Geometrical instruments – Straight-line light ray type – Alignment device
Patent
1984-09-18
1986-11-11
Martin, Jr., William D.
Geometrical instruments
Straight-line light ray type
Alignment device
33290, G01B 1126
Patent
active
046214330
ABSTRACT:
A verticality detecting apparatus for plumbing columns has a measuring section to be mounted on a lower end portion of an upper column, an upper target to be mounted on an upper end portion of the upper column and a lower target to be mounted on a lower end portion of a lower column joined to the lower end of the upper column. Inclinations of the measuring section about two orthogonal horizontal axes are adjustable and can be locked at adjusted inclinations. The measuring section consists of a sight telescope with a right angle prism opposed to its objective while placing an edge of the right angle on its optical axis perpendicular thereto, and an inclination sensor for detecting inclinations of the telescope-prism assembly about the two orthogonal horizontal axes. The upper and lower targets are mounted at such positions that the intersection between the edge of the right angle prism and the optical axis of the sight telescope and the upper and lower targets will align on the same straight line when the upper and lower columns are correctly aligned. The inclination sensor issues two zero output signals when the extensions of the optical axis of the sight telescope as reflected by the reflective surfaces of the right angle prism become vertical. These two output signals issued from the inclination sensor are indicated either visually or audibly by means of an indicator electrically coupled to the inclination sensor.
REFERENCES:
patent: 2088539 (1937-07-01), Stokenbury
patent: 2136689 (1938-11-01), Hughes et al.
patent: 2198836 (1940-04-01), Patton
patent: 3382754 (1968-05-01), Luden
patent: 4517749 (1985-05-01), Scotto
Hayashi Masaharu
Koshigoe Katsuki
Ogino Hiroshi
Takeuchi Tetsuya
Kabushiki Kaisha Sokkisha
Martin, Jr. William D.
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