JPS6229042B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a core plate made of a soft material such as synthetic resin foam such as polyurethane foam or polystyrene foam, and surface plate materials are integrally attached to both sides of the core plate to form a laminated structure. The present invention relates to a method for forming leg attachment connections on a top plate, with the aim of efficiently and uniformly forming leg attachment connections on the plate.

Conventionally, artificial wood tops have often been used for the tops of tables, desks, etc., but these artificial wood tops usually have hard and strong materials such as laminated plywood for the inner layer. Artificial wood boards that are soft and have a core made of synthetic resin foam, for example, have rarely been used as top boards.

Artificial wood boards made of foam as a core material are lightweight and have low manufacturing costs, making them an attractive material. Since it is necessary to press and secure the screws and bolts into the board, the inner layer of the board must have enough rigidity and strength to stably fix these screws and bolts, and soft foam etc. cannot meet this requirement. .

The present invention was developed for the purpose of using such a lightweight artificial wood board as a top plate with the inner layer made of synthetic resin foam, etc. The foam is used as the core plate of the inner layer, and both surfaces are made of laminated plywood. A recess is provided in the core plate part from the bottom side of the top plate main body formed by attaching a hard surface board material, etc., and a recess is filled with hard synthetic resin, and connecting fittings such as screw receivers are buried inside the recess. Another object of the present invention is to provide an efficient method for molding a top plate made of a lightweight wooden board, which forms a connecting part for attaching the legs and enables stable connection and fixation of the legs.

FIG. 1 is a perspective view showing the process of forming a top plate according to the method of the present invention, with main parts in cross section. The main body 1 of the top plate is formed by laminating the upper and lower surfaces of a core plate 2 made of polyurethane foam formed to the required thickness. Thin plywood surface board material 3,
4 are integrally attached and formed. A through hole 5 is formed in the lower surface plate material 4 of the main body of the top plate, and a blind hole-shaped recess 6 is provided in the core plate 2 through this hole.

The main body of the top plate shown here is made up of two surface plates 3 and 4 set in opposition at the required distance within a fixed formwork, and a thermosetting synthetic resin, in this case foamed material, is placed between the two. A polyethylene resin liquid mixed with additives, catalysts, stabilizers, etc. is injected and internally foamed to form the core plate 2. At the same time, the surface plates 3 and 4 on both sides are joined together by the adhesive force of this synthetic resin and laminated. It was formed.

A plurality of recesses 6 may be provided depending on the number of legs 7 and the shape of the leg upper end attachment portion 8, but here six recesses are provided as shown in FIG. And each recess 6
is formed into a tapered blind hole that expands inwardly, and its back is formed to reach the back surface of the top surface plate material 3.

In the figure, 9 is a thermosetting synthetic resin filled into the recess 6 formed above and hardened, and 10 is a bag with a connecting metal fitting embedded in this synthetic resin and integrally provided on the bottom surface of the top plate main body. It is a nut-shaped screw receiver.
Reference numeral 11 designates a frame body for holding the screw receivers 10 embedded in each of the formed recesses 6 via the synthetic resin 9 in a suspended manner until the synthetic resin hardens;
Reference numeral 12 denotes a mounting protrusion serving as a holding member to which the screw receiver is freely attached and detached.

A screw receiver 10 is shown embedded in the recess 6 on the left side of FIG. 1 with a synthetic resin 9 interposed therebetween, with its opening 10' opening on the lower surface of the main body of the top plate.
The frame body 11 is used to hold the screw receivers 10 buried in each recess 6 in this manner, and in this embodiment, as shown in FIG. It is formed into a rectangular frame so as to fit into the six recesses 6, and fitting holes are provided at positions corresponding to the respective recesses, into which fitting protrusions 12 made of an elastic material such as rubber are fitted. The screw receiver is mounted in an upright position, and the raised protrusion is inserted into the opening 10' of the screw receiver to be detachably mounted.

Figures 5 and 6 show the state in which the screw receivers 10 have been attached to the protrusions, and then the frame body 11 is viewed from above the top plate main body 1 with the frame 11 turned upside down, and the screw receivers have been inserted into each problem point in a suspended manner. After being inserted into the recess in this way, the gap in the recess 6 is filled with a thermosetting synthetic resin liquid, and the screw receiver 10, which is suspended and supported, is buried integrally. That's what I do.

The frame 11 is separated from the main body of the top plate after the screw receiver 10 is stabilized by the hardening of the synthetic resin 9, and then the protrusion 12 fitted into the opening 10' is pulled out and the screw is removed. The work of embedding the receiver 10 is completed.

The top plate according to the present invention is molded as described above, and the leg mounting connections are formed by embedding screw receivers 10 through synthetic resin 9 in the recesses 6 of the main body of the top plate. A mounting part 8 provided at the upper end of the leg 7 is attached to the part 13 as shown in FIG. 2, and the leg is attached by screwing in a screw 14.

