JP2019011827A - screw - Google Patents

Abstract

To provide a screw capable of simply changing an angular position of an operation part after completion of fastening, in a screw capable of being fastened with hands.SOLUTION: A screw 11 comprises a screw body 21, an operation part 22 and an engagement mechanism 23. The screw body 21 has a male screw part 27 and a head part 29. The operation part 22 is configured to rotate the screw body 21 around an axis. The engagement mechanism 23 comprises a tooth row 31 and a groove row 36, and is configured to engage the head part 29 and the operation part 22 in a releasable manner. The operation part 22 is held between an engagement position where rotational force of the operation part 22 can be transmitted to the screw body 21 by engaging the groove row 36 with the tooth row 31, and a release position of releasing the engagement between the groove row 36 and the tooth row 31, wherein at the release position, rotation to the screw body 21 is allowed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a screw.

  A screw that can be hand-tightened without using a tool such as a screwdriver is known (see Patent Document 1 and Patent Document 2 below). Such a screw includes a screw body and an operation unit for an operator to hold and operate. In the screw described in Patent Document 1, torque release means using a spring is provided between a shaft portion (screw body) and a head portion (operation portion) supported by the upper end of the shaft portion. The screw described in Patent Document 1 prevents excessive tightening of the screw by torque releasing means so that the head rotates idly with respect to the shaft portion when a rotational force exceeding a predetermined value is applied to the head. .

  On the other hand, in the mounting screw described in Patent Document 2, the operation portion rotates around an axis orthogonal to the axial direction of the screw and can be folded. Thereby, after the screw is fastened, the operation portion can be folded to reduce the protruding amount in the axial direction.

JP-A-11-173317 Japanese Utility Model Publication No. 63-139312

  The inventors are considering using such a hand-tightened screw as a screw for fixing the accommodated electronic device to the rack when the electronic device is accommodated in the rack, for example. An example of the rack is a vertical rack that can accommodate a plurality of electronic devices arranged in the vertical direction. The rack is provided with a plurality of slot-shaped unit sections for storing a plurality of electronic devices, and one electronic device is stored in each unit section. Each electronic device is fixed to the position of each unit section with a screw.

  The plurality of electronic devices are, for example, components of electric equipment for broadcasting or communication. In such an electrical facility, there are cases where the electronic device is frequently attached to or removed from the rack for reasons such as maintenance of the electronic device that is a component or change of the device configuration. Therefore, if screws that can be hand-tightened are used for fixing the electronic device to the rack, the electronic device can be easily attached and detached, which is very convenient.

  However, the screws described in Patent Documents 1 and 2 have the following problems when used in the rack as described above. First, the screw described in Patent Document 1 has an ear-shaped operation portion of the screw, which is relatively large so that it can be easily grasped by hand, and is large in the radial direction with respect to the shaft portion of the screw. It protrudes. When fixing an electronic device to a rack, both end portions in the width direction of the electronic device are often fastened with screws from the front side. In this case, if the size of the screw operation unit is large, the operation unit protrudes outside the unit section of the rack. If the amount of protrusion is large, it may cause catching, and the appearance is not preferable.

  In the screw described in Patent Document 1, when a predetermined rotational force is applied to the operation unit at the time of fastening, the operation unit idles with respect to the shaft unit. Therefore, depending on the angular position of the operation unit when the fastening is completed, the amount of protrusion of the rack outside the unit section may be reduced. However, in the screw described in Patent Document 1, the angular position of the operation unit at the completion of fastening cannot be freely controlled. In addition, even after the completion of the fastening, even if the angular position of the operation unit can be changed by idling the operation unit by applying a rotational force of a predetermined value or more, a large force is required for this purpose, so it is not easy. .

