socket

Abstract

This system allows for simultaneous tightening and marking of bolts and nuts with a simple configuration, while also improving the number of bolts and nuts that can be tightened relative to the amount of ink used. [Solution] A socket 10 that applies markings M1 and M2 simultaneously with tightening fastening members 3 and 4, wherein one end 10b of the cylindrical space of the socket body is a diameter portion 12 into which the fastening member is inserted and rotational force is transmitted, and the center 10c of the cylindrical space is a marking area for applying markings to the fastening member, and the marker portion 30 held in the cylindrical space has a first part 35 that is rotatable around the axis of the socket body, a second part 31 that engages with the first part and is able to move back and forth along the axial direction of the socket body and is biased toward the insertion side of the diameter portion, and stamp portions 38 and 39 of the marker portion that are provided furthest toward the insertion side of the diameter portion and are located on the axis of the socket body and in contact with the fastening member.

Description

Technical Field

[0001] The present invention relates to a socket that marks a fastening member while fastening the fastening member which is a bolt or a nut.

Background Art

[0002] In the tightening operation of high-strength bolts (nuts), it is required to uniformly introduce the designed tension by dividing it into preliminary tightening and final tightening. Therefore, in order to prevent on-site workers from skipping the preliminary tightening process or duplicating the final tightening process, after the preliminary tightening operation, it is obligatory to mark the bolt or nut to identify that the preliminary tightening has been completed. Such marking work can be done manually, but it is time-consuming at sites where a large number of bolts are used. Therefore, conventionally, a technique related to a torque wrench capable of continuously performing the bolt or nut tightening operation and the marking operation is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a conventional torque wrench with a marking means, when a predetermined tightening torque is reached during the preliminary tightening operation with the torque wrench, ink is applied to the same part in the circumferential direction of the bolt / nut. However, the marking means is configured to form an ink ejection port in the socket that receives the nut and inject ink with high-pressure gas from an ink tank attached to the socket, and the mechanism is extremely complicated. Also, considering the labor of the worker carrying the torque wrench, the capacity of the ink tank cannot be made very large.

[0005] This invention has been made in view of the above circumstances, and its purpose is to enable bolt and nut tightening and marking operations to be performed simultaneously with a simple configuration, and to improve the number of bolts and nuts that can be tightened relative to the amount of ink used. [Means for solving the problem]

[0006] The invention described in claim 1 is a socket that marks a fastening member at the same time as tightening the fastening member, It comprises a cylindrical socket body and a marker portion held within the cylindrical space of the socket body. One end of the cylindrical space is a diameter portion into which the fastening member is inserted and rotational force is transmitted, and the center of the cylindrical space is a marking area for marking the fastening member. The marker portion is, A first component is rotatably mounted around the axis of the socket body, A second component engages with the first component and is provided to be able to move back and forth along the axial direction of the socket body and is biased toward the insertion opening side of the diameter portion, The marker portion is characterized by having a stamp portion which is located on the insertion side of the diameter portion and on the axis of the socket body, and which contacts the fastening member when the fastening member is tightened.

[0007] The invention described in claim 2 is, in the socket described in claim 1, The second part is formed in an annular shape and has a circular hole, The first component is provided in the circular hole of the second component and, while engaged with the second component, is rotatably held by the second component around the axis of the socket body. The coefficient of friction of the stamp portion with respect to the fastening member is set to be higher than the coefficient of friction of the portion where the first part and the second part engage.

[0008] The invention described in claim 3 is, in the socket described in claim 2, The first component has a protrusion formed along the outer circumferential surface of the first component, The second part has a groove formed on the inner circumferential surface of the circular hole, The protrusion of the first component is provided within the groove of the second component.

[0009] The invention described in claim 4 is, in the socket described in claim 3, The present invention is characterized in that a plurality of hemispherical contact portions are fixed to at least one surface of the aforementioned protrusion.

[0010] The invention described in claim 5 is, in the socket described in claim 1, The portion where the first part and the second part engage is characterized by being coated with a material with a low coefficient of friction.

[0011] The invention described in claim 6 is, in the socket described in claim 1, The second component has a cylindrical insertion shaft portion that protrudes toward the first component and has a plurality of rollers arranged along its outer surface. The first component has a roughly cup-shaped storage section into which the insertion shaft portion is inserted and housed. The first component is held by the second component with the insertion shaft portion inserted into the storage portion, and the plurality of rollers on the insertion shaft portion are in contact with the inner surface of the storage portion in the first component.

[0012] The invention described in claim 7 is, in the socket described in claim 1, The first component is characterized in that it is provided with a stamp storage section located on the insertion side of the diameter portion of the first component, in which the stamp portion is housed.

[0013] The invention described in claim 8 is, in the socket described in claim 1, The first component is rotatably held around the axis of the socket body by the socket body, and the first component is formed in an annular shape and has a circular hole. The second component is provided in the circular hole of the first component and is held so as to be able to move forward and backward along the circular hole in a state of being engaged with the first component. The friction coefficient of the stamp portion with respect to the fastening member is set higher than the friction coefficient at the location where the first component and the socket body contact, which is characterized by this.

[0014] The invention according to claim 9 is the socket according to claim 8, The first component has a holding portion for holding the second component, a plurality of rotating end portions integrally formed on the outer peripheral edge portion of the holding portion and protruding outward, and a plurality of rolling elements held by each of the plurality of rotating end portions. The socket body is formed along the circumferential direction of the socket body and has a rotation groove in which the plurality of rolling elements in the first component are accommodated, which is characterized by this.

[0015] The invention according to claim 10 is the socket according to claim 8, The second component is provided on the side of the insertion port of the diameter portion closest to the second component and is provided with a stamp storage portion for storing the stamp portion, which is characterized by this.

[0016] The invention according to claim 11 is the socket according to any one of claims 1 to 10, The stamp portion has a first stamp portion having a protrusion at the center of the stamp surface that contacts the fastening member, and a second stamp portion having a flat stamp surface that contacts the fastening member, which is characterized by this.

