various outer diameters were accommodated in the protective tube can be provided.

FIG. 1A is a front view schematically showing the protective tube terminal cap 10. FIG. 1B is a rear view schematically showing the protective tube terminal cap 10. FIG. 1C is a side view schematically showing the protective tube terminal cap 10. FIG. 2A is a plan view schematically showing the protective tube terminal cap 10. FIG. 2B is a bottom view schematically showing the protective tube terminal cap 10. Fig.3 (a) is a figure which shows schematically the cross section of the protective tube terminal cap 10 in IIIa-IIIa shown to Fig.2 (a). FIG.3 (b) is a figure which shows schematically the cross section of the protective tube terminal cap 10 in IIIb-IIIb shown to Fig.2 (a). It is a figure which shows the usage example of the protection tube terminal cap 10 roughly. FIG. 4A is a cross-sectional view corresponding to FIG. FIG. 4B is a cross-sectional view corresponding to FIG. It is a figure which shows schematically the other usage example of the protective tube terminal cap 10, and is sectional drawing corresponding to Fig.4 (a). It is a figure which shows the protective tube terminal cap 50 roughly, and is sectional drawing corresponding to Fig.3 (a). It is a figure which shows the protective tube terminal cap 60 schematically, and is sectional drawing corresponding to Fig.3 (a).

  The above-described operation and gain of the present invention will be clarified from embodiments for carrying out the invention described below. Hereinafter, the present invention will be described based on embodiments shown in the drawings. However, the present invention is not limited to these embodiments. In addition, each drawing is simplified as appropriate for convenience of illustration and ease of understanding. Moreover, in each drawing, the same code | symbol is attached | subjected to the thing of the same structure, and the code | symbol which becomes repeated may be abbreviate | omitted partially.

  FIG. 1A is a front view schematically showing the protective tube terminal cap 10. FIG. 1B is a rear view schematically showing the protective tube terminal cap 10. FIG. 1C is a side view schematically showing the protective tube terminal cap 10. In FIG. 1A, FIG. 1B, and FIG. 1C, the left-right direction is the axial direction of the cylindrical portions 3, 4. FIG. 2A is a plan view schematically showing the protective tube terminal cap 10. FIG. 2B is a bottom view schematically showing the protective tube terminal cap 10. In FIG. 2A and FIG. 2B, the back / front direction of the paper is the axial direction of the cylindrical portions 3 and 4. Fig.3 (a) is a figure which shows schematically the cross section of the protective tube terminal cap 10 in IIIa-IIIa shown to Fig.2 (a). FIG.3 (b) is a figure which shows schematically the cross section of the protective tube terminal cap 10 in IIIb-IIIb shown to Fig.2 (a).

  When the protective tube terminal cap 10 is attached to the protective tube, the protective tube terminal cap 10 is provided continuously with the covering portion 1 that covers the terminal opening of the protective tube and the covering portion 1. When the terminal cap 10 is attached to the protective tube, a fixing portion 2 that can be fixed to the outer peripheral surface of the end portion of the protective tube is provided. The protective tube terminal cap 10 includes cylindrical portions 3 and 4 and a bottomed cylindrical portion 5 that protrude from the covering portion 1.

  FIG. 4 schematically shows an example of use of the protective tube terminal cap 10. FIG. 4A is a cross-sectional view corresponding to FIG. FIG. 4B is a cross-sectional view corresponding to FIG.

  As shown in FIGS. 4A and 4B, the covering portion 1 is formed by the cylindrical portions 3 and 4 and the bottomed portion, which will be described in detail later, when the protective tube terminal cap 10 is attached to the protective tube 20. It is a part which covers the terminal opening part 20a of the protective tube 20, except the part in which the opening part of the cylindrical part 5 was formed. On the other hand, the fixing portion 2 is a portion that can be fixed to the outer peripheral surface 20 b at the end of the protective tube 20 when the protective tube terminal cap 10 is attached to the protective tube 20. Specifically, a plurality of protrusions 6, 6, 6 are formed on the inner peripheral surface side of the fixing part 2 over the entire periphery, and the fixing part 2 is utilized using the protrusions 6, 6, 6. Can be fixed to the outer peripheral surface 20 b at the end of the protective tube 20.

