JPH0571428U - Screw drop prevention device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The present invention relates to a device for preventing the falling of screws for mounting panels, etc., which facilitates removal of the mounted screws and has a smaller diameter than resin washers. The purpose is to reduce the diameter of the bush for the pedestal and to reduce the diameter. A bush for a pedestal having a screw 10, a panel 20 or the like having a hole through which the screw 10 is inserted, and a through hole 31 which is mounted on a rear surface side of a portion of a hole 21 of the panel 20 or the like and which is orthogonal to an axis line on a side portion. 30 and a neck portion 12 of the screw 10 fitted into the pedestal bush 30 and inserted into the pedestal bush 30.
And a fall prevention member 40 in which the insertion / extraction shaft portion 42 projects from the through hole 31 provided in the side portion of the pedestal bush 30. The fall prevention member 40 has a substantially C shape. It has a stopper portion 41 and a shaft portion 42 for insertion / removal connected to the stopper portion 41, and the gap between the openings 41a of the substantially C-shaped locking portion 41 is smaller than that of the neck portion 12 of the screw 10. The extraction hole 43 of the member 40 is provided with the extraction hole 43.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw fall prevention device for mounting a panel or the like.

[0002]

[Prior Art]

 For example, as shown in FIG. 5, a panel 1 having various indications on its surface is attached by screws 3 to a control panel or control box 2 for various instruments and the like.

In order to easily handle the panel 1, the screw 3 is attached to the panel 1 in advance and the screw 3 is prevented from dropping. Conventionally, as this type of screw fall prevention device, for example, as shown in FIGS. 6 to 8, a screw 3 having a screw portion 3a, a neck portion 3b and a head portion 3c and a hole 1a through which the screw 3 is inserted are provided. Panel 1 having the above, a pedestal bush 4 mounted on the back surface side of the hole 1a of the panel 1, and a neck portion 3b of a screw 3 inserted into the pedestal bush 4 and inserted into the pedestal bush 4 And a resin-made washer 5 that locks.

Then, the pedestal bush 4 is provided with a hole 4 a communicating with the hole 1 a of the panel 1. Further, the resin washer 5 has a disc shape, and a hole 5a having a diameter smaller than that of the neck portion 3b of the screw 3 is provided in the center portion. Then, three tongue pieces 5c are formed at the edge of the hole 5a by the three notches 5b.

Such a screw drop prevention device is, for example, as shown in FIG. 6, a resin washer 5 is pushed into a recess 4b of a pedestal bush 4 mounted on the panel 1 by a pushing tool 6, and the panel 1 is pushed. It is formed by press-fitting the screw 3 from the front surface side in the direction of the pedestal bush 4 through the holes 1a and 4a.

At this time, when the threaded portion 3a of the screw 3 comes into contact with the hole 5a of the resin washer 5, the three tongue pieces 5c are bent toward the pushing tool 6 in the hole 5a, and the threaded portion of the screw 3 is screwed. Allow insertion of 3a. Then, when the threaded portion 3a of the screw 3 passes, the three tongue pieces 5c try to restore due to their elasticity and stick to the neck portion 3b of the screw 3.

According to the screw fall prevention device thus configured, as shown in FIG. 8, since the resin washer 5 is attached to the neck portion 3b of the screw 3, when the panel 1 is turned upside down, The screw 3 tries to drop by its own weight, but the screw 3a of the screw 3 does not come into contact with the resin washer 5 and fall out.

[0008]

[Problems to be solved by the device]

 However, in such a conventional screw fall prevention device, the resin washer 5 arranged in the pedestal bush 4 is used to prevent the screw 3 from falling off. It is difficult to remove the screw 3 when the screw 3 is removed due to replacement of the screw, damage to the screw 3, replacement due to incorrect designation of the screw, or the like.

In particular, since the resin washer 5 is located in the recess 4b of the pedestal bush 5 as shown in FIG. 8, it is forcibly pulled out by applying a large force to break the resin washer 5.

Therefore, in order to attach the screw 3 again, a new resin washer 5 must be prepared and the method shown in FIG. 6 must be used, which is very time-consuming. Moreover, the resin washer 5 is provided with a plurality of (three in this example) notches 5b and tongues 5c so that the hole diameter can be flexibly deformed so that the resin washer 5 can be inserted from the screw portion 3a side. Etc. must be given.

Further, in the resin washer 5, the distance between the bottom portion of the cut 5b and the outer peripheral portion 5d needs to be 1 mm or more in view of the strength of the resin. Therefore, there is a problem that the outer diameter of the resin washer 5 becomes large, and the diameter of the pedestal bush 5 into which the resin washer is loosely fitted becomes large.

