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This is a record of a document published elsewhere, first published by the United States Patent and Trademark Office, as US-4970922-A, on 20 November 1990. 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-2026-000003437

Torque driving tool and retainer for driven member

Published
Permanent URL
Classification
Tools & Tooling › Clamping Tools
Inventors
KRIVEC BERT
Assignee
SNAP ON TOOLS CORP
Original source
US-4970922-A, the United States Patent and Trademark Office, 20 November 1990
Document SHA-256
19319eb82dd7042064f3beab1f7f16c7d7867836a5d8a10c4b269511b0c189b7

A rotatable driving tool for imparting torque to a driven member, such as a threaded fastener having an axial recess in the head thereof, comprises a circularly cylindrical body with a plurality of substantially circularly helical driving portions projecting laterally therefrom and equiangularly spaced about the cylindrical axis, each of the driving portions having a small helix angle, preferably between one and three degress. The driving portions mate with lobes of the fastener recess but are slightly inclined with respect thereto to provide a wedge fit to retain the fastener in engagement with the tool body.

Sheet 1
Sheet 1

Abstract

A rotatable driving tool for imparting torque to a driven member, such as a threaded fastener having an axial recess in the head thereof, comprises a circularly cylindrical body with a plurality of substantially circularly helical driving portions projecting laterally therefrom and equiangularly spaced about the cylindrical axis, each of the driving portions having a small helix angle, preferably between one and three degress. The driving portions mate with lobes of the fastener recess but are slightly inclined with respect thereto to provide a wedge fit to retain the fastener in engagement with the tool body.

1. Drawings

[0001]Sheet 1.

Publication information

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Citation

OpenTechnical Publication OT-2026-000003437, “Torque driving tool and retainer for driven member,” published September 15, 2026 at 20:27:30 UTC, https://opentechnical.org/p/OT-2026-000003437.

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