| 摘要 |
PROBLEM TO BE SOLVED: To provide a survey height-regulatable spacer capable of reducing cost and capable of obtaining an effect of safety countermeasure. SOLUTION: In this survey height-regulatable spacer, a point shaft attaching bolt is attached to a spacer main body, and a point shaft with a cavity in its inside is inserted thereinto. Safety for a worker is kept with easy breakage, by using the spacer, even when beginning to turn over caught by it, and working is not required in a field. The attaching bolt has a thread ridge to regulate finely a height by inserting a nut in a bottom part. A gage is engraved in the shaft for surveying the height to be cut easily in response to the field. The spacer of the present invention is used also for an existing spacer by using a detachable type bolt. COPYRIGHT: (C)2007,JPO&INPIT
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