JPH09196604A - Clearance gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve measuring accuracy of a circular clearance dimension by making a surface flat contacting an inside and a surface curved contacting an outside. SOLUTION: A surface 11 contacting the side of an inner cylinder 3 is made flat and a surface 12 contacting the side of an outer cylinder 2 curved to be given the shape of a shaft bar inclined to the surface 11 at a fixed angle of inclination along the length thereof. A graduation is carved in the surface 12. The surface 11 is inserted into the surface of the inner cylinder 3 in contact therewith. This eliminates the need for inclined insertion of the surface and enables accurately reading of the dimension of the circular clearance 4 by using the graduation of the surface 12.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a clearance gauge for measuring an annular clearance dimension.

[0002]

2. Description of the Related Art A molding die for molding a tubular product such as a synthetic resin pipe is provided with an annular gap formed by an outer cylinder and an inner cylinder inserted into the outer cylinder on the outlet side. The molten synthetic resin is extruded and molded from the annular gap. Conventionally, a gap gauge used to measure the annular gap size as described above is, for example, as shown in FIG. 5, a shaft rod having a circular cross section which is tapered in the length direction and has an outer peripheral surface. It is known that the scale is engraved on it. The smaller diameter of the gap gauge 1A is inserted into the annular gap with the tip facing toward the tip, and the scale marked on the outer peripheral surface is read when the gap gauge is locked in the annular gap to measure the gap size. .

[0003]

However, the above-mentioned conventional gap gauge 1A has a problem that a reading error occurs when it is inserted at an inclination, as shown in FIG. 6 (a), and is shown in FIG. 6 (b). As described above, when the inner cylinder 3 is projected from the outer cylinder 2, the gap gauge 1A can be inserted only by inclining it obliquely, and in this case, there is a problem that a reading error occurs.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a gap gauge in which a reading error is unlikely to occur.

[0005]

The present invention has been made in order to achieve the above object, and the gap gauge of the present invention has an axial rod shape which is inserted into an annular gap to measure the size of the gap. The surface in contact with the inside of the gap is formed into a flat surface, and the surface in contact with the outside is formed into a curved surface inclined at a constant inclination angle in the longitudinal direction with respect to the inside surface, and a scale is engraved on the curved surface. There is something.

(Operation) In the clearance gauge of the present invention, the surface in contact with the inside of the clearance is formed into a flat surface, and the surface in contact with the outside of the clearance is a curved surface inclined at a constant inclination angle in the longitudinal direction with respect to the inside surface. Since it is formed and the scale is engraved on this curved surface, if the inner surface formed by the plane of the gap gauge is inserted by abutting it inside the annular gap, it will not be inserted at an angle, The annular clearance dimension can be read. Even when the inner cylinder is protruding from the outer cylinder, if the inner surface formed by the flat surface of the gap gauge is inserted into contact with the surface of the inner cylinder, the gap gauge can be inserted straightly and the annular gap dimension can be accurately measured. I can read it.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of the present invention,
FIG. 1 is a perspective view of the gap gauge, and FIG. 2 is a perspective view showing a usage state of the gap gauge of FIG. 3 and 4 are other examples of use of the gap gauge shown in FIG. 1, FIG. 3 is a plan view of a cylindrical pipe forming apparatus, and FIG. 4 is a cross-sectional view taken along line AA of FIG. is there. 5 is a perspective view of a conventional gap gauge, and FIG. 6 is a cross-sectional view showing a usage state of the gap gauge of FIG. 1 is a gap gauge, 11 is a surface contacting the inside of the gap, 12 is a surface contacting the outside of the gap, 13 is a scale, 2
Is an outer cylinder, 3 is an inner cylinder, and 4 is an annular gap.

First, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The gap gauge 1 of this embodiment is an outer cylinder 2
And the inner cylinder 3 inserted into the outer cylinder 2 is inserted into the annular clearance 4 to measure the clearance dimension. The gap gauge 1 is formed into a shaft rod shape, a surface 11 contacting the inner cylinder 3 side is formed into a flat surface, and a surface 12 contacting the outer cylinder 2 side is formed into a curved surface, and the surface 11 has a constant inclination in the longitudinal direction. Inclined at an angle. A scale 13 is engraved on the curved surface 12. 14 is a handle.

