Electric operating machine

Patent metadata

Field	Value
Publication number	US-10547182-B2
Application number	US-201715429787-A
Country	US
Kind code	B2
Filing date	Feb 10, 2017
Priority date	Aug 28, 2009
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

When a main switch (12) is turned ON, an electric operating machine (1) is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.

First claim

The invention claimed is:

1. An electric operating machine comprising:
a battery mount mounting/dismounting a battery;
an electric motor that is driven by electric power supplied from the battery;
a trigger that allows or blocks the electric power supply to the electric motor from the battery based on a user input;
a control circuit that blocks the electric power supply to the electric motor from the battery based on detecting an abnormal condition in the battery; and
a switch circuit that receives a signal from the control circuit, the switch circuit allowing or blocking the electric power supply to the electric motor based on the received signal,
wherein the control circuit identifies a type of the battery mounted on the battery mount, and uses a value based on the identified type of the battery as a threshold value for determining that the battery is in the abnormal condition,
wherein, when the identified type is a first type, the control circuit sets a first threshold value for determining that the battery is in the abnormal condition, and when the identified type is a second type that is different from the first type, the control circuit sets a second threshold value that is different from the first threshold value for determining that the battery is in the abnormal condition, and
wherein when the abnormal condition is detected, the control circuit transmits the signal to the switch circuit such that the switch circuit blocks the electric power supply to the electric motor from the battery based on the signal even when the trigger allows the electric power supply to the electric motor from the battery based on the user input.

2. The electric operating machine according to claim 1 wherein the control circuit (i) sets a set voltage preventing an over discharge of the battery as the threshold value; and (ii) blocks the output from the battery when the voltage output from the battery becomes equal or lower than the set voltage.

3. The electric operating machine according to claim 2 ,
wherein the battery mount is capable of mounting/dismounting any one of batteries having different rated voltages,
the electric motor is capable of being driven by any one of the batteries, and
the control circuit identifies the rated voltage of the battery mounted on the battery mount, and uses a value based on the identified rated voltage as the set voltage.

4. The electric operating machine according to claim 3 ,
wherein the control circuit (i) sets a first voltage as the set voltage when the battery mounted on the battery mount has a first rated voltage or (ii) sets a second voltage higher than the first voltage when the battery mounted on the battery mount has a second rated voltage higher than the first rated voltage.

5. The electric operating machine according to claim 3 comprising a voltage converter converting the voltage input from the battery and outputting the converted voltage to the electric motor.

6. The electric operating machine according to claim 5 wherein the voltage converter transforms the voltage input from the battery and outputs the transformed voltage to the electric motor.

7. The electric operating machine according to claim 1 wherein the battery comprises a protection circuit (i) detecting an abnormal event of the battery, and (ii) causing the battery to stop outputting the current based on detecting the abnormal event of the battery independent from the determination by the control circuit.

8. The electric operating machine according to claim 7 , wherein,
when the abnormal event of the battery are detected by the protection circuit, the battery outputs an abnormal signal to the control circuit, and
the control circuit blocks the output from the battery based on the abnormal signal.

9. The electric operating machine according to claim 1 , wherein the control circuit identifies the type of the battery mounted on the battery mount based on battery information output by the battery.

10. The electric operating machine according to claim 8 , wherein the control circuit sets the set voltage in reference to a preliminarily stored relationship between battery information and the set voltage.

11. The electric operating machine according to claim 1 , comprising an abnormal condition informer informing a worker that the output of the battery is stopped due to the abnormal condition, when the control circuit blocks the output from the battery based on determining that the battery is in the abnormal condition.

12. The electric operating machine according to claim 1 , wherein the control circuit blocks a current running through the electric motor when the current running through the electric motor exceeds a given amount.

13. The electric operating machine according to claim 1 , wherein the battery is a lithium ion battery.

Assignees

• Hitachi Koki Kk
• Koki Holdings Co Ltd

Inventors

• Takano Nobuhiro
• Funabashi Kazuhiko
• Tanimoto Hideyuki
• Yoshimizu Chikai
• Ozawa Hiromi
• Hoshi Yoshihiro

Classifications

• H02J7/64

  against overvoltage · CPC title

• H02J7/62

  against overcurrent · CPC title

• H02J7/855

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

• H02J7/663

  using battery or load disconnect circuits (H02J9/002 takes precedence) · CPC title

• H02J7/96

  in response to battery voltage · CPC title