JP7353145B2 - Inner diameter measuring caliper and inner diameter measuring method - Google Patents

Description

This case relates to an inner diameter measuring caliper and an inner diameter measuring method.

Conventionally, calipers have been known that can measure the inner diameter (hole diameter) at a desired depth (depth position) of the hole to be measured by installing an inner measuring edge stopper on the inner measuring edge with a measuring scale. (For example, see Patent Document 1). The internal measuring edge stopper in the caliper of Patent Document 1 is inserted into one of a pair of internal measuring edges.

Utility Model Publication No. 57-166102

However, in the caliper disclosed in Patent Document 1, even when the internal measuring edge stopper is in contact with the end surface of the opening, the internal measuring edge may be inserted at an angle with respect to the hole to be measured. If the internal measuring edge is in a state of inclination with respect to the hole to be measured, the measurement error in measuring the internal diameter becomes large.

One aspect of the present invention is to provide an inner diameter measuring caliper and an inner diameter measuring method with less measurement error at a desired depth position.

In one aspect, the inner diameter measuring caliper includes a main scale, a movable member that is movable relative to the main scale along the axial direction of the main scale, and extends from the main scale and serves as an object for measuring the inner diameter. a first jaw having a first measuring surface that abuts one measured position on the inner circumferential wall surface of the hole; a second jaw having a second measurement surface that comes into contact with the other measured position on the peripheral wall surface; and a second jaw between the first measurement surface of the first jaw and the main scale. a first measuring surface that is movable relative to the main scale and protrudes outward from the first measurement surface on the opposite side to the second jaw along the axial direction of the main scale; A movable element is provided between the second measurement surface of the second jaw and the moving member so as to be movable with respect to the second jaw, and the first A positioning tool including a second mover protruding outward from the second measurement surface on the opposite side to the side where the jaws are located.

In the inner diameter measuring caliper, the first movable element and the second movable element can be coupled and separated from each other, and in the coupled state, the first movable element and the second movable element can be moved along the axial direction of the first jaw and the second jaw. It is possible to make it movable.

In one aspect, the inner diameter measuring caliper includes a main scale, a movable member that is movable relative to the main scale along the axial direction of the main scale, and a movable member that extends from the main scale and that is an object to be measured in the inner diameter. a first jaw having a first measurement surface that comes into contact with one of the measured positions on the inner circumferential wall surface of the hole; and a first jaw extending from the movable member and disposed opposite to the first jaw; a second jaw having a second measurement surface that comes into contact with the other measured position on the inner circumferential wall surface; The first jaw and the second jaw are provided movably along the axial direction, and the length along the axial direction of the main scale is such that the first jaw and the second jaw are brought closest to each other. one end along the axial direction of the main scale that is longer than the distance between the first measurement surface and the second measurement surface in the state, protrudes outward from the first measurement surface on the side opposite to the side where the jaws of the main scale are located, and the other end along the axial direction of the main scale extends along the axial direction of the main scale. A positioning tool is provided on a side opposite to the side where the jaws are located and protrudes outward from the second measurement surface.

In the inner diameter measuring caliper, the positioning tool is movable with respect to the first jaw or the second jaw, and is movable with respect to the first jaw or the second jaw in a plane including the measurement direction. a third mover that allows relative rocking; and a third mover that traverses the first jaw and the second jaw along the axial direction of the main scale and rotates about an axis that is parallel to the measurement direction. and an abutment member that can be provided.

Furthermore, in one aspect, the inner diameter measuring method includes: a first measuring surface provided on a first jaw extending from the main scale and abutting on one measured position of the inner circumferential wall surface of the hole to be measured; A second measurement provided on a second jaw extending from a movable member movable along the axial direction of the main scale with respect to the main scale and abutting the other measured position on the inner peripheral wall surface. positioning the positioning tool by moving the positioning tool along the axial direction of the first jaw and the second jaw such that the surface is located at the measured depth of the hole; The first jaw and the second jaw are inserted into the hole through the opening of the hole, and the first contact surface and the second contact surface of the positioning tool are spread around the opening of the hole. a step of bringing the moving member into contact with the depth reference plane at positions separated by the inner diameter of the hole; and a step of bringing the moving member into contact with the first contact surface and the second contact surface, respectively, in contact with the depth reference plane. is moved relative to the main scale to bring the first measuring surface into contact with one measured position on the inner circumferential wall surface of the hole, and the second measuring surface is brought into contact with the other measured position on the inner circumferential wall surface of the hole. It is characterized by including the step of bringing it into contact with a measurement position.

It is possible to provide an inner diameter measuring caliper and an inner diameter measuring method with less measurement error at a desired depth position.

