JP2530134Y2 - Lobby intercom - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lobby intercom, and more particularly to a structure for mounting a decorative panel block.

[0002]

2. Description of the Related Art A decorative panel 1 of a conventional lobby intercom
In No. 0, as shown in FIG. 5, the decorative panel 4 and the inner unit block 3 were integrally assembled by screwing the mounting screws 7 from the surface of the decorative panel 4. However, in such a structure, since the head of the mounting screw 7 is exposed from the outer surface, the appearance is deteriorated. Recently, as a countermeasure for this, the mounting screw 7 is screwed in from the rear side of the inner box 3. What is fixed to the decorative panel 4 is considered.

[0003]

However, in these conventional structures, the decorative panel 4 and the inner box 3 are not provided.
Are formed of members having different coefficients of thermal expansion, even if the screw holes 4d of the decorative panel 4 and the screw holes 3d of the inner unit box 3 are aligned at the time of assembly,
After the mounting screws are fastened and assembled, each member expands or contracts due to a change in outside air temperature, and the periphery of the screw holes 4d of the decorative panel 4 and the periphery of the screw holes 3d of the inner unit box 3 expand. And cracks had occurred. That is, as shown in FIGS. 6 and 7, when the mounting screw 7 is tightened, a fastening pressure in the directions a to d is applied, and expansion and contraction occur every season, so that thin portions such as a, In some cases, a crack may be generated by applying a force in the direction b and the directions c and d or vice versa.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above circumstances, and has a drawback formed on a decorative panel side.
The screw holes for screwing the attached screws are
And the diameter of the screw hole formed on the inner unit box side
Is formed slightly larger than the thread of the mounting screw.
And the upper part of the screw hole provided on the inner unit box side
In the insertion slot for inserting the mounting screws.
Form a washer fitting hole for fitting the washer, and
After fitting the washer into the fitting hole,
Insert the mounting screw into the formed screw hole,
On the back of the decorative panel.
In addition to providing a good appearance, a lobby intercom equipped with a decorative block that can prevent cracking and deformation due to differences in the coefficient of thermal expansion between the inner box and the decorative panel, as well as screw fastening. The purpose is to provide.

[0005]

After the washer is fitted into the fitting hole, the mounting screw is screwed into the decorative panel side, and the inner box is integrally combined with the back of the decorative panel and fastened. Since the inner box is uniformly applied to the entire fitting hole of the inner box, the inner box can be securely attached to the decorative panel without causing cracks around the screw holes of the inner box. Further, even if the inner box and the decorative panel having different coefficients of thermal expansion expand due to the outside air temperature, the screw holes on the inner box side are larger than the mounting screws. The displacement can be absorbed. Similarly, even if the inner box or the decorative panel shrinks, the displacement due to the shrinkage can be absorbed, and no swelling or cracks occur around the screw holes of the inner box or the decorative panel.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an assembling structure of a decorative panel block of the lobby intercom according to the present invention, and FIG. 2 is a front view of the decorative panel block. As seen in these figures, the decorative panel block 10 has a door phone inside,
A decorative panel 4 that exposes an internal unit box 3 in which electric components such as a numeric keypad and a control circuit board are built in, and an operation unit such as a display unit 24, a numeric keypad 25, and a reverse master key 26 are exposed.
And is integrally assembled with mounting screws 7 in contact with the back surface of the interior panel box 10, that is, from the opening 6 a of the back plate covering the surrounding wall 3 a of the inner box 3. A flat cable 9 provided with a connector 9a is drawn out. A terminal block 2c is provided on a back plate 2d provided behind the mounting frame member 2 fixed to the embedding box 1 mounted on the wall surface W with screws 11. This terminal block 2
c is a flat cable 8 having a connector 8a at the end.
Is connected. On the terminal block 2c of the mounting frame member 2,
A signal line and a power supply introduced into the embedded box 1 attached to the wall surface W are configured to be connected. The front panel 4 is formed of a resin material in order to improve the external appearance, Box 3 is formed of an aluminum material.

[0007] The decorative panel block 10 integrally assembled as described above is pressed forward from the front frame 2b of the mounting frame member 2 into a plurality of cutout projections 2f, and is provided with decorative panel. The engaging hole 3f of the inner box 3 on the block 10 side is engaged, and a screw receiver 2a is formed from the lower part of the front frame 2b of the mounting frame member 2 so as to protrude forward. 5 is fixed by screwing. A decorative panel 4 in which the decorative panel block 10 is formed of a resin material,
When the inner box 3 made of aluminum material is fastened with screws 7 and integrally assembled, the resin molding material and the aluminum molding material having different coefficients of thermal expansion become different materials due to seasonal temperature changes. Expands and contracts. Further, there is a possibility that the thin inner unit box 3 may be cracked by fastening the screw 7.

