Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Fluid pressure actuated
Patent
1990-10-19
1992-06-02
Scherbel, David A.
Static structures (e.g., buildings)
Mechanism operated relatively movable shaft assembly
Fluid pressure actuated
212189, 52118, 280840, B66C 2336
Patent
active
051175959
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for raising and aligning a tiltable telescopic mast that is mounted on a transport vehicle and that can be raised by means of one or more lifting cylinders from a horizontal or almost horizontal transport position in a vertical plane parallel to a longitudinal axis of the transport vehicle up to a vertical position of the mast in this plane, and which includes devices in the form of vertically adjustable support booms, to brace the telescopic mast on the ground in a vertical plane transverse to the longitudinal axis of the transport vehicle.
A device for raising and aligning a tiltable telescopic mast mounted on a transport vehicle is known from DE 31 05 621 C2. Furthermore, a lifting device disclosed in DE-OS 26 52 244 also comprises a tiltable telescopic mast mounted on a transport vehicle, where the transport vehicle can be braced on the ground by means of support booms.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a device of the aforementioned type but which makes it possible in a simple manner to raise and align a tiltable telescopic mast mounted on a transport vehicle in the vertical direction with little loss of time, where owing to the only short movements of the individual parts negligible bending moments are exerted on such mechanical parts and the process of raising and aligning can be readily automated.
This object is achieved by the provision of a device which comprises: frame of the vehicle so as to be vertically adjustable by means of three lifting elements, which can be lowered and swung out and by actuating only one pull device.
According to a preferred feature, each support boom is connected to the supporting frame by means of an upper, Cardan joint and a bottom guide pin sliding in a connecting link guide of the supporting frame.
According to another preferred feature, the pull device, which acts both to swing out and to lower each support boom, is a spindle drive. Thus, it is possible to lower the support boom reliably, without play and with accuracy.
According to yet another preferred feature, the bottom end of the support boom that faces the supporting frame and with which the pull device engages can be drawn into a bottom guide located in the supporting frame. Thus, it is achieved that following the lowering of the support booms, which brace the extended telescopic mast, a system that is mechanically intrinsically very stable is formed.
According to still another preferred feature, the three lifting elements, which are attached between the supporting frame for the telescopic mast and the vehicle frame and which bring about vertical adjustment between the supporting frame and the vehicle frame, are dimensioned in such a manner that after the telescopic mast has been raised and placed in position, the transport vehicle can be lifted from the ground by suitably actuating the lifting elements. In this case the telescopic mast has contact with the ground only by means of the four support booms, preferably with the insertion of base plates, and the transport vehicle that is raised from the ground and at this stage hangs via its vehicle frame and the threaded spindles from the supporting frame of the telescopic mast represents a ballast, a feature that contributes to further stabilization of the erected telescopic mast.
According to an even further preferred feature, the lifting elements and/or the lifting cylinder are/is formed by threaded spindles or by hydraulic drives or hydraulic motors.
Telescopic masts, in particular telescopic latticed 5 masts, can have a significant height of, e.g., up to 45 m. Such movable telescopic masts can be used, e.g., as antenna masts for directional antennas, in particular parabolic antennas. In the present device the supporting frame represents a central unit of the antenna carrier to which are coupled all elements to be moved. Thus, all forces acting on the telescopic mast are absorbed and dissipated over the hinged-on support booms. The supporting fr
REFERENCES:
patent: 2375264 (1945-05-01), Wagner et al.
patent: 4397396 (1983-08-01), Kay et al.
Geroh GmbH Mechanische Systeme
Scherbel David A.
Wood Wynn
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