1(A) is a front view, FIG. 1(B) is a left side view, and FIG. 1(C) is a bottom view. FIG. FIG. 2 is an explanatory diagram showing an enlarged view of the periphery of the tip portions of the first jaw and the second jaw of the inner diameter measuring caliper of the first embodiment. FIG. 3 is an explanatory diagram showing how the inner diameter of a hole to be measured is measured by the inner diameter measuring caliper of the first embodiment. FIG. 3 is an explanatory diagram showing how the inner diameter of a hole having a step on the inner circumferential wall is measured by the inner diameter measuring caliper of the first embodiment. FIG. 3 is an explanatory diagram showing how the inner diameter of a hole having a step on the inner circumferential wall is measured by the inner diameter measuring caliper of the first embodiment. FIG. 6 is an explanatory diagram showing the tips of the first and second jaws of the inner diameter measuring caliper of the second embodiment, with FIG. 6(A) being a front view and FIG. 6(B) being a bottom view. 7(A) is a front view, and FIG. 7(B) is an explanatory view showing the tips of the first and second jaws of the inner diameter measuring caliper of the third embodiment; FIG. -A cross-sectional view. It is an explanatory view showing an example of operation of a positioning tool which an inner diameter measuring caliper of a 3rd embodiment has. It is an explanatory view showing an example of operation of a positioning tool which an inner diameter measuring caliper of a 3rd embodiment has. FIG. 7 is an explanatory diagram showing how the inner diameter of a hole to be measured is measured by the inner diameter measuring caliper of the third embodiment. FIG. 3 is an explanatory diagram showing a measurement direction of a hole to be measured and an inclination direction of a depth reference plane. FIG. 7 is an explanatory diagram showing how the inner diameter of a hole whose depth reference plane is inclined is measured by the inner diameter measuring caliper of the third embodiment. FIG. 7 is an explanatory diagram showing how the inner diameter of a hole whose depth reference plane is inclined is measured by the inner diameter measuring caliper of the third embodiment. FIG. 9 is an explanatory diagram showing how the inner diameter of a hole whose central axis is inclined with respect to the vertical direction is measured by the inner diameter measuring caliper of the third embodiment.

(First embodiment)
First, with reference to FIGS. 1 to 3, the configuration of an inner diameter measuring caliper (hereinafter simply referred to as "caliper") 1 according to the first embodiment will be described. FIG. 1 is a three-sided view showing the main parts of a caliper 1 according to the first embodiment, in which FIG. 1(A) is a front view, FIG. 1(B) is a left side view, and FIG. 1(C) is a bottom view. be. FIG. 2 is an explanatory diagram showing an enlarged view of the vicinity of the tip portions of the first jaw 4 and the second jaw 5 of the caliper 1 of the first embodiment. FIG. 3 is an explanatory diagram showing how the inner diameter of the hole 15 to be measured is measured by the caliper 1 of the first embodiment. In FIG. 1(A), the right side portion of the caliper 1 is omitted. In FIG. 1(B), the upper part of the caliper 1 is omitted. In FIG. 1(C), the right side portion of the caliper 1 is omitted.

Referring to FIGS. 1A to 2, the caliper 1 includes a main scale 2, a slider 3 as a moving member, a first jaw 4, a second jaw 5, and a positioning tool 6. The main scale 2 has an axis AX2 extending along its longitudinal direction, and has a scale for measuring the inner diameter on its surface.

The slider 3 is provided so as to be movable along the axis AX2 direction of the main scale 2. The slider 3 includes a detection head on the main scale 2 that detects the amount of displacement of the slider 3 with respect to the main scale 2 in cooperation with an electromagnetic induction scale provided along the axis AX2 direction. Further, the slider 3 includes a display section 3a that displays the measurement value read by the detection head.

A first jaw 4 extends from the main length 2. More specifically, the first jaw 4 extends from the end of the main scale 2 in a direction perpendicular to the axis AX2 of the main scale 2. A first measurement surface 4a is provided at the end of the first jaw 4 on the side away from the main scale 2. The first measurement surface 4a in this embodiment is a hemispherical surface that is convex on the side opposite to the side where the second jaw 5 is located, but the shape of the first measurement surface 4a is The surface is not limited to this, and may be a smooth surface perpendicular to the measurement direction, for example. The first measurement surface 4a has a central axis AX15 and comes into contact with one measured position 15a on the inner circumferential wall surface of the hole 15 whose inner diameter is to be measured (see FIG. 3(B)). A scale 4b indicating the depth of the first measurement surface 4a is attached to the surface of the first jaw 4 of this embodiment. Note that the axis AX4 of the first jaw 4 is perpendicular to the axis AX2 of the main scale 2.

A second jaw 5 extends from the slider 3. The second jaw 5 is arranged to face the first jaw 4, and a second measurement surface 5a is provided at the end remote from the slider 3. The second measurement surface 5a in this embodiment is a hemispherical surface that is convex on the side opposite to the side where the first jaw 4 is located, but the shape of the second measurement surface 5a is The surface is not limited to this, and may be a smooth surface perpendicular to the measurement direction, for example. The second measurement surface 5a comes into contact with the other measured position 15b on the inner circumferential wall surface of the hole 15 (see FIG. 3(B)). In this embodiment, since the first jaw 4 is provided with a scale 4b that indicates the depth of the first measurement surface 4a, the second jaw 5 is not provided with a scale; 5 may be provided with a scale indicating the depth of the second measurement surface 5a. Note that the axis AX5 of the second jaw 5 is orthogonal to the axis AX2 of the main scale 2. Further, the axis AX4 of the first jaw 4 and the axis AX5 of the second jaw 5 are parallel.

