Power tool with a rotating and/or hammering drive mechanism
A handheld power tool with a rotating and/or hammering drive mechanism for a tool ( 11 ) that can be inserted into a tool receptacle ( 10 ) has a unit which transmit the rotation of a motor shaft ( 5 ) to an intermediate shaft ( 7 ), by which the tool receptacle ( 10 ) is set into a rotary motion and/or a hammering motion. A compact construction of the handheld power tool is attained by providing that the motor shaft ( 5 ) is coupleable or is coupled to the intermediate shaft ( 7 ) in one axis.
1. A handheld power tool comprising a housing; a tool receptacle; a motor having a motor shaft; an intermediate shaft; means for transmitting a rotation of said motor shaft to a rotary motion of said intermediate shaft; a drive mechanism for a tool insertable into said tool receptacle, wherein said drive mechanism is provided with means for converting the rotary motion of said intermediate shaft into a rotary motion of said tool receptacle and means for converting the rotary motion of said intermediate shaft into a hammering motion of said tool receptacle, wherein said motor shaft is coaxial with said intermediate shaft, said motor shaft and said intermediate shaft having two opposite ends including a first end which is facing said motor and a second end which is facing said receptacle, said means for converting the rotary motion of said intermediate shaft into a rotary motion of said tool receptacle and said means for converting the rotary motion of said intermediate shaft into a hammering motion of said tool receptacle being located between said first and second ends on said motor shaft and said intermediate shaft.
2. A handheld power tool as defined in claim 1 , wherein said motor shaft and said intermediate shaft are unitary with each other.
3. A handheld power tool as defined in claim 1 , further comprising means for coupling said motor shaft to said intermediate shaft coaxially.
4. A handheld power tool as defined in claim 1 , wherein said motor is an electronically commutated DC motor.
5. A handheld power tool as defined in claim 4 , wherein said electronically commutated DC motor has an external rotor and a stator.
6. A handheld power tool as defined in claim 1 , wherein said motor shaft is rotatably supported on its end facing away from said intermediate shaft in a stator of said motor.
7. A handheld power tool as defined in claim 1 , wherein said means for converting the rotary motion of said intermediate shaft into the rotary motion of said tool receptacle is arranged closer to said second end, while said means for converting the rotary motion of said intermediate shaft into the hammering motion of said tool receptacle is located closer to said first end of said motor shaft and said intermediate shaft.
8. A handheld power tool as defined in claim 7 , further comprising a first supporting element which supports said first end of said motor shaft and said intermediate shaft and a second supporting element which supports said second end of said motor shaft and said intermediate shaft, said means for converting the rotary motion of said intermediate shaft into the rotary motion of said receptacle and said means for converting said rotary motion of said intermediate shaft into the hammering motion of said tool receptacle are located between said supporting elements.