Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1992-01-13
1992-11-17
Will, Thomas B.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33276, 33393, 33414, G01C 1510
Patent
active
051632306
ABSTRACT:
A chalk line assembly includes a housing formed with a cavity therewith to receive powdered chalk, with a chalk line wound within the housing about a central spool. A crank handle is directed into the housing to effect winding and reeling of a chalk line relative to the housing about the spool. A mounting plate is secured to a rear wall of the housing, with the mounting plate including a ferromagnetic member mounted to the mounting plate projecting rearwardly of the mounting plate. The mounting plate further includes a support aperture directed therethrough to receive fasteners permitting vertical mounting of the apparatus to ferrous and non-ferrous supports in directing a vertical chalk line. A modification of the invention includes a fiber optic housing structure mounted to the housing for projecting illumination and alignment with the chalk line and orthogonally oriented relative to the chalk line for measurement in a construction environment.
REFERENCES:
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patent: 1784064 (1930-12-01), Griswold
patent: 1876473 (1932-09-01), Spaeth et al.
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patent: 3568322 (1971-03-01), Showers
patent: 3766659 (1973-10-01), Quenot
patent: 4459761 (1984-07-01), Bosco
patent: 4565011 (1986-01-01), Karger
patent: 4660291 (1987-04-01), Dehn
patent: 4697349 (1987-10-01), Lee
patent: 4773162 (1988-09-01), Lin
Gilden Leon
Will Thomas B.
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