In addition, FIG. 3 shows various aspects of the screw receiver 10, and FIG. A shows an example in which an annular groove 10a to prevent slipping out is provided on the circumferential surface of the receiver with a female screw hole in the center. , Figure B shows an example in which a large number of protrusions 10b are provided on the circumferential surface instead of grooves to prevent the screws from coming off and also to prevent the screws from rotating together when tightening.

FIG. 4 shows another embodiment in which a bolt 15 is embedded in the recess 6 in place of the screw receiver 10 described above, and the threaded portion protrudes from the synthetic resin 9.

Although the case in this embodiment is not shown,
The attachment can be accomplished by opening a through hole in the attachment portion 8, passing the bolt 15 through it, and tightening a nut therethrough. Also, by changing from the screw receiver 10 to the bolt 15, the frame 11 has a projection 1.
2, an annular holding member made of an elastic material is provided to detachably attach the bolt 15, and the threaded part of the bolt is inserted into the hole and held, and the head of the bolt is inserted into the recess of the main plate. It is better to be able to insert it in place 6.

The present invention has been explained above based on the embodiments, but connecting fittings such as screw receivers and bolts are buried in the recesses 6 provided in the soft core plate part of the top plate using a hard synthetic resin 9 as a foothold. Since the legs 7 are fixed using the connecting fittings, it is possible to attach the legs in the same manner as a top plate made of hard laminated plywood, although the inner layer is soft. As explained above, this connection fitting is buried by attaching it freely to the holding member made of an elastic material provided on the frame using its elasticity, and attaching the frame to the bottom surface of the main body of the top plate. The metal fittings can be hung in each recess, and the embedding work can be completed by simply filling the synthetic resin, allowing the resin to harden, and then removing the frame. , the leg attachment connection part can be formed quickly and accurately.

Of course, the attachment of the connecting fitting to the holding member can be easily carried out by fitting it into the protrusion in the case of a screw receiver, or by inserting it in the case of a bolt, and there is no difficulty in the work.

On the other hand, in the present invention, the connecting fitting is attached to the holding member of the frame, and the connecting fitting can be suspended inside the recess 6 by attaching the frame to the lower surface of the top plate. Therefore, the fixed part is completely buried in the synthetic resin filled in the recess, and a part of the connecting fitting comes into contact with the upper surface plate 3 of the main body of the top plate, causing deformation of this plate after molding. Since there is no need to give anything away, it is possible to provide a beautiful top plate.

The shape and size of the synthetic resin for embedding the connecting fittings may be arbitrarily determined depending on the size and thickness of the top plate, the degree of softness of the core plate, the size of the connecting fittings, etc., depending on the shape of the recess. From the viewpoint of stability, it is preferable that the shape of this recess is a tapered shape that expands toward the back.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
The figure is a partial perspective view of the top plate with the main parts in cross section, Figure 2 is a partial perspective view of the top plate with the main parts in cross section showing how the legs are attached, and Figure 3 is the connection buried in the recess. FIG. 4 is a perspective view showing an embodiment of the metal fittings; FIG.
The figure is an explanatory perspective view showing a state in which the connecting metal fittings are inserted into the recesses in the main body of the top plate, and FIG. 6 is a longitudinal sectional front view showing an enlarged main part of FIG. 5. 1... Top plate, 2... Core plate, 3, 4... Surface board material, 6... Recess, 7... Leg, 8... Leg attachment part,
9... Thermosetting synthetic resin, 10... Screw receiver serving as a connecting member, 11... Frame, 12... Projecting body serving as a holding member, 13... Connecting portion, 15... Bolt serving as a connecting member.

Claims (1)

[Claims] 1. In the main body of the top plate, which is made of a core plate made of a soft material such as synthetic resin foam with the required thickness and laminated with surface plates attached to both sides, a blind hole-shaped recess is inserted into the core plate part through the lower side surface plate material. The required number of recesses are formed in advance at predetermined positions, and the main body of the top plate is turned over and held horizontally so that the recesses face upward, while the frame is configured to cross over the recesses provided in the required number. The body is provided with a holding member made of a soft elastic material such as rubber at a location corresponding to the recess, and connecting fittings such as screw receivers or bolts are removably attached to this holding member, and the top plate is attached from above the main body. After inserting the frame into each of the recesses in a suspended manner by facing the frame, the gap around the connecting fitting is filled with a thermosetting synthetic resin liquid, which is then hardened and connected inside the recess. For attaching legs to a top plate by embedding and fixing the metal fittings, then pulling the frame away from the bottom surface of the top plate main body, removing the connecting fittings from the holding member, and forming a connection part for attaching the legs on the bottom surface of the top plate main body. Forming method for connecting parts.