[0017] The invention according to claim 12 is the socket according to claim 11, The paint used for the first stamp portion and the second stamp portion is set to different colors. [Effects of the Invention]

[0018] According to the present invention, it is possible to perform bolt and nut tightening and marking operations simultaneously with a simple configuration, and it is also possible to improve the number of bolts and nuts that can be tightened relative to the amount of ink used. [Brief explanation of the drawing]

[0019] [Figure 1] This is a perspective view showing the process of tightening bolts and nuts. [Figure 2] This is a top-down perspective view showing the socket. [Figure 3] This is a downward perspective view showing the socket. [Figure 4] This is a plan view showing a socket. [Figure 5] This is a front view showing the socket. [Figure 6] A bottom view showing the socket. [Figure 7] This is a cross-sectional view along line AA in Figure 5. [Figure 8] Figure 5 is a cross-sectional view along line BB. [Figure 9] This diagram illustrates the state before attaching a socket to a nut runner, tightening the nut, and marking the nut. [Figure 10] This diagram illustrates a method of attaching a socket to a nut runner, tightening a nut, and marking it. [Figure 11] This diagram shows the marking status after the initial tightening process has been completed. [Figure 12] This diagram shows the marking status after the final tightening process has been completed. [Figure 13] This is a simplified cross-sectional view showing a modified example of the marking mechanism. [Figure 14] This is a simplified cross-sectional view showing a modified example of the marking mechanism. [Figure 15] This is a simplified cross-sectional view showing a modified example of a socket. [Modes for carrying out the invention]

[0020] Embodiments of the present invention will be described below with reference to the drawings. However, while the embodiments described below are subject to various technically preferred limitations for carrying out the present invention, the technical scope of the present invention is not limited to the embodiments and illustrated examples below. In particular, although this embodiment is described with reference to bridge construction, it is not limited thereto and is applicable to other steel frame construction and all construction work in which bolt and nut (fastening member) tightening work occurs. Furthermore, the directions in the embodiments and illustrated examples below are set solely for the convenience of explanation.

[0021] In Figure 1, reference numeral 1 indicates a girder member for a bridge deck. This girder member 1 is a steel member with a cross-section of type I, consisting of a web 1a and upper and lower flanges 1b. The girder members 1 are connected to each other in the longitudinal direction to form a single long bridge deck. At the joint where the longitudinal ends of the girder members 1 meet, bolts 3 and nuts 4 are tightened via splice plates 2.

[0022] In this embodiment, the splice plate 2 is positioned across the two sides of the web 1a of the girder members 1 that are connected to each other. The splice plate 2 is a rectangular steel plate, and multiple through holes are formed in the splice plate 2 through which the shafts of the bolts 3 pass. Multiple through-holes are arranged in a grid pattern vertically and horizontally along the edges of the splice plate 2. Furthermore, these multiple through-holes are formed so that the spacing between them is equal both vertically (here referring to the up and down direction, but may also be vertical depending on the angle of the bridge girder, which is the connecting structure) and horizontally (here referring to the direction along the length of the bridge girder, but may also be horizontal depending on the angle of the bridge girder, which is the connecting structure). Consequently, the multiple bolts 3 (group of bolts) and nuts 4 (group of nuts) whose shafts pass through these multiple through-holes are also arranged in a grid pattern with equal spacing in the vertical and horizontal directions.

[0023] In the example shown in Figure 1, the nuts 4 are visible on one side (the side closest to the viewer) of the web 1a of both beam members 1. Therefore, the head of the bolt 3 is located on the other side of the web 1a, and the tip of the shaft of the bolt 3 is located on the one side of the web 1a. The tip of the shaft of the bolt 3 is exposed through the hole in the nut 4. Furthermore, both the bolt 3 and the nut 4 are used with washers 5. That is, washers 5 are placed on the surface of the splice plate 2, and the head of the bolt 3 and the nut 4 are positioned with the washers 5 in between. The number of washers 5 used may be one or two.

[0024] The bolt 3 in this embodiment is a so-called hemispherical head high-strength bolt (high-strength bolt), and consists of a head (not shown) which is formed in a hemispherical shape and into contact with the socket 10, and a shaft portion which protrudes from the center of the head, has threads formed on its surface, and does not have a pin tail at the tip in the protruding direction. The head comprises a vertex located at the center of the head, a base located opposite the vertex, and a curved surface extending from the vertex to the base. The base has a bottom surface integrally formed with the base end of the shaft, and an outer peripheral surface that intersects the bottom surface and is integrally formed with the curved surface. The outer peripheral surface has multiple sets of parallel pairs of jig contact surfaces. In this embodiment, three sets of pairs of jig contact surfaces are formed to form a hexagon.

[0025] Nut 4 is designed to correspond to bolt 3, which is a high-strength bolt, and is taller than the height of the bolt head 3. In this embodiment, three sets of parallel jig contact surfaces are formed to form a hexagon.

[0026] The nut runner 6, which performs the tightening of bolts 3 and nuts 4, is an electric power tool that operates on power supplied from a power source (not shown), and has a square drive 7 formed in the shape of a rectangular prism at its tip. A socket 10 for tightening nuts 4 (or the head of bolts 3) is detachably attached to the square drive 7. The square drive 7 has a first pin hole 7a that penetrates the square drive 7 in a direction perpendicular to the axial direction of the rotation axis.

[0027] The nut runner 6 has a drive unit that rotates the square drive 7, and the drive unit can switch the rotation direction of the square drive 7 between right rotation (clockwise) and left rotation (counterclockwise). In addition, the nut runner 6 has a function that automatically stops rotation when the set torque is reached. Therefore, the set torque can be changed for the initial tightening work and the final tightening work. Furthermore, the nut runner 6 has a reaction force receiver 8 for obtaining reaction forces from the head or nut 4 of the adjacent bolt 3 or other adjacent members.

[0028] To tighten the head of bolt 3 or nut 4, insert the bolt head 3 or nut 4 into the socket 10 and rotate the square drive 7 clockwise. When the set torque is reached, the rotation will automatically stop, completing the tightening of one bolt 3 or nut 4.

[0029] Socket 10 is a socket with a marking function that simultaneously tightens the fastening member (the head of the bolt 3 or the nut 4) and marks the fastening member. Furthermore, the marking can be used for both the initial tightening and final tightening of the fastening member by switching between two stamp parts 38 and 39, which are sufficiently soaked with ink as paint. Such a socket 10 incorporates a marker portion 30, which is mainly made of non-steel material. In contrast, the socket body, which holds the marker portion 30, is made of steel because it is used for tightening steel fastening members. As shown in Figures 2 to 8, the socket body is formed in a substantially cylindrical shape, with a socket hole 11 at the upper end into which a square drive 7 is inserted, and a bore portion 12 at the lower end into which the head of a bolt 3 or a nut 4 is inserted.

[0030] The socket socket 11 has a square hole that corresponds to the square drive 7, which is formed in a square prism shape. On one side (or two parallel sides) of the socket socket 11, which is a square hole, a second pin hole 11a is formed that corresponds to the first pin hole 7a formed in the square drive 7. The second pin hole 11a is formed by penetrating the outer wall of the socket 10. A single socket pin SP is inserted through the first pin hole 7a and the second pin hole 11a, thereby attaching the socket 10 to the nut runner 6.

[0031] The opening 12 is a rectangular hole that corresponds to the shape of the head of the bolt 3 or the nut 4 into which it is inserted. Since the nut 4 in this embodiment is hexagonal, the opening 12 is also roughly hexagonal. More specifically, of the six corners in the hexagonal hole of the diameter portion 12 (lower section 10b), three corners, skipping one, have a semi-circular sliding groove 21, which will be described later, and the other three corners, skipping one, have an angle of exactly 120°.

