DE102018002138B4 - Trigger device, percussion igniter and oxygen candle - Google Patents

Abstract

Triggering device (1) for actuating a percussion ignition device (2) of an oxygen candle (3) for a respiratory protection device, having a fastening section (4) for fastening the triggering device (1) to an assembly point, a percussion section (5) for striking a percussion ignition element of the percussion ignition device ( 2), a spring section (6) for moving the impact section (5) between a pretensioning position (V) and a relaxation position (E), a securing device (7) for securing the impact section (5) in the pretensioning position (V) and a securing section (8) ) for holding the impact section (5) by means of the securing device (7) in the pretensioning position (V), the securing section (8) having two counterholders (9) for clamping the impact section (5) by means of the securing device (7) in the pretensioning position (V ), wherein the impact section (5) is arranged in the pretensioning position (V) between the counterholders (9), thereby characterized in that the striking section (5), the spring section (6), the fastening section (4) and the securing section (8) are monolithic.

Description

The invention relates to a triggering device for actuating a percussion ignition device of an oxygen candle for a respiratory protection device, in particular an oxygen self-rescuer. The invention also relates to a percussion ignition device with a generic triggering device and an oxygen candle for a respiratory protection device, in particular an oxygen self-rescuer.

STATE OF THE ART

A large number of different respiratory protection devices are known which differ in structure and mode of operation. Basically, a distinction is made between respiratory protection devices which release stored breathing air to the breathing apparatus wearer of the breathing protection device or which process used breathing air. A special embodiment of respiratory protection devices are oxygen self-rescuers. Oxygen self-rescuers are respiratory protection devices that can be operated using pressurized oxygen and / or chemically bound oxygen. Oxygen self-rescuers are used, for example, in mining, chemical plants, drilling rigs or other environments in which there is an increased risk of contamination of the ambient air.

Known breathing apparatus has a filter device, in particular a CO ₂ filter device for filtering out CO ₂ from the used breathing air, for processing used respiratory air, that is to say air exhaled by a respirator wearer of the respiratory protection device. In addition, such respiratory protection devices can have an oxygen storage device for providing fresh oxygen, which can be added to the filtered breathing air if required. In the case of oxygen storage devices, a distinction is made in particular between storage devices which are designed to store liquid oxygen and storage devices which are designed to store chemically bound oxygen.

In the case of a respiratory protection device operating on the basis of chemically bound oxygen, hereinafter referred to as KO ₂ , in particular an oxygen self-rescuer, the CO ₂ and humidity activate the breathing air of the respirator wearer, so that finally the KO ₂ in a canister reacts and releases oxygen becomes. The released oxygen flows to a mouthpiece or into a breathing bag. The respirator inhales from this. Any excess oxygen is released into the environment through a valve.

The used air flows into the canister, in which it is cleaned of CO ₂ and moisture while simultaneously developing oxygen. Oxygen self-rescuers based on KO ₂ are designed in such a way that they release a larger amount of oxygen until the oxygen supply is exhausted, while carbon dioxide and moisture are bound. This means that there is enough oxygen available.

Due to the delayed release of oxygen in the canister, it is necessary to use a so-called starter at the beginning, which releases oxygen particularly quickly and reliably. Such an oxygen source can be designed, for example, as a pressurized gas starter. As an alternative to compressed gas starters, so-called oxygen candles and chlorate candles are often used. Sodium chlorate and lithium perchlorate are used in particular. These starters give off a large amount of bound oxygen in an exothermic reaction. In this way, the starter can deliver sufficient oxygen into the breathing apparatus in the first few minutes until the KO _{2 is} fully activated.

In order to trigger the exothermic reaction of a starter with an oxygen candle, ignition by heat is necessary, which is usually triggered with a mechanical trigger device. By means of a generic triggering device, a percussion ignition device, which, for example, has a barium peroxide-iron powder mixture, can be triggered and the oxygen candle can be activated in this way.