  Moreover, the screw described in Patent Document 2 also has a relatively large operation portion so that it can be easily tightened by hand, similarly to the screw described in Patent Document 1. The operation portion is provided so as to be able to be folded by rotating about a deployment position protruding in the axial direction of the screw and an orthogonal axis orthogonal to the axial direction from the deployment position. By folding the operating portion, the amount of protrusion of the screw in the axial direction can be reduced.

  However, similarly to the screw described in Patent Document 1, the angle position of the operation unit at the time of completion of fastening is not freely controllable, and depending on the angle position at the time of completion of fastening, The amount of protrusion outside the unit section of the rack may become large.

  An object of this invention is to provide the screw which can change the angle position of an operation part simply in the screw which can be hand-tightened after completion | finish of fastening.

  In order to achieve the above object, a screw according to the present invention includes a screw main body, an operation unit, and an engagement mechanism. The screw body is formed with a screw portion, and has a head on the base end side opposite to the tip in the axial direction of the screw portion. The operation unit is disposed on the head and is used to manually rotate the screw body about the axis. The engagement mechanism releasably engages the head and the operation unit. The engagement mechanism engages the head portion with the operation portion, thereby engaging the engagement position where the rotational force of the operation portion can be transmitted to the screw body, and sliding the operation portion in the axial direction from the engagement position. The operation unit is slidably held between the head and the release position where the engagement of the operation unit is released, and the operation unit is rotatably held around the axis independently of the screw body at the release position. .

  The engagement mechanism preferably includes a spring that urges the operation unit toward the engagement position.

  It is preferable that an engagement portion is provided on one of the operation portion and the head, and an engaged portion that engages with the engagement portion is provided on the other.

  One of the engaging part and the engaged part is a tooth row composed of a plurality of teeth arranged at equal angular intervals around the axis and protruding in the axial direction, and the other meshes with the tooth row at the engaging position. A groove row is preferred.

  The operation unit preferably includes an operation unit main body and a handle unit. The operating portion main body has an engaging portion. The handle portion is a handle portion that is provided on the operation portion main body and is gripped by a hand, and is disposed on the opposite side of the engagement portion in the axial direction, and extends from the deployed position protruding in the axial direction from the operation portion main body to the axial direction. Folding is possible by rotating around an orthogonal axis.

  The handle portion is U-shaped, and it is preferable that both end portions that are U-shaped open ends are attached to the operation portion main body in a posture that sandwiches the operation portion main body.

  In the folded state of the handle portion, it is preferable that the protruding amount in the axial direction from the operation portion main body is zero.

  The screw body preferably has a guide portion having a smaller outer diameter than the screw portion at the tip of the screw portion opposite to the head portion in the axial direction.

  According to the present invention, in a screw that can be hand-tightened, the angle position of the operation unit can be easily changed after the completion of fastening.

FIG. 2 is an external perspective view of a rack to which an electronic device is attached with the screw of the present invention. It is a front view of the rack with which the electronic device was attached. It is a perspective view which shows a screw, an electronic device, and a rack. It is a perspective view of a screw. It is a disassembled perspective view of a screw. It is sectional drawing of the screw which made the operation part the engagement position. It is a top view of a screw body. It is a bottom view of an operation part. It is a perspective view of sectional drawing of the screw which made the operation part the engagement position. It is a perspective view of sectional drawing of the screw which made the operation part the release position. It is a perspective view of the sectional view of the screw which changed the angle position of the operation part after making the operation part into a release position. It is a perspective view of a sectional view of a screw which changed an angle position of an operation part, and made an operation part into an engagement position. It is a perspective view around a screw hole and a through hole before fastening a screw. It is a perspective view which shows the state in which the screw is fastened to the screw hole. It is the elements on larger scale of the state where the screw fastened to the screw hole protruded from the unit section of electronic equipment. It is a side view of the periphery of a screw that protrudes from a unit section of an electronic device when fastened to a screw hole. FIG. 6 is a side view of the periphery of the screw with the operation unit in a release position after being fastened to the screw hole. It is a side view of the screw periphery which changed the angle position of the operation part after making an operation part into a release position. It is a side view of the screw periphery which changed the angle position of the operation part, and made the operation part the engagement position. It is the elements on larger scale of the state which folded the handle | steering-wheel part and the screw was settled in the unit division of the electronic device. It is a bottom side perspective view of the screw of the modification which used the screw part as the internal thread. It is a perspective view of the screw of the modification which formed the handle part integrally in the operation part.

[Schematic configuration of electronic equipment and rack]
As shown in FIGS. 1 and 2, a mounting screw 11 will be described as an example of the screw according to the present invention. The attachment screw 11 is used, for example, for attaching the electronic device 12 to the rack 13. The electronic device 12 is, for example, a component of electrical equipment for broadcasting or communication. More specifically, the electronic device 12 includes, for example, a player that reproduces sound, a recorder that records sound, and an amplifier. The electrical equipment is configured by combining these various electronic devices 12. A plurality of electronic devices 12 are accommodated in the rack 13.

  The rack 13 is a 19-inch rack conforming to the EIA standard, for example. The 19-inch rack has standardized dimensions, and has a width of 19 inches (about 482.6 mm) and a height of 1.75 inches (44.45 mm) as a unit compartment, and can accommodate the electronic devices 12 arranged vertically. It is a vertical rack. The rack 13 has a box shape having openings 16 on the front surface. A plurality of screw holes 17a are formed on the front surface of the side plate 17 arranged on both sides of the opening 16 at a predetermined pitch for each unit section. Has been. In the present embodiment, two screw holes 17a are formed for each unit section.

  As shown in FIG. 3, the electronic device 12 has a substantially rectangular parallelepiped outer shape that fits in a 19-inch rack unit width of 19 inches and a height of 1.75 inches. On both side surfaces of the electronic device 12, mounting brackets 18 having a L-shaped cross section are provided. The mounting bracket 18 is fixed to the side face in such a posture that an L-shaped piece protrudes to the side of the electronic device 12. In one piece projecting sideways, two through holes 18a having substantially the same diameter and the same pitch as the two screw holes 17a provided for each unit section of the rack 13 are formed.

  When the electronic device 12 is accommodated in the rack 13, first, the electronic device 12 is inserted into the rack 13 through the opening 16. Then, the position of the through hole 18a is aligned with the position of the screw hole 17a, and the mounting screw 11 is inserted into the through hole 18a and fastened to the screw hole 17a. Thereby, the electronic device 12 can be attached to the rack 13. Further, the electronic device 12 can be removed from the rack 13 by loosening and removing the mounting screw 11.

  In this example, one electronic device 12 is described as an example, but actually, a plurality of electronic devices 12 are attached to the rack 13 using the screws 11 in the same procedure as described above.

[Schematic structure of mounting screws]
As shown in FIGS. 4 and 5, the mounting screw 11 includes a screw main body 21, an operation unit 22, and an engagement mechanism 23. In the following, for the sake of convenience of explanation, the lower side of the mounting screw 11 shown in FIGS. 4 and 5 will be described as the distal end in the axial direction of the mounting screw 11, and the upper side will be described as the proximal end in the axial direction. The screw main body 21 is formed with a male screw portion 27. The male screw portion 27 is screwed into the screw hole 17 a of the rack 13. The male screw portion 27 has a guide portion 28 provided continuously at the tip in the axial direction. The guide portion 28 has an outer diameter smaller than that of the male screw portion 27. Therefore, the guide part 28 is easy to insert into the screw hole 17a, and guides the male screw part 27 to the screw hole 17a when the mounting screw 11 is fastened to the screw hole 17a.

  A head portion 29 is connected to the male screw portion 27 on the proximal end side in the axial direction. The head 29 has a larger outer diameter than the male screw portion 27. A tooth row 31 is formed on the top surface of the head 29 along the outer peripheral edge. The tooth row 31 constitutes an engagement mechanism 23 together with a groove row 36 of the operation unit 22 described later, and one of the tooth row 31 and the groove row 36 corresponds to an engaging portion and the other corresponds to an engaged portion. As shown in FIG. 5, the head 29 is formed with a screw hole 29 a that is drilled in the axial direction of the screw body 21.

