socket

Abstract

To provide a socket in which a printing body is hardly worn.SOLUTION: The socket 10 is mounted on a fastening tool, provided with a casing 11 to be put on a bolt B or a nut N to be fastened and a marking member 20 installed in the casing 11 and energized in the direction of the bolt B by an elastic body SP, and marks the bolt B, wherein the marking member 20 is provided with a marking body 30 and a supporting member 40 for rotatably supporting the marking body 30, and the supporting member 40 is not rotatable in the circumferential direction with respect to the casing 11.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a socket to be attached to a fastening tool such as a torque wrench. [Background technology]

[0002] When fastening members such as bolts and nuts using a fastening tool such as a torque wrench, a mark is applied to the fastening members with paint to indicate that the fastening has been completed with the specified torque. It is also known to provide a marking function to a fastening socket attached to the fastening tool, so that a mark is automatically applied during fastening.

[0003] Patent Document 1 describes a marking device that is fixed inside a socket with a set screw. This marking device has a sponge marking head slidably mounted inside a cylindrical case, and the marking head is biased toward the threaded portion of the bolt. When the socket is attached to a torque wrench and inserted into a pre-tightened nut, the rubbing surface 12 of the marking head 11 is pressed against the tip of the threaded portion 6. When the torque wrench is rotated in this state to tighten the nut to the specified tightening level, the rubbing surface of the marking head rubs against the tip of the threaded portion, leaving a circular mark on the tip of the threaded portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 59-124073 Summary of the Invention [Problem to be solved by the invention]

[0005] In the marking device described in Patent Document 1, the marking head is pressed against the tip of the bolt while rotating in accordance with the rotation of the socket, which poses the problem of the marking head, which is the printing body, being prone to wear.

[0006] SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional socket and to provide a socket in which the printed body is less susceptible to wear. [Means for solving the problem]

[0007] In order to solve the above problem, a socket for marking the bolt is provided, which comprises a housing that is attached to a fastening tool and placed over the bolt or nut to be fastened, and a marking member that is housed within the housing and is biased toward the bolt by an elastic body, wherein the marking member comprises a marking body and a support member that rotatably supports the marking body, and the support member is unable to rotate circumferentially relative to the housing.

[0008] It is also preferable that the support member is provided with a bearing member, and the marking body is supported rotatably relative to the support member via the bearing member.

[0009] It is also preferable that the marking body is detachably attached to the support member and is configured to be removed from the support member by being pushed in from the opposite side of the marking surface.

[0010] It is also preferable that the marking body is provided with a locking piece that engages with the inner ring of the bearing member, and that the engagement between the marking body and the inner ring is released when the locking piece elastically deforms under external force. [Effects of the Invention]

[0011] The present invention makes it possible to provide a socket in which the printed body is less susceptible to wear. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a perspective view of the socket according to the embodiment. [Figure 2] FIG. 2 is a perspective view of the socket according to the embodiment. [Figure 3] FIG. 2 is a plan view of the socket according to the embodiment. [Figure 4] FIG. 2 is a bottom view of the socket according to the embodiment. [Figure 5] 1 is a schematic diagram showing a state in which the socket of the embodiment is placed over a bolt and a nut that fasten a plate-shaped member. FIG. [Figure 6] 6 is a cross-sectional view taken along line BB in FIG. 5, illustrating a process of placing the socket of the embodiment over the bolt and nut. [Figure 7] FIG. 2 is a perspective view of the marking member according to the embodiment. [Figure 8] FIG. 2 is a plan view of the marking member according to the embodiment. [Figure 9] FIG. 2 is a perspective view of the marking member according to the embodiment. [Figure 10] FIG. 2 is a bottom view of the marking member according to the embodiment. [Figure 11] FIG. 2 is an exploded perspective view of the marking member according to the embodiment. [Figure 12] FIG. 1(a) is a front view of the marking member according to the embodiment, and FIG. 1(b) is a cross-sectional view taken along line CC of FIG. [Figure 13] FIG. 2 is a perspective view of a print body holder according to an embodiment. [Figure 14] FIG. 2 is a plan view of the print body holder of the embodiment. [Figure 15] FIG. 2 is a front view of the print body holder according to the embodiment. [Figure 16] FIG. 16 is a cross-sectional view taken along the line DD in FIG. 15. [Figure 17] 10A to 10C are explanatory diagrams showing a process of attaching the marking body of the embodiment to a support member. [Figure 18] 10A to 10C are explanatory views showing a process of removing the marking body of the embodiment from the support member. [Figure 19] 4 is a cross-sectional view taken along the line AA in FIG. 3. [Figure 20] FIG. 10 is a perspective view showing a marking member according to a modified example. [Figure 21] FIG. 10 is a cross-sectional view showing a socket of a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0013] The following describes an embodiment of the invention. The socket 10 of the embodiment is attached to a fastening tool such as a torque wrench, and is placed over a bolt or nut (hereinafter sometimes collectively referred to as "objects to be fastened") to be fastened, and is used to tighten the object. The socket 10 applies markings to the bolt as the object is tightened.

