JP3224674B2 - Vehicle entry detection sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed contact sensor suitable for use in, for example, a toll collection system on a highway.

[0002]

2. Description of the Related Art Toll booths are provided at interchanges on expressways. This toll collection system is being automated. For example, as shown in FIG. 6, a closed contact sensor 1 for detecting the approach direction of a vehicle, a vehicle separator 2 for separating the vehicle and detecting passage, and a height of the vehicle It consists of a vehicle height detector 3 to be measured, and the output from these detectors is
It is processed in the toll machine room 5 via the lane control device 4, and is managed entirely by the management office 6.

FIG. 7 shows a closed contact sensor 1 having a cable 12 at one end in a soft elastic box-shaped closed container. FIG. 8 is a partial view showing the cable 12. FIG. 9 is a cross-sectional view of the closed contact sensor 1.
The strip-shaped upper metal thin plate 7 and lower metal thin plate 8 face up and down with a small space therebetween, and the gaps 10 are held at regular intervals by insulating plates 9 provided in both longitudinal directions of the metal thin plate. In addition, one end of the thin metal plate
3 is provided to the outside via a cable 12 to form an electric circuit.

As shown in FIG. 9, the closed contact sensor 1 is installed with its surface exposed on the road 11, and when the vehicle passes, the upper and lower metal sheets 7 to 8 are pressed by the tires. The contacts come into contact and become electrically closed circuits. Since the pressing of the tire sequentially moves to the adjacent metal thin plates 7 to 8 as the vehicle passes, the traveling direction and passage of the vehicle can be confirmed.

[0005]

As described above, since the conventional closed contact sensor is a closed container using a soft elastic material, the closed container and the metal thin plate are affected by a change in outside air temperature. Expands and contracts, and the contact distance between the upper metal sheet 7 and the lower metal sheet 8 changes, so that there is a problem that the operation load changes.

Further, there is another problem that the internal pressure fluctuates due to a temperature change due to complete sealing. The present invention has been made in view of the above circumstances, and allows only gas to pass therethrough without allowing moisture to pass therethrough, thereby preventing fluctuations in the internal pressure and operation load of a closed contact sensor and preventing corrosion of a thin metal plate. An object of the present invention is to provide a closed contact sensor.

[0007]

SUMMARY OF THE INVENTION A closed contact sensor according to the present invention is vertically opposed to each other at a predetermined interval, and comes into contact with each other when a pressing force is applied from an upper surface thereof to be in a conductive state. A thin plate, a horizontally long box-shaped closed container of a soft elastic body that holds a plurality of sets of this pair of strip-shaped metal sheets at predetermined intervals and holds them in a fixed position, and one end is individually connected to the strip-shaped metal sheet, and the other end is A cable having a plurality of signal lines led out of the horizontally long closed container, a cable having a breathing function for flowing gas inside the horizontally long closed container, I do.

Further, in the closed contact sensor according to the present invention, the respiratory function is a continuous porous tube penetrating the cable in the axial direction, and a thread laminated and sealed in the axial direction around the continuous porous tube. And characterized in that:

Further, the closed contact sensor according to the present invention is characterized in that the respiratory function is provided by providing a disc-shaped continuous porous sheet in the middle of a soft elastic tube penetrating in the cable in the axial direction. And

[0010]

According to the closed contact sensor having the above-mentioned structure, FIG.
As shown in FIG. 3 to FIG. 3, the opening of one end of the continuous porous tube 15 is placed near the band-shaped thin metal plate 7, extends through the center of the cable 12 through the resin 14 to the tip, and the tip is ventilated. The stopper 17 is closed with a non-conductive rubber or the like.
Further, a yarn 16 having the periphery of the continuous porous tube 15 laminated and adhered in the axial direction is attached to the tip.

Now, when the temperature of the closed contact sensor 1 rises and the internal pressure increases, the gas inside the continuous porous tube 1 has the property of permeating only gas without allowing moisture to pass through.
5, through the cable 12 in the radial direction,
The cable 12 passes through the gap of the yarn 16
Released from the tip.

When the temperature is lowered and the pressure is reduced, the outside air is absorbed contrary to the above case, but only the dry gas flows in because the continuous porous tube 15 does not allow moisture to pass therethrough. As another example, as shown in FIG. 4 and FIG. 5, instead of the continuous porous tube 15, the inside of the cable 12 is extended to the distal end by a tube 18b made of a resin or the like, and is opened. The continuous porous sheet 19 is sandwiched.

