JP2017055297A - Structure for fitting mobile phone antenna to iron lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile-phone antenna fitting structure for fitting a mobile phone antenna to an iron lid easily and firmly into an a through-hoole for antenna formed on the iron lid.SOLUTION: The structure includes: a through-hole 1 for antenna formed on an iron lid 3 of a manhole 2, and includes an inverse tapered step part 1a formed in an upper portion, a hollow shaft 4 which is inserted into the through-hole 1 and includes an inverse tapered engaging part 4c formed in an upper portion to be engaged with the step part 1a and a male screw 4d threaded in a lower portion; and fixing means 5 for fixing the shaft 4 inserted into the through-hole 1 to the iron lid 3. A recessed part 4a is formed on an upper surface of the shaft 4. A mobile phone antenna 8 is housed in the recessed part 4a. A transmission cable 13 to be connected through the shaft 4 to a monitoring device installed in the manhole 2 is connected to the antenna 8. After the shaft 4 is inserted into the through-hole 1, the antenna 8 is fitted to the iron lid 3 together with the shaft 4 by the fixing means 5.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna mounting structure for an iron lid, and more particularly, to an antenna mounting structure for a mobile phone to an iron lid that can be easily and firmly attached to an antenna-dedicated through hole formed in the iron lid. It is.

  For example, as a method of detecting gas leaks from buried gas pipelines, a monitoring device is installed in the manhole, and a gas detection signal from the monitoring device is transmitted from an antenna attached to the manhole's iron cover, and this gas detection signal is transmitted. There was a method of receiving at a monitoring station. Note that the iron cover includes an iron cover that is installed in a hole other than the manhole, for example, a hand hole that a person in the field of communication power cannot enter.

  According to this method, it is possible to remotely detect gas leakage from the buried gas pipeline. At this time, the antenna attached to the iron cover of the manhole is connected to the iron cover because of the vehicle passing over the iron cover. It is necessary to attach it firmly.

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

  FIG. 12 is a cross-sectional view showing a conventional mounting structure.

  As shown in FIG. 12, in the conventional mounting structure, a taper-shaped base portion 24 is fitted into an air hole 23 formed in advance in the iron lid 22 of the manhole 21. The base portion 24 is made of an insulating material having flexibility and has a downwardly tapered shape, and its maximum diameter is slightly larger than the diameter of the air hole 23. An antenna 26 covered with an insulator 25 is attached to the upper surface of the base portion 24. A transmission cable 28 covered with a protective cover 27 is connected to the antenna 26, and the transmission cable 28 passes through the base portion 24 and connects a connector 29 to a monitoring device (not shown) installed in the manhole 21. Connected through.

  Since the maximum diameter of the base portion 24 is slightly larger than the diameter of the air hole 23, the antenna 26 can be connected to the manhole 21 by inserting the base portion 24 into the air hole 23 against the elastic force. It is attached to the iron lid 22.

JP 2008-109556 A

  According to the conventional attachment structure, the antenna 26 can be attached to the iron lid 22 of the manhole 21 relatively easily, but there are the following problems.

(1) Although the base portion 24 is supported by a support portion 30 that is in close contact with the lower surface of the iron lid 22, the support portion 30 is only pressure-bonded to the lower surface of the iron lid 22 with a magnet or the like. As a result, the antenna 26 is pushed together with the base portion 24 from the specified position to the air hole 23 at the lower portion, so that the antenna 26 has its function. There was a possibility that it could not be fully demonstrated.
(2) The problem of (1) above is caused by the base portion 24 being formed in a tapered shape, which makes it difficult to fix the base portion 24 at a specified position of the air hole 23. Moreover, once it is necessary to move the position of the base portion 24 upward after the base portion 24 is pushed into the air hole 23, the base portion 24 is removed from the lower portion of the air hole 23 and reinserted. Therefore, it takes time to insert the base portion 24.
(3) When the base portion 24 is pushed into the air hole 23 intentionally or by passing a vehicle or the like, the base portion 24 may fall out of the air hole 23.
(4) The larger the size of the antenna 26, the higher the performance. Therefore, the larger one is preferable, but the diameter of the existing air hole 23 is 12 mm to 20 mm as described in Patent Document 1. Therefore, of course, the size of the antenna 26 must be set to this level.

