JPS5463558A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To provide a vacuum cleaner which enhances its safety by controlling a rotary brush by the pneumatic pressure difference change detecting operation of a detection actuator provided in a hole communicated with the atmosphere at the negative pressure side of a vacuum cleaner body case. CONSTITUTION:Since negative pressure is retained in a vacuum cleaner body case 1 by the suction of a motor driven blower 2 to extend thereby a Bourdon tube, the contacts 16 of a controller 21 are connected to the contacts 17 of a terminal to drive the blower 2 at high speed and to accordingly rotate a rotary brush 9 cooperated via a belt 24 with the blower 2 so as to separate and float dusts and to then intake them by the blower 2. When the case 1 is inclined or is floated from the then intake them by the blower 2. When the case 1 is inclined or is floated from the surface to be cleaned of the floor, the negative pressure in the case 1 is reduced to contract upwardly the tube 13. Thus, rockable member 14 connected to the tube 13 is rocked to cause the contacts 16 to make contact with the contacts 18 to shift the blower 2 to low speed and the brush 9 also to low speed. When the case 1 is further inclined to turn upside down to cause the suction port 8 to largely open, the pressure in the case 1 becomes atmospheric pressure to cause the contacts 16 to make contact with the contacts 19 so as to thereby stop the blower 2 and the brush 9.