JP2006300659A - Bolt gauge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a durable bolt gauge capable of measuring the length of screw part of a bolt correctly and simply. <P>SOLUTION: In the bolt gauge 1 a gauging section 2 and a concave portion 3 are arranged. In the gauging section 2, a first measuring scale 2a is marked so as to initiate from a boundary section 4 between the gauging section 2 and the concave portion 3. Inserting the head 10b of bolt 10 into the concave portion 3 so as to abut the undersurface 10c to the abutment surface 3a of concave portion 3, the length of screw part 10a of the bolt 10 can be measured and also discriminate application (reuse) limits of the bolt 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bolt measuring instrument, and in particular, relates to a bolt measuring instrument that can accurately measure the length of a body part (screw part) of a bolt and has excellent durability.

  Usually, a bolt having a thread portion used when assembling a machine is tightened to a nut by applying a predetermined torque. Specifically, in the strain-stress curve of the steel type of the bolt to be used, a torque corresponding to a plastic region exceeding the elastic region is applied to the bolt and tightened. For example, the cylinder head of an automobile engine and the bolting of a connecting rod are performed by such a method. This method is generally called a plastic zone fastening method.

  By the way, when disassembling and repairing the engine, the bolt that is tightened is loosened and removed, the engine is overhauled, and then the bolt is tightened again by the tightening method as described above, and the engine is reassembled. However, since the bolt tightened in the plastic region is not tightened in the elastic region when it is removed, the thread length of the bolt does not recover to the initial length before use, and permanent deformation occurs. Corresponding plastic elongation remains, and the length of the bolt thread portion becomes slightly longer than the initial value. In this way, when the plastic zone tightening and removal are repeated a plurality of times, the plastic elongation described above accumulates each time, so that the threaded portion of the bolt becomes gradually longer. If this cumulative plastic elongation exceeds a certain allowable value, for example, a threaded portion of a bolt is constricted and the strength is remarkably lowered, so that it cannot be used for plastic fastening with ensured reliability.

  Therefore, when the plastic elongation exceeds a certain allowable value, it is necessary to replace the bolt with a new one in order to ensure the reliability of the assembled engine. Therefore, it is necessary to determine the use limit of the bolt used in the plastic zone tightening method by some method.

Therefore, Patent Document 1 discloses a bolt thread length gage for determining whether or not a bolt used for plastic zone tightening can be reused. The bolt thread length gauge will be described with reference to FIGS. 4 (a) and 4 (b). FIGS. 4A and 4B are perspective views showing the structure of the bolt thread length gauge 20. As shown in FIG. 4A, the bolt screw portion length gauge 20 is configured to insert a screw portion 22b of a bolt used for fastening the plastic region into the hollow portion 20a. The hollow portion 20a is smaller in diameter than the head portion 22a of the bolt 22, and its total length is longer than the initial value of the screw portion 22b of the bolt before use, and the allowable value of plastic elongation of the screw portion 22b is added to the initial value. It is comprised so that it may become below length. By using this bolt screw length gauge 20, for example, when a bolt is inserted and the tip of the screw portion 22b further extends from the hollow portion 20a as shown in FIG. 4B (B in the figure), this bolt Can determine that the plastic elongation exceeds the allowable value, and replace the bolt with a new one. The use (reuse) limit of the bolt can be determined by such a method.
Japanese Utility Model Publication No. 5-8404 (published February 5, 1993) Design Registration No. 586514 (Registered July 30, 1982)

  However, the bolt screw length gauge 20 shown in FIGS. 4A and 4B as described above is configured to insert the screw portion 22b including the neck lower portion 22c that does not have the screw thread of the bolt into the hollow portion 20a. Therefore, there is a problem that an operation of inserting the bolt every time it is attempted to determine the use (reuse) limit of the bolt is complicated.

  In addition, although the use (reuse) limit of the bolt can be easily determined, since it is only possible to determine whether or not it is possible, the actual length of the lower neck portion 22c and the actual length of the screw portion 22b are measured (actual measurement). ) There is a problem that can not be.

