公开(公告)号：US07712515B2

公开(公告)日：2010-05-11

申请号：US11279132

申请日：2006-04-10

申请人： Leon P. Sulak ,  Brian J. Rachwitz ,  Keith A. Gee ,  Paul F. Harm ,  Jeremy I. Johnson

发明人： Leon P. Sulak ,  Brian J. Rachwitz ,  Keith A. Gee ,  Paul F. Harm ,  Jeremy I. Johnson

IPC分类号： B22C7/00

CPC分类号： E02D29/1427

摘要： A municipal casting frame is provided with cast nut retainers that allow the frame to be used with or without a bolt-down cover. The frame defines one or more bolt holes of sufficient dimension to allow free passage of the cover bolts. The undersurface of the frame defines a cast nut retainer adapted to securely receive a nut. In one embodiment, the nut retainer includes protrusions that permit the nut to be snap-fitted into the nut retainer. In another embodiment, the nut retainer is configured to frictionally receive the nut in a wedging interaction. The present invention also provides a method for manufacturing a frame with integral cast nut retainers. The method generally includes the steps of (a) providing a core corresponding in shape to the bolt hole and the cast nut retainer, the cast nut retainer being configured to receive and retain a nut, (b) casting a frame in a mold about the core, (c) removing the cast frame from the mold and (d) removing the core from the cast frame. The process may also include the step of inserting a nut into the cast nut retainer in a direction that is in substantial coaxial alignment with the bolt hole.

摘要翻译： 市政铸造框架设置有铸造螺母保持器，其允许框架与或不具有螺栓下盖。 框架限定一个或多个足够尺寸的螺栓孔，以允许盖螺栓自由通过。 框架的下表面限定了适于牢固地接收螺母的铸造螺母保持器。 在一个实施例中，螺母保持器包括允许螺母卡扣配合到螺母保持器中的突起。 在另一个实施例中，螺母保持器构造成以楔形相互作用摩擦地接收螺母。 本发明还提供了一种用于制造具有整体式铸造螺母保持器的框架的方法。 该方法通常包括以下步骤：（a）提供与螺栓孔和铸造螺母保持器相对应的形状的芯，铸造螺母保持器构造成容纳和保持螺母，（b）将框架围绕模具 芯，（c）从模具中移除铸造框架，（d）将芯从铸造框架上取下。 该方法还可以包括将螺母沿着与螺栓孔基本同轴对准的方向插入铸造螺母保持器中的步骤。