Title:
【発明の名称】自動水平垂直装置
Document Type and Number:
Japanese Patent JPH09502024
Kind Code:
A
Abstract:
An automatic plumb, level and pointing tool uses a visible laser diode to project light beams in two modes through two windows. In the first mode of operation, the unit is able to project a plumb-up beam and a level beam of light while resting on a surface which is as much as five degrees out of level. In the second mode of operation the unit is able to project two orthogonal beams of light both approximately in the horizontal plane for aligning one or more reference lines. An accurate, low cost method of generating level and plumb beams and planes of light is disclosed. One method uses an approximately leveled platform combined with a weak optical correction. The approximate leveling is done using a single wire or coil spring pendulum element which allows the platform to level itself to within a small fraction of true level, and remaining correction is provided by a weak negative lens or a weak reverse telescope. In alternative embodiments, all leveling is accomplished using a very flexible coil spring as a pendulum element, or a chain link connection in combination with such a spring. Several accessories are disclosed for use with the laser tool.
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Inventors:
Rand, Joseph
Rittenberg, Christian
Rittenberg, Christian
Application Number:
JP50759295A
Publication Date:
February 25, 1997
Filing Date:
August 02, 1994
Export Citation:
Assignee:
Levelite Technology Inc.
International Classes:
G01C5/02; G01B11/26; G01C15/00; G01C15/10; (IPC1-7): G01C15/00; G01B11/26; G01C5/02
Attorney, Agent or Firm:
Keinosuke Ozawa (1 person outside)