# US 7,743,687 B2 · Screwdriver helper

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- Number: US 7,743,687 B2
- Document ID: US7743687B2
- Status: Granted
- Kind: B2
- Application number: 12/139,511
- Filed: 2008-06-16
- Published: 2008-12-25
- Granted: 2010-06-29
- Earliest claimed: 2007-06-21
- Assignees: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD.; Hon Hai Precision Industry Co., Ltd.
- Inventors: Li-Chin Lu; Jian-Hua Xiang; Guan-Wu Xu
- Web page: https://patentgrep.com/patent/US7743687B2

## CPC

- B25B 23/101: {for hand-driven screw-drivers (B25B23/105 takes precedence)}
- B25B 23/10: using mechanical gripping means
- B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING

## Abstract

A screwdriver helper includes a handle, a guide, and a bit. The handle defines a through hole therein. The guide is affixed to the handle. The guide comprises a top surface, a bottom surface, and a through guide hole defined between the top surface and the bottom surface. The top surface is faced to the handle. The guide hole is corresponding to the through hole of the handle. An axis of the guide hole is perpendicular to the bottom surface. The bit is positioned in the guide hole. The bit comprises a tip and a head. The tip is in a shape of a screw head. The head defines slots in a top end thereof. The bit is movable along the axis of the through guide hole. The screwdriver helper helps screwdriver to lock screws firmly.

## Claims

### Claim 1

A screwdriver helper comprising:
a handle with a through hole defined therein;
a guide affixed to the handle, the guide comprising:
a top surface facing the handle;
a bottom surface; and
a through guide hole, corresponding to the through hole of the handle, being defined between the top surface and the bottom surface, wherein an axis of the through guide hole is perpendicular to the bottom surface, and the through guide hole is a stepped hole comprising a large diameter top part and a small diameter bottom part; and
a bit positioned in the through guide hole, the bit comprising:
a tip in a shape of a screw head; and a head defining slots in a top end thereof, wherein the bit is movable along the axis of the through guide hole.

### Claim 2 (depends on 1)

The screwdriver helper of claim 1, wherein a diameter of the head is equal to the large diameter of the top part of the stepped hole.

### Claim 3 (depends on 1)

The screwdriver helper of claim 1, wherein the bit further comprises a shaft between the tip and the head, a diameter of the shaft is equal to the small diameter of the bottom part of the stepped hole.

### Claim 4 (depends on 1)

The screwdriver helper of claim 1, wherein a diameter of the through hole defined in the handle is smaller than the large diameter of the top part of the stepped hole.

### Claim 5 (depends on 1)

The screwdriver helper of claim 1, wherein the bit is magnetic.