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1. 发明授权

US4629408A Portable concrete beam harping system 失效
标题翻译：便携式混凝土梁吊钩系统
公开(公告)号：US4629408A
公开(公告)日：1986-12-16
申请号：US773425
申请日：1985-09-06
申请人： Anthony S. Giron , Andrew T. Curd
发明人： Anthony S. Giron , Andrew T. Curd
IPC分类号： B28B23/04 , B28B23/06
CPC分类号： B28B23/043 , B28B23/06 , Y10T29/49874
摘要： A portable system for making harped, reinforced concrete beams includes a series of inverted T-shaped concrete bed sections, with aligned longitudinally extending holes for receiving tensioning cables to hold the sections together, to provide two beds, one on either side of the center wall of the sections, to make the concrete beams. At points near the center of each beam to be formed, arrangements for "harping" or depressing the longitudinally extending tensioning steel strands or cables are provided. The harping arrangements include a lever pivotally mounted on the central wall of the concrete sections to pivot in either direction to alternatively harp beams on either side, with intermediate lever actuated arrangements including a harping fork for engaging the steel strands, and screw threaded arrangements at the outer end of the lever for pulling the lever down toward the outer edge of the concrete bed, thereby depressing and harping the tensioning steel strands which are to be embedded in the concrete beams.
摘要翻译：用于制造竖立的钢筋混凝土梁的便携式系统包括一系列倒置的T形混凝土床部分，具有对准的纵向延伸的孔，用于接收用于将部分保持在一起的张紧电缆，以提供两个床，一个在中心壁的两侧的部分，制成混凝土梁。在要形成的每个梁的中心附近的点处，提供用于“竖起”或者按压纵向拉伸的钢绞线或电缆的布置。牵引装置包括枢转地安装在混凝土部分的中心壁上的杠杆，以便沿任一方向枢转以便在任一侧上竖起梁，中间杠杆致动装置包括用于接合钢绞线的叉形叉，以及螺纹装置杠杆的外端将杠杆向下拉向混凝土床的外边缘，由此压下并收紧要嵌入在混凝土梁中的张紧钢绞线。

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