The lobby intercom according to the present invention has a decorative part as shown in the front view of the mounting part of the inner box in FIG. 3 and the sectional view of the main part showing the structure of mounting the inner box in the decorative panel in FIG. The screw hole 4d formed on the panel 4 side for screwing the mounting screw 7 has a hole diameter corresponding to the mounting screw 7, and the hole diameter of the screw hole 3d on the inner unit box 3 side is determined by the decorative panel 4 and the inner unit box 3 The hole diameter is formed in consideration of the difference in the thermal expansion coefficient of the mounting screw 7, that is, slightly larger than the screw portion 7a of the mounting screw 7. A fitting hole 3e for a washer 8 is formed in the upper part of the screw hole 3d, that is, in the insertion opening of the mounting screw 7. The insertion hole 3e has such a depth that the head of the mounting screw 7 does not protrude. Therefore, this fitting hole 3
e, a washer 8 is fitted, and then a mounting screw 7 is screwed into a screw hole 4d formed on the decorative panel 4 side, and the inner unit box 3 is integrally combined with the back of the decorative panel 4 and fastened. The fastening force of the mounting screws 7 is
Is uniformly applied to the entire surface of the fitting hole 3e.

According to such a structure, for example, even if the inner box 3 and the decorative panel 4 having different thermal expansion coefficients expand in the thick summer season, the screw holes 3d on the inner box 3 side are attached to the mounting screws 7d. Since the screw portion 7a is slightly larger than the screw portion 7a, the displacement due to the expansion can be absorbed while the mounting screw 7 is fastened. Similarly, even if the inner box 3 and the decorative panel 4 shrink during a cold winter season, the displacement caused by the shrinkage is absorbed. Thus, as shown in FIG. 2, the decorative panel block 10, which is integrally assembled and attached to the embedding box 1, has the head 7b of the mounting screw 7.
Is hidden, so it has a good appearance.

[0010]

According to the lobby intercom of the present invention, a washer insertion hole is formed above the screw hole of the inner box mounted on the back of the decorative panel, and the washer is inserted into this insertion hole. Since the fastening pressure by the mounting screw can be widely received by this fitting hole,
It is possible to prevent the occurrence of cracks that tend to occur around the screw holes of the inner box. Also, since the screw hole of the inner box is slightly larger than the screw part of the mounting screw, even if the inner box and the decorative panel with different coefficients of thermal expansion expand or contract, the screw hole expands or shrinks. Since the displacement caused by the contraction is absorbed, it is possible to prevent the occurrence of cracks that are likely to occur around the screw holes of the inner box or the decorative panel block.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an assembling structure of a decorative panel block in a lobby intercom of the present invention.

FIG. 2 is a front view of a decorative panel block.

FIG. 3 is an enlarged front view of a mounting screw insertion portion of the inner box.

FIG. 4 is a longitudinal sectional view of a main part showing a state in which a decorative panel box is attached to an inner box by attaching screws.

FIG. 5 is an exploded perspective view showing an assembling structure of a conventional inner box.

FIG. 6 is an enlarged front view of a conventional example showing a state where an inner box is attached to a decorative panel with mounting screws.

FIG. 7 is a longitudinal sectional view of a main part of a conventional example showing a state in which an inner box is attached to a decorative panel with mounting screws.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 embedded box 2 mounting frame member 3 inner box 3 e fitting hole of washer 8 3 d screw hole 4 decorative panel 4 d screw hole 7 mounting screw 7 a screw part 8 washer 24 display part 25 numeric keypad 26 inverted master key

Claims (1)

(57) [Scope of request for utility model registration] 1. An internal unit box in which electric components such as a door phone, a numeric keypad, and a control circuit board are built inside by screwing a screw into a decorative panel side for exposing an operation unit such as a display unit and a numeric keypad. In a lobby intercom having a structure for assembling, screws for screwing mounting screws formed on the decorative panel side
The hole has a diameter corresponding to the mounting screw, and
One, the diameter of the screw hole formed in said instrument box side, the
It is formed slightly larger than the thread of the mounting screw.
And, et al provided above the threaded holes provided in said unit box side
The washer is inserted into the slot for inserting the mounting screw.
A washer insertion hole for inserting the washer,
After fitting the washer into the fitting hole,
Screw the mounting screw into the screw hole formed on the
An internal unit box is integrally assembled on the back of the decorative panel.
Lobby intercom that is to be concluded together .