JPH07294241A - Inner and outer length measuring apparatus - Google Patents

Abstract

PURPOSE:To measure the inner length, outer length, width, thickness, etc., easily with high accuracy using a single measuring apparatus. CONSTITUTION:Inner and outer measuring pieces 3, 2 are attached to a measuring shaft 1 and a groove 4 for sinking the inner measuring piece 3 is made on a reference plane 5. Since the measuring surface of the inner measuring piece 3 is flush with that of the outer measuring piece 2, the error between the inner and outer measurements is theoretically zero. Furthermore, since the inner measuring piece 3 sinks into the groove 4 on the reference plane 5, the reference plane can be brought into tight contact with the measuring surface thus realizing quick and accurate setting and confirmation of zero point, i.e., a reference point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to measurement of positions, lengths, widths, diameters and the like of irregularities on inner and outer surfaces or planes.

[0002]

2. Description of the Related Art Conventionally, when measuring the position, length, width, etc. of an uneven portion or a hole, a depth measuring device as shown in FIG. 13 or an end of the depth measuring device as shown in FIG. The inside / outside combined measuring instrument, or the special-purpose calipers, micrometer, dial gauge, digital or analog type electronic measuring instrument, or three-dimensional measuring instrument for the purpose of measuring the width of the concave portion and the thickness of the convex portion only. Was used.

[0003]

[Problems to be Solved by the Invention] These have the following drawbacks. It is common to measure the distance from one end of the DUT to know the position of the concave and convex portions of the article,
The depth measuring instrument as shown in FIG. 13 can measure only L1 and L5 shown in FIG. 14, and a measuring instrument having an L-shaped measuring element as shown in FIG. 15 is often used. In this case L1, L
3, L5 is the inner measurement, using the F1 surface of the probe, L2,
L4 will be the outer measurement and will use the F2 plane. For this reason, the thickness C of the tracing stylus is subtracted, or if the measuring instrument has a scale, the scale is divided into two stages for the inside and outside, and therefore the error in the thickness of the tracing stylus and the error between the two scales. In addition, it was difficult to use because it was easy for the measurer to misread. In the case of the digital display type, it is necessary to preset or to obtain the measured value every time the inner measurement and the outer measurement are performed. For this reason, when measuring irregularities such as the inside of a cylinder, a sub-number measuring device is used to obtain the values of length L, width W, and thickness T, and it is extremely inconvenient to calculate the numerical values. There was a lack of reliability. In addition, even a three-dimensional measuring machine requires a special stylus, and it takes a lot of time to set up before measurement, which is poor in mobility. The present invention can overcome these drawbacks.

[0004]

Means for Solving the Problems An inner probe and an outer probe are provided at one end of a measuring shaft, and a groove into which the inner probe sinks is provided on a reference surface of a measuring instrument. It is an inner-outer length measuring device having the above-mentioned configuration.

[0005]

[Operation] The inner gauge head sinks into the groove provided on the reference surface of the measuring instrument, so that the outer gauge element and the reference surface of the measuring instrument adhere to each other to form a common reference point for the inner and outer sides, and the inner and outer lengths, diameters, and convexities Part thickness Measure the groove width, side hole position, etc.

[0006]

[Embodiment] In the present invention, as in Embodiment 1 of FIGS. 1 and 2, two measuring elements having parallel planes or parallel lines are overlapped with each other and are provided at one end of the measuring axis (1) at a right angle or a right angle direction. On the other hand, since there is a groove (4) provided on the reference surface (5) of the measuring instrument main body where the inner stylus (3) sinks, the outer stylus is measured as shown in FIG. 2 when confirming the setting of the base point. Face (2
The state in which a) is brought into close contact with the reference surface (5) of the measuring device body is the minimum value, that is, the base point, and the zero position. Moreover, this is also the zero position of the measuring surface (3a) of the inner probe at the same time, and the outer measuring surface (2a) and the inner measuring surface (3
Due to a) being completely coplanar or in line. In this way, it is possible to easily and surely set the base points in the two directions of the inside and the outside.

In actual measurement, as shown in FIG. 4, L1,
L3, L5, and L9 are measured using an inner probe, and L2, L4, and L10 are measured using an outer probe. Further, L6 and L8 are measured with the inner measuring element, and L7 and T1, T2 and W1 and W2 are measured with both the inner and outer measuring elements. Next, an example will be described. FIG. 4 shows the measurement state of W1. First, the L2 dimension is measured outside, then the L3 dimension is measured inside, and L2 is subtracted from L3 to obtain the value of W1.

