| 摘要 |
<p>1514856 Vacuum cleaners ELECTROLUX Ltd 22 July 1976 [29 Aug 1975] 30624/76 Heading A4F [Also in Division Gl ] Dust collecting suction apparatus includes a contents indicator comprising a cylindrical member 13 rotatably mounted in a transparent cylinder 11 connected to the interior of the dust container, the decrease in container pressure as it fills causing the member to rotate. The rotation is produced by a nut 20 carried by a diaphragm 21 moving against spring 23 as pressure drops in chamber 22. A retaining device comprises normally engaging teeth on end-walls 16, 26 of cylinder 11 and member 13. When pressure in chamber 22 falls the nut must move member 13 a distance "A" before the teeth disengage and allow the member to rotate.</p> |
