EP1687786B1 - Smoke detector - Google Patents

Description

State of the art

The invention relates to a fire detector according to the preamble of claim 1. Fire detectors are used for the early detection of fires in areas with appropriate fire load for the protection of persons and property. Fire detectors are usually mounted on the ceiling and have a round, white housing with a diameter of about 10cm and a height of about 7cm to 10 cm. Due to its function, the housing sits on the ceiling. Fire detectors are standard industrial products and fire detectors of one type and manufacturer usually look the same. The corresponding housing size is usually immediately recognizable as a fire detector in rooms with public traffic on the ceiling. The uniformity of the series production and the housing form thus always represent a compromise between the function of the fire detector and the taste of the user and the visual requirements of the environment.

Out DE 101 18 913 A1 a scattered light smoke detector is known, which has a light emitter and a light receiver, the arranged such that a scattering point outside of the scattered light smoke detector is located outdoors, wherein the scattered light smoke detector has a cover for protecting the light emitter and the light receiver, and means for distinguishing between smoke and other foreign bodies, which are located in a region around the scattering point. The means for distinguishing between smoke and other foreign bodies have a processor for analyzing the time course of received signals of the light receiver, wherein the processor is connectable to the light receiver. The technology used in this scattered light smoke detector for the detection of a fire allows a substantially flush-mounted installation of the scattered light smoke detector. As a result, an important step in the sense of an inconspicuous installation of such fire detectors is already made. However, such a fire detector installed flush with the ceiling deviates greatly from the environment with regard to its color design, in particular in rooms designed in color, and thus continues to be perceived as a conspicuous and disturbing object. However, a conceivable color adaptation of the fire detector to the outside final cover by using a plastic with appropriate color would lead to an incalculable variety of different types with a correspondingly large logistical effort. Despite a greater variety of colors but in the context of a standardized mass production exact adaptation to the prevailing at the installation color design is not possible. It should also be noted that as part of renovations, the color scheme of the environment could be changed. An originally originally color-adjusted fire detector during the initial installation would then appear again as a disturbing foreign body. A subsequent overpainting of the fire detector to adapt to the newly designed environment is not readily admissible, since in a flush fire detector without optical labyrinth there is a risk that an improperly applied overpainting the Sensitivity of the fire detector is adversely affected.

US 5333418 shows a smoke detector hidden in the ceiling behind a cap.

Out DE 101 18 913 A1 Furthermore, a scattered light smoke detector is known, which has two light receivers or an imaging optics for a light receiver for setting a defined measuring volume.

Advantages of the invention

The inventively designed fire detector with the features of claim 1 offers the advantage of universal usability, since it is adaptable to virtually any environmental conditions in a simple and cost-effective manner. The fire detector has a cap which can be connected to the housing of the fire detector and terminates the housing flush with the ceiling. The cap has a recess into which pre-cut films can be inserted before the cap is placed on the housing of the fire detector. Such films are inexpensive to produce light-proof design with a variety of color shades. In order to make the film visible, the cap is preferably made transparent. Preferably, the fire detector is designed as a standard mounting kit that includes films with the usual living room colors. Preferably, the housing and the cap can be connected to one another by a latching or clip connection. In a further embodiment, a hook and loop fastener may be provided. Such releasable connection means on the one hand ensure a secure hold of the cap on the housing of the fire detector. On the other hand, however, they also make it possible for the cover cap to be easily removed for replacement of a film and to be reconnected to the housing. In order to achieve optimum color matching even in difficult environmental conditions, the material and shape of the cap can support color matching. Thus, the impression can be supported by a slightly convex shape of the cap, that shades harmoniously merge into each other. In addition, the cap can completely or at least in partial areas of its surface also be slightly frosted to further this impression. The above measures blur the differences between adjacent areas of different surface texture and color. It is particularly efficient to equip the films on both sides with different colors and / or different surface design. In this way, even more color variants are available in the accessory set. Of course, it is also possible to attach a replaceable film with a neutral color, which is then painted over at the place of assembly and in this way exactly adaptable to the environment. There are also fire detectors used that do not cover the base edge after insertion into the socket. In this case, the base edge itself can be covered with a panel. Again, the aperture can be designed so that it is easily removable for the purpose of inserting a film. Advantageously, cap and / or aperture can also be configured as a template for the matching blank of cover material. As a result, matching cover material can be cut to size at the place of assembly to suit the environment and inserted in place instead of a foil in the cover cap. In a further embodiment, it goes without saying that a film with a contrasting color which differs greatly from the environment can also be used if this is desired for design reasons. As a result, special optical effects can be achieved. This great flexibility is made possible by the solution according to the invention.