[0032] The socket 10 is formed to extend from the upper end to the lower end and has a hollow cylindrical shape. Therefore, the drive square 11 and the opening portion 12 are in communication as the internal space of the socket 10. The internal space of the socket 10 is roughly divided into three sections, upper and lower, as shown in Figure 7. The upper section 10a of the internal space is the drive angle 11 as described above, and the lower section 10b is the opening 12 as described above. The central section 10c of the internal space is the marking area for the operation of the marking mechanism 20 located in the internal space. The marking mechanism 20 includes a marker section 30 and a structure formed in the socket body for operating the marker section 30.

[0033] The lower section 10b, which is the diameter portion 12, is roughly a hexagonal hole as described above. In contrast, the central section 10c is roughly a circular hole, as shown in Figures 6 and 8. To explain in more detail, the central section 10c also has three semi-circular sliding grooves 21 that are continuous with the lower section 10b, and there are arc-shaped sides between the three sliding grooves.

[0034] Furthermore, the slide groove 21 is integrated and therefore common to both the lower section 10b and the central section 10c, but the hole diameter of the lower section 10b is set wider than that of the central section 10c due to the presence of the other three corners. As a result, a downward-facing contact surface 13 is formed at the boundary between the lower section 10b and the central section 10c. Consequently, when the head of the bolt 3 or the nut 4 is inserted into the opening 12 and fully accommodated, the corners contact the contact surface 13, preventing it from entering the central section 10c and keeping it within the lower section 10b (opening 12). Therefore, the head of the bolt 3 or the nut 4 does not penetrate too deep into the cylindrical space of the socket 10, making it possible to perform the tightening operation at the appropriate position within the cylindrical space.

[0035] Furthermore, the central section 10c has a wider hole diameter than the upper section 10a. As a result, a downward-facing bottom surface 14 is formed at the boundary between the central section 10c and the upper section 10a. In other words, the area from the contact surface 13 to the bottom surface 14 is the central section 10c, which is the region in which the marking mechanism 20 operates.

[0036] The outer casing of the socket 10 is formed so that there is no significant difference in diameter from the upper end to the lower end. However, the opening portion 12 (lower section 10b) has the widest diameter and is also the part that contacts the head of the bolt 3 or the nut 4, so its outer diameter is set to be slightly longer than other parts. In other words, the socket 10 is slightly thicker at the lower end than at the upper end. This ensures sufficient wall thickness for the opening portion 12. Hereinafter, the thickened portion around the opening portion 12 on the outer casing of the socket 10 will be referred to as the bulge portion 15.

[0037] Three through holes 22 are formed in the bulging portion 15, spaced apart in the circumferential direction. These through holes 22 are screw holes and penetrate the outer wall of the socket 10. The positions where the through holes 22 are formed correspond to the positions of the slide grooves 21. That is, the screws (stoppers 23, described later) provided in the through holes 22 are positioned so that their tips protrude into the slide grooves 21.

[0038] The upper and lower ends of the socket 10 are chamfered or filleted to make it easier for workers to handle the socket 10. Similarly, the upper end of the bulging portion 15 is also chamfered or filleted. Furthermore, the upper end surface of the socket 10 has a drive angle 11 located in the center, and the area around the drive angle 11 is an annular surface 16. In a plan view (Figure 4), the drive angle 11 is inscribed within the inner circumference of the annular surface 16, and the space between the annular surface 16 and the drive opening of the drive angle 11 is a roughly semicircular inclined surface 17. There are four inclined surfaces 17, corresponding to the four sides of the drive angle 11, and each of them slopes downward toward the drive angle 11. Therefore, when inserting the corner drive 7 of the nut runner 6, these inclined surfaces 17 function as guide surfaces for the corner drive 7.

[0039] Furthermore, a groove 17 is formed along the circumferential direction at the upper end of the outer casing of the socket 10. The second pin hole 11a of the drive square 11 is formed to penetrate from one side of the drive square 11 to the groove 17. That is, the socket pin SP is inserted into the second pin hole 11a from the groove 17 side, and then inserted into the first pin hole 7a of the corner drive 7 of the nut runner 6 which is inserted into the drive square 11. An O-ring 19 is fitted into the groove 17 to prevent the socket pin SP from coming out. The second pin hole 11a may also be formed on two parallel sides of the socket corner 11. In that case, two ends of the second pin hole 11a will be formed in the groove 17.

[0040] Next, the marking mechanism 20 will be described.

[0041] The marking mechanism 20 is a means for applying markings M1 and M2 to the head of the bolt 3 or the nut 4, as shown in Figures 9 to 12. Marking M1 is applied when the initial tightening work is completed, and marking M2 is applied when the final tightening work is completed. In this embodiment, since the nut runner 6 is used to tighten the nut 4, the marking mechanism 20 applies the marking to the tip surface 3a of the shaft portion of the bolt 3.

[0042] The socket 10 has an internal cylindrical space where the marking mechanism 20 is located. More specifically, the marking mechanism 20 includes a marker section 30 for applying markings M1 and M2 to the head of the bolt 3 or the nut 4, and a biasing section 40. The marker section 30 is configured to slide from the lower section 10b to the central section 10c. Therefore, a sliding groove 21 is formed in the internal cylindrical space of the socket 10 as described above. The slide groove 21 is formed from the insertion opening of the diameter portion 12 to the bottom surface 14 of the central section 10c. Furthermore, the slide grooves 21 are provided at three corners of the roughly hexagonal opening 12, with one corner skipped between each corner. In other words, when viewed from the bottom, the three-pronged hole and the hexagonal hole (opening 12) are integrated to form the lower section 10b, the three-pronged hole and the circular hole are integrated to form the central section 10c, and furthermore, the lower section 10b and the central section 10c are integrated. When the socket 10 is viewed from the bottom, the upper section 10a with the drive angle 11 is visible beyond the central section 10c.

[0043] As shown in Figures 6 and 8, the slide groove 21 is formed in a semi-circular shape with the curved portion facing outwards. In other words, the portion located outside the hexagonal hole in the lower section 10b and the portion located outside the circular hole in the central section 10c are formed in a semi-circular shape, and their protruding ends are rounded.

[0044] Furthermore, a retaining hole 41 is formed at the bottom of the slide groove 21 into which the upper end of the coil spring constituting the biasing portion 40 is inserted.

[0045] The through hole 22 is located near the upper end of the lower section 10b of the slide groove 21. A stopper 23 is inserted into the through hole 22 to prevent the marker section 30 from coming out of the bore section 12 after it has been inserted into the cylindrical space from the bore section 12. The tip of the stopper 23 is positioned so that it protrudes into the slide groove 21. Therefore, the marker section 30 is normally positioned on the central section 10c side of the stopper 23.