[0014] The socket 10 of this embodiment rotates around a rotation axis X shown in Figure 6(b). The rotation axis X coincides with the center line of the socket 10. In this specification, the direction in which the rotation axis X of the socket 10 extends is referred to as the "axial direction," the direction perpendicular to the axial direction is referred to as the "radial direction," and the direction around the rotation axis X of the socket 10 is referred to as the "circumferential direction."

[0015] (Housing) The socket 10 of this embodiment includes a housing 11 that is fitted over an object to be fastened, and a marking member 20 that is housed within the housing 11 and biased toward the bolt by an elastic body. As shown in FIGS. 1 and 2, the housing 11 of this embodiment has a generally cylindrical exterior shape extending in the axial direction, with a square-hole-shaped insertion angle 12 at one axial end and a fitting hole 13 at the other axial end into which a bolt head or nut fits. Hereinafter, in this specification, the side of the insertion angle 12 of the socket 10 is referred to as the base end, and the side of the fitting hole 13 is referred to as the tip end. The housing 11 of this embodiment is made of synthetic resin, but is not limited to this.

[0016] The drive 12 of the embodiment is a rectangular hole into which the drive 90 of the fastening tool (see FIGS. 5 and 6(a)) is fitted. As shown in FIG. 3, the drive 12 of the embodiment is formed in a square shape in a plan view. When not attached to the fastening tool, the top surface of the marking member 20 is exposed to the outside through the drive 12.

[0017] 1 and 2, the housing 11 of the embodiment is provided with a pair of pin insertion holes 14 that open to the side and communicate with the drive angle 12. In addition, an O-ring groove 15 is formed on the outer circumferential surface of the housing 11 of the embodiment at a position corresponding to the pin insertion holes 14.

[0018] When mounting the socket 10 on the fastening tool, the drive unit 90 (see FIG. 6(a)) with a through hole 91 is inserted into the drive unit 12, and one pin 92 (see FIG. 6(a)) is inserted so that it passes through the through hole 91 of the drive unit 90 and the pin insertion hole 14 of the socket 10. Then, an O-ring (not shown) is fitted into the O-ring groove 15 to close the outside of the pin insertion hole 14. This connects the drive unit 90 and the socket 10 without the pin 92 falling out, completing the mounting of the socket 10 on the fastening tool.

[0019] The socket 10 attached to the fastening tool is placed over the bolt B or nut N to be fastened. The socket 10 in the example shown in Figures 5 and 6(a) is placed over the bolt B and nut N that have been provisionally fastened (primarily fastened) to a plate-like member P, which is the object to be fastened. Note that, although the object to be fastened in this example is a nut N, the object to be fastened is not limited to this, and the object to be fastened may also be the head of the bolt B. In this example, a washer W is provided between the nut N and the plate-like member P.