The positioning tool 6 is provided so as to be movable along the axis AX4 of the first jaw 4 and the axis AX5 of the second jaw 5. The positioning tool 6 defines the depth positions of the first measurement surface 4a and the second measurement surface 5a within the hole 15. The positioning tool 6 has a first contact surface 7a and a second contact surface 8a that contact a depth reference surface 16 (see FIGS. 3(A) and 3(B)) extending around the opening of the hole 15. We are prepared. By installing the positioning tool 6 so that both the first contact surface 7a and the second contact surface 8a are in contact with the depth reference surface 16, the first jaw 4 and the second jaw 5 are aligned in the hole. It is inserted without tilting with respect to 15. That is, the center positions of the first jaw 4 and the second jaw 5 are aligned with the central axis AX15 of the hole 15, and both the first measurement surface 4a and the second measurement surface 5a are at the desired depth. be able to locate. In other words, by installing the positioning tool 6 with a plurality of contact surfaces in contact with the depth reference surface 16, the axis AX4 of the first jaw 4 and the axis AX5 of the second jaw 5 are aligned within the hole 15. Becomes parallel to the surrounding wall surface. Thereby, the measurement error in measuring the inner diameter of the hole 15 can be reduced.

The positioning tool 6 includes a first mover 7 and a second mover 8. The first mover 7 is provided between the first measuring surface 4a of the first jaw 4 and the main scale 2 so as to be movable with respect to the first jaw 4. Further, the first mover 7 protrudes outward from the first measurement surface 4a on the side opposite to the side where the second jaw 5 is located along the axis AX2 direction of the main scale 2. The first mover 7 is provided in sliding contact with the surface of the first jaw 4, and has a clamp screw 9a so that it can be fixed to the first jaw 4 at a desired position of the first jaw 4. installed. The second mover 8 is provided between the second measurement surface 5a of the second jaw 5 and the slider 3 so as to be movable with respect to the second jaw 5. Further, the second mover 8 protrudes outward from the second measurement surface 5a on the side opposite to the side where the first jaw 4 is located along the axis AX2 direction of the main scale 2. The second mover 8 is provided in sliding contact with the surface of the second jaw 5, and has a clamp screw 9b attached thereto so that it can be fixed to the second jaw 5 at a desired position of the second jaw 5. It is being

The first mover 7 and the second mover 8 can be coupled to each other and can be separated. The first mover 7 includes a fitting recess 7b on the side facing the second mover 8. The second mover 8 includes a fitting convex portion 8b that can fit into the fitting recess 7b. The first mover 7 and the second mover 8 are integrated by fitting the fitting recess 7b and the fitting protrusion 8b. The first mover 7 and the second mover 8 can move relative to the first jaw 4 and the second jaw 5 in an integrated state.

The positioning tool 6 includes a first contact surface 7a and a second contact surface 8a that contact the depth reference surface 16. Here, the first contact surface 7a is located on the side of the first slider 7 opposite to the side where the second jaw 5 is located along the axis AX2 direction of the main scale 2. It is provided in a part that protrudes outward. Further, the second contact surface 8a is located on the opposite side of the second slider 8 from the side where the first jaw 4 is located along the axis AX2 direction of the main scale 2, from the second measurement surface 5a. It is also provided on the part that protrudes outward. In this way, the first contact surface 7a and the second contact surface 8a are provided at positions separated by the inner diameter to be measured along the measurement direction, so that the positioning tool 6 can be adjusted to the depth in a more stable state. It can be installed on the reference surface 16, and as a result, the first jaw 4 and the second jaw 5 can be inserted into the hole 15 without being inclined. Thereby, the measurement error in measuring the inner diameter of the hole 15 can be reduced.

In this embodiment, the first contact surface 7a is provided on the first mover 7, and the second contact surface 8a is provided on the second mover 8. As a result, the first contact surface 7a protrudes further outward than the first measurement surface 4a, and the second contact surface 8a protrudes further outward than the second measurement surface 5a. The first contact surface 7a and the second contact surface 8a are in contact with the depth reference surface 16, respectively, even when the first mover 7 and the second mover 8 are separated. can continue to do so. Thereby, both the first measurement surface 4a and the second measurement surface 5a can be located at desired depths.

In this embodiment, the first mover 7 is provided with the fitting recess 7b, and the second mover 8 is provided with the fitting protrusion 8b, but the fitting recess and the fitting protrusion are provided interchangeably. You can also do this. Further, the mode for enabling the first mover 7 and the second mover 8 to be coupled and separated is not limited to the combination of the fitting recess and the fitting convex, but may be other modes. For example, it may be a combination of a pin and an insertion hole for the pin.