[0046] In this embodiment, the stopper 23 is a screw, and the through hole 22 is a screw hole. Therefore, the stopper 23 can be attached to the outer wall of the socket 10 by screwing it into the through hole 22 from the outside. The screw constituting the stopper 23 may be a regular screw with threads formed along its entire shaft, or it may be a screw with a smooth surface in the portion that is positioned within the slide groove 21. Furthermore, although a screw is used as the stopper 23 in this embodiment, it is not limited to this, and a pin (non-screwed) that can be inserted from the outside may also be used. In the case of a pin, it is preferable to use one that has a flange with a diameter wider than the diameter of the through hole 22 to prevent the pin from falling into the slide groove 21. Also, similar to the socket pin SP described above, it is preferable to use a structure in which the pin, which is the stopper 23, is held in place from the outside by an O-ring or the like (a set of groove 18 and O-ring 19).

[0047] The marker portion 30 is biased toward the insertion opening of the diameter portion 12 by a biasing portion 40 provided in the central section 10c. The biasing section 40 consists of multiple (three) coil springs 40, each set to a size (diameter) that fits into the slide groove 21. The upper end of the coil spring 40 is inserted into the retaining hole 24 located at the bottom of the slide groove 21, as described above. The lower end of the coil spring 40 is in contact with the marker portion 30. Multiple (3) retaining protrusions 42, which are inserted inside the coil spring 40, are integrally formed on the upper end surface of the marker portion 30. These multiple retaining protrusions 42 are positioned within the slide groove 21. As a result, the multiple coil springs 40, which constitute the biasing portion 40, are reliably positioned within the slide groove 21. Furthermore, since the slide groove 21 is positioned to correspond to three corners of the hexagonal hole, which constitutes the bore portion 12, with one corner skipped between each, it is well-balanced. Therefore, the marker portion 30 can be smoothly slid along the internal space of the cylinder.

[0048] As shown in Figures 9 to 12, the marker section 30 includes a sliding body 31 (i.e., a second part) that is biased toward the insertion opening of the bore section 12 by a biasing section 40 and slides along the slide groove 21 in the internal space of the cylinder, a held part 35 (i.e., a first part) that is rotatably held by the sliding body 31 around the axis of the socket 10, and stamp sections 38 and 39.

[0049] The sliding body 31 comprises a holding portion 32 that holds the held portion 35, and a slider portion 33 that is integrally formed on the outer peripheral edge of the holding portion 32 and inserted into three slide grooves 21.

[0050] The holding portion 32 is inserted through the opening of the diameter portion 12 and slides within the cylindrical space including the central compartment 10c; therefore, its diameter is set to be slightly smaller than the circular hole of the central compartment 10c. Also, since the part to be held 35 is held in the center of the holding portion 32, the holding portion 32 is formed in an annular shape.

[0051] Since the slider portion 33 is inserted into the three slide grooves 21, it is positioned at a 120° angle to each other when viewed from their centerlines. Furthermore, the slider portion 33 is formed to protrude laterally from the outer circumferential surface of the holding portion 33, and a recess 33a is formed at its protruding end, which is open downward and in the protruding direction. The recess 33a is the position into which the tip of the stopper 23 fits. Since the entire slide moving body 31, including the recess 33a, is biased toward the diameter portion 12 by the biasing portion 40, the tip of the stopper 23 that has entered the recess 33a contacts the contact portion 33b located above the recess 33a in the slider portion 33, thereby stopping the entire slide moving body 31 by the stopper 23.

[0052] The retained portion 35 is rotatably held around the axis of the socket 10 by the retaining portion 32 of the sliding body 31. Various retaining mechanisms can be used, but in this embodiment, a concave-concave fitting structure is employed. More specifically, the holding portion 32 of the sliding body 31 is formed in an annular shape as described above and has a circular hole, with a recessed groove 32a formed on the inner circumferential surface of the circular hole. On the other hand, the retained portion 35 is positioned on the annular portion of the annular retaining portion 32, and a protrusion 35a is formed along its outer circumferential surface. The protrusion 35a of the retained portion 35 is formed without interruption in the circumferential direction of the retained portion 35. The retained portion 35 is positioned such that the protrusion 35a of the retained portion 35 fits into the groove 32a of the retaining portion 32. Furthermore, a small gap is formed between the groove 32a and the protrusion 35a, so the retained portion 35 is not fixed to the retaining portion 32, but is in a slidable state. As a result, the retained portion 35 operates to rotate smoothly around the axis of the socket 10 (retaining portion 32) relative to the retaining portion 32.

[0053] Furthermore, the sliding body 31 and the held portion 35 are made of a resin material with a low coefficient of friction, such as ultra-high molecular weight polyethylene (UHMWPE) or PTFE resin (polytetrafluoroethylene: fluororesin). Alternatively, nylon, POM (polyoxymethylene), PET (polyethylene terephthalate), PEEK (polyether ether ketone), etc. may be used to provide not only a low coefficient of friction but also strength and wear resistance. The gap between the groove 32a and the ridge 35a may be further filled with a lubricant such as grease or lubricating oil. In other words, there may be a lubricating layer (lubricant layer) in the gap between the groove 32a and the ridge 35a. Alternatively, the contact points between the sliding body 31 and the held portion 35 may be treated with a surface treatment to reduce the coefficient of friction. In short, the surfaces may be polished to make them smooth and slippery.

[0054] With the holding mechanism described above, the part to be held 35 is rotatably held around the axis of the socket 10. However, the holding mechanism for holding the part to be held 35 is not limited to this and can be modified as appropriate without departing from the spirit of the present invention. Examples of other holding mechanisms will be described later as modifications.

[0055] The holding portion 35 includes a stamp storage portion 35b in which the portions of the stamp portions 38 and 39, excluding the ends on the stamp surface 38a and 39a side, are stored. The stamp storage section 35b is a recess formed on the lower center of the holding section 35, and is capable of holding the stamp sections 38 and 39. Although not shown in the figures, projections, ribs, etc., for holding the stamp sections 38 and 39 are appropriately formed on the side or bottom (upper) surface (upper surface) of the stamp storage section 35b.

[0056] As shown in Figures 11 and 12, the stamping sections 38 and 39 consist of a first stamping section 38 for the initial tightening operation and a second stamping section 39 for the final tightening operation. The first stamp portion 38 for the initial tightening operation has a projection in the center of the stamp surface 38a so that the area of ​​the marking M1 on the tip surface 3a of the shaft portion of the bolt 3 is reduced. In other words, only the projection on the stamp surface 38a contacts the tip surface 3a of the shaft portion of the bolt 3. The second stamp portion 39 for the final tightening operation has a flat stamp surface 39a so that the area of ​​the marking M2 on the tip surface 3a of the shaft portion of the bolt 3 is increased. In other words, the entire stamp surface 39a is in contact with the tip surface 3a of the shaft portion of the bolt 3.

