WO2016067350A1

WO2016067350A1 - Measurement gauge with scale for threaded hole effective diameter

Info

Publication number: WO2016067350A1
Application number: PCT/JP2014/078535
Authority: WO
Inventors: 卓也相川
Original assignee: オーエスジー株式会社
Priority date: 2014-10-27
Filing date: 2014-10-27
Publication date: 2016-05-06

Abstract

[Problem] To provide a measurement gauge that has a scale for a threaded hole effective diameter and is capable of efficiently measuring the effective diameter of a threaded hole. [Solution] An indicator part 30 is provided with a columnar part 31 and an outside fitting part 32 that is slidably fitted onto the columnar part 31. When a male screw part 20 is screwed, from one end side thereof, into a threaded hole to be measured, the outside fitting part 32 slides on the columnar part 31 along the direction of the axial center O of the columnar part. Screwing in the male screw part 20 until further screwing in is not possible results in the visible display on the indicator part 30 of the measurement result for the effective diameter of the threaded hole. The measurement result indicated on the indicator part 30 can be viewed after the male screw part 20 has been removed from the threaded hole. Therefore, the effective diameter of the threaded hole can be efficiently measured.

Description

Measuring gauge with female thread effective diameter scale

The present invention relates to a measurement gauge with a female thread effective diameter scale, and particularly relates to a measurement gauge with a female thread effective diameter scale that can efficiently measure the effective diameter of a female thread.

As an apparatus for measuring the effective diameter of a female screw, Patent Document 1 includes a tapered male screw (male thread portion) whose effective diameter gradually increases from one end side to the other end side. Gauges are disclosed. In Patent Document 1, a taper male screw is screwed into one of the female threads to be measured from one end side, and the effective diameter of the female thread is determined based on the axial position of the taper male screw that cannot be further screwed in. To grasp.

Japanese Patent Laying-Open No. 2005-227222 (paragraph 0006, FIG. 1, etc.)

However, in the conventional technology described above, the axial position of the taper male screw is scaled in a state where the taper male screw (male thread portion) is still screwed into the female screw in order to measure the axial position of the taper male screw. It was necessary to measure by. Therefore, for example, when measuring the effective diameter of a screw because it is formed in a narrow space such as the inside of a processing machine, while looking into the taper male screw screwed into the female screw, the shaft of the taper male screw The direction position must be measured, and there is a problem that the measuring operation of the effective diameter of the female screw is inefficient.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a measuring gauge with a female thread effective diameter scale that can efficiently measure the effective diameter of a female thread.

Means for Solving the Problems and Effects of the Invention

In order to achieve this object, according to the measuring gauge with a female thread effective diameter scale according to claim 1, when the male thread portion is screwed into the female thread until further screwing is impossible, The measurement result of the effective diameter is shown on the indicator portion disposed on the other end side of the male screw portion. Since the index part is graduated, it is possible to eliminate the need for operations such as measuring the axial position of the male thread part when confirming the amount of screwing into the female thread part of the female thread. There is.

Furthermore, since the measurement result shown in the index part can be confirmed with the male thread part removed from the female thread, there is an effect that the effective diameter of the female thread can be measured efficiently.

According to the measurement gauge with a female thread effective diameter scale according to claim 2, in addition to the effect produced by the measurement gauge with a female thread effective diameter scale according to claim 1, also for a female thread having an effective diameter smaller than the minimum allowable dimension, The effective diameter can be measured. Therefore, for example, when an internal thread having an effective diameter that approximates the minimum allowable dimension within the allowable limit range of the effective diameter is to be formed, the internal thread effective diameter measuring gauge according to claim 2 is used. By forming the female thread while checking the effective diameter, there is an effect that the female thread can be efficiently formed.

According to the measuring gauge with a female thread effective diameter scale according to claim 3, the outer fitting portion is configured to be slidable along the extending direction of the columnar portion, and one end in the sliding direction of the outer fitting portion is the outer periphery of the male screw portion. When arranged on the side, the other end in the sliding direction is arranged on the outer peripheral side of the columnar part. Since it is formed on one side of the work piece and the screw part is screwed into the screw, the external fitting part is in contact with the one side of the work piece so that the external thread part is screwed into the female screw. As it is done, the outer fitting portion slides to the other end side in the sliding direction. When the male screw part is screwed into the female screw to a position where further screwing is impossible, the index part is shown based on the relative position of the outer fitting part to the columnar part, so the measurement result of the effective diameter of the screw is grasped Shown possible.

In addition, since the indicator portion is provided with a restricting means capable of restricting sliding with respect to the columnar portion of the outer fitting portion, when the male screw portion is screwed into the female screw to a position where further screwing is impossible. The sliding of the outer fitting portion with respect to the columnar portion can be regulated by the regulating means. Thereby, even if it removes an external thread part from a female screw, the relative position with respect to the columnar part of an external fitting part is maintained.

Thus, since the measurement result of the effective diameter of the screw shown in the index portion can be confirmed in a state where the external thread portion is removed from the internal thread, the effective internal diameter of the internal thread according to claim 1 or 2 In addition to the effect of the measuring gauge with scale, there is an effect that the effective diameter of the female screw can be easily grasped.

According to the measuring gauge with a female thread effective diameter scale according to claim 4, when the other end in the sliding direction of the outer fitting portion indicates the minimum value of the effective diameter measurable by the indicator portion, one end side of the male screw portion is At least 0.5 pitch or more protrudes from one end in the sliding direction of the outer fitting portion. Therefore, when the other end in the sliding direction of the outer fitting portion indicates the minimum value of the effective diameter that can be measured by the indicator portion, the male screw portion is screwed into the female screw at least 0.5 pitch or more. Therefore, in addition to the effect of the measurement gauge with an effective diameter scale according to claim 3, there is an effect that an accurate measurement result can be obtained with respect to the measurement of the effective diameter of the female thread.

