Torsion screwdriver
US6202512A · kind A · utility
Inventors
Key dates
| Filing date | Feb 11, 1999 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Feb 11, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25F1/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A torsion screwdriver includes a positioning sleeve, a locking tube, a plurality of locking cylinder rods, a curved spring strip, a rotary member, a coupling sleeve, and a bit-driving shaft. The locking tube is disposed in the positioning sleeve, and is formed with rod-retaining slots for receiving the locking cylinder rods. The curved spring strip has one end connected to the locking tube, and the other end abutting against a projection at a front end of the positioning sleeve. The coupling sleeve is disposed in a sleeve-receiving hole of the locking tube, which is communicated with the rod-receiving slots, such that rotation of the positioning sleeve in a first direction results in co-rotation of the coupling sleeve with the positioning sleeve, whereas rotation of the positioning sleeve in a second direction results in idle rotation of the positioning sleeve relative to the coupling sleeve. The rotary member is coupled to the locking tube for co-rotation therewith, and the coupling sleeve is retained rotatably on the rotary member. The bit-driving shaft extends into the coupling sleeve, and is formed with keys for engaging keyways in the coupling sleeve to allow removable and non…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.