Lattice structure with domain 0001 not applicable. statement regarding federally sponsored soundproofing

摘要

1466522 Sound-absorbing panels KOMMANDITBOLAGET PEMAC INVENTION AB & CO 24 March 1975 [25 March 1974 11 June 1974] 12251/75 Headings E1B and E1W A sound-absorbing wall or suspended ceiling is made up using units each comprising a latticed wire envelope or frame containing a mass of sound-absorbing material. The mass may be contained within a coating or wrapping e.g. 4 which may be inside or outside the envelope or frame, and may be a glassfibre fabric. In the wall of Fig. 9, posts 7 have pressed-out hooks 10 engaging the units, together with rails 8 having hooks along each edges to engage the units, and clamps 5 of rubber or plastics holding adjacent units together. Transverse feet (6) Fig. 14 (not shown) may alternatively be employed, or the units may be hung from hooks or wooden posts (Fig. 16, not shown). A suspended ceiling may comprise units in vertical (Fig. 20) or horizontal planes (Fig. 22). A supporting frame is shown in Fig. 30, and the frame may be initially open at the top, and designed to rest by making the lower internal angles oblique, the connecting wires 32 being positioned after insertion of the soundabsorbing material.