According to the measurement gauge with an internal thread effective diameter scale of Claim 5, in addition to the effect which the measurement gauge with an internal thread effective diameter scale of Claim 3 or 4 has, the scale by which the external fitting part was attached to the scale part Since the measurement result of the effective diameter of the female screw is visible, the measurement result of the effective diameter of the female screw can be easily grasped.

According to the measuring gauge with a female thread effective diameter scale according to claim 6, the index portion includes a scale indicated by the outer fitting portion of the scale attached to the scale portion and at least one scale adjacent to the scale. It is configured to be visible. Therefore, in addition to the effect produced by the measurement gauge with the internal thread effective diameter scale according to claim 5, the measured value of the effective diameter of the internal thread represented by the scale is grasped based on the scale indicated by the outer fitting portion and the scale adjacent to the scale. There is an effect that can be made easy.

According to the measuring gauge with internal thread effective diameter scale according to claim 7, a numerical value of the effective diameter of the internal thread represented by the scale is attached to a part of the plurality of scales. Therefore, compared to the case where numerical values are assigned to all the scales, even if the interval between multiple scales is narrowed, the number fonts of the numerical values attached to the scales are increased as the number of scales attached with numerical values is reduced. can do. Therefore, in addition to the effect produced by the internal thread effective diameter scale measuring gauge according to claim 6, there is an effect that the measurement result of the effective diameter of the internal thread can be grasped more accurately and easily.

According to the measuring gauge with internal thread effective diameter scale according to claim 8, relative displacement of the external fitting portion with respect to the columnar portion in the rotational direction of the external thread portion is restricted by the restricting means. Therefore, it is possible to avoid the occurrence of a problem that the outer fitting portion is relatively displaced with respect to the columnar portion in the rotation direction of the external thread portion and it is impossible to confirm which scale the outer fitting portion indicates. Therefore, in addition to the effect exhibited by the internal thread effective diameter scale measuring gauge according to any one of claims 5 to 7, there is an effect that the effective diameter of the internal thread can be easily grasped.

According to the internal thread effective diameter scale measuring gauge according to claim 9, in addition to the effect exhibited by the internal thread effective diameter scale measuring gauge according to claim 1, the internal thread portion is threaded. Since the thread thread shape of the external thread is formed following the thread thread shape of the street side plug gauge, the thread bottom and top of the screw thread interfere with the top and bottom of the female thread. Further, there is an effect that it is possible to avoid the occurrence of troubles such that the screw portion cannot be further screwed in and the effective diameter of the female screw cannot be measured accurately.

According to the internal thread effective diameter scale measuring gauge according to claim 10, in addition to the effect of the internal thread effective diameter scale measuring gauge according to any of claims 1 to 9, the maximum outer diameter of the external thread portion Since the value is equivalent to the outer diameter of the female screw, the top of the screw thread interferes with the bottom of the female screw, making it impossible to screw further into the screw part. Therefore, there is an effect that it is possible to avoid the occurrence of a problem such that the measurement cannot be performed.

According to the measurement gauge with a female thread effective diameter scale according to claim 11, in addition to the effect exhibited by the measurement gauge with a female thread effective diameter scale according to any one of claims 1 to 10, After forming a thread whose outer diameter and effective diameter gradually increase from the other end to the other end side, the outer diameter of the male thread part is applied by chamfering at least a part of the thread crest of the male thread part. However, since it is set to be less than the outer diameter of the female screw determined based on the nominal diameter, the top of the thread of the threaded portion interferes with the bottom of the female screw, and further screwing of the threaded portion is impossible. Thus, there is an effect that it is possible to avoid the occurrence of a problem that the effective diameter of the female screw cannot be measured accurately.

(A) is a front view of the gauge in one embodiment of the present invention, and (b) is a rear view of the gauge. (A) is a front view of a gauge, (b) is a partial enlarged front view of a gauge. It is a top view of a gauge.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, with reference to FIG.1 and FIG.2, the gauge 100 in one embodiment of this invention is demonstrated. FIG. 1A is a front view of a gauge 100 according to an embodiment, and FIG. 1B is a rear view of the gauge 100.

As shown in FIG. 1 (a), a gauge 100 is an instrument for measuring the effective diameter of a female screw, and includes a handle portion 10 formed in a substantially hexagonal column shape and one end side in the longitudinal direction of the handle portion 10. The male screw portion 20 disposed on the left side of FIG. 1A and the indicator portion 30 disposed between the handle portion 10 and the male screw portion 20 are mainly provided.

The handle portion 10 is a portion that is gripped by a worker using the gauge 100 with a finger or the like. The male screw portion 20 is a portion where a screw is threaded on the outer peripheral surface. In FIGS. 1 to 3, in order to simplify the drawings and make the description easy to understand, illustration of the thread of the male screw portion 20 is omitted, and the external shape of the male screw portion 20 is schematically illustrated.

The index part 30 is a part where the measurement result of the effective diameter of the female screw is shown, and a columnar part 31 connected to the handle part 10 and the external thread part 20 and an externally slidably fitted to the columnar part 31. The fitting part 32 is mainly provided.

