Ring manufacture, productive of line contact seal

Claim 2

A piston having a groove adapted to receive therein a parted ring in which, in the collapsed state of the ring, the parting becomes closed or substantially so, as in operation of the piston; said groove presenting sides for confronting and being sealed by the received ring, and imparting a generally V-shape to the receiving groove; and a parted keystone seal ring in the groove having a ring side, and a face and a back adjacent the ring side and respectively joined to same at the side of the ring and forming corners therewith at that side; said ring side arranged so as to be frusto conical when the ring is in collapsed state, and with the inner periphery thereof, which is at the corner of the junction with the back, establishing, in that state, a substantially continuous ring of contact with, when contacted by, the confronting groove side to be sealed; the inner periphery of said ring side characterized by having all points thereof planar to one another to at least the equivalent of about ten to five light bands of flatness at standard inspection wavelength.

Claim 3

A piston having a groove adapted to receive therein a split seal ring which, when in collapsed state, becomes closed or substantially so, as in installation of the piston; the axial and radial dimensions of said groove adapted to permit a received ring with live ring characteristics and positive torsion characteristics to be spring loaded mechanically and pressure loaded by gas and to be operatively free for twisting motion to prevent carbon build-up in the receiving groove, said groove presenting sides for confronting, and being sealed by, the received ring; and a split seal ring in the groove having a side, and a face and a back adjacent the side and respectively joined to same at the side of the ring and forming corners therewith at that side; said ring side being frusto conical when the ring is in a collapsed twisted state, said ring side as viewed in that state in cross section adjacent the back having a narrow seal band thereon, which band is contiguous to the corner of the junction with the back, which band forms an angle of intersection with the major portion of the right side and constitutes the inner periphery of said side, and which band establishes a substantially continuous ring of pressure contact with, when contacted by, a confronting groove side to be sealed; said ring comprising a ring spring having live ring characteristics and positive torsion characteristics, whereby the ring has in addition to the collapsed twisted state aforesaid in which said ring side is frusto conical, a free spring state in which said side is generally flat, and another collapsed state in which the spring is gas-flattened so that said side is generally flat; said ring having a slight face angle; the narrow seal band constituting the inner periphery of the ring side having all points thereof planar to at least the equivalent of about 10 to 5 light bands of flatness, at standard inspection wavelength.

Claim 4

A piston having a groove adapted to receive therein a split seal ring which, when in collapsed state, becomes closed or substantially so, as in installation of the piston; the axial and radial dimensions of said groove adapted to permit a received ring with live ring characteristics and positive torsion characteristics to be spring loaded mechanically and pressure loaded by gas and to be operatively free for twisting motion to prevent carbon build-up in the receiving groove, said groove presenting sides for confronting, and being sealed by, the received ring; and a split seal ring in the groove having a side, and a face and a back adjacent the side and respectively joined to same at the side of the ring and forming corners therewith at that side; said ring side being frusto conical when the ring is in a collapsed twisted state, said ring side as viewed in that state in cross section adjacent the back having a narrow seal band thereon, which band is contiguous to the corner of the junction with the back, which band forms an angle of intersection with the major portion of the right side and constitutes the inner periphery of said side, and which band establishes a substantially continuous ring of pressure contact with, when contacted by, a confronting groove side to be sealed; said ring comprising a ring spring having live ring characteristics and positive torsion characteristics, whereby the ring has in addition to the collapsed twisted state aforesaid in which said ring side is frusto conical, a free spring state in which said side is generally flat, and another collapsed state in which the spring is gas-flattened so that said side is generally flat; said ring having a slight face angle; the narrow seal band constituting the inner periphery of the ring side having all points thereof planar to at least the equivalent of about 10 to 5 light bands of flatness, at standard inspection wavelength.

Claim 5

A piston having a groove adapted to receive therein a split seal ring which, when in collapsed state, becomes closed or substantially so, as in installation of the piston; said groove presenting sides for confronting, and being sealed by, the received ring; and a split seal ring in the groove having a side, and a face and a back adjacent the ring side and respectively joined to same at the side of the ring and forming corners therewith at that side; said ring side arranged so as to be frusto conical at least when the ring is in collapsed state, and with the inner periphery thereof, which is at the corner of the juncture with the back, establishing, in that state, a sUbstantially continuous pressure ring of contact with, when contacted by, the confronting groove side to be sealed; the inner periphery of said ring side characterized by having all points thereof planar to one another to at least the equivalent of about 10 to 5 light bands of flatness at standard inspection wavelength.

Claim 6

A piston having a groove adapted to receive therein a split seal ring which, when in collapsed state, becomes closed or substantially so, as in installation of the piston; said groove presenting sides for confronting, and being sealed by, the received ring; and a split seal ring in the groove having a side, and a face and a back adjacent the ring side and respectively joined to same at the side of the ring and forming corners therewith at that side; said ring side arranged so as to be frusto conical at least when the ring is in collapsed state, and with the inner periphery thereof, which is at the corner of the juncture with the back, establishing, in that state, a sUbstantially continuous pressure ring of contact with, when contacted by, the confronting groove side to be sealed; the inner periphery of said ring side characterized by having all points thereof planar to one another to at least the equivalent of about 10 to 5 light bands of flatness at standard inspection wavelength.