JPH09196019A - Prefabricated panel connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a prefabricated panel connecting device, which can reduce the intrusion of the heat insulating material into a wrench insertion hole of a hook device, at the time of manufacturing a prefabricated panel. SOLUTION: A prefabricated panel 2 is provided with a pair of surface materials 31, 32 and the heat insulating material D to be filled with foaming in a space between the surface materials. A prefabricated panel connecting device for connecting both the prefabricated panels is formed of a hook device F and a pin device. This hook device is provided with a hook housing case 6 and a hook provided inside of the hook housing case freely to be turned. One side surface of the hook housing case is formed with a wrench insertion hole 13, in which a wrench for turning the hook is to be inserted, so as to be projected, and communicated with a wrench hole 34 formed in the surface material of the prefabricated panel. On the other hand, the other side surface of the hook housing case is formed with a projecting part 29, which abuts on the surface material of the prefabricated panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated panel joining device incorporated in a prefabricated panel for joining prefabricated panels constituting a prefabricated structure such as a prefabricated refrigerator or a prefabricated freezer.

[0002]

2. Description of the Related Art A coupling device for a prefabricated panel of this type is
It consists of a hook device and a pin device. As a hook device for such a prefabricated panel coupling device, a structure having a structure as shown in FIG. 8 is under study. In FIG. 8, a pair of face materials 01 are opposed to each other with a space, and the end portion of the space between the face materials 01 is connected to the frame member 0.
2 is blocked. A hook device 03 is attached to the frame member 02, and a hook (not shown) is rotatably provided inside the hook device 03. The hook is rotated by a wrench, and a wrench insertion hole 04 into which the wrench is inserted is formed so as to project from one side surface of the hook device 03. In addition, the face material 0 corresponding to the wrench insertion hole 04
A wrench hole 06 is formed in the portion 1. In the space between the face materials 01, a heat insulating material 07 such as urethane
Are filled and foamed to form a prefabricated panel.

[0003]

When producing this prefabricated panel, first of all, the face material 01 in which the wrench hole portion 06 is formed is laid down, and then the face material 01 The frame member 02 is fitted on each side. This frame material 02
The hook device 03 is screwed in advance, and the hook device 03 is assembled so that the wrench insertion hole 04 of the hook device 03 is placed in the wrench hole portion 06 of the face material 01. Then, another face material 01 is fitted on the frame material 02,
After that, a heat insulating material 07 such as urethane is supplied as shown by an arrow in FIG. 8 to be filled and foamed.

At this time, the wrench insertion hole 04 of the hook device 03 and the wrench hole 06 of the face material 01 are caused by the twist of the frame member 02 or a slight deviation between the frame member 02 and the jig. There may be a gap in. Further, when the heat insulating material 07 foams, the heat insulating material 07 swells and the hook device 03 is pushed up (moved to the left side in FIG. 8), and the wrench insertion hole 0
There may be a gap between 4 and the wrench hole 06. When a gap is generated in this way, the heat insulating material 07 may enter the wrench insertion hole 04 through the gap and close the wrench insertion hole 04. Then, it becomes impossible to insert the wrench into the wrench insertion hole 04.
It is necessary to remove the heat insulating material 07 that blocks the wrench insertion hole 04, which is troublesome.

The present invention is intended to solve the above problems, and provides a prefabricated panel coupling device in which the heat insulating material is less likely to enter the wrench insertion hole of the hook device during manufacturing of the prefabricated panel. The purpose is to do.

[0006]

A prefabricated panel (2) provided with a prefabricated panel coupling device of the present invention comprises:
A pair of face members (31, 3) facing each other with a gap.
2) and a heat insulating material (D) that is filled and foamed in the space between the face materials, and is disposed adjacent to another prefabricated panel. Then, the prefabricated panel coupling device for coupling the adjacent prefabricated panels to each other is
It is composed of a hook device (F) and a pin device (P), and the hook device is built in one of the adjacent prefabricated panels, while the pin device engaging with the hook device is the adjacent one. It is built into the other side of the prefabricated panel.

In order to achieve the above object, the hook device of the coupling device for a prefabricated panel according to the present invention comprises a hook storage case (6) and a hook rotatably provided inside the hook storage case. (23) is provided, and a wrench insertion hole (13) into which a wrench for rotating the hook is inserted is formed to project on one side surface of the hook storage case. The wrench insertion hole communicates with the wrench hole (34) formed in one of the pair of face members of the prefabricated panel. On the other hand, on the other side surface that is the surface opposite to the one side surface of the hook storage case, a protrusion (29) that abuts on the other of the pair of face materials of the prefabricated panel is formed.

