JP2011089889A - Tool and method for measuring micrometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-scale measuring tool for accurately and easily measuring the longitudinal size of a long object with a micrometer by oneself. <P>SOLUTION: The measuring tool for micrometers includes: a frame; an anvil having a measuring surface to be contacted with one end face in the longitudinal direction of a long object and disposed at one end of the frame; and a spindle having a measuring surface to be contacted with the other end face in the longitudinal direction of the long object and disposed at the other end of the frame to move forward or backward with respect to the direction of the anvil according to the operation of a thimble. The measuring tool for micrometers measures the longitudinal size of the long object by sandwiching the long object between the anvil and spindle, is fixed to the peripheral surface of the anvil and includes a holding member for holding one end in the longitudinal direction of the long object with the one end face in the longitudinal direction of the long object being in contact with the measuring surface of the anvil. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a micrometer measurement jig and a micrometer measurement method.

  In general, an outside micrometer (hereinafter, simply referred to as “micrometer”) is an instrument for accurately measuring the external dimensions of an object to be measured, such as an anvil at one end of a semicircular arc frame, and the like. In a state in which the object to be measured is sandwiched between the spindle that is movable in the direction of the anvil at the end, the measurer reads the external dimension of the object to be measured from the relative position of the spindle with respect to the frame. Because of this structure, for example, when the frame expands and contracts due to the influence of the surrounding temperature, the distance between the anvils and the spindles arranged at both ends of the frame also changes. When measuring the outer diameter of an object precisely, calibration is performed before the measurement.

  For example, when calibrating a large micrometer for measuring the longitudinal dimension of a long object, with the anvil and spindle separated by a predetermined distance, the measurement result matches the predetermined distance. The correlation between the relative position of the spindle with respect to the frame and the measurement result is adjusted. In order to separate the anvil and the spindle by a predetermined distance, for example, a reference rod whose longitudinal dimension is hardly affected by temperature change is used. However, when the length of the reference rod is, for example, about several hundred mm to 1,000 mm, it is difficult for one operator to hold the reference rod between the anvil and the spindle at the time of calibration. As shown in Fig. 2, another assistant who assists the measurer is required. FIG. 2 is a schematic diagram showing the positional relationship between the micrometer 1 and the hands of a measurer and an assistant who calibrate the micrometer 1.

  A micrometer 1 illustrated in FIG. 6 includes a frame 11, an anvil 12 disposed at an end 11a of the frame 11, a spindle 13 disposed at an end 11b of the frame 11, and a device under test. A sleeve 14 on which a large scale indicating the measured value is displayed, a small scale indicating the measured value of the object to be measured, a thimble 15 for moving the spindle 13 forward or backward in the direction of the anvil 12, and the reference rod 2 A ratchet 16 for adjusting the contact pressure of the measuring surface 13b of the spindle 13 with respect to the end surface 2b of the spindle and a clamp 17 for fixing the relative position of the spindle 13 with respect to the frame 11 are provided. In addition, a portion of the reference rod 2 illustrated in FIG. 6 that is gripped by the measurer and the assistant is covered with a heat insulating member 21 for suppressing the propagation of the body temperature and maintaining the temperature of the reference rod 2 constant. . An axis A in the figure indicates an axis connecting the center of the measuring surface 12a of the anvil 12 and the center of the measuring surface 13b of the spindle 13, and the axis A 'in the figure indicates both end faces 2a, 2b of the reference rod 2. An axis line connecting the centers of each other is shown.

  As a specific example of the calibration procedure, as illustrated in FIG. 6, the assistant has an axis A and an axis A ′ parallel to each other on the anvil 12 side, and the measurement surface 12 a of the anvil 12 and the end surface 2 a of the reference bar 2 are The reference | standard stick | rod 2 is hold | maintained through the heat insulation member 21 so that it may contact | abut (refer the insertion figure of the paper surface center part of FIG. 6). On the other hand, as illustrated in the figure, the measurer holds the thimble 15 while holding the reference rod 2 via the heat insulating member 21 so that the axis A and the axis A ′ are parallel on the spindle 13 side. By operating, the measurement surface 13b of the spindle 13 is brought into contact with the end surface 2b of the reference rod 2, and in this state, the value indicated by the large scale of the sleeve 14 and the value indicated by the small scale of the thimble 15 are read (lower part of the page of FIG. 6). (See the inset for.) Finally, the measurer adjusts the large scale of the sleeve 14 so that the above-described reading matches the nominal value of the reference bar 2.

