JP7117668B2 - screw - Google Patents

Description

The present invention relates to screws.

A screw that can be tightened by hand without using a tool such as a screwdriver is known (see Patent Documents 1 and 2 below). Such a screw includes a screw body and an operation portion that is gripped and operated by an operator. In the screw described in Patent Document 1, torque releasing means using a spring is provided between the shaft (screw body) and the head (operation portion) supported on the upper end of the shaft. In the screw described in Patent Document 1, the torque releasing means prevents the screw from being over-tightened by allowing the head to idle with respect to the shaft when a predetermined or more rotational force is applied to the head. .

On the other hand, in the mounting screw described in Patent Literature 2, the operating portion can be folded by rotating around an axis perpendicular to the axial direction of the screw. Accordingly, after the screw is tightened, the operating portion can be folded to reduce the amount of protrusion in the axial direction.

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

The inventors are considering using such a screw that can be tightened by hand as a screw for fixing an electronic device to a rack when the electronic device is to be accommodated in the rack, for example. As a rack, for example, there is a vertical rack that can accommodate a plurality of electronic devices arranged in a vertical direction. The rack is provided with a plurality of slot-shaped unitary sections for accommodating a plurality of electronic devices, and one electronic device is accommodated in each unitary section. Each electronic device is fixed to the position of each unitary compartment by screws.

The plurality of electronic devices are, for example, components of electrical equipment for broadcasting or communication. In such electrical equipment, there are cases where the electronic equipment is frequently attached to and removed from the rack due to reasons such as maintenance of the electronic equipment, which is a constituent item, and changes in the equipment configuration. Therefore, if a screw that can be tightened by hand is used to fix 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 above-described racks. First, in the screw described in Patent Document 1, the operation portion of the screw has an ear shape and is formed relatively large so that it can be easily gripped by hand. Protruding. When an electronic device is fixed to a rack, it is often the case that both ends in the width direction of the electronic device are fastened with screws from the front side. In this case, if the size of the operation portion of the screw is large, the operation portion protrudes outside the unitary division of the rack. If the amount of protrusion is large, it may cause catching and is not preferable in terms of appearance.

In the screw described in Patent Literature 1, the operating portion idles with respect to the shaft portion when a predetermined torque or more is applied to the operating portion during fastening. Therefore, depending on the angular position of the operating portion when fastening is completed, the amount of protrusion of the rack outside the unit compartment may be reduced. However, in the screw described in Patent Literature 1, the angular position of the operation portion when fastening is completed cannot be freely controlled. Further, even if it is possible to change the angular position of the operation part by applying a predetermined torque or more to cause the operation part to idle after the fastening is completed, it is not easy because a large force is required for that purpose. .

Further, like the screw described in Patent Document 1, the screw described in Patent Document 2 also has a relatively large operating portion so that it can be easily tightened by hand. The operating portion is provided at a deployment position protruding in the axial direction of the screw, and foldable by rotating from the deployment position around an orthogonal axis perpendicular to the axial direction. By folding the operating portion, the amount of protrusion of the screw in the axial direction can be reduced.

However, with the screw described in Patent Document 2, as with the screw described in Patent Document 1, it is not possible to freely control the angular position of the operation portion when fastening is completed. The amount of protrusion of the rack outside the unitary domain may become large.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a screw that can be tightened by hand, in which the angular position of an operating portion can be easily changed after completion of fastening.

In order to achieve the above object, the screw of the present invention includes a screw body, an operating portion, and an engaging mechanism. The screw body is formed with a threaded portion and has a head on the proximal end side opposite to the distal end in the axial direction of the threaded portion. The operation part is arranged on the head and is for manually rotating the screw body around the axis. The engagement mechanism releasably engages the head and the operation part. The engagement mechanism engages the head portion with the operation portion to engage an engagement position where the rotational force of the operation portion can be transmitted to the screw body, and slides the operation portion in the axial direction from the engagement position. The operation part is slidably held between a release position where the engagement between the head and the operation part is released, and at the release position, the operation part is held rotatably around an axis independently of the screw body. .

The engagement mechanism preferably has a spring that biases the operating portion toward the engagement position.

It is preferable that one of the operating portion and the head is provided with an engaging portion, and the other is provided with an engaged portion that engages with the engaging portion.