The other side surface of the hook storage case,
A spacer (51) may be interposed between the prefabricated panel and the other of the pair of face materials.

A wrench hole is formed on one of the pair of face members of the prefabricated panel so as to project inward, and the wrench hole may be fitted in the wrench insertion hole. is there.

Further, the frame member closes the ends of the space between the face members, and the inner peripheral surface of the wrench insertion hole is oval in shape, and the long diameter (L) of the oval is the above-mentioned. There is a case in which a wrench hole having a substantially circular outer periphery is formed so as to project inwardly on one of the pair of face members of the prefabricated panel that is substantially parallel to the extending direction of the frame member.

In the invention described in claim 1 or 2, the wrench hole may be fitted in the wrench insertion hole, but it is not always necessary. The wrench hole may be projected inward, but it does not necessarily have to be projected. In the invention of claim 2, 3 or 4, the protrusion may be formed, but it does not necessarily have to be formed. In the invention of claim 1, 2 or 3, the wrench insertion hole may be oval,
The shape does not necessarily have to be an ellipse, and may be a circle, for example. In the invention according to claim 4,
The part that may come into contact with the wrench hole must be oval. However, the portion that does not come into contact with the wrench hole may have an oval shape, but may have a shape other than the oval shape, such as a circular shape. Therefore, the wrench insertion hole may have an oval shape over the entire axial direction, or may have, for example, only the tip end portion having an oval shape.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a prefabricated panel coupling device according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a prefabricated refrigerator in which the coupling device for prefabricated panels according to the present invention is used. 2A and 2B are explanatory views of the hook storage case, where FIG. 2A is a front view of one side wall of the hook storage case, FIG. 2B is a developed view of the hook storage case, and FIG. 2C is a front view of the other side wall of the hook storage case.
(D) is a side view of (b). FIG. 3 is an enlarged sectional view of a main part of the prefabricated panel. FIG. 4 is an enlarged view of the wrench insertion hole of the hook storage case and the wrench hole of the face material,
(A) is a front view, (b) is a BB sectional view of (a), (c)
Is a cross-sectional view of CC in (a). FIG. 5 is a side view of the hook device attached to the frame member. FIG. 6 is a side view of the hook device coupled to the pin device. Figure 7 is thickness 1
FIG. 9 is a cross-sectional view of a hook device attached to a 00 mm prefabricated panel.

First, a prefabricated refrigerator assembled with a prefabricated panel coupling device will be described with reference to FIG. In FIG. 1, a prefabricated refrigerator 1 that is a prefabricated structure is configured by connecting a plurality of prefabricated panels 2 having heat insulating properties, and a cooling device that cools the inside of the refrigerator is provided inside the prefabricated refrigerator 1. ing. And, an opening is formed on the front surface of the prefabricated refrigerator 1,
A heat insulating door 3 is provided in this opening so as to be openable and closable.

As shown in FIG. 6, adjacent prefabricated panels 2 are connected by a prefabricated panel coupling device composed of a hook device F and a pin device P. The hook housing case 6 of the hook device F shown in FIG. 2 is integrally molded of a synthetic resin material such as ABS resin having elasticity, and one side of the support plates 7 and 8 which are a pair of rectangular side walls is flexible. The structure is such that they are connected by a sex connection part 9. A rotor support hole 12 is formed so as to project on one of the support plates 7, and a wrench insertion hole 13 is provided at the tip of the rotor support hole 12. The other support plate 8
A bearing recess 14 is formed in the shaft. Further, reinforcing ribs 15 are erected on the support plates 7 and 8.

The hook storage case 6 thus constructed is opened as shown in FIG. 2B, and the rotor 21 made of synthetic resin shown in FIGS. 5 and 6 is attached to the hook storage case 6. A metal hook member 23 is rotatably attached to the rotor 21 in advance. Then, after attaching the rotor 21 to the hook storage case 6, the hook storage case 6 is formed with the connecting portion 9 as a fold.
Is bent to form a box shape, and the hook device F is manufactured. In this way, in the assembled state of the hook device F, the eccentric shafts 24 formed so as to project on both side surfaces of the rotor 21 are fitted into the rotor support holes 12 of the support plate 7 and the bearing recesses 14 of the support plate 8. The rotor 21 is rotatably supported by the hook storage case 6. The eccentric shaft 24 has a square wrench engaging hole 2
6 are formed. In addition, as described above, the bearing recess 14 is formed on the inner surface of the support plate 8, and the bearing recess forming portion 28 forming the bearing recess 14 projects to the outside of the support plate 8. . Four ribs 29 as protrusions are formed on the bearing recess forming portion 28 so as to protrude at the same height.