Here, a method for measuring the effective diameter of the internal thread by the gauge 100 will be briefly described. When the male screw portion 20 is screwed into the female screw while the handle portion 10 is held with a finger or the like because it is formed on the one surface side of the work piece, one end in the sliding direction of the outer fitting portion 32 (FIG. 1A ) Left side) abuts on one side of the work piece located at the mouth portion of the female screw. Therefore, as the male screw portion 20 is screwed into the female screw, the outer fitting portion 32 slides to the other end side in the axis O direction of the gauge 100 (right side in FIG. 1A), and the columnar portion of the outer fitting portion 32 The relative position to 31 is displaced.

When a predetermined amount of the male screw portion 20 is screwed into the female screw, the screwing of the male screw portion 20 is restricted, and further screwing is impossible. The operator can obtain the measurement result of the effective diameter of the female screw by grasping the relative position of the outer fitting portion 32 to the columnar portion 31 at this time.

Next, each configuration of the gauge 100 will be described. First, the external thread part 20 is demonstrated with reference to FIG. 2 (a) is a front view of the gauge 100, and FIG. 2 (b) is a partially enlarged front view of the gauge 100, illustrating a state in which a part of the male thread portion 20 and the columnar portion 31 is enlarged. Yes. 2A and 2B show a state where the outer fitting portion 32 is removed from the gauge 100, and a part of the gauge 100 is not shown.

As shown in FIG. 2, the external thread portion 20 is formed with a thread so that the effective diameter gradually increases from one end side to the other end side (from the left side to the right side in FIG. 2 (b)).

In addition, the gauge 100 has a nominal diameter of M10 × 1.25 and a female screw having a grade defined by Japanese Industrial Standard of 6H as a measurement target. In the following, in the external thread portion 20, the effective diameter is determined in accordance with the nominal diameter of the female thread that is the measurement target, and therefore, a portion that coincides with the minimum allowable dimension (9.188 mm) of the effective diameter of the screw is described as “ “Part A”, the effective diameter is determined according to the nominal diameter of the female screw to be measured, and therefore the part that matches the maximum allowable dimension (9.348 mm) of the effective diameter of the screw is “Part B”, male screw A portion of the portion 20 whose effective diameter is 80 μm smaller than the portion A is referred to as “portion C”. Further, the distance from the part C to the part A is L1.

The male thread portion 20 is formed of a complete thread portion formed from the portion A to one end side of the male screw portion 20, and the outer diameter and effective diameter of the screw thread are portions from one end side of the male screw portion 20. It gradually increases at a constant rate toward A. In the present embodiment, the gradient angle α of the effective diameter of the external thread 20 with respect to the axis O is set to 1 degree.

Further, the thread of the male thread portion 20 located between one end side and the part A is formed following the thread of the side plug gauge as determined according to the nominal diameter of the female thread having the same measurement object. ing. Thereby, the malfunction at the time of measuring the effective diameter of a female screw can be prevented.

That is, the effective diameter of the male screw portion 20 gradually increases from one end side to the other end side. For this reason, when the male screw portion 20 is screwed into a portion where the effective diameter is larger than the effective diameter of the female screw to be measured, both flank surfaces of the thread of the male screw portion 20 are As a result, the screw flank surface is clamped, and as a result, further screwing of the male screw portion 20 is restricted. Since the gauge 100 is obtained based on the screwing amount of the male screw portion 20 at this time, the measurement result of the effective diameter of the screw is shown in the indicator portion 30.

Therefore, before the both flank surfaces of the thread portion of the external thread portion 20 are clamped by the flank surface of the internal thread portion, the top portion or the bottom portion of the external thread portion 20 is the portion of the internal thread to be measured. If it interferes with the valley bottom portion or the mountain top portion and further screwing of the screw portion 20 becomes impossible, an accurate measurement result of the effective diameter of the female screw cannot be obtained.

On the other hand, in the gauge 100, the thread of the external thread portion 20 is formed following the angle of the passing plug gauge. Therefore, as long as the total effective diameter of the female screw to be measured is within the specified limit allowable range, the crest portion and the valley bottom portion of the male screw portion 20 are located at the valley bottom portion or the crest portion of the female screw to be measured. Since interference can be avoided, an accurate measurement result can be obtained.

The male screw portion 20 is formed so that the outer diameter and the effective diameter gradually increase from one end side to the other end side, and then the male screw portion 20 is screwed so that the outer diameter of the male screw portion 20 becomes the same size as the part A. The top of the mountain is processed for mountain payment. As a result, the external diameter of the external thread portion 20 gradually increases from one end of the external thread portion 20 to the portion A, whereas the external diameter is constant from the portion A to the other end of the external thread portion 20. ing.

In addition, the part A is set so that the outer diameter of the external thread part 20 is equivalent to the outer diameter of the female screw determined according to the nominal diameter of the same female screw, and from the part A to the other end. The outer diameter of the male screw portion 20 is equal to the outer diameter of the female screw.

Therefore, as long as the total effective diameter of the female screw that is the measurement target is within the limit allowable range defined in the Japanese Industrial Standard, the peak portion of the male screw portion 20 interferes with the valley bottom portion of the female screw that is the measurement target. Can be avoided. Therefore, an accurate measurement result can be obtained when measuring the effective diameter of the female screw.

Next, the columnar part 31 of the index part 30 will be described. The columnar portion 31 is a columnar portion that extends along the direction of the axis O of the gauge 100. In the following description, a part having a length dimension L2 in the direction of the axis O from the part A is “part D”, and is closer to one end side in the sliding direction of the columnar portion 31 than the part D and the axis from the part D. A region where the distance in the O direction is L1 is referred to as “region E”.

The columnar part 31 is provided with a scale part 33 composed of 7 scales on its outer peripheral surface. The scale part 33 is for easily grasping the relative position of the outer fitting part 32 with respect to the columnar part 31 by visual observation, and a numerical value indicating the measurement result of the effective diameter is attached to a part of the scale.

