| 摘要 |
An access panel for use in conjunction with a horizontal opening; recesses (41, 42) incorporated in the sides of longitudinal edges of the horizontal opening the access panel (11) comprising a parallel array (12) of members (14, 15, 16) with a longitudinal axis; the lateral extent (W) of the array (12) corresponding to a lateral extent (D) of the opening and first (17) and second (18) end members of the array (12) defining a length (L) of the panel (12) characterised by at least two pantograph units (20, 21) extending between the first (17) and second (18) end members; each member (14 - 16, etc) in the parallel array (12) being pivotably linked to each pantograph unit; the combination of members (14, 15, 16 etc) and units (20, 21) providing for the panel (11) to function as a planar structure and enabling the (L) of the panel (11) to be varied between a first configuration wherein the panel has a minimum length (Ll) measured between the first (17) and second (18) end members; a second configuration wherein the panel has a maximum length (L2) measured between the first (17) and second (18) end members or an intermediate configuration having a length intermediate the minimum length (Ll) and the maximum length (L2). |
