JPH0414299B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-car urine detection device for preventing urination in an elevator car.

[Conventional technology]

In apartment complexes without communal toilets and elevators in multi-tenant buildings where there are many drunk customers, people sometimes urinate in the elevator cars. Conventionally, there was no means to prevent such urination, and it was left up to each person's awareness.

[Problem that the invention seeks to solve]

By the way, there is a certain limit to what can be left to one's own self-awareness, and it is even more impossible to expect a drunk customer to be self-conscious, so urination has been carried out in the car. As a result, a foul odor pervaded the inside of the basket, making it unsanitary. Also,
If left unattended, the cage floor and walls would corrode and be dangerous.

The purpose of this invention is to prevent urination inside the cage.

[Means for solving problems]

The in-car urine detection device for an elevator according to the present invention is such that an electrode is provided in the car, and an alarm is activated when the electrode shows a specific resistance value when covered with urine.

[Effect]

In the elevator car urine detection device according to the present invention, when urination occurs in the car, the alarm is activated, so that the person who urinates is surprised, and a third party comes to know about it, making him feel embarrassed. acts to prevent urination.

[Embodiments of the invention]

1 to 3 show an embodiment of the present invention.

First, in FIG. 1, 1a and 1b are a pair of electrodes attached in parallel to the upright part of the car, and 2 is a high level signal (hereinafter, signal H) when the resistance value between the electrodes 1a and 1b is within a predetermined range Detector 3 outputs a low level signal (also referred to as signal L. be done. 4 is a connector that activates the telephone 5 in the manager's room when the detector 2 outputs a signal H;
It tells you that you are urinating.

Next, in FIG. 2, V is a positive power supply, typically 5 volts. R _N1 and R _N2 are distribution resistors connected in series, R _L1 and R _L2 are also distribution resistors, and R _P
is a resistor with one end grounded and the other end connected to electrode 1a, C is a capacitor connected in parallel to resistor R _P , and A is a non-inverting terminal connected to distribution resistors R _N1 , R _N2
The inverting terminal connected between the two electrodes is a comparator whose inverting terminal is connected to the electrode 1a. B is a comparator having a non-inverting terminal connected to the electrode 1a and an inverting terminal connected between the distribution resistors R _L1 and R _L2 . R _a and R _b are resistors connected to the positive power supply (+) and the output terminals of comparators A and B, respectively; 10 is an AND element; 11 is a delay timer that counts the clock pulses of the oscillator 12;
When the signal H of the AND element 10 is input, it outputs the signal H two seconds later. 13 is a resistor connected to the output terminal of the delay timer 11; 14 is a transistor whose base is connected to the resistor 13 and whose emitter is grounded;
15 is a relay connected to the collector of the transistor 14, and 15a is a normally open contact of this relay 15 to operate the buzzer 3. 15b is a normally open contact which operates the connector 4.

In Figures 3 and 4, 20 is a car compartment, 2
1 is a car door that opens and closes the entrance to the car room 20; 2
2 is a car floor, 23 is a side wall erected on this car floor 22, 24 is a baseboard glued to the lower end of this side wall 23, and is provided around the entire circumference of the car room 20 except for the entrance/exit area, Electrodes 1a and 1b are exposed in two grooves that open to the inside of the car room 20. 25 is a reinforcing member that reinforces the baseboard 24 from the outside of the car room 20.

By the way, if the interval between the electrodes 1a and 1b is 50 mm, and the flow rate is 10 cubic centimeters per second, adult urine with a flow diameter of about 5 mm will be transferred to the electrodes 1a and 1b.
b, the resistance between electrodes 1a and 1b is
It is known that it will be 100 kilo ohms to 150 kilo ohms. For tap water with the same flow rate and flow diameter:
It is 250 kilohms to 300 kilohms. Also, if you short it with a piece of metal, it will drop to zero.

On the other hand, in Fig. 2, the voltage of the positive power supply V is V volts, the resistance value between the electrodes 1a and 1b is R, and the resistance values of the resistors R _N1 , R _N2 , R _L1 , R _L2 , and R _P are respectively
Assuming R _N1 , R _N2 , R _L1 , R _L2 , and R _P , R _N2 /R _N1 +R _N2 >R _p /R+R _P (1) At this time, comparator A outputs signal H.

