JPH0154566B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a screw holding device, which is easy to manufacture and assemble, and has an expanded range of applications.

[Technical background of the invention]

Screws such as bolts and nuts are used to tighten and fix objects, but when used in places where one object is immovable and relatively large and the other object will be replaced, screws are used. Alternatively, bolts are often fixed to immovable objects.

There are screws shown in FIGS. 8 and 9 that are used in this type of location.

That is, the screw holding device shown in FIGS. 8 and 9 is a device that is embedded in a concrete flat plate that becomes the ceiling plate 11, for example, in order to suspend a chandelier inside a building. The open-bottom electrical box 12 has a back insert 13 in its bottom wall 121. A screw 14 can be screwed into the insert 13 from the opening side of the electrical box 12. Inside the electric box 14,
Electric wires are routed through conduits buried in concrete slabs. Here, a metal fitting for suspending the chandelier is locked to the screw 14, while an electric wire is connected to a connector of the chandelier.

FIG. 9 shows a device that uses studs 15 to hang lighting equipment such as a chandelier. The stud 15 has locking pins 152, 1 on the board 151.
52 and a cylindrical screw 15, the locking pin 15
2,152 and the cylindrical screw 153 are connected to the electric box 1.
Holes 123, 123, formed in the bottom wall 121 of 2
124 from outside the box. and,
The stud 15 and the electric box 12 are integrated by screwing the nut 16 onto the cylindrical screw 153 from inside the electric box 12.
This device is also attached to a ceiling panel, for example. Then, the support rod of the lighting device is screwed onto the cylindrical screw 153 to hold the lighting device.

[Problems with background technology]

According to the conventional screw holding device described above, in order to integrate the electric box and the screw holder, it is necessary to place parts on the back and front of the bottom wall of the box and work from both sides. For this reason, there are problems in that workability is poor and parts often fall off during work. Furthermore, although the inserts, studs, and other parts are made of metal, they have enough strength to suspend a member of about 1 ton. On the other hand, the weight of lighting equipment used in general households is limited to 20 to 30 kg, except for special ones, and the above-mentioned conventional products are of excessive quality and are also expensive. Furthermore, if it is attempted to change the diameter of the screw hole of the insert or the screw hole of the stud, it is necessary to redesign the mold, which is disadvantageous in terms of cost.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and has good assembly workability, allows the use of screw parts to be easily changed to various sizes, and
It is an object of the present invention to provide a screw holding device which can use commercially available bolts and nuts, has a small quantity, and can be implemented at low cost.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an exploded sectional view thereof, and FIG. 3 is an exploded perspective view thereof. Reference numeral 21 denotes a parts storage part, and this parts storage part 21 has an opening side and a bottom wall, and an external attachment part 22 is integrally formed on this bottom wall 21a. The external mounting portion 22 has a hollow space communicating with the component storage portion 21, and the tip portion 22a is formed to be gradually thicker than the base portion. The component storage section 21 is formed to be thicker than the outer circumference of the external attachment section 22. Further, the external mounting portion 22 is formed with a slotted portion 22b so that the tip portion 22a can expand outward when, for example, a cylindrical wedge component 23 is inserted into the hollow thereof.
The wedge part 23 (shown in FIG. 2) has a hollow space and is inserted into the hollow part of the external attachment part 22 from the part storage part 21 side. In this case, the wedge component 23 is
1, and the external mounting portion 22a.
A locking portion 23b that locks at the tip of is also integrally formed.

Next, a nut 25, for example, is inserted into the component storage portion 21 as a screw component. This nut 25
is arranged such that its screw hole is coaxial with the hollow of the wedge part 23.

Next, a holding part 26 is inserted into the parts storage part 21 to press the nut 25 toward the bottom wall 21a. This holding part 26 has a locking effect between the nut 25 and the parts storage part 21, and
5. Prevents lifting. This presser part 26
is integrally formed with a locking portion 26a protruding from its outer periphery, and this portion is connected to the component storage portion 21.
can be engaged with a protrusion 21b integrally formed on the inner circumferential wall of.

The component storage portion 21, wedge component 23, presser component 26, etc. are, for example, synthetic resin molded products.

According to the above-described apparatus of the present invention, when the apparatus is attached to the open portion 30a of the substrate 30, the operation can be carried out partially from one side of the substrate 30. The substrate 30 may be, for example, the bottom wall of an electrical box.

This invention is not limited to the above embodiments, but can be realized in various embodiments.

FIG. 4 shows an example of a means for locking the nut 25 and the component storage portion 21. Figure 4A shows the parts storage section 21.
A locking portion 21c is integrally formed on the inner circumferential wall of the holder, and a nut 25 is locked to the locking portion 21c.