  The operation unit 22 includes an operation unit main body 32 and a handle unit 33. The operation portion main body 32 is formed in a substantially cylindrical shape having a through hole 32a (see FIG. 6) in the center. On the proximal end side of the through hole 32a, a spring accommodating portion 32b having an inner diameter larger than that of the through hole 32a is formed. The spring 24 is stored in the spring storage portion 32b.

[Engagement mechanism]
The engagement mechanism 23 includes a spring 24 and a connecting member 26 in addition to the tooth row 31 and the groove row 36. The engagement mechanism 23 holds the operation unit 22 so as to be slidable in the axial direction between the engagement position and the release position. The engagement position is a position where the rotational force of the operation unit 22 can be transmitted to the screw main body 21 by engaging the head portion 29 and the operation unit 22. In this example, this engagement is performed by the tooth row 31 and the groove row 36. The release position is a position at which the engagement between the head 29 and the operation unit 22 is released by sliding the operation unit 22 in the axial direction from the engagement position. Furthermore, the engagement mechanism 23 holds the operation unit 22 so as to be rotatable about the axis independently of the screw body 21 at the release position.

  As shown in FIGS. 5 and 6, the connecting member 26 includes a male screw portion 26 a, a cylindrical portion 26 b, and a retaining portion 26 c that are connected in order from the distal end side to the proximal end side. The connecting member 26 is attached to the screw main body 21 when the male screw portion 26 a is screwed into the screw hole 29 a of the screw main body 21. The spring 24 is, for example, a coil spring, and the cylindrical portion 26 b is inserted through the spring 24. In a state where the connecting member 26 is attached to the screw main body 21, the spring 24 is disposed on the outer periphery of the cylindrical portion 26b. The diameter of the spring accommodating part 32b is larger than the diameter of the spring 24, and the cylindrical part 26b with the spring 24 attached is inserted into the spring accommodating part 32b.

  At a position corresponding to the edge of the through hole 32a of the spring accommodating portion 32b, a contact portion 32c that contacts the distal end side of the spring 24 is provided. Further, the base end side of the spring 24 is in contact with the retaining portion 26 c of the connecting member 26. Thus, the spring 24 is attached in a state where both ends thereof are in contact with the contact portion 32c and the retaining portion 26c and are compressed in the axial direction. Thereby, the spring 24 exerts an urging force in a direction extending in the axial direction. Since the connecting member 26 is screwed to the screw main body 21, the position of the retaining portion 26c is fixed. For this reason, the urging force of the spring 24 acts in a direction in which the operating portion main body 32 is pressed toward the head 29 of the screw main body 21 on the distal end side via the contact portion 32c.

  In the operation portion main body 32, the proximal end side of the spring storage portion 32b is a large diameter portion 32e having an inner diameter larger than that of the spring storage portion 32b, and a retaining portion 26c of the connecting member 26 is accommodated in this portion. Is done. The retaining portion 26c has a substantially disc shape. A stepped portion between the spring housing portion 32b and the large diameter portion 32e becomes an abutting surface 32d. When the operating portion main body 32 is slid to the proximal end side against the bias of the spring 24, the retaining portion 26c abuts against the abutting surface 32d. Thereby, the further slide to the base end side of the operation part main body 32 is controlled, and it is prevented that the operation part main body 32 falls out.

  In this manner, the operation portion main body 32 can slide in the axial direction by the length of the large diameter portion 32e in the axial direction against the bias of the spring 24. In the engagement mechanism 23, a position pressed against the head 29 by the urging force of the spring 24 is an engagement position between the operation unit 22 and the head 29. This engagement position is the initial position of the operation unit 22. The position where the operation unit 22 is slid by a predetermined amount in the axial direction from the engagement position toward the base end against the bias of the spring 24 is released from the engagement between the operation unit 22 and the head 29. It becomes the release position.

