Pantographic device for true-to-scale drawing of structures - employs laser beam directed along hollow arm for reflection at right angles to plane of projection

摘要

The pantographic appts. has a parallelogram-shaped scissors arrangement of rectangular light-alloy rods comprising two long arms (18,20) rotatable through 360 deg. about axes in parallel radial planes. A scanner with a grip rod (50) is rotated about an extension of the optical axis. The plotting element (46) is held (48) above a drawing-board (44) on a free-standing tripod (10) with a counterweight (28) for the pantograph adjustable along the first arm (18). ADVANTAGE - Easily operated device produces small-scale accurate drawings of sensitive and/or poorly accessible objects of considerable size, without mechanical contact.