Abstract: A pressure-tight assembly which can constitute a dummy block for an extension ram is made up of two coaxial components arranged in spaced relation to accommodate at least one peripheral seal. One component has a small flat bearing surface extending at right angles to the axis and the other component has a bearing surface which is inclined to the axis. The resultant of the forces exerted on the seal which is imprisoned between said bearing surfaces causes preferential creep deformation of the seal towards the exterior of the assembly.
Abstract: A field dressable inflatable packer which includes a resilient inflatable sleeve formed of a rubber tube having a plurality of spaced-apart cord members extending longitudinally over the entire length of the tube and clamp means for disconnectably connecting the resilient sleeve in operable position over an inner tubing section which clamp means are constrained in position on the tubing string during operation of the packer but which may be removed for repair or replacement of the resilient sleeve.
Abstract: A multiple element seal ring system comprising a pair of pressure non-deformable split rings and a deformable expander ring adapted to be received in a groove. The split rings are provided with relatively narrow inner surfaces spaced from the groove bottom wall to provide clearances of short axial extent therebetween for restricting deformation of the expander ring within its elastic limits.
Abstract: A shaft seal assembly employing oil breakdown bushings including bushing supports having a radial spring constant which permits the bushing to move radially with the shaft as the shaft is deflected and an axial spring constant whereby the bushing is able to resist axial movement when under pressure.
Abstract: The present disclosure is directed to a mobile batching plant having a primary frame carrying the cement storage, batching and weighing system and a plurality of rigidly connectable and detachable secondary modular frames connected in tandem each secondary modular frame carrying a combination batch and storage hopper having dispensing gates with an endless aggregate conveyor beneath the hopper gates. One sand and from one to three aggregate modules can be carried without affecting plant width. A fifth wheel for connection to a tractor is carried by the primary frame and a transport wheel assembly is connected to the last modular frame to render the entire plant transportable over the highway. The hoppers carried by the modular secondary frames are loadable by a small front end loader without the need of ramps because of their low profile.
Abstract: In the manufacture of a gasket wherein a rigid, compression-limiting component is formed by molding in situ against the side of a preformed compressible gasket component to bond therewith, a narrow channel is pressed into the face of the gasket component during the molding operation. The gasket material is permanently deformed in this channel, which runs on the gasket face adjacent the edge of the side to which the rigid component is molded. The channel provides a durable, reproducible demarcation between the compressible and rigid components. Formation of this channel in molding has been found to prevent flashing of the material being molded, over the gasket face.
Abstract: A seal assembly has a pair of duo-cone seals positioned by a like pair of torics for axial loading. An insert member of flexible material is located within the member defining one of a pair of confronting inclined surfaces operatively containing the torics. The flexible insert members are not susceptible of oxidation when exposed to the atmosphere.
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.
Abstract: Methods, apparatus, and improved structure having as their common basis the sequence of collapsing a piston ring in a fixture approximating engine bore diameter, and separately lapping a major portion of the ring side and a remaining locality --narrow in width, of band size and preferably line size-- of the side of the ring while it is so collapsed, until circumferentially continuous portions of the side are flat in the range of at least about 10 to five light bands. That is, out-of-flatness of the two circumferentially continuous portions, stated another way, is limited in each case to a range equivalent to about five to 10 light bands at maximum, at standard inspection wave length.
Abstract: A scraper-type shaft seal comprises an outer C-section ring which is received in an inwardly open groove in a housing and which itself receives the outer periphery of an inner ring formed with a lip which engages the outer surface of a shaft to be sealed. One of the rings is formed of flexible hard material and the other of the rings is relatively supple so that the lip of the inner ring can readily follow lateral deflections of the shaft. The outer surface of the outer ring is generally frustoconical so that when fit into a cylindrical groove the lip is prestressed inwardly.
Abstract: A piston and seal assembly is adapted to work in a cylinder, particularly a master cylinder of a vehicle braking system, the seal having a lip which sealingly engages the cylinder bore on the pressure stroke, an inner portion mounted on the piston, and an interconnecting portion between the lip and the inner portion. A retaining member holds the seal on the piston and engages the interconnecting portion during the return stroke of the piston so that the seal flexes about the line of engagement between the retaining member and the interconnecting portion to provide a recuperation flow path between the lip and the cylinder bore.
Abstract: An improved open ended frusto conical sleeve member suitable for use as a sealing interface between the co-operating mating surfaces of a tapered male/female push fit type glassware joint is disclosed. The sleeve member, which has a wall thickness of less than 1.5 mm includes at least two integral, generally circumferential ribs and an external annular flange for gripping during assembly and disassembly of a joint incorporating the sleeve member. The sleeve member, the ribs and the annular flange are constructed from a material having a static coefficient of friction of less than 0.2, a hardness of from 50 to 80 on the Shore D scale, and which is resistant to thermal degradation up to 200.degree.C and to structural degradation when immersed in a corrosive chemical for 12 hours at 50.degree.C.