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

It is preferable that the operating portion includes an operating portion main body and a handle portion. An engaging portion is formed in the operating portion main body. The handle portion is provided on the operation portion main body, is a handle portion that is gripped by hand, is arranged on the opposite side of the engaging portion in the axial direction, and extends axially from the unfolded position protruding from the operation portion main body in the axial direction. It can be folded by rotating around orthogonal axes.

It is preferable that the handle portion has a U shape and is attached to the operation portion main body in such a manner that the open ends of the U shape sandwich the operation portion main body.

It is preferable that the handle portion has no axial protrusion from the main body of the operation portion in the folded state.

It is preferable that the screw body has a guide portion having an outer diameter smaller than that of the threaded portion at the tip of the threaded portion on the side opposite to the head portion in the axial direction.

According to the present invention, in a screw that can be tightened by hand, it is possible to easily change the angular position of the operating portion after completion of fastening.

1 is an external perspective view of a rack to which electronic equipment is attached by screws of the present invention; FIG. 1 is a front view of a rack to which electronic equipment is attached; FIG. FIG. 3 is a perspective view showing screws, electronics, and a rack; FIG. 3 is a perspective view of a screw; It is an exploded perspective view of a screw. FIG. 4 is a cross-sectional view of the screw with the operating portion in the engaged position; It is a top view of a screw main body. It is a bottom view of an operation part. It is a perspective view of a cross-sectional view of the screw with the operating portion in the engaged position. It is a perspective view of a cross-sectional view of the screw with the operation portion in the release position. FIG. 10 is a perspective view of a cross-sectional view of the screw in which the angular position of the operating portion is changed after the operating portion is set to the release position; FIG. 10 is a perspective view of a cross-sectional view of the screw with the operating part in the engaged position after changing the angular position of the operating part; 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 process of fastening a screw to a screw hole. FIG. 4 is a partially enlarged view showing a state in which a screw fastened to a screw hole protrudes from a unitary section of the electronic device; FIG. 11 is a side view of the periphery of a screw protruding from the unitary compartment of the electronic device when fastened to the screw hole; FIG. 10 is a side view of the periphery of the screw with the operating portion set to the release position after fastening to the screw hole; FIG. 10 is a side view of the periphery of the screw in which the angular position of the operating portion is changed after the operating portion is set to the release position; FIG. 10 is a side view of the periphery of the screw with the operating portion set to the engaging position after the angular position of the operating portion is changed; FIG. 4 is a partially enlarged view of a state in which the handle portion is folded and the screw is accommodated in the unitary compartment of the electronic device; It is a bottom side perspective view of the screw of the modification which made the screw part the female screw. FIG. 11 is a perspective view of a modified screw in which a handle portion is integrally formed with an operation portion;

[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. Mounting screws 11 are used, for example, to mount electronic equipment 12 to 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, an amplifier, and the like. 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, for example, a 19-inch rack complying with EIA standards. The 19-inch rack has standardized dimensions, has a unit section of 19 inches (about 482.6 mm) in width and 1.75 inches (44.45 mm) in height, and can accommodate electronic devices 12 arranged vertically. It is a vertical rack. The rack 13 has a box shape with an opening 16 on the front side, and side plates 17 arranged on both sides of the opening 16 have a plurality of screw holes 17a on the front surface thereof at a predetermined pitch for each unit section. It is In this embodiment, two screw holes 17a are drilled for each unitary section.

As shown in FIG. 3, the electronic device 12 has a substantially rectangular parallelepiped external shape that fits within a 19-inch rack unit section of 19 inches wide and 1.75 inches high. Mounting brackets 18 each having an L-shaped cross section are provided on both sides of the electronic device 12 . The mounting bracket 18 is fixed to the side surface of the electronic device 12 with one L-shaped piece protruding to the side of the electronic device 12 . Two through holes 18a having substantially the same diameter and the same pitch as the two screw holes 17a provided in each unit section of the rack 13 are formed in one piece protruding sideways.

When housing the electronic device 12 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 .

