Trimming square set
OwnerHiroto Wakamatsuinventor
Life of this patent
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Abstract
Disclosed herein is a trimming square set suitable for trimming photographic films, drawings or the like into arbitrary rectangular shapes. The square set utilized the rule that the four apices of a rectangle are invariably located on one circumference, permitting to form a rectangle of a desired size in an extremely facilitated manner by means of a first square member rotatably mounted on a base plate, a second square member rotatably mounted on a slide plate which is slidable on the base plate, and a circular hole provided in the base plate. Similar rectangles of different sizes can be formed easily by sliding the slide plate on the base plate.
Claims6
A trimming square set comprising in combination:
- a base plate having a circular opening therein;
- a first square member having inner edges set at right angles to each other and pivotally supported on the base plate by a pin member located at a position proximate to the peripheral edge of the circular opening of said base plate, at a point proximate to an intersecting point of said inner edges;
- a slide plate being slidingly movable on said base plate in a direction parallel with an imaginary line passing through the centers of said pin member and circular opening and provided with a semi-circular notch congruently with the peripheral edge of said circular opening of said base plate;
- and
- a second square member having inner edges set at right angles to each other and pivotally supported on said slide plate by a second pin member located on said imaginary line and in a position proximate to the peripheral edge of said semi-circular notch, at a point proximal to the intersecting point of the inner edges thereof.
Dependencies are inferred from the claim text.