Electric switch, especially for electric hand tools
US5798584A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1996 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | Mar 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2009/065
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to an electric switch (1), especially for use for an electric hand tool having an electric motor, such as a battery-operated electric tool having a direct-current motor. The switch (1) possesses a housing (2) for receiving a contact system, a movable actuating member which acts on at least one switch contact of the contact system, and control electronics (26) located in the housing (2) as well as an associated power semiconductor (28) for varying the rotational speed of the electric motor. The power semiconductor (28) is connected via a current-bearing and heat-conducting carrier part (31) to the contact system located in the housing (2) and, further, is heat-conductively connected to a cooling body (34) located on the outside of the housing (2). The carrier part (31) extends through a wall perforation (33) of the housing (2) at least as far as the cooling body (34). To simplify assembly, the cooling body (34) is held directly on the carrier part (31) non-positively and/or positively without additional fastening means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.