Abstract: A centrifuge rotor includes a rotor body having first and second axial ends and a circumferential sidewall extending therebetween. The rotor body has a plurality of wells for receiving sample containers to be processed in the rotor. The rotor further includes an elongate reinforcement extending around the circumferential sidewall of the rotor body along a helical path. At least two portions of the elongate reinforcement interlock at one or more specific points on the surface of the rotor.

Abstract: A bucket is provided for use with a centrifuge rotor. The bucket includes a bucket body that has a side wall and a bottom wall. A pair of projections extend from the side wall on opposing sides of the bucket body and are configured for engagement with the centrifuge rotor. The bucket also includes reinforcing material coupled to the projections for restricting movement of the bucket body relative to the projections during centrifugation on the centrifuge rotor. The projections may include bushings that extend outwardly from the side wall for engaging corresponding pins on the centrifuge rotor. The projection may alternatively or additionally include pins for engaging corresponding journals on the centrifuge rotor. The bucket body may include a pair of diametrically opposed apertures, with each of the projections extending through one of the apertures.

Abstract: A centrifuge rotor includes a rotor body having a central hub and first and second bucket receiving spaces defined on diametrically opposed sides of the rotor body. A first pair of bucket supports is supported by the rotor body for pivotally supporting a swing bucket in the first bucket receiving space, and a second pair of bucket supports is supported by the rotor body for pivotally supporting a swing bucket in the second bucket receiving space. The rotor further includes reinforcing material wound around oppositely disposed ones of the first and second pairs of bucket supports.

Abstract: A centrifuge rotor includes a rotor body having first and second axial ends and a circumferential sidewall extending therebetween. The rotor body has a plurality of wells for receiving sample containers to be processed in the rotor. The rotor further includes an elongate reinforcement extending around the circumferential sidewall of the rotor body along a helical path. At least two portions of the elongate reinforcement interlock at one or more specific points on the surface of the rotor.

Abstract: An extension ladder comprised of a pair of base rails interlocked in a tongue and groove relationship with a pair of slide rails is disclosed. The rails may be manufactured in a variety of shapes including “I” beams, rectangles, boxes, or even ovals or circular shapes. Some embodiments of the ladder include a pulley assembly which is fastened to a fly rail rung and a rope is passed through the pulley to form a continuous loop around the rungs of the base set of rail rungs and the fly fail rungs. In addition, some embodiments include means for attaching tools to the fly rail.

Abstract: A combination step and extension ladder manufactured of prestressed filament wound composite material such as fiberglass is disclosed. The inner and outer side rails are molded, filament wound composite material (fiberglass) wherein the fibers are continuous and angularly oriented with respect to the longitudinal axis of the respective side rails. Hinges are provided on each of the inner side rails of the ladder and hinge actuators are located in the front edges of the outer side rails so that the ladder may be folded, unfolded or locked in either a closed, step ladder or straight extension ladder configuration, by depressing the hinge actuators, irrespective of the longitudinal position of the inner rail sections with respect to the outer rail sections.

Abstract: A device and method for restoring or changing the external appearance of a receptacle, and preferably a planter box refuse container of the like, is disclosed. The device for updating these receptacles is made up of a plurality of joinable substantially rigid composite sheet sections which are sized so that their inner surface substantially conform in dimension to the outer surfaces of the original receptacle and extend over the top surface of the original receptacle. In preferred embodiments the device is formed in two sections each of which surrounds and closes half of the perimeter of the receptacle with the two sections being joined at their respective ends to complete the enclosure.

Abstract: A louvered skylight enclosure and method of manufacture therefor employ a plurality of louvered panels each made of at least two sections. Each such section is made from a cut planar member having aligned angled louvers which are placed in aligned contiguous engagement to form elongated louvers which prevent precipitation from entering the enclosure by precluding direct horizontal paths between the louvers. Use of planar members in the initial step of the method enables more efficient and lower cost fabrication.

Abstract: A skylight structure in which a plastic dome has a peripheral edge flange bonded by a bonding medium to an overlapping flange of a plastic mounting skirt in a manner such that the bonding medium encompasses the outer edge of the peripheral flange and extends between the confronting surfaces of the overlapping flanges to an inner locus edge spaced from the inner edge of the skirt flange, and wherein a sealing strip coextensive with said locus edge is retained between the overlapping flanges by an inner edge portion of the skirt flange. Provision is made for securing the mounting skirt to a roof curb structure with a continuous sealing member being interposed between the curb and an under surface of the peripheral flange. In a modified form two domes have peripheral flanges, bonded together and to a single skirt flange, and with a continuous sealing strip being interposed therebetween.