FI65949C - SIGNALING FOR FORDON - Google Patents

Description

65949

The present invention relates to a signaling device for vehicles, consisting of a flexible-walled tube, a light transmitter and a light receiver spaced apart inside the tube, and an electrical circuit connected to the light receiver which either provides a signal when the tube is notched and compressed. the change in luminance exceeds the given limit value or compensates for the change in luminance when it does not exceed the given limit value.

When closing the doors of buses and other public transport vehicles, dangerous situations arise when people or objects are trapped between the closing doors and the driver is prevented from seeing the doors. For this reason, there has been a need to develop devices that can reliably identify and give an alarm for crushing that occurs against the edge of a door in the aforementioned hazards. To solve this task, devices have been built to measure the compression or deflection of the edging rubber at the edges of the doors. Inside the rim rubber is, for example, a hose filled with compressed air, to the end of which a pressure switch is connected. When the internal pressure in the hose rises above the set limit, the switch closes the circuit for alarm.

A device is also known in which a wire with a microswitch connected to one end is inserted inside the rim rubber. As the rim rubber compresses, the wire bends, allowing the microswitch to operate.

Both devices have the disadvantage that the minimum compression that produces 30 signals varies with environmental conditions and time. In the case of a pressure hose, these variations are caused, for example, by temperature fluctuations and leakage of compressed air from the hose over time. Accordingly, the length of the yarn depends on the air temperature 35 and / or humidity and the yarn stretches over time. For these reasons, these known devices cannot be made very sensitive to 65949, and the curbs must be compressed considerably before the device alerts. For the same reason, the devices are also relatively short-lived. A further disadvantage of the yarn structure is that it can only be used in 5 straight edging rubbers.

The use of a light beam in connection with signaling is known. DE-A-1 945 621 discloses an airbag deployment device consisting of straight and rigid tubes attached to the exterior of a vehicle, having a light receiver and transmitter at their 10 ends, which trigger the airbags when compressed in the event of a crash, as the light connection . It is clear that the rigidity of the pipe prevents the use of this known device as a safety device for doors 15 or as a stop signal switch. In addition, over time, dust and other similar factors may degrade the light received by the receiver to the extent that the air cushions deploy without the tube being compressed.

The object of the present invention is to provide a signal-20 delivery device by means of which a sufficiently high sensitivity can be achieved to detect, for example, a compression corresponding to a remnant between a human wrist in curbs, since its operation is not dependent on environmental conditions. The invention is characterized in that the means for compensating for the change in the luminous intensity 25 included in the electrical circuit include a delay circuit which prevents the compensation from being performed before the end of the time determined by it.

By using a light beam as a detection means and incorporating means of the device's electrical circuitry to compensate for long-term and / or slow changes in the device due to environmental conditions or wear and tear, the device can be made very sensitive, as these slow changes do not have to be taken into account. The device is also long-lasting, because the changes in characteristics caused by 35 times are compensated by increasing or decreasing the luminous intensity of the light transmitter according to the 65949 situation. In addition, it is clear that the reflection of light from the inner surfaces of the edging rubber allows the device to be used also in curved edging rubbers.

Due to the fact that the device according to the invention can be adjusted very sensitively, it has surprisingly been found that in addition to the application described above, the device can also be used as a stop signal switch in buses, the signal being given by pressing the tube with a finger.

The signaling device according to the invention will be described in more detail below with reference to the accompanying drawing, in which Fig. 1 shows the operating principle of the device, Fig. 2 shows a block diagram of the device's DC connection, and Fig. 3 shows a block diagram of the device's AC connection.

Figure 1 shows a vehicle door 1 with a hollow edging rubber 2 or some other similar flexible profile at the vertical edge.

The tube may also consist of a profile which has a cross-section corresponding to the circumferential part of the circle and which, together with the base, forms a closed tube.

A light transmitter 3 such as an incandescent lamp, an LED or the like is arranged at the lower end of the cavity of the rim rubber, and a light receiver 4 such as a light emitting diode, transistor, resistor or the like is provided at the upper end of the cavity 25.

