Geometrical instruments – Distance measuring – By flexible tape
Patent
1990-12-18
1992-05-19
Haroian, Harry N.
Geometrical instruments
Distance measuring
By flexible tape
33760, 33340, G01B 502
Patent
active
051135957
ABSTRACT:
The invention provides a method and a device for positioning a dart board and an associated throwing line (hockey) without reference to the slope of the floor or the verticality of the wall (on which the board is mounted), or on the planarity of either. The primary advantage of the device is that inaccuracies in the level of the floor and the angle between the floor and the wall do not effect the measurement; another advantage is that the device allows the positioning to be done by a single person. The device includes two measuring lines connected (virtually) at right angles with means for leveling the throwing distance line, means for measuring the board elevation, means for attaching to the board and/or a board mounting bracket, and means for locating the hockey.
REFERENCES:
patent: 918869 (1909-04-01), Larsen
patent: 1166019 (1915-12-01), Taylor et al.
patent: 1323018 (1919-11-01), Craddock
patent: 1369652 (1921-02-01), Hall
patent: 2536447 (1951-01-01), Kirton
patent: 3568322 (1971-03-01), Showers
patent: 4274203 (1981-06-01), Vasile
Ad for "Briefcase Dartboard," Double Eagle Newsletter, American Darts Organization (Bellflower, Calif.), vol. 13, No. 4 (Fall '89).
Haroian Harry N.
Ruben Bradley N.
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