Seal for a joint or juncture – Seal between fixed parts or static contact against... – Contact seal for other than internal combustion engine – or...
Reexamination Certificate
1999-07-01
2001-06-26
Sandy, Robert J. (Department: 3626)
Seal for a joint or juncture
Seal between fixed parts or static contact against...
Contact seal for other than internal combustion engine, or...
C277S650000
Reexamination Certificate
active
06250647
ABSTRACT:
TECHNICAL FIELD
The invention relates to a gasket and/or sealing material for use in sealing a cellular phone. The invention also relates to a method for assembling a gasket and/or a sealing material for sealing a cellular phone.
BACKGROUND
Various types of gaskets are needed in cellular phones. Their purpose is to create acoustic sealing, to prevent dust from penetrating into the phone, to provide EMI-shielding etc.
The currently employed gaskets of the above mentioned type are made of soft elastic foam plastic and sealing is obtained when the gasket is compressed. To achieve an efficient sealing the compression of the gasket must be as large as possible, i.e. the uncompressed gasket must have a considerable thickness in order to obtain a tight sealing in its compressed state. However, it may be very difficult to assemble a phone with thick gaskets since the uncompressed gaskets interfere with the mating components and therefore require excessive force to be applied.
A gasket intended for use as a fluid seal in a plate and frame apparatus, such as a heat exchanger, is disclosed in U.S. Pat. No. 5,486,010. The gasket material comprises a core of elongated and preferably expanded polytetrafluoroethylene (PTFE) contained within a tight wrap of high strength film. The gasket is pre-compressed to aid installation by forming the gasket under pressure to the desired shape. However, the densification should not be so great that further compression and fitting of the gasket cannot occur during actual installation. Sealing is only obtained at the final compression when the plates are stacked in series and mounted between frames which then are tightened by means of compression bolts.
SUMMARY
The object of the present invention is to achieve an improved gasket and/or sealing material for use in sealing a cellular phone providing a solution to the above mentioned problems and drawbacks when assembling the phone.
The object of the present invention is obtained by a gasket and/or sealing material.
Another object of the present invention is to provide a method for assembling a gasket and/or sealing material for sealing a cellular phone.
By manufacturing the gasket from slowly expanding cellular plastic, e.g., polyurethane foam (PUR), expanded polyethylene or polyvinylchloride, the gasket may be pre-compressed before assembling the phone. In this way the installation of the gasket material can be greatly enhanced by pre-compressing the gasket prior to installation. Since the gasket has the benefit of staying in its compressed state for several seconds, the phone can easily be assembled with the gasket of the invention still in its compressed, state. Not until after the phone has been assembled, the gasket expands and seals against a mating component. Preferably the gasket according to the invention is pre-compressed to more than approximately 50% of its original thickness.
REFERENCES:
patent: 4299921 (1981-11-01), Youssef
patent: 4399317 (1983-08-01), Van Dyk, Jr.
patent: 5486010 (1996-01-01), Hamilton et al.
patent: 5541813 (1996-07-01), Satoh et al.
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patent: 98/37742 (1998-02-01), None
Burns Doane Swecker & Mathis L.L.P.
Sandy Robert J.
Schwing Karlena D
Telefonaktiebolaget LM Ericsson (publ)
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