# US 2013/0075121 A1 · Impact tool

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- Number: US 2013/0075121 A1
- Document ID: US20130075121A1
- Status: Published application
- Kind: A1
- Application number: 13/574,747
- Filed: 2011-03-08
- Published: 2013-03-28
- Earliest claimed: 2010-03-08
- Assignees: Hitachi Koki Co., Ltd.
- Inventors: Mizuho Nakamura; Katsuhiro Oomori
- Web page: https://patentgrep.com/patent/US20130075121A1

## CPC

- B25B 21/02: with means for imparting impact to screwdriver blade or nut socket
- B25B 21/026: {Impact clutches}
- B25B 23/18: Devices for illuminating the head of the screw or the nut
- B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING

## Abstract

An impact tool including: a motor; a housing that accommodates the motor; a hammer rotated by the motor in a rotating direction; an anvil struck by the hammer in the rotating direction; an end tool holding portion connected to the anvil and protruding from a front part of the housing; and a load receiving portion that receives a load of the hammer in a rear direction.

## Claims

### Claim 1

An impact tool comprising:
a motor;
a housing that accommodates the motor;
a hammer rotated by the motor in a rotating direction;
an anvil struck by the hammer in the rotating direction;
an end tool holding portion connected to the anvil and protruding from a front part of the housing; and
a load receiving portion that receives a load of the hammer in a rear direction.

### Claim 2 (depends on 1)

The impact tool according to claim 1,
wherein the hammer is connected to the motor through a first speed reducing mechanism portion connected to the motor and a second speed reducing mechanism portion connected to an output part of the first speed reducing mechanism portion, and
wherein the load receiving portion receives a load of the second speed reducing mechanism portion in the rear direction.

### Claim 3 (depends on 2)

The impact tool according to claim 2,
wherein the first speed reducing mechanism portion and the second speed reducing mechanism portion each include a sun gear, a plurality of planetary gears and a ring gear,
wherein the hammer is connected to a planetary carrier of the second speed reducing mechanism portion, and
wherein the sun gear of the second speed reducing mechanism portion is connected to a planetary carrier of the first speed reducing mechanism portion.

### Claim 4 (depends on 3)

The impact tool according to claim 3,
wherein the planetary carrier of the second speed reducing mechanism portion includes a hammer portion and an annular portion, and
wherein the annular portion can rotate relatively to the ring gear of the second speed reducing mechanism portion.

### Claim 5 (depends on 4)

The impact tool according to claim 4,
wherein the load receiving portion includes the annular portion and the ring gear of the second speed reducing mechanism portion, and
wherein the load transmitted to the ring gear is transmitted to the housing.

### Claim 6 (depends on 5)

The impact tool according to claim 5,
wherein the load receiving portion includes a thrust bearing.

### Claim 7

An impact tool comprising:
a motor;
a housing that accommodates the motor;
an inner cover and a hammer case accommodated in the housing;
a hammer portion accommodated in a space defined by the inner cover and the hammer case and rotated by the motor in a rotating direction;
an anvil accommodated in the space defined by the inner cover and the hammer case and struck by the hammer in the rotating direction; and
an end tool holding portion protruding from a front part of the hammer case and connected to the anvil,
wherein a rear part of the hammer portion, in an axial direction of the hammer portion, is supported so as to freely rotate relative to the inner cover.

### Claim 8 (depends on 7)

The impact tool according to claim 7,
wherein a load receiving unit is provided in a rear side of the hammer portion so as to receive an axial load and freely rotate relative to the inner cover.

### Claim 9 (depends on 8)

The impact tool according to claim 8,
wherein the load receiving unit is a thrust bearing unit provided in the rear side of the hammer portion.

### Claim 10

An impact tool comprising:
a motor;
a housing that accommodates the motor;
a hammer rotated by the motor in a rotating direction; and
an anvil struck by the hammer in the rotating direction,
wherein a thrust bearing is provided between a rear part of the hammer and the housing.

### Claim 11 (depends on 10)

The impact tool according to claim 10,
wherein the hammer is rotated by the motor intermittently.

### Claim 12 (depends on 11)

The impact tool according to claim 11,
wherein a planetary gear is supported by the hammer, and
wherein the thrust bearing is provided at an outside of the planetary gear in a diametrical direction of the planetary gear.

### Claim 13

An impact tool comprising:
a motor,
a hammer rotated by the motor in a rotating direction, and
an anvil struck by the hammer in the rotating direction,
wherein the anvil is supported by the hammer so as to rotate freely.

### Claim 14 (depends on 13)

The impact tool according to claim 13,
wherein the anvil is directly fitted to the hammer.