  By the way, Patent Document 2 discloses a ruler that can be used when actually measuring the length of the screw portion of the bolt. The structure of this ruler is shown in FIG. The internal method measurement ruler 30 shown in FIG. 5 has scales formed not only at the center but also at the end. Therefore, for example, by arranging the end portion P of the internal ruler 30 directly below the head portion 22a of the bolt 22 as shown in FIG. 5, the lengths of the screw portion 22b and the neck lower portion 22c of the bolt 22 can be measured. By actually measuring the length in this way, the use (reuse) limit of the bolt can be strictly determined.

  However, since the end portion of the internal measurement ruler 30 shown in FIG. 5 is exposed to the external environment, some impact is applied to the end portion from the external environment when the internal measurement ruler 30 is stored or transported. Very likely to be damaged by. Needless to say, if the end portion is broken, it is impossible to actually measure the length of the lower neck.

  Therefore, the present invention has been made in view of the above problems, and its purpose is to be able to measure the length of the threaded part of the bolt and the lower part of the neck and to determine the use limit accurately and simply. An object of the present invention is to provide a bolt measuring instrument having excellent durability.

  In order to solve the above-described problem, a bolt measuring instrument according to the present invention measures a length of a body portion of a bolt including a body portion and a head portion provided at one end of the body portion. A measuring part provided with a first measurement scale at least in part, wherein the measuring part is arranged in a state along the central axis of the torso, and the measuring part includes Is characterized by being provided with a recess in which an abutting surface is formed so that the head can be inserted and the lower surface of the head abuts. Further, for example, the body portion may be a screw portion having a thread.

  With the above-described configuration, the bolt measuring instrument of the present invention can measure the length of the body part (the threaded part in the case of having a thread), and can produce some impact from the external environment during storage and transportation. Even when the bolt is added to the bolt measuring instrument, it is possible to provide a bolt measuring instrument excellent in durability capable of remarkably reducing the influence.

  Specifically, if the bolt measuring instrument of the present invention is used, since the measurement scale is formed from the boundary portion in the measurement portion, the head portion of the bolt is inserted into the concave portion, and By arranging the central axis along the measurement part, the length of the trunk part can be measured accurately. Moreover, the length of the neck lower part without a thread which has been a problem in the prior art can be measured.

  Further, according to the bolt measuring instrument of the present invention, the bolt can be used (reused) by a simple operation of arranging the central axis of the trunk portion along the measuring portion and visually observing the measurement scale formed on the measuring portion. The limit can be determined.

  Therefore, the use (reuse) limit of the bolt can be easily determined without requiring a complicated operation as in the prior art.

  In addition, when a bolt is disposed in the measurement unit in order to actually measure the length of the body part, the lower surface of the head part comes into contact with a contact surface provided in the recess. Here, since the contact surface is configured in the recess, even if some impact is applied to the bolt measuring instrument from the external environment during storage or transportation, even if the boundary is damaged, the impact is not generated in the recess. It does not extend to the contact surface formed on the contact surface, and the contact surface is not damaged.

  Thereby, in actual use of the bolt measuring instrument of the present invention, it is possible to always contact the lower surface of the head to the contact surface even when stored or transported. The length can always be measured accurately. That is, with the above configuration, a bolt measuring instrument having excellent durability can be provided.

  Further, in the bolt measuring instrument according to the present invention, it is preferable that a second measurement scale for measuring at least the diameter of the head is formed on the surface of the recess facing the contact surface.

  With the above configuration, in addition to the above effect that the length of the body of the bolt can be measured, the diameter of the head can be measured.

  In addition to the diameter of the head, the second measurement scale can also actually measure the thickness of the head, the diameter of the trunk, and the length of the screw portion.

  In the bolt measuring instrument according to the present invention, it is preferable that a third measurement scale for measuring at least the thickness of the head is formed on the bottom surface of the recess.

  With the above configuration, in addition to the above-described effect that the length of the body of the bolt can be measured, the thickness of the head can be measured.

  In addition to the thickness of the head, the third measurement scale can also measure the diameter of the trunk.

  In addition, the bolt measuring instrument according to the present invention has a first measurement scale formed on the side where the contact surface is formed in the measurement unit as viewed from the concave portion, and the other side has the above-described contact. It is preferable that the height from the bottom of the recess is higher than the side on which the contact surface is formed.

