Electricity: transmission to vehicles – Flexible extensions – Reels
Reexamination Certificate
1999-06-30
2001-05-01
Morano, S. Joseph (Department: 3617)
Electricity: transmission to vehicles
Flexible extensions
Reels
C191S01200C, C191S01220R, C242S400000, C074S155000, C366S016000
Reexamination Certificate
active
06223871
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a cable drum having a winder which is rotatably mounted on the frame and which has a socket outlet mounted on it.
2. Description of the Related Art
Internal vibrators are often used on building sites in order to compact concrete. The internal vibrators are typically driven by asynchronous motors supplied with a special voltage and a special frequency. If, for example, an asynchronous motor present in the internal vibrator and having an attached unbalanced mass is to achieve a rotational speed of 12,000 rev/min, an excitation frequency of 200 Hz is required in the case of a 2-pole machine. The public power network, however, only provides a frequency of 50 Hz.
For this reason, frequency converters which were usually supplied with three-phase current to couple the motor to the public power network were used in the past.
FIG. 2
shows an example of such an arrangement. These frequency converters were very difficult to handle on account of their high weight.
According to
FIG. 2
, an internal vibrator
1
is connected to a conventional frequency converter
4
via a switch
2
and a cable
3
. Since, on building sites, greater distances usually have to be bridged between the working location and the nearest fixed mains connection, the frequency converter
4
is connected to a generally known cable drum
5
. A cable
6
can be unwound from the cable drum
5
and connected to the mains connection, which is a long way off.
In recent times, due to the provision of appropriate power electronics with corresponding semiconductors, it has become possible to miniaturize the frequency converter and, in this way, reduce its weight from, for example, 60 kg to 4 kg. Such a lighter frequency converter is still connected between the internal vibrator
1
and the cable drum
5
as a separate unit. When the internal vibrator is moved to different working locations, the frequency converter and the separate cable drum must therefore still be moved.
A cable drum having an integrated light source is described in DE-GM 7641166.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the invention is to further improve the ease of manipulation of a building-site unit, in particular of an internal vibrator, in particular its mobility between a plurality of working locations.
This object is achieved according to the invention by a cable drum having a winder which is rotatably mounted on a frame and on which at least one socket outlet is arranged, and on which a cable can be wound. A frequency converter is fastened to the winder, and at least one of the socket outlets is electrically coupled to the frequency converter and is supplied with an electric special frequency.
Due to this integration of the cable drum and the frequency converter, only the cable drum, which in addition to the cable also carries the frequency converter, needs to be additionally moved when the internal vibrator is moved from one working location to another. Furthermore, components and weight can be reduced, since the converter requires no separate housing and no complicated voltage supply.
It is especially advantageous if the frequency converter is arranged in that region of the winder which is surrounded by the cable when the cable is wound onto the winder. There is usually sufficient construction space in the interior of the winder, i.e. inside the cable winding, in order to be able to accommodate the miniaturized frequency converter. In this way, the construction space used by the cable drum is optimally utilized.
A rotary axis of the winder expediently passes through the region. The frequency converter is, therefore, arranged close to the axis of symmetry of the cable drum, as a result of which the uniform rotation of the winder is not impaired during the winding and unwinding of the cable.
It is very advantageous that the conversion of the frequency in the frequency converter is effected essentially by electronic semiconductors. It is thereby possible to miniaturize the hitherto known large and difficult-to-manipulate frequency converter such that it can be accommodated in the cable drum.
In an especially advantageous embodiment of the invention, socket outlets, which are electrically connected to the cable, are arranged on one end face of the winder. At least one of the socket outlets should be supplied with mains voltage and mains frequency, while at least another socket outlet is electrically coupled to the integrated frequency converter and supplied with an electric special frequency. Consequently, different types of socket outlets are provided on the end face of the winder, and these socket outlets either permit an extension of the public network at 230 V or 400 V or provide the special converter current, in particular for the internal vibrator.
REFERENCES:
patent: D. 289603 (1987-05-01), An
patent: D. 312204 (1990-11-01), Nelson
patent: D. 324669 (1992-03-01), Co
patent: 4282954 (1981-08-01), Hill
patent: 4721833 (1988-01-01), Dubay
patent: 4845990 (1989-07-01), Kitzinger et al.
patent: 33 10 311 (1984-09-01), None
patent: 39 21 679 (1991-01-01), None
patent: 44 05 391 (1994-09-01), None
patent: 4405391A1 (1994-09-01), None
patent: 89 16 195 (1995-02-01), None
Boyle Fredrickson Newholm Stein & Gratz S.C.
Jules Frantz F.
Morano S. Joseph
Wacker-Werke GmbH & Co. KG
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