| 摘要 |
726,774. Washing-machines. BOSCH, GES., R. May 30, 1951 [Oct. 1, 1948 ; Oct. 1, 1948], No. 12654/51. Class 138 (2). [Also in Groups XXXV and XXXVIII] A washing-appliance, e.g. for immersion in a washing-boiler, consists of an electromagnetically-actuated diaphragm vibrator in which the movement of the diaphragm is abruptly limited by a stop and the electromagnet is enclosed in a water-tight casing sealed by the diaphragm and having means to prevent excessive pressure in the casing. When A.C. is passed through the coil 15, Fig. 9, the armature 12 secured to the diaphragm 10 hammers against the core 14. The water-tight casing 16 has apertures 430 covered by bellows 410 which permit expansion of the air within the casing. In modifications, the bellows are dispensed with and the casing 16 communicates through a tube 19 with either a large expansion chamber or a leaky non- return valve. In further modifications, two diaphragms 31, 32, Fig. 3, are driven by opposed electromagnets 35, 36 or the two diaphragms may be connected to the armature and core, respectively, of a single electromagnet. A resonating bar or disc may be secured to the diaphragm.
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