  By setting it as said structure, in addition to said effect that the bolt measuring device of this invention can measure the length of the trunk | drum of a volt | bolt, it can improve the durability of the said boundary part more.

  Specifically, the bolt measuring instrument according to the present invention is configured as described above, so that the height from the bottom of the recess to the other side is higher than the height from the bottom to the boundary. The Thereby, the boundary is protected by the other side. Therefore, by setting it as said structure, durability of a boundary part can be improved more, Therefore durability of the bolt measuring device of this invention can be improved more.

  As described above, the bolt measuring instrument according to the present invention is a bolt measuring instrument that measures the length of the body of the bolt including the body and the head provided at one end of the body. And a measuring unit configured to be able to arrange the torso in a state along the central axis of the torso, and provided with a first measurement scale at least in part. And a recess having an abutting surface formed so that the lower surface of the head abuts is provided.

  By adopting the above configuration, the bolt measuring instrument of the present invention can measure the length of the body part, and it is a case where some impact is applied to the bolt measuring instrument from the external environment during storage and transportation. However, it is possible to provide a bolt measuring instrument excellent in durability that can significantly reduce the influence thereof.

  An embodiment of the present invention will be described below with reference to FIGS. 1 (a) to 1 (c) to FIGS. 3 (a) and 3 (b).

  In the following description, various technically preferable limitations for carrying out the present invention are given, but the scope of the present invention is not limited to the following embodiments and drawings.

  Further, in the present embodiment, a plate-like bolt measuring instrument will be described. However, the bolt measuring instrument of the present invention is not limited to a plate-like one, and has a configuration described in the claims. For example, a structure such as a rectangular parallelepiped or a cylinder may be used.

  1A to 1C show the configuration of the bolt measuring instrument 1 in the present embodiment, FIG. 1A is a plan view of the bolt measuring instrument 1, and FIG. It is the perspective view of the said bolt measuring device 1 which looked at the bolt measuring device 1 shown to a) from the arrow A direction in a figure, FIG.1 (c) is the arrow in a figure in the bolt measuring device 1 shown to Fig.1 (a). It is a side view of the said bolt measuring device 1 seen from the B direction. The bolt measuring instrument 1 shown in FIGS. 1 (a) to 1 (c), for example, determines the use (reuse) limit of a bolt used for bolting a cylinder head or a connecting rod of an automobile engine, and / or a screw part. It can be used to measure the length. Therefore, the bolt measuring instrument 1 is provided with a measuring section 2 and a recess 3 as shown in FIGS.

  The measurement unit 2 is configured to be able to measure the length of a screw part (body part) having a screw thread in a bolt.

  In the present invention, the “screw portion” is composed of a portion where a screw thread is formed and a portion where no screw thread is formed (hereinafter referred to as a neck lower portion).

  Thus, in order to actually measure the length of the screw portion, the measurement portion 2 is provided with the first measurement scale 2a. Specifically, the first measurement scale 2a is formed with a scale for actually measuring the length from the boundary portion 4 (FIGS. 1A and 1C) that is the boundary between the measurement unit 2 and the recess 3. .

  For example, as will be described later, by arranging the screw portion of the bolt in the measuring portion 2 along the central axis of the screw portion of the bolt, the length of the screw portion can be measured using the measuring portion 2. It is also possible to actually measure the length of the neck. As a result, in bolts that are tightened by the plastic region tightening method as described above, even if the screw thread of the bolt becomes longer than the initial length due to plastic elongation due to repeated plastic region tightening and removal multiple times, measurement is possible. The length can be measured in part 2. That is, the bolt measuring instrument 1 in the present embodiment can measure the amount of elongation due to plastic elongation and can determine the limit of use (reuse) of the bolt.

  In the present embodiment, the first measurement scale 2a is formed on the flat surface portion (side surface portion) of the bolt measuring instrument 1 as shown in FIG. However, the present invention is not limited to this, and for example, the first measurement scale 2a may be formed on the surface of the measurement unit 2 shown in FIG. .

  The recess 3 will be described with reference to FIG. FIG. 2 is a plan view of the bolt measuring instrument 1 and the bolt 10 showing the configuration of the bolt measuring instrument 1 of the present embodiment shown in FIG. is there.

