# US 2014/0196576 A1 · Controlling structure for a unidirectional ratchet wrench

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- Number: US 2014/0196576 A1
- Document ID: US20140196576A1
- Status: Published application
- Kind: A1
- Application number: 13/740,290
- Filed: 2013-01-14
- Published: 2014-07-17
- Earliest claimed: 2013-01-14
- Assignees: Yung Fong Tools Co., Ltd.
- Inventors: YU WEN CHEN; Tien Sung Chen
- Web page: https://patentgrep.com/patent/US20140196576A1

## CPC

- B25B 13/463: {a pawl engaging an externally toothed wheel}
- B25B 13/04: of ring jaw type
- B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING

## Abstract

A controlling structure for a unidirectional ratchet wrench contains a driving head of a unidirectional ratchet wrench, and driving head having a receiving cavity and a groove communicating with the receiving cavity. The receiving cavity has a driving member, and the driving member has a toothed portion. The groove has a retaining block received therein, and the retaining block has a plurality of locking teeth so as to engage with the toothed portion. The retaining block has a slot or a tab so as to retain with the elastic member. The elastic member has a fitting segment, a curved section, and an abutting segment, the fitting segment is fitted into the slot or is retained with the tab, the curved section extends outwardly from the fitting segment and becomes curved, and the abutting segment connects with the curved section and abuts against the groove.

## Claims

### Claim 1

A controlling structure for a unidirectional ratchet wrench comprising:
a driving head of an unidirectional ratchet wrench, and the driving head including a receiving cavity defined in a front end thereof and a groove formed in a rear end thereof and communicating with the receiving cavity;
the receiving cavity having a driving member received therein, and the driving member having a toothed portion arranged around an outer wall thereof;
the groove having a retaining block received therein, and the retaining block having a plurality of locking teeth formed on a front end thereof so as to engage with the toothed portion of the driving member; the retaining block having a slot defined therein or a tab extending outwardly therefrom so as to retain with the elastic member;
wherein the elastic member has a fitting segment, a curved section, and an abutting segment, the fitting segment is fitted into the slot of the retaining block or is retained with the tab, the curved section extends outwardly from the fitting segment and becomes curved, and the abutting segment connects with the curved section and abuts against the groove.

### Claim 2 (depends on 1)

The controlling structure for the unidirectional ratchet wrench as claimed in claim 1, wherein the elastic member is integrally formed.

### Claim 3 (depends on 1)

The controlling structure for the unidirectional ratchet wrench as claimed in claim 1, wherein the elastic member is a solid elastic block or a hollow elastic piece.

### Claim 4 (depends on 1)

The controlling structure for the unidirectional ratchet wrench as claimed in claim 1, wherein the elastic member is formed in a C shape.