Abstract: A direct current motor having a fixed stator coil module and a magnetic rotor that can be rotated around the perimeter of said module and forming an impeller at the same time. The coils, terminal and electric connecting lines as well as upstream motor control and voltage converter modules are embedded in a non-conductive casting compound. Power is supplied from an intrinsically safe accumulator or battery pack at a voltage that is still considered intrinsically safer using a higher current value to match the required motor output. The filter and blower unit can be used in zone “0” potentially explosive atmospheres.

Abstract: A blow filter device for breathing masks and hoods, comprising a blower which is driven by a motor and at least one filter which is arranged upstream from the blower, in addition to an electronic control system for adjusting a predefined airflow volume. The invention is characterized in that the motor is an electronically commutated direct current motor (6) which is controlled with the aid of a pulse width modulation ratio as a control variable, wherein a calibrating curve is created and stored in the memory (14) of the electronic control system and is based on a plurality of different filter resistances and a respectively corresponding pulse-width modulation ratio (PWM) and the respective motor speed (n) for a specific volume of air.

Abstract: An apparatus for supporting a compressed-air bottle. The apparatus has a bottle support, a plurality of glide inserts projecting away from the bottle support and engageable with a compressed-air bottle supported on the apparatus, and a tightening strap for exerting a force on a compressed-air bottle supported by the apparatus. The tightening strap draws a compressed-air bottle against the glide inserts so that the glide inserts are repositioned relative to the bottle support.

Abstract: In a compressed air breathing apparatus, a single combined high/medium-pressure line (8) consisting of a medium-pressure hose and a coaxial, flexible high-pressure line inside said hose is integrated into the pressure reducer (5) connected to a compressed air bottle so that said line can rotate in axial direction. The free end of the combined high/medium-pressure line (8) can also rotate in axial direction when connected to a manifold block (9) for distributing the supplied high or medium-pressure air to connections for a lung machine (11), a pressure gauge (15), and an alarm whistle (17) that is controlled at high pressure and operated at medium pressure. The manifold block (9) is equipped with an additional high-pressure fast-fill connection (14) and an additional medium-pressure connection (13). A compressed air breathing apparatus of this design is simple, convenient, and safe to handle.

Abstract: In a respirator mask in which the visor panels can be covered by light-absorbing supplementary panels, first and second snap-in hooks are molded onto opposite sides of the visor panel and a stop is molded onto a corner section to form a guide pocket. The outer contour lines and the convexity of the visor panel and the supplementary panel are identical. To attach the flexurally elastic supplementary panel, it is first fastened in the guide pocket and on the first snap-in hook. Then the opposite side is locked into the second snap-in hook after flexing the supplementary panel.

Abstract: An infrared sensor for gas metering appliances consisting of a metering chamber with an infrared source and an infrared sensor. The metering chamber is connected to the atmosphere via an anti-dust and anti-damp filter. The metering chamber is arranged in a protective housing having gas inlets and outlets. Connection to the metering chamber via a gas exchanger orifice and an anti-dust and anti-damp filter is not of a pressure-proof design based on normal pressure conditions. The infrared source and the infrared detector are integrated in the wall of the metering chamber and held therein. The infrared source is a lamp. The infrared source and infrared detector have a fail-safe power supply.

Abstract: Apparatus for dosing gaseous and/or vaporous substances An apparatus for dosing gaseous and/or vaporous substances, in particular for generating varying scents, includes a multitude of packaged storage containers (1) from which different gases and/or vapors are driven out by a carrier medium. On their inlet sides, the storage containers are connected to a common carrier medium manifold (13) via a shut-off device (4) assigned to each storage container that can be actuated, and on their outlet sides to a joint homogenization chamber (8). Both the carrier medium manifold and the homogenization chamber are connected to a carrier medium source using a regulating valve (5, 9). Check valves (6, 7) are integrated in the gas passages to the storage container and from the storage container to the homogenization chamber. A dosing apparatus designed based on this principle is characterized by low space requirements and materially separate volume flows that can be exactly timed and dosed.

Abstract: A holding device for a breathing mask that is fastened to a protective helmet when in use includes a fastening hook connected to a flexible, length-adjustable tightening strap that is hooked into a receptacle on the protective helmet. Stop elements that are both frictionally engaged and in positive contact prevent the accidental release of the fastening hook together with the flexibility of the tightening strap that at the same time ensures an individually adjustable fit of the mask while sliding elements arranged at an offset to the stop elements ensure automatic optimum orientation of the tightening straps. The tightening strap and the fastening hook are coupled using a retainer piece molded to the tightening strap that is held in positive contact in the recess of a grip end connected with the fastening hook.