[0057] The paints used in the first stamp section 38 and the second stamp section 39 are made of ink materials that do not mix with each other. Furthermore, the ink color of the first stamp section 38 for the initial tightening operation and the ink color of the second stamp section 39 for the final tightening operation may be different or the same.

[0058] The first stamp section 38 and the second stamp section 39 are made of a fibrous material such as felt that absorbs and fills with ink. Therefore, they can be easily replaced by pinching them with the fingers of a worker. The amount of ink filled is set to be sufficient to mark at least 800 to 1000 bolts 3 per stamp section 38, 39. The first stamp portion 38 and the second stamp portion 39 are detachable from the holding portion 35, and when the amount of ink becomes low, they are replaced with new first stamp portion 38 and second stamp portion 39. Alternatively, the ink may be refilled. For the purpose of refilling the ink, an ink injection hole may be provided on the upper surface of the holding portion 35.

[0059] The coefficient of friction at the stamp surfaces (contact surfaces) 38a and 39a of the first stamp portion 38 and the second stamp portion 39, which are in contact with the tip surface 3a of the shaft portion of the bolt 3, is set higher than the coefficient of friction at the part that contacts the holding portion 32 when the held portion 35 rotates. In other words, as described above, the held portion 35 is provided such that the protrusions 35a of the held portion 35 fit into the grooves 32a of the holding portion 32. Therefore, the protrusions 35a come into contact with the surface that makes up the groove 32a. However, as described above, the sliding body 31 and the held portion 35 are made of slippery material, and moreover, lubricant is filled in the contact area, so the coefficient of friction at the contact area between the protrusions 35a and the groove 32a is set to be extremely low. In contrast, the first stamp portion 38 and the second stamp portion 39 are made of fibrous material and are filled with ink (paint). Therefore, they come into contact with the tip surface 3a of the shaft portion of the bolt 3 with a certain degree of viscosity (stickiness). As a result, the coefficient of friction when the first stamp portion 38 and the second stamp portion 39 are in contact with the tip surface 3a of the shaft portion of the bolt 3 is higher than the coefficient of friction at the contact point between the convex ridge 35a and the concave groove 32a.

[0060] With the friction coefficient set as described above, simply by performing the tightening operation of the nut 4 with the nut runner 6 as usual, markings M1 and M2 can be applied to the tip surface 3a of the shaft portion of the bolt 3 while the nut 4 is being tightened. To explain in more detail, as shown in Figures 9 and 10, the nut 4 is inserted through the opening of the diameter portion 12, while the stamp surface 39a of the stamp portion 39 is brought into contact with the tip surface 3a of the shaft portion of the bolt 3. When the nut 4 is inserted until it contacts the contact surface 13 at the back of the diameter portion 12, the sliding body 31 is pushed into the central compartment 10c. However, because it is biased toward the opening of the diameter portion 12 by the biasing portion 40, the stamp portion 39 is strongly pressed against the tip surface 3a of the shaft portion of the bolt 3. In this state, when the square drive 7 of the nut runner 6 is rotated, the socket 10 and nut 4 also rotate (tighten) in conjunction with the rotation of the square drive 7. However, the shaft of the bolt 3, the stamp portion 39 pressed against the tip surface 3a of the shaft of the bolt 3, and the held portion 35 that holds the stamp portion 39 remain stationary and do not rotate in sync with the rotation of the square drive 7. In short, it becomes possible to tighten the nut 4 while marking it with the stamp portion 39 (38) and marking it with M2 (M1).

[0061] Figure 11 shows the state of the marking M1, which indicates that the initial tightening work has been completed, applied to the tip surface 3a of the shaft portion of the bolt 3 by the first stamp portion 38 for the initial tightening work. As described above, the first stamp portion 38 has a projection in the center of the stamp surface 38a, which reduces the area of ​​the marking M1. A worker who sees this marking M1 can immediately determine that the initial tightening work of the bolt 3 and nut 4 has been completed.

[0062] Figure 12 shows the state of the marking M2 that indicates the completion of the final tightening work, which is applied to the tip surface 3a of the shaft portion of the bolt 3 by the second stamp portion 39 used for the final tightening work performed after the initial tightening work is completed. As described above, the stamp surface 39a of the second stamp portion 39 is formed flat, and the area of ​​the marking M2 is increased. A worker who sees this marking M2 can immediately determine that the initial tightening work of the bolt 3 and nut 4 has been completed.

[0063] Furthermore, the paints used in the first stamp section 38 and the second stamp section 39 are made of ink materials that do not mix with each other, and may be different colors or the same color. Therefore, if the paint used in the second stamp section 39 is less concentrated and a different color than the paint used in the first stamp section 38, the markings M1 and M2 may appear to overlap after the initial tightening and final tightening are completed. In other words, the larger marking M2 is applied over the smaller marking M1, resulting in a faint appearance in the center of the marking M2. This allows for a quick determination that the final tightening has been completed after the initial tightening.

[0064] According to this embodiment, the marker portion 30 held in the cylindrical space of the socket 10 has a held portion 35 that is rotatable around the axis of the socket 10, a sliding body 31 that engages with the held portion 35 and is provided to be able to move back and forth along the axial direction of the socket 10 and is biased toward the insertion opening side of the diameter portion 12, and stamp portions 38, 39 that are provided on the insertion opening side of the diameter portion 12 of the marker portion 30 and are located on the axis of the socket 10 and contact the tip surface 3a of the shaft portion of the bolt 3 when the nut 4 is tightened. As a result, it is possible to perform the tightening work of the bolt 3 and nut 4 and the marking work simultaneously with a simple configuration, and the number of bolts 3 and nuts 4 that can be tightened relative to the amount of ink used can be improved. In other words, as in the conventional method, it is not necessary to attach a high-pressure gas-filled ink tank to the socket 10 and to form an ink discharge port on the socket 10. As a result, the marking mechanism provided on the socket 10 can be made simpler. Furthermore, since markings M1 and M2 can be applied simply by bringing the stamp part into contact with the fastening member, productivity is higher and more efficient in relation to the amount of ink that can be carried compared to using an ink tank filled with high-pressure gas. In other words, it is possible to increase the number of bolts 3 and nuts 4 that can be tightened in relation to the amount of ink used.

[0065] [Variation] The embodiments to which the present invention can be applied are not limited to those described above, and can be modified as appropriate without departing from the spirit of the invention. Modifications are described below. The following modifications may be combined as much as possible. Furthermore, in each of the following modifications, elements common to the above-described embodiments are denoted by the same reference numerals, and their descriptions are omitted or simplified.

