DK3050607T3 - MODEL TRACTOR WITH A CLUTCH FOR RECORDING AT LEAST ONE MOUNTING DEVICE AND / OR TRAILERS - Google Patents

Description

The invention relates to a model vehicle, in particular a model tractor, having at least one coupling for mounting at least one attachment item and/or trailer, wherein the coupling comprises at least one lower linkage and at least one upper linkage for fastening the attachment item and/or the trailer, and wherein the fastening point or points of the upper linkage and/or lower linkage is/are vertically adjustable.

Model tractors are known from the prior art to whose front side or rear side attachment items or trailers can be hitched. Such couplings have an upper linkage and/or a lower linkage that can be adjusted by corresponding guides and that permit a three-point connection to the object to be hitched. DE 10 2004 001294 U1 describes a model vehicle having a coupling for mounting a trailer, wherein the coupling comprises at least one lower linkage and at least one upper linkage for fastening the trailer, and wherein the fastening points of the upper linkage and/or of the lower linkage are vertically adjustable.

Construction variants individually exist in which the lower linkages can be adjusted or pivoted on a circular path by adjustment means to ensure a vertical adjustment of the fastening points to mount the attachment item. The upper linkage is as a rule manufactured from a part that has a passage hole at one end for fastening to the chassis of the model tractor. A hook is formed at the other end in which the attachment items can be latched. The upper linkage is also fastened to the chassis by a pin and can thereby move on a circular path.

There are large differences between the positions the attachment parts can adopt at different tractor types due to the different dimensions of the attachment objects that were implemented on previous tractors without standardization. It is extremely difficult due to the lack of standardization to design attachment items suitable for all tractors, which represents a substantial deficiency. A solution to avoid the aforesaid problems is based on fixed couplings having standardized connection dimensions. The rigid lower linkages and the chassis comprise a zinc part, the upper linkage is mounted as a plastic part fixedly to the chassis. The plastic offers a certain degree of elasticity to be able to mount the attachment items. This solution admittedly has the advantage that the attachment items always adopt the same position after the attachment to the tractor due to the standardization. The disadvantage is, however, that the different positions cannot be simulated during operation such as driving positions or use on a field. The attachment item can here only adopt one single fixedly prescribed position.

All the previous solutions for couplings, in particular for three-point power lifts, thus have the underlying problem that they do not permit any setting of the position vertically with hitched attachment items and that the inclination of the attachment items is generally not settable.

Starting from the previously described prior art, it is thus the underlying object of the present invention to further develop a coupling of the category such that it is not only vertically adjustable, but also allows an inclination adjustment of the attached object.

This object is achieved by a model vehicle in accordance with the features of claim 1. Advantageous embodiments of the model vehicle in accordance with the invention are the subject of the dependent claims.

In accordance with claim 1, a model vehicle, in particular a model tractor, is proposed that has at least one coupling for mounting at least one attachment item and/or trailer. The coupling comprises at least one lower linkage and at least one upper linkage, wherein both the lower linkage and the upper linkage are equipped with corresponding fastening points for mounting an attachment item and/or trailer. The embodiment of the lower linkage and/or upper linkage takes place such that the fastening points of the upper linkage and/or lower linkage are vertically adjustable.

Provision is additionally made in accordance with the invention that the upper linkage and/or the lower linkage is/are longitudinally adjustable. The possibility is thereby provided, in addition to a vertical adjustment, additionally to vary the inclination of the mounted attachment item and/or trailer. It is thereby possible to align different attachment objects at the chassis such that they adopt the predefined position. In addition, different operating positions such as the driving positions or the working position on the field can be simulated via the vertical adjustment.

The coupling using an upper linkage and a lower linkage is based on the model of a three-point power lift known from reality, wherein two fastening points of the attachment item are provided via the lower linkage and one fastening point is provided via the upper linkage. The lower linkages are in this respect connected in a pivotably articulated manner to the vehicle or to the chassis using horizontal pivot shafts, for example bolts or pins, oriented transversely to the direction of travel. Corresponding connection means, preferably latching hooks, are provided at the free ends of the lower linkages for the mounting of an attachment item and/or a trailer. They represent the lower two points of the three-point connection.

The upper linkage is preferably attached centrally further above the lower linkage and is likewise connected in a pivotably articulated manner to the chassis of the model vehicle via a horizontal pivot axle, preferably in the form of a pin or of a bolt. The free end of the upper linkage forms the third point for fastening the attachment item or trailer.

It is conceivable that the longitudinal adjustability of the upper linkage or of the lower linkage is implemented via a piston-in-cylinder unit. The upper linkage or the lower linkage is ideally completely formed by the piston-in-cylinder unit. It is preferred if the fastening point of the attachment item and/or trailer is disposed at the cylinder side. The cylinder bottom, for example, comprises a corresponding latching hook for mounting the attachment item and/or trailer.

There is generally the possibility of configuring both the lower linkage and the upper linkage as longitudinally adjustable. The preferred variant, however, provides that the upper linkage is longitudinally adjustable. The invention will therefore be explained in the following with reference to the preferred variant; however, the following advantageous embodiments can also be applied to designs with longitudinally adjustable lower linkages or with a combination of longitudinally variable lower linkages and upper linkages.

Provision is made in a preferred embodiment variant that at least one fixing means is provided at the piston-in-cylinder unit of the upper linkage for fixing the extension length of the piston rod. The extension length can thereby be fixed and the forces taken up can be introduced via the upper linkage into the chassis of the model vehicle. The fixing means is in particular based on a latching means at the cylinder side that engages into a corresponding catch connection at the piston rod. The latch connection is preferably configured such that a catch connection of the cylinder with different extension positions is made possible. The attachment item can thereby be operated at different angles of inclination at the model vehicle. The coupling can thereby be set universally to any desired attachment items.

The vertical adjustment, in particular the pivot movement of the lower linkage or linkages, is preferably effected via a lower linkage piston-in-cylinder unit. If more than one lower linkage is installed, it is conceivable that each lower linkage has its own lower linkage piston-in-cylinder unit or, alternatively, both lower linkages can be actuated via a common lower linkage piston-in-cylinder unit.

The lower linkage piston-in-cylinder unit in particular comprises at least one fixing means to fix the extension length of the lower linkage piston-in-cylinder unit. The fixing means is preferably configured in the form of a latching means for fixing the extension length. It is preferred in this case if the latching means is provided at the cylinder unit and is latchable to a corresponding catch connection at the chassis or at a chassis cover. A possible design for connection of the lower linkage piston-in-cylinder unit to the at least one lower linkage comprises the lower linkage piston-in-cylinder unit being connected in an articulated manner to the vehicle frame, on the one hand, and being fastened to at least one lift arm, on the other hand. The lift arm is pivotably mounted at the vehicle frame and is directly or indirectly connected to the at least one lower linkage so that an adjustment movement of the lower linkage simultaneously triggers a movement of the lift arm. The lift arm is particularly preferably upwardly pivoted by an adjustment movement of the lower linkage, whereby an extension movement of the lower linkage piston-in-cylinder unit is executed.

The connection between the lift arm and at least one lower linkage can take place, for example, by means of at least one connection strut.

Further advantages and properties of the invention will be explained in detail with reference to an embodiment shown in the Figures. There are shown:

Figure 1: a front view of the chassis including the coupling of the model tractor in accordance with the invention;

Figure 2: a side view of the chassis of the model tractor including the coupling;

Figure 3: a plan view of the chassis including the coupling;

Figure 4: a perspective side view of the chassis including the coupling;

Figure 5: an enlarged front view of the coupling;

Figure 6: an enlarged side view of the coupling including a part of the vehicle chassis; and

Figure 7: an enlarged plan view of the coupling.

Figures 1 to 7 show the chassis 2 of a model tractor in accordance with the invention including the coupling for mounting an attachment item and/or a trailer. Figures 1 to 4 in this respect show a total representation of the chassis 2, while Figures 5 to 7 reproduce enlarged shots of the coupling. The invention will be explained in the following with reference to these representations, with the reference numerals named in the following applying to all the Figures 1 to 7.

The design of the coupling is based on the principle of a three-point force lift. The component, also frequently called a three-point hitch, is located either at the rear side of the model tractor or also alternatively at its front side. The name three-point hitch is suitable since the attachment item is connected to the tractor at three points.

The representation shows a coupling mounted at the rear of the vehicle; however the design can be used without restriction for a coupling to the front side of the vehicle. The coupling design comprises two levers that are mounted low at the rear of the tractor and that extend in the longitudinal direction, i.e. in the direction of the vehicle. They are called lower linkages 1. The lower linkages 1 are fastened to the chassis 2 of the tractor pivotable about a horizontal axis using horizontal pins 12. Latching hooks 13 having upwardly oriented openings for receiving an attachment item are located at the free ends of the lower linkages 1. A further lever, that is called an upper linkage 14, is attached centrally above the lower linkage 1. The free end of the upper linkage 14 provides the third fastening point of the three-point suspension that is likewise designed as a latching hook 15 and whose opening faces downward.

