Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7887061 | Metal face seal assembly and machine using same A metal face seal assembly for sealing between machine components includes a first subassembly and a second subassembly rotatable relative to the first subassembly. Compressible seals positioned between inner and outer seal members of the subassemblies provide a non... | 02/15/2011 |
| 7347290 | Multi-part energizer for mechanical seal assembly An energizer for a mechanical seal assembly for use in a drill bit is disclosed. The energizer is a composite of at least two resilient materials, one having a durometer hardness that is greater than the other. The material contacting a journal provides relatively h... | 03/25/2008 |
| 7341258 | Cammed seal assembly with sealing ring having an angled leg portion and foot portion with elastomeric energizer element A seal assembly seals first and second operational surfaces spaced apart by a gap. The first surface includes a seal groove having a base surface and first and second side surfaces. A sealing element in the seal groove has a foot portion extending parallel to the ba... | 03/11/2008 |
| 7044470 | Rotary face seal assembly A rotary seal assembly including a first member having a sealing face and a second member having a sealing face with a number of pumping grooves therein. At least a first set of pumping grooves stating proximate a center portion of the sealing face and extending out... | 05/16/2006 |
| 6749202 | Face seal cartridge A face seal cartridge to facilitate the operation of a shaft and a bore forming a sealed rotating assembly is disclosed. The face seal cartridge includes first and second sealing members to form the face seal, and first and second o-rings and cartridge walls which a... | 06/15/2004 |
| 6583376 | Sealing apparatus used in a wire cut electric discharge machine A wire cut electric discharge machine that includes a machining tank storing a machining fluid, an upper arm disposed at an upper portion of the machining tank, a lower arm inserted into the machining tank, a wire electrode extending between the upper arm... | 06/24/2003 |
| 6517078 | Face seal device with additional mass for high rotational speeds A face seal device for use with components rotating at a high rotational speed includes a non-rotating face seal ring (5) and a rotary face seal ring (11). The rotary face seal ring is mounted in a loose fit for common rotation with a rotating component a... | 02/11/2003 |
| 6293555 | Secondary seal for non-contacting face seals A Non-contacting face type pressure sealing assembly for shafts rotating at high speeds, such as for example those of centrifugal compressors, such assembly having at least two mating sealing rings. One of the subject sealing rings is fixed to the rotatin... | 09/25/2001 |
| 6135458 | Static pressure non-contact gas seal A static pressure-type generating non-contact gas seal in which a diameter d2 of a second outer circumferential portion (42) of a stationary seal ring (4) in contact with a second O-ring (62) is made smaller than the diameter d1 of a first outer circumfer... | 10/24/2000 |
| 6068263 | Split mechanical face seal with resilient pivoting member A split mechanical face seal that provides fluid sealing between a housing and a rotating shaft includes first and second seal rings each having at least two seal ring segments and a radially extending seal surface. The seal ring surfaces of the seal ring... | 05/30/2000 |
| 6026917 | Earth-boring bit with improved bearing seal An earth-boring bit has a bit body and at least one bearing shaft depending inwardly and downwardly from the bit body. The bearing shaft has a base where it joins the bit body. At least one cutter is mounted for rotation on the bearing shaft and has radia... | 02/22/2000 |
| 5984313 | Sliding ring seal A sliding ring seal includes a counter ring and an adjusting ring configured as a buttress. The counter ring and the adjusting ring are interconnected in a manner that does not allow for relative rotation, and they enclose a shaft to be sealed, also in a ... | 11/16/1999 |
| 5833441 | Windshield wiper washer motor for use in a vehicle A system and method for sealing a pressure area in a washer pump is disclosed. The system and method provides designed interference and contact points between a plurality of adjacent walls which are arranged to define a serpentine channel and which are in... | 11/10/1998 |