  A micrometer stand (not shown) is known as a measurement jig that enables calibration and measurement by only one measurer for the above-described calibration method that requires two measurers and assistants. (For example, refer nonpatent literature 1). The micrometer stand includes a table on which the end 11a of the frame 11 of the micrometer 1 on the anvil 12 side is placed, a clamp that fixes the frame 11 at, for example, the center thereof, and the clamp held at a predetermined height from the table. And a support bar erected on the table. Since the measurer can fix the micrometer 1 in a substantially vertical direction with the measurement surface 12a of the anvil 12 facing upward with respect to the micrometer stand, the upper side of the micrometer stand is not required by the assistant. It is possible to measure the size of the reference bar 2 while supporting the reference bar 2 with one hand so that the end surface 2a of the reference bar 2 is in contact with the measurement surface 12a of the anvil 12 facing the front.

Mitutoyo Precision Measuring Instruments, General Catalog, p.101, [online], Mitutoyo Corporation, [March 16, 2009 Search], Internet <URL: http://www.mitutoyo.co.jp/products/micrometer /accessory.pdf>

  In the case of the calibration method illustrated in FIG. 6 described above, since two persons, a measurer and an assistant, are required for accurate measurement of the reference rod 2, this method makes it difficult to calibrate the micrometer 1. There is a problem of making it.

  On the other hand, in the case of the calibration method using the micrometer stand disclosed in Non-Patent Document 1 described above, measurement by only one measurer is possible, but if the micrometer 1 to be calibrated is larger. In this case, the micrometer stand must be enlarged according to the size. For this reason, when it is going to respond | correspond to the micrometer 1 from which a magnitude | size differs, there exists a problem that a measurement jig | tool becomes bulky and expensive. In addition, since the measurer needs to support and place one end of the reference rod 2 on the measurement surface 12a of the anvil 12 while manipulating the reference rod 2 with one hand, the end surface 2a and the measurement surface 12a of the anvil 12 are brought into contact with each other accurately. There is also a problem that it is difficult.

  The above is not limited to the calibration of the micrometer 1, and generally the same problem occurs when the longitudinal dimension of a long object is precisely measured with the micrometer 1.

  The present invention has been made in view of such a problem, and the object of the present invention is to make a small-sized measurement that enables a single person to accurately and easily measure the longitudinal dimension of a long object using a micrometer. To provide a jig.

  The invention for solving the above-mentioned problems has a frame, a measurement surface that comes into contact with one end surface in the longitudinal direction of the long object, an anvil disposed at one end of the frame, and a longitudinal direction of the long object. And a spindle disposed at the other end of the frame to move forward or backward with respect to the direction of the anvil according to the operation of the thimble. A measuring jig of a micrometer for measuring a longitudinal dimension of the long object by being sandwiched between the anvil and the spindle, the jig being fixed to a peripheral surface of the anvil, and a longitudinal direction of the long object A holding member that holds the one end portion in the longitudinal direction of the long object while bringing the one end surface of the long object into contact with the measurement surface of the anvil.

  According to the measurement jig of this micrometer, since the holding member is fixed to the peripheral surface of the anvil, for example, if the size of the anvil does not change even if the frame becomes larger, what is an increase in the size of the micrometer? Regardless, a holding member having a certain size can be applied. That is, this leads to downsizing of the measuring jig. In addition, the holding member holds the long object so that one end surface in the longitudinal direction of the long object is in contact with the measurement surface of the anvil, so that one measurer can hold only the other end of the long object, for example. While holding with one hand, the spindle is advanced in the direction of the anvil to measure the same long object with the other hand, so that both end surfaces of the long object and both measurement surfaces of the anvil and spindle are brought into contact with each other. Can be made. That is, the dimension in the longitudinal direction of the long object can be measured accurately and easily by only one measurer. From the above, it is possible to provide a small measuring jig for enabling a single person to accurately and easily measure the longitudinal dimension of a long object using a micrometer.

