Ergonomic handle for hand tool
US4488460A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1982 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Jul 28, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/20828
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An improved ergonomic handle for a hand tool or other implement has a substantially elliptical cross-section taken in a first plane which forms a dihedral angle of approximately thirty (30) degrees with respect to a second plane which is normal to the longitudinal axis of the shank of the tool. The length of the minor axis of the elliptical cross-section is approximately sixty percent (60%) of the length of the major axis. The longitudinal axis of the shank passes through the elliptical cross-section and through the line formed by the intersection of the first and second planes. The handle is formed substantially as a revolution of the elliptical cross-section about its major axis. As a result, the handle is well balanced and accommodates a variety of hand grips for various uses or orientations of the tool, and the handle is convenient and comfortable for substantially reducing operator fatigue over extended use of the tool. This is especially advantageous in connection with a hand ratchet tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.