DK149404B - CLUTCHING MECHANISM FOR COUPLING A TRAILER AND A CLUTCHING EYE - Google Patents

Abstract

This device comprising a support fixed to the tractor and a hook like tying piece is characterized in that said support is a vertical plate and that said hook-like piece is integral of a carriage, slider or slide which can move reciprocatingly in a vertical rectilinear translation with respect to said vertical plate. This device allows the tying of tractor-drawn vehicles and farming tools.

Description

U9Å04

The present invention relates to a coupling mechanism of the type set forth in the preamble of claim 1. More particularly, the invention relates to a coupling mechanism for mounting to the rear of a towing vehicle for coupling an implement, the coupling-05 mechanism being of the type where the hook-carrying member is displaced along a vertical line from the position where the hook engages the tow eye. , to the connection position.

The invention is not merely directed to a universal mechanism which allows automatic coupling of either a trailer with one or two axles or an agricultural or construction machine or a worn working tool, either directly or by means of a pivotable swivel drawbar known per se. but more importantly, the invention provides a safety device for coupling mechanisms of the aforementioned kind which automatically operates and prevents any unintentional disconnection.

German Patent Specification No. 1,059,297 discloses a clutch mechanism which includes a vertical guide bracket attached to a towing vehicle and a slider which is displaced vertically in the guide bracket and carries a pin adapted to engage a clutch eye on the end of a tool drawbar.

The drawbar is lifted by the slider as it is raised to a raised position and in the raised position the pin is passed through a hole in a fixed bracket.

In order to obtain a lock in the raised position, 25 pivot locking mechanisms are provided, either in the form of a pivotable latch mechanism which locks the slider in relation to its guide bracket, or in the form of a pivotal locking pin arranged in connection with the tap hole. in the fixed bracket and must engage a recess at the end of the coupling pin as it passes through the pin hole.

The latching mechanism or locking pin is held in the locked position by a spring and is released in the opposite way by actuation through a rod mechanism or cable.

During connection, the operator must synchronize two maneuvers, namely the raising of the hook-carrying member and the simultaneous opening 35 of the locking mechanism. Obviously, synchronization is difficult because the switching mechanism is out of sight of the operator.

Furthermore, the automatic locking function of the structures used is 2 14940Λ vulnerable to soiling and rusting, and if the mechanisms are to function reliably, frequent and thorough inspections and maintenance are required. In addition, the locking mechanisms of a flimsy construction, the manufacture of which is also complicated, are 05, for example requiring the milling of several recesses of a rather special shape.

With the coupling mechanism according to the invention, characterized in that in the characterizing part of claim 1, an effective remedy for the above-mentioned drawbacks is obtained, the special locking mechanism being of simple construction and without difficulty can be designed very robustly.

In addition, the automatic operation of the locking mechanism is significantly less vulnerable to dirt and rust and does not require precision in operation during connection.

In the following, the invention will be described in more detail from embodiments and with reference to the drawing, wherein Fig. 1 is a schematic view showing a coupling mechanism according to the invention in a submerged gripping position, Fig. 2 is a sectional view of the coupling mechanism, and Figs. of two variants of controls for a safety lock which prevents accidental decoupling.

As can be seen in Figures 1 and 2, the mechanism in question includes a mounting bracket 1 attached to the rear portion 2 of a tractor, and a carriage or slider 3 is terminated at a lower end of a hooked or hooked portion which is constituted by a footpiece 4 which is a carrier for a vertical pin 5 adapted for insertion into a ring or eye 6 of a tow bar 7 on a towed vehicle or implement.

The carriage or slider 3 can perform vertical and rectilinear transverse movements relative to the mounting bracket 1 under the influence of either the usual lifting arms found on most tractors (not shown) or, better yet, under the influence of hydraulic or pneumatic cylinders, such as the cylinder 8b (Figure 2) located at the sides.

As a result of this translation movement, the pin 5 (Figure 2) is shifted from the low or submerged position A to grip the drawbar eye 6 and to a high or raised towing position B.

U9A0A

3

As shown in Figure 1, the pin 5 remains visible to the driver in these two outer positions, even if the driver is in a cab, always provided with a low-sided pane allowing the driver to see the ground in a zone umid-05 divisible by the wheels.

In a preferred embodiment, the carrier bracket 1 fixed to the tractor forms a kind of sliding guide in which a movable piece 3 (sled, slider or slider) can slide vertically.

The mounting bracket 1 is shown with a generally U-shaped cross-section formed by a plate 1a rigidly attached to the towing vehicle and connected to two side flanges 1b, and angular rails 1c are welded partly on the plate 1a and partly on the flanges 1b to form a sliding guide on each side of the mounting bracket.

