| 摘要 |
<p>In an installation for moving sludge along the bottom of a settling tank with a scraper or removing solids with a rake from a grating, in which a traveling carriage moves the scraper or rake back and forth, the reciprocating movement of the carriage is made to power the shift of position of the scraper or rake from an operating position for movement in one direction to an idling position for movement in the other direction, by interplay of a guideway and a spring-actuated extension arm. A skimmer for collecting floating solids is similarly operated. A hydraulic interlock may be used for maintaining the operating arm of the apparatus in position during travel between the end locations where its position is shifted.</p> |
