JP2007152483A - Fastening state determination device for bolts - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening state determination device for bolts, preventing leakage of a marking liquid by improving the sealing function of the marking liquid in the secondary fastening when a bolt is determined to be fastened with a required torque or not from the adhering state of the marking liquid. <P>SOLUTION: This fastening state determination device for bolts includes: a marking member 11 formed of material having liquid impregnation property, the upper end of which is dipped in a marking liquid chamber, the lower end being abutted on the head of a bolt 3, and constructed so that the outer periphery of a seal part 11c is fitted to the inner periphery of a sealing member 15 supported on the lower part of a case to reciprocate; and a spring energized in the direction of pressing the marking member to the head of the bolt, wherein when the head of the bolt is rotated, the lower end part of the marking member is abutted on the head of the bolt, so that the marking liquid adheres to the head of the bolt through the seal part of the marking member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides a marking liquid supply device housed in a socket of a box wrench by secondary tightening of the box wrench after primary tightening such as temporary tightening of a bolt by a box wrench such as a torque wrench. The present invention relates to a bolt tightening state determination device that attaches marking liquid such as ink to a bolt head and determines whether the bolt tightening state is good or not according to the marking liquid attached to the bolt head.

One means for checking whether or not the bolt is tightened with a required tightening torque after the bolt is temporarily tightened with a torque wrench or after the bolt is fully tightened is the means shown in FIG. That is, FIGS. 5A, 5B, and 5C are explanatory views showing a conventional tightening state determination procedure for bolts.
In FIG. 5A, a felt material 4 is attached to the bottom of the tightening hole (bolt head engagement hole) 2a of the socket 2 of the torque wrench 1 and felt in the ink 102 accommodated in the container 101. The felt material 4 is impregnated with the ink 102 by immersing the material 4. Alternatively, the ink in the spray container 103 is sprayed on the felt material 4 to impregnate the ink 102.

Next, as shown in FIG. 5 (B), the socket 2 of the torque wrench 1 with the felt material 4 impregnated with the ink 102 is engaged with the head 3a of the bolt 3 after temporary tightening (or after final tightening), The torque wrench 1 is rotated to perform additional tightening (secondary tightening) of the bolt 3. Here, 3b is a thread portion of the bolt 3, and 3c is a collar portion.
After such additional tightening, the socket 2 of the torque wrench 1 is pulled out and the head 3a of the bolt 3 is inspected. As shown in FIG. 5C, the ink 102 adheres to the head 3a in a predetermined form. If so, it is determined that the bolt is tightened with the required tightening torque.

Further, in Patent Document 1 (Japanese Utility Model Publication No. 59-124073), after the bolt was temporarily tightened (primary tightening) with a torque wrench, it was fitted into the socket by secondary tightening of the torque wrench. A bolt tightening state determination device that attaches marking liquid from a marking liquid supply device to a bolt head and determines whether the bolt tightening state is good or not according to the state of marking liquid adhesion to the bolt head. The liquid supply device is provided with a holding ring slidably fitted in a cylindrical case and urged toward the opening at the bottom of the case. The holding ring is mainly made of a porous elastic body. There is disclosed a bolt tightening state determination device in which a marking head is mounted and an ink reservoir is provided on the back of the marking head.
Japanese Utility Model Publication No.59-124073

In the prior art shown in FIG. 5, the felt material 4 is adhered to the bottom of the tightening hole 2 a of the socket 2 of the torque wrench 1 and immersed in ink in the container 101 to impregnate the felt material 4 with ink. The socket 2 of the torque wrench 1 with the felt material 4 impregnated with the ink is engaged with the head 3a of the bolt 3 after temporary tightening, and additional tightening (secondary tightening) of the bolt 3 is performed. Since the head 3a of the bolt 3 is inspected after tightening and it is determined that the bolt is tightened with the required tightening torque when ink adheres to the head 3a in a predetermined form, Ink adhered to the entire head of the bolt and the periphery of the bolt tightening portion was contaminated. Further, ink must be replenished every time the bolt tightening torque is confirmed, and the amount of ink used increases.
In addition, since the ink has adhered to the entire head of the bolt after the secondary tightening, it cannot be accurately determined whether the tightening is performed with the required torque.
There are problems such as.

In the technique of Patent Document 1 (Japanese Utility Model Publication No. 59-124073), a marking head mainly composed of a porous elastic body is attached to a retaining ring, and the back of the marking head is impregnated with ink. Since the ink reservoir is installed, when the marking head is pressed against the head of the bolt at the second tightening of the torque wrench, the marking head and the ink seal on the ink reservoir side are not sufficiently sealed. Easy to leak around.
Further, since the ink reservoir constituting the marking member is impregnated with ink, when the ink runs out, the marking head must be replenished each time, and the work efficiency of the bolt tightening work is reduced.

