Handleable working device, in particular pressing device
First Claim
1. A handleable working device, comprising:
- a pressing device (1) having a pressing tool (23, 14);
an electric motor (31) operatively associated with said pressing device for driving the tool (12, 13);
a battery (34) operatively associated with said electric motor for supplying energy to said electric motor (31); and
a control device operatively associated with said electric motor and with said battery, said control device includes a voltage comparison element (39) comparing the voltage of said battery with a limit voltage (55, 58, 61), said control device generating an attention signal and/or limiting activation of said electric motor (31) if the voltage comparison element establishes that the battery voltage is equal to or less than the limit voltage (55, 58, 61), and said control device further includes an interval element (47) having at least one storable interval (t0) and a load element (31, 51), so that a voltage curve (53, 54, 56, 57, 59) with a varying battery voltage is generated during a load cycle, said interval element (47) being activated, during a predetermined interval in which the battery voltage is decreasing, at least once after said load element (31, 51) is activated so that the voltage comparison element may determine whether the battery voltage during the predetermined interval at least attains the limit voltage.
1 Assignment
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Accused Products
Abstract
A pressing device includes a pressing tool, an electric motor for driving the tool, and a rechargeable battery for supplying energy to the electric motor. A control device has a voltage comparison element that performs a voltage comparison between the battery voltage and a limit voltage. The control device generates an attention signal and/or limits activation of the electric motor if the voltage comparison element indicates that the battery voltage is equal to or less than the limit voltage. The control device includes an interval element with at least one storable interval. A load element acts upon the battery so that it generates a varying voltage curve. The interval element is activated when the load element is on and voltage comparison is made during a predetermined interval.
6 Citations
25 Claims
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1. A handleable working device, comprising:
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a pressing device (1) having a pressing tool (23, 14);
an electric motor (31) operatively associated with said pressing device for driving the tool (12, 13);
a battery (34) operatively associated with said electric motor for supplying energy to said electric motor (31); and
a control device operatively associated with said electric motor and with said battery, said control device includes a voltage comparison element (39) comparing the voltage of said battery with a limit voltage (55, 58, 61), said control device generating an attention signal and/or limiting activation of said electric motor (31) if the voltage comparison element establishes that the battery voltage is equal to or less than the limit voltage (55, 58, 61), and said control device further includes an interval element (47) having at least one storable interval (t0) and a load element (31, 51), so that a voltage curve (53, 54, 56, 57, 59) with a varying battery voltage is generated during a load cycle, said interval element (47) being activated, during a predetermined interval in which the battery voltage is decreasing, at least once after said load element (31, 51) is activated so that the voltage comparison element may determine whether the battery voltage during the predetermined interval at least attains the limit voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for determining the charge state of a battery operated pressing device, comprising the steps of:
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a) providing a handleable working device comprising a pressing device and an electric motor operably associated with the pressing device for operating the pressing device, and a battery operably associated with the electric motor for supplying energy to the electric motor for operating the electric motor;
b) providing a control device in operable association with the battery and the electric motor, the control device having a voltage comparison element for comparing the voltage of the battery to a limit voltage;
c) applying a load to the battery and thereby causing the voltage generated by the battery to vary;
d) comparing with the voltage comparison element the voltage of the battery with the limit voltage during a predetermined interval in which the load is applied; and
e) generating an attention signal or limiting actuation of the electric motor if the battery voltage does not at least achieve the limit voltage during the predetermined interval and allowing the electric motor to operate and thereby operating the pressing device if the battery voltage at least achieves the limit voltage during the predetermined interval.
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Specification