Optics: measuring and testing – Fiducial instruments
Reexamination Certificate
1999-08-13
2001-04-24
Font, Frank G. (Department: 2877)
Optics: measuring and testing
Fiducial instruments
C033S534000
Reexamination Certificate
active
06222625
ABSTRACT:
CROSS REFERENCES TO RELATED APPLICATION
None.
BACKGROUND OF THE INVENTION
a. Field of the Invention
The invention relates to devices which make measurements and measure angles for construction. In particular, the invention relates to devices which use a laser beam mounted onto a string line to aid in construction layouts.
b. Description of the Prior Art
The prior art contains multiple devices which use a laser beam to aid in construction layouts. Many of these devices are used as levels which project a laser beam in a horizontal plane. U.S. Pat. No. 4,221,483 to Rando uses a complex level system to emit a horizontal laser which is detected by an electronic detector. Many of these devices are confined to mounting on a tripod or other platforms. Other devices emit laser beams perpendicular to a given plane. U.S. Pat. No. 5,594,993 to Tager emits such a beam from a hand held device and can substitute for a string line.
The limitations of a required detector, a fixed height platform, and a perpendicular emitted laser beam make it desirable to have an invention which overcomes these limitations.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide an apparatus which does not require a detector, can be used at any desired height, and can designate angles for laying out and marking a construction site. The present invention accomplishes this objective by providing hangers and a brace to support a laser unit from a string line fixed between two reference points, using a cooperating compass plate and compass pointer so that an angle relative to the line formed by the string can be selected for the emitted laser.
There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject matter of the claims appended hereto.
In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in this application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting. As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. Additional benefits and advantages of the present invention will become apparent in those skilled in the art to which the present invention relates from the subsequent description of the preferred embodiment and the appended claims, taken in conjunction with the accompanying drawings. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
Further, the purpose of the foregoing abstract is to enable the U.S. Patent and Trademark Office and the public generally, and especially the scientist, engineers and practitioners in the art who are not familiar with patent or legal terms or phraseology, to determine quickly from a cursory inspection the nature and essence of the technical disclosure of the application. The abstract is neither intended to define the invention of the application which is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.
REFERENCES:
patent: 4221483 (1980-09-01), Rando
patent: 4993161 (1991-02-01), Borkovitz
patent: 5108177 (1992-04-01), Middleton
patent: 5561911 (1996-10-01), Martin
patent: 5572796 (1996-11-01), Breda
patent: 5594993 (1997-01-01), Tager et al.
patent: 5636018 (1997-06-01), Hirano et al.
patent: 5754582 (1998-05-01), Dong
patent: 5784155 (1998-07-01), Ohtomo et al.
patent: 5859693 (1999-01-01), Dune et al.
Font Frank G.
Stafira Michael P.
White Edward L.
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