Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1975-01-17
1976-10-05
Rothberg, Samuel B.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
F16J 1532
Patent
active
039841138
ABSTRACT:
A bidirectional hydrodynamic polytetrafluoroethylene shaft seal and a method for manufacture thereof. An annular polytetrafluoroethylene sealing member has a radially outer annular planar portion and a radially inner annular shaft-sealing non-planar portion inclined to the planar portion. An annular metal case clamps the planar portion in place, and the inner portion has a shaft-engaging side with an inner edge and a pair of spaced-apart coaxial projecting circular ribs. A first circular rib lies adjacent to the inner edge, and a second circular rib lies farther from the inner edge. A series of curved segmental ribs, each having a pair of ends spaced toward the first rib from the second rib and curved in between its ends toward the first rib, extend in to and intersect the first rib. To make the seal, a flat annular wafer of polytetrafluoroethylene of constant thickness is coined at an annular inner portion adjacent the inner periphery to provide the first and second circular ribs and a series of straight segmental ribs, each of which extends tangential to the inner side of the inner rib, thereby intersecting the inner rib, the crest of the straight ribs projecting out further than the crest of the inner rib. Then the annular inner portion is formed into a generally frustoconical shape, whereby the straight ribs appear as curved ribs. The frustoconical portion is further flexed on installation on a shaft to be generally cylindrical from at least the outer rib to the inner periphery.
REFERENCES:
patent: 3640542 (1972-02-01), Mowat
patent: 3672690 (1972-06-01), Berens
patent: 3801114 (1974-04-01), Bentley
patent: 3857156 (1974-12-01), Clark
patent: 3868105 (1975-02-01), Bentley
patent: 3873104 (1975-03-01), Bainard
patent: 3923315 (1975-12-01), Hadaway
Federal-Mogul Corporation
Rothberg Samuel B.
LandOfFree
Bidirectional hydrodynamic polytetrafluoroethylene seal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Bidirectional hydrodynamic polytetrafluoroethylene seal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bidirectional hydrodynamic polytetrafluoroethylene seal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-651604