Alternative piston pump for machines dispensing dyes, paints or similar products

Abstract

An alternative piston pump, able to take in and dispense a determinate quantity of a dye, paint or similar product, comprising a container having a cylindrical cavity inside which a piston is able to slide axially, and a sleeve extendible axially and rigid radially, inserted into said cylindrical cavity and having a first end connected to said piston. The sleeve extendible axially and rigid radially has a second end connected through a flange to a closing plate, able to close one end of the cylindrical cavity, and the piston and the sleeve extendible axially and rigid radially are made in a single piece.

1 . An alternative piston pump, able to take in and dispense a determinate quantity of a dye, paint or similar product, comprising a container having a cylindrical cavity inside which a piston is able to slide axially, and a sleeve extendible axially and rigid radially, inserted into said cylindrical cavity and having a first end connected to said piston, wherein said sleeve extendible axially and rigid radially has a second end connected through a flange to a closing plate, able to close one end of said cylindrical cavity, and in that wherein at least said piston and said sleeve extendible axially and rigid radially are made in a single piece. 
   
   
       2 . The alternative piston pump as in  claim 1 , wherein said closing plate is also made in a single piece with said sleeve extendible axially and rigid radially and said piston. 
   
   
       3 . The alternative piston pump as in  claim 1 , wherein said container, said sleeve extendible axially and rigid radially, said piston and said closing plate are made of plastics of the technical type. 
   
   
       4 . The alternative piston pump as in  claim 3  wherein said plastics of the technical type are techno-polymers. 
   
   
       5 . The alternative piston pump as in  claim 1 , wherein said sleeve extendible axially and rigid radially is coaxial with said cylindrical cavity and forms, with the wall of said cylindrical cavity, an annular chamber. 
   
   
       6 . The alternative piston pump as in  claim 1 , wherein external linear actuation means is able to compress and expand said sleeve extendible axially and rigid radially. 
   
   
       7 . The alternative piston pump as in  claim 1 , further comprising a tube disposed inside said sleeve extendible axially and rigid radially and fixed to said piston. 
   
   
       8 . The alternative piston pump as in  claim 6 , wherein a tube is connected to said linear actuation means by means of connection means. 
   
   
       9 . The alternative piston pump as in  claim 8 , wherein said communication means comprises a shaft. 
   
   
       10 . The alternative piston pump as in  claim 9 , wherein said shaft is fixed in an axial cavity of said tube. 
   
   
       11 . The alternative piston pump as in  claim 6 , wherein said external linear actuation means comprises a motor of the step-by-step type. 
   
   
       12 . The alternative piston pump as in  claim 7 , wherein said tube is made in a single piece with a plate provided with at least two guide hollows, slidingly cooperating with corresponding fixed guide rods. 
   
   
       13 . The alternative piston pump as in  claim 1 , wherein said container also comprises first conveyor means able to convey said quantity of dye inside said cylindrical cavity, when said sleeve extendible axially and rigid radially is compressed. 
   
   
       14 . The alternative piston pump as in  claim 13 , further comprising second conveyor means able to convey said quantity of dye outside said cylindrical cavity, when said sleeve extendible axially and rigid radially expands.