US 10,981,311 B2Granted

Method and associated tooling for the manufacture of a sleeve by injection moulding, and resulting sleeve

OwnerBernard Renzoinventor

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Abstract

An injection-molding method for manufacturing a sleeve (1) comprising a cylindroconical body comprising at least one deformable bellows portion (2) arranged in line with a base (3), by means of tooling comprising a mold (8) formed of at least two portions (81, 82) defining a mold cavity and a core that can be inserted into the mold cavity, and comprising a first cylindroconical portion (11) provided externally with a helical thread that is complementary to a helical thread of the mold (8) and a second portion (15) that is complementary to a recessed portion of the mold (8), said method comprises a step of filling the mold spaces left free between the core and the inside of the mold cavity (9), a step of opening the mold (8) during which, or at the end of which, the second portion (15) of the core is moved axially in a direction parallel to the winding axis (XX′) of the threads of the helical thread going away from the first portion (11) of the core, and a step of driving relative turning movement of the sleeve (1) and of the first part (11) of the core.

An injection-molding method for manufacturing a sleeve in the shape of a cylindrical or cylindroconical molded hollow body with at least one deformable bellows portion arranged in line with a base, the base forming one end of the sleeve, said method comprising the steps of:

Obtaining a mold formed of at least two portions defining a mold cavity therebetween, said at least two portions movable between an open position and a closed position by relative movement of said mold portions,
Obtaining a core, that is insertable at least in part into the mold cavity, said core having a cylindrical or cylindroconical first portion that has an external helical thread that is complementary to helical threads in the mold cavity, so that, when said mold cavity is in the closed position, a first mold space is formed between said external helical threads of said core and said helical threads in said mold cavity for molding said at least one deformable bellows portion of the sleeve, said core also having a second movable portion that is complementary to a recessed portion of the mold so that, when said mold cavity is in the closed state, a second mold space is formed between said second movable portion of the core and the recessed portion of the mold for molding the base of the sleeve,
filling the first and second mold spaces left free between the core and the inside of the mold cavity by injecting material therein, when the core is inserted at least in part in the mold cavity and when the mold cavity is in the closed state,
opening the mold, and either during or after the opening, the second movable portion of the core is moved axially, in a direction parallel to a winding axis of the threads of the helical thread of the first portion of the core going away from the first portion of the core, and
driving turning movement of the sleeve relative to the first portion of the core to remove the sleeve from the mold by unscrewing.

2 more elements

Facts

Application

16/313,091Filed 20 Jun 2017

Priority

FR 165618430 Jun 2016

Published

US 2019/0217515 A118 Jul 2019

Granted

20 Apr 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

B29C 45/435
Using fluid under pressure: introduced between a mould core and a hollow resilient undercut article, e.g. bellows
B29C 45/262
Having screw-threaded mould walls: provided with unscrewing drive means
B29C 45/44
Removing or ejecting moulded articles: for undercut articles
B29K 2101/12
Use of unspecified macromolecular compounds as moulding material: thermoplastic materials

Abstract

Claims2