| 5722667 | Seal assembly for use between planar surfaces having opposed grooves to receive and hold the seal assembly A seal assembly for use between a pair of abutting planar surfaces with opposed grooves which combine to form a seal groove to receive the seal assembly. The seal assembly includes a stiffly flexible body element having portions which surround, protect an... | 03/03/1998 |
| 5704719 | Street sweeper bearing with wear resistant resiliently biased face seal A bearing assembly having primary seals between inner and outer races on opposite sides of roller elements and an auxiliary face seal on at least one end thereof. The auxiliary seal includes a cap fixed to the inner race, and axially movable face seal mem... | 01/06/1998 |
| 5571268 | Universal split mechanical seal A split mechanical seal including first and second seal ring assemblies, at least one resilient biasing element and at least one axial biasing element. The first and second seal ring assemblies each include a seal ring having two segments that are resilie... | 11/05/1996 |
| 5560621 | Asymmetrical slide ring seal assembly A slide ring seal assembly includes first and second machine components each having an annular clamping face coaxial with the rotary axis of the assembly; and first and second slide rings including respective inner and outer peripheral clamping faces each... | 10/01/1996 |
| 5520257 | Bit with ball plug compensator having pressure relief means A shaft boring bit has a bit body with at least one saddle member secured to the bit body. The saddle receives and supports the ends of a journal member. A cutter is mounted for rotation on the journal member and an anti-friction bearing is disposed betwe... | 05/28/1996 |
| 5360076 | Dual metal face seal with single recessed energizer An improved rigid face seal that minimizes pressure fluctuations in the lubricant in the vicinity of the seal assembly. The assembly has a first ring with a radial seal face that opposes and engages an opposed radial seal face of a second rigid ring. A fi... | 11/01/1994 |
| 5316351 | Hose swivel A swivel for transmitting fluid be sing and female housing includes a bearing assembly and seal ring assembly. The seal ring assembly comprises a pair of seal rings each including a plastic ring having a generally U-shaped cross-sectional configuration de... | 05/31/1994 |
| 5251913 | Track roller for tracked vehicles Sealed roller, particularly for tracked vehicles, including a supporting shaft which is inserted with a tight fit in respective blind bushes preset for fixing to a supporting structure, and a roller body rotatably supported about the shaft.... | 10/12/1993 |
| 5161806 | Spring-loaded, hollow, elliptical ring seal A canted-coil spring-loaded ring seal assembly including a plurality of coils having a major and a minor axis and canted along a center line defined by an intersection of the major and minor axes along with an elastic material, disposed around and between... | 11/10/1992 |
| 5080183 | Seal assembly for roller cutter drill bit having a pressure balanced lubrication system A seal assembly (46) for a rotary drill bit (10) having a pressure balanced lubrication system is mounted in a pocket (48) between a journal (16) and a roller cutter (18). The seal assembly (46) has a pair of rigid seal rings (50, 52) in sliding sealing c... | 01/14/1992 |
| 5040624 | Seal assembly for roller cutter drill bit having a pressure balanced lubrication system A seal assembly (46) for a rotary drill bit (10) having a pressure balanced lubrication system is mounted in a pocket (48) between a journal (16) and a roller cutter (18). The seal assembly (46) has a pair of rigid seal rings (50,52) in sliding sealing co... | 08/20/1991 |
| 5020809 | High-speed easy-maintenance split seal A mechanical split seal includes a tapered carbon split seal ring and a silicon carbide split mating ring. The tapered seal ring is compressed by a tapered seal ring shell which has a split "O" ring disposed in the taper to provide even force and improved... | 06/04/1991 |
| 5009519 | Sealing assembly for relatively movable members A sealing member for relatively movable, e.g., rotating or reciprocating, members comprises a pair of annular rings each with a radially extending wall and an axially extending wall defining an annular seal gland. An elastic spring member compression-load... | 04/23/1991 |