When the diameter of the pedestal bush 5 is increased in this way, the mounting space of the control panel and the control box 2 of various instruments to which the pedestal 5 is attached becomes large, and the installation space of the accommodated devices and the like is increased. Will be restricted.

The present invention has been made in order to solve such a conventional problem, and an object thereof is to make it easy to remove the attached screw and to make the diameter smaller than that of the resin washer and to make the base stand. Another object of the present invention is to provide a screw drop prevention device that enables the bush for a small diameter to be used.

[0014]

[Means for Solving the Problems]

 According to a first aspect of the present invention, a screw having a screw portion, a neck portion, and a head portion, a panel having a hole for inserting the screw, and the like are mounted on the back surface side of the hole portion of the panel and the like, and the side portion directly intersects the axis line. The pedestal bush provided with a through hole and the neck portion of the screw that is inserted into the pedestal bush and inserted into the pedestal bush are locked, and the shaft part for insertion and removal is inserted through the through hole provided on the side of the pedestal bush. Is provided with a fall prevention member, and the fall prevention member has a substantially C-shaped locking portion and an insertion / removal shaft portion that is connected to the locking portion, and has a substantially C-shaped locking portion. The space between the openings is smaller than the neck of the screw.

According to a second aspect of the present invention, the pull-out hole is provided in the pull-out shaft of the fall prevention member.

[0016]

[Action]

 In claim 1, after the screw is inserted from the front surface side of the panel, the through hole of the pedestal bush in which the fall prevention member is attached to the panel first with the opening of the locking portion that is substantially C-shaped While being inserted, the opening of the substantially C-shaped locking portion is spread by the neck portion of the screw, and the neck portion of the screw is fitted into the substantially C-shaped locking portion.

As a result, the neck portion of the screw is locked by the fall prevention member and is prevented from falling off the panel. Also, when the pull-out shaft part of the fall prevention member that protrudes from the through hole of the pedestal bush is pulled, the opening of the locking part that is approximately C-shaped is pushed open by the neck part of the screw to form approximately C-shaped. The locking part separates from the neck of the screw and can be pulled out.

According to the second aspect of the present invention, when the extraction tool is inserted into the extraction hole and pulled, the opening of the locking portion having a substantially C shape is widened by the neck portion of the screw to form a substantially C shape. The stop is separated from the neck of the screw and can be pulled out.

[0019]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of a screw fall prevention device according to the present invention, in which 10 represents a screw.

The screw 10 has a screw portion 11, a neck portion 12 and a head portion 13. The panel 20 to which the screw 10 is attached is provided with holes 21 for mounting a predetermined number of screws 10, as in FIG. 5, for example.

The pedestal bush 30 mounted on the back side of each hole 21 of the panel 20 is provided with a through hole 31 on its side portion which is orthogonal to the axis. The through hole 31 is set to be larger than the maximum distance by which the locking portion 41 having a substantially C-shape of the fall prevention member 40, which will be described later, can be expanded when the screw 10 is engaged with the neck portion 12 of the screw 10.

The pedestal bush 30 has a hole 32 communicating with the hole 21 of the panel 20 and a recess 33 into which the screw 10 is loosely fitted. The fall prevention member 40 fitted in the through hole 31 of the pedestal bush 30 has a substantially C-shaped locking portion 41 and an insertion / removal shaft portion 42 connected to the locking portion 41, and has a substantially C-shaped shape. The distance A between the openings 41a of the locking portion 41 is smaller than that of the neck 12 of the screw 10.

The drop prevention member 40 has a length such that the insertion / extraction shaft portion 42 projects from the side portion of the pedestal bush 30 when fitted into the through hole 31 of the pedestal bush 30. Further, a pull-out hole 43 is provided in the pull-out shaft portion 42 of the fall prevention member 40.

Next, the operation of this embodiment thus constructed will be described. First, the screw 10 is inserted from the front surface side of the panel 20 through the hole 21 of the panel 20 and the hole 32 of the pedestal bush 30.

Next, the fall prevention member 40 is inserted into the through hole 31 of the pedestal bush 30 mounted on the panel 20 first with the opening 41 a of the substantially C-shaped locking portion 41. At this time, the opening portion 41a of the locking portion 41 having a substantially C-shape is spread by the neck portion 12 of the screw 10, and the neck portion 12 of the screw 10 is fitted into the substantially C-shaped locking portion 41. ..

