DE8713624U1 - Catch device on ploughs for trailing implements - Google Patents

Description

Catch device on ploughs for trailing implements

The invention relates to a catching device on plows for the transport of trailing devices according to the preamble of claim 1.

During the coupling process between the pulling arm of the plough and the catch arm of the trailing device, strong shocks occur as a result of the sudden acceleration of the stationary trailing device to the speed of the plough movement, which puts strain on the plough, including its connections to a towing vehicle, as well as the trailing device and causes signs of wear.

In order to reduce the shock loads, it is already known to equip the catch arm with a shock absorber. For this purpose, the catch arm is telescopically designed to be variable in length to a limited extent and a coil spring is provided inside the catch arm, which counteracts any extension stress. It has also already been proposed to provide such a shock-absorbing arm, aligned in the direction of pull, as a pulling arm on the plow.

The invention is based on the object of providing a safety device according to the preamble of claim 1 with a particularly simple shock absorption 2U The invention solves this problem with the features of claim 1, with regard to essential further embodiments

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Claims 2 and 3 referred*

The safety device according to the invention enables the pull arm to make a shock-absorbing, limited backward swinging movement during the coupling process with little construction effort, which significantly reduces the loads caused by coupling shocks. The external coil spring is easy to inspect and replace and its spring preload can be easily and simply changed by changing the free length of the tension rod, thus adapting it to different operating conditions. The easy replaceability of the spring also makes it possible to replace it with a spring with a different spring characteristic to adapt to different conditions that result from the type and weight of the trailing device. The design is also extremely low-wear and reliable in operation, as clamping effects or similar malfunctions are avoided.

In the drawing, an embodiment of the subject matter of the invention is schematically illustrated in more detail. In the drawing:

Fig. 1 is a schematic plan view of a plough with a safety catch and attached trailing device, and

Fig. 2 is an enlarged detail of detail II in Fig. 1.

The plough 1 shown in the drawing comprises a front attachment part 2 and a plough frame 4 which can be pivoted about a plough shaft 3 and on which the catching device 5 is supported. This catching device consists of a pulling arm ~> which is hinged at its inner end to the plough frame 4 at 6 and projects on one side in the operating position and which is braced towards the front end of the plough frame 4 via an inclined strut 8.

At its outer end, the pulling arm carries a driver 9 for the catch hook 10 of the catch arm 11 of a trailing device

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12 for soil cultivation/ which in the example shown is designed as a packer. The frame 13 of the trailing device 13 carries a catch arm 11 on both the front and rear crossbars, each of which is connected so that it can be folded around a joint with a vertical joint axis 14 or 15. The two catch arms 11 are connected by a pull rope 16 or similar connecting link for an alternating folding movement.

The diagonal strut 8 is connected to the traction arm 7 in an articulated manner at 17 (at 18 when the safety device is not in use) and is also connected at its front end to the front part of the plow frame 4 via a joint with a vertical joint axis 19. At its front end, the diagonal strut 8 has an extension part 20, which is formed by a tension rod 20, which is inserted into the end of the diagonal strut 8 and whose free length can be varied, and which passes through a connection eyelet 21 which forms the connection joint and which is supported on an attachment part 22 on the plow frame 4 so as to be pivotable about the joint axis 19. A helical compression spring 23 is arranged on the outside of the extension part 20, which is supported on the one hand on an abutment 24 at the end of the extension part 20 and on the other hand on the connection eyelet 21. The abutment 24 is formed by a ring body that is detachably attached to the end of the extension part 20 by means of a cross connector 25 in order to enable an easy, simple and quick spring change.

If, during its forward movement, the driver 9 of the pulling arm 7 comes into coupling engagement with the catch hook 10 of the catch arm 11 intended for taking the stationary trailing device 12, the pulling arm 7 can, against the effect of the helical compression spring 23, perform a limited return pivoting movement about its articulation axis 6, by which, in conjunction with the damping effect of the helical spring 23, the coupling shock is reduced accordingly.

Instead of the shock absorber arrangement provided in the illustrated embodiment between the front end j

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the diagonal strut 3 and the front end of the plow frame 4, such an arrangement can also be found in the area of the engagement of the diagonal strut ti on the traction arm 7. Furthermore, instead of an extension part 20 with a reduced cross-section, the end of the diagonal strut 7 can also be used directly as a carrier part for the screw compression spring 23.

Claims (3)

Expectations: 1. Anchoring device on plows (1) for the transport of trailing implements (12) for soil cultivation, with a traction arm (7) which is hinged at its inner end to the plow frame (4), in the operating position protrudes on one side, is braced via an inclined strut (8) towards the front end of the plow frame (4), and which has at its outer end a driver (9) for the catch hook (10) of a catch arm (11) of a trailing implement, characterized in that the inclined strut (8) is connected at one end to a connecting eyelet (21) on the plow frame (4) or on the traction arm (7) is provided with a slidingly extending extension part (20) and on this a helical compression spring (23) is arranged, which is supported on the connection eyelet (21) and on an abutment (24) at the end of the extension part (20). 2. Device according to claim 1, characterized in that the extension part of a into the end of the diagonal strut (8) inserted tension rod (20>, variable in its free length. 3. Device according to claim 1 or 2, characterized in that the abutment is formed by an annular body (24) detachably fastened to the end of the extension part (20) by means of a cross connector (25).