发明名称 Surveying level visualisation device for tunnel alignment
摘要 The device includes a projector (5) placed on a support (9) and held by a clamp (15). The support is placed inside a casing (4) protected against humidity and dust. The casing upper section presents a lid (1), fixed with four screws (14), and provided with an opening (2) which allows placing of a film in a recess (12). The opposite side of the casing presents two windows (2,3) corresponding to the projector output. The lower part of the casing houses the projector power supply (6) and a fan (7). Two lateral handles are provided on the casing exterior surface for transporting it.
申请公布号 FR2738593(A1) 申请公布日期 1997.03.14
申请号 FR19950010789 申请日期 1995.09.11
申请人 SECOND PAUL 发明人
分类号 E21D9/00;G01C15/00;(IPC1-7):E21D9/00;G03B21/00 主分类号 E21D9/00
代理机构 代理人
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