Shaft sealing ring

Details Shaft sealing ring Shaft sealing ring

2005-03-01

2005-03-01

Pickard, Alison (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Circumferential contact seal for other than piston

C277S549000, C277S559000, C277S560000, C277S562000

Reexamination Certificate

active

06860486

ABSTRACT:
A shaft sealing ring for a shaft comprises a sealing lip made of an elastomeric material or a PTFE compound and dimensioned as to be flaccidly bendable. The flexural elasticity is selected such that it will just be sufficient to press a sealing portion of the sealing lip into sealing engagement with the periphery of the shaft. The sealing portion of the sealing lip engages the periphery for a predetermined length. In the sealing portion, the sealing lip is provided along its circumference, at the side of the shaft, with endless, undulating return channels at least throughout this length. These channels return any medium escaping during rotation of the shaft to the space to be sealed. The return channels do not communicate with the surroundings of the shaft sealing ring. No seperate contact pressure means, such as a helical ring coil spring is required to press the sealing lip into engagement with the shaft.

REFERENCES:
patent: 5921555 (1999-07-01), Johnston
patent: 6401322 (2002-06-01), Matsushima
patent: 6520507 (2003-02-01), Pataille et al.
patent: 20020158421 (2002-10-01), Johnston

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