JP2008185358A - Flatness measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple, inexpensive and highly-accurate flatness measuring instrument. <P>SOLUTION: A dial gage 26 is mounted on a sliding block 25 mounted slidably between jaws 23, 24 of a caliper 21. The sliding block 25 comprises a block body 33 having a rectangular recessed groove 32 wherein a scale part 22 is stored slidably, and a pressing lid 34 for pressing the scale part 22 in the rectangular recessed groove 32. An elastic body, for example, a bent plate spring 38, is arranged between the under surface of the rectangular recessed groove 32 of the block body 33 and the under surface of the scale part 22, and a bent plate spring 39 is also arranged between a depth surface of the rectangular recessed groove 32 and the back surface of the scale part. Tilt in the caliper longitudinal direction of the sliding block and tilt in the scale part thickness direction can be prevented by the plate spring 38 on the under surface side of the scale part 22 and the plate spring 39 on the back surface side, and tilt of the dial gage 26 can be prevented, to thereby enable highly-accurate flatness measurement. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flatness measuring instrument for measuring the flatness of flat surfaces of, for example, rectangular steel pipes, lightweight steel shapes and other various objects.

  For measuring flatness, for example, a flatness measuring instrument (warp measuring instrument) 1 shown in FIG. 14 has a structure in which two legs 3 and 4 are attached to a support beam 2 to which a dial gauge 5 is attached. The thing is common (patent document 1). In the flatness measuring instrument 1, the two leg portions 3 and 4 can be moved and adjusted on the support beam 2, respectively, and the moved and adjusted leg portions 3 and 4 are fixed by screws 3a and 4a. Further, the dial gauge 5 is fixed to the support beam 2 passing through the through-hole formed in the mounting portion (T-shaped support 6) with a screw, and the position on the support beam 2 can be adjusted. it can. In addition, although it is set as the curvature measuring device which measures the curvature of the board | plate material 7 in patent document 1, it is substantially the same as the instrument which measures flatness.

  When measuring the warp of the plate material 7 with the measuring tool 1, the measuring tool 1 is placed on a horizontal plane (such as a surface plate) in advance, and zero-point adjustment is performed to set the dial gauge 5 to zero. And the curvature (flatness) of the board | plate material 7 can be measured by mounting this measuring tool 1 in the predetermined position of the to-be-measured board | plate material 7, and reading the scale of the dial gauge 5. FIG. In this case, the positions of the legs 3 and 4 are appropriately adjusted according to the warp to be measured, and the spindle (measurement element) 5a of the dial gauge 5 is positioned at the measurement point.

Further, the flatness measuring instrument (straightness measuring instrument) 11 shown in FIG. 15 has a meter holder 15 to which a reference straight ruler 12 is supported by support legs 13 on both sides and a dial gauge (pointer measuring instrument) 14 is attached. 16 is a structure that is slidably attached to the reference straight ruler 12 via a contact 17 as shown in FIG. A rectangular cylindrical carriage 16 for sliding the dial gauge 14 (sliding operation of the meter holder 15) is arranged so as to surround the meter holder 15, and a bearing (not shown) is arranged on the inner surface of the carriage 16. This is a structure in which a spring 18 is provided between the meter holder 15 and the carriage 16 as a gentle guide for the standard straight ruler 12 and between the meter holder 15 and the carriage 16 (Patent Document 2).
Japanese Patent Laid-Open No. 7-239202, FIG. 1, paragraph number [0007], etc. Japanese Patent Publication No. 6-23642, columns 5 and 6, FIG. 2 (a), FIG. 3 to FIG.

The conventional flatness measuring tool 1 shown in FIG. 14 is complicated because the movement of the legs 3 and 4 on both sides is necessary, and the workability of the measurement work is poor.
Further, when measuring the flatness at an arbitrary position between two points, it is further complicated to move and adjust the leg portions 3 and 4 on both sides. In this case, the dial gauge 5 can be moved and adjusted on the support beam 2 to measure the flatness at any position between the legs 3, 4 (between two points), but the support beam 2 is simply passed through the through hole. In the structure, since it is difficult to accurately maintain the height position of the dial gauge when the dial gauge 5 is slid (the mounting portion 6 is slid), the flatness measurement accuracy is low.

