JPH05188101A - Seating status determination apparatus - Google Patents

Abstract

PURPOSE:To reduce the number of wires among respective seats so as to simplify this wiring task and largely reduce cost for facility and wiring. CONSTITUTION:A seating status determination apparatus comprises a resistance value detecting circuit 3 for detecting resistance values of circuits including resistors 2a to 2n and limit switches 1a to 1n provided for respective seats with turn-on and turn-off of the limit switches 1a to 1n and an occupied seat determining circuit 8 for comparing the resistance values detected by the resistance value detecting circuit 3 with resistance values predetermined corresponding to occupied seats for determining the seats which are being occupied. Based on the resistance values detected by the resistance value detecting circuit 3, an occupied seat number determining circuit 9 is allowed to determine the number of the seats which are being occupied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat condition determination device for determining the number of seats or vacant seats and the number of seats in a facility where many people are seated or objects are placed.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a conventional seat condition determination device. In the drawing, A, B, C, D, ... N are seats and are turned off when a person sits on them. Switch 20
a to 20n are provided as sensors for presence detection. Reference numeral 21 is connected to a circuit having each of the switches 20a to 20n to individually determine whether these switches 20a to 20n are on or off, and 22 is a determination output from the presence determination circuit 21. It is a display unit that receives and displays whether or not the user is present.

Next, the operation will be described. First, the presence determination circuit 21 switches the switches 20a to 20 when the seat is used.
flowing a constant current through each of the above circuits having n ,. here,
If a person sits in one of the seats, for example, seat A,
Since the corresponding switch 20a is opened, the current of the circuit including this switch 20a is cut off. For this reason, the presence determination circuit 21 outputs a signal indicating that the seat A is in the presence state to the display unit 22 by the current interruption, and the display unit 22
Indicates this by turning on the lamp 23a of the lamps 23a to 23n. The presence / absence of seats in other seats is similarly determined and displayed in the same manner.

[0004]

Since the conventional seat condition determination device is configured as described above, each switch 20
A complicated wiring must be provided for each of a to 20n, and the number of wirings also increases as the number of switches 20a to 20n increases, resulting in a thick bundle as a whole, which is complicated in structure and large in scale. There was a problem such as becoming.
Incidentally, as a related prior art, there is one described in JP-A-1-156203.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a seat situation determination device which is simple in wiring, small in scale, and capable of highly accurately determining the presence situation. To aim.

[0006]

A seat condition determination device according to the present invention is provided with a limit switch on / off,
A resistance value determination circuit that determines the resistance value of the circuit including the resistance provided for each seat and the limit switch, the resistance value determined by the resistance value determination circuit, and the value set in advance corresponding to the seat in the seat A seating determination circuit that determines the currently seated seat by comparing the resistance value is provided, and the seating number determination circuit is currently seated based on the resistance value determined by the resistance value determination circuit. The number of seats inside is determined.

[0007]

The resistance provided for each seat in this invention is connected in series with different resistance values.
Therefore, when either one of them is short-circuited or connected by turning on or off the limit switch due to the presence of the seat, the overall combined resistance value becomes a specific resistance value corresponding to the switch that is turned on or off. The resistance value determination circuit obtains the seats in the seat corresponding to such a specific resistance value from the presence determination circuit and displays them on the display means, or obtains the number of seats and the number of vacant seats by the number of seats determination circuit. Or display it.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1a to 1n are installed in seats,
And limit switches 2b to 2n, which are automatic reset type b-contact type and are connected in series to each other, are limit switches 1a to 1
A resistor connected in parallel to each of n, 4 is a seat state determination unit that determines the state of the entire seat, and 5 is a seat state determination unit 4
It is a seat status display panel that displays the results obtained in.

Further, the seat state judging section 4 is constructed as shown in FIG. In the figure, 3 is a resistance value determination circuit for determining the resistance value of the entire circuit, to which a series connection circuit of the resistors 2a to 2n is connected. Reference numeral 12 is a seating storage memory, 8 is a seating determination circuit that determines the seating status by referring to the seating storage memory 12, and 9 is a seating number determination circuit that determines the current number of seats. Further, in the seat status display panel 5, 10 is a display circuit for displaying the presence number or the like of the determination result on the display device 7 as a display unit, and 11 is based on the number of seats determined by the number of seats determination circuit 9. A vacant seat number digital display circuit for obtaining the vacant seat number and displaying the vacant seat number, and a vacant seat number display 6 as a display means.

Next, the operation will be described. First, different resistance values that specify each seat are set for each of the resistances 2a to 2n. Here, as shown in FIG. 2, for example, each of the resistors 2a, 2b, 2c, and 2d connected in parallel to the limit switches 1a, 1b, 1c, and 1d has a resistance of 1Ω,
2Ω, 4Ω, 8Ω. Then, a constant voltage is applied from the resistance value determination circuit 3 to these series-connected circuits. here,
When the limit switch 1a is turned off by a person sitting in any seat, for example, the seat A, the current flows through the resistor 2a having a resistance value of 1Ω. As a result, the resistance value of the entire series circuit changes. In other words, 1 as a whole series circuit
Becomes Ω.

