Dispensing – Movable material discharge guide – Foldable – bendable – collapsible or flexible
Reexamination Certificate
1999-04-09
2001-06-12
Bomberg, Kenneth (Department: 3754)
Dispensing
Movable material discharge guide
Foldable, bendable, collapsible or flexible
C222S526000, C193S00200R, C193S0250AC, C193S0250AC
Reexamination Certificate
active
06244477
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention refers to a device for discharging concrete, comprising a flexible hose, which is connected to a concrete supply line, preferably a concrete supply line of a concrete pump, said hose being provided with an input end which is associated with the supply line and through which the concrete conveyed through the supply line enters the hose and an output end through which the concrete conveyed through the hose leaves said hose for the purpose of discharge, said hose being adapted to be bent in at least one swivelling plane between a substantially straight initial position and a curved position, and further comprising a swivelling means for moving the hose from its straight initial position to its curved position, said swivelling means comprising at least one drawing and/or pushing means which is effective in the swivelling plane and which extends, at least at the initial position of the hose, outside of the longitudinal central axis of the hose and at least indirectly between a first bearing associated with the output end of the hose and fixedly connected to the hose and a second bearing associated with the input end and fixed relative to said input end at least in the drawing and/or pushing direction of the drawing and/or pushing means, and at least one actuating means being provided, which applies a drawing and/or pushing force to the drawing and/or pushing means and which is operatively connected to said drawing and/or pushing means in such a way that the distance between the first and second bearings can be reduced by actuating the respective actuating means, whereby the hose can be moved from its initial position to its curved position.
2. Description of the Related Art
Such a device is known e.g. from DE-A-2752605. This device is provided with a piston-cylinder unit by means of which the hose can be moved from its initial position to its curved position. Due to the fact that the output end can be swivelled relative to the input end, the concrete can be discharged such that it is applied to the areas aimed at without moving the concrete supply line itself. However, a device of this type proves to be disadvantageous insofar as the possible swivelling angle is strongly limited by construction-dependent circumstances. The swivelling angle is limited by the distance of the piston rod and of the piston-cylinder unit from the hose. For enlarging the swivelling angle, the distance between the piston-cylinder unit and the hose has to be enlarged. This, however, results in a substantial increase in the physical size and in the fact that a larger number of components is required so that the weight of the device will be increased; this is disadvantageous, especially in the case of long, projecting supporting arms. In addition, such a device does not suffice to fulfill all the requirements which have to be satisfied for operating a concrete pump.
OBJECTS AND SUMMARY OF THE INVENTION
Hence, it is the object of the present invention to further develop a device of the type mentioned at the start in such a way that it is easy to produce, has the lowest possible weight and the smallest possible physical size as well as the largest possible effective swivelling angle of the output end of the hose. In addition, it should be adapted to be used more universally.
According to the present invention, this object is achieved by the features that the hose is adapted to be bent in at least two swivelling planes which are arranged at an angle relative to one another and that at least two drawing and/or pushing means are provided, which are effective in the respective swivelling planes, said drawing and/or pushing means being flexible.
This solution is simple and advantageous insofar as the device can be provided with a structural design of such a nature that it has a comparatively low weight. In addition, the number of components required is smaller than in the case of conventional solutions, whereby the device can be produced more easily. The device can now also be provided with a very compact structural design and, in comparison with conventional solutions, larger swivelling angles of the output end can be achieved. Furthermore, the concrete pump can be used more universally due to the possibility of swivelling the hose end in at least two swivelling planes.
In this connection, it may prove to be advantageous when the swivelling planes include a right angle.
At least one of the first or second bearings can be arranged in spaced relationship with the respective associated input end or output end in an advantageous manner. This offers the possibility of causing the hose to bend in different curvatures, e.g. an S-shaped curvature.
In accordance with an advantageous further development of the present invention, the actuating means can be provided between one of the bearings and the drawing and/or pushing means. This permits an even more compact structural design of the device.
In this connection, it may prove to be advantageous when the respective actuating means is provided between the second bearing and the drawing or pushing means.
In order to obtain a structural design which is as simple and as reliable as possible, it may prove to be advantageous when the respective actuating means is implemented as a piston-cylinder unit.
According to an advantageous further development of the present invention, also the respective second bearing can be connected to the hose. This offers the possibility of providing the device independently of the supply line, or of providing it instead of a hose which is not equipped with a device according to the present invention. This offers the possibility of retrofitting old concrete pumps.
It may also prove to be advantageous to fasten the respective actuating means to the hose and to connect it to one of the bearings of the drawing and/or pushing means. This can be advantageous especially for retrofitting old concrete pumps, since, depending on the spatial conditions, the actuating means can be provided either at the first or at the second bearing.
In accordance with an advantageous further development of the present invention, it may be of advantage when the respective drawing and/or pushing means extends parallel to the longitudinal axis of the hose at the initial position of the hose. In addition, it may prove to be advantageous when the respective first bearing is arranged laterally of and in spaced relationship with the longitudinal axis of the hose. It may also be advantageous when the respective second bearing is arranged laterally of and in spaced relationship with the longitudinal axis of the hose.
In accordance with an advantageous further development of the present invention, it may also prove to be of advantage when additional drawing and/or pushing means are provided, the bearings being then arranged such that they are distributed over the circumference of the hose. This offers the possibility of bending the hose into different directions, and this will permit a better distribution of the concrete discharged.
In this connection, it may prove to be particularly advantageous when at least two drawing and/or pushing means are provided, which, at least at the initial position of the hose, are arranged in opposed relationship with each other relative to the longitudinal axis of the hose. This offers the possibility of achieving swivelling angles of 180° or more in one plane.
In accordance with an advantageous further development of the present invention, three drawing or pushing means can be provided, which, at the initial position of the hose, are arranged such that they are uniformly distributed about the longitudinal axis of the hose, and the hose can be adapted to be swivelled in several swivelling planes. The device can be used even more universally in this way.
A further advantageous embodiment of the present invention is so conceived that, at the initial position, four drawing and/or pushing means can be arranged such that they are uniformly distributed about the longitudinal axis of th
Bomberg Kenneth
Hudelmaier Ulrike
Nilles & Nilles S.C.
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