作者: Fristot A
DOI:
关键词: Integrally closed 、 Mortise and tenon 、 Rod 、 Structural engineering 、 Geology
摘要: In this artificial tree the central bole comprises substantially rectangular openings off-set both laterally and vertically each branch is adapted to engage a corresponding opening by means of tenon formed integrally therewith being force-fitted therethrough. To eand, projecting lips or catches undergo an elastic deformation when said introduced through opening, subsequently retained in their inclined position engaging with heel inner surface tubular hole. Internal cam may be provided for actuating thus fold branches inoperative alongside bole. These cams carried common rod.