  As shown in FIG. 7, the tooth row 31 provided on the top surface of the head 29 is composed of a plurality of teeth 31a. The plurality of teeth 31 a have a rectangular parallelepiped shape that is formed radially from the radial center of the screw body 21 and protrudes in the axial direction of the screw body 21. The teeth 31 a are arranged at equiangular intervals around the axis of the screw body 21. In the present embodiment, since the tooth row 31 is composed of eight teeth 31a, the angular interval α is 45 °. The shape and angular interval of the teeth 31a are not limited to those described above, and can be changed as appropriate according to the dimensions of the screw body 21 and the number of teeth 31a. For example, the cross-sectional shape in the direction orthogonal to the axial direction of the teeth 31a may not be a rectangle, and may be, for example, a triangle or a sector.

  As shown in FIG. 8, a groove row 36 that engages with the tooth row 31 is formed on the end face on the distal end side of the operation portion main body 32. The groove row 36 includes a plurality of grooves 36a. The plurality of grooves 36 a are formed in a cuboid shape that is formed radially from the radial center of the screw body 21 and protrudes in the axial direction of the screw body 21. The grooves 36a are arranged around the axis of the screw body 21 at the same equiangular intervals as the teeth 31a. The groove row 36 is a groove row that meshes with the tooth row 31, and the number and angular interval of the grooves 36 a correspond to the tooth row 31. In this example, the number of the grooves 36a is 8 corresponding to the number of the tooth rows 31 described above, and the angular interval α is 45 °. The shape and size of each groove 36a are also formed corresponding to the shape and size of the tooth 31a, and the cross-sectional shape of the tooth 31a is rectangular. Therefore, the shape of the groove 36a is also rectangular with the same size. .

  4 and 6, when the groove row 36 and the tooth row 31 are engaged, and the operation unit 22 slides in the axial direction from the engagement position toward the proximal end side, the groove row 36 and the tooth row are engaged. It moves to the release position where the engagement with the row 31 is released. In the engaged position, the groove row 36 and the tooth row 31 are engaged. Therefore, when the operation unit 22 is manually rotated around the axis, the rotational force is passed through the groove row 36 and the tooth row 31 via a screw. It is transmitted to the main body 21. On the other hand, in the release position, even if the operating portion 22 is rotated, the groove row 36 and the tooth row 31 are not engaged, so the rotational force of the operating portion 22 is not transmitted to the screw body 21, and the operating portion 22 is It idles with respect to the screw body 21. The angular position of the operation unit 22 can be changed using this idle rotation.

[Handle]
The handle part 33 is grasped by a hand. The handle portion 33 has a U shape, and the width of the screw main body 21 in the radial direction is larger than that of the operation portion main body 32. The handle portion 33 is attached to the operation portion main body 32 in such a posture that both end portions which are U-shaped open ends sandwich the operation portion main body 32 therebetween. By making the width of the handle portion 33 larger than the diameter of the screw main body 21, an operator can apply a large rotational force to the mounting screw 11 by hand, and the mounting screw 11 can be manually tightened.

  The handle portion 33 is disposed on the proximal end side opposite to the groove row 36 in the axial direction of the operation portion main body 32. The operation portion main body 32 of the handle portion 33 is attached via the connecting pin 34. The connecting pin 34 is arranged so that the longitudinal direction is along the orthogonal axis direction orthogonal to the axial direction of the screw body 21. Therefore, the handle portion 33 is attached to the operation portion main body 32 so as to be rotatable around an orthogonal axis that is a rotation axis of the connecting pin 34. The handle portion 33 has an unfolded position (a position indicated by a solid line in FIG. 4) protruding in the axial direction from the operation portion main body 32 and a storage position (a position indicated by a two-dot chain line in FIG. 4) protruding in the radial direction of the screw body 21. It is displaced between. The unfolding position is an operation position at which the handle portion 33 is gripped in order to apply a rotational force by hand. The handle portion 33 can be folded by rotating from the developed position toward the storage position around the orthogonal axis. Since the handle portion 33 is rotated by 45 ° or more from the deployed position protruding in the axial direction to the storage position, the amount of protrusion in the axial direction from the operation portion main body 32 is zero when the handle portion 33 is folded to the storage position. Become.

