Geometrical instruments – Scriber – Parallel line
Patent
1975-08-18
1977-02-22
Phillips, Charles E.
Geometrical instruments
Scriber
Parallel line
33 41D, B43L 1302
Patent
active
040085228
ABSTRACT:
Disclosed is a novel ruler apparatus useful for the rapid and precise marking of a plurality of parallel horizontal lines on a classroom blackboard or the like. This ruler, or line tool to which it is sometimes referred, includes, among other elements, an adjustable staff member which is slidably mounted in a vertical support frame; and this vertical support frame is in turn securily affixed to one end of a horizontal slide member. This horizontal slide member and the vertical staff member are further secured, one to another, by means of a handle which is affixed at one end to the top of the staff member and affixed at its other end to the other end of the slide member. The staff member includes a plurality of precisely spaced passages therein adapted to receive a marking member, such as a felt-tip pen. Once the felt-tip pen or other suitable marking member is inserted into a passage, a straight horizontal line may be rapidly drawn on a chalkboard or the like by sliding the horizontal slide member across a chalkboard chalk tray. During this movement, the pen is urged gently against the chalkboard as a result of the staff member leaning slightly against the chalkboard.
REFERENCES:
patent: 561585 (1896-06-01), Harris
patent: 844243 (1907-02-01), Breul
patent: 858254 (1907-06-01), Benedict
patent: 1841972 (1932-01-01), Mosley
patent: 2861343 (1958-11-01), Click
Bethurum William J.
Phillips Charles E.
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