Draft for blackboards and whiteboards perfected the type used on wax or slate for removing write with chalk or the like, comprising a carriage (2) arranged on a horizontal guide (1) suitable for washing installed on a blackboard ( 9) or wax, wherein the carriage (2) a horizontal axis (10) between two supports (11) which are preferably two pulleys (4) forced by a spring (3) or spring and existing in the channel of each pulley (4) a cable (5) or flexible cord wrapped around the two cables (5) at its free end to a crossbar (6), of a certain size, which on its side facing the board being attached (9) a band (8) erasing member and on its outer side a handle (7); that the spring (3) is suitable for establishing a quiescent state with os cables (5) wound on respective pulleys (4) and the bar (6) adjacent the carriage (2), but capable of being overcome by alsestirar user action handle (7) for the draft down and extend the amount of cable (5) necessary; because in a preferred embodiment both cables (5) or strands have sufficient for the draft (8) covering the entire height of the board (9) from its upper edge to the lower edge length; because the horizontal guide (1) spans the width of the board (9) being susceptible carriage (2) to move along its length; because the eraser strip (8) is preferably constituted by a plurality of cerdillas synthetic or natural, short and very dense material; and because in a preferred embodiment the handle (7) is arranged on the outer side of the bar (6), opposite to the board (9) in orthogonal arrangement with said bar (6). (Machine-translation by Google Translate, not legally binding)
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