drawing

Figur 1

ein erstes Ausführungsbeispiel eines deckenbündig einbaubaren Brandmelders;

Figur 2

ein zweites Ausführungsbeispiel eines Brandmelders.

Embodiments of the invention are explained below with reference to the drawing. It shows

FIG. 1

a first embodiment of a flush-mounted fire alarm;

FIG. 2

a second embodiment of a fire detector.

Description of the embodiments

FIG. 1 shows a first embodiment of the invention. Shown is a fire detector 1 in a cross section. The fire detector 1 comprises a flush mounting box 1.4 for mounting the fire detector 1 in a recess 5 of the ceiling 4, in which a cable, not shown in the drawing for the connection of the fire detector 1 is introduced. Furthermore, the fire detector 1 comprises a base 1.5, which is connected to the interior of the flush-mounted box 1.4 and on which the electrical wires of the cable are placed on contact elements and a detector insert 1.1, which is inserted with a releasable closure device in the base 1.5 and thereby automatically to the Contact elements is connected. In the detector insert 1.1, a radiation receiver 1.2 and a radiation transmitter 1.3 are arranged. Their beam paths include a litter volume for the detection of combustion gases. Furthermore, the fire detector 1 comprises a preferably transparent cap 3 and an exchangeable film 2, which is arranged between the cap 3 and the detector insert 1.1. In the normal course of an installation, the flush-mounted box 1.4 and the base 1.5 can be pre-assembled independently of the actual detector insert 1.1. It does not matter at what time of the assembly progress the ceiling color is applied to the ceiling 4. When painting the ceiling 4 is required in principle that the detector insert 1.1 is not mounted. The detector 1.1 is normally introduced by a specialist in the base 1.5 and checked for correct function. Shortly before inserting the detector insert 1.1 in the base 1.5 now selects the specialist, depending on the color of the ceiling 4, one of her color matching foil 2, expertly triggers the cap 3 of the detector insert 1.1 and insert the selected foil 2, which has an appropriate fit due to industrial manufacturing. Subsequently, the cap 3 is again connected to the detector insert 1.1. The expert ensures that when inserting the film 2 of the fire detector 1 is not damaged and its function is maintained. The selection of corresponding film 2 can be done together with the user, so that the color selection of the conditions of use of the fire alarm system and the wishes of the user corresponds. The unused foils 2 can be stored in the documentation of the fire alarm system. They are then in a possible change in color of the ceiling 4 as part of a repainting for the adjustment of the color of the fire detector 1 continue to be available. When painting the ceiling 4 of the fire detector 1 must be removed in advance by the specialist, so that even if a change of the film 2 ensures that the fire alarm 1 is treated professionally.

In FIG. 2 is a further embodiment of a fire detector 1 shown in a cross section. Again, a flush mounting box 1.4 is provided, which is fixed in a recess 5 of the ceiling 4. In the flush mounting box 1.4, a base 1.5 is arranged. A detector insert 1.1 is detachably connected to the base 1.4. In this embodiment of a fire detector 1, the detector insert 1.1 fastened in the base 1.4 does not cover the edge of the base 1.4. In order to create a pleasing transition between the detector insert 1.1 and the adjacent surface of the ceiling 4, an annular aperture 3.1 is additionally provided, which surrounds the cap 3. Also, this panel is expediently designed to be easily removable, so that even in this annular edge region a film 3.1 can be inserted.