Hook device F assembled in this way
As shown in FIG. 3 and FIG.
It is attached with 0. Then, similarly to the conventional example, the frame member W is attached by being engaged with the end portions of the pair of face members 31 and 32 facing each other with a gap,
A heat insulating material D such as urethane is injected and foamed in the space between the double-sided materials 31 and 32. However, at this time, unlike the conventional example, the tip end of the rib 29 of the hook device F has the face material 32.
Is in contact with In this way, the prefabricated panel 2 is manufactured.

By the way, the wrench insertion hole 1 of the hook device F
A wrench hole 34 is formed by pushing in a position corresponding to the wrench insertion hole 13 in the face material 31 facing the wrench 3.
As shown in FIG. 4, the wrench hole portion 34 is formed by slightly projecting inward from the inner surface of the face material 31,
The inner diameter and the outer diameter of the wrench hole portion 34 are all formed into a substantially circular shape. Then, the wrench insertion hole 13 of the hook device F abuts on the wrench hole 34 in a slightly fitted state. The cross-sectional shape of the inner peripheral surface of the wrench insertion hole 13 is not a perfect circle but an elliptical shape having a major axis L and a minor axis S. The short diameter S is formed to be substantially the same as or slightly larger than the outer diameter of the wrench hole 34. Therefore, when the wrench hole 34 is fitted in the wrench insertion hole 13, as shown in FIG. 4C, the wrench insertion hole 13 and the wrench hole 34 are substantially separated from each other in the direction of the minor axis S. Although they are in close contact with each other, a gap d is formed between the wrench insertion hole 13 and the wrench hole portion 34 on both sides in the direction of the major axis L as shown in FIG. 4B. This gap d is set to about 0.5 mm, and the wrench hole portion 34 has a major axis L of the wrench insertion hole 13.
Even if the gap is unevenly distributed on one side, it will fit within 1 mm at the maximum. Since the heat insulating material D cannot pass through the gap without a gap of at least about 2 mm, the heat insulating material D does not enter through this gap.

In FIG. 2 (b), the major axis L direction of the wrench insertion hole 13 is formed in the longitudinal direction of the hook storage case 6 and is attached to the frame member W shown in FIG. , Is parallel to the extending direction of the frame material W.

The prefabricated panel 2 manufactured in this way
Are connected to adjacent prefabricated panels 2 as shown in FIG. At the time of this connection, the hook member 23 of the hook device F built in the prefabricated panel 2 is rotated from the position of the chain double-dashed line shown in FIG. Pin device P built in 2
Engage with the pin 41 of.

In order to rotate the hook member 23, the wrench engaging hole 2 of the rotor 21 is first shown in FIG.
Insert a wrench into 6 and engage. And with this wrench,
When the rotor 21 is rotated, the bulging portion 4 of the rotor 21
6 abuts and engages with one of the pair of protrusions 48, 49 of the hook member 23. Then, when engaged, the hook member 2
3 rotates together with the rotor 21. Therefore, when the rotor 21 is rotated clockwise, the hook member 23 and the pin 41 are engaged with each other to connect the prefabricated panels 2 to each other, while when the rotor 21 is rotated counterclockwise, the hook member 23 and the pin 41 are connected. The engagement with 41 is released, and the connected prefabricated panels 2 are separated from each other.

By the way, the prefabricated panel 2 shown in FIG. 3 has a thickness of 50 mm, but the prefabricated panel has a thickness of 100 mm.
There are thickness and 150mm thickness. When the thickness is 100 mm, a wide frame member W1 is adopted as shown in FIG. 7 instead of the frame member W shown in FIG. 3, and the bearing recess forming portion 28 of the hook device F is used. Between the surface material 32 and
Spacer 51 made of resin, wood, etc. with heat insulation
Is interposed. One end of the spacer 51 is engaged with and held by the rib 29 of the hook device F, and the other end of the spacer 51 is in contact with the face member 32. Further, in the case of a prefabricated panel having a thickness of 150 mm, a wider range of frame materials are used and a large spacer 51 is adopted.

