Pipe joints or couplings – End to side or plate – Screw
Reexamination Certificate
2005-07-12
2005-07-12
Nicholson, Eric K. (Department: 3679)
Pipe joints or couplings
End to side or plate
Screw
C285S917000, C123S468000
Reexamination Certificate
active
06916048
ABSTRACT:
The fitting has a high-pressure fuel supply conduit, and the injector has a hollow body having a threaded seat engaged by a threaded portion of the fitting. The fitting has a shoulder located between the threaded portion and another portion of the fitting, and the hollow body has a shoulder on a non-recessed outer surface of the hollow body. The two shoulders are precision machined so they are parallel in use; and the usual high-pressure fuel sealing washer is inserted between the two shoulders so machined. More specifically, the shoulder of the fitting has a groove housing the washer, and the shoulder of the hollow body undergoes circular spot facing to form a series of circular cavities concentric with the axis of the threaded seat and characteristic of Ra=1.6 surface roughness.
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C.R.F. Societa Consortile per Azioni
Morgan & Finnegan , LLP
Nicholson Eric K.
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