Cordless power tool

Details Cordless power tool Cordless power tool

2007-07-24

2007-07-24

Easthom, Karl (Department: 2838)

Electricity: battery or capacitor charging or discharging

Cell or battery charger structure

For handheld device

C320S112000

Reexamination Certificate

active

10538010

ABSTRACT:
A cordless power tool such as a power staple gun1includes a power supply circuit of an electric double layer capacitor8and a lithium-ion battery11. In a standby state, the lithium-ion battery charges the electric double layer capacitor, and at a switch on time, the electric double layer capacitor supplies large current to the motor5. By combining the lithium-ion battery with high energy density and the electric double layer capacitor capable of discharging large current, it is possible to greatly reduce the size and weight as compared with a case where a nickel-cadmium battery or a nickel-hydrogen battery is used. Besides, since the electric double layer capacitor has a very long lifetime, the running cost can also be reduced.

REFERENCES:
patent: 5831420 (1998-11-01), Myers
patent: 6016049 (2000-01-01), Baughman et al.
patent: 6373152 (2002-04-01), Wang et al.
patent: 6525511 (2003-02-01), Kubale et al.
patent: 6-679-4 (1994-01-01), None
patent: 9-285006 (1997-10-01), None
patent: 10-29172 (1998-02-01), None
patent: 2002-142375 (2002-05-01), None
Machine translation of JP-09285006.
Machine translation of JP-2002142375.

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