| 摘要 |
A panel intended for use as a vacuum enclosure, comprising a pair of spaced sheets defining between them opposite walls of the enclosure, and a spacer assembly located between the sheets and adapted to maintain the sheets at the desired spacing, said spacer assembly comprising a pair of bearing pads positioned on the inside surfaces of the sheets at mutually opposite locations, a spacer element received between the bearing pads which spacer element is formed with substantially spherical bearing surfaces cooperating with the bearing pads, and spring means incorporated within the spacer assembly adapted to allow a limited degree of relative movement of the sheets in a direction substantially at right angles to the plane of the sheets. |