[0020] The object to be fastened is fitted into the fitting hole 13 of the socket 10. In this embodiment, the fitting hole 13 is a hexagonal hole into which the head of the bolt B or the nut N can be fitted. The fitting hole 13 is not limited to a hexagonal shape as long as it is a shape that matches the shape of the object to be fastened, and may be, for example, a dodecagonal shape.

[0021] As shown in FIG. 4, the fitting hole 13 of the embodiment has positioning recesses 131 formed at 120-degree intervals on three corners of the hexagon. The positioning recesses 131 of the embodiment are grooves that extend in the axial direction and are approximately semicircular in bottom view (see FIG. 2). The positioning recesses 131 of the embodiment are formed from the opening of the fitting hole 13 to the base end side of the marking member slide hole 16, which will be described later. The shape of the positioning recesses 131 corresponds to the outer shape of the marking member 20, which will be described later. The marking member 20 is positioned in the circumferential direction by the positioning recesses 131 and is housed in the housing 11. In the socket 10 of the embodiment, the print element 31 provided on the marking member 20 is exposed to the outside through the fitting hole 13, as viewed from the bottom.

[0022] The housing 11 of the embodiment has a hollow shape with an interior that is open from the base end side to the tip end side. As shown in Fig. 6(a), in the housing 11 of the embodiment, the insertion angle 12 on the base end side and the fitting hole 13 on the tip end side are connected via the marking member sliding hole 16. The marking member sliding hole 16 of the embodiment is a hole with a substantially circular cross section as a whole, and positioning recesses 131 that are recessed radially outward are provided at 120-degree intervals (see Fig. 4). The diameter of the marking member sliding hole 16 is larger than the insertion angle 12.

[0023] As shown in Figure 6(a), a marking member 20 having a printing body 31 on its tip surface is arranged in the marking member sliding hole 16 of this embodiment so as to be axially slidable. The marking member 20 arranged in the marking member sliding hole 16 is biased toward the bolt B (the tip side of the socket 10) by a coil spring SP, which is an elastic body. The detailed assembly structure of the marking member 20 of this embodiment will be described in detail later.

[0024] As shown in Figure 6(b), when the socket 10 is placed on the object to be fastened (nut N in this example) to tighten it, the printing body 31 is pressed against the tip of the shank of the bolt B, leaving a mark. This mark serves as a guide indicating that the object to be fastened has been tightened with the specified torque.

[0025] (marking material) The configuration of the marking member 20 of the embodiment will be described. As shown in Figures 7 and 8, the marking member 20 of the embodiment includes a marking body 30 and a support member 40 that rotatably supports the marking body 30. As shown in Figures 9 and 10, a printing body 31 is provided on the bottom surface (the surface on the tip side) of the marking body 30. Furthermore, as shown in Figure 11, the marking body 30 of the embodiment is detachably attached to the support member 40.

[0026] (support member) First, the support member 40 of the embodiment will be described. The support member 40 of the embodiment includes a case portion 41 and a bearing member 42 housed in the case portion 41, as shown in FIG.

[0027] The case 41 of this embodiment is made of resin and is formed in a covered cylindrical shape with an open bottom, as shown in Figures 9 to 11. As shown in Figure 11, the case 41 of this embodiment has a cylindrical side wall 411 and a top surface 412 that is generally annular in plan view. A generally circular operation window 413 opens in the center of the top surface 412. In this embodiment, the marking body 30 can be removed through the operation window 413.

[0028] A bearing member 42 is attached inside the case portion 41. The bearing member 42 in this embodiment is a ball bearing, and as shown in FIG. 12 , includes an inner ring 421, an outer ring 422, and rolling elements 423. The inner ring 421 and the outer ring 422 are cylindrical bodies that are arranged opposite each other with the rolling elements 423 interposed therebetween. The rolling elements 423 in this embodiment are steel balls that are rotatably supported by a retainer. Note that the bearing member 42 is not limited to a ball bearing, and may be a roller bearing.