  Next, the cylindrical parts 3 and 4 will be described. The cylindrical portions 3 and 4 are portions through which the piping material or wiring accommodated in the protective tube can be inserted. As shown in FIG. 1 etc., the cylindrical parts 3 and 4 have a part which becomes thin in steps as it leaves | separates from the coating | coated part 1. As shown in FIG. More specifically, the cylindrical portion 3 is provided continuously to the covering portion 1, and is provided continuously to the first portion 3a having a substantially constant inner diameter in the axial direction and the first portion 3a. The inclined portion 3c has an inner diameter that gradually decreases as the distance from the first portion 3a increases, and the second portion 3b that is provided continuously to the inclined portion 3c and has a substantially constant inner diameter in the axial direction. ing. The second portion 3b has a smaller inner diameter than the first portion 3a. On the other hand, the cylindrical part 4 is provided continuously to the covering part 1 and has a first part 4a whose inner diameter is substantially constant in the axial direction, and the inner diameter gradually decreases as the distance from the first part 4a increases. And a second portion 4b provided continuously with the inclined portion 4c and having an inner diameter substantially constant in the axial direction. The second part 4b has a smaller inner diameter than the first part 4a.

  As described above, the cylindrical portions 3 and 4 have portions where the inner diameter is not constant in the axial direction. Therefore, if the cylindrical parts 3 and 4 are cut | disconnected in an appropriate location, the internal diameter of the cylindrical parts 3 and 4 in the cutting part can be made into an appropriate magnitude | size, and the minimum internal diameter of the cylindrical parts 3 and 4 is made. The outer diameter of the piping material or wiring to be inserted through the cylindrical portions 3 and 4 can be adjusted. That is, by cutting the cylindrical portions 3 and 4 at appropriate locations, the minimum inner diameter of the cylindrical portions 3 and 4 is changed in accordance with the outer diameter of the piping material or wiring inserted through the cylindrical portions 3 and 4. be able to. Therefore, it is possible to prevent the pipe members or wirings inserted through the cylindrical parts 3 and 4 from freely moving when the pipe members or wirings having various outer diameters are inserted. It is possible to prevent foreign matter from entering the protective tube through a gap between the pipe material or the wiring inserted into the shape portions 3 and 4. Therefore, the protective tube terminal cap 10 can correspond to a double piping structure in which piping materials or wirings having various outer diameters are accommodated in the protective tube.

  If the minimum inner diameter of the cylindrical portions 3 and 4 and the outer diameter of the piping material or wiring inserted into the cylindrical portions 3 and 4 are substantially equal without cutting the cylindrical portions 3 and 4, the cylindrical portions 3 and 4 There is no need to cut 4. For example, in the usage example of the protective tube terminal cap 10 shown in FIGS. 4A and 4B, the piping material 21 having an outer diameter substantially the same as the inner diameter of the second portion 3b of the cylindrical portion 3 is used. Since the pipe member 22 having an outer diameter substantially the same as the inner diameter of the second portion 4b of the cylindrical portion 4 is inserted into the cylindrical portion 4 through the cylindrical portion 3, the cylindrical portions 3 and 4 are We use as it is without cutting.

  On the other hand, when the piping material inserted into the cylindrical portions 3 and 4 is thicker than the second portions 3b and 4b, a part of the cylindrical portions 3 and 4 is cut, and the cylindrical portions 3 and 4 The inner diameter of 4 can be matched with the outer diameter of the piping material inserted through the cylindrical portions 3 and 4. FIG. 5 is a view schematically showing another example of use of the protective tube terminal cap 10, and is a cross-sectional view corresponding to FIG. Reference numerals 3 ′ and 4 ′ shown in FIG. 5 indicate cylindrical portions obtained by cutting part of the cylindrical portions 3 and 4, respectively. In the usage example shown in FIG. 5, a part of the cylindrical portions 3 and 4 is cut, and a pipe member 23 having an outer diameter substantially the same as the inner diameter of the first portion 3 a is inserted into the cylindrical portion 3 ′. A pipe member 24 having an outer diameter substantially the same as the inner diameter of the first portion 4a is inserted through the tubular portion 4 ′.