| 5005989 | Roller bit A roller bit comprises a plurality of legs each of which has a longitudinally extending pin. A cutting cone is rotatably mounted on each of the pins and a prefabricated sealing insert is fixedly connected at a longitudinally inner end of each of the pins.... | 04/09/1991 |
| 4940340 | Sealed ball bearing mechanism A bearing seal device seals the end of a ball bearing mechanism having an inner race engaging a cylindrical shaft, a plurality of balls, and an outer race. A flat elastic sealing ring abutts the inner race, which is inset, and bears against a sealing surf... | 07/10/1990 |
| 4923020 | Rock bit with rigid face seals and recessed energizers An improved mechanical face seal for rock bits using rigid rings and energizers placed in recesses or grooves in the cutter and bearing shaft. The minimum diameter of the shaft groove is substantially equal to the relaxed inside diameter of the shaft ener... | 05/08/1990 |
| 4903786 | Earth boring bit with improved two piece bearing and seal assembly An earth boring bit having an improved two piece bearing and seal assembly containing a cantilevered bearing lug that is threaded to receive a mating bearing sleeve, the lug having a transverse shoulder intersected by a mouth on the sleeve to define a bea... | 02/27/1990 |
| 4844483 | Floating seal device A floating seal device includes a fixed side O-ring held by a fixed side seal retainer, a rotary side O-ring held by a rotary side seal retainer, and fixed side and rotary side seal rings pressed against each other by the respective O-rings so that their ... | 07/04/1989 |
| 4824123 | Mechanical face seal for rock bits A metal-to-metal seal for a rotary cone rock bit consists of pre-lapped metal sealing surfaces formed on opposing seal rings prior to assembly of the seal rings into seal cavities formed between the rotary cones and their respective journal bearings. A fi... | 04/25/1989 |
| 4796858 | Dual seal valve A dual seal valve having a bubble-tight primary seal and a metal-to-metal secondary seal for sealing engagement with a rotating valve element. The primary seal is preferably a composite seal comprising a relatively hard, high lubricity element bonded to a... | 01/10/1989 |
| 4762189 | Seal and seal shield assembly for rotary drill bits A seal and seal shield assembly for rotary drill bits having a journal member comprising a first bearing member, and a rolling cutter with a bore having an open end rotatably mounted thereon comprising a second bearing member. The rolling cutter has a cou... | 08/09/1988 |
| 4753304 | Volume and pressure balanced rigid face seal for rock bits An earth boring bit having a rotatable cutter secured to a lubricated, cantilevered bearing shaft, sealed with an improved pressure compensating rigid face seal assembly. The assembly has a rigid ring with a radial face that opposes and engages a radial f... | 06/28/1988 |
| 4753303 | Earth boring bit with two piece bearing and rigid face seal assembly An earth boring bit having a cantilevered bearing shaft and a compensator system to equalize the pressure of the lubricant with the hydrostatic pressure of the drilling fluid surrounding the bit. A rigid face seal assembly, positioned between the cutter a... | 06/28/1988 |
| 4747604 | Rotary shaft seal for drill bit cutters A rotary shaft seal for the rotary cutter of a each boring drill bit includes a fixed seal ring fitted securely in the cutter and having an end face which includes a first tapered surface, a floating seal ring having an end face, which includes a second t... | 05/31/1988 |
| 4687350 | Sealed bearing for ring roller of cold pilger rolling mill A sealed bearing arrangement for the ring rollers of a cold rolling mill is provided with a rolling bearing mounted on a journal of a rolling shaft and seated in the bore of a chock, and a pair of housing covers fastened to said chock on respective sides ... | 08/18/1987 |
| 4640559 | Bearing seal for endless track rollers In an improved roller, a sealing arrangement (9) at either end comprises a metal annular element (11) which is able to shift axially, and which incorporates a smooth, slender frontal rim (14) breasted with the outward-facing frontal surface of the outer r... | 02/03/1987 |
| 4625975 | Installation for seals Seals between a wheel and a cover which rotate in relation to each other are installed under utilization of auxiliary equipment which includes a ring with annularly distributed bores and held against an abutment surface in the wheel while another ring of ... | 12/02/1986 |
