| 摘要 |
A plane table for topography survey is provided to improve use convenience and transportation efficiency by allowing length adjustment of the plane table and having structure with an assembled type. A plane table(100) for topography survey comprises central plane tables(10,10'), side plane tables, a first coupling instrument(30), a second coupling instrument(40), a leg member(50), a cap(60) and a paper receiving box(70). The central plane table mounts a length adjusting plate(20) on the upper surface of a rectangular connecting portion(12). The side plane tables have a rectangular groove portion(14) inserted with the rectangular connecting portion of the central plane table, and a steel rod hole(15) bored at one side. The first coupling instrument is connected with an embedding nut(17) of the central plane table. The second coupling instrument connects a protruded rod portion(42) formed in an upper central surface of a plane table portion(41) to the first coupling instrument and is provided with a circular penetrated hole(72) at both sides in the longitudinal direction. The leg member includes a circular rod(51), a rubber connecting material(55) inserted to the circular rod, and a plurality of reinforcing rods(52) connected to the rubber connecting material. The cap is covered on the outside surface of the side plane tables. The paper receiving box has a loading box(71) for storing papers, and is linked to screws(67) in both sides of the steel rod.
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