  The conventional flatness measuring tool 11 shown in FIGS. 15 and 16 can measure with high accuracy, but has a very complicated structure and is expensive, and is manufactured, for example, in an ERW steel pipe manufacturing facility. It is not appropriate when simple measurement is required, such as when used for flatness inspection of rectangular steel pipes.

  The present invention has been made to solve the above-described conventional drawbacks, and an object of the present invention is to provide a flatness measuring instrument that has a simple structure and can ensure a certain level of accuracy.

The present invention that solves the above problems is a flatness measuring instrument in which a sliding block is slidably attached between the jaws of the scale part of a caliper, and the stem part of the dial gauge is fixed vertically to the sliding block,
The sliding block has a block main body having a dial gauge mounting portion to which a dial gauge stem portion is attached and a groove in which a scale portion having a thin rectangular cross section is slidably received, and presses the scale portion in the groove. And a first elastic body disposed between the lower surface of the rectangular hole formed by the block body and the pressing lid and the lower surface of the scale portion. To do.

  According to a second aspect of the present invention, in the flatness measuring instrument according to the first aspect, the second elastic body is disposed between the back surface of the rectangular hole formed by the block body and the pressing lid and the back surface of the scale portion. To do.

  According to a third aspect of the present invention, in the flatness measuring instrument of the first aspect, the first elastic body is a leaf spring.

  According to a fourth aspect of the present invention, in the flatness measuring instrument according to the second aspect, the second elastic body is a leaf spring.

  According to a fifth aspect of the present invention, in the flatness measuring instrument according to any one of the first to fourth aspects, a stabilization block having a lower end surface aligned with a lower end of the jaw is attached to the back surface of the caliper jaw.

  According to a sixth aspect of the present invention, in the flatness measuring instrument according to the first to fifth aspects, a window is provided on the holding lid of the sliding block so that the caliper scale can be seen.

  A seventh aspect of the present invention is characterized in that the caliper in the flatness measuring instrument according to any one of the first to sixth aspects is obtained by removing the inner measuring beak portion and the depth measuring depth bar in the Mosel type caliper.

According to the present invention, since the dial gauge is attached to the sliding block that is slidably attached to the caliper scale portion having rigidity and high dimensional accuracy, the height position of the dial gauge is accurately determined when the dial gauge is moved. Therefore, the flatness measurement accuracy can be easily ensured.
In addition, since the first elastic body such as a curved leaf spring is disposed on the lower surface side of the scale portion and the slide block is pushed up, the height position of the slide block is based on the upper end surface of the scale portion. Therefore, when the dial gauge is moved, there is no fear that the height position of the sliding block will fluctuate due to the gap between the scale portion and the sliding block, and the dial gauge is moved to the scale portion by its weight. On the other hand, since there is no fear of descending and the sliding block does not tilt in the caliper longitudinal direction, the height position of the dial gauge can be accurately maintained in this respect, and high measurement accuracy can be secured.

  According to the second aspect, since the second elastic body, such as a curved leaf spring, is disposed between the back surface of the rectangular hole of the block body and the back surface of the scale portion, the sliding block has the second elasticity. The body is always urged to the back side against the scale part, and therefore the sliding block is prevented from tilting in the thickness direction of the scale part, and the height position of the dial gauge can be accurately maintained also in this respect, High measurement accuracy can be secured.

  As the first or second elastic body, it is appropriate to use a leaf spring as in claim 3 or claim 4 because the arrangement space is a narrow gap.

  According to the fifth aspect of the present invention, since the stabilizing block having the lower end face aligned with the lower end of the jaw is attached to the back surface of the caliper jaw, the caliper jaw keeps an upright posture in a state where the hand is released from the caliper. Measurement is easy.

  According to the sixth aspect, since the vernier caliper scale can be seen from the window of the holding lid of the sliding block, it is easy to correctly position the dial gauge at the measurement point, and the measurement operation is also easy in this respect.

  Hereinafter, embodiments of the flatness measuring tool of the present invention will be described with reference to FIGS.

  1 is a front view of a flatness measuring instrument 20 according to one embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a cross-sectional view taken along the line AA of FIG. In this flatness measuring instrument 20, a sliding block 25 is slidably attached between the jaws 23, 24 of the scale portion 22 of the caliper 21, and a stem portion 27 of the dial gauge 26 is fixed vertically to the sliding block 25. Structure. Reference numeral 28 denotes a slider slidably attached to the scale portion 22. The vernier is graduated and the lower portion is the one jaw 24. A curved leaf spring 30 is disposed on the upper end surface side of the scale portion 22. Reference numeral 36 denotes a set screw for fixing the slider 28. The vernier caliper 21 corresponds to a so-called Mosel type caliper capable of measuring inside / outside / depth measurement on the market, from which the inner measurement beak portion and the depth measurement depth bar are removed.

