Link mechanism of surgical robot
AssigneeNuovo Pignone Holding S.p.A.
InventorsFranco Graziani, Massimo Iacobelli, Simone Pratesi
Life of this patent
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Abstract
A scraper device for a reciprocating compressor piston rod that comprises at least one scraper ring, provided with at least one lip which faces the surface of the said rod, and a box to contain the scraper ring and for centering on the rod, wherein this scraper ring is produced by means of mechanical processing of deformable plastics materials and wherein this container box is accommodated in support elements with radial play.
Claims17
A scraper device for a reciprocating compressor piston rod comprising:
- at least one scraper ring, provided with an annular front surface facing a proximate end of the piston rod, wherein said front surface further comprises at least one lip abutting a surface of the rod, wherein said scraper ring is of formed of a deformable plastic material;
- a container box containing the scraper ring and centering the ring on the rod, said container box further comprises an inner annular recess coaxial with and receiving said scraper ring and wherein the container box is held in at least one support elements which provides a radial gap between an inner wall of the support element and an outer wall of the container box, and
- an oil accumulation tank defined by the inner annular recess of the container box, the annular front surface of the scraper ring and the surface of the rod.
A scraper for a piston rod in a reciprocating compressor having a stationary support container, wherein the rod moves reciprocally with respect to said support container and said container includes an annular inner groove having an outer annular surface, said scraper comprising:
- an annular scraper ring having an annular front surface slidably engaging said rod, wherein said scraper ring is coaxial with said piston rod;
- a container box having a first annular inner recess receiving said scraper ring and an outer peripheral surface opposite to said outer annular surface of the support container, wherein said container box is coaxial to said piston rod and seated within the annular inner groove of the support container, and a radial gap exists between the outer peripheral surface of the box and the outer annular surface of said groove, and
- an oil accumulation tank defined by a second annular inner recess of the container box, the annular front surface of the scraper ring and the surface of the rod.
Dependencies are inferred from the claim text.