Geometrical instruments – Area integrators – Electrical
Patent
1977-02-09
1978-10-24
Phillips, Charles E.
Geometrical instruments
Area integrators
Electrical
33 95, B43L 1324
Patent
active
041213440
ABSTRACT:
A universal drafting triangle comprising a lower or first triangle laminate having a surface groove spaced from and along its three sides with rollers adjacent to angles of the triangle and connecting with the groove and a drive wheel adjacent to the remaining angle of the triangle and connecting with the groove. A belt drive such as an "O" ring is disposed within the groove and wrapped around the rollers and wheel. A raised track is disposed on the triangle laminate adjacent to one side of the triangle and spaced from the groove along that side. A slide member is adapted for sliding along the track and has an indentation for entrapping a portion of the "O" ring riding inside the groove adjacent to the track. The sliding member is in turn connected to a second solid triangle which is adapted for sliding along the adjacent side of the triangle laminate. The two rollers and wheel are disposed in indentations communicating with the grooves. A third triangle laminate is disposed over the first triangle laminate to enclose the rollers, drive wheel, "O" ring and slide.
REFERENCES:
patent: 496825 (1893-05-01), Gillet
patent: 1213664 (1917-01-01), McCuaig et al.
patent: 1505873 (1924-08-01), D'erams
patent: 2805479 (1957-09-01), Droste
patent: 2893126 (1959-07-01), Coallier
patent: 3762055 (1973-10-01), Citrin
Michalos Constantine A.
Phillips Charles E.
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