# US 8,770,070 B2 · Universal anti-torque screwdriver head structure

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- Number: US 8,770,070 B2
- Document ID: US8770070B2
- Status: Granted
- Kind: B2
- Application number: 13/454,046
- Filed: 2012-04-23
- Published: 2013-10-24
- Granted: 2014-07-08
- Earliest claimed: 2012-04-23
- Applicants: Tsai-Fa Liu
- Inventors: Tsai-Fa Liu
- Web page: https://patentgrep.com/patent/US8770070B2

## CPC

- B25B 15/005: {with cross- or star-shaped cross-section}
- B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING

## Abstract

The present invention discloses a universal anti-torque screwdriver head structure integrally formed and divided into a polygonal insert end and a conical action end, and comprising a plurality of pull-push wings disposed around the action end, a stepped recessed formed between two adjacent pull-push wings and extended inwardly from an open end, and the recess having a longitudinal depth slightly greater than an action hole of a screw of a general specification, and the design of the stepped recess provides high-strength torque and tenacity and fits screws of various different specifications.

## Claims

### Claim 1

A universal anti-torque screwdriver head structure, integrally formed and divided into a polygonal insert end and a conical action end, and comprising
a plurality of pull-push wings disposed around the action end,
a stepped recess formed between two adjacent pull-push wings and extended inwardly from an open end, and
the recess having a longitudinal depth slightly greater than an action hole of a screw of a general specification.

### Claim 2 (depends on 1)

The universal anti-torque screwdriver head structure of claim 1, further comprising a non-skid thread formed on each cross-section of the stepped recess of the action end.