Piston for a beverage infusion automatic machine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A47J-031/34
A47J-031/24
출원번호
UP-0023423
(2004-12-29)
등록번호
US-7621212
(2009-12-02)
우선권정보
EP-04425007(2004-01-09)
발명자
/ 주소
Carbonini, Carlo
출원인 / 주소
Rancilio Macchine per Caffe' S.p.A.
대리인 / 주소
Bacon & Thomas, PLLC
인용정보
피인용 횟수 :
4인용 특허 :
3
초록▼
A piston (11) of an automatic machine for infusion of beverages, such as coffee and the like, the piston having a piston head (13a, 13b) divided into two parts connected together and axially movable relative to each other, an annular gasket (15) being housed between those parts and radially expandin
A piston (11) of an automatic machine for infusion of beverages, such as coffee and the like, the piston having a piston head (13a, 13b) divided into two parts connected together and axially movable relative to each other, an annular gasket (15) being housed between those parts and radially expanding when an axially directed thrust such as to make said two piston parts (13a, 13b) approach each other is applied onto said piston (11), wherein the elastic resistance of said gasket (15) keeps said two piston parts (13a, 13b) spaced apart when no axial thrust is applied onto the piston.
대표청구항▼
I claim: 1. A piston of an automatic machine for infusion of beverages, the piston being associated with a duct allowing the passage of liquid intended for infusion of said beverage and comprising: a piston head divided into two parts connected together and axially movable relative to each other so
I claim: 1. A piston of an automatic machine for infusion of beverages, the piston being associated with a duct allowing the passage of liquid intended for infusion of said beverage and comprising: a piston head divided into two parts connected together and axially movable relative to each other so that said two piston parts are adapted to approach each other when an axially directed thrust is applied to said piston, and wherein said duct is an axial duct of said piston; an annular gasket housed between said two piston parts and radially expanding when an axially directed thrust is applied to said piston so as to make said two piston parts approach each other, the elastic resistance of said gasket keeping said two piston parts spaced apart when no axial thrust is applied onto the piston wherein said gasket ensures liquid tightness between said two piston parts both when said piston it is not submitted to an axial thrust, and when the piston is submitted to an axial thrust; and a circumferential seat for receiving said annular gasket formed between said two piston parts, wherein said seat includes; an internal zone having a C-shaped profile, intended to retain and axially compress said gasket, an external zone having a rectangular trapezoid profile joined along a minor side thereof with the C-shaped profile, and communicating with said internal zone and intended to allow the outward radial expansion of the gasket, and two opposed circumferential projections provided between said internal zone and said external zone, and axially extending to keep said gasket in said seat. 2. A piston as claimed in claim 1, wherein, when no axial thrust is applied to said piston, said gasket lies within a diameter of said two piston parts and, when an axial thrust is applied to said piston to cause said two piston parts to approach each other, said gasket projects outside said diameter. 3. A piston as claimed in claim 1, wherein said gasket has an internal portion housed in said internal zone of said seat, and an external portion that is housed in said external zone of said seat and that can freely radially expand outside said seat when said gasket is axially compressed. 4. A piston as claimed in claim 3, wherein said external portion of said gasket has a convex surface. 5. A piston of an automatic machine for infusion of beverages, the piston being associated with a duct allowing the passage of liquid intended for infusion of said beverage and comprising: a piston head divided into two parts connected together and axially movable relative to each other so that said two piston parts are adapted to approach each other when an axially directed thrust is applied to said piston, and wherein said duct is an axial duct of said piston; an annular gasket housed between said two piston parts and radially expanding when an axially directed thrust is applied to said piston so as to make said two piston parts approach each other, the elastic resistance of said gasket keeping said two piston parts spaced apart when no axial thrust is applied onto the piston wherein said gasket ensures liquid tightness between said two piston parts both when said piston it is not submitted to an axial thrust, and when the piston is submitted to an axial thrust; and a circumferential seat for receiving said annular gasket formed between said two piston parts, wherein said seat includes; an internal zone intended to retain and axially compress said gasket, an external zone communicating with said internal zone and intended to allow the outward radial expansion of the gasket; wherein said seat has a T-shaped section, and wherein the crossbar of the "T" corresponds with said internal zone and the stem of the "T" corresponds with the external zone. 6. A piston as claimed in claim 5, wherein said gasket has a T-shaped section, and wherein the internal portion, corresponding with the crossbar of the "T", is housed in said internal zone of said seat, and the external portion, corresponding with the stem of the "T", is housed in said external zone of said seat and can freely radially expand towards the outside of said seat when said gasket is axially compressed. 7. A piston as claimed in claim 1 or 5, wherein said two piston parts comprise a first, outer piston part intended to compress the powder for the infusion of said beverage, and a second, inner piston part, said second piston part comprising an axial cavity receiving a portion of said first piston part, said piston portion being slidable in said axial cavity when said two piston parts are made to slide relative to each other. 