# US 2014/0150611 A1 · One-Way Torque Tool

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- Number: US 2014/0150611 A1
- Document ID: US20140150611A1
- Status: Published application
- Kind: A1
- Application number: 13/691,477
- Filed: 2012-11-30
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Matatakitoyo Tool Co., Ltd.
- Applicants: Matatakitoyo Tool Co., Ltd.
- Inventors: Yi Min WU
- Web page: https://patentgrep.com/patent/US20140150611A1

## CPC

- B25B 13/463: {a pawl engaging an externally toothed wheel}
- B25B 13/465: {a pawl engaging an internally toothed ring}
- B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING

## Abstract

A one-way torque tool includes a head, a rotor placed in the head, a number of ratchets formed on the head, two pawls pivotally connected to the rotor and detachably engaged with the ratchets. The ratchets are separated from one another by a first angle α identical to 360 degrees divided by the number of the ratchets. The pawls are separated from each other by a second angle β identical to a multiple of the first angle α plus a third angle θ that is smaller than the first angle α.

## Claims

### Claim 1

A one-way torque tool including:
a head;
a rotor placed in the head;
a number of ratchets formed on one of the head and the rotor, wherein the ratchets are separated from one another by a first angle α identical to degrees divided by the number of the ratchets;
two pawls pivotally connected to the other one of the head and the rotor and detachably engaged with the ratchets, wherein the pawls are separated from each other by a second angle β identical to a multiple of the first angle α plus a third angle θ that is smaller than the first angle α.

### Claim 2 (depends on 1)

The one-way torque tool according to claim 1, wherein the ratchets are formed on an internal side of the head, wherein the first and second pawls are pivotally connected to an external side of the rotor.

### Claim 3 (depends on 1)

The one-way torque tool according to claim 1, further including two springs for biasing the pawls.

### Claim 4 (depends on 1)

The one-way torque tool according to claim 1, including another pawl separated from one of the pawls by a fourth angle β identical to a multiple of the first angle α plus a fifth angle θ that is smaller than the first angle α.

### Claim 5 (depends on 4)

The one-way torque tool according to claim 4, wherein the fifth angle is identical to the third angle.

### Claim 6 (depends on 4)

The one-way torque tool according to claim 4, wherein the fifth angle is different from the third angle.

### Claim 7 (depends on 1)

The one-way torque tool according to claim 1, further including a switch operable for keeping one of the pawls from the ratchets.

### Claim 8 (depends on 7)

The one-way torque tool according to claim 7, wherein the switch includes a ring switchable relative to one of the head and the rotor between a first position where the ring keeps one of the pawls from the ratchets and a second position where the ring does not keep any of the pawls from the ratchets.

### Claim 9 (depends on 8)

The one-way torque tool according to claim 8, wherein the ring includes a rib placed in the head.

### Claim 10 (depends on 9)

The one-way torque tool according to claim 9, wherein the rib includes a thick portion for pressing one of the pawls.

### Claim 11 (depends on 9)

The one-way torque tool according to claim 9, wherein switch further includes a detent for abutment against the rib to keep the ring in one of the first and second positions relative to one of the head and the rotor.

### Claim 12 (depends on 11)

The one-way torque tool according to claim 11, wherein the rib includes first and second recesses defined therein, wherein the detent is placed in the first recess when the ring in the first position relative to one of the head and the rotor, wherein the detent is placed in the second recess when the ring in the second position relative to one of the head and the rotor.

### Claim 13 (depends on 11)

The one-way torque tool according to claim 11, wherein the switch further includes a spring for biasing the detent.

### Claim 14 (depends on 13)

The one-way torque tool according to claim 13, wherein one of the head and the rotor includes a bore for containing the spring.

### Claim 15 (depends on 1)

The one-way torque tool according to claim 1, wherein one of head and the rotor includes two cutouts each for containing at least a portion of a corresponding one of the pawls.

### Claim 16 (depends on 15)

The one-way torque tool according to claim 15, wherein each of the pawls includes a pivot placed in the corresponding one of the pawls and a tip movable into engagement with the ratchets from the corresponding one of the pawls.

### Claim 17 (depends on 16)

The one-way torque tool according to claim 16, wherein each of the cutouts includes an arched face, an inclined face and a flat face extending between the arched face and the inclined face, wherein each of the pawls includes an arched face formed near the pivot and in contact with the arched face of the corresponding one of the pawls.

### Claim 18 (depends on 15)

The one-way torque tool according to claim 15, further including two springs for biasing the pawls.

### Claim 19 (depends on 18)

The one-way torque tool according to claim 18, wherein one of head and the rotor includes two pockets for containing the springs.

### Claim 20 (depends on 17)

The one-way torque tool according to claim 17, wherein each of the pawls includes a pivot placed in the corresponding one of the pawls and a tip movable into engagement with the ratchets from the corresponding one of the pawls.