Piston-rings , seats therefor; Ring sealings of similar construction (other sealings between pistons and cylinders F16J3/06, F16J15/16 ; tools for mounting or removing piston-rings or the like B25B; piston sealing arrangements on brake master cylinders B60T11/236 )

Child Classifications

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• F16J 9/02 L-section rings
• F16J 9/04 Helical rings
• F16J 9/06 using separate springs expanding the rings; Springs therefor
• F16J 9/08 with expansion obtained by pressure of the medium
• F16J 9/10 Special members for adjusting the rings
• F16J 9/12 Details
• F16J 9/26 characterised by the use of particular materials
• F16J 9/28 of non-metals