DE1457670A1 - Three-point hook coupling for agricultural tractors - Google Patents

Description

U57670 '

Ernst Conrad Helmstadt / Baden, Asbacherstrasse 30.

Three-point hook coupling for agricultural tractors,

The invention "relates to a three-point hook coupling for agricultural tractors, with hydraulic or the like. Liftable and lowerable, handlebar-like tow arms for coupling agricultural equipment are. The purpose of the invention is to simplify the process of coupling and uncoupling devices so that this can be done without Participation of an assistant by the tractor driver from the tractor can be made from. The most common way of coupling devices to the tow arms is that the ends of the Tow arms, in which ball joints are arranged, via appropriate Bolts on the front part of the device to be coupled are pushed and secured. The postponement happens from the side, the fact that, due to uneven ground, the tractor and implement are often inclined to one another from the vertical, requires the work of an auxiliary who attaches the joints, while the tractor driver has to maneuver accordingly. Suggested wnr-de already to simplify this at the ends / '

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the sliding arm and the top link of the tractor have a triangular frame to store the one on the upper and 'the lower coupling; points hooks into which the tows) οIzen the device be hooked. It should be achieved by being drive with the hooks of the tow arm under the device, from the tractor lift up the tow arm and thus connect the device from the tow: The opening of the towing hook of the top link was directed upwards. The coupling process turned out to be very difficult, regardless of the classification of the towing hooks rig, as it required extremely precise maneuvering because the towing bolts on the device only engage in the hooks within a very small area in the longitudinal direction of the towing arms could. This was particularly difficult when the tractor and implement were tilted to the side, as is the case in a farm Borrowed operation, however, is the rule. Added to this is the fact that the one arranged between the towing arms and the top link Triangular frame that makes coupling all such devices possible, which, like in particular the turning and head pieces of plows, more or less far over the iochleppbolzen of the device to the front protrude. The coupling of farm wagons was also made more difficult Etc. to the usual coupling of the tractor provided for this purpose, because then the triangular frame removed for this purpose, carried separately, on the field for the attachment of devices again attached and had to be removed again on the way home.

According to the invention, these difficulties are avoided by that the free ends of the lower links or tow arms, which can be adjusted and locked in their lateral distance, and the freely movable

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oerlenkers without mutual connection of the upper link with the wishbones with upward or downward pointing in the direction Tow open to the tractor and freely accessible from this side aken are provided, each of which is preferably a spring-loaded 3 Locking pawl carries. Bs is particularly advantageous if the Adjustment device for the lateral distance of the lower links or jhlepparme away from the hook ends in the area of the hydraulic lock of the tractor is arranged to thereby create a maximum of ι free space between the tow arms for the protrusion of to create divide work. There can also be a linkage, chain hoists or the like that can be used by the tractor. for the actuation of the locking pawls of the tow hooks should be provided. -Ch can also be used in this operating linkage or in the chain Be arranged springs. In the case of a gear arrangement on the locking pawls of the towing arms, this can ^ rod also be designed so that it is the adjustment device ir represents the side distance of the öchlepparme or lower link.

ι the drawing is the subject of the invention in a schema - . See disgraceful representation reproduced.

. The rear end 1 of an agricultural tractor is the hydraulic block 2, which is known in its structure, underneath or in its lower part Part of the lower links or tow arms are gela like a ball joint rt. These tow arms can by the hydraulic device that. for this purpose via two hats mounted on a common shaft at 4, which has the linkage 5 vonvelchem at least one is variable, raised and lowered. Above the

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U57670 ■

Tow arm 3 is preferably the upper link 6 on the hydraulic block 2 spherically supported, this link likewise being designed to be variable in length by means of a rotating sleeve 7.

