摘要:
A thermoplastic-rubber polymer alloy contains a tough, wear resistant low friction thermoplastic such as ultra high molecular weight polyethylene, a cured rubber compound such as nitrile rubber, and a lubricant such as graphite in effective amounts to produce a composition which has good wet and dry friction and wear properties. The ultra high molecular weight polyethylene is typically utilized in a sufficient amount so as to form a continuous phase with the thermoset rubber being present as particles dispersed throughout the polyethylene as a discontinuous phase. The polymer alloy is made by dry blending the thermoplastic compound with ground thermoset rubber whereby the rubber is coated, heating and mixing the composition to above the glass transition temperature of the thermoplastic compound and subsequently cooling under pressure. The alloy can be easily transfer molded because of the lubricating action of the heated, softened plastic. The alloy is ideally suited for use as a hard bearing material due to its low coefficient of friction and low wear rate.
摘要:
A water lubricated bearing assembly having a plurality of circumferentially spaced first set of bearing elements with substantislly,flat surfaces and water courses therebetween supporting a shaft for rotation. Certain ones or all of such bearing elements support a second set of bearing element that are moveable radially into supporting engagement with the shaft such that either the first set or the second set of bearing elements are the prime supports for the shaft and wherein such first and second set of bearing elements have different coefficient of friction.
摘要:
A water lubricated bearing assembly having a plurality of circumferentially spaced first set of bearing elements with substantislly,flat surfaces and water courses therebetween supporting a shaft for rotation. Certain ones or all of such bearing elements support a second set of bearing element that are moveable radially into supporting engagement with the shaft such that either the first set or the second set of bearing elements are the prime supports for the shaft and wherein such first and second set of bearing elements have different coefficient of friction.
摘要:
Impact resistant and flame retardant polymer composition, slab-like rectangular solid made of said composition, and composite laminate article having at least one layer of said composition. Composition is preferentially compression molded using a blended particulate feed of relatively high bulk. The polymer composition comprises a maximum of 86 volume percent of ultra high molecular weight polyethylene (UHMWPE), a minimum of 8 volume percent of a flame retardant additive or mixture thereof, and a minimum of 6 volume percent of chopped reinforcing fibers, all volumes referring to the densified (molded) state. In addition the bulk volume of the chopped reinforcing fibers, as measured by a tapped density test, must be a minimum of 27 percent of the final molded volume of the composition (BVPF equal to or greater than 27). The maximum volume % loading of the additives is limited by the requirement that the notched Izod impact strength is a minimum of 7 ft.-lb per inch width. The preferred flame retardant additive is essentially a water insoluble form of ammonium polyphosphate having a water solubility not exceeding 1 gram per 100 grams of water, and the preferred reinforcing fibers are chopped glass fibers about 1/8 to 1/4" inch in length. A significant flame retardant improvement without sacrifice in impact strength is achieved if a thin compressible non-woven fiberglass veil is applied to the top of the particulate feed prior to molding the slab-like solid. The composite layer has first and third layers of essentially rigid compounded high molecular polymers above described, and a second or middle elastomer layer, which is also preferentially flame retarded.
摘要:
A pneumatic jack comprising flat sheets (12, 14) of an elastomeric material with no cords therein peripherally held in place by rigid framing members (16, 18). The jack also includes a valve for communicating with the interior of the sheets. A source of aeroform fluid is utilized for inflating the jack (10) to an enlarged shape to lift a car sufficiently for changing a tire.
摘要:
The present invention is directed to slip joint means (53) for use in connecting pairs of axially spaced risers in an off-shore multi-line riser system that conveys petroleum from a collection point on the ocean floor to a floating buoy for delivery to tankers. The slip joint permits considerable latitude in the movement of the riser system yet assuring leak proof joints at the points of movement by providing elastic seals that facilitate motion between conveying conduits.
摘要:
A bearing assembly for supporting a drive shaft of a ship wherein the shaft is generally to be supported by such bearing assembly in a horizontally extending position. The bearing assembly has a housing with a cylindrical shell mounted therein having a central bore with a longitudinally extending central axis. The shell has a set of circumferentially spaced staves to support the drive shaft. All of the staves are comprised of a slippery polymer alloy and project into the central bore of the shell. The staves are held in place by gripping members comprised of an elastomeric member compressed by a rigid plate.
摘要:
A leaf spring suspension for a motor vehicle wherein the leaf spring has one end pivotally connected to the frame (4) and the other end (12) also connected to the frame via a torsion spring member (28). The torsion spring member has a shaft member (31) which is pivotally connected to the other end of the leaf spring. The torsion spring member has an elastomeric sleeve (30) whose inner bore surface is bonded to the shaft member. The torsion spring member also has an outer shell (32) secured to the sleeve and also connected to the frame. A stop member (45) is mounted on the outer shell for engagement by an abutment (25) member on the bracket member (20) to cut out the torsion spring and place the leaf spring in sole control as the suspension means.
摘要:
A suspension system for a motorized vehicle wherein the weight of the vehicle is supported by torsion springs. The vehicle chassis (l0, ll) supports the drive output shafts and are connected to the driven wheels (20, 2l) via a splined connection. The vehicle wheels have a stationary wheel drum bracket (23) with an upper bracket section (24) and a lower bracket section (25) located respectively above and below the drive shaft connection to the wheel. The torsion spring suspension includes a pair of upper torsion springs (32) interconnecting the vehicle chassis to the upper bracket section of the wheels and a pair of lower torsion springs (57) interconnecting the vehicle chassis to the lower bracket section of the wheels.