When a person sits on another seat and the limit switch 1a and the limit switch 1b are turned off, a current flows through both the resistors 2a and 2b. As a result, the resistance value of the entire series circuit changes to 3Ω.
That is, when the resistance value is 3Ω, the limit switch 1a,
It can be determined that a person is sitting in the two seats A and B corresponding to 1b. Therefore, if the resistance value and the seat number are made to correspond to each other in advance and stored in a table, and the table is stored in the seat storage memory as a reference value, the resistance value determination circuit 3
The seat corresponding to the resistance value determined in step 3 can be immediately determined by the seat determination circuit by referring to the seat storage memory 12.

The table stored in the seated storage memory 12 is, for example, as shown in FIG. 3, and the combined resistance value of the selected four serially connected resistors 2a to 2d is shown in the left column. As shown in the right column, the seating status of each seat can be specified with high accuracy. For example, when the combined resistance value of the resistors 2a to 2d is 7Ω, the limit switches 1a, 1b, 1c
When the three seats corresponding to No. 1 are present and the combined resistance value is 15Ω, it can be determined that all the seats corresponding to the limit switches 1a to 1d are present. That is, by setting a resistance value peculiar to each seat, it is possible to easily identify the seat that is present from the magnitude of the combined resistance value. Then, if the number of seats is large, it can be dealt with by specifying in consideration of the combination of resistance values for each seat.

Here, a change in the resistance value of these circuits as a whole is discriminated by the resistance value discriminating circuit 3, where all the discriminated resistance values are registered in advance in the presence determination circuit 8. By referring to the above table of the storage memory, it can be recognized that the corresponding seat is present. The status result thus obtained is displayed on the display 7 by the display circuit 10. Further, based on the resistance value obtained by the resistance value determining circuit 3, the present number of seats is calculated by the seating number judgment circuit 9, and based on the result, the vacant seat number digital display circuit 1
By 1, the current total number of vacant seats is displayed on the vacant seat number display device 6.

In the above embodiment, the resistance value determination circuit 3 recognizes the change in the resistance value of the entire circuit caused by turning on and off the limit switches 1a to 1n attached to each seat, and based on that, whether or not the user is seated. However, in the same circuit, the limit switches 1a to 1n are turned on,
The change in the current value due to the change in the resistance value of the entire circuit caused by turning off may be recognized by using the current value determination circuit instead of the resistance value determination circuit, and based on that, whether or not the user is present may be determined. It goes without saying that it is good.

In both the method of recognizing the change in the resistance value of the entire circuit and the method of recognizing the change in the current value of the entire circuit as in the above embodiment, the types of the limit switches 1a to 1n are as follows. A method of using an automatic return type b-contact limit switch in which the contacts of the limit switches 1a to 1n are opened by a person sitting on the seat as in the above-described embodiment, and the current flows through the resistors 2a to 2n. On the contrary, the contact of the limit switch is closed when a person sits down, and a method of using an a-contact type limit switch of automatic reset type in which current flows through the limit switch can be adopted. .

Further, in the above-mentioned embodiment, the management of the seat on which a person sits has been described, but it can also be used for management of a mounting table as a seat on which an article or a vehicle is placed in article management or in-vehicle management. Has the same effect.

[0017]

As described above, according to the present invention, a resistance value determination circuit for determining the resistance value provided for each seat and the resistance value of the circuit including the limit switch by turning the limit switch on and off, and By providing a presence determination circuit that compares the resistance value determined by the resistance value determination circuit and the resistance value set in advance corresponding to the seat currently present, and determines the seat currently present, Since the number-of-occupancy determination circuit is configured to determine the number of seats presently present based on the resistance value determined by the resistance value determination circuit, it is only necessary to wire, for example, between each seat. The position (number) of seats and the number of vacant seats can be easily and surely recognized, and there is an effect that can be realized by a small-scale facility when considering the entire device.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a seat condition determination device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a specific configuration of the seat condition determination device of FIG.

FIG. 3 is a table diagram showing table contents of an attendance storage memory in FIG.

FIG. 4 is a configuration diagram showing a conventional seat condition determination device.

[Explanation of symbols]

 1a to 1n Limit switch 2a to 2n Resistance 3 Resistance value determination circuit 8 Occupancy determination circuit 9 Occupancy number determination circuit

Claims (1)

[Claims] 1. A limit switch which is provided for each of a plurality of seats and which is turned on or off upon detecting seating,
The resistors connected in parallel to each of the limit switches and connected in series with each having a specific resistance value, and the resistance value of the circuit including the resistance switch and the resistance switch by turning the limit switch on and off. A resistance value determination circuit for determining, a resistance value determined by the resistance value determination circuit, and a resistance value set in advance corresponding to the seat currently present are compared to determine the present seat present. A seat condition determination device comprising: an occupancy determination circuit; and an occupancy determination circuit that determines the number of seats currently present based on the resistance value determined by the resistance determination circuit.