A large number of different triggering devices for triggering percussion ignition devices are known. Triggering devices usually have a spring element, a striking element that can be driven by the spring element, a fastening element for attaching the triggering device to the oxygen candle and a securing element for holding the striking element in a preload position in which the spring element is preloaded. To trigger the triggering device, the securing element is to be removed so that the striking element is released and moved against an impact ignition element of the impact ignition device by means of the spring force of the spring element. From the DE 10 2015 013 355 A1 For example, a trigger device according to the prior art is known.

In DE 706 351 A a cartridge b delivers oxygen for a breathing apparatus a. A short, strong spring i holds a hammer k and is able to move the hammer k against the bottom n of the cartridge b. The moving hammer k strikes against the ground n and strikes a primer e, whereby Oxygen is released. A clamp I holds the hammer k in a preloaded position against the spring force.

Known release devices have the disadvantage that they have a large number of components which have to be manufactured, stored, provided and assembled in a complex manner. The production costs of these release devices are therefore relatively high.

DISCLOSURE OF THE INVENTION

Proceeding from this prior art, the invention was based on the object of providing a triggering device for actuating a percussion ignition device of an oxygen candle for a respiratory protection device, a percussion ignition device for an oxygen candle for a respiratory protection device and an oxygen candle for a respiratory protection device which do not or at least partially do not have these disadvantages exhibit. It is therefore the object of the present invention, in particular, to provide a triggering device, a percussion ignition device and an oxygen candle which can be produced in a simple and inexpensive manner.

The above problem is solved by the patent claims. Accordingly, the object is achieved by a triggering device for actuating a percussion ignition device of an oxygen candle for a respiratory protection device with the features of independent claim 1, a percussion ignition device for an oxygen candle for a respiratory protection device with the features of the independent claim 5 and an oxygen candle for a respiratory protection device with the features of the independent claim Claim 7 solved. Further features and details of the invention emerge from the subclaims, the description and the drawings. Features and details that are described in connection with the triggering device according to the invention naturally also apply in connection with the percussion ignition device according to the invention and the oxygen candle according to the invention and vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is or can always be made to each other.

According to a first aspect of the invention, the object is achieved by a triggering device for actuating a percussion ignition device of an oxygen candle for a respiratory protection device. The triggering device comprises a fastening section for fastening the triggering device at an assembly point, a striking section for striking against an impact ignition element of the impact ignition device, a spring section for moving the impacting section between a pretensioning position and a relaxation position, a securing device for securing the impacting section in the pretensioning position and a securing section for holding of the impact section by means of the securing device in the pretensioning position. According to the invention, the impact section, the spring section, the fastening section and the securing section are monolithic.

The release device can be fastened to an assembly point by means of the fastening section. The assembly point can be formed, for example, on a percussion ignition device, on an oxygen candle or on a respiratory protection device, in particular in the area of a receptacle for an oxygen candle. The fastening section is preferably designed in such a way that it provides a fastening device, such as a screw, clamping device or the like, arranged at the assembly point with one or more contact surfaces via which a secure hold at the assembly point can be realized in interaction with the fastening device. It is therefore preferred that the fastening section has two holding surfaces, in particular parallel to one another, which are formed on opposite sides of the fastening section.

The striking section is designed to strike against a striking ignition element. Accordingly, the impact section is preferably designed such that it has sufficient rigidity and strength to trigger a conventional impact ignition element. It can be provided according to the invention that the impact section has a stiffening profile, by means of which a rigidity or strength of the impact section can be increased. Stiffening elements of the stiffening profile are preferably formed on a side of the impact section facing away from the impact ignition element in order not to hinder triggering of the impact ignition element. A side of the percussion section facing the percussion ignition element is preferably designed to be planar or essentially planar or slightly convex. In this way, a targeted impact of the impact section on the impact ignition element can be improved and thus the triggering reliability of the triggering device can be increased.