  The sliding block 25 has a block main body 33 having a dial gauge mounting portion 31 to which the stem portion 27 of the dial gauge 26 is mounted and a rectangular concave groove 32 in which the scale portion 22 having a thin rectangular section is slidably received. And a pressing cover 34 fixed to the front surface of the block main body 33 with screws 35 so as to press the scale portion 22 in the rectangular groove 32. The rectangular groove 32 of the block body 33 forms a part of a rectangular hole 50 formed by the rectangular groove 32 of the block body 33 and the inner surface of the pressing lid 34.

Between the lower surface 32a of the rectangular concave groove 32 of the block body 33 and the lower surface 22a of the scale portion 22, a first curved leaf spring as a first elastic body (hereinafter, sometimes a curved leaf spring on the lower surface side, or simply A curved plate spring 38 is disposed, and a second elastic body is provided between the back surface 32b of the rectangular groove 32 and the back surface of the scale portion 22 (that is, the surface opposite to the scale surface 22b) 22c. A curved leaf spring (hereinafter, sometimes referred to as a curved leaf spring on the back side or simply referred to as a curved leaf spring) 39 is disposed. Therefore, the sliding block 25 is urged downward (downward in FIG. 6) with respect to the scale portion 22 by the curved plate spring 38 on the lower surface side, and is also applied to the scale portion 22 by the curved plate spring 39 on the back side. And is biased to the rear side (left side in FIG. 6). Both leaf springs 38 and 39 are two leaf springs, and are effective for maintaining parallelism with the scale portion 22.
Reference numeral 40 denotes a set screw for moving and adjusting the sliding block 25 to a predetermined position and fixing it to that position. The holding lid 34 has a window 34a through which the scale surface 22b of the scale portion 22 can be seen, and a ruled line 34b is imprinted as a dial gauge center position indication mark at a position corresponding to the center position of the dial gauge 26. Yes.

The dial gauge mounting portion 31 is configured such that the stem portion 27 is fitted into a split cylindrical hole 33a matched to the stem portion 27 of the dial gauge 26, and the dial gauge is fixed to a caliper longitudinal screw hole 33c provided at the position of the split groove 33b. In this configuration, the stem portion 27 is fixed by screwing and tightening the working screw 41. With such a structure of the dial gauge mounting portion 31, the stem 27, that is, the dial gauge 26 is stably fixed to the block main body 33 without backlash, and measurement errors can be prevented from occurring.
Note that the dial gauge mounting portion is not limited to this configuration. For example, the dial gauge stem portion 27 of the dial gauge 26 is fitted into a simple through hole instead of a split cylindrical hole, and the set bolt is screwed and tightened toward the stem portion 27. The structure which fixes the stem part 27 with a set bolt, and another attachment means are employable. Reference numeral 29 denotes a spindle that contacts the measurement surface and moves up and down to detect flatness.

  The rear surfaces 23a and 24a of the jaws 23 and 24 of the caliper 21, that is, the surface on the side where the dial gauge 26 is offset from the scale portion 22 (the left surface in FIG. 3), the lower ends of the jaws 23 and 24 A stabilization block 43 aligned with the lower end is attached with a screw 44. With this stabilization block 43, the two jaws 23, 24 can be kept in an upright posture even if the hand is released from the caliper 21.

FIG. 10 shows a situation in which the flatness of the surface of the square steel pipe 47 is measured by the flatness measuring tool 20 described above.
For example, the two jaws 23 and 24 of the vernier caliper 21 are previously placed on a surface plate, for example, and zero point adjustment is performed to adjust the scale of the dial gauge 26 to zero.
Next, the slider 28 of the caliper 21 is moved and adjusted so that the distance S between the jaws 23 and 24 is set to the length of the range in which the flatness is to be measured. Next, the sliding block 25 is slid to place the dial gauge 26 at a desired position between the two jaws 23 and 24. At that time, the dial gauge 26 can be set at a desired position by looking at the scale 22b of the caliper 21 from the window 34a of the pressing lid 34 of the sliding block 25. In the illustrated example, the center position between the two jaws 23 and 24 is measured.
When the flatness measuring tool 20 is placed on the flat surface to be measured, the spindle 29 of the dial gauge 26 moves up and down according to the flatness of the surface, and the flatness is measured by reading the lift with the scale plate of the dial gauge 26. Can be detected.