  As described above, according to the protective tube terminal cap 10, the inner diameters of the end portions of the cylindrical portions 3 and 4 are appropriately sized according to the outer diameter of the piping material or the wiring accommodated in the protective tube. Can do. Therefore, even if the outer diameters of the piping materials or wirings inserted into the cylindrical portions 3 and 4 are different, the cylindrical portions 3 and 4 and the cylindrical portion are prepared without preparing a protective tube terminal cap of another form. It is possible to reduce the gap formed between the piping material or the wiring inserted into 3 and 4 and prevent foreign matter from entering the protective tube.

  In the protective tube terminal cap 10, the axial length L1 (refer to FIG. 3A) of the first portions 3a and 4a of the cylindrical portions 3 and 4 and the axial length of the second portions 3b and 4b. The length L2 (see FIG. 3 (a)) is not particularly limited, but when the piping material or wiring is inserted through the cylindrical portions 3 and 4, it is possible to prevent the inserted piping material or wiring from freely moving. It is preferable that it is the length of. Moreover, when L1 and L2 are too long, handling of the protective tube terminal cap 10 becomes difficult. From these viewpoints, for example, L1 is preferably 5 mm to 40 mm, more preferably 10 mm to 30 mm, and still more preferably 15 mm to 25 mm. L2 is preferably 3 mm or more and 15 mm or less, more preferably 4 mm or more and 13 mm or less, and still more preferably 5 mm or more and 10 mm or less. Further, the inner diameter d1 (see FIG. 3 (a)) of the first portions 3a and 4a of the cylindrical portions 3 and 4 and the inner diameter d2 (see FIG. 3 (a)) of the second portions 3b and 4b are particularly limited. Instead, it can be appropriately changed according to the outer diameter of a piping material or the like that is supposed to be inserted into the cylindrical portions 3 and 4. For example, d1 and d2 are preferably +0.05 mm or more and +0.8 mm or less, more preferably +0.1 mm or more and +0.5 mm or less with respect to the outer diameter of the pipe material to be inserted, More preferably, it is set to +0.15 mm or more and +0.3 mm or less. By setting d1 and d2 in the above range, it becomes easy to insert piping materials and the like, and foreign matter enters the protective tube from between the cylindrical portion and the piping material inserted through the cylindrical portion. It becomes easy to prevent this.

  Next, the bottomed cylindrical portion 5 will be described. The protective tube terminal cap 10 includes a bottomed cylindrical portion 5 that protrudes from the covering portion 1 and has an opening 5a at an end portion on the covering portion 1 side and a bottom portion 5b at the other end side. By cutting out the bottom part 5b of the bottomed cylindrical part 5, a cylindrical part can be formed, and piping material or wiring can be inserted through the cylindrical part. For example, as shown in FIG. 4B, the bottom part 5b of the bottomed cylindrical part 5 is cut off to form a cylindrical part 5 ′, and the wiring 25 accommodated in the protective tube 20 is connected to the cylindrical part 5 ′. Can be inserted.

  According to the protection tube terminal cap 10, the bottom portion 5 b of the bottomed tubular portion 5 is provided by arranging the bottomed tubular portion 5 so that the wiring is accommodated in the protection tube to which the protection tube terminal cap 10 is attached. By cutting off and forming the cylindrical part 5 ′, the wiring can be inserted into the cylindrical part 5 ′. On the other hand, when wiring is not accommodated in the protective tube to which the protective tube terminal cap 10 is attached, by using the bottomed tubular portion 5 as it is without cutting the bottom portion 5b of the bottomed tubular portion 5 , Foreign matter can be prevented from entering the protective tube. As described above, according to the protective tube terminal cap 10, the configuration including the bottomed cylindrical portion 5 is used for the protective tube in which the wiring is accommodated and the protective tube in which the wiring is not accommodated. In some cases, it is not necessary to prepare a protective tube terminal cap separately.

