Frequency converter for an immersion vibrator

1. In combination:

an immersion vibrator, including:

a vibration bottle that houses an electric motor and an imbalance, the imbalance being driven by the electric motor,

a switch housing connected to the vibration bottle and bearing an on-off switch that is electrically coupled to the electric motor, and

a first mains plug configured to plug into a socket of at least one of 1) a special voltage network and 2) a stationary frequency converter so as to receive a special voltage and to supply the special voltage to the electric motor via the switch; and

a frequency converter, including:

a mobile converter housing;

a converter circuit that is arranged in the converter housing and that converts an electrical mains voltage to the special voltage, the mains voltage having a frequency level lower than the special voltage;

a second mains plug configured to be plugged into a public mains system so as to supply public mains power to the converter circuit;

a plug socket which is fed with the special voltage from the converter circuit, wherein the first mains plug plugs into the plug socket; and

a manually operated changeover switch having a first position so as to cause the converter circuit to convert the mains voltage received at the second mains plug of the frequency converter to the special voltage for communication to the second mains plug, and a second position so as to cause the converter circuit to pass through the special voltage received at the second mains plug of the frequency converter to the first mains plug without modifying the special voltage.

2. The combination as claimed in claim 1 , wherein the frequency converter further comprises a mechanical securing device in the region of the plug socket, via which the first mains plug is held in the plug socket.

3. The combination as claimed in claim 1 , wherein the converter housing has an elongated external shape with minimized transverse dimensions configured to withstand immersion in a liquid concrete.

4. The combination as claimed in claim 1 , wherein the converter housing has a smooth outer skin, and allows mobile handling of the frequency converter.

5. The combination as claimed in claim 1 , wherein the second mains plug is connected to the housing of the converter via a supply cable.

6. In combination:

an immersion vibrator, including an electric motor, an imbalance driven by the electric motor, an on-off switch that is electrically coupled to the electric motor, and a first mains plug configured to plug into a socket of at least one of 1) a special voltage network and 2) a stationary frequency converter so as to receive a special voltage and to supply the special voltage to the electric motor; and

a frequency converter, including:

a mobile converter housing;

a converter circuit which is arranged in the converter housing and which converts an electrical mains voltage to the special voltage, the mains voltage having a frequency level lower than the special voltage;

a second mains plug which is configured to be plugged into a public mains system so as to supply public mains power to the converter circuit; and

a plug socket which is fed with the special voltage from the converter circuit, wherein the first mains plug plugs into the plug socket.

7. The combination of claim 6 , further comprising a manually operated changeover switch having a first position so as to cause the converter circuit to convert the mains voltage received at the second mains plug of the special voltage for communication to the first mains plug, and a second position so as to cause the converter circuit to pass through the special voltage received at the second mains plug to the first main plug without modifying the special voltage.

8. The combination as claimed in claim 6 , wherein the frequency converter further comprises a mechanical securing device in the region of the plug socket, via which the first mains plug is held in the plug socket.

9. The combination as claimed in claim 6 , wherein the converter housing has an elongated external shape with minimized transverse dimensions configured to withstand immersion in a liquid concrete.

10. The combination as claimed in claim 6 , wherein the converter housing has a smooth outer skin, and allows mobile handling of the frequency converter.

11. The combination as claimed in claim 6 , wherein the second mains plug is connected to the housing of the converter via a supply cable.

12. The combination of claim 11 , wherein the switch housing is connected to the first mains plug by a supply cable.

13. The combination as claimed in claim 6 , wherein the immersion vibrator further comprises

a vibration bottle that houses the electric motor and the imbalance, and

a switch housing that is connected to the vibration bottle and that bears the on-off switch.

14. In combination:

a hand operated tool including an electric motor, a working device driven by the electric motor, an on-off switch that is electrically coupled to the electric motor, and a first mains plug configured to plug into a socket of at least one of 1) a special voltage network and 2) a stationary frequency converter so as to receive a special voltage and to supply the special voltage to the electric motor; and

a frequency converter, including:

a mobile converter housing;

a converter circuit which is arranged in the converter housing and which converts an electrical mains voltage to the special voltage, the mains voltage having a frequency level lower than the special voltage; and

a second mains plug which is configured to be plugged into a public mains system so as to supply public mains power to the converter circuit;

a plug socket which is fed with the special voltage from the converter circuit, wherein the first mains plug plugs into the plug socket.