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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 6439577 | Rotating seals for cell processing systems The invention provides an improved rotating seal apparatus including a plurality of concentrically spaced annular rotating seals. The invention also provides a rotating seal apparatus including a pressurized annular chamber surrounding an annular rotating... | 08/27/2002 |
| 6089575 | Sealed seat for a hydraulic switching element in a mounting space for a direct-controlled cartridge valve in an insertion bore A sealing arrangement for a direct-controlled cartridge valve in an insertion bore, which valve is arranged in a hydraulic system of a device for varying the valve timing of an internal combustion engine wherein to avoid leakages between the individual an... | 07/18/2000 |
| 5632494 | Seal ring and seal device A seal ring fitted into ring grooves provided in the outer peripheral surface of a shaft has side surfaces and an inner circumferential surface which receive hydraulic pressure supplied to the ring groove. The side surfaces of the seal ring are made taper... | 05/27/1997 |
| 5603608 | Methods and apparatus for monitoring progressive cavity pumps A system is providing for simultaneously addressing the problems of deadhead pumping, dry pumping, and seal failure in progressive cavity pumps. The system uses a hydraulic channel (23, 25, 26) which runs from the pump's rotor (5) to the pump's hydraulic ... | 02/18/1997 |
| 5593165 | Circumferential flow channel for carbon seal runner cooling A fluid cooled seal arrangement for a gas turbine engine including a first sealing element coupled to a mechanical housing of the engine, and a second sealing element connected to a shaft rotatable within the housing. The first and second sealing elements... | 01/14/1997 |
| 5421892 | Vertical heat treating apparatus A vertical heat treating apparatus includes a cap body, which is movable up and down, for sealing a treatment vessel that holds objects to be treated. A rotary loading device is provided with a rotary shaft which extends into a through hole provided in th... | 06/06/1995 |
| 5356320 | Seal arrangement for propeller shafts of ships A seal arrangement for controlling any large bearing clearance in the vicinity of a propeller shaft, such as for a propeller drive system for ships with two concentric propeller shafts rotating in opposite directions, has a housing ring for supporting the... | 10/18/1994 |
| 5331884 | Fluid cylinder with cooling passages A space (32) is formed between an inner end of a fitting hole (31) formed in a piston (21) and a piston rod (22) and is positioned radially inside a sealing member (24). By circulating a cooling fluid through the space, the majority of heat which is trans... | 07/26/1994 |
| 5277153 | Soot blower seal-bearing arrangement A soot blower assembly having a horizontally elongate steam supply tube disposed in cantilevered relationship and having a steam discharge opening at the free end, and a horizontally elongate steam discharge lance telescoped axially over the supply tube. ... | 01/11/1994 |
| 5214994 | Seal ring with attached biasing means The design and construction of seals located between a cylinder barrel and a barrel plate rotatable therewith for axial piston fluid translating units have caused an increase in overall unit size, increased stiffness between the barrel and barrel plate an... | 06/01/1993 |
| 5147494 | Seal device for tire pressure-adjusting device A seal device is adapted to be mounted at an area of relative rotation between two mounting portions of a tire pressure-adjusting device. The seal device includes a pair of first and second seal rings which are disposed in opposed relation to each other. ... | 09/15/1992 |
| 5098026 | Easy access pop off relief valve A pulverizer roll wheel assembly comprises a bracket with an opening therein for fixing the outer end of a roller shaft. Bearings mount a roller wheel with pulverizing tire to the inner end of the shaft for rotation of the pulverizer. A lip seal assembly ... | 03/24/1992 |
| 5088890 | Seal construction for use in a turbine engine Leakage of compressed air into the lubrication system of a gas turbine engine is prevented by a seal construction including a housing (44), a hollow shaft (40) extending through the housing (44) and adapted to receive lubricant on its interior (58), and a... | 02/18/1992 |
| 5080157 | Seal for use between relatively rotating members The invention relates to a system for the supply of compressed air to the tire of a commercial vehicle by way of a duct system leading through a non-rotary first member into an annular space and then into a rotary second member. The annular space is forme... | 01/14/1992 |
| 5072948 | Seal assembly for a high speed machining system A high speed machining system (10) including a machine tool (16) mounted on a hollow shaft (14) rotatable at high speeds and the tool (16) being operable at high feed rates. Liquid cutting coolant (22) flows to the tool (16) through the hollow shaft (14) ... | 12/17/1991 |
| 5067753 | Hydrostatically balanced rotary hydraulic connector The fluid-tight coupling is designed for connecting a fixed hydraulic line with a rotary hydraulic line. The fixed line (1) carries on its end an axially movable tubular piston (7) provided with a hemispherical head (8); the rotary line (2) has an offset ... | 11/26/1991 |
| 5064040 | Splined clutch drum mounting An oil passage connection between a shaft and a clutch drum is sealed by intentionally providing an imbalance in the forces acting on splines mounting the clutch drum to the shaft. The sides of at least some of the splines are angled, so that at least som... | 11/12/1991 |
| 5052278 | Fluid cylinder with improved wear rings A fluid cylinder has improved wear rings in a combination that includes a tube having a tubular wall and first and second end caps. The tubular wall defines a cylinder bore that has a central axis. Each end cap also has a bore extending along the central ... | 10/01/1991 |
| 5042846 | Method and system maintaining tightness between parts rotating in relation to one another A system for maintaining a tightness between two parts rotatable relative to each other. The system includes at least two sealing units, with each of the sealing units having at least two possible states or conditions, namely, a first state or condition f... | 08/27/1991 |
