FI111667B - Fire alarm - Google Patents

Abstract

In a fire detector which consists of a detector insert (2) and a holder (1), in which the detector insert (2) in the inserted state completely covers the holder (1), the detector insert (2) has a movable closure device, preferably consisting of a ring (3), by means of which the detector insert (2) can be mechanically locked relative to the holder (1). Marking elements (5, 6) are provided on the detector insert (2), which elements permit the correct end position of the detector insert (2) relative to the holder (1) to be monitored. <IMAGE>

Description

5, 111667

Fire alarm

The invention relates to a fire alarm according to the preamble of claim 1.

Such fire alarms are well known in the art. They are designed to protect lives and goods in fire detection systems and fire detection. These fire detection systems generally consist of 10 signal centers and fire alarms located at protected sites.

Fire alarms include fire detection sensors, electrical amplifiers and hardware information for transmission to a signal center. Structurally, the fire alarm system consists of the fire alarm system itself (alarm unit) with sensors and other electronics, and the alarm stand (chuck) which is mounted in a permanently monitored space and in which the alarm unit 20 is placed. This allows the alarm units to be removed for inspection and re-installed.

Given the high demands placed upon the reliability of fire alarm devices, it is extremely important to eliminate, where possible, the weaknesses of those devices. One of those weaknesses is, of course, the alarm unit - socket connection, on which the reliability of the entire fire alarm device 30 depends. Therefore, it is understandable that manufacturers of such devices are striving to secure, by means of good structural solutions, an alarm unit - socket connection.

35 Alarm unit - socket connector requirements include: 1 - reliable electrical contact - contact protection against dirt and corrosion 2 111667 - secure mechanical connections - good exterior design (appearance)

The last requirement therefore becomes important because the alarm is often placed in places where the aesthetics of design are significant. These include theaters, museums and historic buildings.

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In order to combine beautiful design with good contact protection, the German utility model DE-U1-92'10'858 has suggested, inter alia, that the alarm unit be constructed so that, when mounted, it covers the entire seat. There is also the advantage that any discoloration of the obsolete placenta as it ages will not impair the appearance of the alarm system if, for example, the alarm unit is replaced over time.

A disadvantage of this design must be the fact that in all alarms where the alarm unit covers the is-20 hair, it is difficult to ascertain whether the alarm unit sits properly in the seat. This is an uncompromising condition for all fire alarms which consist of an alarm unit and a socket. Incorrectly installed alarm units are the primary sources of error and interference and give rise to complaints.

Previously unequivocal efforts were not made to solve this problem. After the installation, checking the correct position of the alarm unit by 30 trained professionals was deemed necessary. The higher costs involved must be accepted. for the reliability of the converter system, although the cost of installation is increased.

35 It is an object of the present invention to provide a fire alarm of the kind mentioned above, which reduces the drawbacks of prior art alarms, and to provide, above all, a fire alarm of the same kind, wherein the alarm unit comprises correctly 5 sits in its socket, also a few meters away. This will simplify the audit while minimizing the costs involved.

This task is accomplished by the above-mentioned pa-10 alarm, which has the features of claim 1. Preferred embodiments and embodiments of the invention are defined in the following claims.

In the following, the invention will be explained in more detail in the preferred embodiments shown by the figures. With

Figure 1 is a side elevational view of the fire alarm 20 according to the invention with the fastening system in an open position,

Figure 2 Cross-sectional view of the alarm of Figure 1 along line A ... A, 25 Figure 3 Side view of the alarm of Figure 1 with fastening system closed

Figure 4 is a cross-sectional view of the alarm of Figure 3 along line B ... B.

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Figure 1 shows the fire alarm socket 1 and the alarm unit 2. with a movable ring 3 and a lower part 4.

The ring 3 is freely movable within a defined angle with respect to the lower part 4 of the alarm unit 2. The alarm unit 2 is locked with the seat 1 by means of a fastening system. Outside the ring 3, a first marking element 5 and a second marking element 6 are disposed outside the lower part 4 of the alarm unit 2 so that, when the fire alarm is unlocked, the first marking element 5 is 5 at a distinct angle from the second marking element 6.

The locking system consists of three guide cam 7 and one stop cam 8 placed on the inside of ring 3. The seat 1 has three guide rods 9 belonging to the control cam 7 and also a retaining cam 10 belonging to the counter cam 8.

15 Here, the aforementioned three guide arms are placed in the associated steering brackets. The clamping system is actuated when the ring 3 is rotated at a certain angle and the three guide cam 7 passes along the associated guide rails 9. In this position, as shown in Figures 3 and 4, the first and second marking elements 5 and 6 are in a straight line with respect to each other. Completed and properly secured, these marking elements are easily visible from a distance of several meters.

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Variations of the fire alarm described above are possible within the scope of the invention as defined in the claims and will be apparent to those skilled in the art.

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Claims (8)

111667 A fire alarm consisting of an alarm unit (2) and a seat (1) on which the alarm unit (2) can be placed and wherein the alarm unit i 5 (2) in a closed state completely covers the fire seat (1), characterized in that 2) is a movable fastening system (3) for mechanically securing the alarm unit (2) with the seat (1) and having a first marking element (5) 10, which in the end position of the alarm unit (2) ) with a second marking element (6), which makes it possible to detect the correct end position of the alarm unit (2) and the seat (1) from the outside. 15 Fire alarm according to Claim 1, characterized in that the fastening system consists of a ring (3) placed on the upper end of the alarm unit (2). Fire detector according to Claims 1 and 2, characterized in that the marking elements (5 and 6) consist of design elements, which are placed adjacent or superimposed to identify the correct end position of the alarm unit (2). 25 Fire alarm according to Claim 3, characterized in that the marking elements (5 and 6) consist of exposed lines. Fire alarm according to claims 1-4, characterized in that the marking elements (5 and 6) are distinguished in color from the alarm unit (2). Fire detector according to claims 1-5, characterized in that the mounting system (3) comprises parts which are constructed and arranged to enable an electrical contact which provides a signal when the alarm unit * 111667 (2) reaches its final position. Fire alarm according to Claim 6, characterized in that the equipment includes other parts 5 mounted so that the signal is transmitted to the control panel. Fire alarm according to Claims 5 to 7, characterized in that the equipment includes other components by means of which an optical signal is generated in the event of electrical contact of the alarm unit 10. * · · 111667