JPH0442329Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a level measuring device for measuring the level (including cant) of railway tracks.

When measuring the level of railway tracks, especially when the level value is small, it is important to know which track is higher, the left or right.
In other words, it is difficult to determine which trajectory is on the upward side. Conventional level measuring instruments that digitally display this level have been designed to display + or - along with numbers. However, when reading, it was often the case that the measurement bar was mistaken for left or right, resulting in incorrect level measurements. In addition, orbital level measurements are often carried out in bad weather or at night, but when displaying the level on a measurement bar placed on the orbit, there is an inconvenience that the display is difficult to see.

The present invention was developed in view of these circumstances, and it is possible to accurately determine whether the trajectory is on the upward or downward side, and prevent misunderstandings when measuring the level.
Another object of the present invention is to provide a level measuring device that can display the level easily.

In order to achieve this object, the present invention includes a measuring bar equipped with a spirit level and a display box formed separately from the measuring bar and connected to the measuring bar by an electric cable. a pair of indicator lights attached to the inspection bar; and an up-side discrimination circuit for detecting the rising side of the inspection bar based on the output of the level, and one of the indicator lights based on the output of the discrimination circuit. The display box is configured to light up to indicate the rising side of the trajectory, and to display the level in the display box. The present invention will be explained in detail below based on the illustrated embodiments.

FIG. 1 is a diagram showing an example of the present invention in use, and FIG. 2 is an electric circuit diagram thereof. In FIG. 1, reference numeral 10 is an inspection bar, and a pair of left and right pedestals 12,
12a, 12b, and a connecting bar 14 that rigidly connects them. The cradle 12a, 12b is placed on a pair of left and right railway tracks 16, 16, 16b. A spirit level 18 is installed in the pedestal 12b,
Further, a socket 20 is attached to the upper surface of this pedestal 12b.

Reference numerals 22, 22a, and 22b are a pair of left and right indicator lights, which are attached to the upper surfaces of the pedestals 12a and 12b, respectively.

24 is a display box, and 25 is an electric cable that connects this display box 24 to the inspection bar 10. Display box 2
4 is constructed as shown in FIG. In this figure, 26 is a low-pass filter that removes noise consisting of high frequency components contained in the analog voltage signal output from the level gauge 18. A differential amplifier 28 amplifies the difference between the output voltage of the low-pass filter 26 and the output voltage of the zero adjustment variable resistor 30.

32 is an A/D converter, and the analog voltage signal corresponding to the level output by the differential amplifier 28 is converted into a BCD code in this A/D converter 32. 34 is a decoder, which converts this BCD code into a decimal number. 36 is a display device,
For example, it consists of numbers made up of 7 segments using LEDs. The display 36 digitally displays the level based on the output of the decoder 34.

The polarity of the output voltage of the differential amplifier 28 is inverted depending on whether the output voltage of the level gauge 18 is higher than or lower than the output voltage of the variable resistor 30. A/D converter 3
2 determines this polarity and outputs a signal a indicating the polarity. Reference numeral 38 denotes a rising side discrimination circuit which discriminates the polarity of the output signal a of the A/D converter 32 and selectively lights up one of the indicator lights 22a, 22b on the rising side track side. This discrimination circuit 38 is
For example, the signal a is input to the common base of the PNP transistor and the NPN transistor, and when the signal a is positive, the NPN transistor is turned on and one of the indicator lamps 22 is lit, and when the signal a is negative, the PNP
It can be configured to turn on the transistor and light up the other indicator light 22.

Note that 40 is a battery, 42 is a power switch,
By pressing this switch 42, current flows through the electrical circuit components and measurements are taken.

When measuring the level of the track, first check the measurement bar 1.
While holding the 0 horizontally, press the switch 42,
Adjust the variable resistor 3 so that the display on the display 36 becomes zero.
Adjust 0. Then, when the inspection bar 10 is placed on the track 16, the level is displayed on the display 36 based on the output voltage of the level gauge 18 corresponding to the difference in height between the left and right tracks.
will be displayed. Further, depending on the polarity of the output of the differential amplifier 28, the indicator light 22a or 22b on the ascending track lights up. By lighting the indicator light 22, the upward trajectory can be visually confirmed.

In this embodiment, the indicator light 22a near the rising track
However, in the present invention, conversely, the indicator light 22a or 22b of the descending track is turned on.
Of course, it is also possible to turn on b.

As described above, the present invention is configured such that a pair of indicator lights are provided on the inspection bar, and a rising side discriminating circuit is used to identify the rising side trajectory and light one of the indicator lights. It can be determined reliably and easily, and misunderstandings during level measurement can be reliably prevented.
Furthermore, since the display box is made separate from the test bar, the display can be checked by bringing only the display box close to the face, making it easier to see the level display. Furthermore, if the display box is separated like this, its orientation can change freely with respect to the inspection bar, so even if, for example, "up to the right" is displayed, it is easy to mistake which trajectory is the right one. According to the invention, it can be confirmed by lighting up the indicator light, so there is no chance of making a mistake.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the present invention in use, and FIG. 2 is an electric circuit diagram thereof. 10...Measuring bar, 18...Level, 22...
Indicator light, 24...Display box, 25...Electric cable, 38...Discrimination circuit.

Claims (1)

[Claims for Utility Model Registration] A device comprising an inspection bar with a spirit level attached thereto, and a display box formed separately from the inspection bar and connected to the inspection bar by an electric cable, which includes: A pair of indicator lights attached to the bar,
and a rising side discrimination circuit that detects the rising side of the inspection bar based on the output of the level device, and one of the indicator lights is lit based on the output of the discrimination circuit to indicate the rising side of the track, and the level indicator A leveling device for a track, characterized in that the following is displayed in the display box.