R _N2 /R _N1 +R _N2 > R _p /R + R _P (2) At this time, comparator A outputs signal L.

R _L2 /R _L1 +R _L2 > R _p /R + R _P (3) At this time, comparator B outputs signal H.

R _L2 /R _L1 +R _L2 > R _p /R + R _P (4) At this time, comparator B outputs signal L.

Therefore, comparators A and B both output signals H when equations (1) and (3) are simultaneously satisfied, and the following equation is calculated from this.

R _N1 /R _N2 R _P ＜R＜R _L1 /R _L2 R _P ……(5) Now, to detect only urine, R _N1 /R _N2 R _P =100 kilohms R _L1 /R _L2 R _P = It is selected to be 150 kilohms.

Next, we will discuss the operation.

Assuming that no urine is being urinated, the resistance value R between the electrodes 1a and 1b is approximately equal to infinity. Therefore(1)
Equations (4) and (4) hold true, and comparator B outputs signal L. Therefore, the output of the AND element 10 becomes the signal L, and the output of the delay timer 11 also becomes the signal L.
The transistor 14 remains non-conductive. Therefore, the buzzer 3 and telephone 5 do not operate.

Next, if the electrodes 1a and 1b are short-circuited with a metal piece, the resistance value R becomes almost zero. For this reason, (2)
Equations (3) and (3) hold true, and the output of comparator A becomes signal L. Therefore, similarly to the above, the buzzer 3 and telephone 5 do not operate.

Next, suppose that the electrodes 1a and 1b are short-circuited by urine. At this time, the resistance value R becomes 100 kilohms to 15 kilohms, equations (1) and (3) are established, and both comparators A and B output signals H. Therefore, the output of the AND element 10 also becomes a signal H, and the delay timer 11 counts the time. In the case of urine, the state is normally maintained for 2 seconds or more, so the delay timer 11 outputs a signal H after 2 seconds have elapsed. Transistor 14 is made conductive by this signal H, energizing relay 15, and both normally open contacts 15a and 15b are closed. The buzzer 3 sounds when the contact 15a is closed, giving a warning. Also contact point 15b
This activates the connector 4 and automatically notifies the manager via the telephone 5 that urination is being urinated.

Also, it happens that the resistance value R is 100 kilohms to 150
Even if the value reaches kilo-ohm, if this state continues for less than 2 seconds, the delay timer 11 will not output the signal H, so the buzzer 3 etc. will not operate. Such conditions are usually not caused by urine, but by mischief or accidental phenomena, which should be prevented.

〔Effect of the invention〕

As described above, according to the present invention, since the electrodes are placed vertically apart from each other by a predetermined distance, urine wets both electrodes together due to its drooping property, thereby making it possible to detect the urine with high accuracy. On the other hand, dust and the like slide down, are difficult to accumulate, and are not capable of bridging the quantity electrodes. Therefore, malfunctions due to dust or the like can be avoided. In other words, even though the car is used by an unspecified number of people and easily gets dirty, false detection can be avoided even if the car is used for many years.

Furthermore, since the resistance value when the electrode is stained with urine is set in advance and the device operates only within this range, it does not operate in an extremely low or high resistance value region. Therefore, it also has the effect that it does not operate when it is exposed to water from raindrops or when a person simply approaches.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention,
FIG. 1 is an overall configuration diagram, FIG. 2 is an electric circuit diagram of a main part, FIG. 3 is a cross-sectional view of the car, and FIG. 4 is a cross-sectional view taken along the line shown in FIG. 3. In the figure, 1a and 1b are electrodes, 2 is a detector, 3 is a bell (alarm), and 20 is a car compartment. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1 A pair of electrodes laid horizontally on the inside of the side wall of the car compartment with a predetermined distance between the top and bottom, and is activated when the resistance value between these electrodes is within a preset range of resistance value when urine is urinated. An elevator car urine detection device consisting of a detector that detects urine, and an alarm that is activated by the operating signal of this detector.