Nozzle for fire service

Abstract

A jet pipe for fire service use, comprising a water inlet end (7) and a jet shape adjustment device (1) at the water outlet end (9), by means of which a free jet emerging from the water outlet end (9) can be varied in its concentration between a more or less concentrated spray jet, and can be opened and closed by a control lever (2) located on the housing (8), wherein the spray jet at the water outlet end (9) can be continuously adjusted from 0° to its maximum angle by pivoting the control lever (2) about the main axis of the jet pipe relative to the handle (5), characterized in that the handle (5) is rigidly connected to the jet shape adjustment device (1) via a cross member (4), and the housing (8) and the cross member (4) are rotatable relative to one another about the main axis.

Description

[0001] The invention relates to a jet pipe for fire extinguishing purposes, which is designed in a new way and can be served more effectively.

[0002] Commonly used jet pipes for discharging water in the event of a fire are used by firefighters to fight fires and for self-protection during rescue operations.

[0003] The nozzles have various control elements with which the nozzle operator can make adjustments to the nozzle in order to be able to respond hydraulically to a fire situation in an optimal way, i.e. to make adjustments to the nozzle based on his experience so that a fire can be extinguished as quickly as possible using as little water as possible.

[0004] These settings concern the width of the spray angle, the flow rate and the shut-off device, ie the opening and closing of the jet pipe, which in most cases is done via a switch bracket and with which, for example, water can also be released in pulses.

[0005] Typically, the firefighter holds the nozzle, which is connected to a pressurized water hose via a hose coupling, with one hand on a handle located underneath, and makes these adjustments independently with the other hand. These controls are usually rotationally symmetrical components, especially when adjusting the spray angle.

[0006] Alternatively, existing jet pipes can also be equipped without a handle and are then operated with two hands at the same time, especially in critical interior attacks: e.g. the right hand on the open / close switch lever, the left hand on the jet shape adjustment.

[0007] In extremely dangerous, life-threatening flashover situations for the firefighter—that is, situations where a smoke explosion is imminent or has already begun—the control lever is simultaneously opened and the jet shape is rotated counterclockwise, producing a broad, extinguishing-effective spray jet with a high water output. This achieves the greatest extinguishing effect. This quickly puts the firefighter into protective mode. This procedure is taught and practiced to firefighters in fire training containers. The lower handle of the jet pipe is not required in this case—it's actually rather annoying.

[0008] However, for longer outdoor use, the lower handle is more comfortable for holding the jet pipe with the pressurized water hose for longer periods of time.

[0009] ZB DE 203 13 688 U1 is known: The description there refers to conventional jet pipes that have been in use worldwide for half a century, but in all of them, the handle (5) and control lever (2) are not rotatable relative to each other in the main axis direction. Only the nozzle, or rather the jet pipe head (1), is rotatable in the main axis direction and changes the spray jet angle. The above-mentioned utility model depicts a jet pipe without a rotatable jet pipe head, and therefore without the option of adjusting the jet angle.

[0010] Only with this invention is multifunctional operation possible via the gear lever.

[0011] The present invention is a jet pipe that can be operated more easily in a different way and takes into account the advantages and disadvantages just described.

[0012] The drawing shows: Fig. 1: Shows the jet pipe according to the invention in an isometric view. Fig. 2: Shows the jet pipe according to the invention seen from below, with indicated possible rotation of the switching lever (2) around the main axis direction. Fig. 3: Shows the cross member (4) that firmly connects the handle (5) to the jet pipe head (1).

[0013] The invention facilitates tactical deployment in such dangerous situations while simultaneously retaining the lower handle (5). The key point is that the lower handle (5) is firmly connected to the nozzle head (1) via a cross member (4), and that the housing (8) together with the cross member (4) form a rotatable bearing.

[0014] This results in the following positive, completely new effects in operating practice, or consequences: The control lever (2) not only switches forwards and backwards, thus opening and closing the spray lance, but also changes the spray angle by turning it clockwise or counterclockwise around the main axis of the spray lance. This is possible because the water inlet end (7) is firmly connected to the hose coupling (6) and, together, is mounted so that it can rotate relative to the housing (8) even under water pressure.

[0015] The forward / backward movements of the gear lever (2) and its rotation around the main axis can be superimposed simultaneously. For example, the gear lever (2), whose two brackets are screwed to the sides of the housing (8), could also be designed as a joystick or like a gearshift lever in a car.

[0016] The other hand always holds the jet pipe at the lower handle (5), and all functions, except the flow adjustment (3), can be carried out using the control lever (2) alone.

[0017] In addition to opening and closing the spray lance, the control lever (2) also controls the spray angle via the spray lance head (1), without requiring the operator to change their grip, as is the case with conventional spray lances. This is completely new.

[0018] The general, widespread state of the art is that the jet shape is adjusted as soon as the jet lance head (1) is rotated relative to the housing (8), using a handle firmly attached to the latter. The underlying jet adjustment mechanism is used in all jet lances. In this invention, the control lever (2) and handle (5) are mounted so they can rotate relative to each other. The handle (5) directly controls the jet lance head (1), which in turn changes the spray jet.

Claims

[1] A jet pipe for fire service use, comprising a water inlet end (7) and a jet shape adjustment device (1) at the water outlet end (9), by means of which a free jet emerging from the water outlet end (9) can be varied in its concentration between a more or less concentrated spray jet, and can be opened and closed by a control lever (2) located on the housing (8), wherein the spray jet at the water outlet end (9) can be continuously adjusted from 0° to its maximum angle by pivoting the control lever (2) around the main axis of the jet pipe relative to the handle (5), characterized by that the handle (5) is rigidly connected to the beam shape adjustment device (1) via a cross member (4) and the housing (8) and the cross member (4) are rotatable relative to one another about the main axis direction. [2] Nozzle for the fire service sector according to claim 1, characterized bythat the housing (8), the cross member (4) and the beam shape adjustment device (1) can be made entirely or partially in one piece.

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