The spring section is designed to move the impact section against the impact ignition element. For this purpose, the spring section can be pretensioned in such a way that the impact section is arranged in the pretensioning position. In this state, a spring force is stored in the spring section. In order to prevent the impact section from inadvertently leaving the pretensioning position, the safety device is provided, by means of which the impact section can be fixed positively in the pretensioning position. The The securing device is preferably designed in the shape of a rod or pin and can be clamped to the impact section in the pretensioning position. By removing the securing device, in particular transversely to a direction of movement of the impact section, this can be released again. In this state, the spring force stored in the spring section can be released and the impact section can be moved towards the impact ignition element, in particular on a circular or at least substantially circular, in particular part-circular, movement path. In this way, the percussion ignition device can be triggered in that the percussion section strikes against the percussion ignition element of the percussion ignition device when moving from the pretensioning position to the relaxation position. According to the invention, the relaxation position is defined as a position in which no more spring force is stored in the spring section. The triggering device is preferably designed and can be arranged at the assembly point in such a way that the impact section strikes the impact ignition element between the pretensioning position and the relaxation position. In this way, premature braking of the impact section before contacting the impact ignition element can be avoided and thus the triggering reliability of the triggering device can be improved.

The triggering device according to the invention has the special feature that the impact section, the spring section, the fastening section and the securing section are monolithic and thus formed in one piece. In the context of the invention, one-piece means that the impact section, the spring section, the fastening section and the securing section are permanently connected to one another. It can be provided that the impact section, the spring section and the fastening section are made of different materials. In this way, materials can be selected according to their function and thus material costs can be saved. Metals and plastics can be provided as preferred materials according to the invention. Furthermore, a one-piece design has the advantage that assembly of the release device on an oxygen candle or a percussion ignition device or a respiratory protection device is improved.

According to the solution, the impact section, the spring section, the fastening section and the securing section are monolithic. In the context of the invention, a monolithic design is understood to mean that the impact section, the spring section, the fastening section and the securing section are made from a shell. Furthermore, the striking section, the spring section, the fastening section and the securing section are produced in such a way that they are connected to one another in one piece during the entire production process. Separation and joining processes of the impact section, spring section, fastening section and securing section are therefore not required. It can be provided that the impact section, the spring section, the fastening section and the securing section are subjected to different local heat treatment processes in order to thus achieve different structural configurations. A monolithic design has the advantage that it is no longer necessary to assemble the impact section, the spring section of the fastening section and the securing section. Assembly of the triggering device according to the invention is thus limited to pretensioning the spring section into the pretensioning position and inserting the safety device. In addition, the release device can be easily and simply mounted on the percussion ignition device, the oxygen candle or the respiratory protection device.

It is preferred that the release device is made from a wire or a sheet metal. The impact section, the spring section and the fastening section are preferably produced by one or more deformation processes. Such a release device can be produced with simple means and inexpensively.

The fastening section is preferably designed in the shape of a web. A web-shaped design is understood in particular to mean that the fastening section has a rectangular or trapezoidal or disk-shaped, in particular part-disk-shaped, cross section. The fastening section particularly preferably has two opposite parallel sides. A web-shaped fastening section has the advantage that a relative rotation of the release device to the assembly point can be avoided in a form-fitting manner. The release device can thus be arranged in a rotationally secure manner at the assembly point. In addition, the assembly of the release device at the assembly point can be improved, since a web-like design favors a translational or essentially translational assembly direction.

The spring section is further preferably designed in a spiral shape. In this way, a particularly advantageous spring force can be provided. The spring section is particularly preferably designed as a double spring, the flapping section being arranged between two, preferably identical or mirror-inverted, spring elements of the double spring. This has the advantage that a particularly advantageous trajectory of the impact section can be achieved between the pretensioning position and the relaxation position. Unintentional turning away of the impact section around it The longitudinal axis and relative to the percussion ignition device can thus be avoided.

According to the solution, the triggering device has a securing section for holding the striking section by means of the securing device in the pretensioning position. The spring section is preferably arranged between the securing section and the striking section. More preferably, the securing section is designed to clamp the securing device with the tensioned impact section. Furthermore, it is preferred that the securing section is designed in one piece or monolithically with the striking section, the spring section and the fastening section. The securing section preferably has a slip safeguard in order to prevent the securing device from sliding off the securing section, in particular in a form-fitting manner. By means of a securing section, a hold of the securing device for securing the impact section in the pretensioning position can be improved in an advantageous manner and with simple means.

