Three dimension target
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United States of America Patent
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Jul 9, 1985
Grant Date -
N/A
app pub date -
Feb 21, 1984
filing date -
Feb 21, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A three dimension optical transit target for use in optical tooling, when a construction site of interest is not within view of optical transits, comprises a rod having a target head on one end and an engagement area on another end for contact with the construction site. The target head includes at least one target, preferably defined by cross-hairs, located on a line passing through a rotational axis of the rod and the construction site of interest when the three dimension target is in use. When the three dimension target is supported such that the cross-hairs are visible from a sufficient number of optical transits, the location of the construction site in relation to the transits may be determined if the distance between the cross-hairs and the construction site is known. Several embodiments are described; in one a single set of cross-hairs is used in a target head which, in use, is supported with the cross-hairs positioned on a vertical line passing through the site. In another, two sets of cross-hairs are provided in the target head. In this embodiment, the rod need not be supported vertically above the site. In third and fourth embodiments, alternatives to cross-hairs are described.
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