Internal vibrator supplied with current from a transformer
US6084327A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1993 |
| Grant date | Jul 4, 2000 |
| Priority date | — |
| Expiry date | Dec 30, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G21/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An internal vibrator for compacting concrete and having a vibrator housing in which is disposed an eccentric mass and an electric motor for driving the eccentric mass. The electric motor is supplied via a power supply cord with electric current having a frequency that is greater than line frequency. The vibrator comprises a switch for controlling the electric motor, and also includes a transformer for supplying to the electric motor the electric current having the frequency that is greater than line frequency. The switch and the transformer are combined in a common housing to form a miniaturized built-in unit on the power supply cord.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.