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

[Schematic configuration of mounting screws]
As shown in FIGS. 4 and 5, the mounting screw 11 includes a screw body 21, an operating portion 22, and an engaging mechanism 23. As shown in FIGS. Hereinafter, for 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 as the proximal end in the axial direction. A male screw portion 27 is formed on the screw body 21 . The male screw portion 27 is screwed into the screw hole 17 a of the rack 13 . The male threaded portion 27 is connected to a guide portion 28 at the tip in the axial direction. The guide portion 28 has a smaller outer diameter than the male screw portion 27 . Therefore, the guide portion 28 can be easily inserted into the screw hole 17a, and guides the male screw portion 27 into the screw hole 17a when fastening the mounting screw 11 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 threaded portion 27 . A row of teeth 31 is formed on the top surface of the head 29 along the outer peripheral edge. The tooth row 31 constitutes the engaging mechanism 23 together with a groove row 36 of the operating portion 22, which will be described later. One of the tooth row 31 and the groove row 36 corresponds to the engaging portion and the other corresponds to the engaged portion. As shown in FIG. 5, the head 29 is formed with a screw hole 29a that is bored in the axial direction of the screw body 21. As shown in FIG.

The operating portion 22 includes an operating portion main body 32 and a handle portion 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. A spring accommodating portion 32b having an inner diameter larger than that of the through hole 32a is formed on the base end side of the through hole 32a. The spring 24 is accommodated in the spring accommodating 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 groove row 36 . The engagement mechanism 23 holds the operating portion 22 axially slidably between the engagement position and the release position. The engaging position is a position where the rotational force of the operating portion 22 can be transmitted to the screw main body 21 by engaging the head portion 29 and the operating portion 22 . In this example, this engagement is provided by the tooth row 31 and the groove row 36 . The release position is a position where the engagement between the head 29 and the operation portion 22 is released by sliding the operation portion 22 in the axial direction from the engagement position. Furthermore, the engagement mechanism 23 holds the operation part 22 rotatably around the axis independently of the screw body 21 at the release position.

As shown in FIGS. 5 and 6, the connecting member 26 has a male threaded portion 26a, a columnar portion 26b, and a retainer portion 26c, which are successively arranged from the distal end side to the proximal end side. The connecting member 26 is attached to the screw body 21 by screwing the male screw portion 26 a into the screw hole 29 a of the screw body 21 . The spring 24 is, for example, a coil spring, and the cylindrical portion 26b is inserted through the spring 24 . When the connecting member 26 is attached to the screw body 21, the spring 24 is arranged on the outer periphery of the cylindrical portion 26b. The diameter of the spring accommodating portion 32b is larger than the diameter of the spring 24, and the cylindrical portion 26b with the spring 24 attached thereto is inserted through the spring accommodating portion 32b.

A contact portion 32c that contacts the tip side of the spring 24 is provided at a position corresponding to the edge of the through hole 32a of the spring housing portion 32b. Also, the base end side of the spring 24 abuts on the retaining portion 26 c of the connecting member 26 . In this way, the spring 24 is attached in a state in which both ends are in contact with the contact portion 32c and the retainer portion 26c and are compressed in the axial direction. As a result, the spring 24 exerts an urging force in the axially extending direction. Since the connecting member 26 is screwed to the screw body 21, the position of the retaining portion 26c is fixed. Therefore, the biasing force of the spring 24 acts in a direction to press the operating portion main body 32 toward the head portion 29 of the screw main body 21 on the distal end side thereof via the contact portion 32c.

In the operating portion main body 32, the base end side of the spring housing portion 32b is a large diameter portion 32e having an inner diameter larger than that of the spring housing portion 32b. be done. The retaining portion 26c has a substantially disk shape. A stepped portion between the spring accommodating portion 32b and the large diameter portion 32e serves as an abutment surface 32d. When the operation portion main body 32 is slid toward the base end against the bias of the spring 24, the retaining portion 26c abuts against the abutment surface 32d. As a result, further sliding of the operation portion main body 32 to the proximal end side is restricted, and the operation portion main body 32 is prevented from falling off.

