DE8117929U1 - "Liftgate for trucks or the like." - Google Patents

Description

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Description 502 GM

The invention relates to a loading platform for trucks or the like., the platform of which is pressurized by means of at least one pressure medium in one direction u / irksamen, articulated by a releasable valve switchable (releasable) hydraulic cylinder movable lifting device is.

With such tail lifts, which have become known several times in practice there is the disadvantage that for medium regulation and compliance with trade association regulations (in particular VBG 14) required facilities in building-intensive (cumbersome) and expensive way are assigned to the respective hydraulic cylinder.

The invention is therefore based on the object of creating a tail lift with a simplified hydraulic cylinder system, which the employer's liability insurance association safety requirements in accordance with VBG 14 and in the event of a malfunction-related cylinder blockage enables a relatively quick removal of the blockage.

According to the invention, this is effective in one direction Hydraulic cylinder reached, on whose cylinder pot (cylinder tube) in particular a connection block connected to a pressure line is screwed on the jacket side, which receptacle for the releasable valve (release valve), a flow control valve as well as a pressure switch.

In the case of a tail lift with such hydraulic cylinders (at least "Lifting cylinders") is due to the combination of the release valve (for example, solenoid valve), flow control valve and pressure switch in a common connection block each an extremely simple and secure; as well as inexpensive Hydraulic cylinder system available.

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There is a simple design because the various regulating and securing means are now wireless, i.e. without additional ones Pipe or hose pieces, attached to the connection block, in particular screwed in, are and / or are in turn is connected in a screw connection with the cylinder pot and a pressure line. Not necessary due to the connection block thus many otherwise required / usual items for the arrangement the aforementioned regulating and securing means, resulting in material and / or assembly time savings, ultimately also an economical production results.

The summary of the regulatory and safety tools required on a common connection block also has the advantage in the event of a malfunction-related cylinder blockage that not all relevant facilities on the way (outside of a special hydraulic workshop) point to a source of error examined or must be replaced one after the other, but it can be the connection block in a time-saving manner with the regulating and safety units arranged thereon are exchanged as a whole, which saves working time Re-use of the tail lift is made possible in a very short time. The connection block change can be carried out quickly and easily because there are only a few screw connections, namely those for terminal block mounting as well as pressure line connection. The often time-consuming troubleshooting can be done with the Training takes place in the workshop / hydraulic special workshop.

Since there is no risk of damage between the pressure switch and the cylinder pot underlying pipe or hose line, but only the one in a stable design with a corresponding flow channel provided connection block is available, is also without so-called. Pipe rupture protection (or other suitable securing means) maximum security guaranteed.

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In a preferred embodiment, the pressure line connection opens of the hydraulic cylinder connection block into a flow control valve connection and release valve connection as well Cylinder connection and pressure switch connection existing channel cross, in particular in one containing the flow control valve connection Channel part, M / elcher in one of the release valve connection containing channel part passes from which on the one hand the cylinder connection and on the other hand the pressure switch connection branches off.

The subject matter of the invention extends not only to that individual characteristics, but also on their combination.

An exemplary embodiment of the invention is shown in the drawing and is explained in more detail below. Show it:

Fig. 1 is a schematic side view of a tail lift with height adjustable and swiveling by means of hydraulic cylinders Platform, whereby at least the lifting cylinder (s) is provided with a connection block,

Fig. 2 is a side view of a connection block mounted on a cylinder tube with screwed therein Check valve, flow control valve and pressure switch,

Fig. 3 shows a longitudinal section through the same connection block and

Fig. 4 is a plan view of the same terminal block.

A tail lift according to the invention for trucks or the like. has a platform 1, which is supported by a parallel lifting device 2 is carried, which can be moved in height by means of at least one hydraulic cylinder designated as a lifting cylinder 3. In addition to a lifting platform function, this platform 1 can also have a Exercise locking flap function and can preferably be used for this purpose by means of at least one hydraulic cylinder designated as a lock cylinder 4, by means of an electromechanical one Drive unit and / or manually around a horizontal pivot axis 5 pivot relative to the lifting device 2.

On the cylinder pot 6 of the hydraulic cylinder 3, 4 (at least the lifting cylinder 3) there is a flow connection in the area near the cylinder base arranged to the cylinder chamber having the piston or the inner piston end receiving the connection block 7, preferably releasably attached to which a pressure line is releasable

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connected, preferably fastened in a screw connection. The pressure line connection is numbered 8.

Except for the pressure line connection 8 and one to the cylinder space leading, as a cylinder connection designated channel (part) (9) and / eist the connection block 7 a receptacle 10 for a numbered 11 releasable valve (release valve, for example electromagnetic check valve), a receptacle 12 for a flow control valve 13 and a receptacle 14 for a pressure switch 15 on.