Further, in FIG. 4B, the nut 25 can be locked in the parts storage part 21 via the wedge part 23. That is, since the wedge part 23 is locked to the tip of the external attachment part 22 by the locking part 23b, the locking piece 23c is attached to the wedge part 23 itself.
The nut 25 may be held by forming a hole. In this case, the nut accommodating space of the wedge component 23 is preferably formed into a shape that matches the outer peripheral shape of the nut 25.

In the above embodiment, the nut 25 and the wedge part 2
Although 3 is shown as a separate body, a thread may be cut in the hollow part of the head of the wedge part 23, and in this case, the nut can be omitted.

In the device of the present invention, when the specifications of threaded parts are changed, the purpose can be easily achieved simply by using a simple spacer, without the need to newly manufacture each part. Therefore, the parts storage section 21, the external mounting section 22,
The wedge parts 23 can be mass-produced and manufactured at low cost, and the screw parts can be commercially available inexpensive ones, so the overall price is low.

FIG. 5 shows an example of the spacer described above. The first spacer 41 has approximately the same diameter as the hexagonal nut 25 described above, and is locked and held within the component storage portion 21 . Inside this first spacer 41, a second spacer 42 also shaped like a hexagonal ring can be inserted, and a nut 43 can be inserted into this. In this case, the first
The spacer 41 includes a second spacer 42 and a nut 43.
In order to prevent the nut 43 from slipping out upwards, the nut 43 is formed to be closed, for example, in the shape of a cap, or a hole approximately the same diameter as the screw hole of the nut 43 is formed in this portion. Thus, by using the spacer means, the present device can be implemented without any problem even if the size of the threaded part is changed.

The device of this invention utilizes screw parts to
It can be used for various purposes such as hanging objects from the 0 side or supporting objects.

FIG. 6 shows an example in which the apparatus is applied to an electric box 51 embedded in a ceiling plate 50 of a concrete panel, and the apparatus of the present invention is attached to the electric box 51 before concrete is poured into the formwork. In this way, for example, a lighting fixture such as a chandelier is suspended below the buried electrical box 51, and for example, a bolt 5 is used to hold it.
2 is screwed onto the nut 25 from below.

FIG. 7 shows an example in which the apparatus of the present invention is used, for example, when it is desired to install a support rod 55 on a floorboard 56 of an electrical device or the like. According to this device, since the installation work can be carried out from only one side of the floorboard 56, it is convenient to use it as a mounting part when it is desired to attach accessories after the assembly of electrical equipment is completed.

In the above embodiment, the external mounting portion 22 inserted into the hole of the board 30 and the wedge component 23 inserted therein are shown as having circular outer peripheries.
The shape is not limited to this, but may be polygonal. In this case, rotation of the component storage portion is prevented when attaching the bolt. Furthermore, in the above description, an example was shown in which the nut was held in the parts storage part, but the head of the bolt may also be held.

〔Effect of the invention〕

As described above, the present invention can provide a screw holding device that has good assembly workability, allows the sizes of screw parts to be freely changed, and can be implemented at a low cost.

[Brief explanation of drawings]

1, 2, and 3 are an assembled cross-sectional view, an exploded cross-sectional view, and an exploded perspective view of one embodiment of the present invention, and FIG. 4 is a cross-sectional view showing another embodiment of the present invention, and FIG. The figure is an explanatory diagram of a spacer according to the present invention,
FIGS. 6 and 7 are cross-sectional views showing examples of use of the device of the present invention, and FIGS. 8 and 9 are illustrations of the configuration of conventional screw component holding devices, respectively. 21... Parts storage section, 22... External mounting section, 23...
Wedge parts, 25...nuts, 26...presser parts, 3
0...Substrate.

Claims (1)

[Scope of Claims] 1. An external mounting part that is hollow and has a slot and whose tip part is thicker than the base part; a parts storage part integrally molded with the external mounting part; A wedge part that expands; a threaded part that is inserted into the parts storage part and has a threaded part coaxially aligned with the hollow part of the wedge part; and a locking means that locks the threaded part to the parts storage part. A screw holding device characterized by: 2. The screw holding device according to claim 1, wherein the threaded portion is a nut. 3. The screw holding device according to claim 1, wherein the threaded portion is a nut having a threaded portion inserted into a wedge component and whose head is positioned in the component storage portion. 4. The locking means includes a protrusion formed on the inner circumferential wall of the parts storage section, and a holding part that is inserted into the parts storage part and presses the nut, having a locking part that locks onto the protrusion. A screw holding device according to claim 1, characterized in that: