RU2402073C1 - Manual fire-warning device - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: manual fire-warning device includes housing consisting of the base on which there arranged is electric circuit with switch, and cover with an opening for drive element installed in guides made on the cover with possibility of back-and-forth movement along its inner surface. Drive element has pressure force application surface and shank oriented in the direction of applied force and consisting of side walls and attaching the side walls of connection strap retaining the movable switch contact till the pressure force is applied. Side walls of shank are provided with possibility of deformation under effect of longitudinal loads and with protrusions on inner surfaces facing each other. On inner surface of the cover, perpendicular to it, there made is cylindrical element located as assembled warning device between side walls of shank and interacting with protrusions of side walls.

EFFECT: simplifying the device design and improving its operating reliability by providing structural version of the device elements.

11 cl, 6 dwg

Description

FIELD OF THE INVENTION

The invention relates to the field of fire alarm, and more particularly to devices for manually switching on and transmitting an alarm signal in fire and fire alarm systems.

State of the art

Known fire manual detector containing a closed housing with a housing placed in it by a contact element and a drive element in the form of a rotary handle, providing, when it is rotated, the contact element is triggered (see patent for SU No. 1343433, IPC: G08B 17/02, publ. 10.10.87 g.).

Known manual fire detector containing a detachable housing, in the lower part of which there is a circuit board with an optical indicator and a switch, and in the upper part there is a window for a drive element, consisting of a pusher to which a manual action is applied, and a clamping element associated with it in the form an elastic plate acting on the movable contact of the switch (see patent RU No. 2323220, IPC: G08B 17/00, publ. 2008.06.20). This design of the drive element, with a transverse movement of the pusher in the housing, is used most often. The device is characterized by a high degree of protection against accidental pressing provided by the presence of a protective pivoting glass that covers the window with the drive element, as well as by the manufacture of an elastic plate with two stable positions and one intermediate, for the passage of which requires the application of significant effort - not less than 15 N. However, this In this case, there is a danger that the device will not be activated correctly, since an uninitiated person can press only before resistance plates and at the same time he will be sure that the "alarm" signal was generated.

Closest to the claimed device, by the presence of similar structural features, is a warning device and an alarm, i.e. a detector comprising a detachable housing consisting of a base with an electrical circuit thereon with a switch and a cover with a window for a drive element mounted in guides formed on the cover with the possibility of reciprocating movement along its inner surface, i.e. longitudinal movement (see patent for US invention No. 6632108, IPC: H01R 9/22, publ. 10/14/2003). The drive element is characterized by the presence of a means of influencing the movable contact of the switch, the surface of the application of pressure force and the presence of an elongated narrow part - a shank formed by two sidewalls interconnected to form a through hole in which the lock assembly is located, fixing the drive element in the activated pressed position.

The drive element has two stable positions: “upper”, i.e. before the application of a pressure force to this element, and the “lower” corresponding to the activated state of the detector, established after the movement of the actuating element under the influence of the aforementioned pressure forces and termination of the aforementioned effect. The "upper" position of the drive element is provided by a spring fixed to the housing cover, behind which the drive element is suspended, and a locking mechanism is used to fix the drive element in the "lower" position, located in the shank hole. Among the shortcomings of the mentioned device, the absence of any protection against accidental pressing, the complexity and low reliability of operation, due to the presence of a large number of spring elements, as well as the need to open the housing to return the drive element to its original position, can be noted.

Disclosure of invention

The task of the invention is to simplify the device detector, increasing the reliability of its operation and security against accidental operation.

The problem is solved due to the fact that in a manual fire detector containing a detachable housing, consisting of a base on which an electrical circuit with a switch is placed, and a cover with a window for a drive element mounted in guides formed on the cover with the possibility of reciprocating movement along its inner surface and characterized by the presence of a surface of application of a pressure force, a liner oriented in the direction of the applied force and consisting of sidewalls connected x with each other with the formation of a through hole to accommodate the fixing unit of the drive element, and the presence of a part acting on the movable contact of the switch, according to the invention, the part of the drive element acting on the movable contact of the switch is made in the form of a connecting sidewall of the jumper holding the movable contact until application pressure forces, sidewalls of the liner are made with the possibility of elastic deformation under the influence of longitudinal loads and with protrusions on the internal surfaces Facing towards each other, wherein the fixing unit is made as formed on the inner surface of the cover perpendicular to the cylindrical element cooperating with said sidewall ledges.

Unlike the prototype, in which the retention of the drive element in the upper and lower stable positions is provided by different nodes, in the inventive detector, both functions are performed by the same locking "lock" node, which is characterized by ease of implementation. The said node includes two interacting elements: a cylindrical element formed on the inner surface of the lid, and the opposing protrusions of the side walls interacting with it.

The cylindrical element is preferably integrally formed with the lid when forming the latter, i.e., in fact, it is part of the housing lid. The protrusions on the sidewalls are also formed in the manufacture of the drive element. Thus, in the device, individual nodes are excluded, providing upper and lower stable positions of the drive element, and the implementation of these functions is realized due to the design of the device body and the drive element.

The inventive device is characterized by a minimum number of nodes and parts, it is: a housing consisting of a base and a cover, a drive element and an electrical circuit. Simplicity of execution and a minimum number of functional units provide simplicity and manufacturability of the detector and its reliability.

To achieve the specified technical result and to ensure the possibility of the device working, it is also important that the sides of the drive element have certain elasticity properties, i.e. possess the possibility of elastic deformation under the influence of applied longitudinal compressive forces.

In the inactive state of the detector, the sidewalls of the shank are straightforward, their protrusions rest on top of the cylindrical element, thereby ensuring an “upper” stable position of the drive element. At the same time, the jumper connecting the sidewall holds the movable contact of the switch.

When the detector button is pressed, i.e. when a manual pressure force is applied to the corresponding surface of the drive element, the sidewalls are subjected to longitudinal compressive loads, under the influence of which the sidewalls bend, and to overcome the resistance of the protrusions of the sidewalls abutting against the cylindrical element, sufficient considerable efforts are required. The need for the application of the mentioned significant efforts eliminates the possibility of accidentally pressing the detector button and its operation.

When sufficient force is applied, the sidewalls bend, which is called longitudinal bending in the resistance of the materials, allowing the protrusion of the sidewalls to slip on the surface of the cylindrical element from top to bottom around it. When the protrusions are under the cylindrical element, the load is removed, the sidewalls return to their original rectilinear state due to the presence of elasticity properties.

In the process of moving the drive element from the “upper” position to the “lower” jumper, which kept the movable contact of the circuit breaker in standby mode of the detector, releases this contact, and the latter returns to its normal state, ensuring the circuit is opened (or closed). In this case, an alarm signal is sent to the control device.

In a specific example implementation of the device below, a circuit breaker with closing (normally open) contacts is used. In the “quiet” state of the detector, the jumper presses the movable contact to the stationary one. After pressing the drive element, the jumper releases the movable contact and the latter freely rises in the space between the sides of the shank, for which the distance between the inner surfaces of the sides is made larger than the width of the movable contact. However, the above example does not limit the possibility of using normally closed contacts.

In the specific case of the implementation of the device, the protrusions are located opposite each other and are made semicircular in shape. However, this does not limit the possibility of another design of the protrusions.

To return the drive element from the lower position to the upper one, a hole is provided for a return key inserted into this hole, and the return will also require the application of an appropriate force to overcome the “resistance” of the protrusions of the sidewalls.

In a specific case, the implementation of the detector sidewalls are made in the form of rod elements of rectangular cross-section.

The jumper connecting the free ends of the sidewalls is preferably U-shaped, which improves the manufacturability of the manufacture of the drive element in the form of a single part and at the same time improves the elastic properties of the sidewalls.

The base, cover and drive element are made of plastic by molding.

In order to increase the strength of the sidewalls, it is advisable to perform protrusions in the form of bilateral thickening of the sidewall.

The cylindrical element may be further provided with travel stops for the drive element.

In order to increase the security of the detector from accidental pressing, the housing cover is equipped with a protective flap made in the form of a rotary plate made of glass or transparent plastic. On the front surface of the plate is usually placed the appropriate information labels.

Brief Description of the Drawings

Figure 1 presents a General view of the inventive detector, isometry;

figure 2 - drive element, General view;

figure 3 is a section aa from figure 1;

figure 4 is a view In from figure 3, an inside view of the cover with a drive installed in it

an element;

figure 5 - shows the device with the cover removed, the drive element is in the upper position corresponding to the standby inactive state of the detector;

figure 6 - the same after pressing, the drive element is in the lower position corresponding to the activated state of the detector.

The implementation of the invention

The manual fire detector (see Fig. 1) contains a detachable housing consisting of a base 1 and a cover 2 with a window 3 for the drive element 4. All of the mentioned parts are made by molding from plastic. A protective shutter 5 is pivotally mounted on the lid 2, covering the window 3 with the actuating element 4. The shutter 5 is made in the form of a transparent plastic plate, on the front surface of which a corresponding information inscription is applied.

The drive element 4 (see figure 2) is made in the form of a complex shape of a hollow molded element with a drive upper part 6, to which a manual pressure is applied, and a lower part in the form of a shank formed by sidewalls 7 connected by a jumper 8. On the internal facing protrusions 9 are made towards each other on the surfaces of the sidewalls 7. In this example, these are semicircular protrusions, which is the preferred form of their execution. The sides 7 at the location of the protrusions 9 are made with a thickening. An opening 10 for a return key is made in the upper drive part 6 of the element 4.

On the basis of 1 (see Figs. 3, 5-6), a board 11 is fixed with an electrical circuit of the device containing a switch 12 with a movable contact 13, an optical indicator 14, for example, a red or other color LED, a terminal connector 15 with leads for power wires, which are fed through access holes made in the housing. As the switch 12 in the above example, a switch with normally open contacts was used.

