| 摘要 |
<p>The head has outer shapes (15, 16) carried by flanges (7, 8) permitting engagement of one of ladder rungs (4) or one of posts (5, 5`) between cutting edges (13, 13`) of the head for spacing of planes (1, 2). The post is situated in a middle of the rung on an inner surface of columns (17, 18) of the plane (1). Return supports on the columns of the plane (2) in a manner to rigidify the transformable ladder into painter`s ladder.</p> |