According to the flatness measuring instrument 20 described above, the dial gauge 26 is attached to the sliding block 25 slidably attached to the scale portion 22 of the caliper 21 having high rigidity in the height direction and high dimensional accuracy. Compared with the conventional flatness measuring instrument 1 shown in FIG. 14, it is easy to accurately maintain the height position of the dial gauge 26 during the movement of the dial gauge 26, and thus high measurement accuracy can be ensured.
Further, since the curved leaf spring 38 is disposed on the lower surface side of the scale portion 22 and the sliding block 25 is pushed up, the height position of the sliding block 25 is determined with reference to the upper end surface of the scale portion 22. Therefore, when the dial gauge 26 is moved, there is no fear that the height position of the sliding block 25 will fluctuate due to the gap between the scale portion 22 and the sliding block 25, and the dial gauge 26 is scaled by its weight. There is no fear of descending with respect to the portion 22, and the sliding block 25 is not inclined in the caliper longitudinal direction, so that the height position of the dial gauge 26 can be accurately maintained in this respect as well, and high measurement accuracy is achieved. Can be secured.

As described above, the flatness measuring tool 20 maintains the height position of the sliding block 25 accurately and constant, and therefore, once the zero point adjustment is performed, it is often unnecessary to perform the zero point adjustment. Workability is good.
Further, the stabilization block 43 attached to the back surfaces of the jaws 23 and 24 of the caliper 21 can maintain the posture in which the jaws 23 and 24 of the caliper 21 are upright even when the hands are released from the caliper 21. Workability is good.
Further, since the position of the dial gauge 26 can be set by looking at the scale 22b of the caliper 21 from the window 34a of the holding cover 34 of the sliding block 25, it is easy to correctly place the dial gauge 26 at the measurement point. Measurement work is also easy in terms of points.

As described above, in the present invention, the height of the slide block 25 is determined with reference to the upper end surface of the scale portion 22, and thus the height of the dial gauge 26 when the slide block 25 is slid is set. Although it is possible to maintain a constant value with high accuracy, a leaf spring is arranged on the upper end surface side of the scale portion like a general caliper slider portion (see the leaf spring 30 of the slider 28 portion in FIG. 1). ) And compared with the case where the lower surface side of the scale part is used as the height reference of the sliding block.
FIG. 11 is a schematic diagram for explaining a measurement error that occurs when the leaf spring 38 ′ is not disposed on the lower surface side of the scale portion 22 as in the present invention, but is disposed on the upper surface side of the scale portion 22 ′. FIG. 4A shows a state where the sliding block 25 ′ to which the dial gauge is attached is not inclined in the caliper longitudinal direction, and FIG. 4B shows a state where the inclination is generated.
As shown in FIG. 11 (a), when the leaf spring 38 'is sufficiently strong even when the leaf spring 38' is disposed on the upper end surface of the scale portion 22 'and the lower surface side of the scale portion 22' is used as a reference, Since the moving block 25 ′ is kept horizontal, there is no particular problem. However, when the leaf spring 38 ′ becomes weak, the sliding block 25 ′ easily tilts as shown in FIG. When the inclination θ ₁ with respect to the scale portion is generated in the sliding block 25 ′, the sliding block 25 ′ is lowered by δ ₁ = L ₁ θ _{1/2 at} the center position (dial gauge position) of the sliding block 25 ′. The accuracy of the height position goes wrong.
However, as described above, in the present invention, the leaf spring 38 is disposed on the lower surface side of the scale portion 22, so even if the leaf spring is weakened, the sliding block 25 of the scale portion 22 is used as a reference only. Since the height position is determined, there is no variation in the height position of the sliding block 25 (variation in the height position of the dial gauge 26).
Thus, the flat spring measurement accuracy is improved by disposing the leaf spring 38 on the lower end surface of the scale portion 22 and using the lower surface side of the scale portion 22 as a reference.

