초록 ▼

Hollow spheres with precisely concentric inner and outer spherical surfaces are formed by applying vibrations to a nonconcentric hollow sphere while it is at an elevated temperature at which it is fluid or plastic, the vibrations producing internal flows which cause the inner and outer surfaces to b

Hollow spheres with precisely concentric inner and outer spherical surfaces are formed by applying vibrations to a nonconcentric hollow sphere while it is at an elevated temperature at which it is fluid or plastic, the vibrations producing internal flows which cause the inner and outer surfaces to become precisely concentric. Concentric spheres can be mass produced by extruding a material such as glass or metal while injecting a stream of gas into the center of the extrusion to form a gas-filled tube. Vibrations are applied to the extruded tube to help break it up into individual bodies of a desired uniform size, the bodies tending to form spherical inner and outer surfaces by reason of surface tension, and the continuing application of vibrations causing these surfaces to become concentric.

대표청구항 ▼

A method for forming a hollow shell with concentric inner and outer surfaces, comprising: applying acoustic vibrations through a gaseous medium to a detached hollow body which lies in the gaseous medium free of contact with a solid, and which is at a temperature at which the material of the walls of

A method for forming a hollow shell with concentric inner and outer surfaces, comprising: applying acoustic vibrations through a gaseous medium to a detached hollow body which lies in the gaseous medium free of contact with a solid, and which is at a temperature at which the material of the walls of the body can flow to provide said concentric inner and outer spherical surfaces.