Although the gas flows through the continuous porous sheet 19, as described above, since the moisture cannot pass through, only the dry gas flows in, the pressure in the closed contact sensor is stabilized, and the strip-shaped metal sheet is corroded. Nothing.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a part of a closed contact sensor according to a first embodiment of the present invention, FIGS. 2 and 3 are cross-sectional views showing the same embodiment, and FIGS. 4 and 5 are second embodiments. It is sectional drawing which shows an example.

As shown in FIG. 9, an upper metal thin plate 7 and a lower metal thin plate 8 are provided on both sides of the closed contact sensor 1 with an insulating plate 9 interposed therebetween at regular intervals of, for example, about 0.3 mm to 0.4 mm. Is held including the longitudinal direction.

In this embodiment, four sets are arranged, and one end is connected to a lead wire 13, respectively, and is wired to the external lane control device 4 by a cable 12 as shown in FIG.
The continuous porous tube 15 shown in FIG. 2 extends from the inside of the closed contact sensor 1 to the tip through the center of the cable 12, and the tip is provided with a stopper 17 so that gas does not flow.

Further, the yarn 16 is laminated and adhered to the periphery of the continuous porous tube 15 in the longitudinal direction up to the end of the cable 12. In this state, for example, when the internal pressure of the closed contact sensor 1 increases due to an increase in temperature, the internal gas enters through the opening at the left end of the continuous porous tube 15 in FIG. At the end of the cable 12 to the outside through the gap between the yarns 16. In addition, the internal pressure is reduced due to the decrease in the temperature, and the internal pressure is absorbed in the reverse procedure.

That is, the closed contact sensor 1 according to the embodiment performs a breathing action. Since the cable 12 is wired to the lane control room 4 in the air-conditioned room, a dry and clean gas always flows through the cable inside the closed contact sensor.

FIG. 4 shows a second embodiment. In place of the continuous porous tube 15 shown in FIG. 2, tubes 18a to 18b made of, for example, resin are passed through the center of the cable 12, and the tip is formed. If it is left open and the disk-shaped continuous porous sheet 19 is interposed in the middle, gas flows as described above, and the pressure inside the closed contact sensor is stabilized. The yarn 16 and the tubes 18a to 18b may be any soft elastic bodies.

[0020]

As described in detail above, according to the closed contact sensor of the present invention, the following effects can be obtained. (1) Since gas flows according to expansion and contraction due to a change in temperature, the pressure inside the closed contact sensor is stabilized. (2) Since the pressure is stabilized, the gap between the contacts can be kept constant, and the operation load becomes constant. (3) Since dry and clean gas flows, the thin metal plate does not corrode, and malfunctions of the contacts are eliminated, thereby improving reliability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a closed contact sensor according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing the first embodiment.

FIG. 3 is a sectional view showing the first embodiment.

FIG. 4 is a sectional view showing a second embodiment.

FIG. 5 is a sectional view showing a second embodiment.

FIG. 6 is a perspective view showing a toll collection system.

FIG. 7 is a perspective view showing the inside of a closed contact sensor.

FIG. 8 is a partial view showing a conventional cable.

FIG. 9 is a cross-sectional view of the closed contact sensor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Closed contact sensor, 2 ... Vehicle separator, 3 ... Vehicle height detector, 4 ... Lane control device, 7 ... Upper metal thin plate, 8 ... Lower metal thin plate, 9 ... Insulating plate, 10 ... Gap, 12 ... cable,
13 ... lead wire, 15 ... continuous porous tube, 16 ...
Thread, 17 ... stopper, 18a, 18b ... tube, 19 ... continuous porous sheet.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-336638 (JP, A) JP-A 5-97024 (JP, U) JP-A 62-54552 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) H01H 13/16 G08G 1/02

Claims (1)

(57) [Claims] 1. A pair of strip-shaped metal thin plates which are vertically opposed to each other at a predetermined interval and which are brought into a conductive state by being contacted when a pressing force is applied from an upper surface, and a pair of the strip-shaped metal thin plates are arranged at a predetermined interval. A plurality of sets of a soft elastic body horizontally long box sealed container that is arranged and held in a fixed position and one end is individually connected to the strip-shaped metal sheet and the other end is led out of the horizontally elongated box closed container. A cable having a signal line, and having a breathing function for flowing gas inside the horizontally long box-shaped closed container, wherein the breathing function is a continuous cable that passes through the inside of the cable in the axial direction.
Around the perforated tube and the continuous perforated tube
A vehicle entry detection sensor comprising a yarn that is laminated and sealed in the axial direction .