Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1994-05-17
1996-11-19
Cummings, Scott
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277184, 494781, 494901, F16J 1553
Patent
active
055754856
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
Gaskets for motor vehicles are known, for example from Italian Patent No. 1,017,502 and Italian Utility Model No. 21692 8/83 in the name of the present applicant, which are suitable for forming a seal between the vehicle body and openable parts of the bodywork, such as doors, hatches, hood and the like when these are closed, of the type comprising a deformable profiled strip able to be fixed to the vehicle body by snapping-on, to said profiled strip there being connected along the straight regions of engagement between the vehicle body and the openable part a tubular section divided into a pair of separate adjacent chambers, one of which acts as a bellows air chamber and the other as a seat for magnetized material.
These magnetic gaskets represent considerable progress over compression-operated gaskets without a magnetic seal, in terms both of improved sealing and of lesser pulling action to effect closure.
There is however the technical problem of adapting this type of gasket to the varying range of shapes which the engagement region between the fixed and openable parts can assume, particularly in curvilinear regions, and especially when the radius of curvature is small. In very accentuated curvature regions there are considerable problems relating to deformation and squashing of the magnetic gaskets, which can result in loss of seal, formation of folds and points of discontinuity, or indeed breakage of the gasket after a certain time.
European Patent Application No. 0519565 of the present applicant proposes a gasket able to solve this technical problem. It provides a magnetic gasket for forming a seal between a fixed part and an openable part in regions of curvilinear extension, for example in particular between the body and door of a vehicle, of the type comprising a profiled strip for fixing to said parts and a chamber housing a magnetized bar, in which said profiled fixing strip and said tubular chamber for the magnetized bar are connected together by an extendable deformable tubular chamber the opposing free walls of which are substantially curvilinear and curved in the same direction.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a magnetic gasket ideally suitable for mounting in curvilinear regions even of very small radius of curvature, without the deformation stresses to which it is subjected in any way compromising the seal.
A further object is to provide the gasket with a continuous flexible magnetic bar to enable it to be shaped as a frame weldable at a single point without other weld points being required. This means that the required gasket can avoid the presence of weak points such as the welded ones more easily subjected to a potential loss of seal, infiltration, wear, breakage etc.
Further objects are to provide a gasket which can easily bend along one axis and vary its plane along the other axis, ensures good thermal insulation (and acoustic insulation in the case of motor vehicles), can be easily fitted to the parts, is of the lowest possible weight, and is able to "close" and hence exert magnetic force on possible narrow surfaces (3-5 mm in the case of motor vehicles).
These objects are attained according to the invention by a magnetic gasket particularly suitable for forming a seal between a fixed part and an openable part in regions of curvilinear extension, for example in particular between the body and door of a vehicle, of the type comprising an element for fixing to said parts and a seat housing a magnetized bar of substantially rectangular cross-section in which said fixing element and said seat for the magnetized bar are connected together by an extendable deformable tubular chamber, characterised in that said bar is magnetized along at least one of the two shorter opposing sides of its substantially rectangular cross-section, said magnetized side facing when in its operating position the part with which contact is to be made for sealing purposes.
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristics and advantages of the invention
REFERENCES:
patent: 2188091 (1940-01-01), Baermann, Jr.
patent: 3125389 (1964-03-01), Swaneck, Jr.
patent: 3159517 (1964-12-01), Schornstheimer et al.
patent: 3191106 (1965-06-01), Baermann
patent: 3248159 (1966-04-01), Hall
patent: 3710291 (1973-01-01), Nicoud
patent: 5257791 (1993-11-01), Cittadini et al.
Cittadini Paolo
Merla Adriano
Cummings Scott
Industrie Ilpea S.p.A.
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