[Changing the angular position of the operation unit with respect to the screw body]
As shown in FIG. 9A, in the initial state of the attachment screw 11, the operation portion 22 is in the engagement position, and the groove row 36 and the tooth row 31 are engaged. When changing the angular position of the operation unit 22 with respect to the screw main body 21, the operation unit 22 is first moved from the engagement position shown in FIG. 9A against the bias of the spring 24 to the release position shown in FIG. 9B. Slide towards. By this slide, the engagement between the groove row 36 and the tooth row 31 is released. In the release position, the operation portion 22 can be idled with respect to the screw body 21 by releasing the engagement between the groove row 36 and the tooth row 31.

  When the operation unit 22 is idled with respect to the screw main body 21 in the release position (the state illustrated in FIG. 9B), the angular position of the operation unit 22 with respect to the screw main body 21 is changed (the state illustrated in FIG. 9C). In the present embodiment, since the teeth 31a of the tooth row 31 are arranged at 45 ° intervals, the angular position of the operation unit 22 can be changed every 45 °. Note that between the state shown in FIG. 9B and the state shown in FIG. 9C, when viewed from the operation unit 22 side, the angular position of the operation unit 22 is changed 45 ° counterclockwise. When the hand is released from the operation unit 22, the operation unit 22 slides toward the engagement position by the bias of the spring 24, and the groove row 36 engages with the tooth row 31 (state shown in FIG. 9D).

[Attaching electronic devices to the rack]
Hereinafter, the operation of the above configuration will be described. When mounting the electronic device 12 to the rack 13 using the mounting screw 11, the operator first inserts the electronic device 12 into the rack 13 through the opening 16 as shown in FIG. The position of the through hole 18a is aligned with the position. Next, as shown in FIG. 11, the male screw portion 27 of the mounting screw 11 is inserted into the through hole 18a while maintaining the state where the position of the through hole 18a is aligned with the position of the screw hole 17a. Conclude. As described above, when the operation unit 22 is in the engaged position, the rotational force from the operation unit 22 can be transmitted to the screw body 21. Therefore, if the operation unit 22 is rotated, the screw body 21 is also rotated in the same direction. In addition, since the operation unit 22 is provided with a handle portion 33 having a large radial width with respect to the operation unit main body 32, it is easy to apply a rotational force to the operation unit 22 by hand operation, and easy hand tightening. It can be carried out.

  After the fastening of the mounting screw 11 to the rack 13 is completed, the amount of protrusion of the mounting screw 11 to the front side of the rack 13 can be reduced by folding the handle portion 33 from the deployed position to the storage position. On the other hand, depending on the angular position of the operation unit 22, the handle unit 33 may protrude outside the unit section of the rack 13. In the example of FIGS. 12 and 13A, the lower mounting screw 11 of the two mounting screws 11 has the handle portion 33 within the unit compartment, while the upper mounting screw 11 has the upper end of the handle portion 33. The part protrudes outside the unit section of the rack 13.

  If the handle portion 33 protrudes outside the unit section of the rack 13, it may cause a catch or it is not preferable in appearance. Further, depending on the size and shape of the rack 13 and the electronic device 12, the protrusion of the handle portion 33 to the outside of the unit section may cause the attachment of other electronic devices 12. In such a case, the angular position of the operation unit 22 is changed in order to eliminate the protrusion of the handle unit 33.

