Ratchet extraction wrench
US7152508B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2005 |
| Grant date | Dec 26, 2006 |
| Priority date | — |
| Expiry date | Feb 28, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B27/18
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A combination ratchet wrench having a standard open-type or box-type wrench at one end thereof and a ratcheting extraction box at the other end thereof. The ratchet extraction wrench box is connected by a ratcheting mechanism to the wrench that allows rotation of the ratchet extraction wrench box relative to the wrench only in one direction. The ratchet extraction wrench box is provided with a fastener extraction head that has an interior bore extending inwardly from a receiving end. The bore has a plurality of helically-shaped grooves, each extending from the receiving end and curve radially and inwardly towards the central axis of the bore to form sharp ridges that extend in a helical fashion inside the bore. When the fastener extraction is placed over a fastener head, the ridges “bite” into the material of the fastener. Because the extraction head is formed as an integral part of the wrench there is no need to have a separate turning tool. Because a separate torque producing tool is not required and the wrench has a narrow profile, the extraction wrench can be used in tight spaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.