JP2019083399A - Mounting structure of antenna to iron lid - Google Patents

Abstract

To provide a mounting structure of an antenna to an iron lid, in which a mobile phone antenna can easily and firmly be attached to a through hole dedicated to the antenna formed in the iron lid.SOLUTION: The mounting structure of an antenna to an iron lid includes: an antenna-specific through hole 1 formed on an iron lid 3 of a manhole 2 and having a lower thin tapered step 1a at a top; and a lower thin tapered engaging portion 4c, inserted into the through hole 1, engaged with the step 1a at the top, and is composed of a shaft 4 having an external thread 4d at its lower part and an opening 4e at its side; and fixing means 5 including a washer 6 and a nut 7 for fixing the shaft 4 inserted in the through hole 1 to the iron lid 3. A recessed portion 4a is formed on an upper surface of the shaft 4. An external communication antenna 8 is accommodated in the recessed portion 4a. The antenna 8 is connected to a transmission cable 13 connected to a monitoring device installed in the manhole 2 through the shaft 4. The washer 6 is formed with a mounting port 6a communicating with the opening 4e. A protective pipe 9 of a transmission cable 12 is attached to the mounting port 6a.SELECTED DRAWING: Figure 1

Description

  The present invention can attach the antenna to the iron lid, particularly, the antenna can be easily and firmly attached to the through hole dedicated to the antenna for the mobile phone formed on the iron lid, and can be formed on the shaft. It is possible to prevent the intrusion of foreign matter and rain water from the opening and to prevent the damage of the transmission cable, and there is a risk that the male screw of the shaft may be damaged by the impact when the iron lid is placed on the ground. The present invention also relates to the mounting structure of the antenna on the iron cover, which can easily be tightened with a nut for fixing the washer.

  For example, as a method of detecting a gas leak from a buried gas pipeline, a monitoring device is installed in a manhole, and a gas detection signal from the monitoring device is transmitted from an antenna attached to the iron cover of the manhole. There was a method to receive at the monitoring office etc. The iron lid also includes, for example, an iron lid installed in a hand hole which can not be inserted by a person in the communication power field.

  According to this method, it is possible to remotely detect the gas leak from the buried gas pipeline, but at this time, the antenna attached to the iron cover of the manhole is an iron cover in relation to vehicles passing over the iron cover. Need to be firmly attached to the

  An example of the attachment structure of the antenna to the iron lid is disclosed in Patent Document 1. Hereinafter, the mounting structure of the antenna to the iron lid is referred to as a conventional antenna mounting structure and will be described with reference to the drawings.

  FIG. 16 is a cross-sectional view showing a conventional antenna mounting structure.

  As shown in FIG. 16, the conventional antenna mounting structure is formed in the iron lid 22 of the manhole 21 and is inserted into the through hole 24 for the antenna dedicated with the step 23 at the top and inserted into the through hole 24. It has an engaging portion 25 engaged with the step portion 23 and is composed of a shaft 27 having a male screw 26 cut at its lower portion, and a fixing means 28 for fixing the shaft 27 inserted into the through hole 24 to the iron lid 22. ing.

  A recess 29 is formed on the upper surface of the shaft 27. An antenna 30 for a mobile phone is accommodated in the recess 29. A monitoring device (not shown) is installed in the manhole 21 through the shaft 27 in the antenna 30. After the transmission cable 31 connected to (not shown) is connected and the shaft 27 is inserted into the through hole 24, the antenna 30 is attached to the iron lid 22 together with the fixing means 28 by the fixing means 28. The fixing means 28 comprises a washer 32 and a nut 33 screwed with the external thread 26 of the shaft 27.

  An opening 34 is formed on the side of the shaft 27 by cutting a groove along the longitudinal direction of the shaft 27. The length of the shaft 27 is such that the lower end of the shaft 27 protrudes from the lower surface of the reinforcing rib 22 a formed on the back surface of the iron lid 22, whereby the transmission cable 31 extends from the opening 34 to the outside of the shaft 27. Exposed. A cap nut 35 is screwed into the lower end of the shaft 27 so that the opening 34 is closed.

