Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-10-05
2000-07-11
Wu, Daniel J.
Communications: electrical
Condition responsive indicating system
Specific condition
340529, 340522, 424 40, 424 42, 102334, G08B 1900
Patent
active
060879351
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a smoke screen device for rooms and is to be used, in particular, to blind burglars in closed rooms and make them panic so they are stopped from stealing objects. Such devices can be set off by a traditional alarm or another suitable means. When setting off the device other alarm systems, of course, can also be set in operation so the owner or, if applicable, the police can take further defensive measures against the burglar(s).
Such a device is known from German document No. DE-A1-43 28 697. This system has a distributor that distributes blinding smoke like an explosive. As a basis for the production of the smoke, known components as are sometimes used in smoke grenades can be used. It is, of course, assumed that these substances are not toxic so an endangerment to health can be ruled out.
With respect to compact smoke screen devices for rooms it is also known to provide a smoke screen in a room by holding a mixture of water and glycol in a container that is heated by strong heating pipes to several hundred degrees Celsius within seconds. This procedure produces thick clouds of smoke so a burglar completely loses his orientation in a room within a very short time. For this device, however, one needs a considerable power supply; is this naturally poses the risk that the smoke screen will not occur if the power fails.
The invention is based on the technical problem of creating a simply constructed device that is essentially independent of the power supply and that can be set off, for example, by simply connecting it to an existing alarm system.
OBJECTS AND SUMMARY OF THE INVENTION
This problem is solved according to the invention by the provision of a smoke screen device for rooms, in which the device includes a container to hold a smoke fluid that produces smoke when vaporized, with a heating device for heating and vaporizing the smoke fluid, and with an opening in the container that allows the smoke to be given off into the open, wherein the heating device is a pyrotechnic heating cartridge with a heating agent, a pyrotechnic detonating agent, and a casing that encloses the heating agent and detonating agent, and the heat produced during combustion of the heating agent is given off through the wall of the casing onto the smoke fluid.
The basic idea of the invention is the construction of the active parts of the device, which are essential for creating the smoke screen, as pyrotechnic agents that can be activated independent of a power supply. Only a small primer capsule must be activated, for whose maintenance a small battery or the connection to a sensory mechanism of an alarm device is sufficient.
With a suitable form of a heating cartridge, the pressure that occurs when the mixture is heated and vaporized to produce the smoke can be sufficient to exude smoke from the container via an opening with a valve. It is nonetheless advantageous to place another pyrotechnic compression agent in the container, which is ignited either synchronously when the heating agent is ignited or later and which develops the respective propellant gases during combustion. These propellant gases stream in through a connection in the container and produce pressure there that is sufficient to cause the smoke to stream forth. The compression agent can be put in the same casing as the heating agent or it can be integrated into it. This compression agent is also, preferably, a pyrotechnic agent.
BRIEF DESCRIPTION OF THE DRAWINGS
Further forms of the invention follow from the subclaims. The invention is illustrated in greater detail in the working examples with the use of drawings. The following figures are represented.
FIG. 1 shows a longitudinal cut through a device for providing a smoke screen in rooms according to the invention.
FIG. 2 is a partial longitudinal cut similar to FIG. 1 but showing an alternative embodiment;
FIGS. 3 and 4 show a longitudinal and cross section through another working example of such a device.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In accord
REFERENCES:
patent: 3891826 (1975-06-01), Seuthe
patent: 3911823 (1975-10-01), Murray et al.
patent: 4547656 (1985-10-01), Swiatosz et al.
patent: 4859454 (1989-08-01), Barruet et al.
patent: 5410295 (1995-04-01), Lint
patent: 5647054 (1997-07-01), Jones
Berner Joachim
Frick Ulrich
Innovative Pyrotechnik GmbH
Trieu Van T.
Wu Daniel J.
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