Station and method for curing a tread strip

Patent metadata

Field	Value
Publication number	US-10994448-B2
Application number	US-201816484557-A
Country	US
Kind code	B2
Filing date	Mar 2, 2018
Priority date	Mar 7, 2017
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

Station ( 7 ) and method of curing for a tread strip ( 2 ); provided are: a flat curing mold ( 9 ) which is composed of a lower shell ( 10 ) and an upper cover ( 11 ); and an extractor element ( 17 ) which is suitable for extracting the cured tread strip ( 2 ) from the lower shell ( 10 ) after the curing operation; the cured tread strip ( 2 ) has a first wall ( 13 ), which has a relief design and is in contact with the lower shell ( 10 ), and a second wall ( 14 ) which is opposite the first wall ( 13 ), and is in contact with the upper cover ( 11 ); the extractor element ( 17 ) is suitable for adhering to the second wall ( 14 ) of the tread strip ( 2 ) along the entire length of the second wall ( 14 ) itself; and the extractor element ( 17 ) is movable perpendicularly with respect to the second wall ( 14 ) of the tread strip ( 2 ) in order to simultaneously raise the whole tread strip ( 2 ) from the lower shell ( 10 ).

First claim

The invention claimed is:

1. Station ( 7 ) for the curing of a tread strip ( 2 ); the curing station ( 7 ) comprises:
a flat curing mold ( 9 ) that has a parallelepiped shape and that is composed of a lower shell ( 10 ) and an upper cover ( 11 ) that are brought together in order to close the curing mold ( 9 ) and that are separated in order to open the curing mold ( 9 ); and
an extractor element ( 17 ), which is suitable for extracting a cured tread strip ( 2 ) from the lower shell ( 10 ) once a curing operation has been completed;
wherein the cured tread strip ( 2 ) has a first wall ( 13 ), which has a relief design and is in contact with the lower shell ( 10 ), and a second wall ( 14 ), which is smooth, is opposite the first wall ( 13 ) and is in contact with the upper cover ( 11 );
wherein the extractor element ( 17 ) is suitable for adhering to the second wall ( 14 ) of the tread strip ( 2 ) along the entire length of the second wall ( 14 ) itself; and
the extractor element ( 17 ) moves perpendicularly with respect to the second wall ( 14 ) of the tread strip ( 2 ) in order to simultaneously raise the entire tread strip ( 2 ) from the lower shell ( 10 ),
wherein the extractor element ( 17 ) comprises a holding wall ( 18 ) that rests against the second wall ( 14 ) of the tread strip ( 2 ) and a grabbing member ( 19 ) that is arranged at the holding wall ( 18 ) and is suitable for generating suction that ensures the adhesion by suction of the tread strip ( 2 ) to the holding wall ( 18 ),
wherein the grabbing member ( 19 ) comprises a plurality of suctions holes ( 20 ) that open through the holding wall ( 18 ) and can be connected to a suction source ( 21 );
the curing station ( 7 ) is characterized in that:
the extractor element ( 17 ) is integrated in the cover ( 11 ) and, therefore, the holding wall ( 18 ) is part of the cover ( 11 );
and
the grabbing member ( 19 ) comprises a corresponding piston ( 24 ) for each suction hole ( 20 ) that is movable in the interior of the suction hole ( 20 ) itself to locally generate a depression.

2. Curing station ( 7 ) according to claim 1 , wherein the grabbing member ( 19 ) comprises an actuation device ( 25 ) that, during a curing process, maintains each piston ( 24 ) in a first position, wherein an external wall of the piston ( 24 ) is coplanar with the holding wall ( 18 ), and, at an end of the curing process, the actuation device ( 25 ) withdraws each piston ( 24 ) to a second position, wherein the external wall of the piston ( 24 ) is distanced from the holding wall ( 18 ).

3. Curing station ( 7 ) according to claim 1 , wherein:
the lower shell ( 10 ) of the curing mold ( 9 ) comprises an irregular lower surface ( 15 ), which has a plurality of cavities ( 26 ) that reproduce in negative the shape of a tread, and determines the shape of the first wall ( 13 ) of the tread strip ( 2 ); and
the upper cover ( 11 ) of the curing mold ( 9 ) comprises a flat upper surface ( 16 ) that determines the shape of the second wall ( 14 ) of the tread strip ( 2 ).

4. Curing station ( 7 ) according to claim 1 , wherein the cover ( 11 ) comprises the holding wall ( 18 ) that rests against the second wall ( 14 ) of the tread strip ( 2 ) and has at least one cavity ( 26 ) that has at least one undercut and that is filled with rubber during a curing process in order to a create a protuberance ( 27 ) of the tread strip ( 2 ) that mechanically connects the tread strip ( 2 ) to the cover ( 11 ).