  Since it is comprised as mentioned above, when the iron cover 22 is put on the ground (GL), as shown in FIG. 16, the cap nut 35 contact | abuts on the ground (GL), and the transmission cable 31 is the opening 34. Since the transmission cable 31 is exposed to the outside of the shaft 27, the transmission cable 31 is sandwiched between the lower surface of the shaft 27 or the lower surface of the reinforcing rib 22a of the iron lid 22 and the ground (GL). The risk of damage can be avoided.

Unexamined-Japanese-Patent No. 2017-55297

  As described above, according to the conventional attachment structure, the through hole 24 for the antenna dedicated to the antenna lid having the step portion 23 larger than the diameter of the air hole is newly formed in the iron lid 22 of the manhole 21. Even if a pressing force is applied to the shaft 27 inserted into the housing 24, there is no risk of the shaft 27 being pushed into the through hole 24 more than necessary or falling off the through hole 24, and the antenna 30 having an excellent function. Can be attached to the iron lid 22 easily and firmly, and the length of the shaft 27 is set such that the lower end of the shaft 27 protrudes from the lower surface of the reinforcing rib 22 a formed on the back surface of the iron lid 22. When the iron lid 22 is placed on the ground (GL) by forming an opening 34 through which the transmission cable 31 is inserted on the side of the 27 is sandwiched between the lower surface and the ground (GL) of the reinforcing rib 22a of the lower surface or Tetsufuta 22, it is possible to avoid that the transmission cable 31 may be damaged by the weight of Tetsufuta 22.

However, the conventional mounting structure has the following problems.
(1) Since the transmission cable 31 is exposed directly from the opening 34 formed in the side portion of the shaft 27, the transmission cable 31 may be damaged.
(2) Foreign matter, rain water and the like easily enter the shaft 27 from the opening 34.
(3) Since the impact when the iron lid 22 is placed on the ground (GL) is easily transmitted to the cap nut 35, there is a risk of damaging the male screw 26 of the shaft 27.
(4) Since the nut 33 for fixing the washer 32 is close to the back surface of the iron lid 22, the operation of tightening the nut 33 is difficult. In particular, when the reinforcing rib 22a is formed at a position approaching the nut 33, the tightening operation of the nut 33 is difficult to perform.

  Therefore, the object of the present invention is that there is no risk that the shaft is pushed more than necessary into the through hole or dropped out of the through hole, even if a pressing force is applied to the shaft inserted into the through hole. The mobile phone antenna having the function can be easily and firmly attached to the iron cover, and when the iron cover is placed on the ground, the transmission cable is between the lower surface of the shaft or the lower surface of the reinforcing rib of the iron cover and the ground. It is possible to prevent the transmission cable from being damaged by the weight of the iron cap being pinched in between, and to prevent the intrusion of foreign matter, rain water, etc. from the opening formed in the shaft. Damage can be prevented, and there is no risk of damage to the external thread of the shaft due to the impact when the iron lid is placed on the ground, and the tightening of the nut for fixing the washer is also possible. It allows the easy, is to provide a mounting structure of a cellular phone antenna to the iron lid.

  This invention was made in order to achieve the said objective, and is characterized by the following.

  The invention according to claim 1 is characterized in that a through hole dedicated to an external communication antenna having a step in the upper part formed in an iron lid installed on a road surface and inserted into the through hole, the above step And an externally threaded shaft at a lower portion thereof, and fixing means for fixing the shaft inserted into the through hole to the iron lid, the fixing means comprising: The shaft comprises a washer and a nut screwed with the male screw, the lower end of the shaft has a length projecting from the lower surface of a reinforcing rib formed on the back surface of the iron lid, and a recessed portion is formed on the upper surface An insertion hole is formed in the lower portion of the recessed portion, an opening communicating with the insertion hole is formed in a side portion of the shaft, the antenna is accommodated in the recessed portion, and the antenna is , Transmission connected to the monitoring device installed in the manhole The washer is formed with a mounting port communicating with the opening, a protective pipe of the transmission cable is mounted to the mounting port, and the transmission cable is inserted after the shaft is inserted into the through hole Is connected to the monitoring device together with the protective tube through the insertion hole, the opening and the attachment port, and the antenna is attached to the iron lid together with the shaft by the fixing means. It is a thing.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the antenna is a mobile phone antenna.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the stepped portion of the through hole and the engagement portion of the shaft are both formed in a lower taper shape. It is characterized by

  The invention according to claim 4 is the invention according to claim 1 or 2, wherein the stepped portion of the through hole is formed in a step shape, and the engagement portion of the shaft is formed in a flange shape. Have characteristics.