Further, in the measurement jig of the micrometer, the holding member has a hole portion into which the anvil is inserted, and a ring member fixed so that a measurement surface of the anvil protrudes, and the ring member from the ring member It is preferable to have a mounting member that extends in the direction of the measurement surface of the anvil and on which one end in the longitudinal direction of the long object is mounted.
According to the measuring jig of this micrometer, the holding member can be fixed to the peripheral surface of the anvil by fitting the ring member through the hole to the anvil, while the holding member is removed from the anvil by, for example, the reverse operation. You can also. Thereby, for example, by preparing in advance a plurality of holding members corresponding to the shape of the anvil, the shape of the long member, etc., it is possible to deal with various micrometers and long objects. In addition, since the measurement surface of the anvil protrudes from the ring member in a state where the holding member is fixed to the anvil, one end in the longitudinal direction of the long object can be easily brought into contact with the measurement surface. Furthermore, since the mounting member extends from the ring member in the direction of the measurement surface of the anvil, one end in the longitudinal direction of the long object can be easily mounted on the mounting member.

Further, in the measurement jig of the micrometer, the ring member has a screw hole penetrating toward the peripheral surface of the anvil, and the holding member is configured so that the butterfly screw is screwed into the screw hole. It is preferable to be fixed to the peripheral surface of the anvil.
According to the measurement jig of this micrometer, the holding member can be securely fixed to the peripheral surface of the anvil by screwing the butterfly screw into the screw hole of the ring member, while the screw is released by loosening the butterfly screw. By doing so, the holding member can be removed from the anvil. That is, the holding member can be more easily attached to and detached from the peripheral surface of the anvil. Therefore, the measurer can measure the longitudinal dimension of the long object accurately and easily by one person, for example, by carrying only this holding member and attaching it to the micrometer as necessary.

In the measurement jig of the micrometer, it is preferable that the mounting member extends from the ring member so that a center axis of the long object substantially coincides with a center axis of the anvil.
According to the measurement jig of this micrometer, the above-mentioned one measurer places one end in the longitudinal direction of the long object on the mounting member, so that the center axis of the long object and the center of the anvil The axis can be easily made substantially coincident. Thereby, the dimension of the longitudinal direction of the central axis of a long thing can be measured correctly and easily.

Further, the invention for solving the above-mentioned problems includes a frame, an anvil disposed at one end of the frame, the measurement surface abutting on one end surface in the longitudinal direction of the long object, and the long object. A spindle having a measuring surface that abuts the other end surface in the longitudinal direction, and a spindle disposed at the other end of the frame so as to move forward or backward relative to the direction of the anvil according to the operation of the thimble. A measuring method of a micrometer for measuring a longitudinal dimension of the long object by sandwiching an object between the anvil and the spindle, and measuring the longitudinal dimension of the elongated object, In a state where the one end surface in the longitudinal direction of the long object is brought into contact with the measurement surface of the anvil and the one end portion in the longitudinal direction of the long object is held by a holding member fixed to the peripheral surface of the anvil. The length of the long object To abut against the other end face of the direction to the measuring surface of the spindle.
According to this micrometer measurement method, a measurer can accurately and easily measure the longitudinal dimension of a long object by one person using the micrometer.

  Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  ADVANTAGE OF THE INVENTION According to this invention, the small-sized measurement jig | tool for enabling it to measure the dimension of the longitudinal direction of a long thing accurately and easily by one person with a micrometer can be provided.

It is a top view of the micrometer with which the measurement jig | tool of this Embodiment was mounted | worn. (A) is a top view of the measurement jig of FIG. 1, (b) is a side view of the measurement jig of FIG. 1, and (c) is a front view of the measurement jig of FIG. . It is a schematic diagram which shows the example of a calibration procedure of the micrometer using a measuring jig. It is another schematic diagram which shows the example of a calibration procedure of the micrometer using a measuring jig. It is a side view of another measuring jig of this embodiment. It is a schematic diagram which shows the positional relationship of a micrometer and the measurer and assistant's hand which calibrates the micrometer.

  At least the following matters will become apparent from the description of the present specification and the accompanying drawings.