  Accordingly, in view of the problems of the prior art, the present invention can accurately determine the presence or absence of tightening with the required torque of the bolt from the adhesion state of the marking liquid, reduce the amount of marking liquid used, and at the time of secondary tightening Provided is a bolt tightening state judging device that improves the marking liquid sealing function, avoids leakage of marking liquid and surrounding contamination, and can easily replenish the marking liquid to improve the workability of bolt tightening work. For the purpose.

The present invention achieves such an object. After the primary tightening of the bolt by the box wrench, the marking in the marking liquid supply device accommodated in the socket of the box wrench is performed by the second tightening of the box wrench. In a bolt tightening state determination device that attaches a liquid to the head of the bolt and determines whether the bolt is tightened according to the marking liquid attached to the head of the bolt.
The marking liquid supply device includes a marking liquid chamber that is formed in a cylindrical case and accommodates the marking liquid, and is composed of a material having a liquid impregnation property, and an upper end portion is immersed in the marking liquid chamber and a lower end portion is formed. A marking member that is capable of contacting the head portion of the bolt, and an outer periphery of the seal portion is fitted to an inner periphery of a seal member supported by a lower portion of the case so as to reciprocate and relatively rotate, and the marking A spring erected between the upper end of the member and the upper part of the case and biased in a direction to press the marking member against the head of the bolt; When the marking member is rotated, the lower end portion of the marking member is brought into contact with the head of the bolt, and the upper end portion of the marking member is immersed therein. King liquid is characterized in that it is configured to adhere to the head of the bolt through the seal portion of the marking device (claim 1).
In this invention, it is preferable that the marking member is formed of either a felt material or a hard sponge material (Claim 2).

In the invention, the marking member is preferably configured as follows.
(1) The seal portion of the marking member is formed in a circular cross section (Claim 3).
(2) The seal portion of the marking member is formed in a circular cross section, and a small passage for the marking liquid that connects the marking liquid chamber and the head side of the bolt is formed.
(3) The seal portion of the marking member is formed in a polygonal cross section (claim 5).

  In the present invention, the marking liquid supply device includes a spacer that can be inserted into an outer periphery of the case, and the marking liquid supply device can be attached to the inside of the socket of the box wrench via the spacer. (Claim 6).

  According to this invention, in the marking liquid supply device that attaches marking liquid such as ink to the head of the bolt at the time of the second tightening of the box wrench, the upper end is immersed in the marking liquid contained in the marking liquid chamber and the lower end Preferably, the felt part or the hard part is fitted to the head part of the bolt so that the outer periphery of the seal part is reciprocally movable and relatively rotatable on the inner periphery of the seal member supported by the lower part of the case. (Claim 2) A marking member made of a sponge material and a spring biased in a direction to press the marking member against the head of the bolt, and the bolt head via the socket of the box wrench When the mark member is rotated, the lower end portion of the marking member is brought into contact with the head of the bolt, and the upper end portion of the marking member is immersed. Since the marking liquid in the liquid chamber adheres to the head of the bolt through the seal portion of the marking member (Claim 1), the marking member upper part is always marked when the marking liquid is contained in the marking liquid chamber. Since it is immersed in the liquid, the marking liquid can penetrate into the marking member and can be surely and oozed out to the upper surface of the bolt head. The presence or absence of tightening with the required torque of the bolt with a box wrench can be accurately determined from the attached state.

In addition, since marking fluid such as ink oozes out from the marking member to the head of the bolt, the marking fluid is supplied only to the top surface of the bolt head, so that Scattering of the marking liquid and contamination around the bolt tightening portion can be avoided, and the quality of the bolt tightening body is improved.
Furthermore, the marking liquid such as ink penetrates the inside of the marking member made of a material having liquid impregnation property and oozes out to the top surface of the bolt head. Compared to technology, the amount of marking liquid used can be significantly reduced.

Further, the marking member is configured so that the outer periphery of the seal portion is fitted to the inner periphery of the seal member supported by the lower portion of the case of the marking liquid supply device so as to be reciprocally movable and relatively rotatable. Thus, it is possible to reliably seal between the marking liquid chamber side and the head side of the bolt, and to avoid leakage of the marking liquid from the marking liquid chamber side, compared with the prior art provided in Patent Document 1 The sealing performance of marking fluid is improved.
Furthermore, since the marking member contained in the marking solution chamber is soaked into the marking member, the marking member itself as in the prior art provided in Patent Document 1 is impregnated with the marking solution. As described above, it is not necessary to replenish the marking liquid every time the marking liquid runs out, and when the marking liquid runs out, the marking liquid chamber can be removed to easily replenish the marking liquid from the upper part of the marking liquid chamber, The workability of the bolt tightening work is improved.

