Plumb bob and cooperating reel
OwnerMichael J. O'Neilinventor
Life of this patent
Estimating the term…
Abstract
A plumb bob having a central body portion and at least three substantially identical webs extending outwardly from the body portion along respective radial axes. The angles separating each successive web must be equal to maintain vertical symmetry, and an even distribution of weight, with respect to a longitudinal axis extending centrally through the body portion. In addition, the webs uniformly and linearly taper in a decreasing manner from the top end to the bottom end of the body portion. This geometry permits a worker standing in vertically aligned position above the plumb bob to be able to clearly see both the bottom end of the plumb bob and the preexisting datum from which alignments are being made.
Claims2
A plumb bob in combination with a reel comprising:
- a) said plumb bob including:
- i) an elongated, central body portion having a top surface, said body portion being symmetric about a longitudinal axis extending centrally therethrough;
- and
- ii) an annularly shaped knobbed portion protruding from said top surface of said body portion and having exterior top and side surfaces, and a pair of diametrically opposed J-shaped grooves formed in said exterior side surface, said longitudinal axis extending centrally through said knobbed portion;
- and
- b) said reel including means for securely housing said knobbed portion therein, said housing means including a plum bob receiving portion integrally attached to said reel, said receiving portion including:
- i) an open cavity defined by top and side walls;
- ii) said side wall having a pair of diametrically opposed apertures formed therethrough;
- iii) means for engaging said J-shaped grooves formed in said knobbed portion;
- and
- iv) a resilient body member having a contiguous sidewall, a longitudinal slit extending through said side wall, a pair of diametrically Opposed spring clips integrally extending from one edge of said side wall, and a pair of diametrically opposed apertures formed through said side wall.
Dependencies are inferred from the claim text.