When the measuring device is of the digital display type, if the measured value of L2 is set to zero, W1 is measured when L3 is measured.
The value of is directly digitally displayed.

Similarly, when T1 is measured, L1 and L2 are measured and the values are obtained, but in the case of a digital display type, the value of T1 is directly displayed in the same manner as the measurement of W1.

The present invention is particularly effective for digital measurement as described above.

When measuring the widths of the grooves such as W1 and W2 and the thicknesses such as T1 and T2, move the reference plane as shown in FIG. Positioning can be done freely by measuring or by rotating 90 degrees to the lateral position.

The main body of the measuring instrument is a direct-view digital display type in which a main scale as shown in FIGS. 1 and 2 is slid, a scale type or digital type depth gauge in FIG. 6, a scale type or digital rectilinear micrometer head in FIG. It can be attached to a depth micrometer, a dial gauge type and a pointer meter type shown in FIG. 8, a measuring instrument as shown in FIG.

The stylus is attached in a cross shape to the reference plane as shown in FIGS. 1 and 2, but the orientation can be freely changed as shown in FIG. 5 depending on the shape of the object to be measured.

FIG. 12 shows an example of the shape of the probe. Although the measurement surface can be changed to a line or a point, it is basically necessary to make the lengths Ha and Hb of FIG. 3 exactly the same.

The shape of the groove on the reference surface varies depending on the shape of the measuring element and the object to be measured, but it is desirable that the depth always has a slight margin, for example, about 0.5 mm, added to the thickness of the inner measuring element.

[Effects of the Invention] The length, outer diameter, position, width, thickness, etc. of the workpiece, product, groove on each part, holes on the side, protrusions, etc. can be easily and accurately measured with one measuring instrument. This is especially effective for measuring the inner surface of a small-diameter cylinder. Further, since the inner measuring surface and the outer measuring surface are completely on the same plane or on the same straight line, the error due to the measuring direction is theoretically zero. Also, when aligning the base points, the inner stylus sinks into the groove provided on the reference surface,
The reference surface and the outer measuring surface are in close contact with each other, and the 0 positions on both the inner and outer sides can be set instantaneously, and it is not necessary to calculate the thickness of the contact point from the measured value, which enables quick measurement work. Became.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a trihedral view of the first embodiment.

FIG. 3 is an explanatory diagram of features of the invention.

FIG. 4 is an explanatory diagram showing an example of a measuring method.

FIG. 5 is an explanatory diagram of a positional relationship between a tracing stylus and a reference plane of a measuring device main body.

FIG. 6 is a perspective view of a second embodiment.

FIG. 7 is a perspective view of a third embodiment.

FIG. 8 is a perspective view of a fourth embodiment.

FIG. 9 is a perspective view of a fifth embodiment.

FIG. 10 is an example of a shape in which a probe is a knife edge.

FIG. 11 is an example in which the probe is a sphere.

FIG. 12 is an example in which the probe is a cylinder.

FIG. 13 is an example of a conventional depth measuring instrument.

FIG. 14 is a diagram showing a measurement state of a depth measuring instrument having a conventional L-shaped measuring element.

FIG. 15 is an example of a conventional L-shaped probe.

[Explanation of symbols]

1 ... Measuring axis 2 ... Outer measuring element 2a ... Outer measuring surface 3 ... Inner measuring element 3a ... Inner measuring surface 4 ... Groove 5 ... Reference surface L1, L2, L3 , L4, L5, L6, L7, L8, L
9, L10 ... Length T1, T2 ... Thickness W1, W2 ... Width F1 ... Inner measuring surface of conventional stylus F2 ... Outer measuring surface of conventional stylus C ...・ Thickness of conventional measuring element Ha ・ ・ ・ Measured value on the inside Hb ・ ・ ・ Measured value on the outside

Claims (1)

[Claims] 1. An outer stylus (2) and an inner stylus (3) are provided at one end of the measuring shaft (1) in a direction perpendicular to the measuring shaft, and an inner stylus (3) is provided on a reference surface (5) of the measuring instrument. ) Is provided with a groove (4). Inner / outer length measuring device with the above configuration.