JPS5812312Y2 - Mounting device for protective cover for fire detector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a protective cover mounting device for protecting a sensing part of a fire detector such as a thermal detector or a smoke detector from the outside.

In general, in fixed-temperature heat sensors using bimetals or the like, the heat-sensitive element is exposed and the heat-collecting plate protrudes, so there is a risk of damaging the heat-collecting plate or the heat-sensitive element during installation work or other operations.

Furthermore, since the differential heat sensor that detects the expansion of air has an exposed heat-sensing part, if an object hits the heat-sensing part, the characteristics may change and malfunction may occur.

In the case of smoke detectors, the detection part is covered with a protective cover made of metal or the like to prevent the effects of wind, etc., but even then, the characteristics of the smoke detector change if it is hit by an object.

Conventionally, devices are known in which a protective cover is provided in order to protect the above-mentioned sensing section from external forces, but the protective cover fits into a protective cover mounting hole newly provided on the sensor base. Or, it was attached to the base by screwing into a screw hole provided in the peripheral wall of the base.

The above-mentioned protective cover mounting device has the disadvantage that if it is fitted into the mounting hole, it will come off due to a strong impact, and if it is fixed with screws, there are threaded holes in the peripheral wall of the base, so use a screwdriver to tighten the screws. When tightening, the wrist hits the ceiling surface, which makes the work difficult, which not only increases the working time, but also increases the number of parts and manufacturing costs.

The present invention eliminates the above-mentioned drawbacks, can be used without modifying the structure of conventional sensors, especially the structure of the base, has appropriate strength against external forces, and is easy to install. An object of the present invention is to provide a device for easily attaching a protective cover for a fire detector.

An example of an embodiment in which the present invention is applied to a constant temperature heat sensor will be described in detail below with reference to the drawings.

Figure 1 shows the external appearance of a conventionally known constant temperature heat detector: a fire detector consisting of a heat sensitive element 1 and a heat collecting plate 2, and a base 3 to which the fire detector is fixed. And it becomes□
, a mounting hole 4 is bored in the base.

As shown in an enlarged view in FIG. 2, this mounting hole 4 has a cylindrical portion 5 formed around it, and as shown in FIG. 3, the end of the cylindrical portion is pressed against the ceiling 6. The base 3 is attached to the ceiling 6 with the inserted screws 7.

As shown in FIG. 4 as the above-mentioned mounting hole 4, the end of the mounting hole 4 does not touch the ceiling 6 and has an appropriate space between the end and the ceiling 6. There is also one in which the base 3 is attached to the ceiling 6 by screws 7 inserted so that the base 3 is pressed against the ceiling 6.

FIG. 5 shows a state in which a protective cover 9 is attached to the sensor shown in FIG. 1, and the sensing portion is protected by the protective cover.

This protective cover 9 is made of, for example, thermosetting resin, and is provided with a locking portion 10 consisting of a claw at a position corresponding to the mounting hole 4 of the base 3, as shown enlarged in FIG. The locking portion is formed so that when the base 3 is as shown in FIG. 4, it is inserted into the mounting hole 4 and locked as shown in FIG. 7.

By inserting the locking part 10 into the mounting hole 4, the protective cover 9 is attached to the base 317? Both are installed integrally.

Further, a hole 11 is provided in the protective cover 9 so as to be approximately concentric with the mounting hole 4 into which the locking portion 10 is inserted, and by inserting the screw 7 into the throttle hole and the mounting hole 4. , the base 3 and the protective cover 9 can be integrally attached to the ceiling surface.

The above explanation is for the case where the base 3 is as shown in FIG. 4, but when the base 3 is as shown in FIG. 3, the locking part 10 is fitted into the cylindrical part 5 as shown in FIG. By providing a notch 12 to be fitted, the locking part 10 inserted into the mounting hole 4 is fitted into the notch 12, and the protective cover 9 is integrally attached to the base 3 by this fitting. Ru.

In this state, by inserting the screws 7 into the holes 11 and the mounting holes 4, the base 3 and the protective cover 9 are assembled as shown in FIG.
is integrally attached to the ceiling 6.

In the above embodiment, a pawl is used as the locking part 10, but the locking part 10 is not limited to this. For example, the protective cover 9 can be press-fitted.
may be locked to the base 3VC.

However, in order to avoid affecting the heat-sensitive characteristics of the heat-sensitive part by attaching the protective cover 9, as illustrated in FIG.
It is desirable that the cross-sectional shape of the beams 13 of the protective cover 9 be wedge-shaped or wing-shaped to reduce air resistance, and that the beams 13 be oriented so that airflow is guided to the heat collecting plate 2.

Arrow A indicates a hot air flow from below, and arrow B indicates a hot air flow from the side coming from the ceiling 6, which is discharged as shown by arrow C.

The shape of the beam 13 is as shown in FIG. 11, and this shape is strong against external forces from below and external forces from the lateral direction.

The present invention is as described above, and can be used with conventional sensor bases without any modification.Also, the locking part provided on the protective cover, etc. is locked into the mounting hole, and it can be screwed into place. Since the protective cover is installed, it has sufficient strength so that it will not easily come off even when subjected to strong external force, and furthermore, the protective cover can be easily installed.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventionally known constant temperature heat sensor, Figure 2 is an enlarged perspective view of the main part of Figure 1, and Figure 3 is A of Figure 2.
4 is a sectional view of another conventional example showing the same part as in FIG. Figure 6 is an enlarged perspective view of the locking part of the protective cover, Figure 7 is a sectional view showing the same part as Figure 2 with the protective cover attached, and Figure 8 is the protective cover attached. The second version improved for
FIG. 9 is a sectional view showing the same part as FIG. 3 with the protective cover attached. FIG. 10 is a main part showing another embodiment of the protective cover. The cross-sectional front view and FIG. 11 are perspective views of essential parts of the one shown in FIG. 10. 3...Base, 4...Mounting hole, 7...
・・・Screw, 9...Succor cover, 10...
- Locking part, 11...hole, 12...notch part.

Claims (1)

[Scope of utility model registration request] For a fire detector having a base on which a fire detection part is fixed and a mounting hole is drilled, a locking part for attaching a protective cover for protecting the fire detection part to the base is provided with the protection. The cover is provided at a position corresponding to the mounting hole of the base, and with the locking part locked in the mounting hole, a screw is inserted into the mounting hole to integrally connect the base and the protective cover. A mounting device for a protective cover for a fire detector, characterized in that it is configured so that it can be mounted on a ceiling surface.