Hand-held and hand-guided motor driven polishing or sanding tool

Abstract

The invention refers to a hand-held and hand-guided motor driven polishing or sanding tool ( 2 ). The tool ( 2 ) has a tool housing ( 4 ) and a motor ( 6; 62 ) located therein. The tool ( 2 ) further has a polishing or sanding working element ( 8 ) attached to a tool shaft ( 10 ) of the tool ( 2 ). The motor ( 6; 62 ) is adapted to drive the tool shaft ( 10 ) in a first direction of rotation ( 12 ). It is suggested that the tool ( 2 ) is equipped with a switch ( 44 ) for changing the sense of rotation of the tool shaft ( 10 ) between the first direction of rotation ( 12 ) and a second direction of rotation ( 42 ) opposite to the first direction of rotation ( 12 ).

1 . A hand-held and hand-guided motor driven polishing or sanding tool ( 2 ), having a tool housing ( 4 ) and a motor ( 6 ;  62 ) located therein and a tool shaft ( 10 ) with a polishing or sanding working element ( 8 ) attached thereto, wherein the motor ( 6 ;  62 ) is configured to drive the tool shaft ( 10 ) in a first direction of rotation ( 12 ), wherein
 the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises a switch ( 44 ) for changing the sense of rotation of the tool shaft ( 10 ) between the first direction of rotation ( 12 ) and a second direction of rotation ( 42 ) opposite to the first direction of rotation ( 12 ).   
     
     
         2 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 1 , wherein the switch ( 44 ) is configured to be actuated from outside the tool housing ( 4 ). 
     
     
         3 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 1 , wherein the switch ( 44 ) is configured to be manually actuated by a user of the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) without using a specific actuating tool. 
     
     
         4 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 1 , wherein the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises a gear transmission ( 36 ) located between the motor ( 6 ;  62 ) and the tool shaft ( 10 ), the gear transmission ( 36 ) being configured to change the sense of rotation of the tool shaft ( 10 ) between the first direction of rotation ( 12 ) and the second direction of rotation ( 42 ) upon actuation of the gear transmission ( 36 ), and the switch ( 44 ) being configured to actuate the gear transmission ( 36 ). 
     
     
         5 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 1 , wherein the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises an electric motor ( 6 ), and the switch ( 44 ) is configured to invert the flow direction of electric current through the electric motor ( 6 ), including by means of an electric switch ( 84 ). 
     
     
         6 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 1 , wherein the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises a pneumatic motor ( 62 ), and the switch ( 44 ) is configured to invert the flow direction of pressurized air through the pneumatic motor ( 62 ), including by means of a pneumatic switching valve ( 68 ). 
     
     
         7 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 1 , wherein the polishing or sanding working element ( 8 ) is indirectly attached to the tool shaft ( 10 ) by means of an eccentric element ( 50 ), the eccentric element ( 50 ) being attached to the tool shaft ( 10 ) in a torque proof manner, and the polishing or sanding working element ( 8 ) being attached to the eccentric element ( 50 ) in a freely rotatable manner in respect to the eccentric element ( 50 ). 
     
     
         8 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 7 , wherein the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises means for holding a rotational position of the polishing or sanding working element ( 8 ) with respect to the tool housing ( 4 ) or means ( 58 ) for limiting a rotational movement of the polishing or sanding working element ( 8 ) in respect to the tool housing ( 4 ). 
     
     
         9 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 1 , wherein the polishing or sanding working element ( 8 ) is directly attached to the tool shaft ( 10 ) resulting in a rotational working movement of the polishing or sanding working element ( 8 ). 
     
     
         10 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 1 , wherein the polishing or sanding working element ( 8 ) is indirectly attached to the tool shaft ( 10 ) by means of a gear arrangement ( 60 ), including a planetary gear arrangement, resulting in a gear-driven or roto-orbital working movement of the polishing or sanding working element ( 8 ). 
     
     
         11 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 2 , wherein the switch ( 44 ) is configured to be manually actuated by a user of the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) without using a specific actuating tool. 
     
     
         12 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 2 , wherein the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises a gear transmission ( 36 ) located between the motor ( 6 ;  62 ) and the tool shaft ( 10 ), the gear transmission ( 36 ) being configured to change the sense of rotation of the tool shaft ( 10 ) between the first direction of rotation ( 12 ) and the second direction of rotation ( 42 ) upon actuation of the gear transmission ( 36 ), and the switch ( 44 ) being configured to actuate the gear transmission ( 36 ). 
     
     
         13 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 2 , wherein the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises an electric motor ( 6 ), and the switch ( 44 ) is configured to invert the flow direction of electric current through the electric motor ( 6 ), including by means of an electric switch ( 84 ). 
     
     
         14 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 2 , wherein the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises a pneumatic motor ( 62 ), and the switch ( 44 ) is configured to invert the flow direction of pressurized air through the pneumatic motor ( 62 ), including by means of a pneumatic switching valve ( 68 ). 
     
     
         15 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 2 , wherein the polishing or sanding working element ( 8 ) is indirectly attached to the tool shaft ( 10 ) by means of an eccentric element ( 50 ), the eccentric element ( 50 ) being attached to the tool shaft ( 10 ) in a torque proof manner, and the polishing or sanding working element ( 8 ) being attached to the eccentric element ( 50 ) in a freely rotatable manner in respect to the eccentric element ( 50 ). 
     
     
         16 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 15 , wherein the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises means for holding a rotational position of the polishing or sanding working element ( 8 ) with respect to the tool housing ( 4 ) or means ( 58 ) for limiting a rotational movement of the polishing or sanding working element ( 8 ) in respect to the tool housing ( 4 ). 
     
     
         17 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 2 , wherein the polishing or sanding working element ( 8 ) is directly attached to the tool shaft ( 10 ) resulting in a rotational working movement of the polishing or sanding working element ( 8 ). 
     
     
         18 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 2 , wherein the polishing or sanding working element ( 8 ) is indirectly attached to the tool shaft ( 10 ) by means of a gear arrangement ( 60 ), including a planetary gear arrangement, resulting in a gear-driven or roto-orbital working movement of the polishing or sanding working element ( 8 ). 
     
     
         19 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 3 , wherein the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises a gear transmission ( 36 ) located between the motor ( 6 ;  62 ) and the tool shaft ( 10 ), the gear transmission ( 36 ) being configured to change the sense of rotation of the tool shaft ( 10 ) between the first direction of rotation ( 12 ) and the second direction of rotation ( 42 ) upon actuation of the gear transmission ( 36 ), and the switch ( 44 ) being configured to actuate the gear transmission ( 36 ). 
     
     
         20 . The hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) according to  claim 3 , wherein the hand-held and hand-guided motor driven polishing or sanding tool ( 2 ) comprises an electric motor ( 6 ) and the switch ( 44 ) is configured to invert the flow direction of electric current through the electric motor ( 6 ), including by means of an electric switch ( 84 ).