JPH062090Y2 - Round bubble tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a circular bubble tube used for leveling surveying instruments and the like.

(Prior Art) As a conventional circular bubble tube a, as shown in FIG. 3, a transparent disc e whose lower surface is formed into a spherical concave surface b and which is provided with an index ring d indicating the reference position of the bubble c in the center thereof. The bubble tube body f
It is known that it is bound to the upper surface and is housed in a housing g.

(Problems to be solved by the invention) However, the above-described conventional circular bubble tube a is stored in a leveling table h such as a surveying instrument or a dedicated concave portion i of the upper plate when used. In the case where the tube a has a transparent disk e bonded to the upper surface of the bubble tube main body f, the storage position is not specified for storing it in the storage body g, and thus the level is not horizontal after the storage in the recess i. In many cases, in other words, the bubble c is not located in the center of the index ring d. In such a case, the bubbles c are provided at appropriate intervals in the circumferential direction penetrating the leveling table h and the upper plate portion. By moving the adjusting screw j of the book, the circular bubble tube a should be swung around the convex portion k at the center of the bottom surface of the container g, and the bubble c should be positioned horizontally at the center of the index ring d. First, the adjusting screw j and the convex portion k are essential. In this case, the circular bubble tube a can be made horizontal by the convex portion k and the adjusting screw j, but since the machine body cannot be made horizontal, the machine body does not have a rotating shaft (not shown) and a leveling table. requires h.

Therefore, in order to make the machine horizontal, the adjustment screw j and the adjustment screw (not shown) of the leveling table h are used to adjust each of the displacement amount of the bubble c and the index ring d by 1/2. The bubble c is adjusted to be located at the center of the index ring d at any position with respect to the rotation axis. As described above, there are inconveniences such as requiring skill for adjustment.

(Means for Solving the Problems) The present invention aims to eliminate the above-mentioned inconvenience,
A bubble tube main body composed of a transparent disc having a lower surface formed into a spherical concave surface and provided with an index ring indicating the reference position of bubbles in the center, and a tube portion having the transparent disc bonded to the upper surface In a circular bubble tube, the bottom surface of the containing body is formed into a flat surface, and the bubble tube main body is allowed to be housed in the containing body with a gap into which a solidifying filler can be injected. Is formed to have a diameter larger than the outer shape of the tube portion, and an annular protrusion that receives the lower surface of the peripheral portion of the transparent disk is provided on the upper part of the housing.

(Operation) The present invention has the above-mentioned structure. According to the present invention, when the container is placed on the surface plate and the transparent disk is attached to the upper surface of the bubble tube body, the transparent circle is stored in the container. Since the plate is formed with a diameter larger than the outer shape of the pipe part, the lower surface of the peripheral edge of the transparent disc is supported by the annular projection of the housing, and the peripheral edge part is positioned outside the annular projection. Therefore, even if the bubble is not located in the center of the index ring, move the transparent disk so that the lower surface of the peripheral edge slides on the protrusion of the storage body to position the bubble in the center of the index ring. Therefore, the convex portion k as in the conventional case is unnecessary. At this time, if the bottom surface of the container is used as a reference and the bottom surface is placed on a horizontal plane, the bubble can be positioned at the center of the index ring by simply moving the transparent disc. With the vial tube constructed in this way, leveling can be performed by tilting only the machine to be leveled.

(Example) Next, the Example of this invention is described based on drawing.

In FIG. 1, reference numeral 1 denotes a circular bubble tube, and the circular bubble tube 1 has a transparent circular disc 2 made of glass on the upper surface of a tubular portion 3 having a bottom.
It is composed of a bubble tube main body and a housing body 4 which are closed by.

The transparent disk 2 has a lower surface processed into a spherical concave surface 5 having a predetermined radius, and an index ring 7 representing the reference position of the bubble 6 is clearly formed by photo-corrosion or sputtering at the center of the upper surface or the lower surface.

Liquid 8 is left in the tube portion 3 of the bubble tube body leaving room for bubbles 6.
Is housed.

As the liquid 8, a mixed liquid of alcohol and ether is generally used.