Among the scale parts 33, the scales marked on the part D of the columnar part 31 are given “0” as a numerical value representing the measured value of the effective diameter, and the scales marked on the part E of the columnar part 31 are “−80” is attached as a numerical value representing the measured value of the effective diameter.

Here, in the gauge 100, when the external thread portion 20 is screwed into the female screw whose effective diameter matches the minimum allowable dimension until it cannot be screwed any further, the external fitting portion 32 of the columnar portion 31. A portion where the other end in the sliding direction is located is a portion D, and “0” which is a numerical value indicating an effective diameter in the scale portion 33 is attached to the portion.

Further, in the gauge 100, when the external thread portion 20 is screwed into the female screw whose effective diameter matches the maximum allowable dimension until no further screwing is possible, the outer fitting portion 32 slides with respect to the columnar portion 31. A scale is attached to a portion where the other end of the direction is located, and “+160” is attached to the scale as a numerical value indicating an effective diameter.

In addition, when measuring an internal thread whose effective diameter is the maximum allowable dimension, “+160” is added as a numerical value representing the effective diameter to the scale attached to the portion where the other end in the sliding direction of the outer fitting portion 32 is disposed. The maximum allowable dimension of the effective diameter of the female thread that is the measurement target of the gauge 100 is 9.348 mm, and is a dimension that is 160 μmm larger than the minimum allowable dimension of 9.188 that is the effective diameter of the female thread. caused by. Therefore, the numerical value given to the scale as the numerical value representing the effective diameter is appropriately given an appropriate numerical value based on the minimum and maximum allowable dimensions of the effective diameter determined according to the nominal diameter of the female thread to be measured. Just do it.

In addition, the other end (FIG. 2 (a) left end part) of the external thread part 20 and the one end (FIG. 2 (a) left end part) of the columnar part 31 are smaller in diameter than the external thread part 20 and the columnar part 31. Are connected via a cylindrical connecting portion 40. Thereby, a gap can be provided between the male screw portion 20 and the columnar portion 31 in the direction of the axis O. Therefore, it is possible to prevent the grinding wheel or the like from interfering with the columnar part 31 when the thread of the male screw part 20 is formed with a grinding wheel or the like in the manufacturing process of the gauge 100.

Next, returning to FIG. 1, the outer fitting portion 32 of the indicator portion 30 will be described. The outer fitting portion 32 is a member formed in a columnar shape having an inner diameter larger than the outer diameter of the columnar portion 31, and is configured to be slidable along the axis O direction with respect to the columnar portion 31. The outer fitting portion 32 has a length dimension in the sliding direction (FIG. 1A, left and right direction), and one end in the sliding direction of the outer fitting portion 32 (the left end portion in FIG. 1A) is the outer peripheral side of the external thread portion 20. The other end of the outer fitting portion 32 in the sliding direction (the right end portion in FIG. 1A) is set to a length dimension so as to be arranged on the outer peripheral side of the columnar portion 31.

Here, a method for confirming the measurement result when the effective diameter of the female thread is measured using the gauge 100 will be described. When the male screw portion 20 is screwed into the female screw until further screwing becomes impossible, the scale indicating the measured value of the effective diameter of the screw for measurement is the other end in the sliding direction of the outer fitting portion 32 (FIG. 1). (A) right end). The operator can facilitate the measurement result of the effective diameter of the female screw by visually observing the scale indicated by the other end in the sliding direction of the outer fitting portion 32.

The distance between the part D of the columnar part 31 marked with “0” and the part E of the columnar part 31 marked with “−80” is L1, which is effective. The distance between the part A of the male screw part 20 whose diameter is the minimum allowable dimension and the part C of the male screw part 20 whose effective diameter is 80 μm smaller than the minimum allowable dimension is set to be the same ( (Refer FIG.2 (b)). Further, the distance between the part D of the columnar portion 31 marked with a scale marked “0” and the scale marked with a scale marked “+160” is the distance L1 from the part D to the part E. The distance from the part A of the male screw part 20 to the part B of the male screw part 20 in which the effective diameter is 160 μm larger than the minimum allowable dimension (the effective diameter is the maximum allowable dimension) is This is twice the distance L1 from the part C to the part A (see FIG. 2B).

Further, the distance L2 from the portion A to the portion D (see FIG. 2B) is set so that the external fitting portion 32 is obtained when the male screw portion 20 is screwed into the female screw until further screwing becomes impossible. The length is set such that a scale indicating the measured value of the effective diameter of the screw is indicated by the other end in the sliding direction.

In this way, the screwing amount of the male screw portion 20 with respect to the female screw is associated with the scale indicated by the outer fitting portion 32 (see FIG. 1A) that slides as the male screw portion 20 is screwed. Therefore, the screwing amount of the male screw portion 20 with respect to the female screw can be visually shown on the indicator portion 30.

Therefore, in the gauge 100, the measurement result of the effective diameter of the female screw is visibly displayed on the indicator portion 30. Therefore, the measurement result can be easily and immediately grasped compared to the case where the threaded amount of the male thread portion 20 is measured with a scale or the like and the effective diameter of the female thread is derived from the measured value. The work of measuring the effective diameter of the screw can be simplified.

Further, the outer fitting portion 32 includes a scale confirmation portion 34 that is notched from the other end in the sliding direction (right end portion in FIG. 1A) toward one end side in the sliding direction (left side in FIG. 1A). ing.