The light transmitter 3 generates a light beam which passes inside the rim rubber to the light receiver 4.

Figure 2 shows a block diagram of the DC connection 30 of the device. According to it, a current generator 5 is connected to the transmitter diode 3, while the PIN diode 4 acting as a receiver is connected to a two-stage DC amplifier circuit 6 and 7. The output of the second amplifier 7 is connected to two parallel comparators 8 and 9, of which comparator 9 compares 7 incoming signals to the limit voltage U „. . The comparator 9 is connected to the SR flip-flop 10 and this Γα] d «65949 is further connected to the relay 11, which triggers an alarm.

According to the invention, a comparator 8 comparing the reference voltage Uref is connected to a delay circuit 12 having a delay time of, for example, 10 s and connected to the current generator 5 via an automatic gain control circuit (AVS) 13. A third comparator 14 is also connected to the AVS circuit 13, which compares the signal of the AVS circuit with the limit voltage. Line · The comparator is connected to a fault alarm device (not shown).

10 In use, the current given by the current generator 5 determines the light intensity of the light transmitter 3. The current provided by the diode 4 is amplified in the amplifiers 6, 7 and fed to the comparators 8, 9. The comparator 9 senses the rapid changes in this signal exceeding the limit voltage caused by the sudden compression of the tube 2 and sets the flip-flop 10, which further controls the relay 11.

If the level of the signal from the amplifier 7 changes so slowly that the groove is not exceeded in the time set in the delay circuit 12, no alarm is generated, but then 20 signals are transmitted from the delay circuit via the AVS circuit 13 to a current generator controlled by e.g. luminous intensity until the light intensity received by the receiver 4 has returned to the previous level, whereby the level of the signal received by the comparators 8, 9 returns to the constant level. In this way, the device compensates for the slow changes caused by external factors that affect the intensity of the light beam, which allows the device to be made very sensitive. At the same time, the alarm caused by slow but perhaps even large changes in luminous intensity over time is prevented.

However, if the signal level of the AVS circuit has changed, e.g. increased, to such an extent that it exceeds the limit voltage set in the comparator 14, a fault alarm is generated because the compensating capacity of the device is then exhausted.

The AC connection shown in Figure 3 operates in principle in the same way as the DC connection described above. However, in this case 5 65949, an oscillator 15 / is connected to the current generator 5 / so that the transmitter diode 3 is pulsed. In addition, the second DC amplifier 7 has been replaced by an AC amplifier 16, which separates the pulse-like signal from the background DC component and is followed by a peak detector 17 for detecting the signal.

The peak detector is followed by similar comparator, delay and AVS circuits as in the DC connection.

Due to its sensitivity, the above principle also makes it possible to implement other types of alarm and signaling devices, such as stop signaling switches in public vehicles and safety-edge switches in work machines. The profile is then a long, continuous spring-walled tube, inside which there is a light connection from the transmitter to the receiver, and which in the form of a signaling switch embodiment is fixed to the vehicle wall, e.g. in a horizontal position above the row of windows. When the tube is compressed or pressed from anywhere, there is a change in the luminous intensity coming to the light receiver, which change is interpreted as ON / OFF information by a threshold comparison.

20 The light transmission of a tube can be improved by adding an inner tube or a coating that reflects light better than the actual tube.

Claims (2)

6 Claims 65 94 9 A signaling device for vehicles # consisting of a flexible wall tube (2), a light transmitter (3) and a light receiver (4) spaced apart in the interior of the tube 5, and an electrical circuit connected to the light receiver (4) which either provides a signal when the tube ( 2) the compression and the resulting change in the luminous intensity of the light beam received by the light receiver (4) exceeds a given limit value (Uraja) or compensates for the change in luminous intensity when it does not exceed a given limit value (U_.: _) * The luminance change compensating means (8, 12, 13) included in the circuit include a delay circuit (12) which prevents the compensation from being performed before the time (f7 *) determined by it expires. Signaling device according to Claim 1, characterized in that the time constant K T) of the delay circuit (12) is approximately 10 s.