[0066] [Variation 1] In the marker section 30 of the above embodiment, a concave-concave fitting structure is employed as a holding mechanism in which the held portion 35 is rotatably held around the axis of the socket 10 by the holding portion 32 of the sliding body 31. In the marker section 130 of this modified example, as shown in Figure 13, a concave-concave fitting structure is also employed between the holding portion 132 of the sliding body 131 (i.e., the second part) and the held portion 135 (i.e., the first part) held by this holding portion 132.

[0067] In this modified example, the retaining portion 132 is formed in an annular shape, and a groove 132a is formed on the inner circumferential surface of the annulus. Furthermore, the upper surface of the groove 132a is coated with a coating portion 132b, such as a fluorine coating, resulting in an extremely low coefficient of friction. The coating 132b is also formed in an annular shape. Similar to the embodiment described above, three slider portions 33 are integrally formed on the outer peripheral edge of the holding portion 132.

[0068] The retained portion 135 is positioned in the annular portion of the annular retaining portion 132, and a flange portion 135a is formed along its outer circumferential surface. The flange portion 135a is formed seamlessly in the circumferential direction of the retained portion 135.

[0069] Furthermore, the flange portion 135a is formed to be thin, with a thickness shorter than the vertical distance in the groove 132a of the holding portion 132, and a plurality of hemispherical contact portions 136 are arranged in a row on its upper surface. In other words, the plurality of hemispherical contact portions 136 are arranged in a ring shape around the held portion 135.

[0070] The multiple hemispherical contact portions 136 are coated with a fluorine coating or the like, similar to the coating portion 132b of the groove 132a. Furthermore, only the vertices of the multiple hemispherical contact portions 136 are in contact with the coating portion 132b of the groove 132a in the holding portion 132.

[0071] It should be noted that the hemispherical contact portion 136 is a hemisphere and not a sphere (ball), so it does not roll around but is fixed to the upper surface of the flange portion 135a.

[0072] Furthermore, the coefficient of friction at the stamp surfaces (contact surfaces) 38a and 39a of the first stamp portion 38 and the second stamp portion 39, which are in contact with the tip surface 3a of the shaft portion of the bolt 3, is set to be higher than the coefficient of friction when the multiple hemispherical contact portions 136 are in contact with the coating portion 132b of the groove 132a.

[0073] With the friction coefficient set as described above, simply by performing the tightening operation of the nut 4 with the nut runner 6 as usual, markings M1 and M2 can be applied to the tip surface 3a of the shaft portion of the bolt 3 while the nut 4 is being tightened.

[0074] Although not shown in the figures, the multiple hemispherical contact portions 136 may be provided not only on the upper surface of the flange portion 135a but also on the lower surface. In that case, the coating portion 132b may be provided not only on the upper surface of the groove 132a but also on the lower surface of the groove 132a.

[0075] According to this modified example, it becomes possible to perform the tightening of bolts 3 and nuts 4 and the marking work simultaneously with a simple configuration, and it is also possible to improve the number of bolts 3 and nuts 4 that can be tightened relative to the amount of ink used.

[0076] [Variation 2] As shown in Figure 14, the marker portion 230 of this modified example comprises a sliding body 231 (i.e., a second component) that is biased toward the insertion opening of the diameter portion 12 by the biasing portion 40 and slides along the slide groove 21 within the cylindrical space, a held portion 235 (i.e., a first component) that is rotatably held around the axis of the socket 10 by the sliding body 31, and stamp portions 38 and 39.

[0077] The sliding body 231 comprises a holding portion 232 that holds the held portion 235, and a slider portion 33 that is integrally formed on the outer peripheral edge of the holding portion 232 and inserted into three slide grooves 21. The retaining portion 232 is inserted through the opening of the bore portion 12 and slides within the internal space of the cylinder, including the central compartment 10c. The retaining portion 232 has an annular groove 232b formed in the center of its lower surface, with a cylindrical insertion shaft portion 232a protruding downwards. In other words, in order to form the insertion shaft portion 232a in the center of the lower surface of the retaining portion 232, the area around the insertion shaft portion 232a is carved out to form the annular groove 232b. In other words, the retaining portion 232 comprises an insertion shaft portion 232a formed in the center of the lower surface and an annular groove 232b formed around the insertion shaft portion 232a.

[0078] Furthermore, the holding portion 232 is equipped with a plurality of rollers 232c arranged in the circumferential direction of the insertion shaft portion 232a. That is, the insertion shaft portion 232a has grooves formed on its outer circumferential surface, and the plurality of rollers 232c are arranged in these grooves, with the rotation axis of each roller 232c attached to the edge portion that constitutes the groove. The roller 232c and the rotating shaft are integrated, and insertion holes are formed in the upper and lower edges of the groove for rotatably inserting the rotating shaft. The multiple rollers 232c are roughly in the shape of an inverted truncated cone (like a pudding mold turned upside down), and each roller 232c rotates around a rotation axis that runs through it from top to bottom.

[0079] The retained portion 235 has a peripheral wall portion 235a provided along the outer edge of the circular bottom and is open at the top, thus forming a roughly cup shape. The circular base is provided with a stamp storage section 235b, which can accommodate the first stamp section 38 and the second stamp section 39.

[0080] The cup-shaped retained portion 235 has an inner space of its peripheral wall portion 235a that serves as a rotating mechanism housing portion 235c. The insertion shaft portion 232a of the retaining portion 232 is inserted into the rotating mechanism housing portion 235c. That is, as soon as the insertion shaft portion 232a of the retaining portion 232 is inserted into the rotating mechanism housing portion 235c, the peripheral wall portion 235a of the retained portion 235 is inserted into the annular groove 232b of the retaining portion 232.

[0081] Of the inner surface of the peripheral wall portion 235a facing the rotating mechanism housing portion 235c, the portion where the multiple rollers 232c make contact is formed as a slope to match the inclination of the rollers 232c, which are roughly inverted truncated cone shape. As a result, the sides of the multiple rollers 232c and the inner surface of the peripheral wall portion 235a make tight contact.

[0082] The retaining portion 232 is equipped with a claw portion 234 provided on the outer edge of the annular groove 232b, and is designed to hold the retained portion 235, which is inserted into the annular groove 232b, so as not to come loose.

[0083] In the marker section 230 configured as described above, the contact points between the holding section 232 of the sliding body 231 and the held section 235 are the surfaces of the multiple rollers 232c and the inner surface of the housing section 235c of the held section 235. The stamp sections 38 and 39 contact the tip surface 3a of the shaft of the bolt 3, and the entire sliding body 231 is biased toward the insertion opening of the diameter section 12 by the biasing section 40. When the corner drive 7 of the nut runner 6 rotates, the holding section 232 of the sliding body 231 rotates in sync with the corner drive 7 while the held section 235 remains stationary.

