Back to results
US 8,408,327 B2Granted
Method for operating a power driver
AssigneeBlack & Decker Inc.
InventorsMichael Forster, Bhanuprasad V. Gorti, Sam Woods, Craig Schell, Nathan Cruise
Life of this patent
Estimating the term…
Abstract
A method for operating a driving tool, such as a fastening tool, that has a driver, a motor assembly with a motor and an output member, and an electrical power source. The methodology includes transmitting electrical power to the motor to rotate the output member and thereafter adjusting one or more control parameters if a rotational speed of the output member is not within a predetermined operating range.
Claims25
A method comprising:
- providing a driving tool having a driver, a motor assembly and an electrical power source, the driver being movable along an axis, the motor assembly including a motor and an output member, that is driven by the motor and employed to transmit power to the driver to thereby cause the driver to translate along the axis;
- setting a time interval of a first cycle portion;
- transmitting electrical power from the electrical power source to the motor over the first cycle portion to thereby rotate the output member, wherein transmission of electrical power to the motor is interrupted after the first cycle portion;
- determining a parameter related to a rotational speed of the output member;
- operating the driving tool to transmit power from the output member to the driver to advance the driver after the first cycle portion is complete;
- and
- increasing the time interval of the first cycle portion after electrical power to the motor has been interrupted after the first cycle portion if a magnitude of the parameter is less than a predetermined threshold.
4 more elements
A method comprising:
- providing a driving tool having a driver, a motor assembly and an electrical power source, the driver being movable along an axis, the motor assembly including a motor and an output member, that is driven by the motor and employed to transmit power to the driver to thereby cause the driver to translate along the axis;
- setting a time interval of a first cycle portion;
- transmitting electrical power from the electrical power source to the motor over the first cycle portion to thereby rotate the output member, wherein transmission of electrical power to the motor is interrupted after the first cycle portion;
- determining a parameter related to a rotational speed of the output member;
- operating the driving tool to transmit power from the output member to the driver to advance the driver after the first cycle portion is complete;
- and
- decreasing the time interval of the first cycle portion after electrical power to the motor has been interrupted after the first cycle portion if a magnitude of the parameter is greater than a predetermined threshold.
4 more elements
A method comprising:
- providing a driving tool having a driver, a motor assembly and an electrical power source, the driver being movable along an axis, the motor assembly including a motor and an output member, that is driven by the motor and employed to transmit power to the driver to thereby cause the driver to translate along the axis;
- and
- operating the driving tool over a complete cycle with a first cycle portion and at least one second cycle portion, the complete cycle including:
- transmitting electrical power from the electrical power source to the motor over the first cycle portion to thereby rotate the output member, wherein transmission of electrical power to the motor is interrupted after the first cycle portion;
- determining a first parameter, the first parameter being related to the back electromotive force that is generated by the motor without providing electrical power to the motor;
- adjusting a time interval of the first cycle portion after electrical power to the motor has been interrupted after the first cycle portion if a magnitude of the parameter is less than a predetermined first threshold or greater than a predetermined second threshold;
- transmitting electrical power from the electrical power source to the motor over a first one of the second cycle portions to thereby rotate the output member;
- re-determining the first parameter after completion of the first one of the second cycle portions;
- determining an apparent voltage of a next one of the second cycle portions based at least partially on a magnitude of the first parameter;
- and
- operating the driving tool to transmit power from the output member to the driver to advance the driver after the first cycle portion is complete.
8 more elements
Dependencies are inferred from the claim text.