The target and upper fixture may be connected by a telescoping column, if desired. Apparatus providing for use of the plumb bob by a single person is also disclosed, comprising an upper fixture from which the plumb bob is suspended, an extension arm, and a target. With the use of a laser to provide a plumb line of coherent light which beam does not spread, the plumb bob may be suspended from a relatively short line in order to dampen oscillations more quickly. The laser device is affixed within the plumb bob body to preclude relative movement therebetween, to ensure accuracy for the device.
Y10- TECHNICAL SUBJECTS COVERED BY FORMER USPC.Y- GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS AND DIGESTS.G01C15/00- Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00.G01C- MEASURING DISTANCES, LEVELS OR BEARINGS SURVEYING NAVIGATION GYROSCOPIC INSTRUMENTS PHOTOGRAMMETRY OR VIDEOGRAMMETRY.238000009792 diffusion process Methods 0.000 description 2.238000009435 building construction Methods 0.000 abstract description 4.230000001427 coherent Effects 0.000 abstract description 8.
230000000875 corresponding Effects 0.000 claims description 10.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Rooney Michael filed Critical Rooney Michael Priority to US08/348,256 priority Critical patent/US5481809A/en Priority to PCT/US1996/000484 priority patent/WO1997025591A1/en Application granted granted Critical Publication of US5481809A publication Critical patent/US5481809A/en Anticipated expiration legal-status Critical Status Expired - Fee Related legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US08/348,256 Inventor Michael Rooney Original Assignee Rooney Michael Priority date (The priority date is an assumption and is not a legal conclusion.
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Google Patents Laser plumb bob and apparatusĭownload PDF Info Publication number US5481809A US5481809A US08/348,256 US34825694A US5481809A US 5481809 A US5481809 A US 5481809A US 34825694 A US34825694 A US 34825694A US 5481809 A US5481809 A US 5481809A Authority US United States Prior art keywords plumb bob plumb laser line target Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US5481809A - Laser plumb bob and apparatus US5481809A - Laser plumb bob and apparatus
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