EP1632921A2 - Manual hazard warning device - Google Patents

Abstract

A fire alarm is triggered by a switch in a rectangular frame (1) countersunk in the wall. The switch unit has a glass cover plate (5) whose upper edge rests when not activated against a spring-lever (3). The lever is coupled to a switch (2.2, 2.3). The lower edge of the plate rests against a cam (6.2) forming part of a spindle (6) that is coupled to the switch and exposed at one end and operates the switch for test purposes.

Description

The invention relates to a manual hazard detector, comprising a housing of a base plate and a hood-shaped cover plate having at least one window-like opening in which a depressible rectangular plate is seated, which is in operative connection with at least one switch, during and after the pressing of the plate permanently changes its switching state.

Such danger detectors, which are often referred to as fire detectors or as a push button, are known. Some countries prescribe a compressible elastic plastic plate, which returns to its original position when the detector is reset manually. Other countries prescribe a pane of glass which is destroyed when pushed in. At rest, the plate holds with one of its edges, usually with its upper edge, the pusher of a microswitch in its working position. When pressing the plate, the pusher of the microswitch is released, so that its switching contact changes from the working to the rest position. The switching signal generated thereby is fed via a line connected to the detector directly or after processing in an electronic circuit of a control center.

The external dimensions of such a detector are standardized and relatively small. The available space is usually not enough to accommodate an electrical circuit in the same volume. However, this is desirable if the message is to be transmitted to the control center as a data telegram or other detector states, eg "test" and / or "feedback" should be signaled.

A manual hazard detector of the kind mentioned in the preamble of claim 1 is known from DE 101 43 284 A1. The impressible plate is made of plastic. Against its inside is the one end of a two-armed lever. When the plate is pressed in, this arm of the lever actuates a switch arranged underneath. At the same time the other arm of the lever comes to lie under an opening of the housing upper part. To reset a tool or key is inserted into the opening to push the lever back to its original position.

The invention has for its object to provide a hazard detector of the type specified in the introduction, but on the other hand simplified construction.

This object is inventively achieved in that the plate holds in the resting state of the detector with one of its edges a pivotable about the base plate axis one-armed lever against the force of at least one spring in its rest position that the lever is in operative connection with the switch, that the plate bears with its opposite edge against a cam of a cylindrical body which is rotatable about an axis perpendicular to the base plate and that the cylindrical body is rotatable in a position in which the cam is out of engagement with the edge of the plate, whereby spring-loaded lever pivots in its triggered or alarm position.

This construction is very space-saving and comes with a few simple-shaped parts, which are therefore inexpensive to produce from plastic by injection molding. Tripped, ie brought into alarm state is the Detector in a conventional manner by pressing the plate between the lever and the cam of the cylindrical body to a certain extent clamped. If it is a plastic plate, so its edge slides from the cam of the cylindrical body and under the action of the spring-loaded lever in a lying in the direction of the base plate of the detector behind the cam exemption. If it is a glass plate, the lever is free by their destruction. In both cases, therefore, in turn, the spring-loaded switching member of the switch changes, for example, from its working to its rest position, so that a normally open contact and / or closes a normally closed contact. For the purpose of a functional test of the detector, however, the clamping of the depressible plate between the lever and the cam of the cylindrical body is canceled by rotation of the latter. The lever thus displaces the plate in the plane of its rest position, the plate does not break even when executed as a glass sheet. By turning back the cylindrical body to its initial position of the detector comes back to its normal resting or ready state after the functional test. Since the mechanical functional elements are arranged in the region of two opposite edges of the plate, expediently in the region of its lower edge, behind the plate in the lower housing part there is sufficient space for accommodating an electrical circuit board.

Suitably, the cylindrical body is rotatable through an opening of the hood-shaped cover plate by means of a key-like tool (claim 2), so that the detector housing for performing a function test or to return a depressed (plastic) plate does not need to be opened.

In particular, the hood-shaped cover plate may have a preferably closable opening, via which a key-like tool for rotating the cylindrical body can be inserted (claim 3). The closure of the opening in the cover plate prevents the ingress of dust and water into the detector and, together with the key-like tool, makes unauthorized manipulation of the detector difficult.

The plate can at its two other, free longitudinal edges, preferably this is their side edges, slidably guided (claim 4), so that on the one hand behind the plate a large space remains, in which the plate is pressed and on the other hand counteracting a displacement of the plate Frictional forces can be kept low.

In particular, the plate can be supported with its two other, free longitudinal edges on a dust cover, the center has a trough-shaped recessed area as a free space into which the plate is pressed (claim 5). Preferably, this dust cover is designed in cooperation with the base plate so that it also provides protection against the ingress of water.

For defined guidance of the plate, the latter in the region of that edge, against which the pivotable lever rests, in the middle have a against the underlying dust cover supporting pin (claim 6).

