Method for switching off a power tool
First Claim
1. A method for shutting off a drive motor (12) of a power tool that drives a tool, the drive motor (12) being shut off as a function of a variable threshold value (E1) if the tool jams, wherein the threshold value (E1) is determined in at least one predetermined time interval (T1) as a function of a current load speed (n1) and a no-load speed (n0), wherein a current load speed (n1) is compared with a numerical interval listed in a table—
- the numerical interval relating to either a load speed or a no-load speed—
and is assigned to the new threshold value (E1), and wherein, at low load speeds (n1), the threshold value (E1) is lowered as a function of a selectable factor.
1 Assignment
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Accused Products
Abstract
In a method for shutting off a drive motor (12) of a power tool that drives a tool, the drive motor (12) is shut off as a function of a variable threshold value (E1) if the tool jams. The threshold value (E1) is determined in at least one predetermined time interval (T1) as a function of a current load speed (n1) and a no-load speed (n0).
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Citations
9 Claims
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1. A method for shutting off a drive motor (12) of a power tool that drives a tool, the drive motor (12) being shut off as a function of a variable threshold value (E1) if the tool jams, wherein the threshold value (E1) is determined in at least one predetermined time interval (T1) as a function of a current load speed (n1) and a no-load speed (n0), wherein a current load speed (n1) is compared with a numerical interval listed in a table—
- the numerical interval relating to either a load speed or a no-load speed—
and is assigned to the new threshold value (E1), and wherein, at low load speeds (n1), the threshold value (E1) is lowered as a function of a selectable factor. - View Dependent Claims (2, 3, 4, 5, 6)
- the numerical interval relating to either a load speed or a no-load speed—
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7. A method for shutting off a drive motor (12) of a power tool that drives a tool, the drive motor (12) being shut off as a function of a variable threshold value (E1) if the tool jams wherein the threshold value (E1) is determined in at least one predetermined time interval (T1) as a function of a current load speed (n1) and a no-load speed (n0), wherein rotational speed pulses (J1, J2) are counted in two consecutive first and second time intervals (T1, T2) and are subsequently used to determine the speeds (n1 n2), the rotational speed (n2) determined in the second time interval (T2) being subtracted from the rotational speed (n1) determined in the first time interval (T1) and, if the difference (n1-n2) is greater than the threshold value (E1), the drive motor (12) is shut off.
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8. A power tool with a tool that is drivable by a drive motor, comprising:
means for shutting off the drive motor (12) as a function of a variable threshold value (E1) if the tool is jammed, wherein the threshold value (E1) is determined in at least one predetermined time interval (T1) as a function of a current load speed (n1) and a no-load speed (n0), wherein a current load speed (n1) is compared with a numerical interval listed in a table—
the numerical interval relating to either a load speed or a no-load speed—
and is assigned to the new threshold value (E1), and wherein_at low load speeds(n1), the threshold value (E1) is lowered as a function of a selectable factor.
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9. A power tool with a tool that is drivable by a drive motor, comprising:
means for shutting off the drive motor (12) as a function of a variable threshold value (E1) if the tool is jammed, wherein the threshold value (E1) is determined in at least one predetermined time interval (T1) as a function of a current load speed (n1) and a no-load speed (n0), wherein rotational speed pulses (j1, J2) are counted in two consecutive first and second time intervals (T1, T2) and are subsequently used to determine the speeds (n1 n2), the rotational speed (n2) determined in the second time interval (T2) being subtracted from the rotational speed (n1) determined in the first time interval (T1) and, if the difference (n1-n2) is greater than the threshold value (E1), the drive motor (12) is shutoff.
Specification