JP2002310601A - Dial gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dial gauge allowing a measurer to recognize present temperature. SOLUTION: In this dial gauge, a body case 1 is provided axially movably with a spindle 11, the movement displacement of the spindle 11 is converted into rotary motion of an indicator 31 via expansion mechanism, and a rotation angle position of the indicator 31 is read from graduations 33 provided in a scale plate 32 to measure size of a measured object. The dial gauge has temperature display graduations 34 provided correspondingly to the rotation angle position of the indicator 31, and angle intervals of the temperature display graduations 34 are set to angle intervals corresponding to an rotation angle, by which the indicator 31 rotates on the basis of relative displacement caused by the difference in thermal expansion between the body case 1 and the spindle 11, when the operating environment temperature changes by a prescribed temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dial gauge for measuring the thickness and height of an object to be measured. More specifically, the present invention relates to a dial gauge capable of easily displaying a use environment temperature.

[0002]

2. Description of the Related Art Dial gauges are known as measuring instruments for measuring the thickness and height of an object to be measured. In the conventional dial gauge, a spindle is provided in the main body case so as to be movable in the axial direction, the displacement of the spindle is converted into a rotational movement of a pointer via an enlargement mechanism, and the rotation angle position of the pointer is provided on a scale plate. This is a structure for measuring dimensions and the like of an object to be measured by reading from a scale.

[0003]

As to measuring instruments, the accuracy assurance temperature is determined by each manufacturer. However, even if each manufacturer has set the accuracy assurance temperature, for example, even if the dial gauge is set to 20 ° C., it cannot be said that the user always uses it in the measurement environment of 20 ° C. The user rarely uses the temperature of the measurement environment actually used, and does not care about it at all.

[0004] It is an object of the present invention to provide a dial gauge that enables a measurer to easily recognize a measurement environment temperature actually used in order to solve such a problem.

[0005]

For this purpose, the dial gauge of the present invention is provided with a spindle provided in a main body case so as to be movable in the axial direction, and converts the displacement of the spindle into a rotational movement of a pointer through an enlargement mechanism. A dial gauge for reading the rotation angle position of the pointer from a scale provided on a scale plate to measure the dimensions of the object to be measured is provided with a temperature display means for displaying a use environment temperature.

According to this configuration, since the temperature display means for displaying the use environment temperature is provided, the measurer can easily recognize how many measurement environment temperatures are actually used. As a result, if the use environment temperature deviates greatly from the accuracy assurance temperature, measurement at a place where the use environment temperature is close to the accuracy assurance temperature can be encouraged, so that highly accurate measurement can be performed. Here, the structure of the temperature display means is not limited as long as it can display the use environment temperature. For example, a display element whose color changes depending on the temperature may be used.

[0007] In the above, it is preferable that the temperature display means displays a use environment temperature when the spindle is in an initial position. Here, the initial position of the spindle means a position in a free state where no external force is applied to the spindle. With such a configuration, if the spindle is returned to the initial state after the measurement, the operating environment temperature is displayed, so that it is possible to confirm whether or not the temperature has changed during the measurement. By the way, if there is a temperature change during the continuation of the measurement, not only the accuracy of the dial gauge itself will change, but also the reliability of the zero point may be lost and serious negligence may be caused, but the spindle is returned to the initial state. These problems can be prevented by checking whether or not the temperature has changed during the measurement.

The temperature display means has a temperature display scale provided on the scale plate corresponding to the rotation angle position of the pointer. At this time, it is preferable that the angular interval is set to correspond to a rotation angle at which the pointer rotates based on a relative displacement due to a difference in thermal expansion between the main body case and the spindle. With such a configuration, it is possible to display the operating environment temperature simply by providing a temperature display scale in consideration of the difference in thermal expansion based on the material of the main body case and the spindle without adding a special mechanism. Because you can
Temperature display can be realized simply and inexpensively.

In this case, it is desirable that the temperature display scale is inscribed in units of 10 ° C. With such a configuration, that is, when the temperature display scale is in units of 10 ° C., it is not necessary to carve a very large number of scales, so that the scale can be easily formed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the front of the dial gauge of the present embodiment, and FIG. 2 shows the internal mechanism of the dial gauge. As shown in these figures, the dial gauge according to the present embodiment includes an annular main body case 1 and an axial direction through the main body case 1 via a stem 2.
A spindle 11 movably provided in the diameter direction of
A pointer 31 rotatably provided on the main body case 1; an enlarging mechanism 21 for enlarging the movement displacement of the spindle 11 to convert the movement into a rotational movement of the pointer 31; And a scale plate 32 for displaying the rotation angle position. 3 is a spindle 11
The caps 4A and 4B are caps that indicate the dimensional tolerance and the like.

The spindle 11 has a spherical contact 12 at a tip (lower end), an arm pin 13 and a guide pin 14 at an intermediate portion, and a stopper 15 at an upper end by a spring (not shown). Are urged in a direction (downward in the figure) in contact with the outer peripheral surface of. The guide pin 14 is housed in the guide groove 5 formed on the inner wall of the main body case 1 so as to be movable in the axial direction of the spindle 11. Therefore, the spindle 11 is provided so as to be non-rotatable and movable only in the axial direction.