  Further, if it is assumed that the piping material is inserted into the cylindrical portion 5 ′, even if the number of piping materials accommodated in the protective tube to which the protective tube terminal cap 10 is attached is different for the same reason as described above, the configuration is changed. The protective tube terminal cap 10 can be attached without being changed. That is, when the number of piping materials accommodated in the protective tube to which the protective tube terminal cap 10 is attached is two (pipe materials are inserted into the cylindrical portions 3 and 4 and the bottom portion 5b of the bottomed cylindrical portion 5 is not cut off. However, even in the case of three (pipe material is inserted through the cylindrical portions 3, 4, 5 ′), the protective tube terminal cap 10 can be attached.

  In the protective tube terminal cap 10, the length L3 in the axial direction of the bottomed cylindrical portion 5 (see FIG. 3B) is not particularly limited, but piping is provided to the cylindrical portion 5 ′ formed by cutting the bottom portion 5b. When the material or the wiring is inserted, it is preferable that the length is such that the inserted piping material or the wiring is prevented from freely moving. Moreover, when L3 is too long, handling of the protective tube terminal cap 10 becomes difficult. From these viewpoints, for example, L3 is preferably 10 mm or more and 40 mm or less, more preferably 12 mm or more and 30 mm or less, and further preferably 15 mm or more and 25 mm or less. Further, the inner diameter d3 (see FIG. 3B) of the bottomed cylindrical portion 5 is not particularly limited, and the outside of the wiring or the like assumed to be inserted into the cylindrical portion 5 ′ formed by cutting off the bottom portion 5b. Depending on the diameter, it can be appropriately changed.

  As described so far, according to the protective tube terminal cap 10, the pipe material and wiring of various outer diameters can be used without changing the form with respect to the double piping structure in which the protective tube is accommodated. Can do. Therefore, for example, when producing the protective tube terminal cap 10 using a mold, the types of molds to be used can be reduced. Therefore, the production cost of the protective tube terminal cap 10 can be suppressed. Further, by reducing the types of molds to be used, there is an advantage that a process for exchanging molds can be reduced during production. Furthermore, since the types of protective tube terminal caps 10 to be prepared can be reduced, inventory management becomes easy, and inventory maintenance and management costs can be reduced.

  Although the material which comprises the protective tube terminal cap 10 is not specifically limited, For example, it can comprise with polyolefin resin. Among these, a polyethylene resin is preferable, and a low density polyethylene resin is more preferable. Examples of commercially available low-density polyethylene resins include “Kernel” manufactured by Nippon Polyethylene Co., Ltd. and “Engage” manufactured by DuPont Dow Elastomers Co., Ltd.

  Moreover, although the manufacturing method of the protection tube terminal cap 10 is not specifically limited, For example, it can manufacture by injection molding. When manufacturing the protective tube terminal cap 10 by injection molding, a commercially available commercially available injection molding machine can be used. In this case, injection conditions such as injection temperature, injection pressure, cooling temperature, and cooling time can be appropriately adjusted within the range in which the raw material can be molded.

  The double piping structure to which the protective tube terminal cap 10 can be applied is not particularly limited. For example, it is applied to a double piping structure in which piping materials for supplying and draining water used in facilities such as hot water floor heating are accommodated in protective tubes. Can do. The piping material that performs water supply and drainage used in facilities such as warm water floor heating can be constituted by, for example, a polyolefin-based resin pipe. More specifically, it can be composed of a crosslinked polyethylene pipe, a polybutene pipe, a PE-RT pipe, an aluminum composite pipe in which an aluminum layer is sandwiched between polyethylene resins, and the like.

  In the description of the present invention so far, the protective tube terminal cap 10 in the form used for the double piping structure in which two piping members and one wiring are accommodated in the protective tube has been described as an example. That is, the pipe material can be inserted into the two cylindrical portions 3 and 4 respectively, and the wiring can be inserted into the cylindrical portion 5 ′ formed by cutting off the bottom portion 5 b of the single bottomed cylindrical portion 5. The protective tube terminal cap 10 has been mainly described. However, the protective tube terminal cap of the present invention is not limited to such a form. The protective tube terminal cap of the present invention protrudes from the covering portion that covers the terminal opening of the protective tube, can be inserted through the piping material or wiring accommodated in the protective tube, and is gradually or gradually thinned away from the covering portion. What is necessary is just to provide at least one cylindrical part which has the part which has become. The number of the cylindrical portions and the bottomed cylindrical portions provided in the protective tube terminal cap of the present invention can be appropriately changed according to the number of piping materials and wirings accommodated in the protective tube to which the protective tube terminal cap is attached. .