According to the solution, the securing section has two counterholders for clamping the impact section by means of the securing device in the pretensioning position, the impact section being arranged between the counterholders in the pretensioning position. The counterholders are preferably arranged in such a way that a compressive force exerted by the prestressed impact section on the securing device can be evenly distributed to the counterholders. Furthermore, the counterholders are arranged in such a way that at least part of the impact section can be guided through between the counterholders when tensioning from the relaxed position into the pretensioned position. Such a securing section has the advantage that securing the impact section in the pretensioning position by means of the securing device is improved with simple means and inexpensively.

According to a second aspect of the invention, the object is achieved by a percussion ignition device for an oxygen candle for a respiratory protection device. The percussion ignition device has a percussion ignition element, an assembly point and a triggering device arranged at the assembly point. According to the invention, the release device is designed according to a release device according to the invention.

The impact ignition device preferably has a mounting section for mounting the impact ignition device on a counter mounting section of the oxygen candle. The mounting section can for example have a thread, in particular an internal thread. The percussion ignition device preferably has an ignition chamber in which, for example, a barium peroxide-iron powder mixture is or can be arranged. The barium peroxide-iron powder mixture arranged in the ignition chamber can be ignited by means of the percussion ignition element actuated by the triggering device.

In the case of the percussion ignition device according to the invention according to the second aspect of the invention, the same advantages result as have already been described above for a triggering device according to the first aspect of the invention. Accordingly, the impact ignition device according to the invention has the advantage over conventional impact ignition devices that the impact section, the spring section and the fastening section of the triggering device are formed in one piece. A one-piece design has the advantage that assembly of the triggering device on the percussion ignition device is improved. The production costs of the percussion ignition device can thus be reduced.

It is preferred according to the invention that the assembly point has a latching device for securing the fastening section at the assembly point. Furthermore, it is preferred that the fastening section of the triggering device has a counter-latching section that can be brought into engagement with the latching device, the triggering device being able to be fixed at the assembly point by such engagement of the latching device in the counter-latching section. An assembly point designed in this way has the advantage that assembly and retention of the release device at the assembly point are improved with simple means and inexpensively.

According to a third aspect of the invention, the object is achieved by an oxygen candle for a respiratory protection device. The oxygen candle has a container for holding a chlorate, in particular sodium chlorate and / or lithium perchlorate, and a percussion ignition device for activating the chlorate held in the container. According to the invention, the percussion ignition device is designed in accordance with an impact ignition device according to the invention.

The percussion ignition device is preferably detachably held on the container in order to enable the chemicals arranged in the container to be exchanged. By means of the percussion ignition device, the chemicals arranged in the container can be activated or ignited, so that they release oxygen, which is supplied by a respirator wearer of the respirator via a breathing hose and a breathing mask, a mouthpiece or the like directly or via other components of the breathing apparatus, in particular a mixing chamber for mixing filtered air that is breathable.

The oxygen candle according to the invention according to the third aspect of the invention has the same advantages as have already been described above for a triggering device according to the first aspect of the invention and a percussion ignition device according to the second aspect of the invention. Accordingly, the oxygen candle according to the invention has the advantage over conventional oxygen candles that the striking section, the spring section and the fastening section of the triggering device are formed in one piece. A one-piece design has the advantage that assembly of the triggering device on the percussion ignition device is improved. Thus, the manufacturing cost of the oxygen candle can be reduced.

Figure list

• 1 eine Seitenansicht einer bevorzugten Ausführungsform einer erfindungsgemäßen Auslösevorrichtung,
• 2 eine perspektivische Ansicht der Auslösevorrichtung aus 1, und
• 3 eine Seitenansicht einer bevorzugten Ausführungsform einer erfindungsgemäßen Sauerstoffkerze.

Further measures improving the invention emerge from the following description of some exemplary embodiments of the invention, which are shown in the figures. All of the features and / or advantages arising from the claims, the description or the drawing, including structural details and spatial arrangements, can be essential to the invention both individually and in the various combinations. They each show schematically:

• 1 a side view of a preferred embodiment of a triggering device according to the invention,
• 2 a perspective view of the trigger device from 1 , and
• 3 a side view of a preferred embodiment of an oxygen candle according to the invention.