Next, measurement of the inner diameter of the hole 15 using the caliper 1 of this embodiment will be described with reference to FIGS. 3(A) and 3(B). First, as shown in FIG. 3(A), the fitting concave portion 7b and the fitting convex portion 8b are fitted, and the first mover 7 and the second mover 8 are combined to integrate them. I'll keep it. Then, the positioning tool 6 in which the first mover 7 and the second mover 8 are integrated is moved along the axis AX4 of the first jaw 4 and the axis AX5 of the second jaw 5, and the first adjustment so that the measurement surface 4a and the second measurement surface 5a are located at the measurement depth. The adjusted first mover 7 and second mover 8 are fixed to the first jaw 4 and the second jaw 5, respectively, by clamp screws 9a and 9b. At this time, since the first mover 7 and the second mover 8 are integrated, the first contact surface 7a provided on the first mover 7 and the contact surface 7a provided on the second mover 8 are The height of the second contact surface 8a is adjusted to be the same as that of the second contact surface 8a.

After the depth positions of the first measurement surface 4a and the second measurement surface 5a are adjusted, as shown in FIG. 3(B), the first measurement surface 4a and the second measurement surface 5a are 15 into the hole 15. Then, the first contact surface 7a and the second contact surface 8a are brought into contact with the depth reference surface 16 that extends around the opening of the hole 15, respectively. Thereby, the first measurement surface 4a and the second measurement surface 5a can reach a desired measurement depth.

Here, when the first measuring surface 4a and the second measuring surface 5a are inserted into the hole 15 while the first moving element 7 and the second moving element 8 are integrated, the diameter of the opening of the hole 15 is In some cases, it may be impossible to bring both the first contact surface 7a and the second contact surface 8a into contact with the depth reference surface 16. In such a case, increase the distance between the first jaw 4 and the second jaw 5 so that both the first contact surface 7a and the second contact surface 8a can contact the depth reference surface 16. .

From this state, when the slider 3 is operated to move relative to the main scale 2 and the distance between the first jaw 4 and the second jaw 5 is widened, the first measurement surface 4a is moved to the one measured position 15a. The second measurement surface 5a contacts the other measured position 15b. The positions to be measured 15a and 15b face each other on the inner circumferential wall surface of the hole 15, and are located across the inner diameter to be measured. The first measuring surface 4a abuts one of the measured positions 15a and the second measuring surface 5a abuts the other measured position 15b, thereby reducing the measurement error in measuring the inner diameter at the desired depth of the hole 15. It can be reduced.

If the measured value is read with the first measuring surface 4a in contact with one measured position 15a and the second measuring surface 5a in contact with the other measured position 15b, the desired depth of the hole 15 can be determined. The inner diameter can be measured.

In the above example, the distance between the first jaw 4 and the second jaw 5 was widened after the first measurement surface 4a and the second measurement surface 5a reached the desired depth. method may be adopted. For example, after fixing the positioning tool 6, the distance between the first jaw 4 and the second jaw 5 is roughly increased in advance, and then the first measurement surface 4a and the second measurement surface 4a, which are hemispherical surfaces, are The two measurement surfaces 5a may be moved to follow the inner circumferential wall surface of the hole 15, respectively. Finally, the first measurement surface 4a may be pressed against one of the positions to be measured 15a, and the second measurement surface 5a may be pressed against the other position to be measured 15b.

The caliper 1 of this embodiment can be used even when a step is formed on the inner peripheral wall surface of the hole to be measured. The hole 15 shown in FIGS. 3(A) and 3(B) has approximately the same inner diameter throughout the entire depth direction. On the other hand, the hole 25 having the center axis AX25 shown in FIGS. 4(A) and 4(B) has a small diameter portion 25a near the opening and a large diameter portion 25b at a deeper position. There is. The caliper 1 of this embodiment can also measure the inner diameter of the large diameter portion 25b of the hole 25 having such an inner peripheral shape. Also when measuring the inner diameter of the large diameter portion 25b, the first contact surface 7a and the second contact surface 8a are kept in contact with the depth reference surface 26, respectively.

Here, in order for the first measurement surface 4a and the second measurement surface 5a to reach the large diameter section 25b, it is necessary to prevent the first measurement surface 4a and the second measurement surface 5a from colliding with the small diameter section 25a. It is required to narrow the distance between the first jaw 4 and the second jaw 5. Therefore, even when the distance between the first jaw 4 and the second jaw 5 is narrowed, the first contact surface 7a and the second contact surface 8a can both contact the depth reference surface 26. The areas of the contact surface 7a and the second contact surface 8a are set.

Thereby, as shown in FIG. 4(A), the first contact surface 7a and the second contact surface 8a can each be brought into contact with the depth reference surface 26. Thereafter, if the distance between the first jaw 4 and the second jaw 5 is widened as shown in FIG. 4(B), the inner diameter of the large diameter portion 25b can be measured.

