JPS6011448Y2 - pore size measuring device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a measuring device for measuring pore diameter.

Traditionally, pore diameter measurements have generally been carried out using measuring instruments such as inner diameter gauges and calipers. The holes tend to be distorted depending on the device, making it difficult to obtain the correct hole diameter, and the measurement work is also complicated.

In order to eliminate this drawback, a measuring instrument has been devised in which a scale is carved on the outer circumferential surface of a cone to indicate the diameter of a circular cross section that is uniformly removed along the axial direction. The measuring device is inserted into the hole in the axial direction, and the measurement is made by reading the scale on the outer peripheral surface of the measuring device that comes into contact with the periphery of the opening end of the hole.

However, with this device, if the axes of the measuring instrument and the hole are aligned accurately, the hole can be held in a perfect circle on the outer circumferential surface of the measuring instrument and measurements can be made, but if the axes of both are misaligned, Since the opening end of the hole is distorted into an elliptical shape, accurate measurement cannot be performed, and since the alignment of the axes is done by visual estimation, there is also a drawback that errors are likely to occur in measurement.

Also, for example, as shown in Figures 1 and 2 of Utility Model Application No. 52-18067, the end surface of the main body of the measuring instrument is brought into contact with the periphery of the hole in the object to be measured, and the axis of the hole is aligned. Some have been made to match.

However, with this device, the end surface of the measuring instrument can be brought into contact with the surface of the plate material for holes drilled in the plate material, but for pipes with an outer diameter smaller than the maximum diameter of the conical gauge part, the end surface of the measuring instrument can be placed on the end surface of the pipe. Since the end face of the main body of the vessel cannot be brought into contact with the other, accurate measurement of the hole diameter is not possible.

That is, there is a problem in that the measurable pore diameter is essentially limited by the outer diameter dimension.

This invention was made in view of such conventional problems,
It is an object of the present invention to provide a pore diameter measuring device that can measure pore diameters with high precision even in pipe materials etc. without being restricted by the outer diameter dimensions.

The present invention will be described in detail below based on embodiments shown in the drawings.

A hole diameter measuring device 1 according to the present invention shown in FIG. 1 includes a main scale 2,
It is composed of a vernier scale 3 that is slidably engaged with the main scale 2.

The main scale 2 has a truncated cone-shaped head portion 21 and a rod portion 22 extending in the axial direction from the non-pointed end surface of the head portion 21. A pair of split grooves 21a are bored along the axial direction, and the rod portion 22
A main scale 22a indicating the hole diameter is engraved along the axial direction on a chamfered portion of the round bar material.

The vernier scale 3 is slidably engaged with the split groove 21a of the head part 21 of the main scale, and has a jaw part 31 and a rod part 22 of the main scale 2. a gripping portion 32 that freely slides and engages with the arc groove 32a;
It is formed by a pair of presser plates 33 and 34 screwed to both sides of the gripping portion 32 across the arcuate groove 32a.

A sub scale 33a is engraved on the upper presser plate 33 in the figure in contact with the main scale 22a marked on the rod portion 22, and the lower presser plate 34 has a protrusion that protrudes in an arc shape downward from the rear end in the figure. 34a, and the curved surface of the protrusion 34a is notched to have an anti-slip function.

The holding plates 33 and 34 have opposing side edges chamfered in a tapered shape, and are attached so as to protrude from the chamfered side of the rod portion 22, so that the rod portion 22 and the gripping portion 32
It regulates the rotation relative to the

The main scale 22a and the sub scale 33a are marked with the following relationship.

That is, the main scale 22a is located at a position where the diameter of the circular cross section of the head portion 21 including the distal end surface of the jaw portion 31 corresponds to the scale line h (hereinafter referred to as reference scale line a) at the left end of the sub scale 33a in the figure. It is a mark.

For example, in the illustrated example, the diameter C of the outer surface of the head portion 21 is formed to increase from the minimum value 2orlrIt of the left end surface in the right direction at an increasing rate of 1110 with respect to the axial length.

The main scale 22a has a scale line b (hereinafter referred to as the reference scale line) at the left end in the figure indicating 20 (辽:) corresponding to the diameter of the tip surface of the head portion 21, and a scale carved at intervals of one scale of actual length. One graduation on the line corresponds to 0.1 mm of the hole diameter.

On the other hand, when the sub scale 33a is aligned with the distal end surface of the jaw part 31 and the distal end surface of the head part 21, the reference scale line a is the main scale 2.
Marked to match the reference scale line of 2a, 1.9m
Ten scale lines are shown at m intervals.

Next, a method for measuring the pore diameter using the measuring instrument 1 having such a configuration will be explained.

