JPH0315295Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a rigid foamed urethane casing, which can be used as a casing for an air conditioner, etc.

[Conventional technology]

Figure 5 shows the appearance of the wall-mounted air conditioner. This AA cross section is shown in FIG.

Air 18 taken in from the suction grille 20 of the front cover 13 is cooled or heated by the heat exchanger 14,
The cooled or heated air 19 is blown out by the blower 16 through the outlet grille 17 . The surface of the outer panel 12 is cooled by the cooling air 19 and dew condenses on the surface of the outer panel 12. Therefore, the heat insulating material 11 (in this example, foamed polystyrene) is used to form an air path and insulate the outer panel 12. The skin 12 is made of sheet metal or plastic molding which can serve as a strength member.

In FIG. 7, both the outer panel 12 and the heat insulating material 11 are replaced with a casing 1 made of hard foamed urethane that serves as a strength member and a heat insulator.

A detailed cross-sectional view of this rigid urethane foam is shown in FIG.

A skin layer 21 having a thickness of to covers both the front and back surfaces, and a foam layer 22 having a thickness of ti is formed between these layers. The skin layer 21 acts as a strength member and the foam layer 22 has thermal insulation uses.

FIG. 9 shows an example of coupling other parts 23 to this casing 1. The bonding strength is mainly determined by the thread of the tatsu pin screw 24 that is applied to the skin layer (approximately 2 mm). If strength is required or the screw is installed and removed many times, insert nut 25 (made of metal) as shown in Fig. 11 is used. It is embedded during molding and tightened with screws 26.

[Problem that the invention attempts to solve]

Since the screw locking structure of conventional hard foam urethane casings is configured as described above, it requires time to set the insert nut in the mold, which not only impairs productivity, but also adds to the cost of the insert nut. There were problems such as high product costs.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention provides a hole approximately equal to the thread root diameter formed by the skin layer in the screw tightening portion of the hard foam urethane casing.

[Effect]

By providing the holes as described above, the skin layer formed along the holes lengthens the biting portion of the screw thread, thereby increasing the screw tightening strength.

〔Example〕

A first embodiment of the present invention will be described with reference to FIG.
A hole 4 having a diameter D that is approximately equal to the root diameter d of the screw 5 to be tightened is provided in the screw tightening portion of the casing 1.
A skin layer 2 is formed along.

3 and 4 show the second embodiment,
By providing one or more depressions 7 around the hole 4, a skin layer 8 as shown in FIG. 3 is formed. This skin layer 8 has the effect of reinforcing the skin layer around the hole 4 and making it stronger than the first embodiment against the external force 10 applied in the direction of tilting the shaft 9 of the hole 4.

[Effect of idea]

As is clear from the above, according to the present invention, since the skin layer is formed to surround the hole, the threads of the screws can sufficiently bite into the skin layer, which serves as a strength member, and parts can be installed inexpensively without using insert nuts, etc.
And it can be firmly realized.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the first embodiment of the present invention, Fig. 2 is a cross-sectional view showing the screw tightening state, Fig. 3 is a cross-sectional view showing the second embodiment of the present invention, and Fig. 4 is a cross-sectional view showing the second embodiment of the present invention. Third
Figure 5 is an external view of a conventional wall-mounted air conditioner, Figures 6 and 7 are cross-sectional views corresponding to Figure 5 A-A of different examples, and Figure 8 is a hard foam urethane casing. 9 is a sectional view showing the screw tightening state, FIG. 10 is a sectional view showing another conventional example of the hard foam urethane casing, and FIG. 11 is the conventional example shown in FIG. 10. It is a part outline drawing used for an example. 1: casing, 2: skin layer, 3: foam layer,
4: Hole, 5: Screw, 6: Part, 7: Hole, 8:
skin layer.

Claims (1)

[Scope of utility model registration request] Screw locking of a hard foamed urethane casing, characterized in that, in a casing made of hard foamed urethane, a hole having a diameter approximately equal to the screw root diameter formed by a skin layer is provided in the screw tightening portion of the casing. structure.