8. A piston as claimed in claim 1 or 5, wherein said two piston parts are always kept axially spaced apart during the operating cycle of the piston. 9. A piston as claimed in claim 1 or 5, wherein said piston is equipped with an axial duct allowing the passage of a beverage obtained as a result of the infusion. 10. A piston as claimed in claim 1 or 5, wherein said beverages to be infused is coffee. 11. An infusion assembly for an automatic machine for infusion of beverages, including coffee, comprising an infusion chamber and at least one piston co-operating with said chamber to compress inside it the powder from which said beverage is to be extracted by infusion of a liquid, said chamber and said piston being movable relative to each other, wherein said piston comprises a piston of an automatic machine for infusion of beverages, the piston being associated with a duct allowing the passage of liquid intended for infusion of said beverage and comprising: a piston head divided into two parts connected together and axially movable relative to each other so that said two piston parts are adapted to approach each other when an axially directed thrust is applied to said piston; an annular gasket housed between said two piston parts and radially expanding when an axially directed thrust is applied to said piston so as to make said two piston parts approach each other, the elastic resistance of said gasket keeping said two piston parts spaced apart when no axial thrust is applied onto the piston wherein said gasket ensures liquid tightness between said two piston parts both when said piston it is not submitted to an axial thrust, and when the piston is submitted to an axial thrust; and a circumferential seat for receiving said annular gasket formed between said two piston parts, wherein said seat includes; an internal zone having a C-shaped profile, intended to retain and axially compress said gasket, an external zone having a rectangular trapezoid profile joined along a minor side thereof with the C-shaped profile, and communicating with said internal zone and intended to allow the outward radial expansion of the gasket, and two opposed circumferential projections provided between said internal zone and said external zone, and axially extending to keep said gasket in said seat. 12. An infusion assembly as claimed in claim 11, wherein said annular gasket exerts a radial tightness against the internal wall of said chamber when an axial force is applied onto said piston to compress said powder, said axial force being sufficient to bring said two piston parts closer to each other. 13. An automatic machine for beverage infusion, comprising an infusion assembly provided with an infusion chamber and at least one piston co-operating with said chamber to compress inside it the powder from which said beverage is to be extracted by infusion of a liquid, said chamber and said piston being movable relative to each other, wherein said piston comprises a piston of an automatic machine for infusion of beverages, the piston being associated with a duct allowing the passage of liquid intended for infusion of said beverage and comprising: a piston head divided into two parts connected together and axially movable relative to each other so that said two piston parts are adapted to approach each other when an axially directed thrust is applied to said piston; an annular gasket housed between said two piston parts and radially expanding when an axially directed thrust is applied to said piston so as to make said two piston parts approach each other, the elastic resistance of said gasket keeping said two piston parts spaced apart when no axial thrust is applied onto the piston wherein said gasket ensures liquid tightness between said two piston parts both when said piston it is not submitted to an axial thrust, and when the piston is submitted to an axial thrust; and a circumferential seat for receiving said annular gasket formed between said two piston parts, wherein said seat includes; an internal zone having a C-shaped profile, intended to retain and axially compress said gasket, an external zone having a rectangular trapezoid profile joined along a minor side thereof with the C-shaped profile, and communicating with said internal zone and intended to allow the outward radial expansion of the gasket, and two opposed circumferential projections provided between said internal zone and said external zone, and axially extending to keep said gasket in said seat. 14. A machine for beverage infusion as claimed in claim 13, wherein a beverage to be infused is coffee. 15. A method of obtaining radial tightness between a piston of a machine for beverage infusion and a corresponding infusion chamber wherein the piston is associated with a duct allowing the passage of liquid intended for infusion of said beverage, the method comprising the steps of: providing in said piston a piston head divided into two parts connected together and axially movable relative to each other so that said two piston parts approach each other when an axially directed thrust is applied to said piston, and wherein said duct is an axial duct of said piston; arranging between said two piston parts an annular gasket capable of radially expanding when an axially directed thrust making said two piston parts approach each other, is applied to said piston; and of keeping said two piston parts axially spaced apart as a result of elastic resistance of said annular gasket, when no axial thrust is applied onto the piston; and configuring between said two piston parts a circumferential seat for receiving said annular gasket, said seat including; an internal zone intended to retain and axially compress said gasket, and an external zone intended to allow the outward radial expansion of the gasket; wherein said step of configuring the seat comprises the step of configuring the internal zone with a C-shaped profile intended to retain and axially compress said gasket, and the external zone with a rectangular trapezoid profile joined along its minor side with the C-shaped section of said internal zone and intended to allow the outward radial expansion of the gasket. 