Abstract: A conveyor apparatus comprises a plurality of conveyor rail segments joined longitudinally, each of said plurality of conveyor rail segments comprising: a support rail having an upper wheel-seating portion and a lower base portion, the lower base portion having a frustopyramidal cross-sectional shape, a substantially horizontal base panel, and a pair of inwardly angled side panels extending upwardly from opposing edges of the base panel and terminating at the upper wheel-seating portion; and a plurality of wheels translationally secured to the upper wheel-seating portion of the support rail and capable of rotating with respect to the support rail; whereby goods can be transported over the conveyor rail segment.

Abstract: A wheeled conveyor rail segment has a frustopyramidal cross-sectional shaped support rail, which can be made from roll-formed galvanized steel. A plurality of wheels are joined to the galvanized steel support rail and can rotate with respect thereto, enabling goods to be transported by rolling over the conveyor rail segment. The wheel axles can be held in place by axle bearing units that slide into longitudinal grooves in the support rail. All materials can be made electrically conductive, allowing the conveyor rail segment to be used in applications where control of electrostatic discharge is desired, such as handling semiconductor materials and electronic equipment.

Abstract: A container comprising a wall structure defining an opening and an outwardly projecting bead extending peripherally about the opening is disclosed. A plurality of outwardly projecting vent ribs are provided on the bead. A closure which includes a cover member having a downwardly extending skirt is provided for sealing the container. The downwardly extending skirt has an inner peripheral surface which includes a curved member, for contacting the bead and the plurality of vent ribs, and also a tapered member extending downwardly from the curved member. Upon attachment of the cap to the container, the plurality of vent ribs allow for pressure to be released from the container over the bead and about the plurality of vent ribs, while allowing a sealing engagement of the cap with the closure to resume after relief of the pressure from the container.

Abstract: A yarn carrier having an improved surface for having a yarn package wound thereon. The improved surface for the yarn carrier is provided by a plurality of separate, interrelated projections that combine to receive a proper yarn package without entrapment of yarn between projections and while avoiding sloughing of yarn from the carrier.