  Therefore, the object of the present invention is to push the shaft inserted into the through hole by forming a new through hole exclusively for the antenna having a step portion that is larger than the diameter of the air hole in the iron cover of the manhole. Even if force is applied, there is no risk that the antenna will be pushed into the through-hole more than necessary or fall out of the through-hole, and an antenna having an excellent function can be easily and firmly attached to the iron lid. An object is to provide a structure for mounting an antenna to a lid.

  The present invention has been made to achieve the above object, and is characterized by the following.

  According to the first aspect of the present invention, there is provided a through hole dedicated to an antenna having a step portion on an upper portion formed on an iron lid installed on a road surface, and the step portion on the upper portion being inserted into the through hole. A hollow shaft having a mating engagement portion and a male screw cut in the lower portion, and a fixing means for fixing the shaft inserted into the through hole to the iron lid, A concave portion is formed, and a mobile phone antenna is accommodated in the concave portion, and a transmission cable connected to a monitoring device installed in the manhole through the shaft is connected to the antenna, and the shaft After the antenna is inserted into the through hole, the antenna is attached to the iron lid together with the shaft by the fixing means.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the fixing means comprises a washer and a nut screwed into the male screw.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein both the step portion of the through hole and the engaging portion of the shaft are formed in a tapered shape. It has the characteristics.

  The invention according to claim 4 is the invention according to claim 1 or 2, wherein the step portion of the through hole is formed in a step shape, and the engagement portion of the shaft is formed in a flange shape. It has a feature in being.

  The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the through hole is newly formed in the existing iron lid.

  The invention described in claim 6 is characterized in that, in the invention described in any one of claims 1 to 5, the shaft is made of metal.

  According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, the antenna is covered with a protective cover, and the recessed portion is filled with a filler. It has characteristics.

  The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein an opening is formed in a side portion of the shaft, and the transmission cable extends from the opening to the outside of the shaft. It is characterized by being in

  The invention according to claim 9 is the invention according to claim 8, wherein the shaft has a length such that a lower end of the shaft protrudes from a lower surface of a reinforcing rib formed on a back surface of the iron lid. It has a special feature.

  The invention described in claim 10 is characterized in that, in the invention described in any one of claims 1 to 9, the iron lid is installed in a manhole.

  According to this invention, a through hole dedicated to an antenna having a step portion that is larger than the diameter of the air hole is formed in an iron cover installed on a road surface, for example, an iron cover of a manhole, and the step is formed above the step. A hollow shaft that has an engagement portion that engages with a portion and that has a male screw cut in a lower portion and that accommodates an antenna, is inserted into the through hole, and the shaft is inserted into a washer and a nut that is screwed into the male screw. By fixing to the iron lid by the fixing means, even if a pressing force acts on the shaft, there is no possibility that the shaft is pushed more than necessary into the through hole or falls out of the through hole.

  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.

  According to the present invention, the antenna covered with the protective cover and connected to the transmission cable is accommodated in the recess formed on the upper surface of the shaft, and the filler is filled in the recess so that the antenna is Since it is unitized, the antenna can be easily attached or replaced.

  Further, according to the present invention, when the iron lid is placed on the ground by forming an opening in a side portion of the shaft and taking the transmission cable out of the shaft from the opening, the transmission cable is connected to the lower surface of the shaft. It is possible to avoid being sandwiched between the ground and being damaged by the weight of the iron lid.

  Also, according to the present invention, when the iron lid is placed on the ground, an opening is formed in the side portion of the shaft, and the lower end of the shaft is projected from the lower surface of the reinforcing rib formed on the back surface of the iron lid. The transmission cable is sandwiched between the lower surface of the reinforcing rib of the iron cover and the ground, and can be prevented from being damaged by its own weight.