This scale confirmation part 34 is a part for making it possible to visually check the scale attached to one end in the sliding direction from the other end of the external fitting part 32 in the scale part 33. The scale confirmation unit 34 has a measured value of the effective diameter even in a state where the other end in the sliding direction of the outer fitting part 32 points to a scale with “+160” that is a numerical value representing the measured value of the effective diameter. The scale to which “−80”, which is a numerical value representing “”, is configured to be visible from the scale confirmation unit 34.

Therefore, for a scale that is not marked with a numerical value that represents the measured value of the effective diameter, it is easy to determine the number of measured values of the effective diameter indicated by the scale from the numerical values that are attached to the scales before and after the scale. Can grasp.

For example, when the other end in the sliding direction of the outer fitting portion 32 indicates a scale adjacent to one end in the sliding direction of the scale with “+160”, the scale further adjacent to one end in the sliding direction is “ It can be visually observed through the scale confirmation unit 34 that “+80” is attached. Thereby, it can be easily grasped that the measured value of the effective diameter represented by the scale indicated by the other end in the sliding direction of the outer fitting portion 32 is “+120”.

Further, even when the other end in the sliding direction of the outer fitting portion 32 is located at a position overlapping one of the scale portions 33, the other end in the sliding direction of the outer fitting portion 32 is confirmed by checking the scale confirmation portion 34. The positional relationship with the scale can be grasped.

As described above, since the outer fitting portion 32 is provided with the scale confirmation portion 34, the measurement result of the effective diameter of the female screw can be easily and immediately grasped. As a result, the measurement operation of the effective diameter of the female screw can be performed. It can be done efficiently.

Further, in the scale portion 33, a numerical value indicating the measured value of the effective diameter is attached to a part of the plurality of scales. As a result, even if the interval between adjacent scales is narrowed, the number fonts attached to the scales can be increased as the number of scales attached with numerical values decreases. Therefore, the measurement result of the effective diameter of the female screw can be grasped more accurately and easily.

The scale confirmation unit 34 has a length dimension in the slide direction (left and right direction in FIG. 1 (a)), which is a length dimension at which at least two scales can be viewed from the scale confirmation unit 34, that is, the scale unit 33. It is sufficient that the length dimension is set to be twice or more the interval between the scales. Further, the scale confirmation unit 34 is set to have a length dimension in the circumferential direction around the axis O so that at least a part of the scale and a numerical value attached to the scale can be visually observed from the scale confirmation unit 34. Just do it.

As shown in FIG. 1B, the columnar portion 31 is provided with a groove 31a extending along the direction of the axis O, and the external fitting portion 32 is a screw hole into which a female screw is threaded. 32a is formed. In addition, in FIG.1 (b), in order to simplify drawing and to make description easy to understand, the screw hole 32a formed in the external fitting part 32 is typically shown with the broken line.

The fixing screw 35 is constituted by a bolt having a male screw that can be screwed into the screw hole 32a, and the tip end portion (the rear end portion in the vertical direction in FIG. 1B) can be inserted into the groove portion 31a. In a state where the tip of the fixing screw 35 is inserted into the groove 31a, the fixing screw 35 is configured to be guided along the longitudinal direction of the groove 31a (the left-right direction in FIG. 1 (c)). At this time, displacement of the fixing screw 35 in the direction other than the direction of the axis O is restricted, and the external fitting portion 32 is in a circumferential direction with respect to the columnar portion 31 (a circumferential direction centering on the axis O, the screw of the external thread portion 20 Relative rotation in the direction of rotation) is restricted. Accordingly, the outer fitting portion 32 is displaced relative to the columnar portion 31 in the rotation direction of the male screw portion 20 (circumferential direction around the axis O), and the scale portion attached to the columnar portion 31 from the scale confirmation portion 34. 33 can be prevented from being invisible. That is, since it is possible to avoid the occurrence of a problem that it is impossible to visually check which scale the outer fitting part 32 indicates among the scale parts 33 attached to the columnar part 31, the effective diameter of the female screw can be easily grasped. .

Further, when the fixing screw 35 is screwed in a predetermined amount, the outer fitting portion 32 is sandwiched and fixed between the fixing screw 35 and the columnar portion 31, and the sliding of the outer fitting portion 32 with respect to the columnar portion 31 is restricted. As described above, in the index portion 30, the sliding of the outer fitting portion 32 with respect to the columnar portion 31 can be allowed or restricted by adjusting the screwing amount of the fixing screw 34.

In a state where the fixing screw 35 is not strongly screwed into the hole 31a formed in the columnar portion 31, the fixing screw 35 can be slid integrally with the outer fitting portion 32 along the longitudinal direction of the hole 31a. it can. Therefore, the external fitting portion 32 can be slid with respect to the columnar portion 31 by screwing the male screw portion 30 into the female screw in this state.

Next, with reference to FIG. 3, a usage mode of the gauge 100 will be described. FIG. 3 is a top view of the gauge 100. FIG. 3A shows a state in which the male thread portion 20 is screwed into the female thread T1 by the gauge 100 until it cannot be screwed any further. 3 (b) shows a state in which the external thread portion 20 has been screwed into the female screw T2 by the gauge 100 until further screwing is impossible, and FIG. 3 (c) shows the gauge 100. The state in which the external thread portion 20 is screwed into the internal thread T3 is further illustrated until further screwing is impossible. In FIG. 3, in order to simplify the drawing and make the description easy to understand, portions of the external thread portion 20, the columnar portion 31, and the connecting portion 40 that are externally fitted to the external fitting portion 32 are illustrated by broken lines. Yes.

