Coupling device for a lower link of a three-point linkage
A coupling device for a lower link of a three-point linkage, including a coupling body with a catch hook for receiving a coupling element along a defined receiving direction, the coupling element being designed to complement a fastening region of the catch hook, and also including a locking mechanism with a locking latch, which is urged by a spring force into a locking position, in which the catch hook is locked, in which case a coupling element to be received by the fastening region can be arrested in the catch hook. The locking latch here is longitudinally displaceably mounted in a sliding guide, provided on the coupling body, such that it can be deflected out of the locking position exclusively perpendicularly to the defined receiving direction, thereby clearing the fastening region.
1 . A coupling device for a lower link of a three-point linkage, comprising:
a coupling body with a catch hook for receiving a coupling element along a defined receiving direction, the coupling element being of complementary design to a fastening region of the catch hook;
a locking mechanism with a locking latch, which is urged by a spring force into a locking position, in which the catch hook is locked, in which case a coupling element to be received by the fastening region can be retained in the catch hook, the locking latch mounted in a longitudinally movable manner in a sliding guide, formed within a housing provided on an upper side of the coupling body, in such a way that it can be deflected out of the locking position exclusively perpendicularly to the defined receiving direction, thereby clearing the fastening region, whereas the locking latch, when in the locking position, projects more than half way beyond the fastening region in the defined receiving direction, thereby performing a locking function, and the spring force provided via a helical compression spring having a first end received in a blind hole on an inner side of the locking latch and a second end supported on a maintenance cover of the housing;
a concave contact contour on the locking latch facing the fastening region and corresponding to an outer curvature of the coupling element, and a rising flank of the concave contact contour blocking pushing open of the locking latch by the coupling element when the coupling element is in contact with the concave contact contour; and
a guide rod attached to the maintenance cover running within the helical compression spring and ensuring that the helical compression spring is compressed without kinking when the locking latch is moved in the direction of a coupling position.
2 . The coupling device of claim 1 , wherein the locking latch is bevelled in such a way at an end lying in the receiving direction that it can be urged into a coupling position which clears the fastening region when the coupling element is introduced.
3 . The coupling device of claim 1 , wherein the housing has an access opening, which can be closed via a removable maintenance cover.
4 . The coupling device of claim 1 , wherein mutually aligned bores for receiving a securing bolt extend through opposing cheeks of the housing in such a way that a deflection of the locking latch out of the locking position can be blocked via the securing bolt.
5 . The coupling device of claim 1 , wherein a drainage opening for drainage of liquid is formed in the housing.
6 . The coupling device of claim 1 , wherein the sliding guide has an elastic stop element for limiting a longitudinal movement of the locking latch in the direction of the locking position.
7 . The coupling device of claim 1 , wherein a pull lever is attached to the locking latch, via which the locking latch can be deflected manually out of the locking position by an operator.
8 . The coupling device of claim 7 , wherein a latching device, via which the locking latch can be retained in a coupling position which clears the fastening region, is formed on the pull lever.
9 . The coupling device of claim 7 , wherein an eye for attaching an actuating cable is provided in an end region of the pull lever.
10 . The coupling device of claim 1 , wherein the locking latch is parallel to the sliding guide, which is parallel to the blind hole, which is parallel to the guide rod, which is parallel to the helical compression spring.