  As shown in FIG. 2, the bolt 10 includes a screw portion (body portion) 10 a having a thread and a head portion 10 b.

  The recess 3 provided in the bolt measuring instrument 1 is configured so that the head 10b can be inserted as shown in FIG. Specifically, a contact surface 3a with which the lower surface 10c of the head 10b contacts is provided in the recess 3.

  As described above, the bolt measuring instrument 1 according to the present embodiment has the first measurement scale formed from the boundary portion 4 by arranging the bolt 10 so that the lower surface 10 c contacts the contact surface 3 a of the recess 3. The length of the screw portion 10a can be actually measured using 2a.

  Further, in the conventional internal measurement ruler 30 (FIG. 5), since the end portion where the scale is formed is exposed to the external environment, the internal measurement ruler 30 is shocked from the external environment when being stored or transported. There is a concern that this end may be damaged. On the other hand, in the bolt measuring instrument 1 of the present embodiment, when the bolt 10 is arranged in the measuring unit 2, the bolt 10 (specifically, the lower surface 10c) is arranged with reference to the contact surface 3a. Therefore, even if the boundary portion 4 is damaged due to an impact from the external environment, the contact surface 3a is configured inside the recess 3 as shown in FIG. 1 (a) and FIG. The possibility of receiving an impact from the external environment is extremely low, and if the lower surface 10c can come into contact with the contact surface 3a, there is no influence on the actual measurement of the length of the screw portion 10a. Therefore, since the contact surface 3a can always be maintained by adopting the configuration of the bolt measuring instrument 1 according to the present embodiment, the conventional problem that measurement is impossible due to breakage is a problem with the bolt measuring instrument 1. Does not occur. That is, it can be said that the bolt measuring instrument 1 is excellent in durability.

  In addition, the shape of the said recessed part 3 will not be specifically limited if the head 10b can be inserted. The size of the recess 3 is not particularly limited as long as the head 10b can be inserted. However, since there are bolts having various sizes of heads in the conventional well-known bolts, It is preferable to have a size that can cope with the above.

  Further, as shown in FIGS. 1A and 1B and FIG. 2, the concave portion 3 has a second surface on the opposite side surface (opposing surface) where the contact surface 3a of the concave portion 3 is formed. A measurement scale 6 is formed. By providing the second measurement scale 6, when the bolt 10 is arranged as shown in FIG. 2, the diameter of the head 10b of the bolt 10 (S in the figure) can be measured.

  Further, as shown in FIGS. 1A and 1B and FIG. 2, a third measurement scale 5 is formed on the bottom 3 b of the recess 3. By providing the third measurement scale 5, the thickness (T in the figure) of the head 10b can be measured.

Further, as shown in FIGS. 1 (a) and 1 (b) and FIG. 2, the opposite side (hereinafter referred to as the facing portion 2b) across the recess 3 in the measurement unit 2 is the bottom 3b of the recess 3. distance H ₁ is configured such that the distance H ₂ or more in length from the measurement unit 2 to the bottom 3b of the recess 3. (That is, H ₁ ≧ H ₂ ). Thereby, when the impact from the external environment received by the bolt measuring instrument 1 is received, in particular, from the direction indicated by the arrow in FIG. 2, the boundary portion 4 can be protected by the facing portion 2b.

  By providing the configuration as described above, the bolt measuring instrument 1 can measure the length of the screw portion 10a, and when any impact is applied to the bolt measuring instrument 1 from the external environment during storage or transportation. Even if it exists, the influence which it has on the actual measurement of the length of the screw part 10a is remarkably low. Therefore, excellent durability can be obtained.

  Next, a method for measuring (actually measuring) the length of the screw portion 10a, the diameter of the screw portion 10a, the diameter of the head portion 10b, and the thickness of the head portion 10b using the bolt measuring instrument 1 will be described. . However, it is not limited to the following method.

  First, the bolt 10 is arranged on the bolt measuring instrument 1 such that the head 10 b of the bolt 10 is in contact with the contact surface 3 a and the screw portion 10 a is along the measuring unit 2. Thereby, while being able to measure the length of the screw part 10a, the use (reuse) limit of the volt | bolt 10 can be discriminate | determined.

