Class 277/417 - Formed by multiple washers

Subclass of Class 277 - Seal for a joint or juncture
Definition: Labyrinth wherein the labyrinth is a plurality of substantially
No. of patents: 19
Last issue date: 05/24/2011

Number	Title	Issue Date
7946591	Combined labyrinth seal and screw-type gasket bearing sealing arrangement A bearing sealing arrangement for rotating machines uses a radially-acting labyrinth seal (2) to minimize bearing lubricant leakage and an axially-acting screw-type gasket (3) to return what fluid escapes through the labyrinth seal to the bearing (1...	05/24/2011
7374211	Rotary joints Rotary joints are provided, to allow fluid to flow from a stationary member to a rotating member. The rotary joints include a housing, configured to fit over the rotating member, a rotatable coupling disposed within the housing, configured to be fixedly attached to ...	05/20/2008
7178806	Cinchpac self-loading rotary shaft seal A seal for a conveyor drive which has an elastomer which is compressed between a cap ring and a housing. ...	02/20/2007
7150477	Rotary joints Rotary joints are provided, to allow fluid to flow from a stationary member to a rotating member. The rotary joints include a housing, configured to fit over the rotating member, a rotatable coupling disposed within the housing, configured to be fixedly attached to ...	12/19/2006
6688864	Oil leak prevention structure of vacuum pump A vacuum pump draws gas by operating a gas conveying body in a pump chamber through rotation of a rotary shaft. The vacuum pump has an oil housing member. The oil housing member defines an oil zone adjacent to the pump chamber. The rotary shaft has a proj...	02/10/2004
6364316	Dual pressure balanced noncontacting finger seal An annular sealing apparatus is disclosed for disposition in cooperation with a body defining a bore and a rotating member rotatably received in the bore, the bore and rotating member bounding a high fluid pressure region and a relatively lower pressure f...	04/02/2002
6247702	Bearing shaft seal A bearing shaft seal assembly for an electric motor positioned within an end frame of the motor in order to inhibit the passage of external contaminants axially along a shaft extending out of an end frame into the interior of the motor. The seal assembly ...	06/19/2001
6082738	Rotatable seal element for a rotary machine A rotatable seal element 38 is formed of at least two circumferentially continuous rings 48,50. The rings have decreased thickness T2, T3 in the outward direction. Various construction details are developed which effect the level of ...	07/04/2000
5984314	Rotatable seal element for a rotary machine A rotatable seal element 38 is formed of at least two circumferentially continuous rings 48,50. The rings have decreased thickness T2, T3 in the outward direction. Various construction details are developed which effect the level of ...	11/16/1999
5904356	Labyrinth seal with contaminant purging passageway for bearing housings An improved seal assembly for a bearing housing is provided and includes piston rights which do not contact the rotating shaft, and a grease supply passageway connected to a labyrinth, and a grease purging passageway exiting axially through the seal assem...	05/18/1999
5078175	Valve A valve comprises a first relatively fixed valve component assembly surrounding a second valve component assembly which is relatively movable within said first assembly. A seal is provided between the first and second valve component assemblies and a barr...	01/07/1992
5071138	Laminated finger seal An annular seal apparatus of the labyrinth type includes at least a pair of axially stacked thin diaphragm members. Each of diaphragm members includes a planar array of radially and circumferentially extending fingers separated by gaps. The pair of diaphr...	12/10/1991
5046718	Floating ring labyrinth-type dynamic shaft seal and process for using same A process for providing a seal around a reciprocating and/or rotating shaft as in an apparatus for manipulating a fluid at least in part by the rotary and/or reciprocal motion of the shaft, involving the insertion of substantially identically configured f...	09/10/1991
4773440	Exhaust gas brake system The present invention relates to an exhaust gas brake system of slide type for an improvement in construction that a coupler cover member has a space chamber defined in the inner circumference of a central opening thereof through which a piston rod of a p...	09/27/1988
4750548	Device for sealing retractable soot-blower lances Device for sealing retractable soot-blower lances at the point of insertion through the wall of a heat exchanger. A labyrinth box consists of lamellas. The lamellas narrowly surround the soot-blower lances and are secured at the outer edge in a wall box. ...	06/14/1988
4302019	Labyrinthine mechanical seal A labyrinthine mechanical seal in a bore of a casing for a rotatable shaft which is substantially free of axial forces and mounted for axial movement while carried by bearings in the casing. The seal includes a first group of discs arranged in an axial sp...	11/24/1981
4290610	Labyrinth seal A labyrinth seal of a shaft comprises ring plates arranged in an alternating fashion in parallel with one another and coaxially with the shaft. One set of plates are rigidly fixed to the shaft and the other set of plates are fixed to a stationary sleeve. ...	09/22/1981
4155558	Completely fluidtight and frictionless shaft seal packing A packing apparatus comprising: a plurality of thin, annular packing members each embracing the arched portions in the cross section being so arranged in an axial layer, with their peripheral parts held in contact with a shaft, so as to form gaps with adj...	05/22/1979
3945649	Completely fluidtight and frictionless shaft seal packing Shaft seal packing which has a large number of thin annular packing members uprightly set onto, and closely fitted to, a shaft in axial layers by compressing them only axially with respect to each other in a stuffing box, the inner diameter of the annular...	03/23/1976

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Class 277/417 - Formed by multiple washers