Safety switch for power tool
US4006334A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1975 |
| Grant date | Feb 1, 1977 |
| Priority date | — |
| Expiry date | Mar 17, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H9/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention teaches an on/off switch design that can be used in electric power tools, where the power is normally off and further cannot be shifted on unless a switch actuating element is first manipulated through two right angle motions according to a predetermined sequence. The subject device has a normally off on/off switch and a switch actuating element that is supported to move against the switch to shift the same on. The actuating element carries a latch that normally holds it in the switch off position. The latch must first be moved laterally against the force of a biasing spring and held there to release the actuating element, and only then can the actuating element be moved at right angle to the latch releasing movement and then depressed, effective to switch the on/off switch on.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.