Valve structure for a sack or the like to be filled with air

Fluid handling – Inflatable article – Removable valve head and seat unit

Patent

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Details

137223, 137599, F16K 1520

Patent

active

052751970

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a valve structure for a sack or the like to be filled with air, which valve structure comprises an essentially cylindrical tubular part extending hermetically from the inside to the outside of the sack and having external threads on the portion outside the sack, a plug with internal threads to be screwed on the external threads of the tubular part to close the end of the tubular part hermetically, and a filling valve in the middle of the plug.
Especially at sea transports, air-filled stowage sacks are used to fill empty spaces between the cargo or between the cargo and the wall of the hold of the ship. A stowage sack prevents the cargo from moving in the hold and facilitates particularly the supporting of an unsymmetrical difficult cargo. The stowage sack is arranged in place empty and it is filled in its place, whereby it expands and adjusts itself to the form of the cargo. When unloading the cargo, the stowage sacks are emptied and removed from between the cargo.
For the use of stowage sacks, it is extremely important that the sacks can be filled and emptied quickly and easily. This is again influenced by the valve structure used in the first place. A prior art valve structure comprises a cylindrical mouthpiece hermetically inserted in a hole of a sack and provided with eternal threads. On this mouthpiece is screwed a plug provided with respective internal threads, which plug closes the end of the mouthpiece hermetically. In the middle of the plug, on its upper surface, is arranged a filling valve, through which the sack can be quickly filled with compressed air by using a special tool. After the sack has been filled, this valve is secured by arranging a special stopper therein. The air is removed from the sack by unscrewing the plug from the mouthpiece. Unscrewing the plug and especially screwing it back for refilling is, nevertheless, a difficult measure, particularly if the worker wears protective gloves. If the plug is not entirely removed from the mouthpiece, the air flows out between the plug and the mouthpiece, but too slowly, as far as the practical needs are concerned.


SUMMARY OF THE INVENTION

The object of the invention is to provide a valve structure, by means of which a sack can be emptied as simply and quickly as possible.
This is achieved by means of a valve structure of the type presented in the prior art preamble, which valve structure is according to the invention characterized in that the plug has several air exhaust holes within the area surrounding the filling valve, and that at the end of the tubular part facing the plug there is an inner, preferably annular flange part, the upper surface of which is hermetically pressed against the lower surface of the plug closing the exhaust holes of the plug, when the plug is entirely screwed in its place. The pitch of the external and internal threads is preferably such that in order to open the passage of air from the sack the plug shall be turned one turn at the most.
In the valve structure of the invention, the air can be removed from the sack by turning the plug only that much that said flange part does not close the passage of air any more, whereby the air flows out quickly through the exhaust holes. Thanks to the invention, it is necessary to unscrew the plug, and therefore it is easy to empty the sack, and a reuse of the sack does not require any inconvenient location procedure, as according to the solution of the prior art. In this manner a valve structure has been provided, which is easy to handle also with protective gloves or mittens on.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in greater detail by means of an exemplifying embodiment with reference to the enclosed drawing, in which
FIG. 1 shows an exploded view, partially in cross-section of a valve structure according to the invention,
FIG. 2 shows a top view of the plug of the valve structure of FIG. 1.
FIG. 3 shows an exploded view, partially in cross section, of another valve structure accordi

REFERENCES:
patent: 588779 (1897-08-01), Reinach
patent: 1255354 (1918-02-01), Tischer
patent: 2772692 (1956-12-01), Russell
patent: 2804085 (1957-08-01), Geambeardino et al.
patent: 3289694 (1966-12-01), Frye
patent: 3785395 (1974-01-01), Andreasson
patent: 3944084 (1976-03-01), Reeves
patent: 3983907 (1976-10-01), Sorensen
patent: 3995653 (1976-12-01), Mackal et al.
patent: 4015622 (1977-04-01), Pagani
patent: 4579141 (1986-04-01), Arff

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