Pressure capsule for spray can, and spray can which utilizes such a capsule
First Claim
1. In a spray can (19) having a liquid (18) to be expelled, a pressure capsule fixedly mounted in the spray can, the capsule comprising first and second chambers (2, 3), the first chamber being filled with a first fluid under a first pressure and the second chamber being filled with a second fluid under pressure approximately equal to an overpressure present in the spray can for expelling the liquid (18), the first pressure being higher than the overpressure;
- a valve (4) in a wall of the first chamber (2);
a membrane (5) forming a wall of the second chamber and controlling the valve (4);
a removable element (6) for maintaining the valve (4) in a closed position when the removable element is in its non-removed condition, wherein the capsule can be prepressurized when the removable element is in its non-removed condition.
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Accused Products
Abstract
Pressure capsule for spray can, characterized by the fact that it principally consists of at least two chambers (2, 3), the first of which (2) is intended to be filled with fluid under relatively high pressure and the second of which (3) is intended to be filled with a fluid up to a pressure equal or practically equal to the overpressure which normally exists in a spray can (19) and which is needed for expelling a liquid (18); in the wall of the second chamber (3), a membrane (5) that can control the valve (4); and a removable element (6) that, in its unremoved condition, keeps the valve (4) closed.
173 Citations
32 Claims
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1. In a spray can (19) having a liquid (18) to be expelled, a pressure capsule fixedly mounted in the spray can, the capsule comprising first and second chambers (2, 3), the first chamber being filled with a first fluid under a first pressure and the second chamber being filled with a second fluid under pressure approximately equal to an overpressure present in the spray can for expelling the liquid (18), the first pressure being higher than the overpressure;
- a valve (4) in a wall of the first chamber (2);
a membrane (5) forming a wall of the second chamber and controlling the valve (4);
a removable element (6) for maintaining the valve (4) in a closed position when the removable element is in its non-removed condition, wherein the capsule can be prepressurized when the removable element is in its non-removed condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
- a valve (4) in a wall of the first chamber (2);
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26. Pressure capsule fixedly mounted in a spray can, comprising:
- first and second chambers (2,
3), the first chamber of which (2) is intended to be filled with a fluid under a first pressure and the second chamber (3) which is intended to be filled with a fluid that is under a pressure which is up to a pressure equal or practically equal to the overpressure that is present in a spray can (19) and which is needed for expelling a liquid (18), the first pressure being higher than the overpressure;
in the wall of the first chamber (2) a valve (4);
in the wall of the second chamber (3) a membrane (5) that can control the valve (4); and
a removable element (6) which, in its non-removed condition, keeps the valve (4) closed, the removable element (6) being made of a material having a melting temperature of 30 to 50 degrees Celsius. - View Dependent Claims (27)
- first and second chambers (2,
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28. Pressure capsule fixedly mounted in a spray can, comprising:
- at least two chambers (2,
3), the first chamber of which (2) is intended to be filled with a fluid under a first pressure and the second chamber (3) which is intended to be filled with a fluid that is under a pressure which is up to a pressure equal or practically equal to the overpressure that is present in a spray can (19) and which is needed for expelling a liquid (18), the first pressure being higher than the overpressure;
in the wall of the first chamber (2) is a valve (4);
in the wall of the second chamber (3) is a membrane (5) that can control the valve (4); and
a removable element (6) which, in its non-removed condition, keeps the vale (4) closed, the removable element (6) being produced of a material that is soluble in the liquid (19) of the spray can (19) for which the capsule (1) is intended. - View Dependent Claims (29, 30)
- at least two chambers (2,
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31. Method of making a capsule for insertion into a spray can, comprising:
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a) forming a pressure capsule with first and second pressure chambers, b) filling the first chamber with a first fluid under a first pressure higher than an overpressure present in the spray can when filled with liquid for expelling a liquid, c) filling the second chamber with a second fluid under a pressure approximately equal to the overpressure, (d) forming a valve in a wall of the first chamber, (e) forming a wall of the second chamber of a membrane, the membrane cooperating with the valve, (f) placing a removable element on the capsule, g) after filling the chambers with fluid, placing the capsule in the spray can wherein the capsule is fixedly connected in the spray can. - View Dependent Claims (32)
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Specification