As described above, in the embodiment, the wrench insertion hole 13 is formed in the support plate 7 which is one side surface of the hook storage case 6, and the wrench of the face material 31 is formed in the wrench insertion hole 13. Since the hole portion 34 is fitted, the wrench insertion hole 13 and the wrench hole portion 34 are less likely to be displaced. Therefore, the positions of the wrench insertion hole 13 and the wrench hole 34 are displaced, and the heat insulating material D can be prevented from entering the wrench insertion hole 13. Also,
Conventionally, the heat insulating material D is sealed with a paper tape so as not to enter the wrench insertion hole 13, but this sealing is unnecessary.

Further, after connecting the prefabricated panels to each other,
A cap is fitted into the wrench insertion hole 13 and the wrench hole 34 in order to improve the appearance. This cap is difficult to fit if the positions of the wrench insertion hole 13 and the wrench hole 34 are misaligned, but in this embodiment, the position is less likely to be misaligned, so avoiding difficult fitting. You can

By the way, there is a case where only one hook device F is attached to the frame member W, but in general, a plurality of hook devices F are provided, and correspondingly, the face member 31 has a plurality of wrenches. The hole 34 is formed. And the hook device F
Although the intervals between them, that is, the pitches, and the pitches of the intervals between the wrench hole portions 34 are manufactured so as to match with each other, a manufacturing error may occur. Then, when the wrench hole 34 is fitted into the wrench insertion hole 13 of the hook device F, if there is no gap between the wrench insertion hole 13 and the wrench hole 34, the pitch of the hook device F and the wrench If the pitch of the hole portions 34 deviates, it becomes difficult to fit the wrench hole portions 34 into the wrench insertion holes 13.

However, in this embodiment, the wrench insertion hole 13 has an elliptical shape whose major axis is the direction in which the frame member W extends, and the play is made in the direction in which the frame member W extends. have. Therefore, even when the pitch of the hook device F and the pitch of the wrench hole portion 34 are deviated, the wrench hole portion 34 can be easily fitted into the wrench insertion hole 13. In addition, the gap generated between the wrench insertion hole 13 and the wrench hole 34 fitted in the wrench insertion hole 13 is about 1 mm at maximum, and is set to a size such that the heat insulating material D cannot enter. On the other hand, since there is no play between the wrench insertion hole 13 and the wrench hole 34 in the direction perpendicular to the direction in which the frame member W extends, the hook device F can be reliably positioned. It is possible to reliably prevent the wrench insertion hole 13 and the wrench hole 34 from being displaced.

On the other hand, a rib 29 is formed on the support plate 8, which is the other side surface of the hook storage case 6, and the rib 29 is formed.
Has a tip abutting on the face material 32. Further, when the prefabricated panel is thick, the spacer 51 is arranged between the rib 29 and the face material 32. Therefore, the rib 29 or the spacer 51 acts as a support member for the face material 32, and the hook storage case 6 is provided on the rib 29 side, that is, the face material 32.
It is possible to prevent the displacement to the side. Like this
Since the hook storage case 6 is not displaced to the face material 32 side, the wrench insertion hole 13 is less likely to rise away from the other face material 31 and move away, and a large gap is generated between the wrench insertion hole 13 and the face material 31. Will be reduced. As a result, the heat insulating material D can be prevented from entering the wrench insertion hole 13.

Moreover, since the rib 29, which is the protruding portion of this embodiment, can hold the spacer 51, the hook device F can be used not only when manufacturing a prefabricated panel having a small thickness, but also when the prefabricated panel has a small thickness. The spacer 51 can be attached to the hook device F and used even when manufacturing a large prefabricated panel. Further, if the hook device F and the spacer 51 are separated during the manufacturing,
Although it is difficult to manufacture, in this embodiment, since the spacer 51 is held by the rib 29 as described above, and the hook device F and the spacer 51 are less likely to be separated from each other, the prefabricated panel can be easily manufactured. Become.

The embodiment of the present invention has been described in detail above.
The present invention is not limited to the above embodiment,
Within the gist of the present invention described in the claims,
Various changes can be made. Modification examples of the present invention are exemplified below. (1) In the embodiment, the ellipse of the wrench insertion hole 13 is set so that the difference between the major axis L and the minor axis S is about 1 mm, but the heat insulating material D cannot almost penetrate. If it is a value, the value of this difference can be changed as appropriate. Although it depends on the property of the heat insulating material D, it may be set to about 2 mm or less, for example. Also, the lower limit of the above difference is the wrench hole 3
Although it depends on the manufacturing accuracy of No. 4 and the mounting accuracy of the hook device F, it is about 0.5 mm.

