| 摘要 |
Drawing and writing board may be produced from various material, plastics, clirite, copper, aluminium and etc. And according to different dimensions thereof. The board consists of a frame (1), a board (2), a channel (3), a ruler (4) with a channel (5). The ruler (4) is cut through along the centre of two thirds of its length that enables its turning along the channel (3) by means of its holders (8) that are in the form of a pin where around the body of a holder (8) is put a spiral spring (10) that thrusts a ruler (4) along the board (2) that is from all four sides engraved as milimeter units (6). Frame (12) couples in a whole a frame (1) and a board (2). Below a frame (12) there is a channel (3) along which a ruler (4) revolves without taking down and thus it enables drawing a horisontal, vertical and downward lines. Paper holders (for drawing and spare paper are in the form of a pin and around its body (14) and have a spiral spring (15) that holds a paper for drawing and by its extended parts (15) keeps a spare paper (18) to the board (2) where there are a pencil (16) with its holders (17). Hatching screws (19) fix the frame (1) and the board (2) into one wholeness.
|
