Sola International, Inc.

Other

Michael J Tuhtan

Jeffrey M Kingsbury

Robert H Juul

Ray Steven Spratt

Simon John Edwards

Michael Alan Morris

Colin Maurice Perrott

James E Everett

Martin D Rolph

Martin P Rolph

Disclosed are novel molding methods for injection molding thermoplastic lens elements and particularly adapted for the manufacture of steeply curved and/or thin-centered lenses.

Process for molding thermoplastic lenses and, steeply curved and/or thin lenses produced thereby

Disclosed are novel molding methods for manufacturing thin thermoplastic lenses and, in particular, minus ophthalmic lenses that have thickness of about 1 mm or less at the thinnest point thereof. The molding methods disclosed provide for lenses which lack any abrasion or polishing artifacts on the surface and also lack any negative fining marks below the nominal surface.

Molding method for manufacturing thin thermoplastic lenses

A collapsible table, especially suited for supporting persons to be massaged, comprises, in a main embodiment, a pair of hingedly-connected top sections (12) and two pairs of legs (16) hingedly connected to the respective outer ends of the top sections. A foldable leg brace (18) is connected between the side of the table's top at its center and a lower part of each leg. A brace crosspiece (32) interconnects each pair of braces. A pair of short cable support legs (26) extend down from the center of the table. Each of a pair of cables (28) extends in a V-shaped arrangement from near the leg hinges at one end of the table down through holes in the brace crosspieces to the bottom ends of the cable support legs and then up through the other brace cross piece to the leg hinges at the opposite end of the table. Each cable has a stop (10) fixedly attached thereto just above the place where the cable passes through its brace crosspiece, the stop preferably comprising a sleeve (34) crimped to the cable and a helical spring (38) between the crimped sleeve and the crosspiece. The cable stops prevent the leg braces from being folded up unless the cables are first slackened by folding the two top sections of the table together. However since the top sections can't be folded together while the table is upright, especially if weight is on the table, the table's braces and legs are locked when it is upright. In other embodiment, the cable extends directly between leg braces (FIG. 2), legs per se (FIG. 3), or around splayed legs (FIG. 4) to provide an automatic leg, or leg brace, locking feature. In still other embodiments an improved face cradle (FIG. 5A) is provided which comprises a plate (82), one end of which has a hinged connection (90, 98) to the table top, and which includes a support arm (92) hingedly connected (94) to an underside of the plate and adjustably connected (106) to an underside of the table, either by a slot (96) or by a plurality of holes (128, FIG. 7 C). The table can have an adjustable leg (FIG. 6A) comprising two sections (110, 112) which are keyed together (114) and which are separated by spaced pads (116) and bolted together between the pads (122). The legs (FIG. 8A, 144) can alternatively be hinged to the underside of the table's top (142) and supported in open position by a pair of hinged brace arms (146), the ends of which are removably joinable to the the legs, respectively, at locations spaced from the ends of the legs by pin-in-hole (156, 160) and multiple hook and loop fasteners (154, 158).

Collapsible table with foldable leg braces held straight by cables when

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Sebastopol, CA, United States of America

Michael J Tuhtan