Elements with the same function and mode of operation are in the 1 to 3 each provided with the same reference numerals.

In 1 is a preferred embodiment of a release device according to the invention 1 shown schematically in a side view. 2 shows the same trigger device 1 schematically in a perspective view. The trigger device 1 has a fastening portion 4th for attaching the release device 1 at an assembly point, especially an oxygen candle 3 (see. 3 ), on. In addition, the release device 1 a stroke section 5 for striking against a percussion ignition element of a percussion ignition device 2 (see. 3 ), on. The stroke section 5 is on a spring section 6th the release device 1 arranged.

In 1 and 2 is the stroke section 5 in a relaxation position E. arranged in which the spring section 6th is completely relaxed. Furthermore, in 1 is the stroke section 5 in a preload position V indicated by dashed lines. In the preload position V the spring section is biased. Finally, the release device 1 a fuse section 8th with two spaced apart counterholders 9 on. The fastening section 4th , the beat section 5 , the spring section 6th and the fuse section 8th are monolithic. A safety device 7th the release device 1 is between the counterholders 9 and the one in the preload position V arranged impact section 5 arranged to move the flapping portion 5 into the relaxation position E. prevent positive fit. The safety device 7th is a separate component of the release device 1 , which is not in one piece or not monolithic with the fastening section 4th , the stroke section 5 , the spring section and the securing section 8th is trained. Furthermore, the safety device 7th releasable between the securing section 8th and the flapping section 5 held and, for example, laterally pulled out of the position shown to the triggering device 1 trigger.

3 shows a preferred embodiment of an oxygen candle according to the invention 3 schematically in a side view. The oxygen candle 3 assigns a container 10 on, which is designed for the absorption of chemically bound oxygen, such as sodium chlorate and / or lithium perchlorate. At one open end of the container 10 is a percussion igniter according to the invention 2 with a release device according to the invention 1 arranged. The safety device 7th is in the state shown on the release device 1 held detachably so that the non-recognizable impact section 5 in the preload position V is arranged.

List of reference symbols

1

Release device

2

Percussion igniter

3

Oxygen candle

4th

Fastening section

5

Impact section

6

Spring section

7th

Safety device

8th

Fuse section

9

Counterholder

10

Container

E.

Relaxation position

V

Preload position

Claims (7)

Triggering device (1) for actuating a percussion ignition device (2) of an oxygen candle (3) for a respiratory protection device, having a fastening section (4) for fastening the triggering device (1) to an assembly point, a percussion section (5) for striking against a percussion ignition element of the percussion ignition device ( 2), a spring section (6) for moving the impact section (5) between a pretensioning position (V) and a relaxation position (E), a securing device (7) for securing the impact section (5) in the pretensioning position (V) and a securing section ( 8) for holding the impact section (5) by means of the securing device (7) in the pretensioning position (V), the securing section (8) having two counterholders (9) for clamping the impact section (5) by means of the securing device (7) in the pretensioning position ( V), the impact section (5) being arranged in the pretensioning position (V) between the counterholders (9), dadur ch characterized in that the impact section (5), the spring section (6), the fastening section (4) and the securing section (8) are monolithic. Release device (1) Claim 1 or 2 , characterized in that the release device (1) is made from a wire or a sheet metal. Release device (1) according to one of the preceding claims, characterized in that the fastening section (4) is web-shaped. Tripping device (1) according to one of the preceding claims, characterized in that the spring section (6) is designed in a spiral shape. Impact ignition device (2) for an oxygen candle (3) for a respiratory protection device, comprising an impact ignition element, an assembly point and a triggering device (1) arranged at the assembly point, characterized in that the triggering device (1) as a triggering device (1) according to one of the Claims 1 to 4th is trained. Percussion igniter (2) after Claim 5 , characterized in that the assembly point has a latching device for securing the fastening section (4) at the assembly point. Oxygen candle (3) for a respiratory protection device, comprising a container (10) for holding a chlorate, in particular sodium chlorate and / or lithium perchlorate, and an impact ignition device (2) for activating the chlorate contained in the container (10), characterized in that the impact ignition device (2) as percussion ignition device (2) Claim 5 or 6th is trained.

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