| 摘要 |
571,585. Gearing for conveying rotary motion; ratchet gearing. HOOVER, Ltd. Feb. 25, 1944, No. 3513. Convention date, April 26, 1943. [Classes 80 (i) and 80 (iii)] [Also in Group XXVIII] In a fan suction cleaner a filter-cleaning nozzle 46 is mounted on an intermittently rotating arm 47, the motion being transmitted by a slowly rotating grooved cam 66 geared to a motor shaft 31. Riding in the cam groove is a following arm 74, Figs. 2 and 3, rigidly attached to an arm 71 which at 72 is pivoted to plate 73 integral with the cleaning nozzle 46 and at 78 is pivoted to a trailing ratchet foot 79 pressed by a spring 81 against a fixed serrated ring 38 supporting the upper end of the filter 36. |