In addition, if the seal portion of the marking member is formed in a circular cross section (Claim 3), the marking member can be easily processed and the manufacturing cost is reduced, and the circular cross section improves the sealing performance of the outer peripheral portion. .
Further, if the seal portion of the marking member is formed in a circular cross section and a small passage of the marking liquid is formed to communicate the marking liquid chamber and the head side of the bolt (Claim 4), the hardness of the marking member Even if the penetrating degree of the marking liquid in the marking member is reduced by increasing the durability by increasing the length of the marking member, it is possible to avoid the shortage of the marking liquid by passing an appropriate amount of the marking liquid through the small passage.
In addition, if the sealing portion of the marking member is formed in a polygonal cross section (Claim 5), the marking portion has a polygonal cross section, whereby the rigidity of the marking member is improved and the sides of the polygon and the seal are sealed. The marking liquid can be supplied through a gap with the inner periphery of the member.

  Further, according to the present invention, by providing a spacer that can be fitted on the outer periphery of the case of the marking liquid supply device, the marking liquid supply device can be attached to the inside of the socket of the box wrench via the spacer ( (6) Even if the diameter of the socket of the box wrench changes depending on the size of the bolt, the marking liquid supply device can be used in common by selecting a suitable spacer and incorporating it, thereby improving versatility.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 4 is a side view showing an example of a torque wrench applied to the present invention.
In FIG. 4, reference numeral 1 denotes a torque wrench, and a socket 2 is detachably attached to a tip portion. The socket 2 is formed in a cylindrical shape, and a connecting member 1a attached to the upper inner periphery 2b so as not to be relatively rotatable is engaged with a square hole (not shown) formed in the body 1b of the socket 2. . Then, the torque wrench 1 rotates its arm 1c, whereby the socket 2 rotates through the square hole of the body 1b and the connecting member 1a. As shown in FIG. A tightening torque is applied to the bolt 3 through an engaging portion 2a that is formed in the lower portion of the bolt 3 and engaged with the head 3a of the bolt 3.

1A and 1B show a bolt tightening state determination apparatus according to an embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view showing the overall structure of the apparatus, and FIG. 1B is a longitudinal sectional view of an ink cartridge.
In the figure, reference numeral 10 denotes an ink cartridge constituting a marking liquid supply device, which is detachably fitted to the inner periphery of the socket 2 (see FIG. 4).
In FIG. 1B showing the details of the ink cartridge 10, reference numeral 110 denotes a cylindrical case, and reference numeral 12 denotes an ink chamber formed in the case 110 and containing ink as a marking liquid. The ink chamber 12 has a cover 14 attached to the inner periphery of the upper portion and is covered with the cover 14, and a seal member 15 made of a material having flexibility and elasticity, such as a urethane material, is attached to the lower inner periphery. .

The seal member 15 is formed in a disk shape having a through hole 15a into which the marking member 11 is inserted at the center. The marking member 11 is preferably made of a material that is impregnated with a liquid (in this case, ink), such as a felt material or a hard sponge material, and a large-diameter upper end portion 11 a is immersed in the ink in the ink chamber 12. The small-diameter seal portion 11c is fitted in the through hole 15a of the seal member 15 so as to be reciprocally movable, and the hemispherical lower end portion 11b can be brought into contact with the upper surface 3s of the bolt head 3a.
Reference numeral 14 a denotes an ink injection cap that is detachably attached to the central portion of the lid 14. Reference numeral 13 denotes a spring having an upper end supported by the lower surface of the ink injection cap 14a and a lower end supported by a spring receiver 19 fixed to the upper portion of the marking member 11. The marking member 11 is attached to the bolt head 3a. It is biased in the direction of pressing against the upper surface 3s.

The cross-sectional shape of the seal portion 11c of the marking member 11 is preferably the following three shapes.
(1) As shown in FIG. 2A, the seal portion 11c is formed in a circular cross section.
If comprised in this way, since the marking member 11 is a cylindrical body, it will be easy to process and the manufacturing cost will be reduced, and since it has a circular cross section, the sealing performance of the outer periphery will be good.

(2) As shown in FIG. 2B, the seal portion 11c is formed in a circular cross section, and a small ink passage 11e is formed to communicate the inside of the ink chamber 12 and the head 3a side of the bolt.
According to this structure, even if the hardness of the marking member 11 is increased to increase the durability, the ink permeation through the small passage 11e is reduced by passing an appropriate amount of ink through the small passage 11e. (Marking fluid) Insufficient occurrence can be avoided.

