in the drawing , a cleaning apparatus according to the invention in the form of a suction apparatus 10 is schematically illustrated . said apparatus comprises a housing 12 having a housing lower part 13 and a housing upper part 14 . the housing lower part 13 forms a dirt - collection container 16 with a suction inlet 17 through which a suction connection piece 18 passes . a suction hose , which is known per se and therefore not illustrated in the drawing and can carry a suction nozzle at its free end , can be connected to the outside of the suction connection piece 18 in a customary manner . a step 21 , which is oriented in a substantially horizontal manner and carries a downwardly directed protection wall 22 at its free end , is integrally formed on the rear face 20 of the dirt - collection container 16 approximately halfway up the dirt - collection container , said rear face being directed away from the suction connection piece 18 . two running wheels are mounted on the housing lower part 13 beneath the step 21 such that they can rotate freely about a common axis of rotation 25 , only one running wheel 23 being illustrated in the drawing , and a support wheel 24 is rotatably mounted on the housing lower part 13 beneath the suction connection piece 18 . the housing upper part 14 is seated on an upper edge in the form of an upper sealing rim 26 of the dirt - collection container 16 and surrounds a cleaning unit in the form of a suction unit 28 having an electric motor 29 and a suction turbine 30 which is driven by said electric motor . the suction unit 28 is carried by a supporting wall 32 which enters the dirt - collection container 16 and has a suction outlet 33 by means of which the suction unit 28 is in flow connection with the dirt - collection container 16 . laterally next to the suction unit 28 , the housing upper part 14 has a battery chamber 35 which is seated on the step 21 and accommodates two rechargeable batteries for supplying power to the suction unit 28 . as an alternative , the suction unit 28 can also be connected to a mains voltage . to this end , the suction apparatus 10 has a connection cable which is known per se and is therefore not illustrated in the drawing . the battery chamber 35 is accessible via a flap 37 which is disposed on the rear face , which is directed away from the suction connection piece 18 , of the housing upper part 14 and forms a chamber wall of the battery chamber 35 and can be pivoted about a pivot axis 38 which is oriented parallel to the rotary shaft 25 . the upper face of the housing upper part 14 has a carrying handle 39 which can be used to raise the housing upper part 14 away from the housing lower part 13 , so that the dirt - collection container 16 can be emptied . the battery chamber 35 can be fitted with two batteries , a single battery being however sufficient to operate the suction apparatus 10 , so that the second battery is employed only when the first battery is depleted . a battery 41 whose physical shape is matched specifically to the suction apparatus 10 is illustrated in fig2 and 3 . the battery 41 is mechanically and electrically connected to the suction apparatus 10 by means of a connecting device 43 which is mounted on the inside of the flap 37 and comprises a mechanical mounting part 44 and an electrical plug connector part 45 . as is clear from fig4 in particular , the mounting part 44 has a flat , rectangular end wall 47 from whose longitudinal sides 48 , 49 and from whose upper transverse side 50 side walls 51 project to the rear , that is to say in the direction of the flap 37 . a screw boss 52 which has an internal thread 53 is integrally formed on each of the side walls 51 on the longitudinal sides . this is clear from fig3 . with its region which borders the upper transverse side 50 , the end wall 47 forms a contact surface 55 which is adjoined by a rectangular aperture 57 which is delimited by two positively locking elements in the form of t - shaped guide rails 59 , 60 on the longitudinal sides . the guide rails 59 , 60 are fixedly connected to one another by means of a connecting wall 62 which is oriented parallel to the contact surface 55 . the connecting wall 62 has a circular opening 63 and extends in the longitudinal direction of the guide rails 59 , 60 only along a subregion of the guide rails 59 , 60 , so that a free space 65 is defined between the two guide rails 59 , 60 above the connecting wall 62 . the two guide rails 59 , 60 each carry a guide rib 66 and , respectively , 67 such that said guide ribs are level with the upper rim of the connecting wall 62 and face one another . the inside of the flap 37 has connection pieces 69 onto which the mounting part 44 can be placed by means of the screw bosses 52 . the connection pieces 69 are provided with a through - hole 70 through which a connecting screw 71 can pass . therefore , the mounting part 44 can be screwed to the flap 37 by means of the connecting screws 71 . in combination with the connecting wall 62 , the guide rails 59 , 60 define an accommodation compartment 73 into which the plug connector part 45 can be inserted from the rear . said plug connector part has a supporting block 75 which carries a circular - cylindrical projection 76 on its front face and , in each case , a guide groove 77 and 78 on outer faces which are directed away from one another . the supporting block 75 carries a plurality of electrical plug contacts 79 on its upper face . if the plug connector part 45 is inserted into the accommodation compartment 73 of the mounting part 44 , the guide ribs 66 , 67 of the mounting part 44 enter the guide grooves 77 and , respectively , 78 of the supporting block 75 , and the projection 76 passes through the opening 63 in the connecting wall 62 . the plug contacts 79 then assume a position within the free space 65 , as can be seen from fig2 for example , and the mounting part 44 can then be screwed to the flap 37 . the mounting part 44 , with the plug connector part 45 inserted in the accommodation compartment 73 and therefore detachably connected to the mounting part 44 , is used when the battery chamber 35 is fitted with a battery 41 which is matched specifically to the suction apparatus 10 . however , if the battery chamber 35 is to be fitted with an extraneous battery 81 , as is illustrated in fig5 and 6 , the mounting part 44 is removed from the flap 37 by the connecting screws 71 being loosened , and the plug connector part 45 is removed from the accommodation compartment 73 of the mounting part 44 . in order to establish a detachable connection to the flap 37 , the plug connector part 45 is then introduced into a receptacle 83 which is disposed on the inside of the flap 37 and on which two guide ribs 84 , 85 are provided at a distance from one another and receive between them the supporting block 75 of the plug connector part 45 by in each case entering a guide groove 77 or , respectively , 78 of the supporting block 75 . the mounting part 44 can be removed from the battery chamber 35 , and an adapter 87 , which is matched firstly to the extraneous battery 81 being used and secondly to the plug connector part 45 , can be placed onto the plug connector part 45 which is introduced into the receptacle 83 . the adapter 87 has electrical contact elements 88 , 89 to which the extraneous battery 81 can be connected and which are connected to connection contacts of the adapter 87 , which connection contacts can be electrically connected to the plug contacts 79 of the plug connector part 45 , by means of connecting lines which run within the adapter 87 and are not illustrated in the drawing . securing the plug connector part 45 optionally either on the mounting part 44 or on the inside of the flap 37 therefore makes it possible , in a structurally simple manner , to alternatively insert into the battery chamber 35 either batteries 41 which are matched specifically to the suction apparatus 10 or extraneous batteries 81 , only one additional adapter 87 being required when an extraneous battery 81 is used , it being possible to screw said adapter to the flap 37 in a similar manner to that used for the mounting part 44 using the connecting screws 71 . to this end , the adapter 87 has two screw bosses 90 , 91 which can be placed onto the connection pieces 69 of the flap 37 .
the invention relates to a cleaning apparatus comprising a cleaning unit driven by an electric motor and a housing which has a battery chamber for accommodating at least one rechargeable battery , a connecting device having a mechanical mounting part and an electrical plug connector part being disposed in the battery chamber for establishing an electrical and mechanical connection between the battery and the cleaning apparatus . in order to further develop said cleaning apparatus in such a way that batteries of different physical shapes can be used , the invention proposes that the mounting part is detachably mounted in the battery chamber , and the plug connector part is detachably connectable as desired to the mounting part or to a chamber wall of the battery chamber .