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A moisture resistant package for storing and transporting sterile items, such as specimens of human or animal tissue, comprises an inner tray that fits within a moisture resistant outer tray. The inner tray has a cavity for storing the specimen. The specimen is enclosed within the cavity by a non-po

A moisture resistant package for storing and transporting sterile items, such as specimens of human or animal tissue, comprises an inner tray that fits within a moisture resistant outer tray. The inner tray has a cavity for storing the specimen. The specimen is enclosed within the cavity by a non-porous inner lid that is sealed to the inner tray by an adhesive to create a moisture and microbial contaminant resistant environment that prevents moisture uptake into the specimen. The inner tray is enclosed within a complementary shaped cavity of the outer tray by an outer lid sealed to the outer tray to complete the assembly of the package. Thereafter, the package is terminally sterilized (using gas or radiation) so that the inner tray can be introduced into a sterile environment when it is removed from the outer tray. In a preferred embodiment, the inner lid includes at least one through hole to reduce the pressure differential that may occur between the outer tray cavity and the inner tray cavity, which differential may otherwise case premature lifting and separation of the inner lid from the inner tray. In addition, the outer tray and the inner tray may be formed of a sheet of transparent thermoplastic material, such as glycerol modified polyethylene terephthalate so that the specimen can be viewed without opening the package. Preferably, the sheet of material for the inner tray and the outer tray is laminated with a film of moisture barrier material and is deep drawn into a three dimensional die, while substantially maintaining the moisture barrier integrity of the trays.

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A moisture resistant package for storing and transporting sterile items, such as specimens of human or animal tissue, comprises an inner tray that fits within a moisture resistant outer tray. The inner tray has a cavity for storing the specimen. The specimen is enclosed within the cavity by a non-po

A moisture resistant package for storing and transporting sterile items, such as specimens of human or animal tissue, comprises an inner tray that fits within a moisture resistant outer tray. The inner tray has a cavity for storing the specimen. The specimen is enclosed within the cavity by a non-porous inner lid that is sealed to the inner tray by an adhesive to create a moisture and microbial contaminant resistant environment that prevents moisture uptake into the specimen. The inner tray is enclosed within a complementary shaped cavity of the outer tray by an outer lid sealed to the outer tray to complete the assembly of the package. Thereafter, the package is terminally sterilized (using gas or radiation) so that the inner tray can be introduced into a sterile environment when it is removed from the outer tray. In a preferred embodiment, the inner lid includes at least one through hole to reduce the pressure differential that may occur between the outer tray cavity and the inner tray cavity, which differential may otherwise case premature lifting and separation of the inner lid from the inner tray. In addition, the outer tray and the inner tray may be formed of a sheet of transparent thermoplastic material, such as glycerol modified polyethylene terephthalate so that the specimen can be viewed without opening the package. Preferably, the sheet of material for the inner tray and the outer tray is laminated with a film of moisture barrier material and is deep drawn into a three dimensional die, while substantially maintaining the moisture barrier integrity of the trays. aid drum, both said ends of said shaft being mounted against rotation in pivot spheres in socketed mounting blocks fixedly mounted on said support structure. 3. The conveyor pulley of claim 2 wherein the spheres are restrained against rotation solely by clamping pressure between two parts of said mounting blocks. 4. The conveyor pulley of claim 1 wherein the sphere is restrained against rotation solely by clamping pressure between two parts of said block. 5. The conveyor pulley of claim 4 including means for positively restraining said sphere from rotation about said axis of rotation. 6. The conveyor pulley of claim 5 wherein said means for positively restraining said sphere comprise an axially directed slot in an outer surface of said sphere, said slot being defined by chordally extending walls and a bottom wall, and a pin carried by said block and extending within the compass of said slot between and closely adjacent said walls. 7. The pulley of claim 1 wherein the sphere is provided with a non-circular seat and the end of the shaft is formed complementarily to provide a close but slideable fit. 8. A method of making and installing a conveyor pulley comprising mounting a drum for rotation about a substantially fixed axis of rotation on a shaft, mounting an end of said shaft against rotation about said axis of rotation in a pivot sphere, loosely mounting on a support structure for said pulley a mounting block having a socket formed complementarily to said pivot sphere, loosely mounting said pivot sphere in said mounting block, aligning said pulley and thereafter fixedly mounting said mounting block on said supporting structure, and restraining said sphere against rotation in said mounting block. 9. A method of making and installing a conveyor pulley comprising mounting a drum having a pair of axial ends for rotation about a substantially fixed axis of rotation on a pair of shaft ends wherein each shaft end projects from one of the axial ends of the drum, mounting each shaft end against rotation in a pivot sphere, mounting on said support structure two mounting blocks, one for each sphere, loosely mounting said pivot spheres in said mounting blocks, aligning said pulley and thereafter fixedly mounting both mounting blocks and restraining both pivot spheres against rotation in said mounting blocks. 10. A method of making and installing a conveyor pulley in which a drum is mounted for rotation about an axis of rotation on a shaft mounted against rotation, comprising mounting an end of said shaft against rotation about said axis of rotation in a pivot sphere, loosely mounting on a support structure for said pulley a mounting block having a socket formed complimentary to said pivot sphere, loosely mounting said pivot sphere in said mounting block, aligning said pulley and thereafter fixedly mounting said mounting block on said supporting structure, and restraining said sphere against rotation in said mounting block, wherein said mounting block is made with upper and lower parts separated by a narrow gap when the sphere is in place, said upper and lower parts being joined by bolts and nuts, and the method includes torquing the nuts to a predetermined torque value to produce a desired pressure to clamp the sphere between said upper and lower parts after the pulley is in place. 11. A method of making and installing a conveyor pulley in which a drum having a pair of axial ends is mounted for rotation about an axis of rotation on a pair of shaft ends, wherein each shaft end projects from one of the axial ends of the drum, the method comprising mounting each shaft end against rotation in a pivot sphere, mounting on said support structure two mounting blocks, one for each sphere, loosely mounting said pivot spheres in said mounting blocks, aligning said pulley and thereafter fixedly mounting both mounting blocks and restraining both pivot spheres against rotation in said mounting blocks, wherein said mounting blocks are made with upper a nd lower parts separated by a narrow gap when the sphere is in place, said upper and lower parts being joined by bolts and nuts, and the method includes torquing the nuts on both mounting blocks to a predetermined torque value to produce a desired pressure to clamp the sphere between said upper and lower parts after the pulley is in place. 12. A motorized conveyor pulley in which an electric motor is mounted inside a cylindrical drum, said drum being mounted for rotation about a substantially fixed axis of rotation on a shaft mounted against rotation, an end of said shaft being mounted in a pivot sphere, said sphere being mounted against rotation around said axis of rotation in a socketed mounting block fixedly mounted on a support structure. ith Platform Leveling System, Ser. No. 60/083,666, filed Apr. 30, 1998 inventor: Stephen D. Sykes and Aircraft Cargo Loader With Platform Leveling System and Large DiameterRollers, Ser. No. 60/083,666, Inventor: Stephen D. Sykes, and are incorporated herein in their entireties. This application claims the benefit of provisional application Ser. No. 60/083,663, filed Apr. 30, 1998.