Geometrical instruments – Straight-line light ray type – Level
Reexamination Certificate
1999-01-20
2001-03-20
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Straight-line light ray type
Level
C033S0010HH, C033S286000, C116S209000
Reexamination Certificate
active
06202315
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a survey marker which may be driven into a vertical surface while providing a horizontal reference surface, thereby facilitating EDM (Electronic Distance Measurement) surveying.
Traditional surveying methods employed survey markers placed in horizontal surfaces so that a transit could be set up over the marker. A plumb bob was normally used to center the surveyor on the mark; a dimple in the marker defined the exact center location. More recently, an optical plumb has been used as well as a mechanical plumb.
In more modern surveying, field measurements are obtained using EDM instruments. A typical EDM instrument emits a light beam which reflects from a distant prism (generally mounted on a prism pole) and then back to the EDM. This arrangement replaces the transit and rod of traditional surveying. In particular, if the dimple of a survey marker is located on a horizontal surface, a prism pole may be placed in the dimple and held vertically. Reflecting the beam from the prism on the prism pole serves to define an exact horizontal and vertical location.
However, presently available survey markers may be used with EDM instruments and prism poles only when the marker is placed in a horizontal surface, since only then is the dimple disposed horizontally. Often a location in a horizontal surface is not permanent; for example, if the marker is driven into the earth at a construction site, the location may be destroyed during construction activities. Fixing the marker in the earth is sometimes difficult because the ground is swampy, or covered with water or snow.
Accordingly, it is preferable in many instances to fix the survey marker to a vertical surface. Furthermore, it is desirable that the survey marker be inexpensive, since several markers are permanently left at the site in a typical surveying job.
U.S. Pat. No. 5,062,753 describes a survey nail which may be driven into a vertical surface. This nail includes two spike shanks and an integral benchmark surface which is horizontal when the nail is driven into the vertical surface. This arrangement has a complicated structure which increases its manufacturing cost. In addition, the patent describes a sighting dimple located on an impact surface of the nail. Such a dimple would be on a vertical surface when the nail is driven into a vertical surface, and thus would not be usable with a prism pole.
SUMMARY OF THE INVENTION
The present invention provides an inexpensive surveying spike which includes a horizontal reference surface when the spike is driven into a vertical surface.
According to the present invention, a surveying spike having a longitudinal axis is provided with a single nail portion and an end portion; the end portion is attached to the nail portion and is coaxial therewith. The end portion has a body portion and a reference surface projecting radially from the body portion. The reference surface is disposed parallel to the axis of the end portion and has a dimple formed therein.
According to another aspect of the invention, the nail portion is formed of a metallic material and the end portion is formed of a plastic material.
According to a further aspect of the invention, a casing is provided for a conventional nail; the nail is inserted along an axis of the casing, thereby forming a surveying spike. The casing has a body portion and a reference surface projecting radially therefrom. Again the reference surface is parallel to the axis of the casing, and has a dimple formed therein. The casing may be formed of a plastic material to minimize cost.
Furthermore, the present invention provides a method of manufacturing a surveying spike. The method includes the steps of providing one metal nail; providing a plastic member having a longitudinal axis and having a body portion and a reference surface projecting radially from the body portion with respect to the axis, the reference surface being disposed parallel to the axis and having a dimple formed therein; and inserting the nail into the plastic member along the longitudinal axis. Additionally, an identification tag is provided having information thereon such as distance, and elevation. The tag has a hole punched therein to receive the nail, so that the tag hangs from the surveying spike and is held in place by the plastic member.
REFERENCES:
patent: D. 234098 (1975-01-01), Coumbs
patent: 928477 (1909-07-01), Sloggett
patent: 2096638 (1937-10-01), Higgins
patent: 2762128 (1956-11-01), Whelan
patent: 2904890 (1959-09-01), Vajda
patent: 3475101 (1969-10-01), Jeffery, Sr.
patent: 3781079 (1973-12-01), Hug et al.
patent: 3890717 (1975-06-01), Haun
patent: 5062753 (1991-11-01), Begue
patent: 5247900 (1993-09-01), Sobczak
patent: 5568785 (1996-10-01), Hazen
patent: 5943784 (1999-08-01), Hiramine
patent: 5946877 (1999-09-01), Gallinat et al.
patent: 6044567 (2000-04-01), Feist
patent: 908391 (1972-08-01), None
patent: 93/19447 (1993-09-01), None
BenchTie L.L.C.
Fitzpatrick ,Cella, Harper & Scinto
Francis Faye
Gutierrez Diego
LandOfFree
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