| 5018749 | Slide ring seal A slide ring seal to seal about a shaft with respect to a housing, including a slide ring 4 made of PTFE pressed against a counter surface 3, which is relatively rotatable, by means of pressure P of the medium to be sealed and basically extends in radial ... | 05/28/1991 |
| 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 |
| 4846728 | Floating seal arrangement for centrifugal separators and like rotating apparatus Rotating fluid-handling apparatus, e.g., a centrifugal separator has at least first and second elements which rotate relative to the other about a common axis. A seal assembly provides fluid-tight sealing between the elements, which define passages for fl... | 07/11/1989 |
| 4844124 | Hydrostatic rotary connector with pressure-equalizing or compensating element A rotary connector for fluid transmission between a housing part and a shaft via rings has a bypass provided with a valve which connects the intermediate pressure space with either the leakage space or the main pressure space upon a drop in the main press... | 07/04/1989 |
| 4786061 | Safety rotary transmission with face seal Safety rotary transmissions allow the transfer of fluid media from a stationary casing into the inside of a rotating shaft and back. The apparatus, which has only one face seal, is provided with a blocking device which prevents a contact of metallic parts... | 11/22/1988 |
| 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 |
| 4752077 | Sliding ring seal A seal between rotating machine components, such as two hollow shafts, is constructed as a sliding ring seal. An axially and radially effective sealing is achieved by using a centrifugal force for causing a wedging effect on sealing elements which are axi... | 06/21/1988 |
| 4738273 | Apparatus for continuous cooling of elongated elements An assembly of gates is provided at each end of a vat. Two uprights mounted on a lock-chamber floor support respective brackets. Pivoted between the floor and the brackets are gate flaps, the pivot rods of which are fitted in holes in the floor and in the... | 04/19/1988 |
| 4708711 | Pressure centrifuge A pressure centrifuge with a process chamber enclosed by a pressure housing and a drum and a screw concentrically supported. The connections between the process chamber and the atmosphere are located in the area of bearing supports and provided with rotat... | 11/24/1987 |
| 4634134 | Mechanical seal A mechanical seal apparatus for use between a wall and a shaft extending through an opening in said wall with relative rotation occurring therebetween. The shaft extends from a first region at a first pressure into the opening in the wall and a second reg... | 01/06/1987 |
| 4613159 | Pressure-assisted dynamic seal apparatus A pressure-assisted dynamic seal mechanism for sealing two relatively movable members within a tubing string in a well includes a primary seal member having a first cross-sectional area positioned for sealing engagement between the two relatively movable ... | 09/23/1986 |
| 4575015 | Fluid coupling device A thread bobbin holder device having improved sealing between shafts, and consequently less bearing wear. The bobbin holder device is constituted by a bobbin holder body with a bobbin fitted on the outer circumference thereof through a bobbin holder membe... | 03/11/1986 |
| 4524977 | Underwater bearing protection device A collar or collars are opposed to a hub and a sealing member or seal members are mounted on the opposed portions of the collars and the hub. A bushing is attached between the hub and a shaft or the hub and the collars and a ring-like hole to which clean ... | 06/25/1985 |
| 4502699 | Rotating seal for continuous flow centrifuge A rotating seal assembly for a continuous flow centrifuge is described. The seal assembly permits both elements of the rotating seal, the rotating member as well as a nonrotating member to be resiliently mounted and in such a manner that both may rock as ... | 03/05/1985 |
| 4491160 | Pressurized fluid device In a pressurized fluid device a cavity is defined within a container. A piston rod passes through a piston rod guide and seal unit of the container. The piston rod guide and seal unit has an axially inner and an axially outer sealing element sealingly eng... | 01/01/1985 |
| 4489953 | Fire-safe seal for swivel joint A fire-safe seal for use in a swivel joint in a pressurized fluid system subject to fire risk, the seal having both a metal anti-extrusion ring and an annular resilient non-metallic seal member to provide essentially zero fluid linkage at normal operating... | 12/25/1984 |
| 4478247 | Fluid coupling for hollow rotary member A hollow rotary member such as a roller, extruder or the like, requiring constant temperature control by a fluid circulating therethrough, has a hollow shaft with radial inlet and outlet ports communicating with respective compartments of a stationary cou... | 10/23/1984 |
| 4453698 | Stuffing box with O-ring detent for control mechanism of emergency valve A stuffing box for use in a control for an emergency valve for controlling discharge from a liquid storage tank, such as a gasoline storage tank, with the tank having an outlet port with a conduit member coacting with the port in depending relation theref... | 06/12/1984 |
| 4395833 | Sealing and lubricating system for a dredge The dredge is of the type having a bucket wheel, driven by a hydraulic motor through a gearbox, on the front of a bucket wheel carrier hinged at its rear to the dredge hull, and lowered to or raised from working depth by a cable engaged with a lifting she... | 08/02/1983 |
| 4384724 | Sealing device A sealing device for separating two areas from each other positioned in spaces at each side of an opening defined by and between two parts movable in relation to each other and wherein a sealing element sealingly engages one of the parts, and a pressure d... | 05/24/1983 |
| 4384725 | Liquid lubricant seal with oleophobic coating A clearance-type seal for use in rotary fluid handling machinery for preventing lubricant from leaking into working fluid by flowing by capillary action along a fixed surface wherein a coating which is not wetted by the lubricant is placed on the fixed su... | 05/24/1983 |