=== Configuration of measurement jig ===
A configuration example of the measurement jig 3 used in the micrometer 1 of the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view of a micrometer 1 to which a measurement jig 3 of the present embodiment is attached. 2A is a plan view of the measurement jig 3 in FIG. 1, FIG. 2B is a side view of the measurement jig 3 in FIG. 1, and FIG. 3 is a front view of a measurement jig 3. FIG. Since the micrometer 1 illustrated in FIG. 1 is the same as the micrometer 1 illustrated in FIG. 6 described above, detailed description thereof is omitted.

  A measurement jig 3 illustrated in FIG. 1 is mounted on the micrometer 1 so that a guide groove 32a and a flat surface 32b, which will be described later, face upward. In the present embodiment, it is assumed that the micrometer 1 is used by being laid flat on a horizontal surface such as a work table. In the vertical direction (vertical direction) orthogonal to the horizontal plane, the front side of the drawing in FIG. 1 corresponds to the upper side, and the back side of the drawing corresponds to the lower side.

  Hereinafter, the reference direction when describing the configuration of the measuring jig 3 is such that the side on which a guide groove 32a and a flat surface 32b, which will be described later, are formed is on the upper side with respect to the micrometer 1 taking the posture described above. It is assumed that the vertical direction and the direction of the axis A in the state where the measurement jig 3 is mounted. Here, the axis A is an axis line connecting the center of the measurement surface 12 a of the anvil 12 of the micrometer 1 and the center of the measurement surface 13 b of the spindle 13.

  The measuring jig 3 of the present embodiment includes holding members 31 and 32. The holding members 31 and 32 include a ring member 31 and a mounting member 32, which will be described below.

  As illustrated in the insertion perspective view of FIG. 1 and FIG. 2, the ring member 31 is a ring-shaped member made of, for example, copper or resin. The ring member 31 of the present embodiment has a cylindrical shape that is coaxial with the axis A, and further has a hole 31a that is coaxial with the axis A.

  Further, as illustrated in FIG. 2B, the inner diameter of the hole 31 a is, for example, slightly larger than the outer diameter of the anvil 12 so that the ring member 31 fits into the round bar-shaped anvil 12 through the hole 31 a. The width in the direction of the axis A of the ring member 31 is the exposed length in the direction of the axis A of the anvil 12 from the end 11a of the frame 11 so that the measurement surface 12a of the anvil 12 protrudes from the ring member 31. It is getting smaller.

  Further, as illustrated in FIGS. 2B and 2C, the ring member 31 has a hole portion from, for example, the lower surface of the ring member 31 so as to be securely fixed to the peripheral surface of the anvil 12. A screw hole 31b is formed in a substantially vertical direction over the inner peripheral surface of 31a, and a predetermined screw thread is formed on the inner peripheral surface of the screw hole 31b to screw the butterfly screw 31c. With the hole 31 a of the ring member 31 fitted in the anvil 12, the ring member 31 is engaged with the anvil 12 by screwing the butterfly screw 31 c into the screw hole 31 b until its tip abuts against the peripheral surface of the anvil 12. Fixed.

  The mounting member 32 is a semi-cylindrical member made of, for example, copper or resin, as illustrated in the insertion perspective view of FIG. 1 and FIG. The mounting member 32 according to the present embodiment has a semi-cylindrical shape composed of only a lower half of a virtual cylindrical shape that is coaxial and has the same diameter as the ring member 31 described above. A guide groove 32a is formed in the direction of the axis A on the flat surface 32b. The inner peripheral surface of the guide groove 32a of the present embodiment also has a semi-cylindrical shape coaxial with the mounting member 32, and the inner diameter R (FIG. 2B) is the outer diameter R of the reference rod 2 described later. For example, it is slightly larger than '(see Fig. 3).

  Further, in the insertion perspective view of FIG. 1 and the illustration of FIG. 2, the width of the mounting member 32 in the direction of the axis A is wider than the width of the ring member 31 in the same direction. The flat surface 32b extends in the direction of the axis A so that a later-described reference rod 2 can be easily placed with the flat surface 32b facing upward.

  The mounting member 32 of the present embodiment is integrally formed with the ring member 31 from the same cylindrical material.

