| 摘要 |
<p>Ball catch for folding rulers, especially with visible rivet, whose parts are mutually rotary embedded and are set into end areas of adjoining parts (4) of the ruler. The essence of the invention is that ball catch comprises two flat moulded disks (1,2) of round outline provided with median openings (12,22) for rivet (3), where the diameter of both disks (1,2) is smaller than the width of the parts (4), whereas base (11) of the fixed disk (1) and the body (21) of the positioning disk (2) are modified partly for allowance of their mutual arrest in the selected positions and partly for their tight set in into the parts (4) of the ruler.</p> |
