Fluid sprinkling – spraying – and diffusing – Selectively usable or variable diverse terminal outlets – And valve controlling flow
Reexamination Certificate
1998-02-06
2001-01-16
Weldon, Kevin (Department: 1734)
Fluid sprinkling, spraying, and diffusing
Selectively usable or variable diverse terminal outlets
And valve controlling flow
C239S559000
Reexamination Certificate
active
06173909
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a transportable fire extinguishing pistol comprising a fire extinguishing nozzle-head fitted with fire extinguishing nozzles, in which the fire extinguishing nozzles are connectable to a supply pipe. Such fire extinguishing pistols are used in stationary or mobile fire extinguishing systems in which the extinguishing fluid is sprayed onto the seat of the fire by way of a fire extinguishing nozzle.
Fire extinguishing pistol of the type mentioned in the introduction is know from U.S. Pat. No. 3,704,831. With the known pistol, the nozzle head is rotatably arranged in such a way that by turning the head, the nozzle apertures arranged on the face can be brought into alignment with the outlet aperture of a fire extinguishing fluid supply-pipe. In this way, a fire extinguishing jet emanates from one of the nozzles.
In the case of the known fire extinguishing pistol, the extinguishing fluid emanates with relatively high kinetic energy. The advantage of using such an extinguishing fluid jet consists of the possibly of targeting the jet of extinguishing substance to the area of the fire covering a considerable range. In this way, among other things, the member of the fire brigade who operates the fire extinguishing plant is only exposed to a low risk of injury. In order to achieve this, in the past the water damage caused by the large quantities of extinguishing substance always required during firefighting was accepted as being inevitable.
Apart from the know fire extinguishing pistol mentioned above, from the international application WO94/25112, a fire extinguishing nozzle retainer, which is to be attached in a stationary manner, is known, in which the fire extinguishing nozzles are arranged on a bevelled, conically shaped exterior surface. The advantage of such a design of the fire extinguishing nozzle-holder consists in the ability to cover a relatively large volume of space with extinguishing fluid in short time by way of the fire extinguishing nozzles.
Apart from the traditional extinguished methods in which large quantities of extinguishing fluid are directed to the seat of the fire, it is known to use a fluid mist for extinguishing fires. By spraying such a fluid mist into the surroundings of the seat of the fire, the temperature of the gasses surrounding the seat of the fire is reduced. At the same time, the oxygen required for combustion is displaced from the surroundings of the fire. By reducing the temperature and displacing the oxygen, the fire is finally suffocated. A further particular advantage of extinguishing fires with a fluid mist consists of the fluid quantities required for extinguishing the fire being only small.
SUMMARY OF THE INVENTION
It is the object of the present invention to improve a fire extinguishing pistol of the type discribed in the introduction to such an extent that due to increased effectiveness of the fluid mist, the fluid quantity required to extinguish a fire is reduced.
According to the invention, this object is met in that with a fire extinguishing pistol of the type mentioned in the introduction, at the free front of the fire extinguishing nozzle-head a plural number of fire extinguishing nozzles are arranged, spaced apart in relation to each other, of which each one, when supplied with an extinguishing fluid under pressure, generates an extinguishing fluid mist; and that the extinguishing nozzles can be supplied with extinguishing fluid under pressure by way of a valve combination, as desired either individually and/or in groups.
Instead of or in addition to a central main nozzle, the invention provides for the provision of further fire extinguishing nozzles which generate a finely distributed extinguishing mist. It is possible to generate an extinguishing mist of a particular quality by selecting the individual fire extinguishing nozzles of which each one, depending on the case of application, for example can generate mist of a different type and composition; their number; their respective mode of operation; the type of supply with extinguishing fluid under pressure; and their positioning on the fire extinguishing nozzle-head. Among other things, this extinguishing mist is optimally composed with regard to the type and size of individual mist droplets contained in it.
In addition, the fire extinguishing pistol according to the invention makes it possible, during the firefighting operation, to adapt the type and composition of the extinguishing mist generated to the changing requirements as a result of progressive extinguishing success. This is achieved in that the fire extinguishing nozzles of the fire extinguishing nozzle-head can be supplied with extinguishing fluid under pressure either individually and/or in groups. In this way it is possible for example to use various fire extinguishing nozzle combinations for generating an extinguishing mist composed of a wide spectrum of different fluid droplets. Equally, for example with a view to cooling down the room temperature at the beginning of firefighting as quickly as possible, it is possible to generate an extinguishing mist which is composed of only a single, paricularly finely distrubuted, form of droplets. With progressing extinguishing success, this fine mist can then be supplemented with larger droplets by opening additional nozzles; for example for directly fighting smouldering fires.
Depending on the case of application, the individual fire extinguishing nozzles can be arranged in a line beside each other. This can be advantageous for those cases where uniform issue of extinguishing mist is desired over a large area. In addition, or alternatively, the nozzles can also be arranged on the circumferential line of an arc or in a complete circle.
In the case where, apart from the fire extinguishing nozzles arranged on the front, an additional main nozzle is provided from which substantial quantities of extnguishing substance can be applied if required, it is advantageous if the centre of the circle or the arc on which the nozzles are arranged, is arranged in the centre of this centrally-arranged main nozzle. Even distrubution of the extinguishing mist is also attained in that the individual nozzles are spaced apart with equal distance in respect to each other.
An advantageous embodiment in view of simple maintenance of the fire extinguishing pistol is characterised in that the fire extinguishing nozzle-head is detachably attached to a carrier unit.
Quick distribution of the extinguishing mist in a space as large as possible can be aided in that at least a certain number of fire extinguishing nozzles are arranged on a backward-slanting planar section of the face of the fire extinguishing nozzle-head. The speed with which a space volume can be filled can further be increased in that the fire extinguishing nozzle-head comprises a lateral area on which at least one additional fire extinguishing nozzle is arranged.
Further advantageous embodiments of the invention can be seen from the claims and the subsequent exemplary description below, where the invention is illustrated in more detail by means of a drawing showing one embodiment, in which like reference numerals designate the same elements:
REFERENCES:
patent: 195643 (1877-09-01), Shoop
patent: 236541 (1881-01-01), Broughton
patent: 2359455 (1944-10-01), Williamson
patent: 2364848 (1944-12-01), Hurst
patent: 2567176 (1951-09-01), Ballard
patent: 4828178 (1989-05-01), Tucker et al.
patent: 5551637 (1996-09-01), Lo
patent: 5816505 (1998-10-01), Tran et al.
patent: 3822 160 A1 (1990-01-01), None
patent: WO 92/20453 (1992-11-01), None
patent: WO 94/06517 (1994-03-01), None
Olesen Jesper Lindenberg
Sprakel Dirk
Sprakel Jan
Kamat-Pumpen GmbH & Co. KG
Weldon Kevin
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