  When changing the angular position of the operation unit 22 with respect to the screw body 21, first, the operation unit 22 is slid from the engagement position, which is the initial position, toward the release position against the bias of the spring 24, and then the groove row. 36 and the tooth row 31 are disengaged (state shown in FIG. 13B).

  In the release position (the state shown in FIG. 13B), the rotational force of the operation unit 22 is not transmitted to the screw main body 21. Therefore, when the operation unit 22 is rotated, the operation unit 22 idles with respect to the screw main body 21 (FIG. 13C state). Thereby, the angular position of the operation part 22 with respect to the screw main body 21 can be changed. Between the state shown in FIG. 13B and the state shown in FIG. 13C, the angular position of the operation unit 22 is changed by 90 °. As a result, the upper mounting screw 11 from which the handle portion 33 protrudes from the unit section can be set in the same posture as the lower mounting screw 11 with respect to the angular position of the handle portion 33, and the handle section 33 outside the unit section The overhang is eliminated.

  Such a change in the angular position of the operation unit 22 with respect to the screw main body 21 is very simple because an excessive rotational force is unnecessary as compared with the conventional screw described in Patent Document 1.

  When the hand is released from the operation unit 22, the operation unit 22 slides to the engagement position by the bias of the spring 24, and the groove row 36 is engaged with the tooth row 31. Further, when the handle portion 33 is folded to the storage position (the state shown in FIGS. 13D and 14), the protrusion of the handle portion 33 to the front side of the rack 13 can be suppressed. In the state shown in FIG. 13D and FIG. 14, for the attachment screw 11 fastened to the upper screw hole 17 a, the handle portion 33 is folded downward and the attachment screw 11 fastened to the lower screw hole 17 a is The handle portion 33 is folded upward. By doing so, the two mounting screws 11 are both contained in the unit compartment.

  As described above, the attachment screw 11 can be fastened manually without using a tool, and the angle position of the operation unit 22 can be easily changed after the fastening is completed. As a result, it is possible to easily prevent the mounting screws 11 that have been fastened from protruding outside the unit section of the rack 13 and to easily improve the appearance of the appearance.

  In addition, the change in the angular position of the operation unit 22 may be effective not only after the completion of the fastening but also during the fastening. For example, when the operator wants to apply a large rotational force to the mounting screw 11 while the mounting screw 11 is fastened, the posture of the handle portion 33 is to be changed to an appropriate posture according to the position of the worker and the direction of the hand. There is a case. Even in such a case, if the operation part 22 is slid to the release position side, the operation part 22 can be idled with respect to the screw main body 21, so that it is easy to ensure an appropriate posture of the handle part 33.

"Modification"
(Modified example in which the thread is a female thread)
The screw part formed in the screw main body 21 is not limited to the male screw part, but may be a female screw part 41 as shown in FIG. In this case, for example, the rack is provided with a plurality of male screw portions 42 at a predetermined pitch for each unit section. The electronic device 12 can be attached to the rack by fastening the screw portion 41 to the male screw portion 42.

(Handle displacement method)
In the above example, the handle portion 33 has been described as being provided so as to be rotatable around an orthogonal axis orthogonal to the axial direction of the screw body 21, but it is not simply rotated, but a complicated combination of linear movement and rotational movement. The handle 33 may be displaced by rotation and folded from the deployed position to the storage position. Further, as shown in FIG. 4, the example in which the angle range in which the handle portion 33 rotates from the deployed position to the storage position is 90 ° has been described, but of course, it may be rotated by 90 ° or more.

(Modification example in which the handle part is formed integrally with the operation part)
In the above example, the handle portion that is displaced between the deployed position and the storage position is provided. However, as shown in FIG. 16, the handle portion 43 that is formed integrally with the operation portion main body 32 is used as the operation portion. 22 may be provided. In this case, the handle portion 43 protrudes in the axial direction from the upper end of the operation portion main body 32. Thereby, it is easy for an operator to hold the handle portion 43 and the hand tightening operation can be performed.