[0084] To enable this operation, the coefficient of friction at the stamp surfaces (contact surfaces) 38a and 39a of the first stamp portion 38 and the second stamp portion 39, which are in contact with the tip surface 3a of the shaft portion of the bolt 3, is set so as not to hinder the rotation of the holding portion 232 of the sliding body 231. In other words, the rotation axis of each of the multiple rollers 232c is rotatably held with respect to the edge of a groove formed on the outer surface of the insertion shaft portion 232a of the holding portion 232. Therefore, the ease with which the held portion 235, which is rotatably held by the holding portion 232, can be rotated, or in other words, the ease with which the holding portion 232 can rotate when the socket 10 is rotated, depends on the magnitude of the coefficient of friction (frictional force) between the rotation axis of the rollers 232c and the edge of the groove in the insertion shaft portion 232a. In this modified example, the coefficient of friction at the stamp surfaces (contact surfaces) 38a and 39a of the first stamp portion 38 and the second stamp portion 39 that are in contact with the tip surface 3a of the shaft portion of the bolt 3 is set higher than the coefficient of friction between the rotation axis of the multiple rollers 232c and the edge of the groove in the insertion shaft portion 232a. At this time, the coefficient of friction between the surface of the multiple rollers 232c and the inner surface of the storage portion 235c of the held portion 235 may be higher than or about the same as the coefficient of friction at the stamp surfaces (contact surfaces) 38a and 39a of the first stamp portion 38 and the second stamp portion 39 that are in contact with the tip surface 3a of the shaft portion of the bolt 3.

[0085] With the friction coefficient set as described above, simply by performing the tightening operation of the nut 4 with the nut runner 6 as usual, markings M1 and M2 can be applied to the tip surface 3a of the shaft portion of the bolt 3 while the nut 4 is being tightened.

[0086] According to this modified example, it becomes possible to perform the tightening of bolts 3 and nuts 4 and the marking work simultaneously with a simple configuration, and it is also possible to improve the number of bolts 3 and nuts 4 that can be tightened relative to the amount of ink used.

[0087] [Variation 3] In the above embodiment, the held portion 35 is rotatably held by the holding portion 32 of the sliding body 31. This allows the socket 10 to rotate and tighten the nut 4 during the tightening operation of the nut 4, while the held portion 35 remains stationary, enabling the markings M1 and M2 to be applied to the tip surface 3a of the shaft portion of the bolt 3. In contrast, in the marking mechanism 320 of the socket 310 of this modified example, as shown in Figure 15, the entire marker portion 330 is held by the socket 310 so as to be rotatable around the axis of the socket 310.

[0088] More specifically, in this modified example, the socket 310 has a diameter portion 312 that is roughly shaped like a hexagonal hole, and mounting grooves 321 are formed at each of the six corners for mounting the marker portion 330 deep inside the cylindrical space. That is, the six mounting grooves 312a are formed from the lower section 10b to the central section 10c in the cylindrical space.

[0089] Of the six mounting grooves 321, at least three of them (with one groove skipped between each groove) have the tip of the stopper 23 protruding. The stopper 23 protrudes further toward the center of the socket 310 than the range of the mounting grooves 321. The marker portion 330 is positioned above the stopper 23 in the central section 10c. This marker portion 330 comprises a rotating body 331 (i.e., a first component) that is rotatably held within the central section 10c around the axis of the socket 310, a held portion 335 (i.e., a second component) that is held so as to be able to move back and forth in the axial direction of the socket 10 and is biased toward the insertion opening side of the diameter portion 312 by a biasing portion 340, and stamp portions 38, 39.

[0090] The rotating body 331 comprises a holding portion 332 for holding the held portion 335, a plurality (six) of rotating ends 333 integrally formed on the outer peripheral edge of the holding portion 332 and inserted along six mounting grooves 312a, and a plurality (six) of rolling elements 334 provided between the rotating ends 333 and the rotating grooves 310d formed on the inner surface of the socket 310.

[0091] The retaining portion 332 is formed in a hat shape and has an annular portion (hereinafter referred to as the annular portion 332a) and a cylindrical portion (hereinafter referred to as the cylindrical portion 332b) that protrudes upward from the edge of the annular portion 332a. The annular portion 332a is supported by multiple stoppers 23. The rotating end portion 333 is integrally formed with the outer circumferential surface of the annular portion 332a. Furthermore, the cylindrical portion 332b is provided with a plurality of slide grooves 332c in its internal space, each of which a biasing portion 340 is positioned. In this modified example, three slide grooves 332c are provided and are arranged at equal intervals around the axis of the socket 10. Therefore, three biasing portions 340 are also used in this modified example.

[0092] The retained portion 335 is formed in a cylindrical shape, and multiple (three) slider portions 335a are provided at its upper part. The lower part of the retained portion 335 is normally inserted into the hole in the annular portion 332a of the retaining portion 332. The upper part of the retained portion 335 is in a state where multiple (3) slider portions 335a are inserted into multiple (3) slide groove portions 332c in the cylindrical space of the cylindrical portion 332b of the retained portion 332. The biasing portion 340 is a coil spring, and its upper and lower ends are inserted into and held in a hole formed on the upper surface of the slider portion 335a and a hole formed at the upper end of the slide groove portion 332c. As a result, the retained portion 335 is in a state where its lower part is inserted into the hole of the annular portion 332a of the retaining portion 332, and is slidable along the cylindrical space of the cylindrical portion 332b of the retaining portion 332, while also being biased toward the insertion opening side of the diameter portion 12 by the biasing portion 340. A stamp storage section 335b is provided at the bottom of the holding section 335, and the first stamp section 38 and the second stamp section 39 can be stored there.

[0093] The rolling element 334 is a sphere. Furthermore, the rotating end 333 of the rotating body 331 has a curved recess formed on its upper surface to facilitate the rolling of the spherical rolling element 334, and the rolling element 334 is held in place by this recess. The recess may be coated with, for example, fluorine to further facilitate the rolling of the rolling element 334. The rotating groove 310d formed on the inner surface of the socket 310 is located in a stepped portion directly above the rotating end 333 of the rotating body 331 and is formed seamlessly along the circumferential direction of the socket 310. Therefore, the rolling element 334 can roll along the rotating groove 310d formed on the inner surface of the socket 310 while being held by the rotating end 333 of the rotating body 331.

