Method and device to monitor the current of a battery-operated handheld power tool
First Claim
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1. A method to monitor the current of a handheld power tool operated by a battery, via at least one counter, comprising the following steps:
- a) measuring the electric current drawn from the battery during operation of the electric tool;
b) incrementing a reading of the counter by a certain increment whenever the measured current is higher than a specified upper limit value during a given counting interval;
c) decrementing the reading of the counter by a certain decrement whenever the measured current is lower than the specified upper limit value during the given counting interval; and
d) switching off the electric tool when the reading of the counter is higher than a specified limit value for the counter.
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Abstract
A method to monitor the current of a handheld power tool (3) operated by a battery (2), by at least one counter (5), includes the following steps:
- measuring (S1) the electric current (I) drawn from the battery during the operation of the electric tool;
- incrementing (S2) a reading (Z, Z1, Z2) of the counter (5) by a certain increment (IN) whenever the measured current (I) is higher than a specified upper limit value (G1, G2) during a given counting interval;
- decrementing (S3) the reading of the counter by a certain decrement (DE) whenever the measured current is lower than the specified upper limit value during the given counting interval; and
- switching off (S4) the electric tool when the reading (Z, Z1, Z2) of the counter is higher than a specified limit value (T1, T2) for the counter.
15 Citations
15 Claims
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1. A method to monitor the current of a handheld power tool operated by a battery, via at least one counter, comprising the following steps:
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a) measuring the electric current drawn from the battery during operation of the electric tool; b) incrementing a reading of the counter by a certain increment whenever the measured current is higher than a specified upper limit value during a given counting interval; c) decrementing the reading of the counter by a certain decrement whenever the measured current is lower than the specified upper limit value during the given counting interval; and d) switching off the electric tool when the reading of the counter is higher than a specified limit value for the counter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for monitoring the current of an electric tool operated by a battery, comprising the following:
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a measurer to measure the electric current drawn from the battery during the operation of the electric tool; at least one counter configured to increment its reading by a certain increment whenever the measured current is higher than a specified upper limit value during a given counting interval, and to decrement the reading by a certain decrement whenever the measured current is lower than the specified upper limit value during the given counting interval; and a contact-breaker to switch off the electric tool when the reading of the counter is higher than a specified limit value for the counter. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification