Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1996-06-28
1998-12-22
Bryant, David P.
Metal working
Method of mechanical manufacture
Assembling or joining
29559, 264DIG64, B23Q 300, B23Q 700
Patent
active
058506810
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to positioning a container or a container preform of thermoplastic material and having a neck with a circularly cylindrical inside wall, in a predetermined angular position on a mandrel inserted inside said neck.
The invention is particularly, but not exclusively applicable to relatively accurate angular positioning of a preform of thermoplastic material relative to the walls of a mold for forming a container, e.g. by blow molding or by stretch blow molding; this may relate particularly to angularly positioning special zones (e.g. thicker zones) of the preform properly relative to the walls of the mold cavity, or it may relate to positioning the start of the screw thread on the neck of a preform. Such proper positioning need not necessarily be constituted by a single position over 360.degree., but commonly, it may be constituted by any one out of n possible positions over 360.degree.; in other words, the preform needs to be rotated through some maximum angle of not more than 360.degree.
about its own axis on being received by a supporting mandrel (which in the example under consideration of subsequent processing by blow molding or by stretch blow molding may be the outlet of a blow nozzle), while the mandrel is itself in a known position relative to the walls of the mold cavity, given the structure of the installation.
Document FR-A-1 520 693 does indeed disclose a stopper system for flasks or the like which makes use of a pair of co-operating elements by means of a projection and an inclined shoulder respectively provided on the inside face of a covering stopper and on the outside face of the neck of a flask. However, that document provides no information relating to the angular positioning of a container or a container preform on a mandrel inserted into the neck thereof. Furthermore, the technical solution proposed in that document for closing a flask consists in fitting a female part (covering stopper) arranged to cover a male part (neck): Thus, in order to resolve the problem on which the present invention is based, that document under consideration suggests no more than positioning the container or the preform by means of a member surrounding the neck, as in the above-mentioned document. Unfortunately such a solution is not suitable for resolving the problem on which the invention is based, which problem aims to position the container angularly, by means of its neck, relative to a support mandrel inserted inside said neck. As a result the technical solution proposed in the above-mentioned document cannot be adopted, as described, for the purpose of resolving the problem posed in the context of the invention.
The object of the invention is to propose means--both a method and a system--that are technologically as simple as possible while remaining effective and reliable, and which as far as possible require minimal modifications to presently known installations, preferably being capable minimum amount of modification thereto.!
To these ends, in a first aspect, the invention provides a method of positioning a container or a container preform of thermoplastic material and having a neck with a circularly cylindrical inside wall, in a predetermined angular position on a mandrel inserted inside said neck, projection is provided on a surface selected from the inside wall of the neck and the outside wall of the mandrel, to bear against at least one thrust shoulder provided on a surface selected respectively from the outside wall of the mandrel and the inside wall of the neck, said shoulder facing respectively towards the free end of the mandrel or of the neck and extending over said wall while being inclined relative to the axis of the mandrel or of said neck, respectively, causing the neck to rotate relative to the mandrel, rotation being generated by said radial projection sliding against said shoulder, until locking means prevent relative movement of the mandrel and of the container once the neck is disposed in a predetermined angular orientation relative to the mandrel.
Adva
Bryant David P.
Sidel
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