DE944587C - Coupling device for coupling attachments or attachments used for agricultural soil cultivation - Google Patents

Description

(WiGBl. P. 175)

ISSUED JUNE 21, 1956

p 2899111145a

The invention relates to such known coupling devices for coupling of attachments or attachments used for agricultural tillage, where the coupling mouth is attached to the tractor or towing vehicle, on which a spring force held in the closed position, ^{absorbs the tensile forces 1} and when coupling through the pressure of the link to be coupled opening pawl is rotatably acted gel.

With such couplings, the closed position the pawl absorbing the tensile forces is canceled by a special device when uncoupling and held in the open position. With a trailer coupling for tractors with a vertically displaceable coupling bolt, it is known that with the Coupling bolt articulated locking member by a locking lever in the open position to hold until the lock is released by inserting the link to be coupled and the The locking element brings the coupling bolt into the locking position by spring force. This will be done for each the two positions of the locking member each have a spring effective and a special locking lever as well as precisely centered slideways provided in the coupling housing.

In contrast, the coupling device according to the invention is simple in construction and safe in the mode of operation, since no springs and only one locking member is required for the locking device will.

The invention consists in that the manually operated, the pawl in the open

Position retaining locking device as a pivotable about an approach of the pawl, laterally of the coupling jaw arranged plate is formed when lifting the pawl slides with a guide surface on the drawbar and in? the raised position in a Rest is held.

With a locking device designed in this way, only one handle is required for unlocking the coupling, as after the member to be coupled has slid out of the coupling mouth the locking lever automatically assumes its locked position again. The operator needs So don't worry about the clutch any longer. It is always ready to be engaged again ready.

In the drawing, an exemplary embodiment of the invention is shown in FIGS. 1 to 3 schematically shown, where

Fig. Ι a side view of the coupling device shows in coupled condition;

Fig. 2 is a view at a braid angle thereto, during

Fig. 3 shows the coupling device in the uncoupled state.

Here, 1 is the one on a soil cultivation device, for example attached drawbar. The coupling mouth 3 is attached to the tractor by means of a pipe 2, in which a pawl 4 is rotatably mounted about the axis 5. This pawl has a shoulder 6 which is fastened with a bolt 7 is supported against a helical spring, which is an abutment on the lower side of the coupling jaw 9 has. The pawl 4 also carries © inen approach 10, on which on a pin 11 a plate 12 is pivotably mounted. This plate has a; Curved surface 13 and can by means of the handle 14 are moved. In order to be able to effect this movement from the seat of the tractor expediently attached to the end 15 of the handle 14, a chain or cord.

If the handle is moved in the direction of the arrow, then the surface 13 slides on the edge of the drawbar ι along and lifts the pivot point is connected to the plate 12 pawl 4 so far (Fig. 3) until the plate 12 with the last as a latch acting part 14 is supported on the coupling 13. The coupling device is now open and allows the tractor to be separated ^{from the attachment 1 or attachment by moving the tractor forwards.}

After the separation, the plate 12 with the part 14 no longer has any contact with the rail 1, and the pawl 4 falls down again, following its weight. If the tractor is to pick up the device again, it drives backwards to this, the flax 4 _{a of} the pawl 4 slides under the pressure of the drawbar 1 up until the drawbar ι has completely penetrated the coupling, and then automatically falls into the closed position.

The compression spring 8 has the effect that the pawl cannot bounce upwards when it hits uneven terrain, but is always held in the closed position. This also contributes to the fact that the surface _{46 of} the pawl 4 is higher than the pivot point 5, so that a certain locking effect occurs.

Claims (1)

PATENT CLAIM: Coupling device for coupling attachments or attachments used for agricultural soil cultivation with a coupling jaw attached to a tractor or towing vehicle, on which a locking pawl, which is held in the closed position by spring force, absorbs the tensile forces and opens when the link is coupled, is rotatably mounted, characterized in that the manually operated locking device holding the pawl (4) in the open position is designed as a plate (12) which can be pivoted around a shoulder (11) of the pawl (4) and is arranged to the side of the coupling jaw (3) , which slides when lifting the pawl with a guide surface (13) on the drawbar (1) and ip in the raised position. a latch (14) is held. Cited publications: German Patent Specifications No. 436704, 678088; Swiss patents No. 250 016, 223487, 89389; U.S. Patent No. 2,393,657. 1 sheet of drawings 1 609533 6.56