A novel drafting device and drafting aid; a device comprising removably attachable means for acurately guiding a T-square across any available flat work surface; a removably attachable, size adjustable U-shaped frame providing an elongate straight edge to receive and guide a conventional T-square across and over any conveniently available flat work surface; a T-shaped section beam member and mounting means therefor which are removably adjustably securable to any flat surface, table, wall, window...

This invention relates to new drawing board apparatus and drafting tools. A straight edge member slides within slots along the sides of a drawing board and is held in position selectively by magnets. The slideable member slides along the straight edge. A magnet holds this slideable member in position along the straight edge. A protractor is attached to the slideable member. An arm is rotated on the center of the protractor and held in place by magnets. Scales are provided on the drawing board, s...

Operating levers for controlling the horizontal and vertical movement of a track-type drafting machine are mounted on the vertical motion carriage and are at all times within the functional span of the hand of a draftsman grasping the protractor drafting head. Actuation of the brake assembly carried by the horizontal motion carriage is effected by means of a cord loop extending between the carriages with movement of the operating lever drawing the cord through a dead center point of maximum tens...

A light weight portable straight-edge which incorporates a complete 180.degree. protractor with a vise for individual position stability. The vise is essentially a common heavy gauge spring establishing a pivot that induces a constant pressure at the extremity of the opposing clamp and straight edge that together have a holding tolerance for materials of 1/4" to approximately 21/4".

A drawing board and clipscale combination in which a paper holder and a ruler are united in a single body. The board has a groove and a portion overhanging it along each of the four sides. The clipscale includes a ruler, one side of which is protruded in the middle with a screw hole for receiving a screw. The other side of the ruler is a base side, and on the back is a linear hook-shaped stopper. The stopper is received in the groove of the board, and paper is positioned while the screw is loose...

A portable folding table system especially adapted for support on a bed, which folds for storage and which when open provides aligning, work supporting and work ventilating facilities; a grid on the table surface supplies means for squaring the weave of cloths being worked on the table, rods on opposed edges of the table parallel with lines of the grid provide guides for a snap-on graduated straight edge slidable on the rods to align patterns placed on the cloth being worked with the weave of th...

A cursor assembly for use in association with a viewing window of a microfiche viewer consisting of a first guide rail, a slide member and a reader bar projecting outwardly from the slide member. The slide member has U-shaped slipway extending longitudinally thereof. The slipway is substantially wider than the guide rail whereby the slide member may be located on the guide rail with the guide rail extending longitudinally through the slipway. A permanent magnet is carried by the slide member suc...

A guide clamp is disclosed which includes a clamping jaw at one end of a guide bar. An opposing shifting jaw is slidably carried on the guide bar to permit a workpiece to be embraced by the jaws. The guide bar is a flat, rectangular channel member open at the undersurface which engages the workpiece surface. The jaws, extended below this undersurface engage the opposite sides of the workpiece, such as a board, with the shifting jaw being shiftable and lockable in the channel at a jaw-engaging po...

A drafting table and measurement system which utilizes a read head for measuring the displacement of a straight edge overlying the drafting table. The drafting table mounts two perpendicularly disposed straight edges, one of which moves to and fro along the X-axis of the drafting table and the other which moves in a to-and-fro movement along the Y-axis of the table. Each straight edge is mounted on a carrier block via an adjustable member which can be operated to draw a portion of the straight e...

Apparatus for mathematical-geometric experimentation with variable straight lines, distances, angles, and areas in one plane.