Power tools
First Claim
1. A power tool adapted to tighten a fastener, comprising:
- a motor,means for generating an elevated torque, wherein the elevated torque generating means is coupled to the motor and has output shaft, wherein if a load acting on the output shaft is less than a predetermined value, rotating torque generated by the motor is directly transmitted to the output shaft and if a load acting on the output shaft exceeds the predetermined value, an elevated torque is generated by the elevated torque generating means and applied to the output shaft,a load shaft connected to the output shaft,means for detecting change in rotational angle of either the output shaft or the load shaft and the direction of rotation thereof,a memory for storing a state of either output shaft or the load shaft detected by the detecting means, anda processor in communication with the motor, the detecting means and the memory, the detecting means communicating signals corresponding to the state of either the output shaft or the load shaft to the processor, wherein the processor stores the state of either the output shaft or the load shaft in the memory at predetermined interval, and wherein the processor determines, based upon the stored state of either the output shaft or the load shaft, when the elevated torque generating means generates the elevated torque.
1 Assignment
0 Petitions
Accused Products
Abstract
Power tool (11) may include a motor and oil pulse unit (22) that generates an elevated torque. Oil pulse unit (22) may be coupled to the motor and have output shaft (18). When load acting on output shaft (18) is less than a predetermined value, rotating torque generated by the motor is directly transmitted to output shaft (18). When the load acting on output shaft (22) exceeds the predetermined value, an elevated torque is generated by oil pulse unit (22) and applied to output shaft (18). Output shaft (18) may be connected to load shaft (12). A socket may be attached to the distal end of load shaft (12). Power tool (11) may further include detecting device (20) for detecting change in rotational angle of output shaft (18) and the direction of rotation thereof, and a control device. The detecting device (20) may output signals corresponding to a state of output shaft (18) to the control device. The control device may store the state of output shaft (18) at predetermined interval. Preferably, the control device may further determine a generating time, at which oil pulse unit (22) generates the elevated torque, based upon the state of output shaft (18).
933 Citations
18 Claims
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1. A power tool adapted to tighten a fastener, comprising:
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a motor, means for generating an elevated torque, wherein the elevated torque generating means is coupled to the motor and has output shaft, wherein if a load acting on the output shaft is less than a predetermined value, rotating torque generated by the motor is directly transmitted to the output shaft and if a load acting on the output shaft exceeds the predetermined value, an elevated torque is generated by the elevated torque generating means and applied to the output shaft, a load shaft connected to the output shaft, means for detecting change in rotational angle of either the output shaft or the load shaft and the direction of rotation thereof, a memory for storing a state of either output shaft or the load shaft detected by the detecting means, and a processor in communication with the motor, the detecting means and the memory, the detecting means communicating signals corresponding to the state of either the output shaft or the load shaft to the processor, wherein the processor stores the state of either the output shaft or the load shaft in the memory at predetermined interval, and wherein the processor determines, based upon the stored state of either the output shaft or the load shaft, when the elevated torque generating means generates the elevated torque. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power tool adapted to tighten a fastener, comprising:
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a motor, means for generating an elevated torque, wherein the elevated torque generating means is coupled to the motor and has output shaft, wherein if a load acting on the output shaft is less than a predetermined value, rotating torque generated by the motor is directly transmitted to the output shaft and if a load acting on the output shaft exceeds the predetermined value, an elevated torque is generated by the elevated torque generating means and applied to the output shaft, a load shaft connected to the output shaft, means for detecting change in rotational angle of either the output shaft or the load shaft and the direction of rotation thereof, a memory storing automatic stopping programs for automatically stopping the motor for each of differing types of workpiece, and a processor in communication with the motor, the detecting means and the memory, the detecting means communicating signals corresponding to the state of either the output shaft or the load shaft to the processor, wherein the processor (1) determining the type of workpiece based upon the signals from the detecting means, and (2) selecting the automatic stopping program based upon the determined type of workpiece, and (3) stopping the motor in accordance with the selected automatic stopping program. - View Dependent Claims (14, 15)
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16. A power tool adapted to tighten a fastener, comprising:
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a motor, means for generating an elevated torque, wherein the elevated torque generating means is coupled to the motor and has output shaft, wherein if a load acting on the output shaft is less than a predetermined value, rotating torque generated by the motor is directly transmitted to the output shaft and if a load acting on the output shaft exceeds the predetermined value, an elevated torque is generated by the elevated torque generating means and applied to the output shaft, wherein the means for generating an elevated torque comprises an oil pulse unit, a load shaft connected to the output shaft, means for detecting change in rotational angle of either the output shaft or the load shaft and the direction of rotation thereof, a memory for storing a state of either output shaft or the load shaft detected by the detecting means, and a processor in communication with the motor, the detecting means and the memory, the detecting means communicating signals correspond to the state of either the output shaft or the load shaft to the processor, wherein the processor stores the state of either the output shaft or the load shaft in the memory at predetermined interval, and wherein the processor determines a generating time, at which the means for generating an elevated torque generates the elevated torque, based upon the state of either the output shaft or the load shaft stored in the memory.
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17. A power tool adapted to tighten a fastener, comprising:
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a motor, means for generating an elevated torque, wherein the elevated torque generating means is coupled to the motor and has output shaft, wherein if a load acting on the output shaft is less than a predetermined value, rotating torque generated by the motor is directly transmitted to the output shaft and if a load acting on the output shaft exceeds the predetermined value, an elevated torque is generated by the elevated torque generating means and applied to the output shaft, a load shaft connected to the output shaft, means for detecting change in rotational angle of either the output shaft or the load shaft and the direction of rotation thereof, a memory for storing a state of either output shaft or the load shaft detected by the detecting means, and a processor in communication with the motor, the detecting means and the memory, the detecting means communicating signals correspond to the state of either the output shaft or the load shaft to the processor, wherein the processor stores the state of either the output shaft or the load shaft in the memory at predetermined interval, and wherein the processor determines a generating time, at which the means for generating an elevated torque generates the elevated torque, based upon the state of either the output shaft or the load shaft stored in the memory, wherein (1) at the time when change in the rotational angle of either the output shaft or the load shaft has occurred, the processor calculates the changes in the rotational angle of the output shaft or the load shaft in the tightening direction during a first predetermined period extending from a time prior to the change in the rotational angle until the change in the rotational angle occurs, (2) when the calculated changes in the rotational angle is within a first predetermined value, the processor further calculates the absolute value of the changes in the rotational angle of either the output shaft or the load shaft in a period lasting from the change in the rotational angle until a second predetermined period has elapsed, and (3) when the absolute value of the changes in the rotational angle is greater than a second predetermined value, the processor determines that the time of occurrence of the change in the rotational angle is the generating time. - View Dependent Claims (18)
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Specification