/ · "The pressure line connection 8 of the hydraulic cylinder connection block 7 opens into a "channel cross", the individual channel parts of which are at the outer end as flow control valve connection 12, release valve connection 10, cylinder connection 9 and pressure switch connection 14 are executed. The four canal parts of the canal cross are preferably in one plane and the duct part containing the pressure line, connection 8 extends in a transverse position this level. In a particularly preferred manner, this extends Canal cross on the plane of symmetry of a cuboid block (Housing), which receives the pressure line on one long side - the pressure line connection 8 opens into the flow control valve connection 12, which merges into the release valve connection, from which on the one hand the cylinder connection 9 and the other

On the other hand, the pressure switch connection 14 branches off.

The connection block 7 is preferably fastened to the cylinder pot 6 in a clamping connection, i.e. in a non-positive manner. In this case, im Area of the block-specific cylinder connection channel numbered with 9, in particular in a receptacle (centering receptacle) 7b, in a positionally stable manner arranged seal 16, preferably a squeeze ring, provided and the connection block by means of at least one, preferably two the connection block approximately at right angles to his. Plant surface 7a penetrating screws 17 attached.

In the case of hydraulic cylinders 3, 4 connected in pairs, it is
the arrangement of a flow control valve 13 and / or pressure switch
15 only required on one of the two hydraulic cylinders - the
Unnecessary receptacle 12/14 of the corresponding connection block 7 is closed by means of screw plugs.

In the case of lifting cylinders 3, the pressure switch 15 serves as a pulse generator for an electrically controlled platform inclination to tilt the platform into a position that forms a wedge-forming position and switches
therefore if there is a pressure drop in the cylinder chamber. Unless a mechanical
Platform inclination device is present, the pressure switch 15 is unnecessary and the corresponding receptacle 14 in the connection block 7 is closed by means of screw plugs or the like.
On locking cylinders 4, the pressure switch 15 serves as an overload protection device and is accordingly designed in such a way that it
switches off when a specified pressure value is exceeded
and prevents the tail lift from moving further. Depending on the application, the pressure switch 15 is therefore designed either as a switch that responds to a pressure drop or to a pressure increase.

The release valve numbered 11 is preferably of an electromagnetically releasable valve (2-way solenoid valve)
formed, but can also be designed to be hydraulically unlockable. The first-mentioned version is preferred for single-acting hydraulic cylinders, whereas the second-mentioned design is useful for so-called double-acting hydraulic cylinders (which are nevertheless switched to become single-acting).

The connection block 7 can be on the cylinder wall (which is then reinforced accordingly) or on the bottom of the cylinder pot
forming part be screwed.

Claims (7)

-1- June 16, 1981 Applicant: WILHELM STOLL Maschinenfabrik G.m.b.H. 3325 Lengede / Broistedt Our file: 502 () Title: "Loading platform for trucks or the like, claims 1. Liftgate for trucks or the like., The platform on one by means of at least one effective in one direction, switchable (unlockable) by an unlockable valve Hydraulic cylinder movable lifting device is articulated, characterized by hydraulic cylinders (3, 4) with in particular on the cylinder pot (6) screwed on the shell side, connected to a pressure line (8) connection block (7), which Recesses (10, 12, 14) for the releasable valve (release valve) (11), a flow control valve (13) and a pressure switch (15). 2. Loading platform according to claim 1, characterized in that the pressure line connection (8) of the hydraulic cylinder connection block (7) into a flow control valve connection (12) and release valve connection (10) as well as cylinder connection (9) and pressure switch connection (14) existing channel cross, in particular in the flow control valve connection (12) opens. 3. Loading tailgate according to claim 1 and / or 2, characterized in that that the pressure line connection (8) of the hydraulic cylinder connection block (7) opens into the flow control valve connection (12), u / elcher merges into the Entsperrv / antilanschluss (10), from which on the one hand the cylinder connection (9) and on the other hand the pressure switch connection (14) branches off. 4. Tail lift according to one or more of claims 1 to 3, characterized in that the hydraulic cylinder connection block (7) with the interposition of a duct (cylinder connection) (9) leading to the cylinder (chamber) fixed arranged seal (16), in particular transverse ring, by means of at least one (e.g. hollow screw), preferably two screw (s) (17) is attached to the cylinder barrel. 5. Loading platform according to one or more of claims 1 to 4, characterized in that the hydraulic cylinder connection block (7) is designed as a cuboid housing part. 6. Loading platform according to one or more of claims 1 to 5, characterized in that the four channel parts (Pos. 9,10,12, 14) of the "channel cross" lie in one plane and a channel part containing the pressure line connection (8) in a transverse position runs to this plane. 7. Loading platform according to one or more of claims 1 to 6, characterized in that the "channel cross" on the terminal block plane of symmetry is provided.