  In the description of the present invention so far, the embodiment in which the inner diameter (excluding the bottom portion 5b) of the bottomed cylindrical portion 5 is constant in the axial direction is illustrated and described. However, the present invention is limited to such a configuration. Not. The bottomed cylindrical part provided in the protective tube terminal cap of the present invention can also have a form in which the inner diameter is not constant, like the cylindrical part.

  In the description of the present invention so far, the embodiment in which the cylindrical portions 3 and 4 are gradually reduced as they are separated from the covering portion 1 has been described. However, the protective tube terminal cap of the present invention is provided. When the cylindrical portion is thinned in stages, the number of stages may be any number. Moreover, the cylindrical part with which the protection tube terminal cap of this invention is equipped can also be made into the form which becomes gradually thin as it leaves | separates from a coating | coated part.

  FIG. 6 is a view schematically showing the protective tube terminal cap 50 and is a cross-sectional view corresponding to FIG. The protective tube terminal cap 50 includes cylindrical portions 53 and 54 that are gradually narrowed away from the covering portion 1. If the said cylindrical parts 53 and 54 are cut | disconnected in a suitable location, the internal diameter of the cylindrical parts 53 and 54 in the cutting part can be adjusted to a suitable magnitude | size. Therefore, similarly to the protective tube terminal cap 10 described above, the protective tube terminal cap 50 can correspond to a double piping structure in which piping materials and wirings of various outer diameters are accommodated in the protective tube.

  In the description of the present invention so far, the tubular portions 3 and 4 and the bottomed tubular portion 5 have been described by way of example in which they protrude from the covering portion 1 to the side opposite to the fixed portion 2. The invention is not limited to such a form.

  FIG. 7 is a view schematically showing the protective tube terminal cap 60, and is a cross-sectional view corresponding to FIG. The protective tube terminal cap 60 includes cylindrical portions 63 and 64 formed so as to protrude from the covering portion 1 to the fixed portion 2 side. In the protective tube terminal cap 60, the cylindrical portions 63 and 64 can be the same as the cylindrical portions 3 and 4 provided in the protective tube terminal cap 10 described above, except that the protruding directions are different. Even if it is such a form, the internal diameter of the cylindrical parts 63 and 64 in the cutting part can be made into an appropriate magnitude | size by cut | disconnecting the cylindrical parts 63 and 64 in an appropriate location. Therefore, similarly to the protective tube terminal cap 10 described above, the protective tube terminal cap 60 can correspond to a double piping structure in which piping materials and wirings of various outer diameters are accommodated in the protective tube. In addition, although the bottomed cylindrical part is not illustrated in FIG. 7, the bottomed cylindrical part can also be configured to protrude from the covering part 1 to the fixed part 2 side. However, the configuration in which the cylindrical portion and the bottomed cylindrical portion protrude from the covering portion on the side opposite to the fixed portion is preferable because the cylindrical portion and the bottomed cylindrical portion are easily cut.

  Moreover, in the description of the present invention so far, the protective tube terminal cap 10 having a configuration including the fixing portion 2 having a substantially elliptical cross section has been described as an example. However, the protective tube terminal cap of the present invention is limited to such a configuration. It is not something. The shape of the fixing portion provided in the protective tube terminal cap of the present invention can be appropriately changed according to the shape of the protective tube to which the protective tube terminal cap of the present invention is attached. Therefore, the cross section of the fixing portion may be circular, for example.

  In the description of the present invention thus far, the fixing portion 2 is fixed to the outer peripheral surface 20 b of the end portion of the protective tube 20 using the projections 6, 6, 6 provided on the inner peripheral surface side of the fixing portion 2. Although the embodiment has been exemplified and described, the protective tube terminal cap of the present invention is not limited to such a configuration. Means for fixing the fixing portion provided in the protective tube terminal cap of the present invention to the outer peripheral surface of the end portion of the protective tube is not particularly limited. For example, a slip stopper is provided on the inner peripheral surface side of the fixing portion by a known method. Also good.