  The invention according to a fifth aspect is characterized in that, in the invention according to any one of the first to fourth aspects, the through hole is newly formed in the existing iron lid.

  The invention according to claim 6 is characterized in that, in the invention according to any one of claims 1 to 4, the through hole is formed in a manufacturing process of the iron lid.

  The invention described in claim 7 is characterized in that, in the invention described in any one of claims 1 to 6, the shaft is made of metal.

  According to an eighth aspect of the invention, in the invention according to any one of the first to seventh aspects, the antenna is covered by a protective cover, and the recess is filled with a filler. It has a feature.

  The invention according to a ninth aspect is characterized in that, in the invention according to any one of the first to eighth aspects, the iron lid is installed in a manhole.

  According to the present invention, an iron lid installed on a road surface, for example, an iron lid of a manhole, is newly formed with a through hole dedicated to a mobile phone antenna, for example, having a step larger than the diameter of the air hole. And inserting an engaging portion at the upper part and an externally threaded screw at the lower part into the through hole and inserting the shaft in which the antenna is accommodated, and screwing the shaft into the washer and the external thread By fixing to the iron lid by the fixing means comprising the nut, even if the pressing force acts on the shaft, there is no possibility that the shaft is pushed into the through hole more than necessary or dropped from the through hole.

  Further, according to the present invention, the transmission cable is exposed between the shaft, the washer and the protective tube by forming the mounting port on the washer, attaching the protective pipe to the mounting port, and passing the transmission cable through the protective pipe. As it is possible to prevent the intrusion of foreign matter, rain water and the like from the opening of the shaft, damage to the transmission cable can be prevented. In addition, when the iron cover is placed on the ground, the transmission cable is pinched between the lower surface of the shaft or the lower surface of the reinforcing rib of the iron cover and the ground, and damage by the weight of the iron cover can be avoided.

  Further, according to the present invention, since it is not necessary to screw the cap nut into the lower end of the shaft, the number of parts is small, and there is no possibility that the male screw of the shaft is damaged by the impact when the iron cover is placed on the ground.

  Further, according to the present invention, since the position of the nut for fixing the washer is separated from the back surface of the iron lid, the tightening operation of the nut is easy.

  Further, according to the present invention, a high performance antenna can be attached to the iron lid by newly forming a through hole dedicated to the antenna in the iron lid.

  Further, according to the present invention, an antenna connected to a transmission cable and covered by a protective cover is accommodated in a recess formed on the upper surface of the shaft, and the antenna is filled by filling the recess with a filler. As it is unitized, the antenna can be easily attached and replaced.

It is sectional drawing which shows the attachment structure of the antenna to an iron lid of this invention. It is a front view which shows the washer of the attachment structure of the antenna to an iron lid of this invention. It is a top view which shows the washer of the attachment structure of the antenna to an iron lid of this invention. It is a bottom view which shows the washer of the attachment structure of the antenna to an iron lid of this invention. It is a right view which shows the washer of the attachment structure of the antenna to an iron lid of this invention. It is a left view which shows the washer of the attachment structure of the antenna to an iron lid of this invention. It is the AA cross section of FIG. It is the BB cross section of FIG. It is a front view which shows the shaft of the attachment structure of the antenna to an iron lid of this invention. It is a top view which shows the shaft of the attachment structure of the antenna to an iron lid of this invention. It is a bottom view which shows the shaft of the attachment structure of the antenna to an iron lid of this invention. It is a right view which shows the shaft of the attachment structure of the antenna to an iron lid of this invention. It is a left view which shows the shaft of the attachment structure of the antenna to an iron cover of this invention. It is the CC cross section of FIG. It is sectional drawing which shows the other attachment structure of the antenna to an iron lid of this invention. It is sectional drawing which shows the conventional antenna attachment structure.

