Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent
1981-07-20
1984-01-24
Stearns, Richard R.
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
33161, G01B 306, G01B 308
Patent
active
044267908
ABSTRACT:
An accessory is adapted to be attached to a foldable ruler to enhance the use of a foldable ruler in measuring the distance between two spaced-apart surfaces or elements. The accessory enhances accurate measurement and facilitates precise reading of such measurements. The accessory comprises a sheath and a bar. The sheath includes a lower channel, an upper passageway positioned above the channel, a window opening into the upper passageway, a hairline index provided adjacent to the window and spaced from one end of the sheath by a distance equal to the distance between the axis of the hinged connection of adjacent ruler sections and a free end of one of the sections which is adjacent to the axis. The bar comprises one portion without indicia and one portion having indicia or graduations thereon. A stud can be provided on the bar to engage a groove within the passageway in order to limit the slidable movement of the bar within the passageway. An adjustable screw can be provided in the lower channel in order to secure a section of the foldable ruler to the accessory.
REFERENCES:
patent: 763523 (1904-06-01), Traut et al.
patent: 893035 (1908-07-01), Turner
patent: 1978887 (1934-10-01), Stowell
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