The hole 25 shown in FIGS. 4(A) and 4(B) had a large diameter portion 25b located deeper than the small diameter portion 25a near the opening. On the other hand, the hole 35 having the center axis AX35 shown in FIGS. 5(A) and 5(B) has a large diameter portion 35a near the opening and a small diameter portion 35b at a deeper position. There is. The caliper 1 of this embodiment can also measure the inner diameter of the small diameter portion 35b of the hole 35 having such an inner peripheral shape. Also when measuring the inner diameter of the small diameter portion 35b, the first contact surface 7a and the second contact surface 8a are each brought into contact with the depth reference surface 36.

Here, in order to bring the first measurement surface 4a and the second measurement surface 5a into contact with the small diameter section 35b, the distance between the first measurement surface 4a and the second measurement surface 5a must be adjusted to at least the distance between the first measurement surface 4a and the second measurement surface 5a of the small diameter section 35b. Must be smaller than the inner diameter. Therefore, it is required to narrow the distance between the first jaw 4 and the second jaw 5. The areas of the first contact surface 7a and the second contact surface 8a are set so that they can both contact the depth reference surface 36 when the distance between the first jaw 4 and the second jaw 5 is narrowed. ing.

Thereby, as shown in FIG. 5(A), the first contact surface 7a and the second contact surface 8a can each be brought into contact with the depth reference surface 36. Thereafter, by bringing the first jaw 4 and the second jaw 5 into contact with the small diameter portion 35b as shown in FIG. 5(B), the inner diameter of the small diameter portion 35b can be measured.

(Second embodiment)
Next, a second embodiment will be described with reference to FIG. 6. The second embodiment includes a positioning tool 106 instead of the positioning tool 6 of the first embodiment. Other points are the same as in the first embodiment, so common components are given the same reference numerals in the drawings, and detailed explanation thereof will be omitted.

The positioning tool 106 is provided between the first measuring surface 4a and the second measuring surface 5a and the main scale 2 so as to be movable along the axes AX4 and AX5 of the first jaw 4 and the second jaw 5. It is being Further, the positioning tool 106 crosses the first jaw 4 and the second jaw 5 along the axis AX2 direction (measurement direction) of the main scale 2. The length of the positioning tool 106 along the axis AX2 direction of the main scale 2 is the length of the first measurement surface 4a and the second measurement surface 5a when the first jaw 4 and the second jaw 5 are brought closest to each other. longer than the distance between. Then, one end of the main scale 2 along the axis AX2 direction is located on the side opposite to the side where the second jaw 5 is located along the axis AX2 direction of the main scale 2, relative to the first measurement surface 4a. protrudes outward. A first contact surface 106a1 that contacts the depth reference surface 16 extending around the opening of the hole 15 is provided at this protruding portion. Further, the other end of the main scale 2 along the axis AX2 direction is located on the side opposite to the side where the first jaw 4 is located along the axis AX2 direction of the main scale 2, and is located on the side opposite to the second measurement surface 5a. protrudes outward. Second contact surfaces 106b1 and 106c1 that contact the depth reference surface 16 are provided at this protruding portion.

More specifically, the positioning tool 106 has a block-shaped body part 106a at one end, a first arm part 106b and a second arm part 106b extending from the body part 106a along the axis AX2 direction (measurement direction) of the main scale 2. The arm portion 106c is provided. The body portion 106a is disposed on the side of the first jaw 4 in the measurement direction, and the first arm portion 106b and the second arm portion 106c are disposed in parallel. The positioning tool 106 is provided so that the first jaw 4 and the second jaw 5 are arranged in a region surrounded by the body 106a, the first arm 106b, and the second arm 106c. A clamp screw 109 is provided on the body portion 106a, and the positioning tool 106 can be fixed to the first jaw 4. Note that although the positioning tool 106 of this embodiment is provided so that the body portion 106a is located on the first jaw 4 side, it may also be provided such that the body portion 106a is located on the second jaw 5 side. good.

The body portion 106a is provided with a first contact surface 106a1, the first arm portion 106b is provided with a second contact surface 106b1, and the second arm portion 106c is provided with a second contact surface 106c1. is provided. The first contact surface 106a1 and the second contact surfaces 106b1 and 106c1 respectively correspond to the first contact surface 7a and the second contact surface 8a in the first embodiment. Therefore, the second embodiment can be used in the same way as the first embodiment.

That is, the first contact surface 106a1, the second contact surfaces 106b1, 106c1 are brought into contact with the depth reference surface 16, and the first measurement surface 4a and the second measurement surface 5a are arranged at a desired depth to measure the inner diameter. Measurements can be taken. In this embodiment, the first arm portion 106b includes the second contact surface 106b1 and the second arm portion 106c includes the second contact surface 106c1, but the embodiment includes only one of the arm portions. You can also use it as

Note that since the positioning tool 106 in this embodiment does not restrict the movement of the second jaw 5, the distance between the first jaw 4 and the second jaw 5 can be adjusted in the same manner as in the first embodiment. It can be carried out.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. 7(A) to 14. The third embodiment includes a first jaw 114 instead of the first jaw 4 of the first embodiment. A second jaw 115 is provided in place of the second jaw 5. Furthermore, a positioning tool 116 is provided instead of the positioning tool 6.

