Static molds – Including means within surface to confine heat exchange medium
Patent
1981-07-31
1983-02-08
Flint, Jr., J. Howard
Static molds
Including means within surface to confine heat exchange medium
249 95, 425121, 264259, 29C 116, B29D 2704, B29C 600
Patent
active
043725244
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to moulds enabling the production of, for example, profiled elements, panels and frames in building joinery work, of plastics material, notably of polyurethane. The invention also covers the profiled elements and the joinery thus produced.
In the field of moulding plastics materials for the production of profiled elements and of openable or fixed window- and door-frames, joinery work is at present known which is obtained by means of moulds comprising essentially two half-moulds of which each is dimensioned so as to have directly the desired profile and can include extensions for setting to the required length. It is clear that this type of mould is particularly expensive and that the product produced must then be trued, notably at the level of the joints between the extensions.
SUMMARY OF THE INVENTION
It is an object of the present invention to overcome these drawbacks by providing a mould in which the half-moulds do not include extensions and permit the production of a large variety of profiled elements for a very low cost price whilst being easy to produce.
According to the invention, in a mould for producing profiled elements of plastics material, notably of high density polyurethane with a thin construction and integral skin of the type comprising upper and lower half-moulds separated by a joint plane, respectively associated with tightening means such as the tiltable plates of a press and defining together the impression of a profiled element which can include a stiffening core, each half-mould comprises a shoe, whose outer surface includes removable fastening means and whose inner surface is parallel to the joint plane and forms the bottom of the impression, and interchangeable profile-defining members respectively fixed to the inner surface of the shoe on each side of the element to be moulded, the shoes and possibly certain profile-defining members comprising one or several passages for the circulation of a preheating and cooling fluid for keeping the temperature of formation of the moulded material at a substantially constant value.
According to other characteristics:
the shoes and the profile-defining members are constituted by a light alloy and are provided directly by extrusion;
the profile-defining members comprise auxiliary impressions permitting the positioning of metal parts designed to be made fast to the profiled element during moulding, the mould comprising if necessary one or several supplementary interchangeable members, slidable parallel to the joint plane and fixed to lateral jacks;
the removable fastening means associated with the outer surface of each shoe comprise T-grooves formed by extrusion in said outer surface and designed to receive the head of fastening members made fast to the tightening means.
According to a particular embodiment of the invention, a mould designed for the simultaneous production of several profiled elements of the same profile, each having a given length and straight or mitred ends, has a great length and includes terminal parts and separating parts with a cross-section corresponding to that of the impression and with respectively straight or mitred ends.
Also according to the invention, in a composite mould comprising several moulds of the aforesaid type, the upper half-moulds and the lower half-moulds are juxtaposed contiguously in pairs to form respectively an upper composite half-mould and a lower composite half-mould, the removable fastening means associated with the outer surface of each shoe being fixed to an upper or lower mounting frame, made fast to one of the plates of the tightening means and comprising essentially bars arranged transversely with respect to the shoes, the upper and lower half-moulds all having straight or mitred ends.
According to a first possible embodiment, the composite mould comprises two or several moulds of which the constituent half-moulds are respectively juxtaposed contiguously in pairs through their straight or mitred ends by means of a holding device and
REFERENCES:
patent: 2916771 (1959-12-01), Lang et al.
patent: 3087207 (1963-04-01), Styra
patent: 3173175 (1965-03-01), Femelson
patent: 3836110 (1974-09-01), Osinsky et al.
patent: 4145176 (1979-03-01), Nelson
patent: 4269586 (1981-05-01), Royayne
Etablissements EVIRA
Flint, Jr. J. Howard
Flocks Karl W.
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