US 10,987,792 B2Granted

Impact tool

AssigneeMakita Corporation

InventorsKiyonobu Yoshikane, Yoshiro Tada, Mizuki Yamamoto

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Abstract

An impact tool includes a tubular tool holder, a hammering mechanism, a resistor, and a biasing member. An impact element moves forward and rearward in conjunction with a piston. An intermediate element is housed movable back and forth between the impact element and a tip tool. The intermediate element abuts on a rear end of the tip tool to indirectly transmit a striking force from the impact element to the tip tool in a normal striking. The resistor is configured to abut on at least one of the intermediate element and the tip tool to apply a resistance to a front-rear movement of at least one of the intermediate element and the tip tool in a non-striking state. The biasing member disposed on the tool holder biases the resistor to a side of at least one of the intermediate element and the tip tool.

Claims20

Dependent claims

An impact tool comprising:

a tool holder that is configured to hold a tip tool;
a striking mechanism inside the tool holder, the striking mechanism including:
a piston that is configured to move forward and rearward relative to the tool holder in accordance with rotation from a motor;
an impact element that is configured to move forward and rearward in conjunction with the piston;
and
an intermediate element that is configured to (1) move back and forth between the impact element and the tip tool and (2) abut a rear end of the tip tool to indirectly transmit a striking force from the impact element to the tip tool in a normal striking;
a resistor that is configured to abut at least one of the intermediate element and the tip tool to apply a resistance to a front to rear movement of the at least one of the intermediate element and the tip tool in a non-striking state;
and
a biasing member that is configured to bias the resistor toward the at least one of the intermediate element and the tip tool at all times.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/289,004Filed 28 Feb 2019
Priority: JP JP2018-07631111 Apr 2018
Published: US 2019/0314971 A117 Oct 2019
Granted: 27 Apr 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

B25D 11/005
Portable percussive tools with electromotor or other motor drive: arrangements for adjusting the stroke of the impulse member or for stopping the…
B25D 17/24
Details of, or accessories for, portable power-driven percussive tools: damping the reaction force
B25D 11/04
Portable percussive tools with electromotor or other motor drive: in which the tool bit or anvil is hit by an impulse member
B25D 11/064
Means for driving the impulse member: using an electromagnetic drive