  Next, one embodiment of the mounting structure of the antenna to the iron lid of the present invention will be described with reference to the drawings.

  Here, the iron lid includes, in addition to the manhole iron lid, an iron lid installed in a hand hole or the like of the communication power field where people can not enter. Therefore, although all the iron lids installed on the road surface are included, hereinafter, an iron lid of a manhole will be described as an example.

  FIG. 1 is a cross-sectional view showing the mounting structure of the antenna to the iron lid of the present invention, FIG. 2 is a front view showing the washer of the mounting structure of the antenna to the iron lid of the present invention, and FIG. 4 is a plan view showing the washer of the mounting structure of the antenna to the iron lid, FIG. 4 is a bottom view showing the washer of the mounting structure of the antenna to the iron lid of the present invention, and FIG. Fig. 6 is a right side view showing the washer of the mounting structure of the antenna on the right side, Fig. 6 is a left side view showing the washer of the mounting structure of the antenna on the iron lid of the present invention, Fig. 7 is a cross section along line A-A in Fig. 2 8 is a sectional view taken along the line B-B in FIG. 6, FIG. 9 is a front view showing a shaft of the mounting structure of the antenna to the iron lid of the present invention, and FIG. 10 is an antenna to the iron lid of the present invention. 11 is a plan view of the shaft of the mounting structure of the antenna according to the present invention, FIG. 12 is a right side view showing the shaft of the mounting structure of the antenna to the iron lid of the present invention, and FIG. 13 is the left side showing the shaft of the mounting structure of the antenna to the iron lid of the present invention. FIG. 14 is a cross-sectional view taken along line A-A of FIG.

  1 to 14, reference numeral 1 denotes a through hole formed in the iron lid 3 of the manhole 2, and a dedicated through hole of an external communication antenna 8 such as a cellular phone antenna described later. In the through hole 1, a lower tapered tapered step 1 a is formed at the top. An engaging portion 4c of a shaft 4 described later engages with the step 1a.

  Reference numeral 4 denotes a metal shaft inserted into the through hole 1 as shown in FIGS. 9 to 14. A recess 4 a is formed on the upper surface of the shaft 4, and an insertion hole 4 b through which a transmission cable 12 to be described later is inserted is formed in the center of the shaft 4. A lower thin tapered engaging portion 4c is formed to engage with the portion 1a, and an external thread 4d is formed in the lower portion of the shaft 4 to be engaged with a nut 7 described later. The shaft 4 has a length projecting from the lower surface of a reinforcing rib (not shown, refer to FIG. 16, hereinafter the same) on the lower surface of the shaft 4 at the lower surface of the iron lid 3. The opening 4e through which the transmission cable 12 is inserted is formed.

  Reference numeral 5 denotes a fixing means for fixing the shaft 4 inserted into the through hole 1 to the iron lid 3. The fixing means 5 comprises a washer 6 and a nut 7 screwed with the external thread 4 d of the shaft 4. As shown in FIGS. 2 to 8, the washer 6 is formed with a mounting port 6a communicating with the opening 4e of the shaft 4, and the protective pipe 9 of the transmission cable 12 is mounted on the mounting port 6a via the mounting screw 13. It is attached. Since the washer 6 is made longer by providing the mounting opening 6a in the washer 6, the position of the nut 7 is separated from the back surface of the iron cover 3 by that amount, so that the nut 7 can be easily tightened.

  Reference numeral 8 denotes a mobile phone antenna, for example, as an antenna for external communication, which is formed of a flat substrate accommodated in the recess 4 a of the shaft 4. The antenna 8 is covered with a protective cover 10 adhered to the inner surface of the recess 4 a by an adhesive, and the recess 11 a is filled with a filler 11. A transmission cable 12 connected to a monitoring device (not shown) installed in the manhole 2 through a connector (not shown) is connected to the antenna 8 through the insertion hole 4b of the shaft 4 .