It is sectional drawing which shows the attachment structure of the antenna for mobile phones to an iron cover of this invention. It is sectional drawing which shows the through-hole formed in the iron cover. It is sectional drawing which shows the shaft in which the antenna was accommodated. It is sectional drawing which shows another attachment structure of the antenna to this invention iron cover. It is sectional drawing which shows another through-hole formed in the iron cover. It is sectional drawing which shows another attachment structure of the antenna to an iron cover of this invention. It is sectional drawing which shows the damage cause of a transmission cable. It is sectional drawing which shows the state which put the iron lid which attached the nut to the lower end of the shaft on the ground. It is sectional drawing which shows the avoidance means of the damage of a transmission cable. It is sectional drawing which shows another avoidance means of the damage of a transmission cable. It is sectional drawing which shows another avoidance means of the damage of a transmission cable. It is sectional drawing which shows the conventional attachment structure.

  Next, an embodiment of the structure for attaching an antenna for a mobile phone to an iron cover according to the present invention will be described with reference to the drawings.

  Here, the iron lid includes an iron lid installed in a hand hole or the like in the field of communication power that cannot be entered by a person other than the manhole iron lid. Therefore, although all the iron lids installed on the road surface are included, the iron lid of a manhole will be described below as an example.

  FIG. 1 is a cross-sectional view showing a structure for mounting an antenna to an iron cover according to the present invention, FIG. 2 is a cross-sectional view showing a through hole formed in the iron cover, and FIG. 3 shows a shaft in which the antenna is accommodated. It is sectional drawing.

  In FIG. 1 to FIG. 3, reference numeral 1 denotes a through hole formed in the iron lid 3 of the manhole 2, which is a dedicated through hole for the cellular phone antenna 8 described later. The through-hole 1 is formed with a stepped portion 1a having a taper-like shape at the top. An engaging portion 4c of the hollow shaft 4 described later is engaged with the step portion 1a.

  Reference numeral 4 denotes a metal hollow shaft inserted into the through hole 1. A concave portion 4 a is formed on the upper surface of the shaft 4, an insertion hole 4 b through which a transmission cable described later is inserted is formed in the center portion of the shaft 4, and a step portion of the through hole 1 is formed on the upper portion of the shaft 4. An engaging portion 4c having a lower taper shape that engages with 1a is formed, and a male screw 4d into which a nut 7 described later is screwed is cut at the lower portion of the shaft 4.

  Reference numeral 5 denotes fixing means for fixing the shaft 4 inserted into the through hole 1 to the iron lid 3. The fixing means 5 includes a washer 6 and a nut 7 that is screwed into the male screw 4 b of the shaft 4.

  Reference numeral 8 denotes an antenna made of a flat substrate housed in the recessed portion 4 a of the shaft 4. The antenna 8 is covered with a protective cover 10 bonded to the inner surface of the recessed portion 4a with an adhesive 9, and the recessed portion 4a is filled with a filler 11. A transmission cable 13 is connected to the antenna 8 through the insertion hole 4 b of the shaft 4 and connected to a monitoring device (not shown) installed in the manhole 2 via a connector 12.

  Thus, since the antenna 8 is accommodated in the shaft 4 and unitized, the antenna can be easily attached or replaced.

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

  A dedicated through hole 1 for the antenna 8 is formed in the iron lid 3. The diameter of the through hole 1 is larger than the air hole (see FIG. 7) of the existing iron lid. As a result, a high-performance antenna having a large area can be attached to the iron lid.

  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 4c of the shaft 4 engages with the step portion 1a of the through hole 1, the shaft 4 is always inserted into the specified position. As a result, there is no possibility that the shaft 4 will be pushed into the through-hole 1 more than necessary due to running of the vehicle or intentionally, so that the antenna 8 can sufficiently perform 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, the shaft 4 that requires a predetermined length is fixed to the iron lid 3 so as to accommodate the antenna 8 even if the thickness of the iron lid 3 is thin. be able to.

  In this way, the antenna 8 can be easily and firmly attached to the iron lid 3.

  Next, another structure for attaching the antenna to the iron cover according to the present invention will be described with reference to the drawings.

  FIG. 4 is a cross-sectional view showing another structure for attaching an antenna to an iron cover according to the present invention, and FIG. 5 is a cross-sectional view showing another through-hole formed in the iron cover.

  4 and 5, the same reference numerals as those in FIGS. 1 and 2 denote the same components.