(3) As shown in FIG. 2 (C), the seal portion 11c is formed in a polygonal cross section.
If comprised in this way, while making the seal | sticker part 11c into a polygonal cross section, while the rigidity of the marking member 11 improves, ink will be supplied through the clearance 11d between the side of this polygon and the inner periphery of the said seal member 15 it can.

In determining whether the bolt 3 is tightened or not using the bolt tightening state determination device having the above-described configuration, the torque wrench 1 performs primary tightening such as temporary tightening or final tightening, and then FIG. As shown in FIG. 1A, the ink cartridge 10 is inserted into the socket 2 by fitting the outer periphery of the case 110 into the inner periphery of the socket 2, and the ink cartridge 10 shown in FIGS. As shown, the ink cartridge 10 is fixed to the socket 2 via a snap ring 120.
Next, the ink injection cap 14 a is removed, and ink as a marking liquid is injected into the ink chamber 12. As a result, the ink penetrates into the marking member 11 from the upper end portion 11 a of the marking member 11 immersed in the ink chamber 12.

Next, the socket 2 is moved downward by the torque wrench 1 so that the engaging portion 2 a of the socket 2 is fitted to the head 3 a of the bolt 3. With the downward movement of the socket 2, the ink cartridge 10 is also moved downward, and the hemispherical lower end portion 11b of the marking member 11 contacts the upper surface 3s of the bolt head portion 3a.
Next, when the bolt 2 is tightened (finally tightened) by rotating the socket 2 by the torque wrench 1 and rotating the bolt head 3a, the inner periphery of the seal member 15 can be reciprocated and relatively rotated. The fitted marking member 11 is not rotated but is pressed against the upper surface 3s of the bolt head 3a by a pressing force due to the difference between the lower power of the socket 2 due to the tightening and the spring force of the spring 13. The ink soaked into the marking member 11 oozes out from the lower end portion 11b of the marking member 11 and adheres to the upper surface 3s of the head portion 3a.

When the tightening force by the additional tightening (final tightening) is sufficient and the necessary additional tightening (final tightening) is performed, a circular shape with the ink is applied to the upper surface 3s of the bolt head 3a as shown in FIG. A clear mark Z is attached. When the required additional tightening (final tightening) is not performed, the mark Z does not become a complete circle but a part of the mark Z is missing.
In this way, it is determined whether or not the required final tightening is performed based on the shape of the mark Z by ink after the additional tightening (final tightening).

  According to this embodiment, the upper end portion 11a is immersed in the ink accommodated in the ink chamber 12, the lower end portion 11b can be brought into contact with the upper surface 3s of the bolt head portion 3a, and the outer periphery of the seal portion 11c is the case. 110, a marking member 11 preferably made of a felt material or a hard sponge material fitted to the inner periphery of a seal member 15 supported at the lower portion of the seal member 15 so as to be reciprocally movable and relatively rotatable, and the marking member 11 as a head of the bolt. When the head 3a of the bolt 3 is rotated through the socket 2 of the torque wrench 1 with the spring 13 biased in the pressing direction against the 3a, the lower end portion 11b of the marking member 11 becomes the bolt head The ink in the ink chamber 12 in which the upper end portion 11a of the marking member 11 is immersed in contact with the upper surface 3s of 3a Since it is configured to adhere to the upper surface 3s of the head 3a of the bolt 3 through the portion 11c, when the ink is accommodated in the ink chamber 12, the upper portion of the marking member 11 is always immersed in the ink. Thus, the ink can penetrate into the marking member 11 and can be surely oozed out to the upper surface 3 s of the head 3 of the bolt 3. The presence or absence of tightening of the bolt 3 with the required torque by the wrench 1 can be accurately determined.

Further, since the ink oozes out from the marking member 11 to the upper surface 3s of the head of the bolt 3, the ink is supplied only to the upper surface 3s of the head of the bolt 3, and to the periphery of the bolt tightening portion. Ink splashing and contamination around the bolt tightening portion can be avoided, and the quality of the bolt tightening body is improved.
Further, since the ink penetrates the inside of the marking member 11 made of a liquid-impregnated material and oozes out to the top surface 3s of the head of the bolt 3, the ink is required to the minimum, and the conventional technology is used. In comparison, the amount of ink used can be significantly reduced.