  In the case of the handle portion 43 shown in FIG. 16, unlike the handle portion 33 of the above example, the diameter of the handle portion 43 is the same as the diameter of the operation portion main body 32. For this reason, it is unlikely that the handle portion 43 protrudes from the unit section of the rack 13 regardless of the angular position. However, as described above, the configuration in which the angle position of the operation unit 22 is changed with respect to the screw main body 21 is not only an effect of preventing the handle portion 43 from protruding outside the unit section after the completion of the fastening, but also works during the fastening. This is effective even when the angle position of the operation unit 22 is changed to a posture that is easy to do. Therefore, the present invention is effective even when the handle portion 43 is relatively small as shown in FIG.

  Moreover, although the example of using the screw of the present invention as the mounting screw for mounting the electronic device to the rack is shown, the mounting target of the screw of the present invention is not limited to the electronic device, and may be other devices. Screws can also be used when equipment is attached to the floor or wall in addition to the rack. Furthermore, you may utilize not only for attachment of an apparatus but for the fastening which fastens components, such as a pillar and a metal fitting.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention, for example, a combination of the above-described embodiment and modified examples.

11 Screw 12 Electronic device 13 Rack 16 Opening 17 Side plate 17a Screw hole 18 Mounting bracket 18a Through hole 19 Width 21 Screw body 22 Operation part 23 Engaging mechanism 24 Spring 26 Connecting member 26a Male thread part 26b Column part 26c Retaining part 27 Male Screw portion 28 Guide portion 29 Head portion 29a Screw hole 31 Tooth row 31a Tooth 32 Operation portion main body 32a Through hole 32b Spring storage portion 32c Abutting portion 32d Surface 33 Handle portion 34 Connecting pin 36 Groove row 36a Groove 41 Female screw portion 42 Male Screw part 43 Handle part α Angle interval

Claims (8)

A screw main body having a head on the base end side opposite to the tip in the axial direction of the screw portion;
An operation unit arranged on the head and for manually rotating the screw body around an axis;
An engagement mechanism for releasably engaging the head and the operation unit;
The engagement mechanism is
By engaging the head portion with the operation portion, an engagement position where the rotational force of the operation portion can be transmitted to the screw body, and the operation portion is slid in the axial direction from the engagement position. The operation unit is slidably held between the head and the release position for releasing the engagement between the operation unit, and the operation unit is independent of the screw body at the release position. Screw that holds around the axis.   The screw according to claim 1, wherein the engagement mechanism includes a spring that biases the operation portion toward the engagement position.   The screw according to claim 2, wherein an engaging portion is provided on one of the operation portion and the head, and an engaged portion that engages with the engaging portion is provided on the other. One of the engaging part and the engaged part is a dentition arranged with a plurality of teeth arranged at equiangular intervals around the axis and protruding in the axial direction,
The screw according to claim 3, wherein the other is a groove row that meshes with the tooth row at the engagement position. The operation unit is
An operation portion main body formed with the engagement portion;
A handle portion provided on the operation portion main body and gripped by the hand;
A handle portion that is disposed on the opposite side of the engaging portion in the axial direction and that is foldable by rotating around an orthogonal axis orthogonal to the axial direction from a deployment position that protrudes in the axial direction from the operation portion main body; The screw according to claim 3 or 4.   The screw according to claim 5, wherein the handle portion is U-shaped, and both end portions serving as open ends of the U-shape are attached to the operation portion main body in a posture of sandwiching the operation portion main body.   The screw according to claim 5 or 6, wherein, in the folded state of the handle portion, the protruding amount in the axial direction from the operation portion main body is zero.   The screw according to any one of claims 1 to 7, wherein the screw main body has a guide portion having an outer diameter smaller than that of the screw portion at a tip of the screw portion opposite to the head portion in the axial direction. .

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