Further, as described above, in the present invention, the leaf spring 39 is also arranged on the back side of the scale portion 22, so that it is possible to effectively prevent the occurrence of errors due to the inclination of the scale portion 22 of the sliding block 25 in the thickness direction. ing.
FIG. 12 illustrates the inclination in the thickness direction of the scale portion when the leaf spring is not disposed on the back surface of the scale portion 22 ″ unlike the present invention, and the measurement error due to the inclination. FIG. When no inclination in the thickness direction of the scale portion occurs at 25 ″, (b) indicates that the dial gauge (its center line is indicated by a) is offset by L ₂ from the cross-sectional center line of the scale portion. when the sliding block 25 'is the scale portion 22 "inclined by theta ₂ relative to the scale portion 22" indicating a state inclined by theta ₂ to the scale portion the thickness direction with respect to the weight, in the center line a of the dial gauge The height displacement δ ₂ is L ₂ × θ ₂ , and such an error of the height δ ₂ occurs.
However, in the present invention, since the leaf spring 39 is disposed on the back surface of the scale portion 22, as described above, the slide block 25 is kept horizontal without being inclined with respect to the scale portion 22. Measurement errors due to the inclination in the thickness direction of the scale portion are prevented as much as possible.

  The attachment structure of the leaf spring will be described. For example, a structure as shown in FIG. In this example, grooves 32c and 32d are formed on both sides of the caliper longitudinal direction in the rectangular concave groove 32 of the block body 33, while the leaf springs 38 and 39 have edge portions 38a fitted into the grooves 32c and 32d, The leaf springs 38 and 39 can be mounted in the rectangular groove 32 of the block main body 33 by bending 39a and fitting the edge portions 38a and 39a into the grooves 32c and 32d.

Further, as shown in FIG. 8, steps 32e and 32f are further formed on both sides in the longitudinal direction of the caliper in the rectangular groove 32, and both end edges of the leaf springs 38 and 39 are disposed so as to abut against the corners of the steps 32e and 32f. In addition, it is possible to attach the rectangular body 32 to the block body 33.
In this case, pins 45 and 46 are provided on the stepped portions 32e and 32f, and notches 38b and 39b with which the pins 45 and 46 are engaged are formed on the leaf springs 38 and 39, so that stable attachment can be achieved. May be.
Each of the leaf springs 38 and 39 in the illustrated example has a cross-sectional shape of two peaks and is in contact with the scale portion 22 at two locations, which is effective in ensuring parallelism with respect to the scale portion 22. A simple leaf-shaped curved leaf spring may be used like the leaf springs 38 and 39 shown in (a) and (b).
In the present invention, the first or second elastic body is not necessarily a curved leaf spring that is entirely curved as in the embodiment, but includes a straight portion and a shape that looks like a square shape, for example. A plate spring having a shape or a coil spring may be used as long as it exerts an elastic pressing action.

  In the first embodiment described above, as the structure of the sliding block 25, the rectangular concave groove 32 in which the scale portion 22 is accommodated is formed in the block main body 33, and the scale portion 22 is formed by the rectangular concave groove 32 and the pressing lid 34. Although the structure is sandwiched, a rectangular groove for accommodating the scale portion 22 is provided on the block body 33 side by forming a rectangular groove for accommodating the scale portion 22 on the holding lid side instead of the block body side. The same effect as in the case of (1) is obtained (the illustration of this embodiment is omitted).

In the first embodiment described above, as the structure of the sliding block 25, the rectangular concave groove 32 in which the scale portion 22 is accommodated is formed in the block main body 33, and the scale portion 22 is formed by the rectangular concave groove 32 and the pressing lid 34. Although the structure is sandwiched, a structure like the sliding blocks 25A and 25B shown in FIGS. That is, when the block main bodies 33A and 33B and the holding lids 34A and 34B are respectively combined with each other, rectangular holes 50A and 50B for accommodating the scale portion 22 are formed, and one is an L-shaped cross-sectional shape and the other is an inverted L-shape. It can also have a cross-sectional shape.
The sliding block 25A in FIG. 13A is a case where the block main body 33A has an L-shaped cross-sectional shape, and the holding lid 34A has an inverted L-shaped cross-sectional shape.
The sliding block 25B in FIG. 13B is a case where the block main body 33B has an inverted L-shaped cross-sectional shape, and the holding lid 34B has an L-shaped cross-sectional shape.
The above-described sliding blocks 25A and 25B can provide the same effects as those of the first embodiment having a structure in which the rectangular concave groove 32 in which the scale portion 22 is accommodated is provided in the block main body 33.