  The difference between the different mounting structure shown in FIGS. 4 and 5 and the mounting structure shown in FIGS. 1 and 2 is that, in the different mounting structure, the step portion 1a of the through hole 1 is formed in a step shape. The engaging portion 4c of the shaft 4 is formed in a flange shape, and the portion of the shaft 4 where the male screw 4d is formed and the portion where the recessed portion 4a is formed have the same thickness. It is. In the mounting structure shown in FIGS. 1 and 2, the portion of the shaft 4 where the male screw 4d is formed is thinner than the portion where the recessed portion 4a is formed.

  FIG. 6 is a cross-sectional view showing still another structure for attaching an antenna to an iron lid according to the present invention.

  In FIG. 6, the same reference numerals as those in FIGS. 1 and 2 denote the same components.

  The difference between the further mounting structure shown in FIG. 6 and the mounting structure shown in FIGS. 1 and 2 is that, in the still another mounting structure, the step portion 1a of the through-hole 1 is formed in a step shape, and the shaft The engaging part 4c of 4 is a point formed in the flange shape.

  In any of the above mounting structures, there is no possibility that the antenna 8 is pushed into the through hole 1 more than necessary or falls out of the through hole 1, and the antenna 8 having an excellent function can be easily and firmly attached to the iron lid 3. Can be attached.

  Any of the above mounting structures has the following problems.

  As shown in FIG. 7, when the lower end of the shaft 4 protrudes from the lower surface of the reinforcing rib 14 formed on the back surface of the iron lid 3, the transmission cable 13 is connected when the iron lid 3 is placed on the ground (GL). The transmission cable 13 may be damaged by the weight of the iron lid 3 by being sandwiched between the lower surface of the shaft 4 and the ground.

  Even when the lower end of the shaft 4 does not protrude from the lower surface of the reinforcing rib 14 formed on the back surface of the iron lid 3, the transmission cable 13 of the reinforcing rib 14 is placed when the iron lid 3 is placed on the ground. There is a possibility that the transmission cable 13 is damaged by the weight of the iron lid 3 between the lower surface and the ground.

  In order to solve these problems, as shown in FIG. 9, an opening 4 e is formed in the side portion of the shaft 4 by cutting a groove in the longitudinal direction of the shaft 4, and the length of the shaft 4 is changed to the lower end of the shaft 4. Is a length protruding from the lower surface of the reinforcing rib 14 formed on the back surface of the iron lid 3, and the transmission cable 13 may be brought out of the shaft 4 through the opening 4 e. A nut 15 is screwed into the lower end of the shaft 4 to close the opening 4e.

  In this way, when the iron lid 3 is placed on the ground, as shown in FIG. 8, the nut 15 comes into contact with the ground and the transmission cable 13 comes out of the shaft 4 from the opening 4e. 13 is sandwiched between the lower surface of the shaft 4 or the lower surface of the reinforcing rib 14 of the iron cover 3 and the ground, and the possibility that the transmission cable 13 is damaged by the weight of the iron cover 3 can be avoided.

  As another means, as shown in FIG. 10, an opening 4 e may be formed in the shaft 4 by winding a binding band 16 around the portion of the shaft 4 where the groove is formed.

  As another means, as shown in FIG. 11, the elbow pipe 17 may be connected to the lower end of the shaft 4 and the flexible pipe 18 may be connected to the elbow pipe 17 without forming the opening 4 e in the shaft 4.

  In any of the above means, the transmission cable 13 is sandwiched between the lower surface of the shaft 4 or the lower surface of the reinforcing rib 14 of the iron lid 3 and the ground, and the transmission cable 13 avoids the possibility of damage due to its own weight. Can do.

  As described above, according to the present invention, the through hole 1 dedicated to the antenna having a step portion 1a larger than the diameter of the air hole is newly formed in the iron lid 3 of the manhole 2, and the step portion is formed on the upper portion. A hollow shaft 4 having an engaging portion 4c that engages 1a and having a male screw 4d cut at the lower portion and containing an antenna 8 is inserted into the through hole 1, and the shaft 4 is screwed with a washer 6, a male screw 4d, and the like. Even if a pressing force acts on the shaft 4 by fixing to the iron lid 3 by the fixing means 5 including the nut 7 to be joined, the shaft 4 is pushed more than necessary into the through hole 1 or from the through hole 1. There is no risk of falling out.

