Oscillatory drive
First Claim
Patent Images
1. An oscillatory drive comprising a housing;
- a tool drive shaft arranged within said housing;
a rotating drive shaft arranged within said housing at an angle to said tool drive shaft;
an eccentric element located on said drive shaft and having a spherical outer surface;
a pivot element having a first end and a second end, said pivot element being fixed on said tool drive shaft at its first end and having a partially cylindrical inner surface at its second end, said partially cylindrical inner surface of said pivot element engaging said spherical outer surface of said eccentric element for oscillatingly driving said tool drive shaft pivoting back and forth about a longitudinal axis thereof;
wherein said second end of said pivot element comprises a first outer side facing a first section of said housing and a second outer side opposite said first outer side and facing a second section of said housing;
a first spring held between said first outer side of said pivot element and said first section for biasing said pivot element into a first direction; and
a second spring held between said second outer side of said pivot element and said second section for biasing said pivot element into a second direction opposite said first direction.
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Abstract
An oscillatory drive comprising a rotating drive shaft is disclosed. The oscillatory drive is driven by an eccentric element that is coupled via a pivot element to a tool drive shaft arranged at an angle to the drive shaft for oscillatingly driving the tool drive shaft pivoting back and forth about its longitudinal axis. The eccentric element comprises a spherical outer ring which is guided within an at least partially cylindrical inner surface of the pivot element. By spring biasing the free end of the pivot element at both outer sides against the housing, efficiency is improved and vibrations are reduced.
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Citations
16 Claims
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1. An oscillatory drive comprising
a housing; -
a tool drive shaft arranged within said housing;
a rotating drive shaft arranged within said housing at an angle to said tool drive shaft;
an eccentric element located on said drive shaft and having a spherical outer surface;
a pivot element having a first end and a second end, said pivot element being fixed on said tool drive shaft at its first end and having a partially cylindrical inner surface at its second end, said partially cylindrical inner surface of said pivot element engaging said spherical outer surface of said eccentric element for oscillatingly driving said tool drive shaft pivoting back and forth about a longitudinal axis thereof;
wherein said second end of said pivot element comprises a first outer side facing a first section of said housing and a second outer side opposite said first outer side and facing a second section of said housing;
a first spring held between said first outer side of said pivot element and said first section for biasing said pivot element into a first direction; and
a second spring held between said second outer side of said pivot element and said second section for biasing said pivot element into a second direction opposite said first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An oscillatory drive comprising
a tool drive shaft; -
a rotating drive shaft arranged at an angle to said tool drive shaft;
an eccentric element located on said drive shaft and having a spherical outer surface;
a pivot element having a first end and a second end, said pivot element being fixed on said tool drive shaft at its first end and having a partially cylindrical inner surface at its second end, said partially cylindrical inner surface of said pivot element engaging said spherical outer surface of said eccentric element for oscillatingly driving said tool drive shaft pivoting back and forth about a longitudinal axis thereof.
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14. An oscillatory drive comprising
a housing; -
a tool drive shaft arranged within said housing;
a rotating drive shaft arranged within said housing at an angle to said tool drive shaft;
an eccentric element located on said drive shaft and having a spherical outer surface;
a pivot element having a first end and a second end, said pivot element being fixed on said tool drive shaft at its first end and engaging said eccentric element at its second end for oscillatingly driving said tool drive shaft pivoting back and forth about a longitudinal axis thereof;
wherein said second end of said pivot element comprises a first outer side facing a first section of said housing and a second outer side opposite said first outer side and facing a second section of said housing;
a first spring held between said first outer side of said pivot element and said first section for biasing said pivot element into a first direction; and
a second spring held between said second outer side of said pivot element and said second section for biasing said pivot element into a second direction opposite said first direction.
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15. A power tool comprising
a housing; -
an oscillatory drive arranged within said housing for oscillatingly driving a tool drive shaft about a longitudinal axis thereof;
wherein said oscillatory drive comprises a rotating drive shaft arranged at an angle to said tool drive shaft;
an eccentric element located on said drive shaft and having a spherical outer surface;
a pivot element having a first end and a second end, said pivot element being fixed on said tool drive shaft at its first end and having a partially cylindrical inner surface at its second end, said partially cylindrical inner surface of said pivot element engaging said spherical outer surface of said eccentric element for pivoting said tool drive shaft back and forth about said longitudinal axis.
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16. A power tool comprising
a housing; -
an oscillatory drive arranged within said housing for oscillatingly driving a tool drive shaft about a longitudinal axis thereof;
wherein said oscillatory drive comprises a rotating drive shaft arranged within said housing at an angle to said tool drive shaft;
an eccentric element located on said drive shaft and having a spherical outer surface;
a pivot element having a first end and a second end, said pivot element being fixed on said tool drive shaft at its first end and engaging said eccentric element at its second end for pivoting said tool drive shaft back and forth about said longitudinal axis;
wherein said second end of said pivot element comprises a first outer side facing a first section of said housing and a second outer side opposite said first outer side and facing a second section of said housing;
a first spring held between said first outer side of said pivot element and said first section for biasing said pivot element into a first direction; and
a second spring held between said second outer side of said pivot element and said second section for biasing said pivot element into a second direction opposite said first direction.
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Specification