[0029] In the embodiment, bearing receiving portions 414 that support the bearing member 42 are formed on the side wall 411 of the case portion 41. As shown in Figures 9 to 12, the bearing receiving portions 414 in the embodiment are locking claws formed by cutting out the side wall 411 of the case portion 41. In this example, three bearing receiving portions 414 are provided at 120-degree intervals.

[0030] When the bearing member 42 is pushed into the case portion 41 from the bottom side, the bearing receiver 414 elastically deforms and engages with the bottom surface of the bearing member 42. In the example shown in Figures 9 and 10, the bearing receiver 414 engages with the bottom surface of the outer ring 422 of the bearing member 42, and the outer ring 422 is fixed to the case portion 41. Note that the mounting structure of the bearing member 42 to the case portion 41 is not limited to this.

[0031] In this embodiment, at least a portion of the top surface of the inner ring 421 of the bearing member 42 attached to the case portion 41 is located radially inward from the operation window 413 (see FIGS. 7 and 8). In this embodiment, a locking claw 325 of the marking body 30 (described later) engages with the top surface of the inner ring 421 exposed from the operation window 413, thereby fixing the marking body 30 to the inner ring 421.

[0032] 11, the case 41 of this embodiment has protrusions 415 that protrude radially outward from the side wall 411. In this example, the protrusions 415 are formed in a semi-cylindrical shape extending in the axial direction, and three of them are provided at 120-degree intervals. A pin 416 having a generally cylindrical shape that protrudes axially outward is provided on the top surface of each protrusion 415. A set screw locking portion 417, which is an elongated hole through which a set screw S1 (described later) is inserted, is provided on the side surface of the protrusions 415.

[0033] (marking body) As shown in FIGS. 9 to 11, the marking body 30 of the embodiment includes a printing body 31 and a printing body holder 32 that holds the printing body 31.

[0034] The printing body 31 in this embodiment is a felt printing body that can be impregnated with marking ink. By contacting the bolt B, which is the object to be marked, the printing body 31 can attach a mark to the tip surface of the head or shank of the bolt B. Note that the printing body 31 in the example shown in Figures 9 and 10 has a substantially circular printing surface and applies a substantially circular mark to the bolt B. The material and shape of the printing body 31 can be arbitrary. For example, the shape of the printing surface may be substantially circular or linear.

[0035] There are no particular limitations on the ink to be impregnated into the printing body 31, as long as it is ink that can be used for outdoor marking. The printing body 31 may also be configured to include an ink occlusion body that can supply ink.

[0036] 12(b), the print body 31 of this embodiment is fitted into a resin print body retainer 311 and attached to a mounting recess 321 formed on the bottom surface (the surface on the tip side) of the print body holder 32. In this example, a slight protrusion is formed on the inner peripheral surface of the mounting recess 321, and the print body retainer 311 is press-fitted and fixed into the mounting recess 321. The method of attaching the print body 31 to the print body holder 32 is not limited to this, and for example, the print body retainer 311 may be adhesively fixed to the mounting recess 321.

[0037] The print element holder 32 of this embodiment is a resin member, and is formed generally in a disk shape as shown in Fig. 11. As shown in Figs. 13 to 16, the bottom surface of the print element holder 32 is provided with a mounting recess 321 that is generally circular in bottom view, and a flange 322 formed on the outer periphery of the mounting recess 321. In addition, a reinforcing rib 323 is provided on the top surface of the print element holder 321 of this embodiment.

[0038] As shown in FIG. 15 , a bridge-shaped locking piece 324 is erected on the top surface of the print-element holder 321. The locking piece 324 is a component that engages with the inner ring 421 of the bearing member 42. In this embodiment, the locking piece 324 is generally U-shaped when viewed from the front, and the upper part of the U-shape is a concave arc shape with a gentle recess in the center, gradually thinning from both ends toward the center. This allows the locking piece 324 of this embodiment to easily elastically deform in a direction that moves the center toward the bottom surface of the print-element holder 321 when an external force is applied, and to easily return to its original shape when the external force is released. Note that the shape of the locking piece 324 is not limited thereto; for example, it may be formed into a gentle, approximately V-shape when viewed from the side. Furthermore, the locking piece 324 may have a crease in the center to facilitate elastic deformation.