The carriage or slider 3 is formed of two vertical side plates 15, which are connected to the horizontal foot piece 4, which carries the coupling pin 5. Each of the side plates slides in one of the sliding guides just described.

Of course, the construction described can be varied in different ways. For example, the sled may contain support rollers 20 which run inside each slide guide.

As a further example, the hook or hook portion may be formed by replacing the unit 4, 5 with a conventional towbar, but this solution will be less good as it will cause the mechanism of the invention to lose part of its 25 universal applicability as it will no longer be possible to take up ° a swivel drawbar of the usual type.

In one embodiment, which will now be described in connection with Figure 2, the footpiece 4 carries on its underside partly a tab 8 at the front end of the footpiece and partly a guide 9 at the rear end of the footpiece 30.

This guide 9 is formed between the foot piece itself and an arch 10, which is attached to the foot piece 4 at the sides.

The pivot pull boom 0 shown in FIG. 2 is inserted into the guide 9 and rests on the arc 10, with which the pivot boom can be assembled in the usual manner by means of a peg, while the pin 8 is inserted into a suitably designed eye 0a in the boom which is held up by a head 8a on the pin.

149404 4

The carriage or slider 3 has in the vicinity of the base 4 and on each side a maneuvering shaft 11, to which are connected either the ends of the usual lifting arm of the tractor or the end of the piston rod 8c in a cylinder 8b, the housing of which is connected to the flanges 1 mounting bracket 1.

After the lifting is induced, the slider's immersion can in principle be carried out by means of the weight.

Safety standards prescribe that the hook or garden area must be positively locked during the towing period. To meet this requirement, the slider 3 or, rather, its footpiece 4 carries at least one side pin 12 which is adapted to work with a gripper hook 13 which can pivot about a pivot pin 14 on the flanges 1b.

The gripper hook 13 is held in position for capturing the pin 15 12, for example by means of a spring 15, which actuates a tilting arm 16 connected to the pin 14 or the gripper hook 13.

The retraction of the gripper can be effected by turning about the pin or shaft 14 at some point before the coupling, when the pin 12, which is lifted together with the slider 3 and the footpiece 4, hits the outside of the gripper which forms a cam surface 13a.

This withdrawal can also be induced in one of the? In the following, when you want the slider to be submerged again by means of gravity either to release the drawbar eye 6 elves to allow for the connection of another drawbar.

Figure 3 shows an embodiment in which the gripper hook 13 is too connected to one end of a rocker arm 17, the other end of which may be influenced by a control system, for example a Bowden-type cable 18.

It will be seen that a feature of this cable causes a pivot of the arm 17 about the shaft 14 and, consequently, a pivot of the gripper hook 13, which can thereby release the pin 12.

In the embodiment of Figure 4, the core of an electromagnet 19 is pivotally connected to the end of a rocker arm 20, which is connected to the shaft 14 or to the gripper hook 13. An activation of the coil in this electromagnet causes a pivot of the arm 20 and thus also a pivot. of the gripper in a direction which releases the pin 12. A spring counteracts the electromagnet to

Claims (2)

149404 return the gripper to its catch position. The electromagnet 19 can, of course, be replaced by a pneumatic or hydraulic cylinder. Advantageously, the coupling mechanism is provided with a catch-chuck-05 mechanism such as that described on each of the flanges 1b, so as to form a double fuse which prevents accidental uncoupling. Moreover, when they are exterior to the structure, the catches 13 constitute a visible sign which enables control of the active position of the catchers as prescribed by certain regulations. The coupling mechanism according to the invention is particularly useful for agricultural tractors or for construction machinery. 1. Coupling mechanism for coupling a towing vehicle and a coupling eye (6) to the end of a towbar (7) of a trailer by means of a hook (4) provided with a hook (4) on a moving element (3) (sled, runner) or slider) which is adapted to be displaced back and forth along vertical lines of motion relative to a fixed portion or mounting bracket (1) carried by the tow vehicle, from a low or submerged position (A) to grip the coupling eye ( 6) and to a high or raised coupling position (B), in which a contrast piece holds the coupling eye in the hook or tap piece (4) and where an unintentional immersion of the hook or tap piece is prevented by a lock which is automatically activated to holding the piece (4) in its raised position, characterized in that said lock contains a gripping hook (13) which is pivotable in a vertical plane about a horizontal shaft (14) supported by said fixed portion (1), which gripper hook (13) is adapted to work 30 along with a horizontal locking pin (12) supported by one of the vertically movable members, the chin being force-pressed against the locking position and having a cam surface. (13a) which, when actuated by the pin (12), is forced to the side until the chin can engage. 2. A mechanism according to claim 1, characterized in that the pivotal gripper hook is actuated in the direction of its engagement or locking position by a spring (15) which counteracts means for positive extension of the gripper hook.