The enlargement mechanism 21 comprises a sector gear 22 for increasing the amount of displacement of the spindle 11 and a gear train 26 for transmitting the swing of the sector gear 22 to the pointer 31. The sector gear 22 has a base end pivotally supported on the stem 2 side in the main body case 1 via a shaft 23, and a transmission pin 24 projecting from the base end in contact with the arm pin 13 of the spindle 11. And has a gear portion 25 at the tip. The gear train 26 includes a first gear 27 meshing with the gear portion 25 of the sector gear 22, and a sector-shaped second gear 28 fixed coaxially with the first gear 27.
With the second gear 28 and the hands 3
And a third gear 29 having a number one.

The scale plate 32 is engraved with a dimensional display scale 33 for displaying the rotation angle position of the pointer 31, that is, the amount of displacement of the spindle 11 at the time of measurement, and a temperature for displaying the use environment temperature inside the scale plate 32. A temperature display scale 34 as a display means is engraved in units of 10 ° C. The dimension display scale 33 is used to set the displacement of the spindle 11 to 1/1000 mm.
Engraved so that it can be read in units. Temperature display scale 3
The angular interval 4 is set to an angular interval corresponding to the rotation angle at which the pointer 31 rotates based on the relative displacement between the main body case 1 and the spindle 11 when the use environment temperature changes by a predetermined temperature.

[0014] Here, it is cut in units of 10 ° C over a temperature range of 0 ° C to 40 ° C. As a calculation formula, when the use environment temperature changes by a predetermined temperature, the relative displacement between the main body case 1 and the spindle 11 is (AB) × C × D, where A: thermal expansion coefficient of the main body case B: Thermal expansion coefficient of spindle C: Distance from upper surface of main body case to arm pin (m
m) D: temperature change (° C.), the rotation angle of the pointer 31 when the relative displacement is transmitted to the pointer 31 via the magnifying mechanism 21 is obtained, and the rotation angle is set as the angular interval of the scale 34. do it. Incidentally, the sizes of the scales according to the combination of the main body case 1, the spindle 11, and the material are as shown in Table 1.

[0015]

[Table 1]

Therefore, when measuring, the spindle 1
When the temperature display scale 34 indicated by the pointer 31 is read in an initial state, that is, in a state where the spindle 11 moves downward in FIGS. You can check the environmental temperature. At this time, if the use environment temperature is much larger than the accuracy assurance temperature, measurement at a place where the use environment temperature is close to the accuracy assurance temperature can be encouraged, so that highly accurate measurement can be performed. On the other hand, when the spindle 11 is brought into the initial state after the measurement, the operating environment temperature at that time can be confirmed. Therefore, it can also be confirmed whether or not the use environment temperature fluctuates greatly during the measurement.

According to the present embodiment, since the temperature display scale 34 for displaying the use environment temperature is provided, it is possible to inform the measurer of the current temperature. If the use environment temperature deviates greatly from the accuracy assurance temperature, measurement at a place where the use environment temperature is close to the accuracy assurance temperature can be encouraged, so that highly accurate measurement can be performed.

The angular interval of the temperature display scale 34 is the angular interval corresponding to the rotation angle of the pointer 31 based on the relative displacement between the main body case 1 and the spindle 11 when the use environment temperature changes by a predetermined temperature. Is set to
Without adding a special mechanism, simply by providing a temperature scale, it is possible to display the operating environment temperature,
Temperature display can be realized simply and inexpensively.

In addition, since the operating environment temperature is displayed when the spindle 11 is in the initial position, if the spindle 11 is returned to the initial state after the measurement, the operating environment temperature is displayed. Can be confirmed.
At this time, since the temperature display scale 34 is cut in units of 10 ° C., it is not necessary to cut too many scales, so that the scale can be easily formed.

The present invention is not limited to the dial gauge described in the above embodiment, but includes the following modifications. For example, the temperature display means may be of any structure as long as it can display the use environment temperature.

[0021]

According to the dial gauge of the present invention, the current temperature can be recognized by the measurer.

[Brief description of the drawings]

FIG. 1 is a diagram showing the front of a dial gauge according to an embodiment of the present invention.

FIG. 2 is a view showing a state where a scale plate and a cap of the embodiment are removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 11 Spindle 21 Magnification mechanism 31 Pointer 32 Scale plate 33 Dimension display scale 34 Temperature display scale

Continued on the front page F term (reference) 2F061 AA02 AA16 DD00 DD03 EE36 FF07 FF34 FF46 FF52 FF72 GG01 HH04 JJ00 JJ02 JJ51 JJ67 JJ84 SS02 SS16 SS24 SS26

Claims (4)

[Claims] A spindle is provided in a main body case so as to be movable in an axial direction, and a displacement of the spindle is converted into a rotational movement of a pointer via an enlargement mechanism, and a rotation angle position of the pointer is provided on a scale plate. What is claimed is: 1. A dial gauge for reading dimensions from a scale to measure the size of an object to be measured, wherein a temperature display means for displaying a use environment temperature is provided. 2. The dial gauge according to claim 1, wherein the temperature display means displays a use environment temperature when the spindle is in an initial position. 3. The dial gauge according to claim 2, wherein the temperature display means includes a temperature display scale provided on the scale plate corresponding to a rotation angle position of the pointer, and an angle of the temperature display scale. The interval is set to an angular interval corresponding to a rotation angle at which the pointer rotates based on a relative displacement due to a difference in thermal expansion between the main body case and the spindle when a use environment temperature changes by a predetermined temperature. And dial gauge. 4. The dial gauge according to claim 2, wherein the temperature display scale is inscribed in units of 10 ° C.