The internal threads T1 to T3 are internal threads in the manufacturing process for the purpose of forming internal threads having a nominal diameter of M10 × 1.25 and a Japanese Industrial Standard grade of 6H. The internal thread T2 is a female thread having an effective diameter equal to the minimum allowable dimension, and the internal thread T3 is an internal thread having an effective diameter equal to the maximum allowable dimension.

As shown in FIG. 3, since the effective diameter of the screws T1 to T3 is formed on one surface side of the workpiece W, which is a workpiece, and the effective diameter of the internal thread is measured using the gauge 100, further screwing is required. The male screw portion 20 is screwed into the female screw to be measured until it becomes impossible. At this time, one end in the sliding direction of the outer fitting portion 32 abuts on one surface side of the workpiece W, so that the outer fitting portion 20 moves to the other end side in the sliding direction as the male screw portion 20 is screwed into the female screws T1 to T3. Slide to.

As shown in FIG. 3A, when the external thread portion 20 is screwed into the female screw T1 until further screwing is impossible, the position of the other end in the sliding direction of the external fitting portion 20 is graduated. In the portion 33, it coincides with the position of the scale marked with “−80” which is a numerical value indicating the effective diameter (see FIG. 1). Thereby, the operator can grasp that the effective diameter of the female screw T1 is a dimension that is 80 μm smaller than the minimum allowable dimension.

Thus, the measurement result of the effective diameter of the female thread T1 whose effective diameter is smaller than the minimum allowable dimension of the effective diameter of the female thread to be measured is shown in the indicator section 30. Thus, for example, when an operator tries to form a female screw having an effective diameter that is close to the minimum allowable dimension among the allowable critical dimensions of the effective diameter, the worker sequentially confirms the effective diameter of the female screw in the manufacturing process. However, fine adjustment of the effective diameter of the female screw can be performed. Therefore, the internal thread can be formed with high accuracy and efficiency.

Further, the gauge 100 has a lower limit of the effective diameter that can be grasped by the scale portion 33 is 80 μm smaller than the minimum allowable dimension, whereas the male thread 20 has an effective diameter that is 80 μm smaller than the minimum allowable dimension. The portion A (see FIG. 2B) is located at a distance of 0.5 pitch or more from the one end (left end portion in FIG. 3A) of the male screw portion 20 to the other end side. Thus, when the other end in the sliding direction of the outer fitting portion 32 indicates a scale with “−80”, the external thread portion 20 protrudes from the one end in the sliding direction of the outer fitting portion 32 by at least 0.5 pitch or more. The protruding portion is screwed into the female screw.

Here, when the chamfering process is applied to the mouth portion of the female screw to be measured, the effective diameter of the female screw mouth portion does not necessarily match the effective diameter of the whole female screw.

Further, in a state where the screwing amount of the male screw part 20 with respect to the female screw is less than 0.5 pitch, even if the screwing of the male screw part 20 beyond that is restricted, the male screw part 20 is more than that. The restriction of screwing is that the central part of both flank surfaces of the thread of the male thread portion 20 (the part where the virtual cylinder having the effective diameter is in contact with the flank surface) is the flank of the thread surface of the female thread. There is a possibility that it is not caused by being pinched between the central portion (the portion where the virtual cylinder having the effective diameter as a diameter and the flank surface is in contact).

Thus, even if the further screwing of the male screw part 20 is restricted in a state where the screwing amount of the male screw part 20 with respect to the female screw is less than 0.5 pitch, The indicated measurement result may not be accurately reflected as the measurement result of the effective diameter of the female screw.

On the other hand, in the gauge 100, when the outer fitting portion 32 points to a scale marked with “−80”, which is the lower limit that can be grasped by the scale portion 33, the male screw portion 20 is at least relative to the female screw. It is thought that 0.5 pitch or more is screwed. In this case, in a part of the male screw portion 20, the central portion of both flank surfaces of the thread of the male screw portion 20 is sandwiched between the central portions of the flank surfaces of the female screw thread, resulting in this. It is considered that screwing of the threaded portion 20 into the female screw is restricted. Thereby, since the reliability can be improved as a measurement result shown in the indicator part 30, an accurate measurement result can be obtained regarding the measurement of the effective diameter of the female screw.

As shown in FIG. 3B, when the external thread portion 20 is screwed into the female screw T2 until further screwing is impossible, the position of the other end in the sliding direction of the outer fitting portion 20 is a scale. In the portion 33, it coincides with the position of the scale marked with “0”, which is a numerical value indicating the effective diameter. Thereby, the operator who used the gauge 100 can grasp | ascertain that the effective diameter of the internal thread T2 corresponds to the minimum allowable dimension.

In the male thread portion 20, the thread formed in the range from one end side to the portion A (see FIG. 2B) is a complete thread portion, and is formed following the chevron shape of the street side plug gauge. Yes. As a result, as long as the total effective diameter of the female screw to be measured is within the specified limit allowable range, the crest portion and the trough portion of the female screw portion 20 are Interference with the part can be avoided. In other words, the bottom and top of the threaded portion of the threaded portion 20 interfere with the top and bottom of the threaded thread of the female screw, and further screwing of the male threaded portion 20 becomes impossible, and the effective diameter of the female thread is accurately set. Since it is possible to avoid the occurrence of problems such as being unable to measure, accurate measurement results can be obtained.

As shown in FIG. 3 (c), when the external thread portion 20 is screwed into the female screw T3 until further screwing is impossible, the position of the other end in the sliding direction of the external fitting portion 20 is the scale. In the portion 33, it coincides with the position of the scale marked with “+160” which is a numerical value indicating the effective diameter. Thereby, the operator who used the gauge 100 can grasp | ascertain that the effective diameter of the internal thread T3 corresponds with the maximum permissible dimension.