=== Calibration procedure using measurement jig ===
The calibration procedure of the micrometer 1 using the measuring jig 3 having the above-described configuration will be described with reference to FIGS. 3 and 4. FIG. 3 is a schematic diagram showing an example of a calibration procedure of the micrometer 1 using the measuring jig 3, and FIG. 4 is another schematic diagram showing an example of the calibration procedure.

  First, as illustrated in FIG. 3, the measurer operates the thimble 15 of the micrometer 1 with, for example, the right hand while holding the spindle 13 side of the reference rod 2 via the heat insulating member 21 with the left hand. 13 is advanced in the direction of the anvil 12. Before performing this operation, as shown in the insertion cross-sectional view of FIG. 3, the measurer grips the spindle 13 side of the reference bar 2 in advance, and the anvil 12 side of the reference bar 2 is placed on the mounting member 32. The state of being placed in the guide groove 32a is maintained.

  Next, as illustrated in FIG. 4, the measurer operates the thimble 15 and the ratchet 16 with the right hand (not shown) while holding the spindle 13 side of the reference rod 2 via the heat insulating member 21 with the left hand. Then, the measurement surface 13b of the spindle 13 and the end surface 2b of the reference bar 2 are brought into contact with each other (see the insertion cross-sectional view on the right side of the paper in FIG. 4). In this state, the measurer reads the value indicated by the large scale of the sleeve 14 and the value indicated by the small scale of the thimble 15. At this time, on the anvil 12 side of the reference bar 2, the end surface 2a and the measurement surface 12a of the anvil 12 are in contact with each other (see the insertion cross-sectional view on the left side of FIG. 4).

Finally, the measurer adjusts the large scale of the sleeve 14 so that the above-described reading matches the nominal value of the reference bar 2. This adjustment is performed, for example, by adjusting a predetermined portion (not shown) of the sleeve 14 with a tool after the clamp 17 is tightened.
Note that the above is not limited to the calibration of the micrometer 1, and in general, the dimension in the longitudinal direction of a long object may be precisely measured by the micrometer 1.

  According to the measurement jig 3 and the measurement method using the measurement jig described above, the anvil 12 side of the reference bar 2 is located on the guide groove 32a of the mounting member 32 with respect to the measurement jig 3 as shown in FIG. Since one measuring person holds only the spindle 13 side of the reference bar 2 with the left hand, the spindle 13 is moved in the direction of the anvil 12 to measure the reference bar 2 with the right hand. You can move forward. Then, as in the state of FIG. 4 described above, one measurer can bring both end surfaces 2a and 2b of the reference rod 2 into contact with the measurement surfaces 12a and 13b of the anvil 12 and the spindle 13, respectively. . That is, since one person can maintain the straightness of the anvil 12 and the spindle 13 of the micrometer 1 by one person, the dimension in the longitudinal direction of the reference bar 2 can be accurately and easily measured by one person. Here, since this measuring jig 3 is fixed to the peripheral surface of the anvil 12 as illustrated in the insertion perspective view of FIG. 1, for example, even if the frame 11 of the micrometer 1 is large, the anvil 12. If the size does not change, a small measuring jig 3 can be applied.

  Further, according to this measuring jig 3, as shown in the insertion perspective view of FIG. 1 and FIG. 2, the measuring jig 3 is fitted into the hole 31a of the ring member 31 by attaching the anvil 12 thereto. The measuring jig 3 can also be removed from the anvil 12. That is, the measuring jig 3 can be easily attached to and detached from the peripheral surface of the anvil 12. Thereby, for example, a plurality of measurement jigs 3 corresponding to the shape of the anvil 12, the shape of the reference bar 2, etc. are prepared in advance, and the measurement jig 3 can be changed according to various micrometers 1 and reference bars 2. . Moreover, as illustrated in FIG. 2B, the measurement surface 12 a of the anvil 12 protrudes from the ring member 31 in a state where the measurement jig 3 is fixed to the anvil 12. The longitudinal end surface 2a of the reference rod 2 can be brought into contact with the measurement surface 12a while confirming the above.