[0039] 14, the locking piece 324 of this embodiment is provided so that the upper part of the U-shape extends radially at approximately the center of the top surface of the print element holder 321. The locking piece 324 is approximately perpendicular to the rib 323 in a plan view. The rib 323 suppresses deformation of the entire print element holder 32 when the locking piece 324 elastically deforms.

[0040] Locking claws 325, 325 that protrude radially outward are provided at both ends of the locking piece 324. As shown in Fig. 15, the locking claws 325 of this embodiment have tapered surfaces that protrude outward toward the bottom surface.

[0041] (How to attach and remove the marking body) The marking body 30 of this embodiment is rotatably supported on the support member 40 via the bearing member 42. More specifically, the marking body 30 is fixed to the inner ring 421 of the bearing member 42, so that the marking body 30 can rotate integrally with the inner ring 421 in the circumferential direction.

[0042] Here, the procedure for attaching the marking body 30 of the embodiment to the support member 40 will be described with reference to Fig. 17. For simplicity, Fig. 17 shows only the inner ring 421 of the support member 40, and omits the illustration of members other than the inner ring 421. In addition, a longitudinal cross section of the inner ring 421 is shown in the figure.

[0043] When attaching the marking body 30 of this embodiment to the inner ring 421, as shown in FIG. 17(a), the locking piece 324 of the marking body 30 (printing body holder 32) is inserted into the inner ring 421 from the tip side. The inner diameter D1 of the inner ring 421 of this embodiment is slightly smaller than the distance D2 between the outermost protruding portions of the pair of locking claws 325. Therefore, when the locking piece 324 is inserted into the inner ring 421, the tapered surfaces of the locking claws 325 are pressed from the outside by the inner peripheral surface of the inner ring 421, causing the locking piece 324 to elastically deform toward the bottom side. At the same time, the locking claw 325 is pulled inward, allowing the locking piece 324 to pass through the inside of the inner ring 421 as shown in FIG. 17(b).

[0044] 17(c), when the marking body 30 is pushed in to a position where the locking claws 325 escape from the top surface of the inner ring 421 to the upper side in the figure, the locking pieces 324 are released from the pressure from the inner peripheral surface of the inner ring 421 and return to their original shape. As a result, the locking claws 325, 325 that had been pulled inward return to their original state and engage with the top surface of the inner ring 421, and the marking body 30 is locked to the inner ring 421.

[0045] In this example, the axial dimension of the inner ring 421 is approximately the same as the dimension from the locking claw 325 to the flange 322 of the printing body holder 32. Therefore, when the locking claw 325 engages with the top surface of the inner ring 421, the flange 322 abuts against the bottom surface of the inner ring 421, and the marking body 30 is fitted and fixed to the inner ring 421.

[0046] Next, we will explain how to remove the marking body 30 from the inner ring 421. The marking body 30 of this embodiment is configured to be removed from the support member 40 by being pushed in from the side opposite the marking surface (the surface having the printing body 31).

[0047] As shown in Figure 18(a), when the marking body 30 attached to the inner ring 421 is pushed from the base end side to the tip end side, as shown in Figure 18(b), the locking pieces 324 are subjected to an external force and elastically deform, causing the locking claws 325 to be pulled inward, and the engagement between the locking claws 325 and the inner ring 421 is released. This allows the marking body 30 to move downward in the figure relative to the inner ring 421.

[0048] As shown in Figure 18(c), when the marking body 30 is pushed further toward the tip, the marking body 30 with the locking claws 325 retracted inward passes through the inside of the inner ring 421. When the marking body 30 is pushed further toward the tip, the marking body 30 escapes from the inner ring 421 and is removed, as shown in Figure 18(d).

