Patent GB-1035561-A (GB)
Title: Drawing apparatus
Inventor: ROUTSCHEK HELMUT
IPC: B43L13/14
Filed: 1964-01-27
Abstract: 1,035,561. Mathematical drawing-appliances. BERGAKADEMIE FREIBERG. Jan. 27, 1964, No. 3421/64. Heading B6P. A mathematical drawing appliance comprises at least four bars of circular cross-section, a first roller carriage 1, Figs. la, 3a, 4a, 5a (not shown), slidably mounted on one of said bars I and carrying a second bar II perpendicular to the bar I, a drawing stylus Z, a linefollowing member F, and a roller joint slide 3 which consists of sleeves rotatable on each other but securable at right-angles. The appliances can be used to produce perspective representations, scale changes, flat projections, isomeric representations or anaglypic three-dimensional images in which the two component images are constructed simultaneously. (1) Perspective representations, Fig. 1a (not shown). The bar II carries a roller carriage 2, to which is secured a bar VI on which slides a roller carriage 5 carrying the member F, and to which is pivoted a bar III pivoted to a sleeve 7a fixed on a stationary bar V. The bar II also carries a roller carriage 4 slidable thereon and constrained by an endless cable 11 to move with the member F. The carriage 4 pivotally carries a bar IV pivoted to a mounting 6 fixed on the bar V. The bars III, IV pass slidably through the sleeves of the slide 3, which carries the stylus Z. The cable 11 passes round pulleys 13 supported on the bar VI and on a bar VII secured to the carriage 2. Movement of the member F in the x-direction (parallel to the bar I) is transmitted to the carriage 4. Movement in the y-direction is transmitted to the carriages 2 and 4. The dimension z is set by moving the carriage 1. (2) Scale changes. The carriage 5 is clamped on the bar VI, so that the distance between the carriages 2 and 4 is constant and movement in the x-direction is taken over by the carriage 1. The stylus Z produces a reduced-scale drawing, and for enlargements the stylus Z and member F are interchanged. (3) Flat projections, Fig. 3a (not shown).- A bar III is adjustably secured to the carriage 1 through an angle scale 14 and slidably carries a carriage 2 supporting the bar VI, which abuts a stop 15 on a bar IV. The bars II, IV are slidable in the sleeves of the slide 3, which carries the member F, and the stylus Z is supported by a carriage 5 slidable on the bar II and connected to the slide 2 by an endless cable 11. (4) Isometric representations, Fig. 4a (not shown). Slidable on the bar II are carriages 2, 4 to which are pivoted bars III, IV which pass through the sleeves of the slide 3. A bar V is slidable in sleeves 7a, 7b fixed to the bars IV, III and carries the stylus Z, the sleeve 7b supporting the line-following member Fs. (5) Anaglyphic three-dimensional images, Figs. 5a and 5b (not shown). The carriage 1 is pivoted by a pin 16 on a fixed plate 17, the bar I carrying rollers 8. A bar III is secured to a rotatable mounting 6 fixed on the bar I at a distance H from the pivot of the carriage 1 corresponding to the viewing height. A bar IV is pivoted to a carriage 4 slidable on the bar III, and the bars II, IV are slidable in the sleeves of the slide 3 carrying the member F. The bars II, III are slidable in a carriage _ 5 supporting the stylus Z. The pin 16 is at the middle of the eye base 18, and at the right-hand point of vision is articulated a thin guide bar 19 which at the other end is articulated on two sides on the bar II by a connection piece 20 half the length of the eye base, so that the bar 19 is always parallel to the bar II. Articulated on the bar 19 is a double drawing device 21 rotatably mounted on the bar II, the styli being adjustable according to the horizontal parallax.