Back to results
US 2019/0217515 A1Published application
Method and associated tooling for the manufacture of a sleeve by injection moulding, and resulting sleeve
OwnerBernard RENZOinventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerBernard RENZOinventor
Estimating the term…
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, also referred to as a helical bellows, comprising a cylindrical or cylindroconical molded hollow body comprising at least one deformable bellows portion arranged in line with a base forming one end of the sleeve, by means of tooling comprising a mold formed of at least two portions defining a mold cavity suitable for passing from an open position to a closed position, and vice versa, by relative movement of said mold portions, and also of a core, which core can be inserted at least in part into the mold cavity and comprises a cylindrical or cylindroconical “first” portion that is provided externally with a helical thread that is complementary to a helical thread of the mold so that, when said mold cavity is in the closed state, a first mold space is formed between said helical threads for molding the bellows portion of the sleeve, the method comprising, in addition to the cylindrical or cylindroconical first portion provided externally with a helical thread, the core also comprises a “movable”, second 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 portion of the core and the recessed portion of the mold for molding the base of the sleeve, and, when the core is inserted at least in part in the mold cavity and when the mold cavity is in the closed state, said method comprises a step of filling the first and second mold spaces left free between the core and the inside of the mold cavity by injecting material therein, a step of opening the mold during which, or at the end of which, the second portion of the core is moved axially in a direction parallel to the 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 a step of driving turning movement of the sleeve relative to the first portion of the core with a view to removing the sleeve from the mold by unscrewing.
Injection-molding tooling for manufacturing a sleeve, also referred to as a helical bellows, comprising a cylindrical or cylindroconical molded hollow body comprising at least one deformable bellows portion arranged in line with a base forming one end of the sleeve, said tooling comprising a mold formed of at least two portions defining a mold cavity suitable for passing from an open position to a closed position, and vice versa, by relative movement of said mold portions, and also of a core, which core can be inserted at least in part into the mold cavity, said sleeve being formed by filling, by means of a filling material, the space left free between the core and the inside of the mold cavity, wherein the core is in at least two separable portions and comprises a cylindrical or cylindroconical “first” portion that is provided externally with a helical thread that is complementary to a helical thread of the mold so that, when the core is inserted at least in part in the mold cavity and when the mold cavity is in the closed state, a first mold space is formed between said helical threads for molding the bellows portion with helical turns of the sleeve, and a second portion that is complementary to a recessed portion of the mold so that, when the core is inserted at least in part in the mold cavity of the mold, and when the mold cavity is in the closed state, a second mold space is formed between said second portion of the core and the recessed portion of the mold for molding the base of the sleeve, the second portion of the core being a “movable” portion that is movable axially in a direction parallel to the winding axis of the threads of the helical thread of the first portion of the core going away from or towards the first portion of the core, when the core is inserted in the mold cavity.
A sleeve, also referred to as a helical bellows, comprising a cylindrical or cylindroconical molded hollow body comprising at least one deformable bellows portion arranged in line with a base forming one end of the sleeve, wherein the sleeve is an injection-molded part presenting internally at least one join plane at the junction between the base and the bellows portion.
Dependencies are inferred from the claim text.