Geometrical instruments – Area integrators – Electrical
Patent
1978-08-25
1979-05-22
Haroian, Harry N.
Geometrical instruments
Area integrators
Electrical
33112, 33 96, B43L 700
Patent
active
041551656
ABSTRACT:
An instrument for marking, in preparation for subsequent cutting, of picture mat stock utilized in producing octagonal single or dual matting of pictures, comprising a base plate having a right angle indentation in one of its margins for accommodating the right angle corner of unmarked mat stock and a rectilinear base margin for accommodating the adjustably positionable transverse member of a conventional framer's T-square, a mid-plate secured to and overlying the base plate having coincident margins therewith but whose right angle indentation is parallel to but spaced from that of the base plate and two top plates secured to the mid plate having inclined margins coincident with the right angle indentation of the base plate, the top plates being laterally truncated to form a channel over said mid-plate to freely receive the shank portion of the framer's T-square.
REFERENCES:
patent: 313197 (1885-03-01), Gaylord
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patent: 778521 (1904-12-01), Wheat
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patent: 3156984 (1964-11-01), Palmer
patent: 3381382 (1968-05-01), Kemp
patent: 3687770 (1972-08-01), Chase
patent: 4027396 (1977-06-01), Pierce
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