The external thread diameter of the external thread part 20 from the part A to the other end side of the external thread part 20 is subjected to thread threading, and the external diameter of the external thread part 20 is determined according to the nominal diameter. It is less than the outer diameter of the female thread. Therefore, the top of the thread portion of the thread portion 20 interferes with the bottom of the female screw, so that no further screwing of the external thread portion 20 is possible, and the effective diameter of the female screw cannot be measured accurately. Therefore, accurate measurement results can be obtained.

Furthermore, the external diameter from the part A to the other end side of the external thread part 20 of the external thread part 20 is equal to the external diameter of the female thread determined according to the nominal diameter. Therefore, as long as the female thread to be measured is within the allowable limit range, the top of the thread of the threaded portion 20 interferes with the bottom of the female thread, and further screwing of the threaded portion 20 becomes impossible. It is possible to avoid the occurrence of a problem such that the effective diameter of the screw cannot be measured accurately. Therefore, an accurate measurement result can be obtained.

In addition, the indicator portion 30 is configured such that the slide with respect to the columnar portion 31 of the outer fitting portion 32 can be regulated by a fixing screw 35. Therefore, when the male screw portion 20 is screwed into the female screw to be measured until further screwing is impossible, the sliding with respect to the columnar portion 31 of the outer fitting portion 32 is restricted by the fixing screw 35. Even if the male screw portion 20 is removed from the female screw, the relative position of the outer fitting portion 32 with respect to the columnar portion 31 can be maintained.

Thereby, since the operator can confirm the measurement result of the effective diameter of the screw shown in the index part 30 after removing the external thread part 20 from the internal thread, the work of measuring the effective diameter of the internal thread can be performed efficiently. be able to.

Further, when the male screw portion 20 is screwed into the female screws T1 to T3, the relative rotation of the outer fitting portion 32 with respect to the columnar portion 31 is restricted by the fixing screw 35. Accordingly, the outer fitting portion 32 is displaced relative to the columnar portion 31 in the rotation direction of the male screw portion 20 (circumferential direction around the axis O), and the scale portion attached to the columnar portion 31 from the scale confirmation portion 34. Since 33 can be prevented from being invisible, the effective diameter of the female screw can be easily grasped.

In the present embodiment, it is preferable that the gradient angle α (see FIG. 2B) of the effective diameter of the male screw portion 20 is set within a range of 0.3 degrees or more and 2 degrees or less.

That is, when the gradient angle α of the effective diameter of the external thread part 20 is less than 0.3 degrees, the interval between the scales of the scale part 33 becomes wide, so that the measurement result shown in the index part 30 becomes ambiguous and the internal thread It is difficult to accurately grasp the effective diameter of On the other hand, when the gradient angle of the effective diameter of the external thread part 20 is larger than 2 degrees, the interval between the scales of the scale part 33 becomes narrow, so that the measurement result shown in the index part 30 becomes ambiguous and the internal thread It is difficult to accurately grasp the effective diameter of

Therefore, the measurement result of the effective diameter of the female thread is set by setting the gradient angle α (see FIG. 2B) of the effective diameter of the male thread portion 20 within a range of 0.3 degrees or more and 2 degrees or less. Can be easily grasped.

As described above, in the gauge 100, the measurement result of the effective diameter of the female screw is obtained by inserting the male screw portion 20 into the female screw to be measured until no further screwing is possible. Visible at 30. Furthermore, the measurement result shown in the indicator portion 30 can be confirmed in a state where the male screw portion 20 is removed from the female screw. Therefore, the effective diameter of the female screw can be measured efficiently.

The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

The numerical values given in the above embodiment are merely examples, and other numerical values can naturally be adopted. In particular, any value can be adopted as the value specified by the numerical range in which the lower limit and the upper limit are specified as long as the value is within the numerical range.

In the above embodiment, the case where the lower limit of the effective diameter of the female screw that can be grasped by the scale portion 33 is -80 μm smaller than the minimum allowable dimension of the effective diameter has been described. However, the present invention is not necessarily limited to this. Alternatively, the lower limit value of the effective diameter of the female screw that can be grasped by the scale portion 33 may be changed as necessary. For example, the number of scales may be increased so that measurement can be performed to a dimension that is −120 μm smaller than the minimum allowable dimension of the effective diameter, and the scale may be measured to be −40 μm smaller than the minimum allowable dimension of the effective diameter. You may reduce the number of Further, according to the purpose of use, the effective diameter of the female screw that can be grasped by the scale portion 33 may be the same as the minimum allowable dimension or larger than the minimum allowable dimension.

In the above embodiment, the case where the gradient angle of the effective diameter of the external thread portion 20 is 0.3 degrees or more and 2 degrees or less has been described. However, the gradient angle of the effective diameter of the external thread portion 20 is less than 0.3 degrees. Alternatively, the angle may be larger than 2 degrees. For example, while narrowing the range of the effective diameter of the female screw that can be grasped by the scale portion 33 (for example, while setting the difference between the lower limit and the upper limit of the effective diameter of the female screw that can be grasped by the scale portion 33), the external thread portion 20 When the effective diameter of the internal thread is made moderate (for example, less than 0.3 degrees), the interval between the scales attached to the columnar portion 31 can be increased or the number of scales can be increased. Can be measured with higher accuracy. Similarly, the range of the effective diameter of the female screw that can be grasped by the scale portion 33 is increased (for example, while the difference between the lower limit and the upper limit of the effective diameter of the female screw that can be grasped by the scale portion 33 is set to 320), When the effective diameter of 20 is abruptly (for example, an angle larger than 2 degrees), the interval between the scales can be widened or the number of scales can be increased. Can be measured.

