Drilling Device

Patent metadata

Field	Value
Publication number	US-2016207187-A1
Application number	US-201414915388-A
Country	US
Kind code	A1
Filing date	Jul 25, 2014
Priority date	Aug 30, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

A drilling device capable of easily pulling an end bit out of a workpiece is provided. The drilling device is provided with a housing, a brushless motor, a motion translating mechanism, and an output portion. The motion translating mechanism includes a rotation transmitting portion. The rotation transmitting portion includes a bevel gear and clutch. The bevel gear has an abutment portion. The clutches has an abutted portion. Rotational play is formed between the abutment portion and the abutted portion.

First claim

1 . A drilling device comprising:
a housing; a motor provided in the housing and rotatable in forward direction and reverse direction, the forward rotation and the reverse rotation being repeatedly performed in case of forward/reverse mode; and a rotary motion transmitting portion configured to transmit a rotational force of the motor to an end bit, the rotary motion transmitting portion comprising: a rotary member rotationally driven by the motor; an abutment portion provided at the rotary member and rotatable together with the rotary member; and an abutted portion rotationally driven upon abutment with the abutment portion during repetition of the forward rotation and the reverse rotation of the motor in the forward/reverse mode.

2 . The drilling device as claimed in claim 1 , wherein the abutment portion and the abutted portion are positioned away from each other in a circumferential direction of the rotary member in at least one of a first rotational direction of the rotary member when the motor is rotated in the forward direction and a second rotational direction of the rotary member when the motor is rotated in the reverse direction.

3 . The drilling device as claimed in claim 2 , wherein the rotary motion transmitting portion further comprises a deceleration portion configured to deceleratingly transmit rotation of the motor to the rotary member.

4 . The drilling device as claimed in claim 3 , further comprising a reciprocal motion translating portion configured to translate the rotational force of the motor into a reciprocal motion, and comprising:
a reciprocation member configured to impact the end bit; and a cylinder accommodating therein the reciprocation member, the rotary member and the abutted portion being positioned radially outward of the cylinder; wherein the abutted portion is movable in an axial direction of the cylinder, and is configured to transmit or shut-off the rotational force to the cylinder upon the axial movement.

5 . The drilling device as claimed in claim 4 , further comprising:
a trigger configured to turn on/off a power supply to the motor; a switch configured to change an operation mode to the forward /reverse mode; and a change-over dial configured to selectively provide one of an impact mode, a rotation mode, and an impact/rotation mode, in the impact mode only an impacting force being transmitted to the end bit by the reciprocal motion translating portion, in the rotation mode only a rotational force being transmitted to the end bit by the rotary motion transmitting portion, and in the impact/rotation mode the impacting force and the rotational force being transmitted to the end bit; wherein the motor is operated in the forward/reverse mode by manipulating the switch and pulling the trigger while the change-over dial is at the rotation mode.

6 . The drilling device as claimed in claim 4 , further comprising a change-over dial configured to selectively change an operation mode to one of an impact mode, a rotation mode, an impact/rotation mode, and a forward/reverse mode, in the impact mode only an impacting force being transmitted to the end bit by the reciprocal motion translating portion, in the rotation mode only a rotational force being transmitted to the end bit by the rotary motion transmitting portion, and in the impact/rotation mode the impacting force and the rotation force being transmitted to the end bit.

7 . The drilling device as claimed in claim 1 , wherein the housing includes a main body portion accommodating therein the motor and the rotary motion transmitting portion, and a handle portion movable relative to the main body portion; and the drilling device further comprising:
a detecting portion configured to detect movement of the handle portion; and a controller configured to set the operation mode to the forward/reverse mode in accordance with a result of detection by the detecting portion.

8 . The drilling device as claimed in claim 7 , wherein the detecting portion comprises a load sensor.

9 . The drilling device as claimed in claim 7 , wherein the detecting portion comprises a position sensor.

10 . The drilling device as claimed in claim 1 , wherein the motor is a brushless motor.

Assignees

• Hitachi Koki Kk

Inventors

• Nishikawa Tomomasa
• Yoshimizu Chikai
• Takano Nobuhiro

Classifications

• B25D16/00 Primary

  Portable percussive machines with superimposed rotation {, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit (combined percussion and rotary drilling adapted for earth drilling E21B6/00)} · CPC title

• B25D16/006 Primary

  Mode changers; Mechanisms connected thereto · CPC title

• B25D2216/0015

  Tools having a percussion-only mode · CPC title

• B25D2216/0038

  Tools having a rotation-only mode · CPC title

• B25D2216/0084

  Mode-changing mechanisms · CPC title