Fluid handling – Processes
Patent
1996-07-03
1999-06-22
Lee, Kevin
Fluid handling
Processes
137615, 285320, B67D 564
Patent
active
059133236
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention refers to a device for pumping concrete, comprising a supporting arm projecting at an operating position and used for positioning the conduit end of a pump conduit, said supporting arm including supporting arm segments which each have arranged thereon at least one tubular segment constituting a component of said pump conduit
Such devices for pumping concrete are known in practice. They are used e.g. in construction engineering, especially for producing multistoreyed buildings, bridges and the like, where it is necessary to convey large amounts of concrete onto a high level within a short period of time. Such devices are in most cases mounted on chassis of trucks and, at the operating position, they permit lifts of approx. 40 m. Due to the fact that the supporting arm is subdivided into supporting arm segments, said supporting arm can be disassembled or folded for the purpose of transport Weight limitations and limitations in the admissible dimensions make it, however, impossible to use devices of the type mentioned at the beginning which achieve higher lifts. This limits the possible field of use of said device.
SUMMARY OF THE INVENTION
Hence, it is the object of the present invention to provide a device or the type mentioned at the beginning which has an enlarged field of use in comparison with conventional devices for pumping concrete.
In accordance with the present invention, this object is achieved by the features that at least one of said supporting arm segments is adapted to be telescoped and can be transferred from a non-extended starting position to at least one extended position at which the length of said telescopic supporting arm segment is longer than the length of the respective associated tubular segments, that there is provided at least one positioning means for positioning at least one auxiliary tubular segment, said positioning means being adapted to be transferred from a first position at which the auxiliary tubular segment is arranged outside the volume taken up by the tubular segments to a second position at which at least one end section of said auxiliary tubular segment is in alignment with at least one end section of one of said tubular segments, and that the pump conduit is adapted to be formed essentially by the tubular segments and the auxiliary tubular segment.
The solution is simple and it makes it possible to provide a device for pumping concrete by means of which the same lift as in the case of conventional devices for pumping concrete can be achieved on the basis of smaller dimensions, or lifts which are higher than those obtained up to now can be achieved on the basis of dimensions which are essentially identical to those of conventional devices.
In accordance with the present invention, a separation point can additionally be arranged at least between two tubular segments so that at one of the extended positions of the telescopic supporting arm segment the end sections of the associated tubular segments, which define the separation point, are spaced from one another in such a way that the auxiliary tubular segment is adapted to be positioned between said end sections defining the separation point. In this way, the auxiliary tubular segment can be inserted between two tubular segments.
In accordance with an advantageous further development of the present invention, an end section of the auxiliary tubular segment can always be positioned essentially on one level with an end section of a tubular segment in the axial direction of the associated end section. The movements required for inserting the auxiliary tubular segment between two tubular segments can be reduced in this way.
A particularly economy-priced solution is obtained when the positioning means is constructed as a movable holder for the auxiliary tubular segment. In addition, it will be advantageous when the positioning means is constructed as a pivotable holder for the auxiliary tubular segment.
A particularly compact device will be obtained when the holder is arr
REFERENCES:
patent: 3150753 (1964-09-01), Ivanyi
patent: 3707990 (1973-01-01), Schaible et al.
patent: 4130134 (1978-12-01), Castle
patent: 4828033 (1989-05-01), Frison
patent: 5535780 (1996-07-01), Schlecht et al.
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