A piping material described below, a protective tube for housing the piping material, and a protective tube terminal cap were prepared.
Protective tube: A protective tube whose outer periphery of the terminal opening on the side where the protective tube terminal cap is attached is a substantially oval shape having a long outer diameter of 36.5 mm and a short outer diameter of 23.0 mm.
Piping material: piping material having an outer diameter of 10 mm and piping material having an outer diameter of 13 mm.
Protective tube end cap: The fixed portion fixed to the outer peripheral surface of the end portion of the protective tube was substantially elliptical with a long inner diameter of 37.5 mm and a short inner diameter of 23.7 mm. In order to fix the fixing portion to the outer peripheral surface of the end portion of the protective tube, three rows of protrusions formed over the entire circumference were provided on the inner peripheral surface side of the fixing portion so as to be aligned in the axial direction. The height of the protrusion was 0.5 mm. The cylindrical portion is configured such that the inner diameter gradually changes like the protective tube terminal cap 10, the inner diameter d1 (see FIG. 3A) on the covering portion side is 13.2 mm, and the inner diameter d2 on the other end side (FIG. 3). (See (a)) was 10.2 mm. The inner diameter d3 (see FIG. 3B) of the bottomed cylindrical portion was 5 mm. Moreover, the thickness of the cylindrical part was about 1 mm, and the thickness of the fixed part was about 1.5 mm.

  When inserting a piping material having an outer diameter of 13 mm through the cylindrical portion of the protective tube terminal cap, the cylindrical portion was cut at a location where the inner diameter was 13.2 mm, and the piping material was inserted into the cylindrical portion. On the other hand, when inserting the piping material having an outer diameter of 10 mm through the cylindrical portion of the protective tube terminal cap, the piping material was inserted into the cylindrical portion without cutting the cylindrical portion. Further, the bottom portion of the bottomed tubular portion was cut to form a tubular portion, and wiring was inserted into the tubular portion. As a result, a single type of protective tube can be used, regardless of whether it is attached to a double piping structure having piping materials having different outer diameters as described above, or when the wiring is accommodated in the protective tube. I was able to cope with the terminal cap.

DESCRIPTION OF SYMBOLS 1 Covering part 2 Fixing part 3 Cylindrical part 3 'Cylindrical part 4 Cylindrical part 4' Cylindrical part 5 Bottomed cylindrical part 5 'Cylindrical part 6 Protrusion part 10 Protective tube terminal cap 20 Protective tube 20a Terminal opening part 20b Outer peripheral surface 21, 22, 23, 24 Piping material 25 Wiring 50 Protective tube terminal cap 53, 54 Cylindrical portion 60 Protective tube terminal cap 63, 64 Cylindrical portion

Claims (5)

A protection provided with a covering portion that covers a terminal opening of a protective tube in which piping material or wiring is accommodated, and a fixing portion that is provided continuously with the covering portion and can be fixed to the outer peripheral surface of the end portion of the protective tube. A tube end cap,
It protrudes from the covering part and includes a tubular part into which the piping material or wiring accommodated in the protective tube can be inserted.
The said cylindrical part is a protective tube terminal cap which has a part which becomes thin gradually or in steps as it leaves | separates from the said coating | coated part.   The protective tube terminal cap according to claim 1, wherein the tubular portion protrudes from the covering portion to the side opposite to the fixing portion.   The protective tube terminal cap according to claim 1, comprising a plurality of the cylindrical portions. Furthermore, it has a bottomed cylindrical portion that protrudes from the covering portion, has an opening at the end on the covering portion side and has a bottom on the other end side,
The protective tube terminal according to any one of claims 1 to 3, wherein the bottomed cylindrical portion is capable of inserting the piping material or wiring accommodated in the protective tube by cutting the bottom portion. cap.   The protective tube terminal cap according to claim 4, wherein the bottomed cylindrical portion protrudes from the covering portion to the side opposite to the fixing portion.

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