The first jaw 114 has a first measuring surface 114a at its end. Although the first measurement surface 114a in this embodiment is a smooth surface perpendicular to the measurement direction, it may be a hemispherical surface as in the first embodiment. The second jaw 115 has a second measurement surface 115a at its end. The second measurement surface 115a is also a smooth surface, but may be a hemispherical surface. The first jaw 114 is provided with a guide groove 114b against which the tip of a clamp screw 120 (described in detail later) comes into contact. The guide groove 114b extends along the axis AX114 of the first jaw 114. Further, a first reference line 114c is drawn on the first jaw 114 along the axis AX114. A scale 115b indicating the depth of the second measurement surface 115a is attached to the surface of the second jaw 115. The scale 115b has a center point in the depth direction of the second measurement surface 115a as a depth of 0.

The positioning tool 116 is provided between the first measuring surface 114a and the second measuring surface 115a and the main scale 2 so as to be movable along the axes AX114 and AX115 of the first jaw 114 and the second jaw 115. It is being The positioning tool 116 includes a third mover 117 that is movably provided with respect to the first jaw 114, and an abutment member 119 that is connected to the third mover 117 via a rotating shaft member 118. It is equipped with

The third slider 117 is fixed to the first jaw 114 by a clamp screw 120. Moreover, by loosening the clamp screw 120, relative rocking of the first jaw 114 and the second jaw 115 with respect to the third movable element 117 is allowed. Referring to FIG. 7A, the surface of the third slider 117 has a first angle scale indicating the relative rotation angle between the axis AX114 around the axis AX120 of the clamp screw 120 and the third slider 117. 117a is depicted. By aligning the first reference line 114c drawn on the first jaw 114 with a desired angular position on the first angle scale 117a, the angular positional relationship between the positioning tool 116 and the first jaw 114 can be set. . This is effective when the depth reference plane extending around the opening of the hole to be measured is inclined, especially in a case where the direction of inclination and the measurement direction match.

Referring to FIG. 8(A) and FIG. 8(B), the third moving element 117 has a second angle scale 117b drawn on a surface different from the surface on which the first angle scale 117a is drawn. There is. The second angle scale 117b indicates the angular positional relationship between the third movable element 117 and the abutting member 119, which are relatively rotatable around the axis AX118 of the rotating shaft member 118.

The contact member 119 crosses the first jaw 114 and the second jaw 115 along the axis AX2 direction (measurement direction) of the main scale 2. The length of the contact member 119 along the axis AX2 direction of the main scale 2 is the length of the first measurement surface 114a and the second measurement surface 115a when the first jaw 114 and the second jaw 115 are brought closest to each other. longer than the distance between. Then, one end of the main scale 2 along the axis AX2 direction is located on the side opposite to the side where the second jaw 115 is located along the axis AX2 direction of the main scale 2, relative to the first measurement surface 114a. protrudes outward. A first contact surface 119a1 that contacts a depth reference surface extending around the opening of the hole is provided on this protruding portion. Further, the other end of the main scale 2 along the axis AX2 direction is located on the opposite side of the second measuring surface 115a from the side where the first jaw 114 is located along the axis AX2 direction of the main scale 2. protrudes outward. Second contact surfaces 119b1 and 119c1 that contact the depth reference surface are provided on this protruding portion.

More specifically, the contact member 119 has a block-shaped body 119a at one end, and a first arm 119b and a second arm extending from the body 119a along the axis AX2 of the main scale 2. 119c. The body portion 119a is disposed on the side of the first jaw 114 in the measurement direction, and the first arm portion 119b and the second arm portion 119c are disposed in parallel. The contact member 119 is provided so that the first jaw 114 and the second jaw 115 are arranged in a region surrounded by the body 119a, the first arm 119b, and the second arm 119c. . The body portion 119a is connected to the third mover 117 via the rotating shaft member 118, and is rotatable around the axis AX118 of the rotating shaft member 118. The axis AX118 is set to be parallel to the axis AX2 direction (measurement direction) of the main scale 2. A second reference line 119a2 is drawn on the body portion 119a in parallel with the first contact surface 119a1. The angular positional relationship between the third movable element 117 and the contact member 119 can be set by the second angle scale 117b indicated by the second reference line 119a2.

This allows the positioning tool 116 to rotate in two directions. Therefore, even if the surface where the hole to be measured is opened and the central axis of the hole are not perpendicular to each other, such as when the depth reference plane is inclined, the measurement error can be minimized at the desired depth. Internal diameter measurements can be made.

Here, with reference to FIGS. 8(A) to 9, operations that can be performed by the positioning tool 116 will be described. 8(A) and 8(B) show the first jaw 114 viewed from the second jaw 115 side. Referring to FIG. 8(A), the first contact surface 119a1 and the second contact surfaces 119b1 and 119c1 are in a state perpendicular to the axis AX115 of the second jaw 115 (the axis AX114 of the first jaw 114). ing. On the other hand, referring to FIG. 8(B), the first contact surface 119a1 and the second contact surfaces 119b1 and 119c1 are connected to the axis AX115 of the second jaw 115 (the axis AX114 of the first jaw 114) in a side view. ). This is because the contact member 119 rotated around the axis AX118.

