Geometrical instruments – Gauge – Internal
Reexamination Certificate
1999-08-06
2001-03-27
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Gauge
Internal
C033S354000, C033S520000, C033S544400
Reexamination Certificate
active
06205670
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of bore centering apparatus, and more particularly to a novel bore centering device which allows straight transfer of centering points that are level or with a particular slope, pitch or grade consideration.
2. Brief Description of the Prior Art
In the past, it has been a difficult and labor intensive procedure to align the center axes of a bore with an intended target, such as a spot on a remote wall. Attempts have been made to locate the central axis of a bore or hole, such as in a wall, by installing a string length allowing the central axis of the bore and terminating the end of the string at the intended target. Other attempts have been made which require the use of optical equipment which is time-consuming and requires the expense of the equipment in order to perform the procedure. It is particularly difficult when it is required that a particular layout direction be quickly obtained and which direction may include a particular degree of offset. A particularly troublesome procedure involves the showing of compound angle layouts or directions of mechanical runs.
Therefore, a long-standing need has existed to provide a bore centering tool which may or may not involve application or sight offset angles in degrees and which provides that centering layout references can be accomplished by simply inserting a centering tool assembly into an open-ended hole and then employing a laser beam for sighting the directional layout desired. The laser provides a relatively inexpensive tool for generating and producing a beam directed to the intended target.
SUMMARY OF THE INVENTION
Accordingly, the above problems and difficulties are avoided by the present invention which provides a novel bore centering apparatus that includes an elongated level having a laser beam generator at one end which is insertably received into the center of a centering cone that is placed within the hole. Adjustment of the level is made via at least one or a pair of turn buckles which adjustably connect the level to the front face of the wall having the hole into which the centering cone is placed. The laser beam generator produces a beam which is extended through the centering cone along its central longitudinal axis and therefore is coincident with the central longitudinal axis of the hole so that the beam terminates at a remote or spaced-apart intended target. Offset lines in degrees are carried on the external surface of the centering cone so that layout directions can be given quickly at a glance. A protractor plate may be incorporated into the assembly at the base of the centering cone in order to set the desired degree of offset. By combining a 45 degree or a 30 degree offset marks on the bore cone, the bore assembly is tilted accordingly to show compound angle layouts or directions of mechanical runs.
Therefore, it is among the primary objects of the present invention to provide a novel bore centering tool which may be used in connection with construction roughends dealing with multiple joists or truss constructions, block wall corning applications or any layout transfer dealing with centering from a successive layout.
Still another object of the present invention is to provide a centering tool wherein the setup time is quick and simple and which allows straight transfer of centering points that are level and with a particular slope, pitch or grade consideration.
A further object of the invention resides in a bore centering tool employing a laser for producing a laser beam which is absolutely straight and will assure easy installation of any piping or mechanical run through the extended transfer of drill or core centers for hundreds of feet.
A further object resides in providing a bore centering tool which may include pre-marked degrees of offset lines on the external surface of a conical center cone and which may employ protractor plate to set the desired degree of offset so that combining the 45 degree or 30 degree offset marks on the bore conical cone and tilting the bore assembly, the compound angle layouts or directions of mechanical runs will be shown.
Still a further object resides in providing an adjustable means for centering a projecting laser beam through a hole which employs turn buckle means interconnecting the laser beam housing with the surface of the wall in which the hole is placed.
REFERENCES:
patent: 2484801 (1949-10-01), Anderson
patent: 2634509 (1953-04-01), Roberts
patent: 2761215 (1956-09-01), Macklanburg
patent: 3407509 (1968-10-01), Martinez
patent: 3755905 (1973-09-01), Blubaugh et al.
patent: 4993160 (1991-02-01), Fraley
patent: 5561911 (1996-10-01), Martin
patent: 5568265 (1996-10-01), Matthews
patent: 5655309 (1997-08-01), Hadrami
patent: 5815937 (1998-10-01), Glorioso, Jr.
patent: 5894675 (1999-04-01), Cericola
Bennett G. Bradley
Marrs Roger A.
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