Set square

Abstract: A universal parallel ruler device has a head supported shiftably with its fixed posture being maintained in a desired direction along the surface of a drafting board, a straightedge mounted swivelably in a plane parallel to the surface of the drafting board, an A-D converter for converting the angular position of the straightedge relative to the base line set to any given digital amount, a detector for detecting polarity of the straightedge relative to the base line, ie whether the straightedge relative is inclined to the clockwise rotation side of the base line or is inclined to the counterclockwise rotation side, and a display device for displaying the digital angular position of the straightedge and the polarity relative to the base line on the basis of the signal from the A-D converter

Abstract: An instrument for altering patterns and making garment changes comprises a transparent ruler having on one side of straightedge and on the opposite side a curved edge one section of which constitutes a hip curve of long radius of curvature and a second section of which constitutes an armhole curve of shorter radius of curvature which curves over beyond a projection of the straightedge and then back to one extremity of the straightedge to provide a shape resembling the letter J. There are calibrated scales on both the straight and curved edges, a series of scaled lines parallel to the straightedge and also an elongate slot parallel to the straightedge.

Abstract: A square for plotting angles, parallels, and polygonal shapes on the circular surface of a cylindrical body. The square includes a pair of contact arms forming a right angle, and a center arm forming a bisector of the right angle. A protractor frame is slidably attached to the center arm, and a pointer is attached to the arc-shaped portion of the protractor. The square includes a separate attached straightedge parallel to the center arm, and movable in variable spaced relation thereto.

Abstract: PROBLEM TO BE SOLVED: To provide a linear scale ruler to which a bevel protractor is integrally attached to facilitate easy drawing of angled lines and which has the same portability as the linear scale ruler, thus, the ruler overcomes the inconvenience to carry such as a set square, a protractor and a gradient ruler which are needed to draw angled lines without using a drafting machine. SOLUTION: The ruler has, at the center portion of its body, a 180-degree-rotation-free bevel protractor with angle scales affixed and with a rotary head which can easily draw any arbitrary angled lines, and it stores the bevel protractor in the storage space prepared in its body so as to contain the bevel protractor, and it functions as the linear ruler having scales affixed on the edge of one side of the linear ruler body. COPYRIGHT: (C)2011,JPO&INPIT