Preferably, the lever has a flag, which is in the idle state of the detector outside the window opening and in the tripped state within the window opening (claim 7), so that it can be seen at a glance, whether the detector is in rest or in the alarm state, what before In particular, if the detector is equipped with an elastic plastic plate, otherwise not readily ascertainable.

To minimize the space requirement and the pivot angle of the lever, it is expedient if the pivot axis of the lever is located near a corner of the base plate (claim 8).

The lever loading into its working position spring can act on the free end (claim 9). Therefore, it is sufficient a relatively weak spring, which excludes the risk of a lever made of plastic that the lever deforms over time by cold flow.

To screw the detector, the base plate may have two holes and the dust cover corresponding recessed openings that dustproof with these holes are aligned (claim 10) so that the detector can be mounted without dust and dirt can penetrate into its interior.

Preferably, the hood-shaped cover plate with its one edge in the corresponding edge of the base plate can be suspended and the base plate has in the region of its opposite edge latching claws which engage in corresponding openings in the adjacent side surface of the hood-shaped cover plate (claim 11), so that the hood-shaped cover plate without tools can be snapped onto the detector base plate.

To open the detector, the key-shaped tool two lugs at a distance of the openings in the respective side surface of the hood-shaped cover plate have (claim 12).

Instead, the roller-shaped body may be rotatable in a position in which its cam or a second cam bulges the respective side wall of the hood-shaped cover plate so far that the latching claws out of engagement with the Openings in this side surface come (claim 13). This makes it possible to open the detector without additional tool to bring him by restoring the plastic plate or replacement of the glass plate from the alarm state back to the idle or standby state.

The cylindrical body can rest in the rotational position in which its cam holds the plate in the rest position against a stop or be releasably locked (claim 14). This ensures that the plate, whether after a functional test, or after a reset of the detector from the alarm to the resting state, is vibration-proof in accordance with the regulations.

Fig. 1

eine Explosionsdarstellung des Melders,

Fig. 2

die Deckplatte,

Fig. 3

den Melder im Ruhestand bei abgenommener Deckplatte,

Fig. 4

die Staubschutzhaube,

Fig. 5

den Melder im Alarmzustand, bei abgenommener Deckplatte,

Fig. 6

den Melder im durch einen Funktionstest ausgelösten und

Fig. 7

das Öffnen des Meldergehäuses.

Der in Fig. 1

dargestellte, manuell auslösbare Gefahren- melder umfasst eine wandmontierbare Grundplatte 1, eine Schaltungsplatine 2, einen schwenkbaren Hebel 3, eine Staubschutzhaube 4, eine eindrückbare Platte 5, einen walzenförmigen Körper 6, eine haubenförmige Deckplatte 7 als Außengehäuse, ein schlüsselartiges Werkzeug 8 und eine Schutzklappe 9.

In the drawing, an embodiment of the proposed detector is shown in partial schematic simplification. It shows:

Fig. 1

an exploded view of the detector,

Fig. 2

the cover plate,

Fig. 3

the detector in retirement with the cover plate removed,

Fig. 4

the dust cover,

Fig. 5

the detector in alarm condition, with removed cover plate,

Fig. 6

the detector in the triggered by a bump test and

Fig. 7

opening the detector housing.

The in Fig. 1

illustrated, manually triggered danger detector comprises a wall-mountable base plate 1, a circuit board 2, a pivoting lever 3, a dust cover 4, a depressible plate 5, a cylindrical body 6, a hood-shaped cover plate 7 as an outer housing, a key-like tool 8 and a protective cover. 9

The base plate 1 has positioning pins 1.1 for the circuit board 2 and holes 1.2 for the passage of arranged on the back of the circuit board 2 pins 2.1 to connect them to a terminal block 2.4. The base plate 1 has at its upper edge recesses 1.3 for suspending not visible in this representation lugs on the upper side edge of the hood-shaped cover plate 7, which also has not visible openings at its lower side edge in this illustration, in which located at the bottom of the base plate 1 Intervene locking claws 1.4. At its side webs 1.5, the base plate 1 has detents 1.6, with which recesses 4.1 in the side walls 4.2 of the dust cover 4 correspond. In the base plate 1, two mounting holes 1.7 are formed with a sleeve-shaped edge.

The circuit board 2 carries next to the indicated electronic components near its upper edge two microswitches 2.2 and 2.3 with switching flags 2.21 and 2.31.

The lever 3 is in operative connection with the switching lugs 2.21 and 2.31. It comprises a bearing bush 3.1 and a flag 3.2. On the free end of the lever acts a curved leaf spring 3.3.

The dust cover 4 has openings 4.3, which correspond to the holes 1.7 of the base plate 1, two-sided guide webs 4.4 and in between a trough-shaped recessed area 4.5. Not visible in this view Light guides correspond with LEDs, not shown, on the circuit board 2, which signal the operating state of the detector.

The depressible plate 5, which may consist of an elastic plastic disc or a prestressed, easily destructible glass, is held laterally by the guide webs 4.4 of the dust cover 4 and covers the trough-shaped recessed portion 4.5 of the dust cover 4. Near its upper edge, the plate has the back, i. hidden in this view, a distance pin, with which it is supported on the dust cover 4 in the region of the trough-shaped depression 4.5.

The cylindrical body 6 is rotatably held in a sleeve 1.8 of the base plate 1 and has a holding him in this bush, elastic locking lug 6.1, a certain interaction with the lower edge of the plate 5 cam 6.2, a recessed, in cross-section approximately triangular pin 6.3 and a stop lug 6.4.

The hood-shaped cover plate 7 has an upper window-shaped recess 7.1, in which a transparent plastic window 7.2 is snapped, a lower, large window opening 7.3, through which the plate 5 is accessible and a closable via a plastic slide 7.4 opening 7.5 in height of the axis of the cylindrical body 6th

The key-shaped tool 8 has at the end of its cylindrical shaft 8.1 a key profile 8.2, which is complementary to the countersunk pin 6.3 of the cylindrical body 6.

The protective flap 9 is preferably made of a transparent plastic and has lateral pivot pins which are in holes in the side surfaces of the cover plate 7 near Intervene upper edge.

Figure 2 shows a view of the cover plate 7 from the inside. At its upper edge, it has two lugs 7.6, which are intended for engagement in the recesses 1.3 of the base plate 1 (see Fig .. 1). Near the opening 7.5, the lower side wall has two small openings 7.7, which are intended for engagement of the latching claws 1.4 of the base plate 1 (see Fig. 1).

Figure 3 shows the detector in the assembled state, but without the hood-shaped cover plate. The dust cover 4 is shown partially broken in the upper area. The detector is in its standby or standby position. The crushable plate 5 is supported with its lower edge against the cam 6.2 of the cylindrical body 6, the stop lug 6.4 rests against a pin of the base plate 1. With its upper edge, therefore, the plate 5 holds the pivotally mounted at its left end about a pivot lever 3 against the force of the free end of the lever 3 loading leaf spring 3.3 in the position shown, in which the lever 3 with its opposite side surface, the switching flags 2.21 and 2.31 of the microswitches 2.2 and 2.3 in their spring-loaded working position, ie keeps depressed. The flag 3.2 of the lever 3 is located outside the window opening 7.3 of the hood-shaped cover plate 7 (see Fig. 1).

Figure 4 is a view of the dust cover 4 from the inside. An integrally molded pivot 4.6 for the bearing bush 3.1 of the lever 3 (see Fig. 3) has a locking lug 4.61, which secures this lever on the pivot 4.6. The apertures 4.3 have stepped, raised edges 4.31, which are intended to engage in the corresponding, bush-shaped edges of the mounting holes 1.7 of the base plate 1 (see Fig. 1) to the ingress of dust and water in the surrounded by the dust cover 4 interior to prevent the detector. Hollow pins 4.7 serve as hold-downs for the circuit board 2 in Fig. 1. Light guide 4.8 bridge the distance between SMD LEDs (not shown) on the circuit board 2 and openings in the window-shaped recess 7.1 of the cover plate (see Fig .. 1). On the inside of the upper edge of the abutment is 4.9 for the fixed leg of the leaf spring 3.3 in Fig. 3 can be seen.

FIG. 5 shows the detector in the same illustration as FIG. 3, but in the alarm state. The existing in this case of an elastic plastic plate 5 has been pressed and is correspondingly concave. Their lower edge is therefore behind the cams 6.2 of the cylindrical body 6 passes and has been moved by the lever 3 under the action of the leaf spring 3.3 in the position shown down. The microswitches 2.2 and 2.3 facing side edge of the lever 3 has the switching flags 2.21 and 2.31 of the microswitches 2.2 and 2.3 released, so that the latter have switched to their rest position. The circuit on the circuit board 2 processes this change in the switching states of the microswitches 2.2 and 2.3 into a corresponding alarm signal at the external terminals 2.4 (see Fig. 1). The flag 3.2 of the lever 3 is now visible in the cutout of the window opening 7.3 of the cover plate 7 (see Fig. 1).

FIG. 6 shows the same view of the detector as FIG. 5, but in this case the alarm condition has not been generated by depressing the plate 5 but for the purpose of a functional test or trial alarm by rotation of the cylindrical body 6 by means of the key-shaped tool 8. Under the action of the spring-loaded lever 3, the plate 5 has moved downwards, but is after rotation of the cylindrical body 6 by about 90 ° clockwise with its lower edge as before on the cam 6.2 of the cylindrical body 6. By rotating the wrench-shaped tool 8 in the counterclockwise direction, the plate 5 can be returned to the rest or standby state shown in FIG.

