Impact Tools With Rigidly Coupled Impact Mechanisms
First Claim
1. An impact tool comprising:
- an impact mechanism comprising a hammer and an anvil, the hammer being configured to rotate about a first axis and to periodically impact the anvil to drive rotation of the anvil about the first axis;
an electric motor comprising a rotor that is directly coupled to the impact mechanism, the electric motor being configured to drive rotation of the hammer about the first axis;
wherein the motor rotates the hammer in a first direction, and the hammer causes the rotor to periodically stop rotating in the first direction when the hammer periodically impacts the anvil; and
a control circuit that supplies a current to the electric motor and limits the current supplied to the electric motor.
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Accused Products
Abstract
Illustrative embodiments of impact tools with impact mechanisms rigidly coupled to electric motors are disclosed. In at least one illustrative embodiment, an impact tool may comprise an impact mechanism, an electric motor, and a control circuit. The impact mechanism may comprise a hammer and an anvil, the hammer being configured to rotate about a first axis and to periodically impact the anvil to drive rotation of the anvil about the first axis. The electric motor may comprise a rotor that is rigidly coupled to the impact mechanism, the electric motor being configured to drive rotation of the hammer about the first axis. The control circuit may be configured to supply a current to the electric motor and to prevent the current from exceeding a threshold in response to the hammer impacting the anvil.
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Citations
21 Claims
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1. An impact tool comprising:
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an impact mechanism comprising a hammer and an anvil, the hammer being configured to rotate about a first axis and to periodically impact the anvil to drive rotation of the anvil about the first axis; an electric motor comprising a rotor that is directly coupled to the impact mechanism, the electric motor being configured to drive rotation of the hammer about the first axis; wherein the motor rotates the hammer in a first direction, and the hammer causes the rotor to periodically stop rotating in the first direction when the hammer periodically impacts the anvil; and a control circuit that supplies a current to the electric motor and limits the current supplied to the electric motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An impact tool comprising:
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a swinging weight impact mechanism comprising a hammer frame supporting a hammer that rotates about a first axis, the hammer being pivotably coupled to the hammer frame such that the hammer is also configured to pivot about a second axis different from the first axis, and an anvil configured to rotate about the first axis when impacted by the hammer; and an electric motor comprising a rotor that is directly coupled to the swinging weight impact mechanism, the electric motor being configured to drive rotation of the hammer about the first axis in a first direction; wherein the rotor is directly coupled to the swinging weight impact mechanism such that rotation of the rotor in the first direction rotates the hammer in the first direction, and when the hammer stops rotating in the first direction the rotor is concurrently stopped rotating in the first direction. - View Dependent Claims (15, 16, 17)
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18. An impact tool comprising:
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an electric motor comprising a rotor configured to rotate about a first axis; and an impact mechanism comprising a hammer configured to rotate about the first axis and an anvil configured to rotate about the first axis when impacted by the hammer; wherein the hammer comprises a hammer base directly coupled to the rotor to rotate therewith about the first axis and a hammer jaw configured to translate parallel to the first axis between a disengaged position and an engaged position in response to rotation of the hammer base about the first axis such that the hammer jaw rotates about the first axis without impacting the anvil when in the disengaged position and impacts the anvil when in the engaged position; wherein the rotor is directly coupled to the hammer base such that rotation of the rotor in a first direction about the first axis rotates the hammer in the first direction about the first axis, and when the hammer stops rotating in the first direction about the first axis the rotor is concurrently stopped rotating in the first direction about the first axis. - View Dependent Claims (19, 20, 21)
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Specification