Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Reexamination Certificate
1999-11-22
2001-11-13
Knight, Anthony (Department: 3626)
Seal for a joint or juncture
Seal between relatively movable parts
Piston ring or piston ring expander or seat therefor
C277S651000, C277S924000, C277S910000, C156S304300, C249S057000, C264SDIG006, C264S146000, C264S152000
Reexamination Certificate
active
06315299
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
BACKGROUND OF THE INVENTION
The present invention relates to O-ring seals and more particularly to an apparatus and method of forming a tension resistant O-ring.
1. Field of Invention
O-ring seals are well known and are generally formed from elastomeric material of a predetermined diameter. These seals are used for preventing fluid leaking in many applications and in particular in valves in the oil industry. These seals are effective in maintaining the instrument fluid tight under pressures for example, to 2000 psi, however when the pressure against the seal exceeds these pressures and is in the range of, for example, 68,950 KPA (10,000 psi) and a relief valve opens due to such pressure this high pressure dislodges the O-ring seal from its groove. Another O-ring must be installed in its place which requires disassembly of the relief valve in order to return the apparatus to operating condition.
This invention obviates this problem by forming an O-ring seal which is tension resistant and remains in place.
2. Description of the Prior Art
Conventional O-ring seals presently available in the market place may usually be expanded diametrically, beyond their diameter of repose, through a certain limit without exceeding the yield point of the O-ring material.
I am not aware of any prior patent that provides an O-ring seal in which its manufactured diameter cannot be exceeded by either manually or mechanically applied force.
BRIEF SUMMARY OF THE INVENTION
A continuous length of procured elastomer is extruded in elliptical configuration having a central aperture. A selected length of this tube is longitudinally and divided on its minor axis to form first and second halves. The first half is placed in a circular groove of predetermined diameter in a rubber mold with ends abutted and the semicircular opening facing upwardly. A high tensile cord of nonelastic syntectic material is wound in a groove on a cylinder equal in diameter with the toric axis of an O-ring to be formed and heat sealed to form a single endless strand. This strand is placed in the upwardly open semicircular elastomer groove. The second elastomer half is cooperatively superposed on the first elastometer half with the butted ends of the second half mismatched with the abutted ends of the first half. A companion section of the rubber mold overlies the elastomer and strand assembly and is heated to cure the elastomer, resulting in a tension resistant endless O-ring.
The principal object of this invention is to provide an apparatus and method for forming tension resistant O-rings for controlling fluid under high pressure without material damage to the O-ring sealing such pressure. Another purpose is to prevent the O-ring from being blown out of its groove when an O-ring sealed piston leaves its seat.
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Knight Anthony
Pickard Alison K.
Rhea Robert K.
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