Geometrical instruments – Area integrators – Electrical
Patent
1986-04-16
1987-07-14
Martin, Jr., William D.
Geometrical instruments
Area integrators
Electrical
33493, 33494, G01B 310
Patent
active
046793259
ABSTRACT:
An improved chalk line marking device for placing chalk marks at regularly spaced intervals along a straight line on a workpiece includes a composite tape having a central layer of porous material receptive to chalk. Upper and lower layers overlying the first layer have smooth surfaces substantially non-receptive to chalk. Holes are formed in the upper and lower layers at regularly spaced intervals through which the underlying portions of the central chalk-receptive layer are exposed. The composite tape is normally stored in a housing and is extensible through an aperture in the housing. The tape is chalked as it is withdrawn through the aperture, the chalk being received by the portions of the central layer exposed through the holes in the upper and lower layers, but the chalk is not absorbed by the smooth upper and lower layers. When the tape is stretched along the desired line and snapped against the workpiece, chalk is transferred from the portions of the central chalk-receptive layer exposed through the holes in the smooth outer layers onto the workpiece to provide chalk marks on the workpiece at regularly spaced intervals.
REFERENCES:
patent: 1145244 (1915-07-01), Hoffmann
patent: 2602233 (1950-07-01), Irving
patent: 3136067 (1964-06-01), Horner
patent: 3451880 (1969-06-01), Kay
patent: 4152836 (1979-05-01), Rodrique
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