JPH0543375Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a circular vial used in surveying instruments, such as levels and theolites.

(Prior art) Conventionally, as shown in Figure 2, an acrylic resin vial a is filled with an oily liquid b containing fluorescent paint or pigment (for example, light green), and a bottom plate c is bonded to the vial a. As shown in Figure 3, a resin or glass top plate e is glued to the top of a metal frame d, and a black ring f is attached to the inner periphery of the frame d. A white metal bottom plate g is fitted to the bottom of the frame body d.
and contains oil-based liquid b′,
As shown in Figure 4, a glass vial a is housed in a frame d, the vial a is fixed with plaster h, and a mixture of alcohol and ether i is placed in the vial a.
It is known that the air bubbles are made easier to see by enclosing them and applying graphite paint to the outer periphery as necessary. Furthermore, the fourth
In the figure, j is a drawing screw hole.

(Problem to be solved by the invention) The conventional liquid shown in Figure 2 has the problem that the color of the liquid fades due to ultraviolet rays and becomes transparent, making it difficult to see the bubbles. The problem is that the structure is complicated because a ring f of black color or the like is fitted in order to make the bubbles easier to see, and the one shown in Figure 4 has black paint applied to the outer periphery or a colored ring to make the bubbles easier to see. There were problems in that it required a lot of man-hours and the structure was complicated.

The object of the present invention is to provide a circular vial that solves the problems described above.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a circular vial comprising a bottom plate, a frame body, and a transparent top plate having a curved surface with a predetermined curvature on the inner surface. , the transparent top plate is made of synthetic resin, the frame body is made of colored synthetic resin with a color different from that of the bottom plate, and the top plate and the frame body are integrally molded by a two-color injection molding method. shall be.

(Function) Since the frame body and the upper plate are integrally molded, it is possible to easily manufacture a bubble tube that does not cause liquid leakage or turbidity of liquid due to adhesive.

Furthermore, since the frame is made of a colored synthetic resin with a color different from that of the bottom plate, and the transparent top plate and the frame are molded using a two-color injection molding method, the visibility of the bubbles can be increased without using a colored ring. .

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an upper plate made of transparent resin such as acrylic resin and has a curved surface with a predetermined curvature on its inner surface, and 2 is a frame made of colored resin such as black acrylic resin. The upper plate 1 and the frame body 2 are molded by a two-color injection molding method and have an integrated structure. A stepped portion 3 is formed on the inside of the open end of the frame 2, and a white or colored bottom plate 4 made of, for example, acrylic resin (however, a color that provides good contrast with the surrounding color) is welded to the stepped portion 3, for example. It is fitted by etc. A hole 5 is formed in the bottom plate 4, and an appropriate amount of volatile oil-based liquid 6 (known) is injected into the inside through the hole 5 so that air bubbles 7 are present.
The hole 5 is closed.

Since the upper plate 1 and the frame body 2 are integrally molded by two-color injection molding, both are made of synthetic resin.

In the above embodiment, the color of the synthetic resin of the frame body 2 is black, but it is not limited to black as long as the outline of the bubbles 7 can be clearly recognized. However, colored and opaque resin is preferable in order to reflect the light entering the bubble tube on the frame 2 and make the outline of the bubble 7 clear.

By using a volatile oil-based liquid as the sealed liquid, it is possible to prevent the upper plate 1 and the frame body 2 made of resin such as acrylic resin from dissolving, and when injecting from the injection hole 5, the hole 5 Even if there is a liquid leak around the area, there will be no adhesion failure due to residual wiping because it is volatile.

(Effects of the Invention) Since the present invention has the above-described configuration, it has advantages such as clear outline of bubbles, simple structure, low cost, and no liquid leakage or turbidity of liquid.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIGS. 2 to 4 are sectional views of conventional examples. 1...Top plate, 2...Frame, 3...Step, 4...
Bottom plate, 6...Volatile oily liquid, 11...Boundary between top plate and bottom plate.

Claims (1)

[Claims for Utility Model Registration] A circular bubble tube comprising a bottom plate, a frame body, and a transparent top plate having a curved surface with a predetermined curvature on its inner surface, wherein the transparent top plate is made of synthetic resin; A circular vial characterized in that the frame body is made of a colored synthetic resin having a color different from that of the bottom plate, and the upper plate and the frame body are integrally molded by a two-color injection molding method.