Patent Publication Number: US-4835814-A

Title: Vacuum cleaner

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a vacuum cleaner having a main body and a suction unit which comprises a suction nozzle and a suction hose for communicating the nozzle with the main body. 
     2. Description of the Prior Art 
     In vacuum cleaners, particularly floor-type vacuum cleaners, the suction nozzle communicates via a suction hose with the motor housing so as to be spatially separated therefrom, thereby making the handling of the vacuum cleaner easier since the suction nozzle together with the hose is easier to move than the motor housing. It is also known to hook the suction unit onto the vacuum cleaner housing when the vacuum cleaner is being transported or is not in use. This has the advantage that the vacuum cleaner can easily be transported together with the suction unit mounted thereon but is still ready for operation by means of a handle. There is however the disadvantage that the appliance has to be switched on and off at the motor housing. 
     SUMMARY OF THE INVENTION 
     According to the invention there is provided a vacuum cleaner having a main body, a suction unit which comprises a suction nozzle and a suction hose for communicating the nozzle with the main body, mounting means on the suction unit for mounting the unit on the main body, and an electrical switch provided on the main body and arranged to be operated by the mounting means. 
     When the vacuuming process is interrupted, e.g. for the purpose of carrying the vacuum cleaner into another room or in order to break off for a short time to do something else, the suction unit is mounted on the main body using the mounting means. By so mounting the suction unit the electrical switch is operated to switch off the appliance. If the suction unit is removed from the main body in order to resume the vacuum cleaning operation, the appliance is automatically switched on again. There is consequently no need to operate a switch which may be provided separately on the main body each time the vacuum-cleaning operation is interrupted for a short time. Thus a vacuum cleaner may be rendered voltage-free by suitable means when the vacuuming process is interrupted without having separately to operate an electrical switch on the vacuum cleaner housing. 
     Preferably the mounting means comprises a hook device on the suction unit connectible to a mounting on the main body, the electrical switch being provided in the region of said mounting. The switch may be mounted inside a motor housing. Known switches such as touch switches, micro switches, sensor switches, magnetic switches or reed switches may be used. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     The drawing shows a partial view of the vacuum cleaner main body with the suction unit mounted thereon. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     A preferred embodiment of the invention will now be described wherein the main body of the vacuum cleaner includes a motor housing 1 on which the suction unit is mounted. The suction unit consists of a suction hose (not shown) with a handle, a suction tube 2, a suction nozzle 3 and a hook means 4 mounted with the suction tube 2. The hook means 4 is operably connected to a hook shaped mounting 5 provided on the housing 1. Inside the housing 1 an electrical switch 6 is provided. The switching button 7 of the switch 6 (dashed lines) protrudes through the housing wall in the region of the mounting 5. The switch 6 is actuated by means of the hook means 4 which, in the position shown, also the full line position of switching button 7, renders the vacuum cleaner motor voltage-free by means of the switching button 7 of the switch 6. 
     Modifications of the invention as disclosed herein both in its broad aspects and its preferred embodiment may be apparent to a person skilled in the art and it is intended that such modifications be encompassed within the scope of this disclosure.