Abstract: An improved rotating bellows seal is disclosed which includes a bellows core having an annular mounting plate at one end adapted to drivingly and sealingly engage a shaft and a bellows seal ring on the other end to sealingly engage a mating seal ring. The mating and bellows seal rings are provided with conical inside diametral surfaces to prevent leakage fluids from entering the bellows core.
Abstract: Apparatus for estimating the range of a golf course flagstick in terms of a number of paces which is common to all users. An opaque body adapted to be held in the hand is so shaped that its profile has two parallel ridges which face in the same direction, are separated by 47/64 inch, and lie on the same side of a perpendicular line along which they terminate. In use, the apparatus is held at arm's length so that the ridges are horizontal and the lower ridge is aligned with the lowermost visible extremity of the flagstick. In the special case when the upper ridge is found to be in line with the uppermost end of the flagstick the observer is 100 paces from the flagstick. In the general case the distance to the flagstick in relation to 100 of the user's paces then consists in the ratio of the observed distance between the ridges to the observed height of the flagstick.
Abstract: A concrete mixer truck and a concrete mixer trailer with each adapted for mixing a concrete mix in transit and at a construction site and for discharging the mix at the site. The concrete mixer trailer towed by a concrete mixer truck includes a leading axle, an intermediate axle, and a trailing axle mounted on a trailer frame in longitudinally spaced relation and each having dual wheels on each of the opposite ends thereof for substantially equal weight distribution thereon. A longitudinally adjustable tongue structure has one end thereof pivotally connected to a leading end portion of the trailer frame for vertical swinging movement and the other end thereof adapted to be connected to a concrete mixing truck.
Abstract: In the preferred form the present invention is directed to a cavity having a side opening and a rack adapted so as to be rotatable between a position within the cavity and a position outside of the cavity. The rack is mounted on a threaded member having a vertical axis whereby rotation of the threaded member causes the rack to pivot between the two aforesaid positions and further rotation of the vertical adjustment member causes said rack to be vertically displayed with respect to the cavity.
Abstract: A catoptric projection system in which a projection lens and a spherical convex mirror are arranged with their optical axes intersecting at a point on the mirror at an angle with respect to each astigmatism so that an image is projected from the film plane with light after reflection from the mirror onto a light transmissive screen, thereby it being made possible to achieve a much-desired increase in the magnification of image projected on the screen without involving any increase in the magnification power of the projection lens or in the distance between the film plane and the screen. There is provided a cylindrical refracting surface disposed between the projection lens and the mirror to perform a refractive action in a plane containing both of their optical axes and to contribute an amount of astigmation which is balanced out by that of astigmatism introduced by the convex mirror.
Abstract: Sealing apparatus which includes an elastic seal having end portions and at least one intermediate portion, all of such portions being interconnected yet axially spaced from each other whereby the seal is compressible. A projection is provided upon one end surface of the seal which is adapted to be disposed along the end portion of a bushing and extend within an annular space defined between the bushing and the link of the track shoe system, whereby penetration of earth and sand within a counterbored portion of the shoe system is positively prevented. An annular thrust ring may also be disposed within the counterbored portion of the system in a concentric manner with respect to the seal, the ring being disposed radially inwardly thereof, and in this manner, when large thrust forces are exerted upon the system, the thrust ring, interposed between the bushing and a bottom wall of the counterbored portion, will counteract the same.
Abstract: A sealing cartridge for rotating shafts is described, comprising a housing, an inwardly disposed compressed mechanical packing, and an outwardly disposed radial pressure lip seal. The two types of sealing elements cooperate to permit adequate lubrication of the shaft while yet obtaining complete containment of the functional fluid.
February 14, 1975
Date of Patent:
August 17, 1976
Robert John Boyle, Howard Lewis Rucker, Alex Anthony Mastro, Thomas Peter Jackson
Abstract: A resilient shaft sealing lip is biassed to bear against a shaft when the shaft is at rest to prevent egress of lubricating liquid past the sealing lip, but upon rotation of the shaft at its rated speed the lip lifts so that sealing friction forces are limited to those generated by liquid friction and a return conveyor mechanism provided in combination with the lip, is effective upon shaft rotation to return escaping liquid and thereby take the place of a tight sealing lip for this purpose. The arrangement thereby provides reduced wear, reduced heat generation and reliable prevention of leakage with long service life consistent with economical and modular construction.
June 13, 1974
Date of Patent:
August 10, 1976
Firma Feodor Burgmann Dichtungswerk, Firma Carl Freudenberg
Feodor Burgmann, Klaus Safft, Hans Forch, Gerd Upper