5. Station ( 7 ) for the curing of a tread strip ( 2 ); the curing station ( 7 ) comprises:
a flat curing mold ( 9 ) that has a parallelepiped shape and that is composed of a lower shell ( 10 ) and an upper cover ( 11 ) that are brought together in order to close the curing mold ( 9 ) and that are separated in order to open the curing mold ( 9 ); and
an extractor element ( 17 ), which is suitable for extracting the cured tread strip ( 2 ) from the lower shell ( 10 ) once the curing operation has been completed;
wherein the cured tread strip ( 2 ) has a first wall ( 13 ), which has a relief design and is in contact with the lower shell ( 10 ), and a second wall ( 14 ), which is smooth, is opposite the first wall ( 13 ) and is in contact with the upper cover ( 11 );
wherein the extractor element ( 17 ) is suitable for adhering to the second wall ( 14 ) of the tread strip ( 2 ) along the entire length of the second wall ( 14 ) itself; and
the extractor element ( 17 ) moves perpendicularly with respect to the second wall ( 14 ) of the tread strip ( 2 ) in order to simultaneously raise the entire tread strip ( 2 ) from the lower shell ( 10 ),
wherein the extractor element ( 17 ) comprises a holding wall ( 18 ) that rests against the second wall ( 14 ) of the tread strip ( 2 ) and a grabbing member ( 19 ) that is arranged at the holding wall ( 18 ) and is suitable for generating suction that ensures the adhesion by suction of the tread strip ( 2 ) to the holding wall ( 18 ),
wherein the grabbing member ( 19 ) comprises a plurality of suctions holes ( 20 ) that open through the holding wall ( 18 ) and can be connected to a suction source ( 21 );
the curing station ( 7 ) is characterized in that:
the extractor element ( 17 ) is integrated in the cover ( 11 ) and, therefore, the holding wall ( 18 ) is part of the cover ( 11 ); and
the grabbing member ( 19 ) comprises at least one porous baffle ( 23 ) that is permeable to air and impermeable to rubber and is disposed at the suction holes ( 20 ) in order to close the suction holes ( 20 ) themselves.

6. Curing station ( 7 ) according to claim 5 wherein a single baffle is provided ( 23 ) that completely covers the holding wall ( 18 ).

7. Curing station ( 7 ) according to claim 5 , wherein a plurality of porous baffles ( 23 ) is provided, each of which is arranged within a corresponding suction hole ( 20 ).

8. Curing station ( 7 ) according to claim 5 , wherein the suction source ( 21 ) is external to the extractor element ( 17 ).

9. Station ( 7 ) for the curing of a tread strip ( 2 ); the curing station ( 7 ) comprises:
a flat curing mold ( 9 ) that has a parallelepiped shape and that is composed of a lower shell ( 10 ) and an upper cover ( 11 ) that are brought together in order to close the curing mold ( 9 ) and that are separated in order to open the curing mold ( 9 ); and
an extractor element ( 17 ), which is suitable for extracting the cured tread strip ( 2 ) from the lower shell ( 10 ) once the curing operation has been completed;
wherein the cured tread strip ( 2 ) has a first wall ( 13 ), which has a relief design and is in contact with the lower shell ( 10 ), and a second wall ( 14 ), which is smooth, is opposite the first wall ( 13 ) and is in contact with the upper cover ( 11 );
wherein the extractor element ( 17 ) is suitable for adhering to the second wall ( 14 ) of the tread strip ( 2 ) along the entire length of the second wall ( 14 ) itself; and
the extractor element ( 17 ) moves perpendicularly with respect to the second wall ( 14 ) of the tread strip ( 2 ) in order to simultaneously raise the entire tread strip ( 2 ) from the lower shell ( 10 ),
wherein the extractor element ( 17 ) comprises a holding wall ( 18 ) that rests against the second wall ( 14 ) of the tread strip ( 2 ) and a grabbing member ( 19 ) that is arranged at the holding wall ( 18 ) and is suitable for generating suction that ensures the adhesion by suction of the tread strip ( 2 ) to the holding wall ( 18 ),
wherein the grabbing member ( 19 ) comprises a plurality of suctions holes ( 20 ) that open through the holding wall ( 18 ) and can be connected to a suction source ( 21 );
the curing station ( 7 ) is characterized in that:
the extractor element ( 17 ) is separate

Assignees

• Bridgestone Corp

Inventors

• Iozia Francesco
• Neroni Simone
• Castaldo Antonio

Classifications

• B29C37/0003

  Discharging moulded articles from the mould (constructions for removing the articles B29C33/44) · CPC title

• B29C37/0007

  using means operable from outside the mould for moving between mould parts, e.g. robots · CPC title

• B29C35/02

  Heating or curing, e.g. crosslinking or vulcanizing {during moulding, e.g. in a mould}(cold vulcanisation B29C35/18 {; vulcanising tyres, presses therefor B29D30/0601}) · CPC title

• B29C33/46 Primary

  using fluid pressure · CPC title

• B29C2043/5046

  using vacuum · CPC title