The towing arms 3 are provided with towing hooks 8 at their ends, the hook opening of which is directed obliquely upwards towards the tractor. The upper link 6 also has a SchleÄkaken 8 at its free end, the opening of which, however, is advantageously directed obliquely downwards towards the tractor. All tow hooks 8 are provided with locking pawls 9. In the tow arms 3, as shown, the locking pawls 9 can be operated by a lever 10, which is guided along the tow arms 3 ″ up to the vicinity of the hydraulic block 2 and there are connected to one another by a cross piece 11. This cross piece can in its longitudinal axis be designed to be adjustable, so that thereby the lateral spacing of the trailing arms 3 change and adjust. at the cross-piece 11 is then a traction chain 12 arm shows _a CHT, the e <3 allows, by means of the lever 10 9 to operate the locking pawl. a reiterer chain 13 is led to the locking pawl 9 of the upper link 6, leather 14 can be provided in both chain hoists. Due to the far back connecting piece 11 there is enough space between the tow arms to allow protruding parts of the implement to enter between the tow arms is, by the way, the known Kupp, not shown in the drawing Management device for attaching farm wagons Completely free, accessible without any 'files of the three-point hitch for the farm implements having to be removed beforehand.

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¹ * '' H5767O

The coupling of agricultural implements is designed with the invention Execution of the hook coupling unusually simple. The tow arms 3 are lowered accordingly and the tractor passes under the front part of the device to be coupled with the arms 3 The tow arms are then raised, with an inclined agricultural implement inevitably facing the tractor aligns. The tractor then moves forward slowly, with the towing bolts of the device on the upper edge of the towing arms 3 slide and finally fall into the tow hook 8 of the lower link. During this slow advance of the tractor; The previously raised and roughly aligned upper link slides on the upper towing pin of the device to be attached and engages sohliesslich with its tow hook 8 in this bolt. The pawls then lock the into the completely self-actuated Tow hook engaged bolt. The free space on the upper side of the tow arm 3 in the direction of the tractor over a greater length offers the advantage that coupling can also be carried out without further ado can take place when the agricultural implement is inclined in the longitudinal direction to the tractor. It is then only one bolt at first click into place and when the tractor continues to be pulled, the arable implement Align lengthways until the other towing pin is in thinks of the other tow hook.

To uncouple the device, the tow arms are raised. The chains 12, 13 are then hooked in and the slipping arms are lowered again, the locking pawls 9f releasing the towing bolts of the device that are locked into the towing hooks 8. Whenever necessary, a brief push back of the tractor is sufficient to unhitch the implement. 909822/0 369 _c

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. ' H57670

Of course, instead of the mentioned "known Towing bolts on the arable implement also balls in a manner known per se be arranged as a connecting link without this' changing anything on the subject of protection. It would then be just that anders.en tow hook 8 and possibly the locking pawls 9 corresponding to the spherical shape of the connecting link adapt, so as ball sockets or the like. to train · Also in In the case of the spherical socket-like design of the tow hook 8, devices could still be hooked in, which in turn have the towing bolts mentioned.

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Claims (5)

H5767Q patent claims 1) jjbreipoint hook coupling for agricultural tractors with hydraulic, or the like liftable lower links "or towing arms for coupling agricultural implements, characterized in that the free ends of the can be adjusted and locked in their lateral distance Lower link or tow arm (5) and the freely movable upper link (6) without mutual connection of the upper link with the lower link with upward or downward in Towing hooks (8) that are open towards the tractor and freely accessible from this side are provided, each of which has one preferably spring-loaded locking pawl (9) carries. 2) three-point hook coupling according to claim 1, characterized in that that the adjusting device (11) for the lateral distance of the lower links (5) away from the hook ends in the area of the Hydraulic block (2) is arranged. 3) three-point hook coupling according to claims 1 and 2, characterized in that that the locking pawls (9) of all tow hooks (8) via a linkage, chain hoists (12, 12) or the like. can be operated from the tractor. -8 - * / 909822/0369 BATH ORIGINAL 4) three-point hook coupling according to claims 1 to 3 »characterized in that that in the actuating linkage or in the chain hoists (12, 13) of the locking pawls spring (14) is provided are. 5) three-point hook coupling according to claims 1 to 4, characterized in that that the adjustment device (11) for the ■ side clearance the lower link (3) part of the operating linkage or the like. the locking pawls of the tow hook forms. BATH ORIGINAL 909822/0369