Abstract: A circuit arrangement for the time-delayed startup of electronic modules (20) connected to a module carrier (1) comprises a comparator (28) provided with a reference voltage applied thereto and an operating voltage which is applied via charging capacitors (35 to 38) with different capacitances. The terminals (4c-f to 19c-f) for the charging capacitors are integrated in different combinations into the terminals (4a,b to 19a,b) on the module carrier for the operating voltage. The startup time-delay is determined on the basis of the different time intervals resulting from the different values of the capacitances and lasting until a voltage exceeding the reference voltage is achieved, whereupon the respective electronic module is connected to the voltage source by means of the comparator in a time-delayed manner.

Abstract: A support frame for a respiratory air container that can be adjusted to the torso length of a user. The support frame has a support plate with shoulder straps and to which at least one respiratory air container is fastened and from which pneumatic and electric supply lines originate. An extension plate is provided on the support plate and can be moved in a longitudinal direction and locked into various positions with supply lines attached to it. Shoulder straps can be fastened to a support free end of the extension plate.

Abstract: The first step of a method for manufacturing polymer-bonded filter bodies is to produce a mixture of a sorptive agent, a liquid, and a polymer. This mixture is then pressed into a filter body by being placed in a compression mold and simultaneously applying a hot gas to it. The evaporation temperature of the liquid is lower than the melting temperature of the polymer while the temperature of the hot gas flowing through the mixture exceeds the evaporation temperature of the liquid. This inexpensive method can provide homogeneously structured high-performance filter bodies.

Abstract: The invention relates to a volumetric control for blower filter devices in which a control unit (5) determines a differential pressure between measuring points (1, 2) that is converted into a control signal for the fan output. To this end, at least two measuring points (1, 2) are arranged in the airflow behind the fan impeller (3) and in front of the consumer, in particular, the breathing hood (4). The measuring points (1, 2) can be located in the airflow inside the case filter device behind the impeller wheel (3) and in front of the outlet of the blower filter device or one measuring point is placed in the airflow inside the housing of the case filter device behind the impeller wheel (3) and one is placed in the vicinity of the connection of the breathing hood (4) or both measuring points are located in the breathing hose (8).

Abstract: A monitoring and warning system for firefighters and other people exposed to similar hazards includes mutiple monitoring, warning and control devices (1, 9 through 16) and a telemetric module (17) for transmitting information data to a base station and for receiving commands. All units of the system are connected seperately to a common—open-type or closed-type—bus (8) and configured either for master-slave or for master-master operation. The system operates on simple and efficient connections, more units can be added easily, it is fast and faultless and can also be used in areas subject to explosion hazards.

Abstract: A strap for respirator masks comprises a head strap piece, made from elastically flexible synthetic material, with a strap fixing piece and a head plate with a greater wall thickness than the attached head straps. A neck strap, connected to the mask at two fixing points and an extending temple strap, which may be introduced in a detachable and length adjustable manner into fixing clips attached to the head straps, are fixing to the strap fixing piece. The head strap piece thus consists of a straight and a curved piece. The crown-shaped embodiment with the elastic temple band is associated with good fitting and wearing properties and low maintenance requirements.

Abstract: The supporting plate (1) of a harness for breathing tanks and the like is flexibly connected to a waist plate (2) using an elastic formed piece (3) meant to keep said waist plate (2) on the user's back and resiliently respond to impacts, contortion, and tilting, and the link of the supporting plate and waist plate provided using the formed piece is positive-locking around a connecting pin (5a) in the direction of rotation of the plates against each other.

Abstract: The invention relates to a head harness for a respirator which comprises a head plate (1) that is elastic in the X direction and that is substantially nonelastic in the Y direction. Front straps (2), temple straps (3) and neck straps (4) are fastened to the head plate, only the temple and the neck straps being extensible. The strap buckles (5) provided for fastening the front and temple straps to the mask base are rigidly adjusted according to the head size so that the mask is already correctly positioned and preliminarily fixed when put on and only the neck strap has to be readjusted. The head harness can be adapted to different head shapes and sizes and allows for a high wearing comfort. The respirator can be quickly and easily put on.

Abstract: In a piezoelectric acoustic alarm piezoelements (2a, 2b) each excited by a square-wave voltage are arranged opposite each other in a resonance cavity (1) and each oscillate in opposing directions. The two square-wave voltages (Va, Vb) controlled by a microprocessor (8) are phase displaced by a square-wave pulse length and are positive or negative. A piezo-sound source designed and excited in this way is characterised by a high sound volume with low current consumption and small size.

Abstract: This invention relates to a gas sensor arrangement in which one or more gas sensors (4) are placed into rooms for monitoring or measuring gas or vapor concentrations or mixtures, a diffusion body (5) is placed in front of the gas sensors (4), the responsiveness of the gas sensors is impaired by structural design or contamination and/or the gas atmosphere is static. The sensor (4) or sensors (4.1 to 4.n) are placed in, on, or in front of a duct (1) located in the room and thus are within the flow area of said duct (1), and a flow is present in the duct (1) during measuring or monitoring. The duct can be artificially heated using a heater (6) to generate this flow.