JPS6410209B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a top plate (drafting table) of a desk, drafting table, etc.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

1, 2, 3, and 4 are frames of the top plate 5, which are connected to each other to form a rectangular shape as a whole. Holes 6 and 7 are formed in the respective set positions of the frames 1 and 3, and a peripheral surface portion 9a of a female screw block 9 in which a screw hole 8 for a screw is formed is fitted into the holes 6 and 7. , the corner portion 9b of the block 9 projects toward the inner surfaces of the frames 1 and 3. Reference numeral 10 denotes a lower surface forming member made of a flexible sheet-like member or a thin plate, such as soft vinyl chloride, and the extreme end of this member 10 is adhered to the plane of the stepped portion 11 on the lower surface of each of the frames 1, 2, 3, and 4. ing. Reference numeral 12 denotes an upper surface forming member made of a flexible sheet-like member or a thin plate, such as soft vinyl chloride;
The edge portions of the frames 1, 2, 3, and 4 are bonded to or in contact with the planes of the step portions 13 on the upper surfaces of the frames 1, 2, 3, and 4, respectively. A space 14 surrounded by the frames 1, 2, 3, 4, the upper surface forming member 12, and the lower surface forming member 10 is formed inside the top plate 5. Reference numeral 15 denotes an injection hole transparently provided at a suitable position in the frame body 1, and numeral 16 denotes an air vent hole transparently provided at a suitable position in the frame body 3.

Place the top plate 5 on the mounting table 17, and place the frame 1,
The flat surface of a side regulating block 18 (only one is shown) is brought into contact with each of the outer surfaces of the blocks 2, 3, and 4. This block 18 is connected to a piston rod 19 of a hydraulic cylinder (not shown).
Reference numeral 20 denotes a plane regulating block that comes into contact with the upper surface forming member 12, and is connected to a rod 21 that is driven up and down by a hydraulic cylinder (not shown). The injection hole 1 of the side regulating block 18
A through hole is provided in a portion facing the air vent hole 5 and the air vent hole 16, and is configured such that injection work and air vent work can be performed through the through hole.

In the above-described structure, a fixed amount of a hard foam material 22, such as hard foamed urethane, is press-fitted into the space 14 through the injection hole 15 with the blocks 18 and 20 fixedly abutting the top and side surfaces of the top plate 5. The amount of injection varies depending on the expansion ratio of the foam material, and when the foam material is sufficiently foamed, it fills the space in the top plate 5.
In addition, the amount is such that it has an appropriate internal pressure. The foaming ratio of this hard foam material is determined by the preferable weight of the top plate 5,
It can be selected appropriately in consideration of hardness. When the hard foam material 22 is injected into the space 14 and foaming approaches the end, the upper and lower surface forming members 12, 10 are rolled into a flat state by the foaming pressure of the hard foam material 22, and the foam inside the space 14 is rolled. The hard foam material 22 is adhered to the hard foam material 22. The aforementioned mounting stand 17, side regulation block 1
8 and the plane regulating block 20 are fixed to the upper and lower surface forming members 1 by the foaming pressure when the hard foam material 22 is injected.
2 and 10 are prevented from deforming outwardly. After the hard foam material 22 injected into the space 14 has hardened, the hydraulic cylinder is driven to separate the side regulating blocks 18 and the flat regulating blocks 20 from the side and top surfaces of the top plate 5, thereby removing the top plate 5. Take it out and move on to the next manufacturing process.

Next, another embodiment will be described with reference to FIG.

Reference numeral 23 denotes an elevating body connected to a piston rod 24 of a hydraulic cylinder (not shown), on which a flat suction surface 25 is formed. A large number of small holes 26 that are opened in the suction surface 25 are connected to the elevating body 23.
The chamber 27 is connected to a solenoid valve 28 and a connecting pipe 29.
It communicates with an air intake device (not shown) via.

In the above configuration, first, the upper surface forming member 12
is placed at a predetermined position on the mounting table 17, and in this state, the elevating body 23 is lowered to the position of the upper surface forming member 12, and the solenoid valve 28 is opened to generate suction force on the suction surface 25, thereby Then, the upper surface forming member 12 is attracted to the suction surface 25 of the elevating body 23. At this time, the upper surface forming member 12 is sucked flatly without any unevenness due to the suction force of the suction device.

Next, the elevating body 23 is raised to an appropriate position, and the frames 1, 2, 3, 4 assembled in a square shape are placed on the mounting table 17.
Then, the lower surface forming member 10 bonded to the lower surfaces of the frames 1, 2, 3, and 4 is placed. This placement position is determined in relation to the adsorption position of the upper surface forming member 12 to the elevating body 23.

Next, by driving the hydraulic cylinder, the side regulating block 18 is brought into fixed contact with each outer surface of the frames 1, 2, 3, and 4, and the elevating body 23 is lowered to move the upper surface forming member 12 into the frame. 1, 2, 3, and 4, and the upper surface position of the top plate 5 is regulated by the elevating body 23.

Next, according to the procedure described above, the hard foam material 22 is injected into the space 14, the hard foam material 22 is hardened in the space 14, and the upper and lower surface forming members 12, 10 are formed on the hard foam material 22. When the adhesive is bonded, the solenoid valve 28 is closed and the hydraulic cylinder is driven to separate the side regulating block 18 and the elevating body 23 from the top plate 5.

Since the present invention is configured as described above, it can be manufactured at a lower cost compared to the case where the top plate is made of wood. Furthermore, since the top surface forming member is formed from a soft sheet-like member, it can be used for a compass, etc. It can be pierced with a needle, and has the effect of increasing commercial value, especially when used as a drawing board.

[Brief explanation of drawings]

The figures show preferred embodiments of the present invention, in which Fig. 1 is an external view of the top plate, Fig. 2 is a sectional view taken along line A-A, Fig. 3 is a sectional view taken along line B-B, and Fig. 4 is a top plate. FIG. 5 is a cross-sectional view for explaining another method of manufacturing the top plate. 1, 2, 3, 4...frame body, 5...top plate, 10...
...Lower surface forming member, 12... Upper surface forming member, 14...
...Space part, 15...Injection hole, 16...Air vent hole,
17...Placement table, 18...Side regulation block, 1
9... Piston rod, 20... Plane regulating block, 22... Hard foam material, 23... Lifting platform, 25
... Suction surface, 26 ... Small hole, 27 ... Suction chamber, 28 ... Solenoid valve.

Claims (1)

[Claims] 1. A frame surrounding the four sides, an upper surface forming member made of a flexible and soft sheet member, a lower surface forming member consisting of a flexible sheet member, and press-fitted into the closed space formed by the frame and the upper and lower surface forming members. A top plate comprising a hard foamed material and an air vent hole that communicates the sealed space with the outside.