Charger for hand-held power tool, power tool system and method of charging a power tool battery

• US 9,577,450 B2
• Filed: 07/19/2012
• Issued: 02/21/2017
• Est. Priority Date: 07/24/2011
• Status: Active Grant

• Current Assignee: Makita Corporation
• Original Assignee: Makita Corporation
• Inventors: Yoshikawa, Shuji, Nagahama, Tatsuya, Furui, Nobuyasu, Suzuki, Hitoshi, Fukumoto, Masaaki, Umemura, Takuya, Ito, Kosuke
• Primary Examiner(s): Do, Thuan
• Application Number:
  US14/233,804
• Publication Number:
  US 20140159640A1
• Time in Patent Office: 1,678 Days
• Field of Search: 320/103
• US Class Current: 1/1
• CPC Class Codes: A41F 9/002 Free belts
• CPC Class Codes: A45F 2003/142 Carrying-straps
• CPC Class Codes: A45F 2003/144 Pack-carrying waist or torso belts
• CPC Class Codes: A45F 2003/146 Pack-carrying harnesses
• CPC Class Codes: A45F 3/14 Carrying-straps; Pack-carrying harnesses
• CPC Class Codes: B25F 5/02 Construction of casings, bodies or handles B25F5/006, B25F5/008 take precedence
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H02J 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034

Abstract

A charger for a hand-held power tool includes a power source interface, a charger base and a charging cradle rotatably supported on the charger base. The rotatable charging cradle includes at least two charging output terminals electrically connected to the power source interface. A power tool system includes the charger and the hand-held power tool. A method of charging the power tool system includes contacting charging input terminals of the power tool with the charging output terminals, rotating the charging cradle and the power tool relative to the charging base and supplying charging current to at least one battery cell while the charging cradle and the power tool are allowed to freely swing relative to the charging base.

Claims

1. A charger for a hand-held power tool, comprising:

a power source interface,

a charger base,

a charging cradle rotatably supported on the charger base, the rotatable charging cradle including at least two charging output terminals electrically connected to the power source interface, and

at least one guide disposed on the charger base and configured to guide charging input terminals of the hand-held power tool towards the charging cradle.

2. The charger according to claim 1, further comprising:

at least one battery cell electrically connected to the power source interface and configured to supply a charging current to the charging output terminals.

3. The charger according to claim 2, wherein the at least one battery cell is disposed in a charger battery pack having terminals configured or adapted to be electrically connectable with, and electrically disconnectable from, corresponding terminals of the power source interface, the charger battery pack being configured to output a voltage between 10-40 volts.

4. The charger according to claim 3, wherein the charger battery pack is configured to output a charging current of at least 0.7 amps.

5. The charger according to claim 1, further comprising:

means for detachably attaching the power source interface and the charger base to a user'"'"'s body.

6. The charger according to claim 5, wherein the means for attaching comprises at least one hook.

7. The charger according to claim 1, wherein the rotatable charging cradle is configured such that the charging output terminals are exposed by rotation of the charging cradle relative to the charger base away from a first rotational position.

8. The charger according to claim 7, further comprising a movable cover configured to cover the charging output terminals when the charging cradle is at the first rotational position and to uncover the charging output terminals when the charging cradle is rotated away from the first rotational position.

9. The charger according to claim 8, wherein the movable cover is slidable relative to the charging cradle between a first location that covers the charging output terminals and a second location that uncovers the charging output terminals.

10. The charger according to claim 1, further comprising means for wiping the surfaces of the charging output terminals when the charging cradle is rotated away from a first rotational position.

11. The charger according to claim 1, wherein the charging cradle is pivotable by at least 90°

relative to the charger base, but less than 180°

.

12. The charger according to claim 1, wherein the charging cradle is configured such that the hand-held power tool is freely pivotable relative to the charger base when the hand-held power tool is electrically connected to the charging cradle.

19. A power tool system comprising:

the charger according to claim 1, and

a hand-held power tool comprising;

charging input terminals configured to electrically connect to the charging output terminals and

at least one battery cell electrically connected with the charging input terminals.

20. The power tool system according to claim 19, wherein the charger battery pack is configured to store sufficient energy to fully recharge the at least one battery cell of the hand-held power tool at least one time.

