US 11,440,166 B2 · Impact tool and method of controlling impact tool

Abstract

An impact tool and method can include: a motor; a trigger; a controller configured to control driving power supplied to the motor using a semiconductor switching element according to an operation of the trigger; a striking mechanism configured to drive a tip tool continuously or intermittently by rotation force of the motor, the striking mechanism including a hammer and an anvil. The controller drives the semiconductor switching element at a high duty ratio when the trigger is manipulated. The motor can be driven so that the duty ratio is lowered before a first striking of the hammer on the anvil is performed and the first striking is performed at a low duty ratio lower than the high duty ratio.

Claims16

Dependent claims

An impact tool comprising:

a motor as a driving source;
an output shaft;
a rotary striking mechanism driven by the motor;
a switch trigger configured to be operated;
and
an operation unit configured to control a voltage applied to the motor,
wherein the operation unit is configured to:
apply a first voltage to the motor after the switch trigger is manipulated;
lower the voltage after applying the first voltage to the motor and before the rotary striking mechanism transmits a first striking force to the output shaft from the switch trigger is operated;
and
keep the voltage lower than the first voltage while the rotary striking mechanism transmits a plurality of subsequent striking forces to the output shaft.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/792,253Filed 16 Feb 2020 · continuation

Priority

JP 2012-28036322 Dec 2012

Published

US 2020/0180125 A111 Jun 2020

Granted

13 Sep 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

B25B 21/02
Portable power-driven screw or nut setting or loosening tools; ; Attachments for drilling apparatus serving the same purpose: with means for…
B25B 21/026
With means for imparting impact to screwdriver blade or nut socket: impact clutches
B25B 23/1475
Specially adapted for electrically operated wrenches or screwdrivers: for impact wrenches or screwdrivers
B25B
Tools or bench devices not otherwise provided for, for fastening, connecting, disengaging

Family

PCT/JP2013/084773Parent of this continuation · filed 18 Dec 2013

US 2020/0180125 A1Pre-grant publication · published 11 Jun 2020

Application14/653,074Parent of this continuation

US 10,562,160 B2Parent of this continuation

US 2015/0336249 A1Published application

US 11,440,166 B2This patent

From the US filing history. Foreign family members aren’t listed.

Impact tool and method of controlling impact tool

Life of this patent

Impact tool and method of controlling impact tool

Life of this patent

Abstract

Claims16