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Individual
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Individual
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Priority to ES0028664UpriorityCriticalpatent/ES28664Y/en
Publication of ES28664UpublicationCriticalpatent/ES28664U/en
Application grantedgrantedCritical
Publication of ES28664YpublicationCriticalpatent/ES28664Y/en
An improved whistle, characterized in that it is constituted by a tubular piece, in one of whose ends is fixed the nozzle carrying the corresponding tongue, a plurality of slots or indications appearing on the surface of this tubular piece, and being internally divided into two zones, of which one is smooth walls and the other threaded, being able to move inside the said tubular piece a carrying rod in one of its extremities of a head or piston capable of sliding inside the the smooth zone and to reduce or increase the capacity of the chamber formed by said piston and the tongue of the nozzle, and said rod having a threaded area intended to be screwed to the complementary sector of the tubular piece, whose threaded area of that is attached by its end to a bush of appropriate diameter to be able to cover the grooves or indications formed on the wall of the piece bular, and being interspersed between the base of said bushing and the end or base of the latter a helical spring that surrounds the threaded area of the cursor rod. (Machine-translation by Google Translate, not legally binding)