Power hand tool, especially impact screwdriver
AssigneeAtlas Copco Elektrowerzeuge GmbH
InventorArmin Eisenhardt
Life of this patent
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Abstract
In a power hand tool, especially a screwdriver, with a motor, a planet gear and a rotary impulse generator, a spring mechanism is provided to damp vibrations of the housing caused by the rotary impulse generator. To improve the damping with a simple design, one end of a compression spring is supported on a ring, which in turn is guided at a coil which is parallel to the axis, on the one hand, and is guided displaceably in parallel to the axis between a part rigidly connected to the housing and a part exposed to the rotary impact, on the other hand. The other end of the compression spring is supported on a part rigidly connected to the housing.
Claims15
A power hand tool, comprising:
- a housing;
- a motor disposed in said housing;
- a reducing gear disposed in said housing;
- a rotary impulse generator disposed in said housing;
- spring damping means for damping vibrations of said housing caused by said rotary impulse generator including coil guide means which is parallel to an axis of rotation, a ring guided at said coil guide means, said coil guide means for displaceably guiding said ring in parallel to said axis of rotation, a spring and a part rigidly connected to said housing, said spring having one end supported on said ring and having another end supported on said part rigidly connected to said housing whereby said ring is axially tensioned during a rotary impact.
Dependencies are inferred from the claim text.