(2) In the embodiment, four ribs 29 are provided as protrusions, but the number and shape of protrusions can be changed as appropriate. For example, the number of protrusions may be one, or it may be a protrusion having a flat contact surface at the tip such as a columnar shape. Further, it is not always necessary to hold the spacer by the protruding portion. However, it is easier to manufacture a thick prefabricated panel if the spacer can be held by the protruding portion.

(3) In the embodiment, the hook storage case 6 is made of resin, but it may be made of another material such as a metal such as an iron plate. Further, the hook storage case 6 is manufactured by folding one plate in two, but it can be manufactured by another manufacturing method. For example, it is possible to manufacture by joining two plates.

(4) In the embodiment, the rotor 2
1 is provided, the rotor 21 does not necessarily have to be provided, and it is possible to rotate the hook member by directly engaging the wrench with the hook member. (5) In the embodiment, the prefabricated refrigerator is constructed with the prefabricated panel, but it is also possible to construct other prefabricated structures. For example, a prefabricated freezer or the like is also possible. (6) The material of the face material can be appropriately selected, and for example, a coated steel plate, an aluminum plate, a stainless plate, a resin plate or the like can be adopted.

[0032]

According to the present invention, a wrench insertion hole is formed so as to project from one side surface of the hook storage case, while the other side surface opposite to the one side surface of the hook storage case is formed. Has a protruding portion that comes into contact with the face material of the prefabricated panel. Therefore, the protrusion prevents the hook storage case from displacing to the other side surface side, which reduces the distance between the wrench insertion hole and one side surface of the hook storage case, that is, the wrench hole. As a result, a large gap is not formed between the wrench insertion hole and the wrench hole portion, and the heat insulating material can be prevented from entering the wrench insertion hole.

The other side surface of the hook storage case,
A spacer may be interposed between the prefabricated panel and the other of the pair of face materials. In this case, the spacer prevents the hook storage case from being displaced toward the other side surface.

The wrench hole may be fitted in the wrench insertion hole. In this case, since the wrench insertion hole is positioned in the wrench hole by this fitting, the wrench insertion hole and the wrench hole are less likely to be misaligned. When this positional deviation occurs, the heat insulating material may enter the wrench insertion hole. However, in the present invention, since the positional deviation is unlikely to occur, this entry is reduced.

By the way, the distance between the hook storage cases attached to the frame member, that is, the pitch, and the distance between the wrench hole portions, that is, the pitch, are different due to manufacturing errors or the like.
May be subtly different. In this way, if the pitch of the hook storage case and the pitch of the wrench hole are different,
It becomes difficult to fit the wrench hole into the wrench insertion hole of the hook storage case.

Therefore, the inner peripheral surface of the wrench insertion hole of the hook storage case has an oval shape, and the major axis of the oval is substantially parallel to the extending direction of the frame member, and the prefabricated panel. There is a case where a wrench hole portion having a substantially circular outer periphery is formed so as to protrude inwardly on one of the pair of face materials. In this case, since the wrench insertion hole is oval and the major axis of the oval is substantially parallel to the extending direction of the frame member, the pitch of the hook storage case and the pitch of the wrench hole are Even if they are different, the wrench hole can be fitted into the wrench insertion hole. Then, by this fitting, the wrench insertion hole can be positioned in the wrench hole portion. Therefore, the wrench insertion hole is not displaced from the wrench insertion hole, and the heat insulating material can be prevented from entering the wrench insertion hole. In addition, since the ellipse has a short diameter in the direction perpendicular to the extending direction of the frame member, the wrench hole is reliably positioned in the wrench insertion hole.

[Brief description of the drawings]

FIG. 1 is a perspective view of a prefabricated refrigerator in which the coupling device for prefabricated panels according to the present invention is used.

FIG. 2 is an explanatory view of a hook storage case, (a) is a front view of one side wall of the hook storage case, (b) is a development view of the hook storage case, and (c) is another side wall of the hook storage case. And (d) is a side view of (b).

FIG. 3 is an enlarged sectional view of a main part of a prefabricated panel.

FIG. 4 is an enlarged view of a wrench insertion hole of a hook storage case and a wrench hole portion of a face member, (a) is a front view,
(B) is a BB sectional view of (a), and (c) is a CC sectional view of (a).

FIG. 5 is a side view of the hook device attached to the frame member.

FIG. 6 is a side view of a hook device coupled with a pin device.

