OpenTechnical
This is a record of a document published elsewhere, first published by the United States Patent and Trademark Office, as US-5957645-A, on 28 September 1999. OpenTechnical did not first disclose it. The identifier, hashes and timestamps below record what this library served and when, not when the material became public. View the original.

OT-2026-000003176

Spiral drive system for threaded fasteners

Published
Permanent URL
Classification
Tools & Tooling › Clamping Tools
Inventors
STACY W DODD
Assignee
PHILLIPS SCREW CO
Original source
US-5957645-A, the United States Patent and Trademark Office, 28 September 1999
Document SHA-256
2b76bafb1d42e1fe2e1bf14db219ab360cd295a4eba19396f41aa196e2e6d777

A spiral drive system for threaded fasteners includes driver-engageable surfaces on the head end of the fastener in which at least some of the driver-engageable surfaces are defined by a spiral segment configured to maximize torque transmission while spreading the driving load over a broad driver-fastener interface to reduce the risk of development of high stress regions. Drivers and related tooling also are disclosed.

Sheet 1
Sheet 1
Sheet 2
Sheet 2
Sheet 3
Sheet 3
Sheet 4
Sheet 4
Sheet 5
Sheet 5
Sheet 6
Sheet 6
Sheet 7
Sheet 7
Sheet 8
Sheet 8
Sheet 9
Sheet 9

Abstract

A spiral drive system for threaded fasteners includes driver-engageable surfaces on the head end of the fastener in which at least some of the driver-engageable surfaces are defined by a spiral segment configured to maximize torque transmission while spreading the driving load over a broad driver-fastener interface to reduce the risk of development of high stress regions. Drivers and related tooling also are disclosed.

1. Drawings

[0001]Sheet 1.

[0002]Sheet 2.

[0003]Sheet 3.

[0004]Sheet 4.

[0005]Sheet 5.

[0006]Sheet 6.

[0007]Sheet 7.

[0008]Sheet 8.

[0009]Sheet 9.

Publication information

Plain textMarkdownManifestIntegrity record

Citation

OpenTechnical Publication OT-2026-000003176, “Spiral drive system for threaded fasteners,” published September 15, 2026 at 19:44:12 UTC, https://opentechnical.org/p/OT-2026-000003176.

To cite specific content, add the paragraph or figure numbers.

Terms

This record reproduces a document published elsewhere and is provided for reference and study. Rights in the original remain with its owner. See the publication policy.