US 12,325,064 B2
Head and lubricated piston
Carlo Schivalocchi, Brescia (IT)
Assigned to COPROMEC DIE CASTING S.R.L. A SOCIO UNICO, Roè Volciano (IT)
Appl. No. 18/285,426
Filed by COPROMEC DIE CASTING S.R.L. A SOCIO UNICO, Roè Volciano (IT)
PCT Filed Jan. 14, 2021, PCT No. PCT/IB2021/050242
§ 371(c)(1), (2) Date Oct. 3, 2023,
PCT Pub. No. WO2021/144722, PCT Pub. Date Jul. 22, 2021.
Claims priority of application No. 102020000000553 (IT), filed on Jan. 14, 2020.
Prior Publication US 2024/0181524 A1, Jun. 6, 2024
Int. Cl. B22D 17/20 (2006.01)
CPC B22D 17/203 (2013.01) [B22D 17/2038 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A head assembly comprising:
a piston head for making a piston of a press for a die-casting machine, comprising:
a head body having a side wall extending around a head axis, and
at least one ring seat obtained in the side wall and suitable to receive a respective sealing ring, the at least one ring seat forming a cylindrical bottom wall parallel to the head axis and being delimited by at least one annular shoulder obtained in the head body; and
a sealing ring housed in the at least one ring seat, wherein at least one gap is formed between said sealing ring and the at least one annular shoulder;
wherein:
a lubrication circuit is obtained in the head body and is suitable to facilitate the sliding of the piston in a respective container of the die-casting machine,
the lubrication circuit comprises at least one lubrication end duct leading into the at least one ring seat so as to be covered by the sealing ring, and
at least one lubrication end duct leads into a surface channel which runs through the bottom wall, said surface channel ending at a base of said at least one annular shoulder in order to convey a lubricant towards the at least one gap for the outflow of the lubricant from the at least one gap.