  As described above, since the antenna 8 is housed in the shaft 4 and unitized, mounting and replacement of the antenna can be easily performed.

  According to the attachment structure of the antenna to the iron lid of the present invention, the antenna 8 is attached to the iron lid 3 as follows.

  First, a dedicated through hole 1 of the antenna 8 is formed in the iron lid 3. The diameter of the through hole 1 is larger than the air hole of the existing iron lid. As a result, the large-area, high-performance antenna 8 can be attached to the iron lid.

  If the iron lid has already been installed, the through hole 1 is formed as described above with a drilling tool or the like, but in the case of a new iron lid, the through hole 1 is formed in advance in the manufacturing process. It may be In this way, when the iron lid is brought to the site, the parts are already attached, and the task of attaching the parts at the site becomes unnecessary.

  Next, the unitized antenna 8 housed in the shaft 4 is inserted into the through hole 1 of the iron lid 3 together with the shaft 4. At this time, since the engaging portion 4 c of the shaft 4 engages with the step 1 a of the through hole 1, the shaft 4 is always inserted at the prescribed position. As a result, there is no risk that the shaft 4 will be pushed more than necessary into the through hole 1 as the vehicle travels or purposely, the antenna 8 can fully exhibit its function.

  Next, after the washer 6 is inserted into the shaft 4, the nut 7 is screwed into the male screw 4 d of the shaft 4. Thereby, the shaft 4 in which the antenna 8 is accommodated is firmly fixed to the iron lid 3. By fixing the shaft 4 with the nut 7 via the washer 6, even if the thickness of the iron lid 3 is thin, the shaft 4 requiring a predetermined length is fixed to the iron lid 3 in a relationship to accommodate the antenna 8. be able to. At this time, the protective cable 9 is attached to the mounting port 6a of the washer 6 by the mounting screw 13 and the transmission cable 12 is passed through the protective pipe 9 from the opening 4e of the shaft 4 through the communicating port 6a. Since it is not exposed to the outside, damage to the transmission cable 12 can be prevented. Moreover, since the opening 4e is formed on the side of the shaft 4, the transmission cable 12 is taken out from the side of the washer 6 together with the protective tube 9, so that when the iron lid 3 is placed on the ground, the transmission cable 12 is sandwiched between the lower surface of the shaft 4 or the lower surface of the reinforcing rib 3a of the iron lid 3 and the ground, and damage by the weight of the iron lid 3 can be avoided.

  Thus, the antenna 8 can be easily and firmly attached to the iron lid 3.

  In the above example, the through hole 1 is formed at the upper part thereof in the upper and lower tapered steps 1a, but as shown in FIG. 15, the step 1a of the through hole 1 is formed in a step shape. The four engaging portions 4c may be formed in a flange shape.

  As described above, according to the present invention, the iron cover 3 installed on the road surface, for example, the iron cover 3 of the manhole 2, has a step portion 1a larger than the diameter of the air hole, for example, a mobile phone The through hole 1 dedicated to the antenna is newly formed, and the engaging portion 4c at the upper portion is engaged with the step portion 1a, and the male screw 4d is cut at the lower portion. 1 by inserting the shaft 4 into the iron lid 3 by fixing the shaft 4 to the iron lid 3 by the fixing means 5 consisting of the washer 6 and the nut 7 screwing with the male screw 4 d, the shaft 4 There is no risk of being pushed into the through hole 1 more than necessary or falling off the through hole 1.

  Further, according to the present invention, the mounting port 6 a is formed in the washer 6, the protective pipe 9 is mounted in the mounting port 6 a, and the transmission cable 12 is passed through the protective pipe 9. Since the transmission cable is not exposed in the period of time to the above, it is possible to prevent the intrusion of foreign matter, rain water and the like from the opening 4 e of the shaft 4 and to prevent the transmission cable 12 from being damaged. Moreover, when the iron cover 3 is placed on the ground, the transmission cable 12 is sandwiched between the lower surface of the shaft 4 or the lower surface of the reinforcing rib of the iron cover 3 and the ground, thereby avoiding damage by the iron cover 3 itself. can do.

