Hand held power tool including inertia switch
First Claim
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1. A hand-held tool comprising:
- a hand engaging portion, an output element, a motor adapted to be coupled to a power source and selectively coupled to said output element for imparting motion thereto relative to a work piece, and inertia responsive means for disconnecting said output element from the power source should said hand engaging portion move at a rate greater than a predetermined rate.
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Abstract
A hand held power tool includes a motor coupled to an output element and an inertia switch operative to disable the output element upon movement of the tool at a rate greater than a determined rate. The inertia switch disables the output element by open circuiting the motor or uncoupling the output element from the motor.
66 Citations
22 Claims
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1. A hand-held tool comprising:
- a hand engaging portion, an output element, a motor adapted to be coupled to a power source and selectively coupled to said output element for imparting motion thereto relative to a work piece, and inertia responsive means for disconnecting said output element from the power source should said hand engaging portion move at a rate greater than a predetermined rate.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electric power tool comprising:
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a housing having a handle; an output element supported by said housing; an electric motor adapted to be connected to an electrical power source such that said motor, when energized, connects said output element to the electrical power source to impart rotational movement to said output element; and an inertia responsive element operable to disconnect said output element from the electrical power source in response to rapid movement of said handle. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An electric power tool comprising:
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a housing having a handle; an output element supported by said housing and having an axis of rotation; an electric motor adapted to be connected to an electrical power source such that said motor, when energized, connects said output element to the electrical power source to impart rotational movement on said output element, said motor including a winding and a rotor connected in series and adapted to be connected in series to the electrical power source, said rotor selectively coupled to said output element; and an inertia responsive switch disconnecting said output element from the electrical power source in response to rapid rotation of said handle, said inertia switch being a one of either directionally responsive and located in spaced relation to said axis or rotationally responsive and located along said axis, and said inertia responsive switch disconnecting said output element from the electrical power source by a one of either disconnecting said winding and said rotor from the electrical power source or disconnecting said output element from said rotor. - View Dependent Claims (21, 22)
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Specification