Despite the achievable with the inventive solution high flexibility in the adaptation of a fire detector 1 to the interior design can not be achieved with a limited number of films 2, 2.1 in all applications, an exact match of the color of the ceiling 4 with the color of the films 2, 2.1 , Due to the arrangement of the films 2, 2.1 between the transparent cap 3 and the detector insert 1.1, or between the aperture 3.1 and the surface of the ceiling 4, however, additional optical effects can be effective. Because for the color perception of the viewer also play the optical Properties of the cap 3 and the aperture 3.1 a role. Due to the curvature of the cap 3 and the aperture 3.1 and the material properties of the cap 3 and aperture 3.1, there are optical gradients that compensate for the differences in the shades for the human eye. Preferably, as in FIG. 2 represented, the cap 3 designed slightly convex. This effect can be further enhanced by the fact that the cover 3, or the aperture 3.1, not completely transparent, but provided with a slight matting. In this case, the fire detector 1 appears like a slightly milky cover on the ceiling surface. Any existing differences in the shades are no longer distinguishable.

Conversely, it is also possible to insert in the fire detector 1 foils 2, which are in a high contrast in color to the color of the ceiling 4. This gives you the opportunity to play with the colors in terms of design and to achieve special visual effects when placing the annunciator.

Furthermore, it is conceivable to print the films 2, 2.1 on both sides with different colors and / or patterns. This gives the possibility of being able to select from 2n different colors with n films.

Furthermore, it is conceivable to attach an exchangeable neutral film 2, 2.1 having a suitable surface structure, which is painted on site with the ceiling color of the room and is inserted into the fire detector 1 after drying. In this way, an individual and exact color matching to an existing ceiling painting can be done.

Claims (10)

1. Smoke detector (1) comprising a base (1.5) and a detector insert (1.1) that can be connected to the base (1.5), a cover cap (3) being provided to cover the detector insert (1.1), characterized in that a film (2, 2.1) that is arranged between the cover cap (3) and the detector insert (1.1) is provided, in that the cover cap (3) has a cut-out, into which the film (2, 2.1) is inserted, and in that the cover cap (3) is transparent.
2. Smoke detector according to one of the preceding claims, characterized in that the cover cap (3) is convex.
3. Smoke detector according to one of the preceding claims, characterized in that the cover cap is matt, at least in some regions.
4. Smoke detector according to one of the preceding claims, characterized in that the cover cap (3) can be connected detachably to the detector insert (1.1) of the smoke detector (1).
5. Smoke detector according to one of the preceding claims, characterized in that the connecting means between the cover cap (3) and the detector insert (1.1) are formed as a detachable latching means or as a touch and close fastener.
6. Smoke detector according to one of the preceding claims, characterized in that the film (2, 2.1) is coloured and/or bears a pattern.
7. Smoke detector according to one of the preceding claims, characterized in that the film (2, 2.1) is coloured on both sides and/or bears patterns on both sides, different colours and/or patterns being provided for each side of the film (2, 2.1).
8. Smoke detector according to one of the preceding claims, characterized in that it comprises a substantially annular bezel (3.1) which, easily detachable, can be mounted concentrically around the cover cap (3).
9. Smoke detector according to one of the preceding claims, characterized in that the film (2, 2.1) is neutral and has a surface structure which can be painted with a commercially available ceiling paint.
10. Mounting kit having a smoke detector (1) comprising a base (1.5) and a detector insert (1.1), the mounting kit comprising a cover cap (3) that can be detachably connected to the smoke detector (1), characterized in that the mounting kit comprises a set of films comprising a plurality of replaceable films (2, 2.1), in that the cover cap (3) has a cut-out into which the films (2, 2.1) can be inserted, and in that the cover cap (3) is transparent.

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