Fluid sprinkling – spraying – and diffusing – Including valve means in flow line
Reexamination Certificate
2001-11-29
2004-06-08
Nguyen, Dinh Q. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
C239S587200, C239S587600, C239S581100, C239S285000, C169S052000, C137S459000
Reexamination Certificate
active
06745957
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fire hose nozzle comprising a safety device to prevent the fire hose nozzle from being displaced due to the action of the water supplied to the fire hose nozzle.
2. Description of the Related Art
Water under pressure suddenly enters or flows through a fire hose nozzle by fits and starts, and subjects the fire hose nozzle to forces producing pressure surges of varying intensity.
Now, owing to the action of these pressures surges, the fire hose nozzle tends to move in an erratic fashion in relation to the ground, with a risk of injury to persons or of damage to objects located in the path of the fire hose nozzle.
SUMMARY OF THE INVENTION
The present invention proposes to remedy these drawbacks and, for this purpose, the invention provides a fire hose nozzle with a safety device to prevent the fire hose nozzle from being displaced due to the action of the water. The fire hose nozzle is characterised in that the safety device includes a tubular body designed to be connected to a water supply hose. The safety device also has a butterfly disc including two coaxial trunnions pivotally mounted on the tubular body on a horizontal axis extending perpendicularly to the direction of flow of the water. The butterfly disc is movable inside the tubular body between an open position, in which the butterfly disc allows the water to flow, and a closed position, in which the butterfly disc restricts this flow. The safety device further includes an external control lever integral with one of the trunnions, and a triggering mechanism borne by the control lever and bearing against the ground for holding the butterfly disc in its open position when the control lever exerts thereon, through the action of the water flowing over the butterfly disc, downwardly directed vertical force.
Thanks to these arrangements, any risk of the fire hose nozzle according to the invention moving in relation to the ground through the action of pressure surges produced by the water is totally precluded.
As soon as the nozzle moves in relation to the ground, whether vertically, horizontally, or in some other direction, the control lever ceases, in fact, to act vertically on the triggering means. Now, in the absence of this action, the water flowing through the tubular body immediately moves the butterfly disc from its open position to its closed position, which has the result of considerably reducing the water flow rate and of thus immobilising the nozzle practically at once.
According to one particular form of embodiment of the invention, the tubular body can have a circular cross-section and be traversed, for example diametrically, by the pivotal axis of the trunnions.
Advantageously, the part of the butterfly disc that is upstream of the pivotal axis of the trunnions, in relation to the direction of flow of the water, is directed downwards.
As the upstream part of the butterfly disc is inclined downwards, the water has a greater effect thereon, and can thus move it quickly from its open position to its closed position as soon as the triggering means ceases to be subjected to the action of a vertical force.
Preferably, the fire hose nozzle according to the invention comprises a stop which, when the water is not flowing, holds the butterfly disc in a rest position in which the triggering means is removed from the ground.
Thanks to this stop, the triggering device thus remains above the ground when the water is not flowing, and there is thus no risk of its being soiled or damaged when the nozzle is not in use.
The stop can advantageously be borne by the part of the butterfly disc that is downstream of the pivotal axis of the trunnions, in relation to the direction of flow of the water, and bear against the inner face of the tubular body to hold the butterfly disc in its rest position.
The stop is actually inside the body of the nozzle, and hence the stop is perfectly protected from any risk of damage from the outside.
To facilitate manufacturing operations and to reduce the cost price of the fire hose nozzle, the control lever can be provided with an orifice parallel to the pivotal axis of the trunnions, while the triggering device can consist of a rod ending in a hook inserted into the orifice in the control lever.
The rod can, furthermore, have, at its end opposed to that of the hook, an end-piece bearing against the ground when the butterfly disc is in open the position.
For an operator to be able to return the butterfly disc easily to its open position, the control lever can advantageously include an operating handle at its end opposed to that of the triggering means, with the operating handle then extending obliquely upwards when the butterfly disc is in its open position.
REFERENCES:
patent: 1995299 (1935-03-01), Foulds
patent: 2002451 (1935-05-01), Gray
patent: 3972364 (1976-08-01), Brumm
patent: 5174547 (1992-12-01), Vuillermoz
patent: 5593092 (1997-01-01), McMillan et al.
patent: 2123142 (1995-11-01), None
patent: 10-295843 (1998-11-01), None
Casella Anthony J.
Hespos Gerald E.
Nguyen Dinh Q.
St-Mihiel S.A.
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