EP0269323A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Sealed chambers
Assignee: Dow Silicones Belgium SPRL
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Filing: 1987-11-13
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Granted: —
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Expires: 2007-11-13
Abstract
Abstract The invention relates to chambers which are sealed against ingress of water and are provided with an element through which air may permeate to equalise pressures of air inside and outside the chamber. The element (4) is of a foamed silicone and has a cellular fine pored layer (28) of predominantly open cells having a skin (30) to be contacted by air outside the chamber. Examples of chambers described and claimed are a vehicle horn and a vehicle headlight.
Inventors
- 👤 Pierre Mokry
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:52
CPC Classifications
G; G10; G10K; G10K9/00; G10K9/18; G10K9/22; F; F21; F21S; F21S45/00; F21S45/30; F21S45/33; F21V; F21V31/00; F21V31/03
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
An article having a chamber in which a quantity of air is enclosed which chamber is sealed against ingress of water in liquid form and is provided with an element through which air may permeate under the influence of differences between the pressures of air outside the chamber and air inside the chamber, characterised in that the element is of a foamed silicone comprising a cellular layer consisting of a fine pored foam of predominantly open cells having a skin disposed to be contacted by air outside the chamber and a surface disposed in contact with air inside the chamber.
Claim 2
Dependent Claim
100 words
An article having a chamber in which a quantity of air is enclosed which chamber is sealed against ingress of water in liquid form and is provided with an element through which air may permeate under the influence of differences between the pressures of air outside the chamber and air inside the chamber, characterised in that the element is of a foamed silicone comprising a cellular layer consisting of a fine pored foam of predominantly open cells having a skin disposed to be contacted by air outside the chamber and a surface disposed in contact with air inside the chamber.
Claim 3
Dependent Claim
22 words
An article according to Claim 1 characterised in that the cellular layer has about 90% open cells and about 10% closed cells.
Claim 4
Dependent Claim
35 words
An article according to Claim 1 characterised in that the element has been formed by a process involving moulding the silicone composition to desired shape under conditions in which the composition is free to expand.
Claim 5
Dependent Claim
53 words
An article according to Claim 1 characterised in that it is in the form of a vehicle horn in which the chamber is defined by a housing in which an electromagnet is mounted and a diaphragm secured to the housing and in that the element is located in a wall of the housing.
Claim 6
Dependent Claim
55 words
An article according to Claim 1 characterised in that it is in the form of a vehicle headlamp in which the chamber is defined by a housing in which a reflector is located and a lens or glass secured to the housing and in that the element is located in a wall of the housing.
Claim 7
Dependent Claim
15 words
An article according to Claim 1 wherein the element has a density of about 140kg/m³.
Claim 8
Independent Claim
124 words
A method of providing an element in an article having a chamber in which a quantity of air is enclosed which chamber is sealed against ingress of water in liquid form through which element air may permeate under the influence of differences between the pressures of air outside the chamber and air inside the chamber, characterised in that the element is formed by moulding a foamable silicone composition to desired shape under conditions in which the composition is free to expand whereby to form a foamed silicone comprising a cellular layer consisting of a fine pored foam of predominantly open cells having a skin disposed to be contacted by air outside the chamber and a surface disposed in contact with air outside the chamber.
Claim 9
Independent Claim
124 words
A method of providing an element in an article having a chamber in which a quantity of air is enclosed which chamber is sealed against ingress of water in liquid form through which element air may permeate under the influence of differences between the pressures of air outside the chamber and air inside the chamber, characterised in that the element is formed by moulding a foamable silicone composition to desired shape under conditions in which the composition is free to expand whereby to form a foamed silicone comprising a cellular layer consisting of a fine pored foam of predominantly open cells having a skin disposed to be contacted by air outside the chamber and a surface disposed in contact with air outside the chamber.
Claim 10
Dependent Claim
14 words
A method according to Claim 7 wherein the element is moulded in situ .
References Cited (Backward Citations)
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