[0049] In the above-described embodiment, the marking body 30 can be removed from the support member 40 by inserting a finger into the drive angle 12 from the base end side of the socket 10 and pushing the marking body 30 toward the tip side. Also, the marking body 30 can be attached to the support member 40 by pushing the marking body 30 into the inner ring 421 through the fitting hole 13 of the socket 10. This configuration is preferable because it makes the stamp face replacement work easier.

[0050] (Attachment structure of marking member to housing) 19, the marking member 20 is attached to the inside of the housing 11 with the printing body 31 facing the tip side. In this embodiment, the support member 40 of the marking member 20 is fixed to the housing 11 so as to be slidable in the axial direction and unrotatable in the circumferential direction.

[0051] The marking member 20 of the embodiment is arranged so that at least a portion thereof is located inside the marking member sliding hole 16. The housing 11 of the embodiment is formed with three spring receiving recesses 17 at positions radially outward of the insertion angle 12, which are connected to the marking member sliding hole 16 and recessed toward the base end.

[0052] The base ends of the coil springs SP are inserted into these spring receiving recesses 17. The coil springs SP are compression springs that can expand and contract in the axial direction. The coil springs SP are disposed between the housing 11 and the marking member 20 to bias the marking member 20 toward the bolt B.

[0053] The marking member 20 of the embodiment is inserted into the housing 11 through the fitting hole 13. The marking member 20 is positioned so that the three protrusions 415 fit into the positioning recesses 131, and is then housed in the housing 11 after being positioned in the circumferential direction (see FIG. 4). In addition, in the housing 11 of the embodiment, the positions of the positioning recesses 131 correspond to the positions of the spring receiving recesses 17, and the pin portions 416 provided on each protrusion 415 are inserted into the tip side of each coil spring SP (see FIG. 19).

[0054] In this embodiment, a threaded hole is formed on the side of the housing 11. The threaded hole communicates with the positioning recess 131 and opens into the marking member slide hole 16. When a setscrew S1, such as a truss screw, is threaded into this threaded hole, the shaft of the setscrew S1 engages with the setscrew locking portion 417 of the support member 40 (see FIGS. 4 and 19). As a result, the support member 40 is supported from the lower side in the figure by the setscrew S1. At this time, the support member 40 is supported so as to be slidable in the axial direction relative to the housing 11. Furthermore, because the protrusion 415 is positioned by the positioning recess 131, the support member 40 cannot rotate in the circumferential direction relative to the housing 10.

[0055] When the socket 10 of the embodiment is placed over an object to be fastened and tightened (see FIG. 6(b)), the printing body 31 is pressed against the bolt B by the biasing force of the coil spring SP, and the socket 10 and the nut N rotate around the rotation axis X. When the socket 10 rotates around the rotation axis X, the support member 40, which is attached to the housing 11 so as not to be able to rotate in the circumferential direction, also rotates integrally with the housing 11.

[0056] Meanwhile, as described above, the marking body 30 equipped with the printing body 31 is rotatably supported relative to the support member 40 via the bearing member 42. More specifically, the marking body 30 of the embodiment is supported by the inner ring 421 of the bearing member 42 fixed to the support member 40. The outer ring 422 of the bearing member 42 is fixed to the support member 40 and therefore rotates circumferentially in conjunction with the support member 40 and the housing 11. However, the rolling elements 423 of the bearing member 42 do not transmit the rotation of the outer ring 422 to the inner ring 421, so that the inner ring 421 does not rotate even when the outer ring 422 rotates. Therefore, even when the socket 10 rotates, the inner ring 421 and the marking body 30 supported by the inner ring 421 do not rotate and remain stationary. In this way, in the socket 10 of the embodiment, the printing body 31 is prevented from rotating while being pressed against the bolt, and the printing body 31 is less likely to wear.

[0057] Furthermore, in this embodiment, the marking body 30 and the support member 40 are connected via the bearing member 42, which allows the housing 11 to rotate smoothly and makes it easier to suppress wear on the printing body 31.

[0058] (Variation) Next, a modified example of the embodiment will be described with reference to Figures 20 and 21. The modified example shown in the figure differs from the embodiment described above in the mounting structure of the support member 40 to the housing 11.