The accommodating body 4 is for accommodating the bubble tube main body 3, and has an annular projection 9 that supports the lower surface of the peripheral edge of the transparent disc 2 at the upper part of the inner wall thereof, and an annular shape in which the peripheral edge of the transparent disc 2 extends along the outside thereof. Groove
10 is provided, and the bottom surface B and the top surface A of the annular projection 9 are preferably formed in parallel to each other with high precision. In this way, as long as the vial body 3 is housed in the housing body 4, the machine can be leveled without any adjustment.

In order to integrate the transparent disc 2, the tube portion 3 and the storage body 4, the gypsum is introduced from the bottom injection port 15 of the storage body 4 as in the conventional case.
It may be filled with 11 to be solidified, or an adhesive 12 may be applied to or adhered to the upper part of the inner wall of the housing body 4, and both gypsum 11 and adhesive 12 may be used as shown in FIG. good.

Further, since the parallelism between the bottom surface of the storage body 4 and the annular projection 9 manufactured by machining is determined by the precision of the processing machine, it is necessary to examine it in advance and decide whether to make it an adjustment type. The circular bubble tube 1 is manufactured and leveled, for example, as follows.

First, the transparent disc 2 whose lower surface is processed into a spherical concave surface 5 is bonded to the upper surface of a cylindrical member processed into a spherical convex surface with an adhesive or the like.

Then, the lower surface of the tubular member is inverted to heat and deform the lower surface opening to make the lower surface opening smaller, and the mixed liquid of alcohol and ether is accommodated in the tubular member through the small-diameter opening, and then the lower surface is further heat deformed. The opening is closed to form the bottomed tubular tube portion 3.

Next, the inverted one, that is, the transparent disc 2 bonded to the upper surface of the tube portion 3 is returned to its original state and is stored in the storage body 4 placed on the surface plate 13 and having an open upper surface. At this time, if the bubble 6 is located at the center of the index ring 7 of the transparent disc 2, it is not necessary to adjust it because it is horizontal, but if the bubble 6 is displaced from the center, the transparent disc 2 is moved to that position. The lower surface of the peripheral edge is slidably moved on the annular projection 9 of the storage body so that the bubble 6 is positioned at the center, and the horizontal position is obtained.

After being leveled, the adhesive 12 is injected and bonded to the upper part of the inner wall of the storage body 4 and the plaster 11 is filled and hardened from the bottom of the storage body 4 so that the transparent disk 2, the pipe portion 3 and the storage body 4 and 4 are integrally formed. The circular bubble tube 1 housed in the housing 4 is attached to the machine body, and the housing 4 is fixed to the machine mounting surface by the fixing screw 16.

At this time, the machine can be leveled only by making the bubble 6 come to the center of the index ring 7. For example, in the case of the leveling table 13 having no rotation axis as shown in FIG. 2, it can be easily performed by attaching the circular bubble tube 1 to the leveling table 13 and setting it horizontal.

(Effect of the Invention) As described above, according to the present invention, the transparent disk to which the tube portion is bonded can be moved horizontally by simply moving it in the storage body, and the adjustment screw as in the conventional example is unnecessary. Along with this, it has the effect that the level can be easily set up wherever there is a surface plate on which the container is placed.

[Brief description of drawings]

FIG. 1 is a cutaway front view showing an embodiment of the present invention, FIG. 2 is a perspective view when the circular bubble tube of FIG. 1 is attached to a leveling table, and FIG. 3 is a cutaway front view of a conventional example. Is. DESCRIPTION OF SYMBOLS 1 ... Circular bubble tube, 2 ... Transparent disc 3 ... Tube part, 4 ... Storage body 5 ... Concave surface, 6 ... Bubbles 7 ... Index ring, 9 ... Annular protrusion

Claims (1)

[Scope of utility model registration request] 1. A bubble composed of a transparent disk having a spherical concave surface on the lower surface and provided with an index ring for indicating the reference position of the bubble in the center, and a tube portion having the transparent disk bonded to the upper surface. In a circular bubble tube in which a tube body is housed in a housing body, a bottom surface of the housing body is formed into a flat surface and the bubble tube body is housed in the housing body with a gap in which a solidifying filler can be injected. , Forming the transparent disc with a diameter larger than the outer shape of the tube portion,
A circular bubble tube, characterized in that an annular projection is provided on the upper part of the housing to receive the lower surface of the peripheral edge of the transparent disk.