  In addition, since the third measurement scale 5 is formed along the bottom 3b of the recess 3, the thickness of the head 10b can be measured simultaneously with the measurement of the length of the screw portion 10a.

  Subsequently, when the diameter of the head 10 b is actually measured, the head 10 b is arranged along the second measurement scale 6. Thereby, the diameter of the head 10b can be measured.

  Further, when actually measuring the diameter E (FIG. 2) of the screw portion 10a, the head portion 10b of the bolt 10 that has been arranged so that the lower surface 10c abuts against the abutment surface 3a is detached from the concave portion 3, and the second By arranging the measurement scale 6 so that the diameter of the screw portion 10a is along, the diameter of the screw portion 10a can be measured.

  As for the actual measurement of the diameter of the screw portion 10a, after the head 10b of the bolt 10 is detached from the recess 3, the radial direction of the screw portion 10a is arranged along the measurement portion 2, and the first measurement scale 2a is set. It is also possible to actually measure it.

  In this way, by using the bolt measuring instrument 1, the head 10 b of the bolt 10 is inserted into the recess 3, the screw portion 10 a is arranged along the measuring portion 2, and the first measurement scale 2 a is visually observed. The length of the screw portion 10a can be actually measured by a simple operation.

  Therefore, the use (reuse) limit of the screw portion 10a of the bolt 10 can be determined without requiring a complicated operation as in the prior art.

  Further, when the length of the screw portion 10 a is measured, the lower surface 10 c of the head portion 10 b of the bolt 10 comes into contact with the contact surface 3 a provided in the recess 3. As a result, some impact is applied to the bolt measuring instrument 1 from the external environment during storage and transportation, and even if the boundary portion 4 is slightly damaged, the impact does not reach the contact surface 3 a formed in the recess 3. And the contact surface 3a is not damaged. Therefore, even when the bolt measuring instrument 1 is actually used and stored or transported, the length of the screw portion 10a can always be accurately measured.

  Although the bolt measuring instrument 1 in the present embodiment has a plate-like structure, the present invention is not limited to this structure as described above. FIGS. 3A and 3B show the structure of another bolt measuring instrument. FIG. 3A is a perspective view showing a configuration of a bolt measuring instrument 1 ′ having a rectangular parallelepiped structure, and FIG. 3B is a perspective view showing a configuration of a bolt measuring instrument 1 ″ having a cylindrical structure.

  For example, as shown in FIG. 3A, when the bolt measuring instrument has a rectangular parallelepiped structure, the first measurement scale is formed on the plane (side surface) of the bolt measuring instrument 1 ′ as in FIG. 1A. However, it may be formed on the surface of the measurement unit 2 ′ like the first measurement scale 2a ′. Similarly, in the case of the bolt measuring instrument 1 ″, the first measurement scale may be formed on the surface of the measurement unit 2 ″ like the first measurement scale 2 a ″.

  Furthermore, when the bolt measuring instrument 1 has a rectangular parallelepiped structure or a cylindrical structure, the structure of the surface of the measuring unit 2 shown in FIG. 1C is not particularly limited. That is, the surface of the measuring unit 2 may be a flat plate as in the bolt measuring instrument 1 shown in FIGS. 1B and 1C, for example, along the shape of the screw part so that the screw part of the bolt can be easily arranged. It may be a curved structure.

  When the bolt measuring instrument has a rectangular parallelepiped structure or a cylindrical structure, the recess 3 may have a groove shape with respect to the bolt measuring instrument 1 ′ and the bolt measuring instrument 1 ″, or FIGS. 3 (a) and 3 (b). As shown, it may have a hole shape for the bolt measuring instrument 1 ′ and the bolt measuring instrument 1 ″.

  In the bolt measuring instrument 1 of the present embodiment, the third measurement scale 5 is formed on the bottom 3b of the recess 3 as shown in FIGS. 1 (a) and 1 (b) and FIG. However, as shown in FIGS. 3A and 3B, when the recess 3 has a hole shape for the bolt measuring instrument 1 ′ and the bolt measuring instrument 1 ″, the third measurement scale 5 is shown in FIG. ) / (B). Further, the second measurement scale 6 can also be provided at the locations shown in FIGS. 3A and 3B when the recess 3 has a hole shape for the bolt measuring instrument 1 ′ and the bolt measuring instrument 1 ″. .