In addition, the marking member 11 is configured to fit the outer periphery of the seal portion 11c to the inner periphery of the seal member 15 supported by the lower portion of the case 110 of the ink cartridge 10 so as to be reciprocally movable and relatively rotatable. The seal portion 11c can securely seal the space between the ink chamber 12 side and the head 3a side of the bolt 3 to avoid ink leakage from the ink chamber 12 side. Ink sealing performance is improved as compared with conventional techniques.
Further, since the marking member 11 is soaked with the ink stored in the ink chamber 12, the ink is impregnated as if the marking member 11 itself provided in Patent Document 1 is impregnated with ink. It is not necessary to replace the marking member 11 when the ink is lost. When the ink is used up, the ink injection cap 14a in the ink chamber 12 is removed, and the ink is easily and occasionally removed from the ink injection cap 14a in the upper portion of the ink chamber 12. This improves the workability of bolt tightening work.

Further, in another embodiment of the present invention, as shown in FIG. 1B, a spacer 20 that can be fitted to the outer periphery (outer diameter D) of the case 110 (thickness t) is provided, and the ink cartridge 10 is provided. Can be attached to the inside of the socket 2 of the torque wrench 1 via the spacer 20.
With this configuration, even if the diameter D1 of the socket 2 of the torque wrench 1 changes depending on the size of the bolt 3, the ink cartridge 10 can be shared by selecting and incorporating the spacer 20 having the outer diameter D1 that matches the diameter D1. Can be used, and versatility is improved.

  According to the present invention, it is possible to accurately determine the presence or absence of tightening with the required torque of the bolt from the adhesion state of the marking liquid, reduce the amount of marking liquid used, and improve the marking liquid sealing function during secondary tightening Thus, it is possible to provide a bolt tightening state determination device that avoids leakage of the marking liquid and surrounding contamination thereby, and can easily replenish the marking liquid to improve the workability of the bolt tightening operation.

FIG. 2 shows a bolt tightening state determination device according to an embodiment of the present invention, in which (A) is a longitudinal sectional view showing the overall structure of the device, and (B) is a longitudinal sectional view of an ink cartridge. (A), (B), (C) is the sectional view on the AA line in FIG. 1 (B) which shows three examples of the cross-sectional shape of the marking material in the said Example. It is a top view which shows the ink adhesion state after this clamping | tightening in the bolt head in the said Example. It is a side view which shows an example of the torque wrench applied to the said Example. (A), (B), (C) is explanatory drawing which shows the fastening state determination procedure of the conventional volt | bolts.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Torque wrench 2 Socket 3 Bolt 3a Bolt head 3s Upper surface of bolt head 10 Ink cartridge 11 Marking member 11a Upper end part 11b Lower end part 11c Seal part 11d Small passage 12 Ink chamber 13 Spring 14 Cover 14a Ink cap 15 Seal member 110 Case

Claims (6)

After the primary tightening of the bolt by the box wrench, the marking liquid in the marking liquid supply device housed in the socket of the box wrench is attached to the head of the bolt by the secondary tightening of the box wrench. In the tightening state determination device for bolts that determines the quality of the tightening state of the bolt based on the state of adhesion of the marking liquid to the head of the bolt,
The marking liquid supply device includes a marking liquid chamber that is formed in a cylindrical case and accommodates the marking liquid, and is composed of a material having a liquid impregnation property, and an upper end portion is immersed in the marking liquid chamber and a lower end portion is formed. A marking member that is capable of contacting the head portion of the bolt, and an outer periphery of the seal portion is fitted to an inner periphery of a seal member supported by a lower portion of the case so as to reciprocate and relatively rotate, and the marking A spring erected between the upper end of the member and the upper part of the case and biased in a direction to press the marking member against the head of the bolt; When the marking member is rotated, the lower end portion of the marking member is brought into contact with the head of the bolt, and the upper end portion of the marking member is immersed therein. King liquid tightened state determining apparatus for bolts, characterized in that it is configured to adhere to the head of the bolt through the seal portion of the marking member.   The bolt tightening state determination device according to claim 1, wherein the marking member is formed of either a felt material or a hard sponge material.   The bolt tightening state determination device according to claim 1, wherein the seal portion of the marking member is formed in a circular cross section.   2. The bolts according to claim 1, wherein the seal portion of the marking member is formed in a circular cross section and a small passage for the marking liquid that communicates the marking liquid chamber and the head side of the bolt is formed. Tightening state determination device.   The bolt tightening state determination device according to claim 1, wherein the seal portion of the marking member is formed in a polygonal cross section.   The marking liquid supply device includes a spacer that can be inserted into an outer periphery of the case, and the marking liquid supply device can be attached to the inside of the socket of the box wrench via the spacer. The bolt tightening state determination device according to claim 1.

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