Electric motor for hand held appliance

Claim 1

A HAND HELD POWER TOOL OF THE TYPE WHICH INCLUDES ELECTRIC HAIR CLIPPERS, HAVING AN ELONGATED HOUSING WHICH IS ADAPTED TO BE HELD IN THE PALM OF THE HAND AND WHICH ENCLOSES AN ELECTRIC MOTOR COMPRISING A ROTOR HAVING ITS SHAFT JOURNALED IN COAXIAL SPACED APART FRONT AND REAR BEARINGS IN THE HOUSING AND A WOUND STATOR HAVING AN ANNULAR CORE OF MAGNETIC MATERIAL WHICH IS MOUNTED IN THE HOUSING COAXIALLY WITH THE ROTOR, SAID HAND TOOL BEING FURTHER CHARACTERIZED BY THE FOLLOWING: (A) THE HOUSING HAVING (1) A SUBSTANTIALLY TUBULAR SIDE WALL BY WHICH THE STATOR CORE IS EMBRACED AND COAXIALLY SUPPORTED, (2) MEANS NEAR THE FRONT OF THE HOUSING PROVIDING A COAXIAL FRONT ROTOR SHAFT BEARING SUPPORT, (3) A REARWARDLY FACING THRUST ABUTMENT FORWARDLY OF SAID BEARING SUPPORT AND COAXIAL THEREWITH, AND (4) ANOTHER REARWARDLY FACING ABUTMENT SPACED RADIALLY OUTWARDLY FROM THE BEARING SUPPORT AND ENGAGEABLE WITH A FORWARDLY FACING SURFACE ON THE STATOR CORE; (B) AN END FRAME IN THE HOUSING, BEHIND THE STATOR CORE, ENGAGING THE SIDE WALL OF THE HOUSING AT CIRCUMFERENTIALLY SPACED LOCATIONS AND IS THEREBY SUPPORTED COAXIALLY WITH THE STATOR CORE, AND SAID END FRAME HAVING (1) MEANS PROVIDING A COAXIAL SUPPORT FOR THE REAR ROTOR SHAFT BEARING, AND (2) A FORWARDLY FACING THRUST ABUTMENT REARWARDLY OF SAID BEARING SUPPORT AND COAXIAL THEREWITH; (C) MEANS RELEASABLY ENGAGED WITH THE TUBULAR SIDE WALL OF THE HOUSING, BEHIND THE END FRAME, PROVIDING ANOTHER FORWARDLY FACING ABUTMENT IN THE HOUSING THAT PREVENTS REARWARD DISPLACEMENT OF THE END FRAME OUT OF THE HOUSING; (D) YIELDING BIAS MEANS REACTING BETWEEN THE STATOR CORE AND THE END FRAME TO URGE THE STATOR CORE FORWARDLY INTO ENGAGEMENT WITH SAID OTHER REARWARDLY FACING ABUTMENT AND TO URGE THE END FRAME REARWARDLY INTO ENGAGEMENT WITH SAID OTHER FORWARDLY FACING ABUTMENT; (E) MEANS ON EACH END OF THE ROTOR SHAFT DEFINING AN END THRUST BEARING WITH A SURFACE WHICH CONVERGES AXIALLY OUTWARDLY TO A POINT COAXIAL WITH THE SHAFT; AND (F) OTHER BIASING MEANS REACTING BETWEEN THE END THRUST BEARING AT THE REAR END OF THE SHAFT AND SAID FORWARDLY FACING THRUST ABUTMENT TO URGE THE END THRUST BEARING AT THE FRONT END OF THE SHAFT INTO ENGAGEMENT WITH THE REARWARDLY FACING THRUST ABUTMENT, THEREBY PREVENTING END PLAY OF THE SHAFT AND MAINTAINING THE ROTOR IN A PREDETERMINED AXIAL RELATION TO THE STATOR REGARDLESS OF THE AXIAL RELATIONSHIP OF THE END FRAME TO THE STATOR.