  In addition, according to the present invention, the high-performance antenna 8 can be attached to the iron lid 3 by newly forming the through hole 1 dedicated to the antenna in the iron lid 3.

  Further, according to the present invention, the antenna 8 covered with the protective cover 10 and connected to the transmission cable 13 is accommodated in the recessed portion 4a formed on the upper surface of the shaft 4, and the filler 11 is accommodated in the recessed portion 4a. Since the antenna 8 is unitized, the antenna 8 can be easily attached or replaced.

  In addition, according to the present invention, the opening 4e is formed in the side portion of the shaft 4, and the transmission cable 13 is taken out of the shaft 4 from the opening 4e. Is sandwiched between the lower surface of the shaft 4 and the ground, and it can be avoided that the iron lid 3 is damaged by its own weight.

  In addition, according to the present invention, the opening 4e is formed in the side portion of the shaft 4, and the lower end of the shaft 4 is projected from the lower surface of the reinforcing rib 14 formed on the back surface of the iron lid 3, so that the iron lid 3 is grounded. It is possible to avoid the transmission cable 13 being sandwiched between the lower surface of the reinforcing rib 14 of the iron cover 3 and the ground when the cable is placed on the iron cover 3 and being damaged by its own weight.

DESCRIPTION OF SYMBOLS 1: Through-hole 1a: Step part 2: Manhole 3: Iron cover 4: Shaft 4a: Recessed part 4b: Insertion hole 4c: Engagement part 4d: Male screw 4e: Opening 5: Fixing means 6: Washer 7: Nut 8: Antenna 9: Adhesive 10: Protective cover 11: Filler 12: Connector 13: Transmission cable 14: Reinforcement rib 15: Nut 16: Cable tie 17: Elbow pipe 18: Flexible pipe 21: Manhole 22: Iron cover 23: Air hole 24 : Base part 25: Insulator 26: Antenna 27: Protective cover 28: Transmission cable 29: Connector 30: Support part

Claims (10)

  A through hole dedicated to an antenna having a stepped portion on the upper portion formed on an iron lid installed on the road surface, and an engaging portion that is inserted into the through hole and engages with the stepped portion on the upper portion, A hollow shaft having a male screw cut at a lower portion thereof, and fixing means for fixing the shaft inserted into the through hole to the iron lid. A concave portion is formed on an upper surface of the shaft, and the inside of the concave portion is The mobile phone antenna is housed, and the antenna is connected to a transmission cable connected to a monitoring device installed in the manhole through the shaft, and after inserting the shaft into the through hole, A structure for mounting an antenna for a mobile phone to an iron lid, wherein the antenna is attached to the iron lid together with the shaft by the fixing means.   2. The structure for mounting an antenna for a mobile phone to an iron cover according to claim 1, wherein the fixing means comprises a washer and a nut screwed into the male screw.   The mobile phone to an iron cover according to claim 1 or 2, wherein both the step portion of the through hole and the engaging portion of the shaft are formed in a tapered shape. Antenna mounting structure.   The said step part of the said through-hole is formed in step shape, and the said engaging part of the said shaft is formed in flange shape, The iron lid of Claim 1 or 2 characterized by the above-mentioned. Mounting structure for mobile phone antenna.   The structure for mounting an antenna for a mobile phone 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 structure for mounting an antenna for a mobile phone to an iron cover according to any one of claims 1 to 5, wherein the shaft is made of metal.   The mobile phone for an iron cover according to any one of claims 1 to 6, wherein the antenna is covered with a protective cover, and the recessed portion is filled with a filler. Antenna mounting structure.   The iron according to any one of claims 1 to 7, wherein an opening is formed in a side portion of the shaft, and the transmission cable protrudes from the opening to the outside of the shaft. Mounting structure of mobile phone antenna to the lid.   The mobile phone according to claim 8, wherein the shaft has a length such that a lower end of the shaft protrudes from a lower surface of a reinforcing rib formed on a back surface of the iron lid. Phone antenna mounting structure.   The structure for mounting an antenna for a mobile phone to an iron cover according to any one of claims 1 to 9, wherein the iron cover is installed in a manhole.

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