Method for cold-forming plastic sheet
    7.
    发明授权
    Method for cold-forming plastic sheet 失效
    冷成型塑料片的方法

    公开(公告)号:US4071598A

    公开(公告)日:1978-01-31

    申请号:US771407

    申请日:1977-02-23

    摘要: A method of cold-forming a thermoplastic sheet to provide a circular container part such as a lid or dish comprising the steps of engaging a sheet of thermoplastic material between opposing concentric die members, drawing the sheet around the circular edge of one of the die members to provide a concentric central portion and a concentric annular depending skirt having a proximal edge adjacent the central portion, an intermediate portion, and a distal free edge, provide an annular void in the die members adjacent the skirt, then moving the free edge toward the proximal edge while holding the proximal edge to buckle the said intermediate portion into the void. In the apparatus, the void has a tapered surface inclining radially outwardly and axially toward the proximal edge to hold the free edge radially inwardly, thereby to permit the intermediate portion to buckle outwardly into the void.

    摘要翻译: 一种冷成型热塑性片材以提供诸如盖子或盘子的圆形容器部分的方法,包括以下步骤:将热塑性材料片接合在相对的同心模具构件之间,将片材围绕其中一个模具构件的圆形边缘 以提供同心的中心部分和具有邻近中心部分的近端边缘的中心部分和同心环形的裙部,中间部分和远端自由边缘在模具构件中邻近裙部提供环形空隙,然后将自由边缘朝向 近侧边缘,同时保持近侧边缘将所述中间部分扣合到空隙中。 在该装置中,空隙具有朝向近侧边缘径向向外且轴向倾斜的锥形表面,以将自由边沿径向向内保持,从而允许中间部分向外弯曲到空隙中。

    Luminous ceiling panel
    10.
    发明授权
    Luminous ceiling panel 失效
    发光天花板

    公开(公告)号:US2996417A

    公开(公告)日:1961-08-15

    申请号:US3331860

    申请日:1960-06-01

    摘要: 914,868. Light transmitting panels. WILSON, B. A. June 1, 1961 [June 1, 1960], No. 19823/61. Addition to 872,410. Class 75 (4). [Also in Groups VIII and X] A light-transmitting ceiling panel comprises upper and lower dimpled sheets 1, 3 of light transmitting plastic united for example by heat sealing, at the bottoms 11 of the dimples to opposite faces of an intermediate sheet 2 of light transmitting plastic, the dimples of the upper sheet 1 being located opposite the dimples of the lower sheet 2, and the side walls 13 and bottoms 11 of the dimples being thinner than the remaining parts of the dimpled sheets. The sheets 1, 3 are of flanged dished form with the dimples formed in the bottom wall 9 of the dished portion, the flanges 4 being united to opposite sides of the margin of the intermediate sheet 2. The flanges 4 may be dispensed with. Holes 12 may be formed through the bottoms of the dimples and the intermediate sheet 2 within the areas where the bottoms of the dimples are united to the intermediate sheet. The sheets may be formed of polyvinylchloride.