| 摘要 |
The present invention comprises a measuring/positioning device. The invention herein is particularly designed for determining the elevation above a reference floor surface of an overhead object, such as pipe, conduit, duct work, structural steel and the like, the elevation of the center line of tubular objects, and the plumb position on the reference floor surface above which the center line of a tubular object lies. The present invention includes a sensing head that is pivotally secured to one end of an elongate measuring rod. The measuring rod has a measuring scale thereon and is slideably and telescopically engaged within a rigid elongate rectangular housing. The housing includes means for releasable securing the measuring rod at various positions there along, and includes read out points positioned thereon. A pair of level indicators are secured to the housing so that the measuring rod and housing can be positioned to extend through a true vertical line. The read out points are positioned along the housing and the measuring scale is arranged so that the readout means, the measuring scale and the sensing head cooperate to provide measurements of the distance relationship between the object and the reference surface when the object is in contact with the sensing head.
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