In the above-described embodiment, the case where the scale attached to the scale portion 33 is indicated by the other end in the sliding direction of the external fit portion 32 is not limited to this. A mark or the like serving as a mark may be attached to the position, and the scale may be indicated by the mark or the like.

Moreover, although the scale confirmation part 34 demonstrated the case where the scale confirmation part 34 was notched and formed toward the one end side from the other end of the external fitting part 32 in the said embodiment, it is not necessarily restricted to this, For example, outside The fitting part is formed in a substantially C-shaped cross section, and the scale attached to the scale part 33 can be seen from the gap formed between the circumferential direction one end part and the other end part of the outer fitting part. Alternatively, a window hole portion that allows the scale portion 33 to be viewed may be formed through the outer fitting portion 32.

Furthermore, although the case where the scale confirmation part 34 was provided in the external fitting part 32 was demonstrated in the said embodiment, it is not necessarily restricted to this, The scale confirmation part 34 may be abbreviate | omitted. In this case, the outer fitting portion may be made of a transparent material so that the scale portion 33 attached to the columnar portion 31 can be seen from the outer fitting portion.

In the above embodiment, the

holes

31a and 32a are formed in the columnar portion 31 and the outer fitting portion 32, and the fixing screws are fitted into the

holes

31a and 32a formed in the columnar portion 31 and the outer fitting portion 32, so that the outer Although the case where relative displacement in the circumferential direction (a circumferential direction centering on the axis O and a screw rotation direction of the external thread portion 20) with respect to the columnar portion 31 of the fitting portion 32 is described has been described, it is not necessarily limited thereto. The relative displacement in the circumferential direction with respect to the columnar part 31 of the outer fitting part 32 may be regulated by other methods. As another example, for example, a rib extending along the direction of the axis O is formed on either the columnar portion 31 or the outer fitting portion 32, and a groove corresponding to the rib formed on the other is columnar. Displacement of the outer fitting part 32 in a direction other than the sliding direction may be restricted by forming the rib 31 and the groove on either the part 31 or the outer fitting part 32.

100 gauge (measuring gauge with female thread effective diameter scale)
20 Male thread part 30 Index part 31 Columnar part 32 Outer fitting part 33 Scale part 35 Fixing screw (regulation means)
O axis

Claims

A male screw part with a male screw whose effective diameter gradually increases from one end side toward the other end side, and a scale indicated by the measurement result of the effective diameter of the female screw disposed on the other end side of the male screw part And an indicator part marked with,
Measured based on the threaded amount of the male threaded part into the female thread when the male threaded part is threaded into the female thread with a constant effective diameter from one end and no further threading is possible. Therefore, the measurement result of the effective diameter of the female screw is configured so that the index portion can be confirmed in a state where the measurement result of the effective diameter of the screw is removed from the female screw.
The effective diameter of the female screw according to claim 1, wherein the effective diameter of the female screw having an effective diameter smaller than a minimum allowable dimension of the effective diameter of the female screw determined according to the nominal diameter is configured to be measurable. Measuring gauge with scale.
The indicator portion is connected to the other end of the male screw portion and extends along the axial direction of the male screw, and is externally fitted to be slidable in the extending direction of the columnar portion. When one end in the sliding direction is disposed on the outer peripheral side of the external thread portion, an outer fitting portion in which the other end in the sliding direction is disposed on the outer peripheral side of the columnar portion, and sliding of the outer fitting portion with respect to the columnar portion is performed. A regulation means that can be regulated,
3. The internal thread effective according to claim 1, wherein the index portion is provided so that a measurement result of an effective diameter of the internal thread can be grasped based on a relative position of the outer fitting portion with respect to the columnar portion. Measuring gauge with diameter scale.
When the external fitting portion indicates the minimum effective diameter measurable by the indicator portion, the male screw portion has at least one end side of the male screw portion from the one end in the sliding direction of the external fitting portion. 4. The measuring gauge with a female thread effective diameter scale according to claim 3, wherein the measuring gauge protrudes more than the pitch.
The columnar part includes a scale part with a plurality of scales, and the external fitting part indicates the scale attached to the scale part, so that the measurement result of the effective diameter of the female screw can be visually observed. The measuring gauge with a female thread effective diameter scale according to claim 3 or 4.
The scale of the index part is configured such that, of the scales attached to the scale part, the scale indicated by the external fitting part and at least one scale adjacent to the scale are visible. 5. A measuring gauge with a female thread effective diameter scale according to 5.
The measurement scale with an internal thread effective diameter scale according to claim 6, wherein the scale portion is provided with a numerical value of an effective diameter of the internal thread represented by the scale on a part of the multiple scales.
The female screw effective diameter according to any one of claims 5 to 7, wherein the restricting means restricts relative displacement of the external fitting portion in the rotation direction of the male screw portion with respect to the columnar portion. Measuring gauge with scale.
9. The male thread portion according to any one of claims 1 to 8, wherein a thread-shaped threaded male thread is formed following a thread-shaped plug gauge thread according to a nominal diameter. Measuring gauge with effective female thread diameter scale as described.
10. The internal thread effective according to claim 1, wherein the external thread has a maximum outer diameter equal to an external diameter of the internal thread determined based on a nominal diameter. Measuring gauge with diameter scale.
The male thread portion is formed with a thread whose outer diameter and effective diameter gradually increase from one end side to the other end side, and then is subjected to threading on at least a part of the top of the thread portion of the male thread portion. The external diameter of the external thread is set to be equal to or smaller than the external diameter of the internal thread determined based on the nominal diameter. Measuring gauge with diameter scale.