Method and mold for producing an umbrella-type insulator

Details Method and mold for producing an umbrella-type insulator Method and mold for producing an umbrella-type insulator

B - Operations, Transporting

29

C

B29C 33/00 (2006.01) B29C 33/46 (2006.01) H01B 19/00 (2006.01)

Patent

CA 2299382

The invention seeks to provide an improved method for producing umbrella-type insulators comprising a core which is configured as a full body or a hollow cavity and umbrellas connected thereto, whereby problem-free demolding of said umbrella-type elements is guaranteed despite the fact that a vacuum is formed. This is achieved by fact that the mold is used with at least one valve which is arranged laterally and which extends as far as the surface of the umbrella elements or sleeve. Immediately after the beginning or during axial movement of the mold away from the umbrella-type element with a sleeve, a gas medium is automatically introduced into the cavity which is formed between the core and umbrella-type element with a sleeve and the mold or the valve opens under the effect of traction or pressure and the gaseous medium is thus introduced into the hollow cavity.

L'invention vise à perfectionner un procédé pour la fabrication d'isolateurs type parapluie en plastique comportant une partie centrale se présentant sous la forme d'un corps plein ou creux et à laquelle sont reliés des éléments type parapluie, de manière à assurer un démoulage parfait de ces derniers malgré la formation d'un vide dans le moule lors du processus de démoulage. A cet effet, le moule (5) est utilisé avec au moins une soupape (8) disposée latéralement et atteignant la surface (4.2) de l'élément type parapluie ou de la manchette (4). Immédiatement après le début ou bien au cours du mouvement d'éloignement axial du moule (5) par rapport à l'élément type parapluie (3) avec sa manchette (4), un milieu gazeux est introduit automatiquement dans la cavité (9) se formant entre la partie centrale (2) et l'élément type parapluie (3) avec sa manchette (4) d'une part et le moule (5) d'autre part, ou bien la soupape (8) s'ouvre sous l'effet d'une traction ou d'une pression et le milieu gazeux est ainsi introduit dans la cavité (9).

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