Battery voltage drop alarm device for a battery forklift truck
First Claim
1. In a battery forklift truck having an auxiliary movement apparatus, a battery voltage drop alarm device for alarming the necessity of charging a battery by detecting that the battery voltage drops to less than a prescribed value, comprising:
- (a) battery voltage drop detecting means for generating an alarm instruction signal by detecting that the voltage of said battery drops to less than a prescribed voltage value;
(b) alarm means for generating an alarm signal according to the alarm instruction signal generated from said battery voltage drop detecting means; and
(c) alarm cut off means connected to an auxiliary work switching means for supplying an electric power from the battery to the auxiliary movement apparatus and also connected to said alarm means, said alarm cut off means being provided for stopping the alarm operation of said alarm means when the auxiliary work switching means supplies the electric power to the auxiliary movement apparatus.
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Accused Products
Abstract
A battery voltage drop alarm circuit comprises a battery voltage drop detecting circuit, an alarm circuit, and an alarm cut off circuit. The battery voltage drop detecting circuit outputs an alarm instruction signal to the alarm circuit when the battery voltage drops to less than a predetermined value, then the alarm circuit generates an alarm sound. The alarm cut off circuit generates an alarm operation cut off signal to the alarm circuit to cut off the alarm operation thereof when the battery forklift performs the auxiliary work.
14 Citations
9 Claims
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1. In a battery forklift truck having an auxiliary movement apparatus, a battery voltage drop alarm device for alarming the necessity of charging a battery by detecting that the battery voltage drops to less than a prescribed value, comprising:
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(a) battery voltage drop detecting means for generating an alarm instruction signal by detecting that the voltage of said battery drops to less than a prescribed voltage value; (b) alarm means for generating an alarm signal according to the alarm instruction signal generated from said battery voltage drop detecting means; and (c) alarm cut off means connected to an auxiliary work switching means for supplying an electric power from the battery to the auxiliary movement apparatus and also connected to said alarm means, said alarm cut off means being provided for stopping the alarm operation of said alarm means when the auxiliary work switching means supplies the electric power to the auxiliary movement apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A battery voltage drop alarm device for a battery forklift truck, comprising:
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(a) a voltage drop detecting circuit for detecting the voltage drop of the battery; (b) an alarm instruction circuit for generating an alarm instruction signal when the detected voltage is less than a predetermined level; (c) a timer circuit which supplies an output signal for a predetermined time period when the alarm instruction signal is supplied from said alarm instruction circuit; (d) an alarm generating circuit for generating an alarm sound for a predetermined time period when the output signal is supplied from said timer circuit; (e) an auxiliary work switching circuit for supplying an electric power from the battery to an auxiliary movement apparatus circuit; and (f) an alarm cut off circuit connected to said auxiliary work switching circuit and also to said timer circuit and for resetting said timer circuit when said auxiliary work switching circuit supplies the electric power to the auxiliary movement apparatus circuit, whereby the output signal is not supplied to said alarm generating circuit.
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Specification