In this manner, the operation portion main body 32 can slide in the axial direction against the bias of the spring 24 by the axial length of the large diameter portion 32e. The position where the engagement mechanism 23 is pressed against the head 29 by the biasing force of the spring 24 is the engagement position between the operating portion 22 and the head 29 . This engagement position is the initial position of the operating portion 22 . The engagement between the operating portion 22 and the head portion 29 is released at a position where the operating portion 22 is axially slid by a predetermined amount toward the base end side from the engaging position against the bias of the spring 24 . 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 are formed in a rectangular parallelepiped shape radially from the center of the screw body 21 in the radial direction and protrude in the axial direction of the screw body 21 . Each tooth 31 a is arranged at equal angular intervals around the axis of the screw body 21 . In this embodiment, since the tooth row 31 is composed of eight teeth 31a, the angular interval α=45°. The shape and angular interval of the teeth 31a are not limited to those described above, and may be changed as appropriate according to the dimensions of the screw body 21, the number of teeth 31a, and the like. For example, the cross-sectional shape of the tooth 31a in the direction perpendicular to the axial direction may not be rectangular, and may be triangular or fan-shaped.

As shown in FIG. 8 , a groove row 36 that engages with the tooth row 31 is formed on the end face of the operation portion main body 32 on the distal end side. The groove row 36 is composed of a plurality of grooves 36a. The plurality of grooves 36a are formed radially from the center of the screw body 21 in the radial direction and have a rectangular parallelepiped shape protruding 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 angular 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 intervals of the grooves 36 a correspond to the tooth row 31 . In this example, the number of grooves 36a is eight, corresponding to the number of tooth rows 31 and the like, 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 since the cross-sectional shape of the tooth 31a is rectangular, the shape of the groove 36a is also rectangular with the same size. .

4 and 6, the groove row 36 and the tooth row 31 are engaged with each other, and when the operating portion 22 slides axially from the engagement position toward the proximal end side, the groove row 36 and the tooth row are engaged. It moves to a release position where it disengages from row 31 . At the engaging position, the groove row 36 and the tooth row 31 are engaged with each other, so that when the operating portion 22 is manually rotated around the axis, the rotational force is applied to the screw through the groove row 36 and the tooth row 31. It is transmitted to the main body 21 . On the other hand, even if the operation portion 22 is rotated at the release position, the groove row 36 and the tooth row 31 are not engaged with each other. It idles with respect to the screw body 21 . This idle rotation can be used to change the angular position of the operation unit 22 .

[Handle part]
The handle portion 33 is held by hand. The handle portion 33 is U-shaped, and the radial width of the screw body 21 is formed to be larger than that of the operation portion body 32 . The handle portion 33 is attached to the operating portion main body 32 in such a manner that the operating portion main body 32 is sandwiched between the U-shaped open end portions. By making the width of the handle portion 33 larger than the diameter of the screw body 21, the 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 arranged on the base end side opposite to the groove row 36 in the axial direction of the operation portion main body 32 . Attachment of the operation portion main body 32 to the handle portion 33 is performed via a connecting pin 34 . The connecting pin 34 is arranged such that its longitudinal direction is along the orthogonal axial 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 the orthogonal axis, which is the rotation axis of the connecting pin 34 . The handle portion 33 has an unfolded position (the position indicated by the solid line in FIG. 4) in which the handle portion 33 protrudes in the axial direction from the operation portion main body 32, and a retracted position (the position indicated by the two-dot chain line in FIG. 4) in which the screw body 21 protrudes in the radial direction. is displaced between The deployed position is an operating position where the handle portion 33 is gripped to apply a rotational force by hand. The handle portion 33 can be folded by rotating from the unfolded position toward the retracted position about the orthogonal axis. Since the handle portion 33 rotates by 45° or more from the unfolded position protruding in the axial direction to the retracted position, when the handle portion 33 is folded to the retracted position, the amount of axial protrusion from the operation portion main body 32 is zero. Become.

[Changing the angular position of the operation part with respect to the screw body]
As shown in FIG. 9A, in the initial state of the mounting screw 11, the operating portion 22 is in the engaging position, and the groove row 36 and the tooth row 31 are engaged. When changing the angular position of the operation part 22 with respect to the screw body 21, first, the operation part 22 is moved from the engagement position shown in FIG. 9A to the release position shown in FIG. 9B against the bias of the spring 24. slide towards. This slide releases the engagement between the groove row 36 and the tooth row 31 . At the release position, the engagement between the groove row 36 and the tooth row 31 is released, so that the operating portion 22 can be idly rotated with respect to the screw body 21 .