FIG. 7 is a cross-sectional view of a hook device attached to a 100 mm thick prefabricated panel.

FIG. 8 is a sectional view for explaining a conventional prefabricated panel.

[Explanation of symbols]

 D Heat Insulation Material F Hook Device (Coupling Device) L Long Diameter P Pin Device (Coupling Device) W Frame Material W1 Frame Material 2 Prefabricated Panel 6 Hook Storage Case 13 Wrench Insertion Hole 23 Hook Member (Hook) 29 Rib (Projection) 31 Surface Material 32 Face material 34 Hole for wrench 51 Spacer

Claims (4)

[Claims] 1. A prefabricated panel includes a pair of face materials facing each other with a gap, and a heat insulating material filled and foamed in a space between the face materials, and another prefabricated panel. The prefabricated panel coupling device, which is disposed adjacent to each other and connects the adjacent prefabricated panels to each other, includes a hook device and a pin device, and the hook device includes the adjacent prefabricated devices. A pin device that is built into one of the panels and that engages with the hook device is a prefabricated panel coupling device that is built into the other of the adjacent prefabricated panels, wherein the hook device is a hook storage case. And a hook that is rotatably provided inside the hook storage case, and a hook for rotating the hook is provided on one side surface of the hook storage case. The wrench insertion hole into which the switch is inserted is formed to project, and the wrench insertion hole communicates with a wrench hole formed in one of the pair of face materials of the prefabricated panel, A prefabricated panel coupling device, wherein a protrusion that abuts on the other of the pair of face materials of the prefabricated panel is formed on the other side surface opposite to the one side surface. 2. A prefabricated panel includes a pair of face materials facing each other with a gap, and a heat insulating material filled and foamed in a space between the face materials, and another prefabricated panel. The prefabricated panel coupling device, which is disposed adjacent to each other and connects the adjacent prefabricated panels to each other, includes a hook device and a pin device, and the hook device includes the adjacent prefabricated devices. A pin device that is built into one of the panels and that engages with the hook device is a prefabricated panel coupling device that is built into the other of the adjacent prefabricated panels, wherein the hook device is a hook storage case. And a hook that is rotatably provided inside the hook storage case, and a hook for rotating the hook is provided on one side surface of the hook storage case. The wrench insertion hole into which the switch is inserted is formed to project, and the wrench insertion hole communicates with a wrench hole formed in one of the pair of face materials of the prefabricated panel, A prefabricated panel coupling device, wherein a spacer is interposed between the other side surface opposite to the one side surface and the other of the pair of face materials of the prefabricated panel. 3. The prefabricated panel includes a pair of face materials facing each other with a gap, and a heat insulating material filled and foamed in a space between the face materials, and another prefabricated panel. The prefabricated panel coupling device, which is disposed adjacent to each other and connects the adjacent prefabricated panels to each other, includes a hook device and a pin device, and the hook device includes the adjacent prefabricated devices. A pin device that is built into one of the panels and that engages with the hook device is a prefabricated panel coupling device that is built into the other of the adjacent prefabricated panels, wherein the hook device is a hook storage case. And a hook that is rotatably provided inside the hook storage case, and a hook for rotating the hook is provided on one side surface of the hook storage case. The wrench insertion hole into which the switch is inserted is formed to project, and a wrench hole is formed to project inward on one of the pair of face members of the prefabricated panel. A coupling device for a prefabricated panel, which is fitted in a wrench insertion hole. 4. The prefabricated panel comprises a pair of face materials facing each other with a space, a frame material closing an end of a space between the face materials, and a foam filled in a space between the face materials. The prefabricated panel coupling device, which is provided adjacent to other prefabricated panels and has a heat insulating material, is a hook device and a pin device. The hook device is attached to the frame member and is built in one of the adjacent prefabricated panels, and the pin device that engages with the hook device is the adjacent prefabricated panel. In the prefabricated panel coupling device built in the other side of the panel, the hook device includes a hook storage case and a hook rotatably provided inside the hook storage case. A wrench insertion hole into which a wrench for rotating the hook is inserted is formed to project on one side surface of the hook storage case, and the inner peripheral surface of the wrench insertion hole has an oval shape. The major axis of the ellipse is substantially parallel to the direction in which the frame member extends, and one of the pair of face members of the prefabricated panel is formed with a wrench hole having a substantially circular outer periphery protruding inward. The prefabricated panel coupling device is characterized in that the wrench hole is fitted in the wrench insertion hole.