| 摘要 |
456,322. Book-supports. PETERSEN, O. E., Taastrup, Denmark. June 17, 1936, No. 16899. [Class 52 (i)] A rectangular wooden block 3 has at its upper end a screw 4 on which may be adjusted a nut 6 with a rubber sleeve 7; this block is placed upon a shelf, and the nut is ad. justed until the upper end of the sleeve contacts with the shelf above it. As shown, the screw 4 is fitted in a block 15 which is moved in guides 14 by contact with the upper end of a lever 12 pivoted at 11 and moved by a handle 16. A subject-matter indicator may be attached to the lower end of the block 3. |
