| 摘要 |
A lintel of a "top hat" type made from a single metal member having an outer flange (11), an upright outer face elements (16), a steeply upwardly inclined cavity element (18), an upright inner face element (17), and an inner flange (13), the lintel having a foam (20) such as a self-skinning polyurethane foam formed within its interior. The foam (20) is contiguous with the flanges (11 and 13) at the downwardly facing opening of the space (19) so as to form a key for direct application of mortar or plaster in use. Keying formations may be moulded onto the foam or its skin may be scored or cut off to reveal open cell structure and assist keying. <IMAGE> |
