DE928598C - Hydraulic device for lifting platforms, containers, etc. like - Google Patents

Description

The invention relates to a # 1zgdiraul device for hitting platforms, containers, etc., with at least two of these, lifting cylinders, such are connected one behind the other, so that the space above the column of the first cylinder with, the space below: the piston, this second is in communication by a pipe and, both spaces with the line are filled with liquid.

You can use three or four spindles to lift platforms or containers be used, which attack the platform sideways and unleash its drive is to achieve an equal lifting. It can also be used at various corners attack: de ropes are used which attf a common troimm-el wound- or whose troimmels are coupled to one another. It is also known Lifting platforms by means of a hydraulic cylinder underneath, the znigleiidh can take control of the platform.

With transportable lifting devices, e.g. for loading and unloading of trucks, is the use of lifting cylinders that attack under -the let, not possible. Leading the application of side cylinders eats an even lifting all pistons are not guaranteed if the load is not evenly distributed. On the other hand, however, the hydraulic actuation is of advantage for larger load capacities around small Hdbwege considerable advantages through simple structure and low-cost.

There one: already facilities with series-connected lifting cylinders known, ibeiidenen in modification of the already mentioned B @ uua, rt the effect the unequal Koilibenflädh.en or loads on the first lifting cylinder following Htibzylinde-r for the purpose of a height equality of all Hul) zy linder is easy to find. -To achieve this, these lifting cylinders are on pressure valves different accessibility: additionally connected with a bypass line. In both of the known ihydrauli @ sdhieii processes mentioned above, is always the danger of a single verse: panning or twisting of the platform igegeheir, because in read cases the cylinder before the first read address one after the other and read the last the platform r @ m, from a fine tilted position to the other, geila: n @ ge @ ricl, is lifted.

In order to force the sliding of the Huibzylinders, one could do for everyone. Cylinders provide separate pumps that are driven together. This eats but expensive and cumbersome to operate because]), ei transportabl @ enm devices often one Separation between pump and lifting cylinder erfoir: derlidh, ist.

According to the invention, a uniform lifting of the load is easier than ever Structure of the lifting device @dadurdh achieves that with an arrangement of: four cylinders In the square, two diagonally positioned cylinders are connected one behind the other. Duiroh the juxtaposition of the cylinders becomes one. flawless lifting that Load with only one pump, possible. The lifting device is therefore .simple, operationally reliable -and cheap.

In the drawing is an embodiment of the invention, schematically darges; part.

The lifting device shown is used for loading trucks with piece goods used. The truck has two extendable carriers r, on each of which two Lift cylinder 2 are attached. The K, oilb-en @ s, tangen 3 of the idhen in the cylinders Koiliben 4 touched a platform 5 on which the piece goods are placed. Space 6 protrudes from two diagonally opposite cylinders: dien Piston 4 of the first cylinder 2 mimits the space 7 under the piston of the second a line 8 .in connection.

The rooms 6, 7 and the line 8 are filled with Filüs.sigkeit. The cylinder diameters are selected so that the cross-section of the first The cylinder has the same size as the ring surface formed by the piston rod of the second cylinder. The space 9 below the piston 4 of the first cylinder ä is other pumps @ pressure line io aingeschilossen.

When the pressure line is opened, liquid gets under the pillars 4 , the first cylinder 2 is pressed, lifting it up. This is done at the same time the liquid in the rooms. 6; 7 and set in motion in line 8, the the piston of the second cylinder lifts, the top of which at r i with the atmosphere there is a connection. So there is no smooth lifting of the platform.

Claims (1)

PATENT CLAIM: Hydrauti, s-che Voinricihtunig zum Herben in front of platforms, containers and the like, in which at least two lifting cylinders are held internally in such a way that the space above the columns of the first Cylinder with the space under the piston. is connected by a line and both rooms. with the line are filled with liquid, idaAby that: in the case of an arrangement of four cylinders in (2) in a square, two cylinders lying diagonally are connected one behind the other. Drafts referenced: German Patent No. 684 682; French patent specification No. 830 0i9.