JP2004340323A - Screw fall preventing structure and fastening member and device having screw fall preventing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that in removing a screw, the screw is fallen in a ceiling structure or a device installed on the wall surface where in attaching and detaching a screw fastening member, a screw is fallen and a device placed below is damaged by the fallen screw or the screw itself is lost. <P>SOLUTION: As for a screw 8 having the fear of falling due to loosening, the edge of a screw passing hole for passing the screw 8 is provided with a projecting part 11 for allowing advance and retreat of the screw 8 and regulating the screw head 12 of the screw 8 from being pulled out. The projecting part is composed of four support legs 13, and two opposite legs are provided with an elastically deformed claw 14 for preventing the screw head from being pulled out, and the screw 8 is pointed to the screw fastening direction and stored in four support legs 13 using the elastic deformation of the claws 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a screw drop prevention structure for preventing a screw that is screwed down to a part that may fall by loosening the screw, a fastening component having the screw drop prevention structure, and a device.
[0002]
[Prior art]
Many devices, including electrical devices, have fasteners that are fastened with screws and can be removed. Among them, there is a ventilation device which is installed on a ceiling structure or a wall surface of a building and has connection terminals covered with a screw-tightened cover (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 6-5545
[Problems to be solved by the invention]
In the above-mentioned conventional ventilation devices and other devices, in devices installed on a ceiling structure or a wall surface, screws are dropped when attaching and detaching fastening parts, and the dropped objects may be damaged by the dropped screws, or screws may be removed. The win was accompanied by annoying problems, such as being lost.
[0005]
The present invention has been made in order to solve such a conventional problem, and an object thereof is to obtain a screw drop prevention structure in which a screw does not drop when a screw is removed. The purpose is to develop fastening parts and equipment with a screw fall prevention structure.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a screw that is likely to fall by loosening, and allows the screw to advance and retreat at a hole edge of a screw insertion hole through which the screw is inserted. In this case, a means for providing a protruding portion for controlling withdrawal is adopted. Thus, whether the screw is tightened or loosened, the screw is guided by the protruding portion, and the screw does not have to be held. The loosened screw does not fall because the screw head is restricted from being pulled out by the protrusion.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a perspective view showing the entirety of the ventilation device according to the present embodiment, and FIG. 2 is a bottom view showing the ventilation device excluding its grill. The ventilator 1 is attached to a ceiling structure with a suction port 2 facing downward in a room. The inlet 2 is provided with a detachable grill 3 along the ceiling surface. At one corner of the main body box 5 containing the blower 4, a connection terminal 6 is housed and attached in a terminal box 7 made of resin. The terminal box 7 is covered with a resin cover 9 whose open lower surface can be disengaged by screws 8. A power cord is connected to the connection terminal 6 after installation.
[0008]
At a hole edge of the screw insertion hole 10 through which the screw 8 of the cover 9 is inserted, a protrusion 11 in which the screw 8 is housed in the screw tightening direction over substantially the entire length thereof is integrally formed with the cover 9 as a screw drop prevention structure. . The projecting portion 11 is constituted by four support legs 13 surrounding the outer diameter of the screw head 12. The four support legs 13 are shifted by 90 degrees from each other, and have sufficient rigidity to hold the screw 8. The two opposing support legs 13 stand at the same thickness from the base to the tip at intervals substantially equal to the outer diameter of the screw head 12, as shown in FIG.
[0009]
The other two opposing bolts also stand at an interval substantially equal to the outer diameter of the screw head 12, but at the tip thereof, a claw 14 projecting into the outer diameter of the screw head 12 as shown in FIG. It is formed inward. The claw 14 is configured such that the inner end of the outer surface is formed with an inward slope, and is relatively easily elastically deformed. In assembling the ventilation device 1, when the screw 8 is inserted from the screw portion into the support leg 13 and the screw head 12 is pushed in, the claw 14 is elastically deformed inward to allow the screw head 12 to pass therethrough. It can be easily stored in the four support legs 13. Further, since the support leg 13 is formed integrally with the cover 9 as a fastening component, the screw drop prevention structure does not fall off.
[0010]
When connecting the power cord to the connection terminal 6, it is necessary to loosen the screw 8 from the terminal box 7 to remove the cover 9, which is a fastening component, but it is also possible to loosen the screw 8 screwed into the terminal box 7. The screw 8 is guided by the four support legs 13 and retreats, and does not need to be held, can be removed from the terminal box 7, and does not drop. Even when the cover 9 is mounted, the screw 8 held in the screwing direction by the support leg 13 may be directly screwed into the screw head 12 with a tool, and the cover 9 can be easily attached and detached.
[0011]
The screw drop prevention structure may be a cylindrical projection 11 divided in the circumferential direction as shown in a plan view in FIG.
[0012]
This screw fall prevention structure includes a screw of a power cord connecting portion of a lighting device 15 attached to a ceiling or a wall as shown in FIG. 6, or a wall as shown in FIG. The present invention can also be applied to the mounting type switch box 16. Further, the present invention can be applied to a screw 8 for mounting a vent cap 17 which is a ventilation terminal component mounted on a wall surface as shown in FIG.
[0013]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the screw fall prevention structure which is easy to remove | detach a screw | thread and does not fall down at the time of screw removal / removal is obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a ventilation device according to an embodiment.
FIG. 2 is a bottom view of the ventilation device according to the embodiment.
FIG. 3 is an enlarged cross-sectional view taken along line AA in FIG. 2 showing the screw fall prevention structure of the embodiment.
FIG. 4 is an enlarged cross-sectional view taken along line BB in FIG. 2 showing the screw fall prevention structure of the embodiment.
FIG. 5 is a plan view showing another screw drop prevention structure according to the embodiment.
FIG. 6 is an exploded perspective view showing a lighting device to which a screw fall prevention structure can be applied.
FIG. 7 is a perspective view showing a switch box to which a screw fall prevention structure can be applied.
FIG. 8 is a perspective view showing a vent cap to which a screw fall prevention structure can be applied.
[Explanation of symbols]
1 ventilator, 7 terminal box, 8 screw, 9 cover, 10 screw insertion hole, 11 protrusion, 12 screw head, 13 support leg, 14 nail.

Claims (7)

A projecting portion that allows the screw to advance and retreat at the edge of the screw insertion hole through which the screw is inserted for the screw that may drop when loosened, and restricts the screw head from being pulled out. Screw drop prevention structure provided with The screw fall prevention structure according to claim 1, wherein the projecting portion is constituted by a plurality of support legs surrounding the periphery of the screw. 3. The screw fall prevention structure according to claim 2, wherein four support legs are provided at positions shifted from each other by approximately 90 degrees, and a claw covering a screw head is provided on the top of the two support legs facing each other. Screw drop prevention structure with a protruding configuration. The screw fall prevention structure according to any one of claims 1 to 3, wherein the protrusion has an elastically deformable structure, and a screw is fitted into the protrusion by elastic deformation, or a screw is inserted from the protrusion. Screw drop prevention structure that can be removed. The screw fall prevention structure according to any one of claims 1 to 4, wherein the protrusion is integrally formed with a component having a screw insertion hole by using a synthetic resin. A fastening component comprising the screw fall prevention structure according to claim 5. An apparatus comprising the fastening part according to claim 6.

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