When the operating portion 22 is idly rotated with respect to the screw body 21 at the release position (the state shown in FIG. 9B), the angular position of the operating portion 22 with respect to the screw body 21 is changed (the state shown in FIG. 9C). In the present embodiment, since the teeth 31a of the tooth row 31 are arranged at intervals of 45°, the angular position of the operating portion 22 can be changed every 45°. 9B to the state shown in FIG. 9C, the angular position of the operation unit 22 is changed counterclockwise by 45° when viewed from the operation unit 22 side. Then, when the operating portion 22 is released, the force of the spring 24 causes the operating portion 22 to slide toward the engagement position, and the groove row 36 engages with the tooth row 31 (state shown in FIG. 9D).

[Mounting electronic equipment on the rack]
The operation of the above configuration will be described below. When the electronic equipment 12 is to be attached to the rack 13 using the mounting screws 11, the operator first inserts the electronic equipment 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, while maintaining the position of the through hole 18a aligned with the position of the screw hole 17a, the male threaded portion 27 of the mounting screw 11 is inserted into the through hole 18a and into the screw hole 17a. conclude. As described above, when the operating portion 22 is in the engaged position, it is possible to transmit the rotational force from the operating portion 22 to the screw body 21 . Therefore, when the operating portion 22 is rotated, the screw body 21 is also rotated in the same direction. Further, since the operation portion 22 is provided with the handle portion 33 having a large width in the radial direction with respect to the operation portion main body 32, it is easy to apply a rotational force to the operation portion 22 by manual operation, which facilitates manual tightening. It can be carried out.

After the fastening of the mounting screws 11 to the rack 13 is completed, the amount of protrusion of the mounting screws 11 toward the front side of the rack 13 can be reduced by folding the handle portion 33 from the unfolded position to the retracted position. On the other hand, depending on the angular position of the operating portion 22, the handle portion 33 may protrude outside the unitary division of the rack 13. FIG. In the example of FIGS. 12 and 13A, the lower mounting screw 11 of the two mounting screws 11 has the handle portion 33 contained within the unitary compartment, while the upper mounting screw 11 has the upper end of the handle portion 33 part protrudes outside the unitary division of the rack 13.

If the handle portion 33 protrudes outside the unitary division of the rack 13, it may cause catching and is undesirable in terms of appearance. Moreover, depending on the size and shape of the rack 13 and the electronic device 12, the protrusion of the handle portion 33 outside the unitary division may hinder the attachment of other electronic devices 12. FIG. In such a case, the angular position of the operating portion 22 is changed in order to eliminate protrusion of the handle portion 33 .

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

In the released position (the state shown in FIG. 13B ), since the rotational force of the operation part 22 is not transmitted to the screw body 21 , when the operation part 22 is rotated, the operation part 22 idles with respect to the screw body 21 (see FIG. 13B ). 13C). 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 operating portion 22 is changed by 90°. As a result, the handle portion 33 of the upper mounting screw 11, the handle portion 33 of which protrudes from the unitary division, can be set to the same angular position as the lower mounting screw 11, and the handle portion 33 is positioned outside the unitary division. The protrusion to is eliminated.

Changing the angular position of the operating portion 22 with respect to the screw main body 21 in this manner is very simple, as it does not require an excessive rotational force, compared to the conventional screw described in Japanese Unexamined Patent Application Publication No. 2002-200012.

Then, when the operating portion 22 is released, the operating portion 22 slides to the engagement position due to the force of the spring 24 and the groove row 36 engages 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 FIGS. 13D and 14, the handle portion 33 is folded downward for the mounting screw 11 fastened to the upper screw hole 17a, and the mounting screw 11 fastened to the lower screw hole 17a is The handle portion 33 is folded upward. By doing so, both of the two mounting screws 11 are housed within the unitary compartment.

As described above, the mounting screw 11 can be tightened by hand without using a tool, and the angular position of the operation portion 22 can be easily changed after the completion of tightening. As a result, it is possible to easily prevent the tightened mounting screw 11 from protruding outside the unitary section of the rack 13, and it is also possible to easily improve the external appearance.

Further, the change in the angular position of the operating portion 22 may be effective not only after completion of fastening but also during fastening. For example, when the worker wants to apply a large rotational force to the mounting screw 11 while the mounting screw 11 is being tightened, it is desired to change the posture of the handle portion 33 to an appropriate posture according to the worker's position and hand orientation. Sometimes. Even in such a case, if the operation portion 22 is slid to the release position side, the operation portion 22 can be idly rotated with respect to the screw body 21, so that the proper posture of the handle portion 33 can be easily secured.