  Further, according to this measuring jig 3, as shown in FIGS. 2B and 2C, the measuring jig 3 is fixed by tightening the butterfly screw 31b with respect to the screw hole 31c of the ring member 31. While the anvil 12 can be reliably fixed to the peripheral surface, the measuring jig 3 can be detached from the anvil 12 by loosening the butterfly screw 31b. That is, the measuring jig 3 can be more easily attached to and detached from the peripheral surface of the anvil 12. Therefore, the measurer can easily measure the reference rod 2 by one person, for example, by carrying only the measurement jig 3 and attaching it to the micrometer 1 as necessary.

  Further, according to this measuring jig 3, as illustrated in the insertion perspective view of FIG. 1 and FIG. 2, the width of the mounting member 32 in the direction of the axis A is larger than the width of the ring member 31 in the same direction. It is getting wider. As a result, the guide groove 32a and the flat surface 32b extend in the direction of the axis A to the extent that it is easy to place the reference rod 2 in the state of facing upward, so that the anvil 12 side of the reference rod 2 is placed on the same side. It can be easily placed on the member 32. Moreover, since the diameter R of the inner peripheral surface of the guide groove 32a provided in the mounting member 32 is slightly larger than the outer diameter R ′ of the reference rod 2, the anvil 12 side of the reference rod 2 becomes the guide groove 32a. Holds securely.

  Moreover, according to this measuring jig 3, as shown in FIG. 3 and FIG. 4, the measurer places the anvil 12 side of the reference rod 2 on the mounting member 32, whereby the reference rod 2 The axis A ′ of the anvil 12 and the axis A of the anvil 12 can be made to substantially coincide. Thereby, the dimension along the axis A ′ of the reference rod 2 can be measured accurately and easily. In the measurement jig 3 described above, assuming various reference rods 2, the diameter R of the inner peripheral surface of the guide groove 32 a provided in the mounting member 32 is made larger than the outer diameter R ′ of the reference rod 2. Although it was set slightly larger, by preparing in advance a plurality of measuring jigs 3 having the same R with respect to the reference rod 2 having various R ′, the axis A and the reference rod of the anvil 12 Since the two axes A ′ can coincide with each other, the length of the reference rod 2 in the direction of the axis A ′ can be measured with higher accuracy.

  Note that the measurement jig of the present embodiment is not limited to the configuration of the measurement jig 3 described above, and may include the configuration of the measurement jig 3 ′ illustrated in FIG. 5, for example. FIG. 5 is a side view of the measurement jig 3 ′.

  The measuring jig 3 ′ includes holding members 31 ′ and 32. Among these, the ring member 31 ′ does not include the screw hole 31b and the butterfly screw 31c of the ring member 31 described above, but will be described below. An O-ring mounting groove 31e and an O-ring 31e are provided. Of the members illustrated in FIG. 5, the same members as those illustrated in FIG. 2B described above are denoted by the same reference numerals and description thereof is omitted.

  As illustrated in FIG. 5, the ring member 31 ′ includes an O-ring mounting groove 31 e that is coaxial with the ring member 31 ′ and is provided on the inner peripheral surface of the hole 31 a. With the hole 31a of the ring member 31 ′ fitted into the anvil 12, the O-ring 31d attached to the O-ring attachment groove 31e tightens the peripheral surface of the anvil 12, whereby the measuring jig 3 is attached to the peripheral surface of the anvil 12. 'Is supposed to be fixed.

  The mounting member 32 of the present embodiment is integrally formed with the ring member 31 'from the same cylindrical material.

  According to the configuration of the measuring jig 3 ′ described above, the O-ring 31 d is in the state where the hole 31 a of the ring member 31 ′ is fitted in the anvil 12. The circumference is tightened. For this reason, the measurement jig 3 ′ can be reliably fixed to the peripheral surface of the anvil 12 simply by fitting it to the anvil 12. Further, since the rubber that is the material of the O-ring 31d is softer than the material of the anvil 12 described later, the measuring jig 3 'can be reliably fixed to the peripheral surface of the anvil 12 without damaging the peripheral surface of the anvil 12.

  Incidentally, according to the configuration of the measuring jigs 3, 3 'described above, copper, resin or the like is used as the material thereof, while steel or the like is used as the material of the anvil 12. Therefore, by using copper or resin having a hardness lower than that of steel as the material of the measuring jigs 3 and 3 ′, when the measuring jigs 3 and 3 ′ are fixed to the peripheral surface of the anvil 12, the peripheral surfaces are damaged. Can be prevented.

