CS200833B1 - Automatic suspension for the trailers of the motor vehicles particularly tractors - Google Patents

Description

The invention relates to an automatic hitch for trailers of motor vehicles, in particular tractors, and to a locking device of a locking pin in its upper position.

Known embodiments of the automatic hinges are generally of such construction that its locking pin is held in the upper raised position by a latch and is lifted by the drawbar eye of the yarn inserted into the guide nozzle, releasing the latch which holds it.

The disadvantage of these embodiments is that they require a single operation to disconnect the trailer, whereby the locking pin must be raised to the upper locked position to allow the drawbar of the trailer to be withdrawn from the homing nozzle. The second manipulation action is needed to prepare the automatic hitch for further coupling, in which the closing bolt must be lifted again to the upper locked position because it was lifted, released and lowered by the spring spring to the lower position when the trailer was previously uncoupled.

Still other embodiments of the self-hinge mechanisms are known, wherein the drawbar eye acts on a separate release lever extending from the self-hinge mechanism space into the open space of the guide nozzle which controls the lowering of the closure pin. Even these embodiments do not eliminate the need for one mahipulation needed to prepare the automatic hitch to attach the trailer. In addition, there is a further disadvantage of this embodiment, in which the release lever extends from the mechanism space into the open space of the homing hubs and thus

200 833 violates the tightness of the mechanism compartment against dust, water and other contaminants.

The above disadvantages are overcome by the automatic hinge according to the invention, which essentially consists of a locking pin which in the lower part extends into the guide nozzle space and is provided with a lower recess for the release lever mounted pivotably in the guide nozzle space.

An advantage of the arrangement according to the invention is the removal of the manual handling required to raise the locking pin to the upper position, which must follow the uncoupling of the drawbar of the trailer in the above-described and known embodiments. Another advantage is the possibility of closing the self-hinge mechanism against dust and other contaminants, since the release lever securing the locking pin in the second upper position is housed in the open space of the guide nozzle.

In the accompanying drawings, an automatic hinge according to the invention is shown in which, in Fig. 1, the closure pin is in the first upper position when disconnected, Fig. 2 is lowered, and Fig. 3 is in the second upper position prior to coupling.

The automatic hinge consists of a body 1, to which a box 2 containing its own automatic mechanism and a guide nozzle 2i are fixed, to which a guide sleeve 4 is pressed into the lower part of the body 1. In the housing 2 there is slidingly mounted a locking pin which is moved through the eye of the drawbar 20 to the lower position on the guide sleeve 8, furthermore the control lever 10, which is firmly connected and with the lifting thumb 11 provided with the supporting jaw. the swinging supports 15 are supported on both sides, on which there is nothing, with one side of the main spring 16, which are fastened to the housing 2 by the other side,

An upper recess 6 is formed on the locking pin 2 ®; In the form of an open through groove into which the lifting pin 8 extends, fixed by its ends in the closing pin In the lower part, the closing pin 2 is provided with a lower recess χ. Above the upper surface of the locking pin 5, a compression spring is attached to the housing 2 At the end of the lifting thumb 11, recesses 12 and a supporting surface 13 are formed and the entire end thus arranged is received in the upper recess 6 between its lower surface and the lifting pin 8. In the open space of the guide nozzle 2 is pivotably mounted on the pin 18 the release lever 12, 4 ', 4' 'and 10' 'with the spring 19.

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200 033

In the second upper position, the locking pin 4 is fixedly fixed and at the same time ready to be reconnected to the drawbar eye 20 without manual manipulation.

Subsequent attachment of the trailer occurs after the release lever 17 has been tilted by the drawbar eye 20 from the lower recess 2 of the closure pin 2 ^{and the} closure pin 8 is pushed into its epode position by the force of the main springs 16.

Claims (3)

1. An automatic hitch for trailers of motor vehicles, in particular tractors, consisting of a body to which is attached a draw-in nozzle for the drawbar eye of a trailer which engages one end of a locking pin and together with a lifting thumb stowed in the box; nozzle, characterized in that the closing pin (5) in the lower part extending into the space of the guide nozzle (3) is provided with a lower recess (7) for the release lever (17), pivoted in the space of the guide nozzle The automatic hinge according to claim 1, characterized in that a spring (19) anchored to the wall of the body (1) is supported on the release lever (17). An automatic hinge according to claim 1, characterized in that the release lever (17) is mounted on a pin (18) anchored in the body (1).