  It should be noted that all scales including the first measurement scale 2a shown in FIGS. 1 (a) and 1 (b) and FIG. 2 show limit values so that the bolt use (reuse) limit can be easily identified. It is also possible to provide a mark.

  Further, in the present embodiment, the case where the bolt 10 having the screw portion 10a having the screw thread and the head portion 10b is used is described. However, the present invention is limited to the screw portion having the screw thread. For example, as shown in FIG. 6, it is also possible to use for a nail (bolt) 11 having a trunk portion 11a having no thread and a head portion 11b having a lower surface 11c. That is, the bolt measuring instrument according to the present invention can measure the length of the body 11a using the first measurement scale 2a even when the nail 11 shown in FIG. Reuse) limits can be determined.

  It should be noted that this embodiment is merely to clarify the technical contents of the present invention, and should not be interpreted in a narrow sense by limiting only to such specific examples. Within the scope, various changes can be made and implemented.

  The bolt measuring instrument according to the present invention is, for example, a bolt having a barrel, such as a bolt having a screw portion, a nail, a screw, and a screw nail, and a bolt provided with a head provided at one end of the barrel. The length, the diameter of the torso, the diameter of the head, the thickness of the head, etc. can be measured accurately and simply, and the durability is excellent. Accordingly, the use (reuse) limit of the bolt can be easily and accurately determined.

The structure of the bolt measuring device which concerns on one Embodiment of this invention is shown, (a) is a top view of a bolt measuring device, (b) is the said case at the time of seeing the bolt measuring device shown to (a) from the arrow A direction. It is a perspective view of a volt | bolt measuring device, (c) is a side view of the said volt | bolt measuring device at the time of seeing the volt | bolt measuring device shown to (a) from the arrow B direction. It is the top view of the bolt measuring device and the bolt which showed the state which has arrange | positioned the bolt to the said bolt measuring device with the structure of the bolt measuring device of this Embodiment shown to Fig.1 (a). The other structure of the bolt measuring device which concerns on one Embodiment of this invention shown to Fig.1 (a)-(c) is shown, (a) is the perspective view which showed the structure of the bolt measuring device of a rectangular parallelepiped structure. And (b) is a perspective view showing a configuration of a cylindrical bolt measuring instrument. It is a perspective view which shows the structure of the conventional thread part length gauge of a volt | bolt. It is a top view which shows the structure of the conventional internal method measurement ruler. It is the perspective view which showed the other structure of the volt | bolt which can apply the bolt measuring device which concerns on one Embodiment of this invention shown to Fig.1 (a)-(c).

Explanation of symbols

1, 1 ′, 1 ″ bolt measuring instrument 2, 2 ′, 2 ″ measuring section 2a first measurement scale 2b facing section 3 recess 3a contact surface 3b bottom section 4 boundary section 5 third measurement scale 6 second measurement scale 10 bolt 10a screw part (body part)
10b Head 10c Lower surface 11 Nail (bolt)
11a trunk 11b head 11c bottom

Claims (5)

A bolt measuring instrument for measuring the length of the torso of a bolt including a torso and a head provided at one end of the torso,
It is configured to be able to arrange the body part in a state along the central axis of the body part, and includes a measurement unit provided with a first measurement scale at least in part,
The bolt measuring instrument according to claim 1, wherein the measuring section is provided with a recess having an abutting surface configured to allow the lower surface of the head to abut against the head.   2. The bolt measuring instrument according to claim 1, wherein a second measurement scale for measuring at least a diameter of the head is formed on a surface of the concave portion facing the contact surface.   The bolt measuring instrument according to claim 1 or 2, wherein a third measurement scale for measuring at least the thickness of the head is formed at the bottom of the recess.   A first measurement scale is formed on the side of the measurement unit where the contact surface is formed as viewed from the recess, and the other side is more than the side on which the contact surface is formed. The bolt measuring instrument according to any one of claims 1 to 3, wherein the bolt measuring instrument is configured such that the height from the bottom of the recess is increased.   The bolt measuring instrument according to any one of claims 1 to 4, wherein the trunk portion is a screw portion having a thread.

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