"Variation"
(Modified example in which the threaded part is female threaded)
The threaded portion formed on the screw body 21 is not limited to a male threaded portion, and may be a female threaded portion 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. By fastening the threaded portion 41 to the male threaded portion 42, the electronic device 12 can be attached to the rack.

(Displacement method of handle)
In the above example, the handle portion 33 is provided rotatably about an orthogonal axis that is perpendicular to the axial direction of the screw body 21. However, rather than simply rotating the handle portion 33, a complex combination of linear movement and rotational movement has been described. The handle portion 33 may be displaced by rotation so that it can be folded from the unfolded position to the stowed position. Further, as shown in FIG. 4, an example in which the angle range in which the handle portion 33 rotates from the deployed position to the retracted position is 90° has been described, but of course, the handle portion 33 may be rotated by 90° or more.

(Modified example in which the handle portion is formed integrally with the operation portion)
In addition, in the above example, a handle portion that is displaceable between the deployed position and the retracted position is provided. However, as shown in FIG. 22 may be provided. In this case, the handle portion 43 axially protrudes from the upper end of the operation portion main body 32 . As a result, the operator can easily grip the handle portion 43 and perform manual tightening work.

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 . Therefore, it is unlikely that the handle portion 43 protrudes from the unitary section of the rack 13 at any angular position. However, as described above, the configuration for changing the angular position of the operation portion 22 with respect to the screw body 21 not only has the effect of preventing the handle portion 43 from protruding out of the unit section after the completion of fastening, but also has the effect of preventing work during fastening. The effect is exhibited even when the angular position of the operation unit 22 is changed to a posture that is easy to operate. Therefore, the present invention is effective even when the handle portion 43 is relatively small as shown in FIG.

Moreover, although the screw of the present invention is used as a mounting screw for mounting an electronic device on a rack, 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 to attach devices to floors and walls in addition to racks. Furthermore, it may be used not only for mounting equipment, but also for fastening parts such as pillars and metal fittings.

The present invention is not limited to the above-described embodiments, and can be appropriately modified, for example, by combining the above-described embodiments and modifications without departing from the scope of the present invention.

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 screw part 26b Cylindrical 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 Contact portion 32d Surface 33 Handle portion 34 Connecting pin 36 Groove row 36a Groove 41 Female screw portion 42 Male Threaded portion 43 Handle portion α Angle interval

Claims (4)

a screw body having a head on the base end side opposite to the distal end in the axial direction of the threaded part, and a screw body arranged on the head and manually operated to rotate the screw body around the axis. and an engaging mechanism for releasably engaging the head and the operating portion,
The engagement mechanism is
By engaging the head and the operation portion, an 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 portion can be slid between a release position for releasing the engagement between the head and the operation portion, and the operation portion can be slid independently of the screw body at the release position. is rotatable around an axis, and further comprises a spring that biases the operation part toward the engagement position,
An engaging portion is provided on one of the operating portion and the head, and an engaged portion that engages with the engaging portion is provided on the other;
The operation unit is
an operation portion main body in which the engaging portion is formed;
A handle portion provided on the operation portion main body and held by the hand,
A handle portion that is arranged on the opposite side of the engaging portion in the axial direction and that can be folded by rotating around an orthogonal axis perpendicular to the axial direction from a deployed position protruding from the operating portion main body in the axial direction. with
The handle portion has a U-shape, and is attached to the operation portion main body in such a manner that both ends that are open ends of the U-shape sandwich the operation portion main body.
A screw characterized by: one of the engaging portion and the engaged portion is a tooth row composed of a plurality of teeth arranged at equal angular intervals around the axis and protruding in the axial direction;
2. The screw according to claim 1, wherein the other is a groove row that meshes with the tooth row in the engagement position. 3. The screw according to claim 1 or 2 , wherein, in a folded state, the handle portion has a projection amount of zero in the axial direction from the main body of the operation portion. 4. The screw according to any one of claims 1 to 3 , wherein the screw body has a guide portion having an outer diameter smaller than that of the threaded portion at the tip of the threaded portion opposite to the head portion in the axial direction. .

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