Electric tool

Patent metadata

Field	Value
Publication number	US-9630310-B2
Application number	US-201514807291-A
Country	US
Kind code	B2
Filing date	Jul 23, 2015
Priority date	Feb 1, 2013
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

An electric tool, such as an angle driver, has a main tool body with a front portion and a rear portion positioned opposite to the front portion. The main tool body houses a motor configured to receive electricity to function as a drive source. A gear head is coupled with the front portion of the main tool body wherein the gear head has a spindle in communication with a motor axis of the motor via mesh-engagement of bevel gears associated with the motor axis. The spindle has with a cutter tool accessory attached thereto such that rotation of the motor axis produces a commensurate rotation of the cutter tool accessory. Battery attachment portions are associated with the rear portion of the main tool body and are configured to receive a corresponding set of batteries that provide electricity to power the motor.

First claim

What is claimed is:

1. An electric tool comprising:
a main tool body with a front portion and a rear portion positioned opposite to the front portion wherein the main tool body houses a motor configured to receive electricity to be driven;
a gear head coupled with the front portion of the main tool body wherein the gear head has a spindle in communication with a motor axis of the motor via mesh-engagement of bevel gears associated with the motor axis wherein the spindle has a cutter tool accessory attached thereto and further wherein rotation of the motor axis produces a commensurate rotation of the cutter tool accessory;
a plurality of battery attachment portions associated with the rear portion of the main tool body wherein the plurality of battery attachment portions is configured to receive a corresponding set of batteries which provide electricity to power the motor;
a support protrusion integrally formed with the main tool body to extend outwardly from the main tool body; and
a leg associated with the rear portion of the electric tool wherein the leg is tiltably connected to the support protrusion such that the leg tilts to be positioned at an angle relative to the main tool body.

2. The electric tool of claim 1 wherein the cutter tool accessory is configured rotate around a spindle axis positioned orthogonal to the motor axis of the motor.

3. The electric tool of claim 1 wherein the plurality of battery attachment portions includes two battery attachment portions.

4. The electric tool of claim 1 wherein the plurality of battery attachment portions is configured such that a battery of the corresponding set of batteries can be attached in a longitudinal state in which a longitudinal direction of each of the batteries extends vertically parallel to an axis of the spindle.

5. The electric tool of claim 4 wherein the plurality of battery attachment portions is configured so that the batteries can be attached to be arranged horizontally side-by-side relative to the motor axis.

6. The electric tool of claim 1 wherein the plurality of battery attachment portions is configured such that the corresponding set of batteries can be attached to and detached from the plurality of battery attachment portions by sliding the batteries in a vertical direction parallel to an axis of the spindle.

7. The electric tool of claim 1 wherein the plurality of battery attachment portions is configured such that the corresponding set of batteries can be attached to the plurality of battery attachment portions, wherein attachment surfaces of the battery attachment portions are positioned to face each other.

8. The electric tool of claim 1 wherein the motor is configured to be powered by electricity having a voltage rating of 36V.

9. The electric tool of claim 1 wherein each battery of the corresponding set of batteries is connected in a series to provide a total system voltage calculated as the sum of the voltage ratings of each battery of the corresponding set of batteries.

10. The electric tool of claim 1 , further comprising:
a controller board C configured to control the electric tool wherein the controller board C is integrated with a power circuit of the motor.

11. The electric tool of claim 10 , further comprising:
a microprocessor associated with the controller board C wherein the microprocessor assists in controlling the electric tool, and
a switching element configured to switch between circuitry associated with the controller board C.

12. The electric tool of claim 1 , further comprising:
a support protrusion integrally formed with the main tool body to extend outwardly from the main tool body.

13. The electric tool of claim 1 , further comprising:
a plurality of connection edges integrally formed at a front end of the leg portion such that the connection edges are parallel to each other to generally form a forked pattern,
wherein the support protrusion is inserted between the connection edges to couple the leg to the main tool body.

14. The electric tool of claim 13 wherein the support protrusion is connected to allow rotation of the leg relative to the main tool body by a connection shaft portion provided between the connection edges.

15. The electric tool of claim 14 wherein the leg portion is connected to the rear portion of the main tool body to be tiltable in a vertical direction.

16. The electric tool of claim 12 , further comprising:
a plurality of steel balls retained on side surfaces of the support protrusion such that the plurality of steel balls are retained on the same circular region while being mutually deviated from each other by 180 degrees.

17. The electric tool of claim 13 , further comprising:
a plurality of engagement plates wherein each engagement plate of the plurality of engagement plates is superimposed on surfaces of the support protrusion such that the plurality of engagement plates are fixed to the plurality of connection edges.

18. The electric tool of claim 17 , further comprising:
a plurality of holes positioned in each engagement plate of the plurality of engagement plates wherein a plurality of steel balls on the support protrusion are fitted into the plurality of holes.

19. The electric tool of claim 1 , wherein the leg portion is positioned straight with respect to the main tool body.

20. An electric tool, comprising:
first and second battery attachment portions where each battery attachment portion of the first and second battery attachment portions is configured to receive and connect to a rechargeable battery wherein the rechargeable battery connects with the each battery attachment portion by sliding;
an electric motor in communication with a motor shaft wherein the electric motor receives power supplied from the rechargeable batteries to rotate the motor shaft;
a tool accessory retaining portion driven by the motor shaft; and
a housing with a handle portion formed on a surface of the housing wherein the surface extends length-wise along the motor shaft, wherein
the electric motor is disposed between the first battery attachment portion and the second battery attachment portion,
the first and second battery attachment portions are arranged on the housing in symmetry with respect to an axis of the motor shaft,
the first battery attachment portion is configured so that a first rechargeable battery is slidably attached to the first battery attachment portion from above the first battery attachment portion, and
the second battery attachment portion is configured so that a second rechargeable battery is slidably attached to the second battery attachment portion from above the second battery attachment portion.

21. The electric tool of claim 20 , wherein:
the first battery attachment portion is configured so that a first rechargeable battery is slidably attached to the first battery attachment portion,
the first rechargeable battery includes a first connection terminal arrangement surface,
the second battery attachment portion is configured so that a second rechargeable battery is slidably attached to the second battery attachment portion,
the second rechargeable battery includes a second connection terminal arrangement surface, and
the first and second battery attachment portions are arranged such that the first connection terminal arrangement surface and the second connection terminal arrangement surface face toward each other.

22. An electric tool, comprising:
first and second battery attachment portions whe

Assignees

• Makita Corp

Inventors

• Ito Miyabi
• Kumagai Ryunosuke
• Sugiura Shin
• Mizutani Akira
• Kawakami Takahiro

Classifications

• H02J7/855

  with circuits adapted for supplying loads from the battery · CPC title

• H02J7/751

  concerning the insertion or the connection of the batteries · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• B24B23/02

  with rotating grinding tools; Accessories therefor · CPC title

• H02J7/0045

  Electricity · mapped topic