A seal for barrel shaped cylinder

A helical coiled seal for sealing a piston-cylinder assembly, comprising:

• a piston-sealing C-shaped ring having a first gap;
• a connecting C-shaped ring comprising:
• an inward wing protruded inwardly from a section on an inner perimeter of the connecting C-shaped ring near a first end of the connecting C-shaped ring;
• and
• an outward wing protruded outwardly from a section on an outer perimeter of the connecting C-shaped ring near a second end of the connecting C-shaped ring;
• and
• a cylinder-sealing C-shaped ring having a second gap;
• wherein the piston-sealing C-shaped ring is connected end-to-end to the first end of the connecting C-shaped ring and cylinder-sealing C-shaped ring is connected end-to-end to the second end of the connecting C-shaped ring forming a helical coil;
• wherein the inward wing width allows the inward wing inner perimeter to align with the piston-sealing C-shaped ring inner perimeter;
• wherein the outward wing width allows the outward wing outer perimeter to align with the cylinder-sealing C-shaped ring outer perimeter.
• wherein the inward wing length is equal or longer than the first gap such that the piston-sealing C-shaped ring with the inward wing form an at least 360 degree piston surface sealing contact;
• and
• wherein the outward wing length is equal or longer than the second gap such that the piston-sealing C-shaped ring with the outward wing form an at least 360 degree cylinder interior wall sealing contact.