Power tool
First Claim
1. A power tool, comprising:
- a radar for transmitting radio waves towards an area in a vicinity of a rotating tool, and for receiving reflected radio waves reflected from a radio wave reflector existing within the area;
a means for calculating, from the reflected radio waves received by the radar, a distance between the radio wave reflector and the rotating tool, and a speed of change of the distance;
a first brake for applying gentle braking to the rotating tool when the calculated distance and speed fulfill a first criterion; and
a second brake for applying rapid braking to the rotating tool when the calculated distance and speed fulfill a second criterion.
1 Assignment
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Accused Products
Abstract
The power tool is equipped with a radar for transmitting radio waves towards an area in a vicinity of a rotating tool and for receiving reflected radio waves reflected from a radio wave reflector existing within the area. From the reflected radio waves received by the radar, a distance between the radio wave reflector and the radar, and a speed of change of that distance are calculated. When the calculated distance and speed fulfill a first criterion, a first brake for applying gentle braking to the rotating tool is activated. When the radio wave reflector further approaches to the rotating tool and the calculated distance and speed fulfill a second criterion, a second brake for applying rapid braking to the rotating tool is activated. Distance in the first criterion and the increase as speed increases, and distance corresponding to a certain speed in the first criterion is longer than distance corresponding to the same speed in the second criterion.
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Citations
8 Claims
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1. A power tool, comprising:
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a radar for transmitting radio waves towards an area in a vicinity of a rotating tool, and for receiving reflected radio waves reflected from a radio wave reflector existing within the area;
a means for calculating, from the reflected radio waves received by the radar, a distance between the radio wave reflector and the rotating tool, and a speed of change of the distance;
a first brake for applying gentle braking to the rotating tool when the calculated distance and speed fulfill a first criterion; and
a second brake for applying rapid braking to the rotating tool when the calculated distance and speed fulfill a second criterion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power tool, comprising:
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a motor for causing a rotating tool to rotate;
a clutch inserted between the rotating tool and the motor, the clutch being capable of switching the rotating tool and the motor between an engaged state and a disengaged state;
a radar for transmitting radio waves towards an area in a vicinity of the rotating tool and for receiving reflected radio waves reflected from a radio wave reflector existing within the area;
a means for calculating, from the reflected radio waves received by the radar, a distance between the radio wave reflector and the rotating tool, and a speed of change of the distance;
a clutch switching means for switching the clutch to the disengaged state when the calculated distance and speed fulfill a first criterion; and
a brake for applying braking force to the rotating tool when the calculated distance and speed fulfill a second criterion.
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Specification