Cordless dual-battery electric tool

Details Cordless dual-battery electric tool Cordless dual-battery electric tool

1989-12-01

1991-07-02

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 13, 320 17, 320 48, H02J 700, H01M 1046

Patent

active

050288580

ABSTRACT:
A cordless electrical tool has a housing forming a pair of battery mounts, an electrical motor in the housing, respective batteries removably carried in the mounts, and circuitry connecting the batteries in series with each other and across the motor. A cutoff switch is connected in series between the batteries and the motor and can open to electrically disconnect the motor from the batteries. Respective control circuits detect the charge levels of the batteries and open the cutoff switch when the respective charge level drops below a predetermined threshold. Respective light-emitting diodes are provided to indicate which of the batteries is below its permissible charge.

REFERENCES:
patent: 3973179 (1976-08-01), Weber et al.
patent: 3999110 (1976-12-01), Ramstrom et al.
patent: 4150302 (1979-04-01), Roche
patent: 4229688 (1980-10-01), Knox et al.
patent: 4622508 (1986-11-01), Matteau et al.
patent: 4871956 (1989-10-01), Barrella

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