In a corresponding manner, the detector is returned from the alarm state (see Fig. 5) back to the idle state. After rotation of the wrench-shaped tool 8 in the position shown in Fig. 6, the plate 5 jumps from the concave shape in which its lower edge in the release behind the cam 6.2 rests on the cylindrical body 6, back to the flat position, so now her Lower edge rests again on the cam 6.2 of the cylindrical body 6 and by rotation of the latter, the plate 5 is moved upwards into its position holding the lever 3 in the rest position.

If the plate 5 is not made of plastic but is a destructible glass, a new disc is used in the drawn in Figure 6 position of the cylindrical body 6 after removal of the destroyed disc and returned by rotation of the key-shaped tool 8 in its upper clamped position.

At least to replace a destroyed glass pane, the detector housing must be opened by removing the hood-shaped cover plate 7. This is shown schematically in FIG. The key-shaped tool 8 has two lugs 8.3 spaced from the openings 7.7 in the lower side edge of the hood-shaped cover plate 7 (see Fig. 2). 7, the latching claws 1.4 of the base plate 1 are pushed back inwards out of the openings 7. 7, so that the cover plate 7 can pivot away from the base plate 1 with its lower edge and then be removed with slight lifting, the lugs 7.6 of the cover plate 7 of the recesses 1.3 at the top Edge of the base plate 1 (see Fig. 1) free.

Claims (14)

Manual danger detector, comprising a housing of a base plate (1) and a hood-shaped cover plate (7), which has at least one window opening (7.2) in which a depressible rectangular plate (5) sits, which is in operative connection with at least one switch (2.2, 2.3), which permanently changes its switching state during and after pressing in of the plate (5), characterized in that the plate (5) in the resting state of the detector with one of its edges a one-arm pivoting about an axis perpendicular to the base plate (1) Lever (3) against the force of at least one spring (3.3) holds in its rest position that the lever (3) is in operative connection with the switch (2.2, 2.3) that the plate (5) with its opposite edge against a cam ( 6.2) abuts a cylindrical body (6) which is rotatable about an axis perpendicular to the base plate (1) axis and that the cylindrical body (6) is rotatable in a position in which the cam (6.2) except one handle comes with the edge of the plate (5), whereby the spring-loaded lever (3) pivots in its triggered or alarm position. Hazard detector according to claim 1, characterized in that the cylindrical body (6) through an opening (7.5) of the hood-shaped cover plate (7) is rotatable by means of a key-like tool (8). Hazard detector according to claim 1, characterized in that the hood-shaped cover plate (7) has a closable opening (7.5), via which a key-like tool (8) for rotating the roller-shaped Body (6) is insertable. Hazard detector according to one of claims 1 to 3, characterized in that the plate (5) is displaceably guided at its two free longitudinal edges. Hazard detector according to one of claims 1 to 4, characterized in that the plate (5) with its two free longitudinal edges on a dust cover (4) is supported, which has a recess (4.5) in the center, in which the plate is pressed. Hazard detector according to claim 5, characterized in that the plate (5) in the region of that edge against which the pivotable lever (3) rests, in the middle has a against the underlying dust cover (4) supporting pins. Hazard detector according to one of claims 1 to 6, characterized in that the lever (3) has a flag (3.2), which is in the idle state of the detector outside the window opening (7.2) and in the triggered state within this window opening (7.2). Hazard detector according to one of claims 1 to 7, characterized in that the pivot axis of the lever (3) is located near a corner of the base plate (1). Hazard detector according to claim 8, characterized in that the lever (3) in its working position loading spring (3.3) engages the free end of the lever (3). Hazard detector according to one of claims 5 to 9, characterized in that the base plate (1) has two holes (1.2) for screw fastening the hazard alarm has and that the dust cover (4) has corresponding recessed openings (4.3), the dustproof with the mounting holes (1.2) are aligned. Hazard detector according to one of claims 1 to 10, characterized in that the hood-shaped cover plate (7) with its one edge in the corresponding edge of the base plate (1) can be suspended and that the base plate (1) in the region of its opposite edge latching claws (1.4) has, which engage in corresponding openings (7.7) in the adjacent side surface of the hood-shaped cover plate (7). Hazard detector according to claim 11, characterized in that the key-shaped tool (8) has two lugs (8.3) spaced from the openings (7.7) in the side surface of the hood-shaped cover plate (7). Hazard detector according to claim 11, characterized in that the cylindrical body (6) is rotatable in a position in which a cam deforms the side wall of the hood-shaped cover plate (7) so far that the latching claws (1.4) are disengaged from the openings (7.7 ) come in this side area. Hazard detector according to one of claims 1 to 13, characterized in that the roller-shaped body (6) in the position in which its cam (7.4) holds the plate (5) in the rest position, is detachably latched.

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