A main head portion 21 is inserted into the hole 4a from the open end of the hose-shaped object to be measured 4 made of a flexible material such as rubber, and the outer circumferential surface of the head portion 21 is brought into contact with the periphery of the open end of the hole 4a. In this state, the vernier 3 is positioned at a position where the tip end surface of the jaw portion 31 comes into contact with the open end surface of the object 4 to be measured.

At this time, the display on the main scale 22a corresponding to the reference scale line a of the subscale 33a is read in the same manner as with a general caliper.

That is, in the illustrated case, the reference scale line a of the sub scale 33a coincides with the second scale line from the reference scale line of the main scale 22a (however, the reference scale line is 0th), In this case, the hole diameter of the object to be measured 4 is 20 (mm) +20X1/10 C7rgIL)
It is measured as =22 (kaku).

If the reference scale line a is deviated from the scale of the main scale 22a as shown in FIG.
(mm), then read the scale line of the sub scale 33a that matches the scale line of the main scale 22a, and set the hole diameter to 1〇〇CrIr! Measure to the nearest [rL] unit.

That is, 1.9rIrI! Subscale 33a marked at L intervals
1 scale is 0.1m for the main scale marked at 1 interval.
The reference scale line a of the subscale 33a
When the X-th scale line from X (however, the reference scale line a is set to 0th) matches the scale line of the main scale, the reference scale line a is 0. A deviation of IXxmm will occur.

Therefore, the measured pore diameter in the case shown in Figure 2 is: 20 (mm) + 24X1/10 (耽) + 〇, 1x
It is measured as 3xi/10 (snow) = 22.43 (familiarity).

In the configuration according to the present invention, the jaw part 31 is fitted into the split 121a to a position deeper than the minimum diameter of the head part 21, so even if the hole diameter is within the measurement range of this measuring instrument, For example, no matter how thin the tube is, it will not work properly.
The hole diameter can be accurately measured by bringing one end into contact with the end of the tube.

In addition, if the head part and rod part of the main scale are configured to be freely attachable and detachable by screwing, etc., the measurement range of hole diameter can be increased by simply replacing the head part, which has a different measurement tolerance determined by the minimum diameter and maximum diameter. It has excellent cost advantages.

Further, the head portion may be formed of a solid member, but it may also be formed by closing the openings at both ends of a hollow member with disks, which leads to weight reduction and cost reduction.

As explained above, if the measuring instrument according to the present invention is used, the conical head of the main scale can be aligned with the tip face perpendicular to the axis of the vernier and the axis of the hole in the object to be measured. Because it can be inserted into the hole with the axes aligned by contact with the opening end surface,
Measurements can be made by keeping the hole perfectly circular, even on objects to be measured made of flexible material, or even thin-walled tubes with hole diameters within the measurement range. By setting the increase rate to the axial length of 1 or less, extremely high measurement accuracy can be obtained with the main scale marked several times larger than the actual size and the subscale marked on the vernier scale. .

In addition, the measuring operation can be performed very easily like a conventional caliper, and since the scale portion is separated from the measuring section, the measured values are easy to read and misreading is less likely to occur.

[Brief explanation of the drawing]

FIGS. 1A, B, and C are a left side view, a front view, a right side view, and a second
The figure is a front view of the main part showing the state when another hole diameter is measured with the same measuring device. 1...Measuring instrument, 2...Main scale, 3...
...Vernier measure, 21...Head part, 21a...
...Split groove, 22...Rod part, 22a...
...Main scale, 31...Jo part, 32...
...Grip part, 33a...Subscale.

Claims (2)

[Scope of utility model registration request] (1) A main scale including a conical or truncated conical head portion, a rod portion axially connected to the large-diameter end of the head portion, and a plurality of rods formed in the axial direction on the peripheral wall of the head portion. Slide freely into the groove to a depth close to the minimum diameter of the head,
The small-diameter side of the head has a jaw portion formed of a plurality of plates formed at right angles to the fine details of the head portion, and a jaw portion that is connected to the jaw portion and is freely slidable in the axial direction on the main rod portion. The head of the main scale is inserted into the hole of the object to be measured, and with the outer peripheral surface of the head in contact with the periphery of the opening end of the hole, the tip of the jaw part is is brought into contact with the open end surface of the object to be measured, and the relative sliding amount between the main scale and the vernier scale is determined by the main scale formed on one of the rod part of the main scale and the vernier scale, and the sub scale formed on the other. A pore diameter measuring device characterized in that it measures the pore diameter of an object to be measured. (2) The pore size measuring device according to claim 1, which is a registered utility model, in which the main scale has a head portion and a portion 071 that are freely attachable and detachable.