Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Reexamination Certificate
1999-03-18
2001-10-23
Eley, Timothy V. (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
C254S423000, C254S08900R, C254S0930HP
Reexamination Certificate
active
06305667
ABSTRACT:
FIELD
The invention relates to a lifting device for lifting heavy loads, e.g. derailed rail vehicles, for permanent or temporary installation, having at least one cylinder, in particular hydraulic cylinder, for actuating a mechanical ram. In concrete terms, the present invention relates to a so-called “internal jack”.
BACKGROUND
Vehicles (e.g. trams, underground trains, etc.) which, in the event of derailment, are impossible to lift and/or move from outside the derailed vehicle (e.g. when in tunnels) are recovered using so-called “internal jacks”. Internal jacks are understood to mean lifting devices which are fitted permanently or temporarily in the floor area in the interior of the vehicle and by means of which recovery measures can be carried out from outside even where accessibility is extremely restricted. Known internal jacks are designed as single-acting hydraulic cylinders or telescopic cylinders which are generally attached in the floor of the vehicle. Therefore, a floor sleeve provided for this purpose is arranged on the vehicle. The cylinder is installed head-first in this floor sleeve. In operation, the piston rod, when actuated, extends downwards and lifts the vehicle body so that it can then be moved.
In low-floor vehicles, which are now being used to an increasing extent, suitable installation of the internal jacks is becoming more and more difficult due to the restricted space available.
SUMMARY
The object of the present invention consists in providing a lifting device which can be used for low-floor vehicles and, at the same time, has a high level of safety against buckling and flexural load-bearing capacity combined with perfect running.
This object is achieved, in the lifting device of the generic type, by the fact that cylinder and ram are separated from one another and the ram is accommodated in a guide tube. The invention makes it possible to achieve a lifting device which provides sufficient force and very stable guidance in the area of the ram and which can be accommodated in particular in the outer wall area of low-floor vehicles.
Advantageously, the ram is designed as a hollow ram. This firstly reduces its weight and secondly simplifies fitting of the ram. On the other hand, the strength of the ram is maintained.
The tool insert, which may in particular be designed as an exchangeable tool insert, is situated at the front end of the hollow ram.
To attach the lifting device to the vehicle, the guide tube comprises a catch, in particular a bayonet catch. The catch is advantageously situated in the floor area of the vehicle.
According to a further configuration of the present invention, cylinder and ram are connected to one another in an articulated manner. This prevents elastic distortions in use from being transmitted from the ram area to the cylinder area, where they would lead to damage to the running faces or seals.
Such an articulated connection can be produced in a particularly simple manner by using a ball socket and ball cap in the area of the contact face between ram and piston rod of the cylinder.
Advantageously, the articulated movement of ram with respect to piston rod is spring-loaded, specifically, by way of example, by means of at least one spring element which is provided between cylinder and ram and may be designed as a spring element which acts in the axial direction.
According to a further configuration of the present invention, the ram and the piston rod of the cylinder can be connected to one another by means of a threaded bolt which can be introduced axially via the inside of the hollow ram.
Furthermore, according to a refinement of the invention, a holding ring, e.g. in the form of a clasp nut, is provided in the area of the connection between piston rod and ram. The holding ring holds together the area where the piston rod of the cylinder and the guide tube meet. To avoid adverse effects from dirt, a seal is provided between holding ring and cylinder. The seal has the further advantage that the ram cannot itself be rotated with respect to the cylinder in the load-free state as a result of slight shaking, and therefore the connection between holding tube and vehicle cannot be released unintentionally.
The holding ring is designed or dimensioned in such a way that it allows a pivoting movement of the ram, including guide tube, with respect to the cylinder.
The outer sides of the cylinder and of the holding ring are expediently aligned, so that the diameter of the cylinder is not exceeded, thus ensuring problem-free installation.
Furthermore, it is possible, in particular in the case of a lifting device which remains permanently on the vehicle, to provide a securing device for fixing the position of cylinder and/or ram.
The securing device used is, for example, at least one securing pin in the area of the cylinder and/or ram and/or holding ring. The securing pin may in this case advantageously be arranged so as to run in the radial direction.
The lifting device according to the invention is very particularly suitable for installation in the outer wall area of the vehicle, in particular, for example, in the section column of the outer wall. The locking position of the lifting device is preferably provided in the floor area of the vehicle.
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Lukas—Kompakt-Aufgleisanlage Compact Rerailing System Nov. 1998.*
Search Report dated Aug. 25, 1999.
Eley Timothy V.
Lukas Hydraulik GmbH & Co. KG
Merchant & Gould P.C.
Wilson Lee
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