Next, referring to FIG. 9, the first jaw 114 and the second jaw 115 can rotate about the axis AX120 of the clamp screw 120 as a rotation axis. As a result, the first jaw 114 and the second jaw 115 can swing relative to the third mover 117. As a result, the first contact surface 119a1 and the second contact surfaces 119b1 and 119c1 are in a state where they obliquely intersect with the axis AX115 of the second jaw 115 (the axis AX114 of the first jaw 114) when viewed from the front. has been done.

In this way, the positioning tool 116 is rotatable in two directions, and its posture can be changed in various ways.

Next, with reference to FIG. 10, inner diameter measurement according to the third embodiment will be described. In the hole 45 to be measured, which has a central axis AX45, the depth reference plane 46 and the inner circumferential wall surface are perpendicular to each other in the cross section. When measuring the inner diameter of the hole 45 like this, the axis AX114 of the first jaw 114 and the axis AX115 of the second jaw 115 are aligned with the first contact surface 119a1 and the second The contact surfaces 119b1 and 119c1 are perpendicular to each other. Thereby, the first contact surface 119a1 and the second contact surfaces 119b1 and 119c1 come into contact with the depth reference surface 46, and the first measurement surface 114a and the second measurement surface 115a are positioned at the desired depth. I can do it.

Next, with reference to FIGS. 11(A) to 13, when the depth reference plane 56 is inclined, that is, the hole 55 is open with respect to the central axis AX55 of the hole 55 to be measured. A case where the surfaces intersect diagonally will be explained. First, the combination of the inclination direction of the depth reference plane 56 and the measurement direction will be described with reference to FIGS. 11(A) to 11(C). 11(A) to 11(C), an arrow 47 indicates the direction of inclination of the depth reference plane 56, the proximal side of the arrow 47 indicates the upstream side, and the distal side of the arrow 47 indicates the downstream side. Showing the side. FIG. 11(A) shows a mode in which the inclination direction of the depth reference surface 56 and the measurement direction are perpendicular to each other, and FIG. 11(B) shows a mode in which the inclination direction of the depth reference surface 56 and the measurement direction coincide. . FIG. 11C shows a mode in which the measurement direction is oblique to the inclination direction of the depth reference plane 56.

FIG. 12 shows how the inner diameter of the hole 55 shown in FIG. 11(A) is being measured. In this case, as shown in FIG. 8(B), the inner diameter is measured by rotating the contact member 119 about the axis AX118. In this case, if the second reference line 119a2 drawn on the body 119a of the contact member 119 is aligned with the second angle scale 117b in accordance with the inclination angle of the depth reference plane 56, measurement can be carried out smoothly. I can do it. Further, if the inclination angle of the depth reference surface 56 is not known, the inner diameter may be measured by installing the abutment member 119 in close contact with the depth reference surface 56. Although it is assumed that rotating the abutting member 119 will slightly deviate from the depth scale 115b (see FIG. 7(A)), the abutting member 119 can be brought into close contact with the depth reference surface 56 and the state By measuring the inner diameter, the measured depth position can be calculated from the inclination angle and the inner diameter value.

FIG. 13 shows how the inner diameter of the hole 55 shown in FIG. 11(B) is being measured. In this case, as shown in FIG. 9, the inner diameter is measured by tilting the first jaw 114 and the second jaw 115 with respect to the third mover 117. In this case, if the first reference line 114c drawn on the first jaw 114 is aligned with the first angle scale 117a in correspondence with the inclination angle of the depth reference surface 56, measurement can be carried out smoothly. Further, if the inclination angle of the depth reference surface 56 is not known, the inner diameter may be measured by installing the abutment member 119 in close contact with the depth reference surface 56. Although it is assumed that rotating the abutting member 119 will slightly deviate from the depth scale 115b (see FIG. 7(A)), the abutting member 119 can be brought into close contact with the depth reference surface 56 and the state By measuring the inner diameter, the measured depth position can be calculated from the inclination angle and the inner diameter value.

Note that the inner diameter measurement of the hole 55 in the mode shown in FIG. 11(C) can be achieved by combining the movements of the abutment member 119 in the modes shown in FIGS. 11(A) and 11(B).

FIG. 14 shows a state in which the surface in which the hole 65 is opened is, for example, horizontal, and the central axis AX65 of the hole 65 is inclined with respect to the vertical direction. That is, FIG. 14 shows a state in which the central axis AX65 of the hole 65 obliquely intersects the surface in which the hole 65 is open. This state corresponds to the state shown in FIG. 13 when paying attention to the relationship between the direction in which the central axis AX65 of the hole 65 extends and the depth reference plane 66. Therefore, the inner diameter can be measured even in the state shown in FIG. 14.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to these specific embodiments, and various modifications and variations can be made within the scope of the gist of the present invention as described in the claims. Changes are possible.