When the flat surface 11 of the clearance gauge 1 is inserted into the surface of the inner cylinder 3, the clearance gauge 1 is not tilted and the dimension of the annular clearance 4 can be read accurately. . Further, even when the inner cylinder 3 projects from the outer cylinder 2, the surface 11 formed by the plane of the gap gauge 1
By contacting the surface of the inner cylinder 3 and inserting it, the clearance gauge 1 can be inserted straightly, and the size of the annular clearance 4 can be read accurately.

Next, the gap gauge 1 shown in the above embodiment.
Another example of use of will be described with reference to FIGS. 3 and 4. FIG.
FIG. 3 is a plan view of a cylindrical pipe forming apparatus, in which a plurality of split outer cylinders 21 and 22 are connected, arranged in a track shape, and rotationally driven. Inside the track shape, the outer cylinders 21 and 22 are split in half.
Are fitted as shown in FIG. 4, and the fitted outer cylinder 2
The inner cylinder 31 whose one end is supported is inserted into the insides 1 and 22 to form the annular gap 41.

When, for example, a foaming urethane resin liquid is injected into the annular gap 41 of the molding apparatus and the outer cylinders 21 and 22 are driven to rotate, the outer pipes 21 and 22 are simultaneously foamed and hardened in the annular gap 41 to form a foam pipe It can be continuously molded.

In the above molding apparatus, in order to mold a pipe having a uniform thickness, it is necessary to make the annular gap 41 uniform on the circumference of each of the combined outer cylinders 21 and 22. . Therefore, the matched outer cylinder 2
One set of Nos. 1 and 22 is sequentially removed as shown in FIG. 3, the gap gauge 1 is inserted into the annular gap 41, the dimension of the annular gap 41 is measured, and the dimension is adjusted to be uniform on the circumference. To do.

At this time, even if the inner cylinder 31 projects from the outer cylinders 21 and 22, the surface 11 formed by the plane of the gap gauge 1 is formed.
When it comes into contact with the surface of the inner cylinder 31 and is inserted, the gap gauge 1
Since it can be inserted straight, the dimension of the annular gap 41 can be accurately read.

[0014]

INDUSTRIAL APPLICABILITY The gap gauge of the present invention is convenient because it has a flat inner surface and a curved outer surface. Also,
When the plane formed by the plane of the gap gauge of the present invention is inserted into the inside of the annular gap by abutting it, it is not inserted at an angle, and the measurement accuracy of the annular gap dimension is improved. Furthermore, even when the inner cylinder is protruding from the outer cylinder, if the surface formed by the flat surface of the gap gauge is inserted into contact with the surface of the inner cylinder, the gap gauge can be inserted straightly, and the measurement accuracy of the annular gap dimension can be improved. improves.

[Brief description of drawings]

FIG. 1 is a perspective view of a gap gauge according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a usage state of the gap gauge shown in FIG.

FIG. 3 is a plan view of another example of use of the gap gauge shown in FIG. 1, which is a cylindrical pipe forming apparatus.

FIG. 4 is a cross-sectional view taken along line AA of FIG.

FIG. 5 is a perspective view of a conventional gap gauge.

FIG. 6 is a cross-sectional view showing a usage state of the gap gauge of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gap gauge 11 Surface contacting the inside of the clearance 12 Surface contacting the outside of the clearance 13 Scales 2, 21, 22 Outer cylinder 3, 31 Inner cylinder 4, 41 Annular clearance

Claims (1)

[Claims] 1. An axial rod-shaped gap gauge that is inserted into an annular gap and measures the size of the gap, wherein a surface in contact with the inside of the gap is a flat surface, and a surface in contact with the outside is the inside surface. On the other hand, a gap gauge formed on a curved surface that is inclined at a constant inclination angle in the longitudinal direction, and a scale is engraved on this curved surface.