16. A method of obtaining radial tightness between a piston of a machine for beverage infusion and a corresponding infusion chamber wherein the piston is associated with a duct allowing the passage of liquid intended for infusion of said beverage, the method comprising the steps of: providing in said piston a piston head divided into two parts connected together and axially movable relative to each other so that said two piston parts approach each other when an axially directed thrust is applied to said piston, and wherein said duct is an axial duct of said piston; arranging between said two piston parts an annular gasket capable of radially expanding when an axially directed thrust making said two piston parts approach each other, is applied to said piston; and of keeping said two piston parts axially spaced apart as a result of elastic resistance of said annular gasket, when no axial thrust is applied onto the piston; and configuring between said two piston parts a circumferential seat for receiving said annular gasket, said seat including; an internal zone intended to retain and axially compress said gasket, and an external zone intended to allow the outward radial expansion of the gasket; wherein said step of configuring the seat comprises the step of configuring a seat having a T-shaped section, the crossbar of the "T" corresponding with said internal zone and the stem of the "T" corresponding with the external zone. 17. An infusion assembly for an automatic machine for infusion of beverages, including coffee, comprising an infusion chamber and at least one piston co-operating with said chamber to compress inside it the powder from which said beverage is to be extracted by infusion of a liquid, said chamber and said piston being movable relative to each other, wherein said piston comprises a piston of an automatic machine for infusion of beverages, the piston being associated with a duct allowing the passage of liquid intended for infusion of said beverage and comprising: a piston head divided into two parts connected together and axially movable relative to each other so that said two piston parts are adapted to approach each other when an axially directed thrust is applied to said piston; an annular gasket housed between said two piston parts and radially expanding when an axially directed thrust is applied to said piston so as to make said two piston parts approach each other, the elastic resistance of said gasket keeping said two piston parts spaced apart when no axial thrust is applied onto the piston wherein said gasket ensures liquid tightness between said two piston parts both when said piston it is not submitted to an axial thrust, and when the piston is submitted to an axial thrust; and a circumferential seat for receiving said annular gasket formed between said two piston parts, wherein said seat includes; an internal zone intended to retain and axially compress said gasket, an external zone communicating with said internal zone and intended to allow the outward radial expansion of the gasket; wherein said seat has a T-shaped section, and wherein the crossbar of the "T" corresponds with said internal zone and the stem of the "T" corresponds with the external zone. 18. An infusion assembly as claimed in claim 17, wherein said annular gasket exerts a radial tightness against the internal wall of said chamber when an axial force is applied onto said piston to compress said powder, said axial force being sufficient to bring said two piston parts closer to each other. 19. An automatic machine for beverage infusion, comprising an infusion assembly provided with an infusion chamber and at least one piston co-operating with said chamber to compress inside it the powder from which said beverage is to be extracted by infusion of a liquid, said chamber and said piston being movable relative to each other, wherein said piston comprises a piston of an automatic machine for infusion of beverages, the piston being associated with a duct allowing the passage of liquid intended for infusion of said beverage and comprising: a piston head divided into two parts connected together and axially movable relative to each other so that said two piston parts are adapted to approach each other when an axially directed thrust is applied to said piston; an annular gasket housed between said two piston parts and radially expanding when an axially directed thrust is applied to said piston so as to make said two piston parts approach each other, the elastic resistance of said gasket keeping said two piston parts spaced apart when no axial thrust is applied onto the piston wherein said gasket ensures liquid tightness between said two piston parts both when said piston it is not submitted to an axial thrust, and when the piston is submitted to an axial thrust; and a circumferential seat for receiving said annular gasket formed between said two piston parts, wherein said seat includes; an internal zone intended to retain and axially compress said gasket, an external zone communicating with said internal zone and intended to allow the outward radial expansion of the gasket; wherein said seat has a T-shaped section, and wherein the crossbar of the "T" corresponds with said internal zone and the stem of the "T" corresponds with the external zone. 20. A machine for beverage infusion as claimed in claim 19, wherein a beverage to be infused is coffee.
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이 특허에 인용된 특허 (3)
Sowden, George; Bonissi, Vittorio; Fogagnolo, Armando, Coffee making machine.
Dammermann, Kurt Philip; Mack, Adam Mekeel; James, Matthew Thomas; Manoux, Philipe Roget, Beverage production machines and methods with tamping assembly.
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