According to the screw fall prevention device thus constructed, as shown in FIG. 3, since the fall prevention member 40 is attached to the neck portion 12 of the screw 10, when the panel 20 is turned upside down, Although the screw 10 tries to fall by its own weight, the screw portion 11 of the screw 10 does not come into contact with the fall prevention member 40 and fall out.

When the screw 10 is to be removed due to, for example, replacement of the panel 20 due to scratches on the panel 20, damage of the screw 10, replacement due to incorrect screw designation, etc., as shown in FIG. When a desired device is hooked in the pull-out hole 43 provided in the pull-out shaft portion 42 of the member 40 and pulled in the direction of the arrow, the opening 41a of the locking portion 41 having a substantially C-shape becomes the neck portion 12 of the screw 10. Is pushed out and the substantially C-shaped locking portion 41 is disengaged from the neck portion 12 of the screw 10.

Therefore, the screw 10 can be easily taken out from the panel 20 even after mounting. Further, the fall prevention member 40 has elasticity and can be reused as long as the locking portion 41 is not deformed.

Further, when the fall prevention member 40 is formed of a metal leaf spring, the width of the locking portion 41 can be sufficiently used only by making it about 1.5 mm larger than the outer diameter of the neck portion 12 of the screw 10. Wear.

Therefore, the outer shape of the locking portion 41 can be made much smaller than that of the conventional resin washer. Therefore, the outer diameter of the pedestal bush 30 that accommodates the fall prevention member 40 can be made smaller than before.

In the above embodiment, the case where the pull-out shaft portion 42 of the fall prevention member 40 is provided with the pull-out hole 43 has been described, but the pull-out hole 43 is not provided and the pull-out shaft portion 42 is gripped. It can also be removed by holding and pulling.

Further, the through hole 31 provided in the side portion of the pedestal bush 30 has a shape penetrating the side portion as shown in FIG. 4, but it may be one penetrating the side portion and the concave portion.

[0033]

[Effect of the device]

 As described above, according to the first aspect of the present invention, the drop prevention member is inserted into the through hole of the pedestal bush mounted on the panel first while the opening of the locking portion having the substantially C shape is inserted into the through hole of the pedestal bush. Since the opening of the letter-shaped locking part is expanded by the screw neck and the neck of the screw is inserted into the substantially C-shaped locking part, even after the screw is attached, the fall prevention member can be inserted and removed. When the shaft portion is pulled, the opening portion of the substantially C-shaped locking portion is spread by the screw neck portion, and the substantially C-shaped locking portion is separated from the screw neck portion and can be pulled out.

Further, since the fall prevention member can be downsized as compared with the conventional resin washer, the pedestal bush can be downsized. Therefore, it is possible to widen the space for accommodating control panels and control boxes for various instruments and the like.

According to the second aspect, the fall prevention member can be easily pulled out by inserting the pulling tool into the pulling hole and pulling it.

[Brief description of drawings]

FIG. 1 is an exploded cross-sectional view of a screw drop prevention device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a fall prevention member in FIG.

FIG. 3 is a sectional view of a screw fall prevention device according to an embodiment of the present invention.

FIG. 4 is a sectional view showing a main part of FIG.

FIG. 5 is a perspective view showing an example of a panel with screws.

FIG. 6 is an exploded cross-sectional view of a conventional screw drop prevention device.

7 is a plan view of the resin washer in FIG.

FIG. 8 is a cross-sectional view of a conventional screw drop prevention device.

[Explanation of symbols]

 10 screw 11 screw part 12 neck part 13 head part 20 panel 21 hole 30 pedestal bush 31 through hole 32 hole 40 fall prevention member 41 locking part 41a opening 42 insertion / extraction shaft part 43 extraction hole

Claims (2)

[Scope of utility model registration request] 1. A screw having a screw portion, a neck portion, and a head portion,
A panel or the like having a hole for inserting the screw, a pedestal bush provided on the back side of the hole portion of the panel or the like and provided with a through hole orthogonal to the axis line on the side, and fitted into the pedestal bush. The fall prevention member is provided with a fall prevention member that locks the neck portion of the screw inserted into the pedestal bush and projects the insertion / extraction shaft portion from the through hole provided in the side portion of the pedestal bush. A screw drop characterized by having a C-shaped locking portion and an extraction / insertion shaft portion that is connected to the locking portion, and the gap between the openings of the substantially C-shaped locking portion is smaller than the screw neck portion. Prevention device. 2. The drop-preventing member has a shaft for removing and inserting,
The screw drop prevention device according to claim 1, wherein a pull-out hole is provided.