Screw drivers
US6536537B1 · kind B1 · utility
30Cited by
8References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 29, 2000 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Feb 29, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/141
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a powered screw driver having a spindle 20 that is caused to rotate by an electric motor 10 within a range of about 5000 rpm (revolutions per minute) to about 7000 rpm (revolution per minute) when the spindle 20 idles. Because the spindle 20 rotates at a high revolution speed, the screw-fastening operation can more quickly be completed when the user of the screw driver 1 fastens the screw in a normal posture. The screw driver 1 may used to fasten screws having a pitch within a range of about 1.3 mm to 2.0 mm (i.e. about {fraction (1/32)} inch to {fraction (3/32)} inch).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.