JPS641588Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a center point display device in a conduit that is installed in a conduit and indicates a position that coincides with the central axis of the conduit.

Conventional configurations and their problems Conventionally, center point display devices installed in pipelines have been installed using stands, but because the bottom of the pipeline is circumferential, installation is difficult. There were problems such as it took time to fix and lacked precision.

Purpose of the invention The present invention aims to provide a display device that can accurately display the center point even if there is an error in the inner diameter of the pipe by providing three support legs that contact the inner wall surface of the pipe. It is something to do.

Structure of the invention In order to achieve the above-mentioned object, the present invention includes a display section indicating the center point, and an identical length that is attached to the outer periphery of the display section and extends outward on a line passing through the center point and comes into contact with the inner wall surface of the pipe. The center point display device in the conduit consists of three supporting legs.

The support legs are three support legs of the same length that extend outward on a line passing through the center point of the display section and come into contact with the inner wall surface of the pipe, so they can be aligned accurately with the center point within the pipe. It became like that.

Description of examples The embodiments shown in the drawings will be described below.

In FIG. 1, reference numeral 1 indicates a central point display section, 2 a frame body, and 3 support legs, which are detachably attached to the frame body 2. This support leg 3 is on a line passing through the center point,
They were made to have the same length extending outward from the display section 1 and abutting on the circumference perpendicular to the central axis of the inner wall of the conduit.

Reference numeral 4 denotes a display section for the center point, which uses a sphere and has support legs 5 extending from the outer periphery of the display section so as to pass through the center. used.

Reference numeral 6 indicates a fastening tool, and reference numeral 7 indicates an extensible adjustment section. 8
9 is a tube, 9 is a laser beam generator, 10 is a spherical tube, and 11 and 12 are cylindrical tubes connected to the spherical tube 10. In either case, support legs 3 or 5
The center of the display section is placed exactly on the central axis of the tube.

Incidentally, as shown in FIG. 3, since the gravity of the display unit 1 is applied to the downward supporting legs 3, it is desirable to strengthen the supporting force. Especially when it has the adjustment part 7,
It is preferable that the springs and the like that support the adjustment part 7 be strengthened compared to the remaining support legs.

The one shown in FIG. 4 has a connecting tube 13 that is screwed onto the support leg 3, and an adjusting rod 14 and a spring 15 are installed inside the connecting tube 13, and the adjusting portion 7 is always in a protruding state due to the urging force of the spring 15. An example configured to maintain .

Figure 5 shows a state in which a laser beam generator is installed inside the tube and the laser beam is irradiated onto the display section of the present invention. It's convenient.

Effects of the invention The present invention supports the display part indicating the center point with three support legs, and installs the support leg tips in contact with the inside of the pipe, and makes the protrusion amount of the adjustment part the same length. Even for tubes with internal diameter errors, the center can be displayed accurately and extremely easily, and there is stability.

A variety of support parts can be used, such as a flat plate or a spherical support part.The three support legs are used to set the support part in the pipe, and since the center point is equidistant from the inner wall surface of the pipe, the center point of the display part can be placed at the same distance as the pipe. This makes it extremely convenient for applications such as burying sewer pipes, etc., where multiple pipes are installed in a straight line or at a certain angle of inclination.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a perspective view showing the same embodiment, Fig. 3 is a front view showing the state installed in the pipeline, Fig. 4 is a sectional view of the main part showing the connection and adjustment part of the support leg, and Fig. 5 is the main part. FIG. 6 is a cross-sectional view of a tube showing a case where a laser beam from a laser beam generating device is observed using the apparatus, and FIG. 6 is a cross-sectional view showing an example of use in a conduit having a spherical body. DESCRIPTION OF SYMBOLS 1, 4... Display part, 3, 5... Support leg, 7... Adjustment part, 15... Spring, 17... T-shaped part.

Claims (1)

[Claims for Utility Model Registration] A display section indicating a center point, and three pieces of the same length attached to the outer periphery of the display section, extending outward on a line passing through the center point and abutting the inner wall surface of the pipe. What is claimed is: 1. A center point display device in a conduit, comprising: a support leg, and an adjustment portion provided at the tips of the three support legs so that the amount of protrusion can be adjusted to the same length via a spring.