21. The power tool system according to claim 19, wherein the power tool further comprises a charging adapter that includes the charging input terminals, the charging adapter being configured to conduct the charging current between the charger and the at least one battery cell.

22. The power tool system according to claim 19, wherein the charging adapter is detachably attached to the power tool.

23. The power tool system according to claim 19, wherein the at least one battery cell is disposed in a power tool battery pack that is physically attachable to and detachable from a housing of the power tool.

24. The power tool system according to claim 23, wherein the charging adapter is configured to be physically attached to the power tool housing and/or to the power tool battery pack.

25. The power tool system according to claim 23, wherein the charging adapter is configured to be physically engaged with only the power tool housing, but the charging adapter may optionally contact the power tool battery pack when engaged with the power tool housing.

26. The power tool system according to claim 23, wherein the power tool battery pack is chargeable while the power tool battery pack is connected to the power tool housing.

27. The power tool system according to claim 23, wherein the power tool battery pack is configured to output a voltage between 10-40 volts.

28. The power tool system according to claim 19, wherein the power tool is an electric driver drill, an electric hammer driver drill, an electric impact driver, an electric impact wrench, an electric screwdriver or an electric grinder.

29. A method of charging the power tool system of claim 19, comprising:

contacting the charging input terminals of the power tool with the charging output terminals of the charger,

rotating the charging cradle and the power tool relative to the charging base while the charging input terminals contact the charging output terminals, and

supplying charging current to the at least one battery cell while the at least one battery cell is connected to the power tool and while the charging cradle and the power tool are allowed to freely swing relative to the charging base.

13. A charger for a hand-held power tool, comprising:

a power source interface,

a charger base,

a charging cradle rotatably supported on the charger base, the rotatable charging cradle including at least two charging output terminals electrically connected to the power source interface, and

means for detachably attaching the power source interface and the charger base to a user'"'"'s body,

wherein the means for attaching comprises a belt configured to be worn on the user'"'"'s body.

14. A charger for a hand-held power tool, comprising:

a power source interface,

a charger base,

a charging cradle rotatably supported on the charger base, the rotatable charging cradle including at least two charging output terminals electrically connected to the power source interface, and

an urging member configured to urge the charging cradle towards a first rotational position, at which charging input terminals of the hand-held power tool, or of an optional charging adapter that is physically and electrically connected to the hand-held power tool, are attachable to the rotatable charging cradle.

15. A charger for a hand-held power tool, comprising:

a power source interface,

a charger base,

a charging cradle rotatably supported on the charger base, the rotatable charging cradle including at least two charging output terminals electrically connected to the power source interface, and

a first lock mechanism configured to prevent the hand-held power tool from being detached from the charging cradle when the charging cradle is not disposed at a first rotational position, the hand-held power tool being detachable from the charging cradle at the first rotational position.

16. The charger according to claim 15, further comprising a second lock mechanism configured to prevent the charging cradle from rotating away from the first rotational position when the hand-held power tool is not mounted on the charging cradle, wherein the second lock mechanism is configured to be released by insertion of a portion of the hand-held power tool into or around the charging cradle.

17. A charger for a hand-held power tool, comprising:

a power source interface,

a charger base,

a charging cradle rotatably supported on the charger base, the rotatable charging cradle including at least two charging output terminals electrically connected to the power source interface, and

a charging controller attached to the charger base, the charging controller being configured to control the voltage and/or the current of the charging current supplied to the charging output terminals.

18. A charger for a hand-held power tool, comprising:

a power source interface,

a charger base and

a charging cradle rotatably supported on the charger base, the rotatable charging cradle including at least two charging output terminals electrically connected to the power source interface,

wherein the charging cradle is rotatably supported by a shaft that is fixedly attached to the charger base.

30. A charger for a hand-held power tool, comprising:

a battery pack interface,

a charger main body and

rotatable holding means for holding the hand-held power tool, the rotatable holding means being rotatably supported on the charger main body and including at least two charging output terminals electrically connected to the battery pack interface.

31. The charger according to claim 30, further comprising:

a belt configured to be worn around a user'"'"'s waist, the battery pack interface and the charger main body being attached to the belt.