  Further, according to the present invention, since it is not necessary to screw the cap nut 35 (see FIG. 16) to the lower end of the shaft 4, the number of parts is small and the shaft 4 is shocked when the iron lid 3 is placed on the ground. There is no risk of damage to the male screw 4d of.

  Further, according to the present invention, since the position of the nut 7 for fixing the washer 6 is separated from the back surface of the iron lid 3, the tightening operation of the nut 7 can be easily performed.

  Further, according to the present invention, the antenna 8 having high performance can be attached to the iron lid 3 by newly forming the through hole 1 exclusively for the antenna in the iron lid 3.

  Further, according to the present invention, the antenna 8 which is covered by the protective cover 10 and to which the transmission cable 12 is connected is accommodated in the concave portion 4a formed on the upper surface of the shaft 4, and the filler 11 is accommodated in the concave portion 4a. Since the antenna 8 is made into a unit by filling, the mounting and replacement of the antenna 8 can be easily performed.

1: through hole 1a: step 2: manhole 3: iron lid 4: shaft 4a: recess 4b: insertion hole 4c: engagement portion 4d: male screw 4e: opening 5: fixing means 6: washer 6a: mounting port 7: Nut 8: Antenna 9: Protective tube 10: Protective cover 11: Filler 12: Transmission cable 21: Manhole 22: Iron lid 22a: Reinforcement rib 23: Step 24: Through hole 25: Engage portion 26: Male thread 27: Shaft 28: Fixing means 29: Concave portion 30: Antenna 31: Transmission cable 32: Washer 33: Nut 34: Opening 35: Bag nut

Claims (9)

  A through hole dedicated to an external communication antenna having a stepped portion in the upper portion formed on an iron lid installed on a road surface, and an engaging portion inserted in the through hole and engaged with the stepped portion in the upper portion And a fixing means for fixing the shaft inserted into the through hole to the iron lid, the fixing means screwing with a washer and the male screw. The shaft has a length such that the lower end protrudes from the lower surface of the reinforcing rib formed on the back surface of the iron lid, and the shaft has a recessed portion formed on the upper surface, and the lower portion of the recessed portion An insertion hole is formed, an opening communicating with the insertion hole is formed in a side portion of the shaft, the antenna is accommodated in the recessed portion, and a monitoring device installed in a manhole in the antenna A transmission cable connected to the The gold is formed with an attachment port communicating with the opening, a protective pipe of the transmission cable is attached to the attachment port, and the transmission cable is inserted into the insertion hole after the shaft is inserted into the through hole, The exterior to the iron lid is characterized in that it is connected to the monitoring device together with the protective tube through the opening and the attachment opening, and the antenna is attached to the iron lid with the shaft by the fixing means. Communication antenna mounting structure.   The mounting structure of an antenna for external communication on an iron lid according to claim 1, wherein the antenna is a mobile phone antenna.   The external communication to the iron cover according to claim 1 or 2, characterized in that the stepped portion of the through hole and the engaging portion of the shaft are both formed in a lower taper shape. Antenna mounting structure.   The iron lid according to claim 1 or 2, wherein the stepped portion of the through hole is formed in a step shape, and the engagement portion of the shaft is formed in a flange shape. Mounting structure of antenna for external communication.   The attachment structure of an antenna for external communication to an iron lid according to any one of claims 1 to 4, wherein the through hole is newly formed in the existing iron lid.   The attachment structure of an antenna for external communication to an iron lid according to any one of claims 1 to 4, wherein the through hole is formed in a manufacturing process of the iron lid.   The mounting structure of an antenna for external communication on an iron lid according to any one of claims 1 to 6, wherein the shaft is made of metal.   The antenna according to any one of claims 1 to 7, wherein the antenna is covered by a protective cover, and the recess is filled with a filler. Antenna mounting structure.   The attachment structure of an antenna for external communication to an iron lid according to any one of claims 1 to 8, wherein the iron lid is installed in a manhole.

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