Receptacles – Closures – With closure opening arrangements for means
Patent
1980-08-26
1982-06-22
Hall, George T.
Receptacles
Closures
With closure opening arrangements for means
220281, 220315, B65D 1750, B65D 4102
Patent
active
043358268
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to release devices for containers and more particularly to devices for use in releasing the contents of a rocket-propelled projectile at a pre-determined height. It is of particular value in procuring the release of a parachute from a housing therefor fired by a rocket to a required height.
When a projectile is fired upwardly by a rocket any loose contents are pressed against the base during acceleration and this base must therefore be designed to withstand such pressure. However if the contents are subsequently to be released from the projectile the base must be designed to give way at the appropriate point.
DISCLOSURE OF THE INVENTION
The present invention relates to a container having a release device comprising a closure member, the container having an aperture therein at the edge of which is provided retaining means and the closure member being arranged to be retained by the said retaining means to obstruct said aperture.
It is characterised in that the closure member is resilient and that upon the application of a predetermined force to a central region of the closure member, flexure of the closure member occurs and it separates from said aperture.
The closure member is preferably in the form of a resilient plate having a plurality of radially directed fingers, e.g. a spider plate.
The container may be part of a rocket-launched projectile and may be used to deploy a parachute at a predetermined height. In this case a flying line is used to apply said force to pull the contents out of the container. This occurs when the line has become fully extended following launch, the other end of the line being held at the point of launch.
BRIEF DESCRIPTION OF DRAWINGS
A preferred embodiment of the present invention will now be described by way of example only with reference to the drawings of which:
FIG. 1 is a cross-sectional view of part of a container in accordance with the present invention containing a parachute and having a release device;
FIG. 2 is a plan view of a closure member in the form of a "spider plate" forming part of the arrangement shown in FIG. 1;
FIG. 3 is an exploded view of the parts of the release device of the arrangement shown in FIG. 1; and
FIG. 4 is a diagrammatic view of the container of FIG. 1 when the closure member of the release device is about to separate from the container.
BEST MODE OF CARRYING OUT THE INVENTION
Referring now to FIG. 1 there is shown a canister 10 containing a parachute pack 11. At the base end of the canister there is provided a collar 12 which has a threaded internal surface. A base ring 13 is retained by the collar 12, the base ring forming an inwardly extending flange defining an opening for subsequent release of the parachute.
A closure member in the form of a foliate-shaped plate 14 is retained by the flange. The plate is made of a resilient material such as steel. As may be seen from FIG. 2. plate 14 has the form of a "spider plate" with eight "fingers" 15. The centre of this plate has an aperture 16 through which the parachute rip cord 17 is threaded. Line 17 is made fast to the shrouding lines of the parachute contained in the canister 14. Also threaded on line 17 are a "G" washer or shim 18 and two pressure washers 19, 20 the washers 19, 20 being positioned between washer 18 and spider plate 14. Washer 18 is of such a size as to cover all parts of the spider plate 14 within the area of the opening in base ring 13 and preferably also extends within the base ring to cover at least a portion of each finger 15 over the upper surface of the base ring. Washer 18 may be of cardboard material and is preferably circular.
Of washers 19,20 the diameter of washer 20 at least is preferably no more than half that of the opening in base ring 13. Preferably this diameter is between a tenth and a third of that of the opening in the base ring. The washers 19, 20 are arranged to bear on the centre of spider plate 14 and to concentrate thereon the pull of the flying line 17 when it has reached the full length of its
REFERENCES:
patent: 3220600 (1965-11-01), Wojciechowski et al.
Prain Henry M.
Scott Andrew M.
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