[0094] The rotating body 331 is positioned within the central compartment 10c, and its annular portion 332a is supported by the stopper 23. As the multiple rotating ends 333 move along the rotating groove 310d in conjunction with the rolling of the multiple rolling elements 334, the rotating body 331 itself becomes freely rotatable around the axis of the socket 310. In particular, Furthermore, the diameter of the circular hole in the annular portion 332a of the holding portion 332 of the rotating body 331 is set to be larger than the diameter of the shaft portion of the bolt 3. Therefore, even if the shaft portion of the bolt 3 protrudes above the upper surface of the nut 4, when tightening the nut 4, the shaft portion of the bolt 3 will pass through the circular hole in the annular portion 332a. Furthermore, a stamp portion 39 is provided on the bottom surface of the retained portion 335, and the retained portion 335 is biased toward the insertion opening side of the diameter portion 312 by the biasing portion 340. Therefore, while inserting the nut 4 from the insertion opening of the diameter portion 312, the stamp surface 39a of the stamp portion 39 is brought into contact with the tip surface 3a of the shaft portion of the bolt 3. When the nut 4 is inserted until it contacts the contact surface 13 at the back of the diameter portion 312, the retained portion 335 is pushed toward the back side of the central compartment 10c, but because it is biased toward the insertion opening side of the diameter portion 12 by the biasing portion 340, the stamp portion 39 is pressed firmly against the tip surface 3a of the shaft portion of the bolt 3.

[0095] In the state described above, when the square drive 7 of the nut runner 6 is rotated, the socket 310 and nut 4 also rotate (tighten) in conjunction with the rotation of the square drive 7. However, the shaft portion of the bolt 3 and the entire marker portion 330, including the stamp portion 39, remain in a state where they do not rotate in sync with the rotation of the square drive 7.

[0096] To enable this operation, the coefficient of friction at the stamp surfaces (contact surfaces) 38a and 39a of the first stamp portion 38 and the second stamp portion 39, which are in contact with the tip surface 3a of the shaft portion of the bolt 3, is set so as not to hinder the rotation of the rotating body 331. In other words, the multiple rolling elements 334 are held in recesses on the upper surface of the rotating end 333 of the rotating body 331. The multiple rolling elements 334 are then placed in the rotating groove 310d of the socket 310 and come into contact with the surfaces that make up the rotating groove 310d. However, since the rolling elements 334 are spherical, the contact points are all point contacts, and the coefficient of friction (frictional force) between the rolling elements 334 and the rotating groove 310d is extremely low. In this modified example, the coefficient of friction at the stamp surfaces (contact surfaces) 38a and 39a of the first stamp portion 38 and the second stamp portion 39, which are in contact with the tip surface 3a of the shaft portion of the bolt 3, is set higher than the coefficient of friction between the rolling element 334 and the rotating groove 310d.

[0097] With the friction coefficient set as described above, simply by performing the tightening operation of the nut 4 with the nut runner 6 as usual, markings M1 and M2 can be applied to the tip surface 3a of the shaft portion of the bolt 3 while the nut 4 is being tightened.

[0098] According to this modified example, it becomes possible to perform the tightening of bolts 3 and nuts 4 and the marking work simultaneously with a simple configuration, and it is also possible to improve the number of bolts 3 and nuts 4 that can be tightened relative to the amount of ink used. [Explanation of Symbols]

[0099] 10 sockets 10a Upper section 10b Lower section 10c Central section 11 socket size 11a Second pin hole 12 Caliber 13 Contact surface 14. Base 15 Bulge 16 Annular surface 17 Slope 18 Groove 19 O-rings 20 Marking mechanism 21 Slide groove 22 Through hole 23 Stopper 30 Marker section 31. Slide mechanism 32 Holding part 32a groove 33 Slider section 33a Recess 33b Contact part 35 Holding part 35a Convex strip 35b Stamp storage compartment 38 First Stamp Section 38a Stamp surface 39 Second Stamp Section 39a Stamp surface 40. Encouraging part 41 Retaining hole 42 Retaining protrusion SP Socket Pin M1 markings M2 marking

Claims

1. A socket that marks a fastening member at the same time as tightening the fastening member, It comprises a cylindrical socket body and a marker portion held within the cylindrical space of the socket body. One end of the cylindrical space is a diameter portion into which the fastening member is inserted and rotational force is transmitted, and the center of the cylindrical space is a marking area for marking the fastening member. The marker portion is, A first component is rotatably mounted around the axis of the socket body, A second component engages with the first component and is provided to be able to move back and forth along the axial direction of the socket body and is biased toward the insertion opening side of the diameter portion, A socket characterized by having a stamp portion which is provided on the insertion side of the diameter portion of the marker portion and is located on the axis of the socket body, and which contacts the fastening member when the fastening member is tightened.

2. The second part is formed in an annular shape and has a circular hole, The first component is provided in the circular hole of the second component and, while engaged with the second component, is rotatably held by the second component around the axis of the socket body. The socket according to claim 1, characterized in that the coefficient of friction of the stamp portion with respect to the fastening member is set higher than the coefficient of friction of the portion where the first part and the second part engage.

3. The first component has a protrusion formed along the outer circumferential surface of the first component, The second part has a groove formed on the inner circumferential surface of the circular hole, The socket according to claim 2, characterized in that the protrusion of the first component is provided within the groove of the second component.

4. The socket according to claim 3, characterized in that a plurality of hemispherical contact portions are fixed to at least one surface of the aforementioned protrusion.

5. The socket according to claim 1, characterized in that the portion where the first component and the second component engage is coated with a material with a low coefficient of friction.

6. The second component has a cylindrical insertion shaft portion that protrudes toward the first component and has a plurality of rollers arranged along its outer surface. The first component has a roughly cup-shaped storage section into which the insertion shaft portion is inserted and housed. The socket according to claim 1, wherein the first component is held by the second component with the insertion shaft portion inserted into and stored in the storage portion, and the plurality of rollers on the insertion shaft portion are in contact with the inner surface of the storage portion in the first component.

7. The socket according to claim 1, characterized in that the first component is provided on the insertion side of the diameter portion of the first component and includes a stamp storage portion in which the stamp portion is housed.

8. The first component is held by the socket body so as to be rotatable around the axis of the socket body, and the first component is formed in an annular shape and has a circular hole. The second component is provided in the circular hole of the first component and is held in a state of engagement with the first component, so as to be able to move back and forth along the circular hole. The socket according to claim 1, characterized in that the coefficient of friction of the stamp portion in contact with the fastening member is set higher than the coefficient of friction of the portion in contact with the first component and the socket body.

9. The aforementioned first component is, A holding portion for holding the second component, Multiple rotating ends are integrally formed on the outer peripheral edge of the holding portion and protrude outward, It comprises a plurality of rolling elements held by each of the plurality of rotating ends, The aforementioned socket body is The socket according to claim 8, characterized in that it has a rotating groove formed along the circumferential direction of the socket body, which houses the plurality of rolling elements in the first component.

10. The socket according to claim 8, characterized in that the second component is provided on the insertion side of the diameter portion of the second component and includes a stamp storage portion in which the stamp portion is housed.

11. The aforementioned stamp portion is A first stamp portion having a projection in the center of the stamp surface that contacts the fastening member, The socket according to any one of claims 1 to 10, characterized in that it has a second stamp portion in which the stamp surface that contacts the fastening member is formed to be flat.

12. The socket according to claim 11, characterized in that the paint used for the first stamp portion and the second stamp portion are set to different colors.

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