1 Inner diameter measuring caliper 2 Main scale 3 Slider (moving member)
4, 114 First jaw 4a, 114a First measurement surface 5, 115 Second jaw 5a, 115a Second measurement surface 6, 106, 116 Positioner 7 First mover 7a, 106a1, 119a1 1st Contact surface 8 Second mover 8a, 106b1, 106c1, 109b1, 109c1 Second contact surface 117 Third mover 118 Rotating shaft member 119 Contact member

Claims (5)

The main scale and
a moving member that is movable relative to the main scale along the axial direction of the main scale;
a first jaw extending from the main scale and having a first measuring surface that comes into contact with one measured position on the inner circumferential wall surface of the hole whose inner diameter is to be measured;
a second jaw extending from the movable member, disposed opposite to the first jaw, and including a second measurement surface that abuts the other measured position on the inner circumferential wall surface;
The second jaw is provided between the first measurement surface of the first jaw and the main scale so as to be movable with respect to the first jaw, and the second jaw is positioned along the axial direction of the main scale. a first movable element protruding outward from the first measuring surface, and a first movable element projecting outward from the first measuring surface, and a second movable element between the second measuring surface of the second jaw and the moving member. provided movably relative to the second jaw, and protruding outward from the second measurement surface on a side opposite to the side where the first jaw is located along the axial direction of the main scale; a positioning tool including a second mover;
Equipped with
The first movable element and the second movable element are capable of being coupled and separated from each other, and are movable along the axial direction of the first jaw and the second jaw in a coupled state. An inner diameter measuring caliper featuring: The main scale and
a moving member that is movable relative to the main scale along the axial direction of the main scale;
a first jaw extending from the main scale and having a first measuring surface that comes into contact with one measured position on the inner circumferential wall surface of the hole whose inner diameter is to be measured;
a second jaw extending from the movable member, disposed opposite to the first jaw, and including a second measurement surface that abuts the other measured position on the inner circumferential wall surface;
provided between the first measurement surface and the second measurement surface and the main scale so as to be movable along the axial direction of the first jaw and the second jaw; the length along the main scale is longer than the distance between the first measurement surface and the second measurement surface when the first jaw and the second jaw are brought closest to each other; one end along the axial direction of the main scale projects outward from the first measurement surface on a side opposite to the side where the second jaw is located along the axial direction of the main scale; The other end along the axial direction of the main scale protrudes outward from the second measurement surface on a side opposite to the side where the first jaw is located along the axial direction of the main scale. and,
An inner diameter measuring caliper characterized by being equipped with. The positioning tool is movable relative to the first jaw or the second jaw, and controls relative rocking of the first jaw and the second jaw in a plane including the measurement direction. a third mover that allows;
an abutment member that traverses the first jaw and the second jaw along the axial direction of the main scale and is rotatable about an axis that is parallel to the measurement direction;
The inner diameter measuring caliper according to claim 2 , further comprising: A first measuring surface provided on a first jaw extending from the main scale and abutting one measured position on the inner circumferential wall surface of the hole whose inner diameter is to be measured; a second measurement surface provided on a second jaw extending from a movable member provided movably along the inner circumferential wall surface and abutting the other measured position on the inner circumferential wall surface is located at the measurement depth of the hole. a step of positioning the positioning tool by moving the positioning tool along the axial direction of the first jaw and the second jaw;
The first jaw and the second jaw are inserted into the hole through the opening of the hole, and the first contact surface and the second contact surface of the positioning tool are connected to the periphery of the opening of the hole. a step of contacting positions separated by the inner diameter of the hole in a depth reference plane that spreads over the area;
With the first contact surface and the second contact surface in contact with the depth reference surface, the movable member is moved relative to the main scale to bring the first measurement surface into the hole. bringing the second measurement surface into contact with one of the measured positions on the peripheral wall surface, and bringing the second measurement surface into contact with the other measured position on the inner peripheral wall surface;
including ,
The positioning tool is provided between the first measurement surface and the second measurement surface and the main scale so as to be movable along the axial direction of the first jaw and the second jaw, and The length along the axial direction of the main scale is longer than the distance between the first measurement surface and the second measurement surface when the first jaw and the second jaw are brought closest to each other. long, and one end along the axial direction of the main scale is located outside the first measuring surface on the opposite side to the side where the second jaw is located along the axial direction of the main scale. the other end extending along the axial direction of the main scale is located outside the second measurement surface on a side opposite to the side where the first jaw is located along the axial direction of the main scale. A method for measuring the inner diameter characterized by protrusion . The positioning tool is movable relative to the first jaw or the second jaw, and controls relative rocking of the first jaw and the second jaw in a plane including the measurement direction. a third mover that allows;
further comprising: an abutment member that extends across the first jaw and the second jaw along the axial direction of the main scale and is rotatable about an axis that is parallel to the measurement direction;
In the step of positioning the positioning tool, the angular position of the third mover and the abutting member is set according to the inclination of a depth reference plane that spreads around the opening of the hole. The inner diameter measuring method according to claim 4 .

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