  The object to be measured by the flatness measuring tool of the present invention is not limited to the surface of a square steel pipe or a lightweight steel, but can be used for measuring the flatness of flat surfaces of various objects.

It is a front view of the flatness measuring tool of one Example of this invention. It is a top view of the said flatness measuring tool. It is an AA cross-sectional arrow view of the said flatness measuring tool. It is a principal part enlarged view of FIG. It is the BB cross-sectional arrow figure which expanded of FIG. It is CC sectional view taken on the line of FIG. It is a disassembled perspective view of the sliding block part in the said flatness measuring tool. It is a perspective view which shows the modification of the attachment structure of the leaf | plate spring in a sliding block. FIG. 7 shows another embodiment of the leaf spring structure, in which (A) is a perspective view of a leaf spring on the lower surface side, and (B) is a perspective view of a leaf spring on the back surface side. It is a figure explaining the condition which measures the flatness of a square steel pipe with said flatness measuring tool. In the flatness measuring instrument, it is a schematic diagram explaining what kind of measurement error occurs when the caliper longitudinal direction tilt occurs in the sliding block to which the dial gauge is attached, (A) is a state without tilt, (B) indicates a state in which an inclination occurs. In the flatness measuring tool, it is a schematic diagram explaining what kind of measurement error occurs when an inclination in the caliper thickness direction occurs in the sliding block to which the dial gauge is attached, (B) indicates a state in which an inclination occurs. (A) and (B) show different modified examples of the shape of the sliding block, and are schematic sectional views of the sliding block. It is a front view of the conventional flatness measuring tool. It is a perspective view of other conventional flatness measuring tools. It is principal part sectional drawing of the flatness measuring tool of FIG.

Explanation of symbols

20 Flatness measuring tool 21 Vernier caliper 22 Scale portion 22a Lower surface 22b Scale surface 22c Back surface 23, 24 Jaw 23a, 24a Rear surface 25, 25A, 25B (Jaw) Slide block 26 Dial gauge 27 Stem portion 28 Slider 29 Spindle 30 (slider) leaf spring 31 dial gauge mounting part 32 rectangular groove (part of rectangular hole)
32a The lower surface of the rectangular groove (the lower surface of the rectangular hole)
32b Back surface of rectangular groove (lower surface of rectangular hole)
32c, 32d Grooves 32e, 32f Step 33, 33A, 33B Block body 33a Split cylindrical hole 33b Split groove 33c Screw hole 34, 34A, 34B Holding lid 34a Window 34b (For dial gauge center position indication) Ruled line 35 Screw 36 Set screw 38 First elastic body (first curved leaf spring (curved leaf spring on the lower surface side of the scale portion))
39 Second elastic body (second curved leaf spring (curved leaf spring on the back side of the scale portion))
38a, 39a End edge 38b, 39b Notch 40 Set screw 41 Dial gauge fixing screw 43 Stabilization block 45, 46 Pin 50, 50A, 50B (formed by block body and holding lid) Rectangular hole

Claims (7)

A flatness measuring tool in which a sliding block is slidably mounted between the jaws of the scale part of the caliper, and the stem part of the dial gauge is fixed vertically to the sliding block,
The sliding block has a block main body having a dial gauge mounting portion to which a dial gauge stem portion is attached and a groove in which a scale portion having a thin rectangular cross section is slidably received, and presses the scale portion in the groove. And a first elastic body disposed between the lower surface of the rectangular hole formed by the block body and the pressing lid and the lower surface of the scale portion. A flatness measuring instrument.   The flatness measuring tool according to claim 1, wherein a second elastic body is disposed between the back surface of the rectangular hole formed by the block body and the pressing lid and the back surface of the scale portion.   The flatness measuring tool according to claim 1, wherein the first elastic body is a leaf spring.   The flatness measuring tool according to claim 2, wherein the second elastic body is a leaf spring.   The flatness measuring tool according to claim 1, wherein a stabilization block having a lower end surface aligned with a lower end of the jaw is attached to a back surface of the jaw of the caliper.   The flatness measuring tool according to claim 1, wherein a window that allows a vernier caliper to be seen is provided on a holding lid of the sliding block.   The flatness measuring tool according to claim 1, wherein the caliper is obtained by removing the inner measuring beak portion and the depth measuring depth bar in the Mosel type caliper.

Images