摘要:
The present invention relates generally to production of thermoplastic materials which swell in water to produce hydrogels. These materials will hereafter be referred to as “thermoplastic hydrogels”. They are useful as contact lenses or for use in vision correction prosthetics or as cosmetic devices. In particular, the invention relates to thermoplastic hydrogels which show improved flow characteristics.
摘要:
The invention involves an attachable orthodontic hook system for the attachment of an orthodontic hook to a vacuum formed orthodontic appliance, the hook designed for the reception of orthodontic elastics used to correct the patient's bite.
摘要:
A flying vehicle assembly apparatus comprises a winged flying craft and a powered craft comprising two or more hulls for propelling the flying craft, and a biased tether assembly comprising one or more first rigid struts having a first end pivotally secured to pivot connections adjacent to the flying craft and a second end pivotally secured to a hinge assembly, and one or more second rigid struts having a first end pivotally secured adjacent to the powered craft and a second end pivotally secured to a biased hinge assembly. The biased tether assembly urges the flying craft and the powered crafts toward one another whereby at least a portion of said powered craft is beneath the flying craft, and whereby during flying operation, the powered craft is generally forward of the flying craft.
摘要:
A method and apparatus for the manufacture of a composite component by locating a composite lay-up between a mould surface and a backing surface, each surface forming a wall of a respective pressure chamber. Securing the chambers together to retain the lay-up therebetween with at least one of the said walls movable relative to the other, under the influence of pressure in the chamber incorporating the movable wall, to sandwich the composite therebetween. Then circulating fluid under pressure through each of the chambers at substantially the same pressure to compress the composite lay-up between said mould and backup surfaces to compact the composite lay-up. While the fluid is circulating elevating the temperature thereof to effect curing of the composite. One of the walls between which the composite lay-up is located is of a flexible or semi-rigid construction and the opposing surface of the other wall is shaped to impart to the composite the required surface contour in the product.