Movable or removable closures – Frame with closure feature
Reexamination Certificate
1999-11-23
2001-03-20
Stodola, Daniel P. (Department: 3634)
Movable or removable closures
Frame with closure feature
C049SDIG001, C052S204100
Reexamination Certificate
active
06202353
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an aluminium section member assembly with a thermal bridge gap for window and door frames.
Prior aluminium section members, including a thermal bridge gap, for making window and door frames conventionally comprise an outer section member made of extruded aluminium and an inner section member also made of extruded aluminium, which are rigidly coupled to one another by coupling strips or small bars made of a thermally insulating synthetic material, usually a polyamide material. These prior strips operate to provide a mechanical coupling between the two extruded aluminium section members, while interrupting the thermal conductibility between the two metal section members.
The coupling between the outer section member and inner section member, provided by using the above two strips, generates, between the two metal section members, a chamber defined by said two strips and by that region of the two metal section members which is arranged between said strips.
Inside the mentioned chamber convective hot and cold air flows can be generated, depending on the time or seasons, which practically provide a thermal transmission between the two metal section members.
The above mentioned thermal transmission, even if is comparatively small, causes a some amount of heat to flow between the outer metal section member and inner metal section member.
In order to solve this problem, a prior method provides to fill-in into said inner chamber, as the outer section member and inner section member are coupled, a thermally insulating material, of any desired suitable natures, such as, for example, polyurethane foamed materials, cast resin materials, plastic material films and the like.
This method allows to eliminate, or reduce, the thermal transmission between the metal section members: however, it requires specifically designed section members, which must be provided with different characteristics, both from a technical standpoint and from an economical standpoint and actually, prior section members for solving the above mentioned problems have been found to be greatly expensive, since they require comparatively long making steps.
SUMMARY OF THE INVENTION
Accordingly, the aim of the present invention is to solve the above mentioned problem, by providing an aluminium section member assembly, with a thermal bridge gap, which is specifically designed for window and door frames, in which is fully eliminated a possible thermal transmission between the metal outer section member and inner metal section member, due to convective motions in the inner chamber, without requiring complex constructional operations or modifications of a conventional section member making line of the type conventionally used for making thermal bridge gap section members.
Within the scope of the above mentioned aim, a main object of the present invention is to provide such a section member assembly allowing to greatly improve the thermal insulation of the component section members thereof, without the need of specifically designing special section members and without any increase of the making cost.
Another object of the present invention is to provide such a section member assembly which, owing to its constructional features, is very reliable and safe in operation.
Yet another object of the present invention is to provide such an aluminium section member assembly, with a thermal bridge gap, which can be easily made starting from easily available elements and materials and which, moreover, is very competitive from a mere economic standpoint.
According to one aspect of the present invention, the above mentioned aim and objects, as well as yet other objects, which will become more apparent hereinafter, are achieved by an aluminium section member assembly, with a thermal bridge gap, specifically designed for window and door frames and the like, comprising an outer section member and an inner section member which can be coupled to one another by at least two strips made of a thermally insulating synthetic material.
The mentioned two strips and that region of the section members arranged between said two strips define an inner chamber, characterized in that in said chamber a filling body made of a thermally insulating synthetic material is arranged.
REFERENCES:
patent: 3798869 (1974-03-01), Nipp
patent: 4069631 (1978-01-01), Nahr
patent: 4395862 (1983-08-01), Jager et al.
patent: 4815245 (1989-03-01), Gartner
patent: 4831780 (1989-05-01), Bockwinkel
patent: 5414962 (1995-05-01), Forbis et al.
patent: 6035596 (2000-03-01), Brunnhofer
Cohen Curtis A.
Hedman & Costigan ,P.C.
Stodola Daniel P.
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