[0059] As shown in FIG. 20, in the marking member 20 according to the modified example, screw holes 418 are provided on the base end side surfaces of the protrusions 415 formed on the side surfaces of the case part 41 of the support member 40.

[0060] 21(a), the housing 11 of the modified example is formed with a setscrew sliding hole 18 that opens to the top surface and communicates with the marking member sliding hole 16. The setscrew sliding holes 18 of the embodiment are vertical holes extending in the axial direction, and three setscrew sliding holes 18 are provided at positions corresponding to the positioning recesses 131 on the radially outer side of the drive angle 12. The setscrew sliding holes 18 include, in order from the base end side, a first large diameter portion 18a that opens to the top surface of the housing 11, a small diameter portion 18b that is smaller in diameter than the first large diameter portion 18a, and a second large diameter portion 18c that is larger in diameter than the small diameter portion 18b and communicates with the marking member sliding hole 16. The second large diameter portion 18c serves as a spring receiving recess into which the base end side of the coil spring SP is inserted.

[0061] A setscrew S2 is inserted into each setscrew sliding hole 18 from the base end side. The setscrew S2 in the example shown in Figure 21(a) is a long, thin screw with a male thread on the tip side. The setscrew S2 inserted into the setscrew sliding hole 18 is inserted into the inside of the coil spring SP and is screwed into a threaded hole 418 formed in the top surface of the protrusion 415 of the support member 40.

[0062] When the marking member 20 is not subjected to pressure from the tip side (see Figure 21(a)), the head of the set screw S2 abuts against the step between the first thick diameter portion 18a and the thin diameter portion 18b of the set screw sliding hole 18, and the marking member 20 is supported in the middle part of the housing 11.

[0063] 21(b), when the marking member 20 is pressed from the distal end toward the proximal end, the marking member 20 is pushed up against the biasing force of the coil spring SP. The head of the set screw S2 in the modified example is slidable in the axial direction within the first large diameter portion 18a, and the marking member 20 suspended by the set screw S2 is also slidable in the axial direction within a predetermined range relative to the housing 11. In this example, when the top surface 412 of the pushed-up support member 40 comes into contact with the ceiling of the marking member sliding hole 16, the head of the set screw S2 becomes substantially flush with the top surface of the housing 11 and does not protrude outward from the housing 11.

[0064] With the configuration of the above-described modified example, the setscrew S2 is housed inside the housing 11 and the screw head is not exposed on the side surface of the housing 11, so that the appearance of the socket 10 can be improved.

[0065] Although the present invention has been described above by taking the embodiments as examples, the present invention is not limited to the above-described embodiments and can be embodied in various forms. [Explanation of symbols]

[0066] 10 sockets 11. Housing 12 socket 13 Fitting hole 131 Positioning recess 14 O-ring groove 15 pin insertion holes 16 Marking member sliding hole 17 Spring receiving recess 18 Set screw sliding hole 18a First large diameter section 18b Narrow diameter part 18c Second large diameter section SP coil spring S1, S2 set screws 20 Marking material 30 Marking body 31 Printing style 32 Printing body holder 321 Mounting recess 322 flange 323 Ribs 324 Locking piece 325 Locking claw 40 Support member 41 Case part 411 Side wall 412 Top 413 Operation window 414 Bearing holder 415 Protrusion 416 Pin section 417 Set screw locking part 418 screw hole 42 Bearing material 421 Inner circle 422 outer ring 423 Rolling elements B Bolt N nut P Plate member (object to be fastened) 90 drive angle 91 Through hole 92 pins

Claims

[Claim 1] a housing that is attached to the fastening tool and that is placed over the bolt or nut to be fastened; a marking member that is housed in the housing and biased toward the bolt by an elastic body, the socket for marking the bolt, The marking member is A socket comprising: a marking body; and a support member that rotatably supports said marking body, said support member being unable to rotate in a circumferential direction relative to said housing.

Images