  The above-described embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention is changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  In the above-described embodiment, the measurement jig 3 is fixed to the peripheral surface of the anvil 12 by fitting the anvil 12 into the hole 31a formed in the ring member 31, but the present invention is not limited to this. Not a thing. For example, the holding member 3 may be fixed to the peripheral surface of the anvil 12 with a wire attached to the mounting member 32.

  In the above-described embodiment, the ring member 31 has a cylindrical shape, and the mounting member 32 has a semi-cylindrical shape composed of only a lower half of a virtual cylindrical shape that is coaxial and has the same diameter as the ring member 31. However, it is not limited to this. For example, the ring member 31 may have a prismatic shape, and the mounting member 32 may have a prismatic shape including only the lower half of a virtual prismatic shape that is the same shape as the ring member 31.

  In the above-described embodiment, the guide groove 32a is provided on the upper surface of the mounting member 32 in order to hold one end of the long object. However, the present invention is not limited to this. For example, the upper surface of the mounting member 32 may be left flat without providing the guide groove 32a.

  In the above-described embodiment, the butterfly screw 31c or the O-ring 31e is used to securely fix the holding member 3 to the peripheral surface of the anvil 12, but the present invention is not limited to this. For example, the measuring jig 3 may be fixed using screws or the like.

DESCRIPTION OF SYMBOLS 1 Micrometer 2 Reference | standard rod 2a, 2b End surface 3, 3 'Measuring jig 11 Frame 11a, 11b End part 12 Anvil 12a, 13b Measuring surface 13 Spindle 14 Sleeve 15 Thimble 16 Ratchet 17 Clamp 21 Thermal insulation member 31, 31' Ring member 31a hole 31b screw hole 31c butterfly screw 31d O-ring mounting groove 31e O-ring 32 mounting member 32a guide groove 32b flat surface

Claims (5)

The frame has a measurement surface that comes into contact with one end surface in the longitudinal direction of the long object, and has an anvil disposed at one end of the frame and a measurement surface that comes into contact with the other end surface in the longitudinal direction of the long object. And a spindle disposed at the other end of the frame to move forward or backward relative to the direction of the anvil according to the operation of the thimble, and sandwich the long object between the anvil and the spindle. A measuring jig of a micrometer for measuring the longitudinal dimension of the long object by
A holding member that is fixed to the peripheral surface of the anvil and holds the one end portion in the longitudinal direction of the long object while bringing the one end surface in the longitudinal direction of the elongated object into contact with the measurement surface of the anvil.
A measuring jig for a micrometer, comprising: The holding member is
A ring member having a hole into which the anvil is inserted and fixed so that a measurement surface of the anvil protrudes;
A mounting member that extends from the ring member in the direction of the measurement surface of the anvil and on which one end in the longitudinal direction of the long object is mounted;
The measurement jig for a micrometer according to claim 1, wherein: The ring member has a screw hole penetrating toward the peripheral surface of the anvil;
The measurement jig for a micrometer according to claim 2, wherein the holding member is fixed to the peripheral surface of the anvil when a butterfly screw is screwed into the screw hole. The micrometer measurement according to claim 2 or 3, wherein the mounting member extends from the ring member so that a central axis of the elongated object substantially coincides with a central axis of the anvil. jig. The frame has a measurement surface that comes into contact with one end surface in the longitudinal direction of the long object, and has an anvil disposed at one end of the frame and a measurement surface that comes into contact with the other end surface in the longitudinal direction of the long object. And a spindle disposed at the other end of the frame to move forward or backward relative to the direction of the anvil according to the operation of the thimble, and sandwich the long object between the anvil and the spindle. A measuring method of a micrometer for measuring the longitudinal dimension of the long object by:
When measuring the longitudinal dimension of the long object, the one end part of the long object in the longitudinal direction is brought into contact with the measurement surface of the anvil while the one end surface of the long object is in contact with the measurement surface of the anvil. A measurement method of a micrometer, wherein the other end surface in the longitudinal direction of the long object is brought into contact with the measurement surface of the spindle while being held by a holding member fixed around the anvil.

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