The two lower linkages 1 are consequently fastened to the chassis 2 pivotable about a horizontal axis. The lift arm 4 is rotatably supported between the chassis 2 and the upper cover 3 of the chassis 2 so that it is likewise upwardly pivotable about a horizontal axis. As soon as the lower linkage 1 is upwardly pivoted, the lift arm 4 is actuated via the connection strut 5 and is likewise pivoted. If the lower linkage 1 is upwardly pivoted, an upward pivot movement of the associated lift arm 4 likewise occurs. A lower linkage piston-in-cylinder unit is connected in an articulated manner to the piston 7 at the support of the lower linkages 1. The cylinder 6 is operatively connected to the lift arm 4. The cylinder 6 fastened to the lift arm 4 is displaced upwardly in the vertical direction relative to the piston 7 guided in it by an adjustment movement of the lift arm 4. A snap-in connection of the cylinder 6 engages into the latching hook of the lower cover 8 of the chassis 2 so that the extension length of the piston 7 can be fixed. As soon as a force exerted by the attachment item acts on the lower linkage 1 from above, it is redirected to the cylinder 6 and is transmitted to the chassis 2 by the tightly fitted snap-in connection.

The upper linkage 14 comprises a further piston-in-cylinder unit whose piston 9 is fastened by means of a pin 10 to the lower cover 8 of the chassis rotatable about a horizontal axis. The assembly cylinder 11 of the upper linkage 14 is pushed on the piston 9. A hook 15 for the attachment of the attachment item is located at the cylinder bottom. The extension length of the piston rod 3 can be fixed via a further snap-in connection. The extension length of the cylinder 11 can thereby be fixed, with the latching means of the piston 9 permitting a fixing in different extension positions so that different angles of inclination of the mounted attachment item can be set.

The forces with coupled attachment items always act in parallel with the main axis of the upper linkage 14. These forces are likewise led off via the snap-in connection to the piston 9 and subsequently via the lower cover 8 to the chassis 2. The cylinder 11 of the upper linkage 14 can adopt a plurality of positions relative to the piston 9 due to the multiply attached latching hooks at the piston 9 of the upper linkage 14.

The presented coupling of the model tractor accordingly not only permits a vertical adjustability of the mounted attachment items via the lower linkage piston-in-cylinder unit 6, 7, but also allows a variation of the angle of inclination of an attached object via the adjustable length of the upper linkage 14. The coupling design cannot only be manufactured particularly simply, but also at low cost.

Claims (10)

A model vehicle, in particular a model tractor, with at least one coupling for accommodating at least one mounting device and / or trailer, the coupling comprising at least one lower drawbar (1) and at least one upper drawbar (14) for securing the mounting device and / or the trailer, and the attachment point or attachment points of the upper drawbar and / or lower drawbar can be adjusted in height, characterized in that the upper drawbar and / or lower drawbar can be adjusted longitudinally. Model queue tool according to claim 1, characterized in that the upper drawbar and / or lower drawbar comprise a piston cylinder unit, where the attachment of the mounting device and / or the trailer is preferably done on the cylinder side. Model vehicle according to claim 2, characterized in that at least one fixing means is provided on the piston cylinder unit for fixing the length of the piston rod, in particular in the form of a mechanism on the cylinder side, which engages in an engagement mechanism of the piston rod, in which a different fixation of the piston rod projecting positions are possible, preferably by means of the engagement mechanism. Model vehicle according to one of the preceding claims, characterized in that the upper drawbar and / or lower drawbar are rotatably coupled to the model queue, especially on the vehicle frame. Model vehicle according to one of the preceding claims, characterized in that the height adjustment, in particular the rotational movement of the upper drawbar or upper drawbar, comprises a piston cylinder unit with a lower drawbar. Model vehicle according to claim 5, characterized in that the piston cylinder unit with a lower drawbar comprises fixing means, in particular engaging means, for retaining the length of extension, whereby preferably the engaging means of the cylinder unit engage with an engagement mechanism on the chassis (2) or the lower cover. Model queue gear according to claim 5 or 6, characterized in that the piston cylinder is coupled to the lower frame with a lower drawbar on the one hand and on the other hand coupled with at least one lifting arm (4) and the lifting arm is adjustable, especially pivotally. at a height adjustment, in particular a pivotal movement, of the at least one lower drawbar, and raising the piston cylinder with a lower drawbar. Model vehicle according to claim 7, characterized in that the at least one lever is connected via at least one connecting strut to at least one lower drawbar. Model vehicle according to one of claims 5 to 8, characterized in that two lower drawbars are provided which are displaced relative to each other, whereby both lower drawbars can be respectively adjusted in height via a piston cylinder unit, in particular by means of a lever. . Model vehicle according to one of the preceding claims, characterized in that the lower and / or upper drawbar respectively comprise at least one engagement hook (13) for attaching a mounting device and / or trailer, where the engagement hook of the upper drawbar is ideally mounted on the piston cylinder unit. cylinder.