The detector assembly is as follows.

A circuit board 11 is fixed at the base 1 of the housing. A protective rotary plate 5 is fixed on the cover 2. A drive element 4 is mounted in the guides 16 formed on the cover so that its upper drive part 6 is located in the window 3 and the shank lies on the inner surface of the cover 2 while the cylindrical element 17, made on the inner side 18 of the cover 2, is located between the sidewalls 7 of the shank of the drive element, and the protrusions 9 of the sidewalls 7 rest on the element 17 from above (see Figs. 4, 5).

The halves of the case are connected, while the jumper 8 presses the movable contact 13 of the switch 12. Fasten the parts of the case with screws.

The assembled detector is preferably mounted on the wall and connected to a fire or fire alarm cable. When the loop is in good condition and the detector is inactive, the drive element 4 is in the upper position, the protrusions 9 of the sidewalls 7 rest on the cylindrical element 17 from above, the jumper 8 presses the contact 13 of the switch. The circuit is closed. The device is in standby mode, LED 14 operates in flashing mode, when short-term light pulses are displayed with a frequency of 1 time in 3-5 seconds.

In the event of a fire hazard, to activate the detector, open the protective plate 5 and press the drive element 4 from top to bottom, applying a pressure force to the surface 19 of the drive part 6.

The shank of the drive element 4, more specifically its sidewalls 7, which are rods of rectangular cross section (the same as the beam), are located under the drive part 6 and are oriented in the direction of the acting pressure forces, therefore, the applied pressure force can be characterized as centrally applied longitudinal compressive forces. The bending of a bar under the action of the indicated forces in the resistance of materials is called longitudinal bending.

When the magnitude of the applied pressure exceeded a certain “significant” threshold due to the elastic modulus of the material from which the drive element is made, the sidewalls 7 will bend, allowing the cylindrical element 17 to pass between the protrusions 9 of the sidewalls 7, which, due to the elasticity properties, return to their original position, allowing the protrusions to close. 9 under the guide cylindrical element 17 (see Fig.6). In this case, the jumper 8 slides from the movable contact 13, which, freely rising in the space between the sidewalls 7, opens the circuit, giving an alarm signal to the control device. At the same time, a characteristic click during the passage of the cylinder 17 between the protrusions 9 of the sidewalls 7 signals the operation of the detector.

In order to limit the stroke of the drive element 4 downward, the cylindrical element 17 may be provided with stops 20.

In the "activated" state of the detector, the optical indicator 14 indicates a constant glow.

The drive element 4 is returned to its original position without opening the housing by means of a return key, which can be used as a hard object inserted into the hole 10. To return the button 4 to its original position, the corresponding force is also required. The given example does not limit the possibility of using switches with normally closed contacts. In this case, the interaction of the jumper with the movable contact is the opposite: in the upper position of the drive element, the jumper holds the contact in the open state, and when pressed and moved, releases it and it closes the contacts.

The device is characterized by simplicity, reliability, good protection against accidental pressing.

Claims (11)

1. The manual fire detector, comprising a detachable housing, consisting of a base on which an electrical circuit with a switch is placed, and a cover with a window for a drive element mounted in guides formed on the cover with the possibility of reciprocating movement along its inner surface and characterized by the presence of a surface application of pressure force, a liner oriented in the direction of the applied force and consisting of sidewalls interconnected to form a through hole an arrangement for locating the fixing unit of the drive element and the presence of a part acting on the movable contact of the switch, characterized in that the part of the drive element acting on the movable contact of the switch is made in the form of a connecting sidewall of the jumper holding the movable contact until the pressure is applied, the side of the shank made with the possibility of elastic deformation under the influence of longitudinal loads and with protrusions on the inner surfaces facing towards each other, while the fixation node made in the form of a cylindrical element formed on the inner surface of the lid perpendicular to it, interacting with the said protrusions of the sidewalls. 2. The detector according to claim 1, characterized in that the sidewalls are made in the form of rod elements of rectangular cross-section, while the jumper connecting the free ends of the sidewalls is made U-shaped. 3. The detector according to claim 1, characterized in that the base, cover and drive element are molded from plastic. 4. The detector according to claim 1, characterized in that the protrusions are made semicircular in shape. 5. The detector according to claim 1, characterized in that the drive element is provided with a through hole for the return key. 6. The detector according to claim 1, characterized in that the sidewalls are placed relative to each other at a distance that allows free movement of the movable contact of the switch. 7. The detector according to claim 1, characterized in that a switch with normally open contacts is used as a switch. 8. The detector according to claim 1, characterized in that the cylindrical element is equipped with movement limiters of the drive element. 9. The detector according to claim 1, characterized in that the cover is equipped with a protective flap mounted on it with the possibility of rotation. 10. The detector according to claim 9, characterized in that the protective flap is made in the form of a plate of glass or transparent plastic. 11. The detector according to claim 9, characterized in that the protective flap is provided with an informational inscription.

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