Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1998-10-13
2000-09-12
Gray, Linda L.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156287, 1563046, 1563099, 156358, 156499, 156517, 156556, 425108, 277314, 494791, 494951, B29C 6518
Patent
active
061172650
DESCRIPTION:
BRIEF SUMMARY
Gaskets for refrigerators made from such materials as PVC which are constituted by a base element designed to be fastened onto refrigerator door, an intermediate bellows-like chamber which secures the extension or compression motions and a seat designed to house magnetized material which realizes the tight shutting of refrigerator door by cooperating with metal edge of the refrigerator cabinet, are well known.
Such gaskets are extruded as straight profiles which are then cut into lengths according to the size of the refrigerator cabinet to which they must be applied. Said extruded profiles are cut at their ends according to an angle of 45.degree., and at these ends the so prepared lengths of profile are then joined by heat-welding in order to produce ready frames for application to the refrigerator cabinet.
SUMMARY
In general, the purpose of the method proposed by the present invention is of providing very strong heat-welded joints at the junction zones.
In order to achieve said purpose and to provide other advantages which will be clearer from the following disclosure, the present invention proposes a method for heat-welding, at the corners, lengths of profiles for sealing gaskets, for example for refrigerators of the like, of the type comprising at least one bellows-like extendible, or compressible, air chamber, with said lengths of profile being cut at their ends according to angles of 45.degree., characterized in that said method comprises the following steps: other, inside a suitable device comprising clamps which make it possible said positioning to be performed, both lengths of profile reach a softened state, completely occlude said air chamber along the choking section, closing said clamps in order to cause said pair of lengths of profile to come into mutual mating contact at their heated ends, while simultaneously injecting air into the interior of said air chamber by perforating it the region comprised between said choking section and the said end of each of said lengths of profile, so as to press the walls of the lengths of profile in that region against the walls of the clamps, thus heat-welding said ends to each other under pressure, with a third length of profile by acting in a similar way, and finally with the fourth, and last, length of profile, so as to form a gasket frame heat-welded at its corners.
BRIEF DESCRIPTION
In order to better understand characteristics and advantages of the method according to the present invention, an exemplifying embodiment thereof is reported by referring to the figures of the accompanying drawings. In no way such an example should be understood as being limitative of the scope of the invention.
FIGS. 1-5 show five sequential consecutive steps of the method according to the present invention.
FIG. 6 shows a detail of FIG. 5, and finally FIG. 7 shows a cross-sectional view of a gasket which is being heat-welded according to the method of the exemplifying embodiment, coupled with a device for Injecting air according to one of the above defined steps.
Referring to FIG. 1 of the accompanying drawings, the reference numerals (10) and (11) show two lengths of profiles foe sealing gaskets of the type shown in particular in FIG. 7.
Such a gasket of FIG. 7 comprises a base element (12) designed for being used in order to fasten the gasket, for example to the counter-door piece of the refrigerator cabinet, a bellows-like extendible, or compressible, intermediate air chamber, and finally a front seat (14) designed to receive and house a magnetized material.
Going back to FIG. 1, both lengths of profile (10) and (11) are cut, at their respective ends (15) and (16), with an angle of 45.degree..
Both lengths of profile (10) and (11) are positioned, with said ends (15) and (16) being mutually opposite, inside the interior of a suitable heat-welding device constituted by a pair of fixed clamp jaws (17) and (18), designed to cooperate with a complementary pair of mobile clamp jaws (19) and (20).
Once that both lengths of profile (10) and (11) are positioned as shown in
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Cittadini Paolo
Lovison Umberto
Gray Linda L.
Industrie Ilpea S.p.A.
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