Abstract: A coupling device is disclosed which is designed as a hook with a hook body, an opening that allows the mating part of the attachment to enter the hook body, a guideway and a shoulder to counter any offset between the mating part of the attachment to the hook. Furthermore, the coupling device includes a locking latch that protrudes into the opening of the hook body and locks the mating part of the attachment in order to engage the mating part with the hook body, thereby retaining the mating part in a locked position. In an embodiment, the locking latch has a geometry that limits the motion of the locking latch and generates a motion curve. Furthermore, the locking latch moves on a motion curve to allow the locking latch to release the opening in order to allow the mating pan to enter the socket.

Abstract: A ball coupling includes socket member and a ball member. The ball member can be placed and retained in, and also removed from, the socket member in an expedient manner. The socket member can be formed by machining, may be connected to a rod or other movable element, and does not require a recess to be forged or cast. The ball member is also simple to construct and may be attached to another rod or movable element, such that a relatively large angular travel is permitted between the socket member and the ball member.

Abstract: A protection arrangement for a double universal joint (1) for drives of agricultural implements has a first protection element (11), an annular second protection element (15) and a third protection element (18). The first protection element (11) has first holding projections (14) circumferentially distributed on its outer circumference (13) close to the first front edge. The first holding projections (14) project beyond the outer circumference (13) and form at least over a circumferential edge portion, distanced to the first front edge, a groove. A support tab projects beyond the first front edge. The second protection element (15) has second holding projections (17) circumferentially distributed on its outer circumference close to the second front edge. The second holding projections (17) project beyond the outer circumference and form, at least over a first circumferential edge area close to the second front edge, a second groove.

Abstract: A protection arrangement for a joint (1), especially a double universal joint driving or in drives of agricultural devices and self-propelled implements, has a tube-like first protection element (12) with a first axial end (13) and a second axial end. At least the first axial end (13) is open. An attachment portion (16) is on the first axial end (13). The first protection element (12) is supported on a first component (4) of the joint (1). A second plastic protection element (17) is formed as a hollow body. The second protection element is open at both ends with an axially open first end portion (18) and an axially open second end portion (19). An envelope portion (20, 120, 220) is formed between the first and second open end portions (18,19). The envelope portion (20, 120, 220) has a lattice structure. The first end portion (18) is connectable to the attachment portion (16) of the first protection element (12).

Abstract: A protection arrangement for a double universal joint (1) for drives of agricultural implements has a first protection element (11), an annular second protection element (15) and a third protection element (18). The first protection element (11) has first holding projections (14) circumferentially distributed on its outer circumference (13) close to the first front edge. The first holding projections (14) project beyond the outer circumference (13) and form at least over a circumferential edge portion, distanced to the first front edge, a groove. A support tab projects beyond the first front edge. The second protection element (15) has second holding projections (17) circumferentially distributed on its outer circumference close to the second front edge. The second holding projections (17) project beyond the outer circumference and form, at least over a first circumferential edge area close to the second front edge, a second groove.

Abstract: A hydraulic lift device for an attaching device of a tractor which has a hydraulic pressure supply device and a hydraulic tank, comprising for each of two lower steering arms, a double acting hydraulic cylinder having a cylinder housing, a piston rod, a piston with a piston-end piston area and a piston rod-end piston area, as well as a piston-end cylinder chamber and a piston rod-end cylinder chamber. The device further comprises a first switching valve, which has at least three switching positions and four ports. The first port represents a connection to the pressure supply device. The second port represents the connection to the hydraulic tank. The third port represents the connection to the piston-end cylinder chamber of the first hydraulic cylinder and the fourth port represents the connection to the piston rod-end cylinder chamber of the second hydraulic chamber.

Abstract: A protection arrangement for a joint (1), especially a double universal joint driving or in drives of agricultural devices and self-propelled implements, has a tube-like first protection element (12) with a first axial end (13) and a second axial end. At least the first axial end (13) is open. An attachment portion (16) is on the first axial end (13). The first protection element (12) is supported on a first component (4) of the joint (1). A second plastic protection element (17) is formed as a hollow body. The second protection element is open at both ends with an axially open first end portion (18) and an axially open second end portion (19). An envelope portion (20, 120, 220) is formed between the first and second open end portions (18,19). The envelope portion (20, 120, 220) has a lattice structure. The first end portion (18) is connectable to the attachment portion (16) of the first protection element (12).

Abstract: The invention relates to a hydraulic lift device for an attaching device of a tractor which has a hydraulic pressure supply device and a hydraulic tank, comprising for each of two lower steering arms, a double acting hydraulic cylinder having a cylinder housing, a piston rod, a piston with a piston-end piston area and a piston rod-end piston area, as well as a piston-end cylinder chamber and a piston rod-end cylinder chamber. The device further comprises a first switching valve, which has at least three switching positions and four ports. The first port represents a connection to the pressure supply device. The second port represents the connection to the hydraulic tank. The third port represents the connection to the piston-end cylinder chamber of the first hydraulic cylinder and the fourth port represents the connection to the piston rod-end cylinder chamber of the second hydraulic chamber.

Abstract: A device for setting the length of a top rink (7) of an attaching device of a tractor (1) has a piston/cylinder unit (14) for length setting purposes. The piston/cylinder (14) has a displacement sensor (20) which records the respective actual length setting of the top link (7). The displacement sensor (20) generates an actual proportional length signal. A lift position sensor (13) is provided which generates an electric signal representing the respective actual lift position of the lower steering arms (4). A nominal length setting of the top link (7), which refers to the respective actual lift position, can be stored in a storage unit (33). When a new actual lift position is reached during the automatic mode of operation, it is possible to generate an electric control signal which corresponds to the nominal length setting of the top link (7). The signal is transmitted to the comparator of a control unit (34). The comparator compares the control signal with the actual length signal.

Abstract: A side strut (5) for a lower steering arm of a tractor has a single-action hydraulic cylinder with a cylinder housing (9) and a piston (16). The piston includes a hollow cylinder (17) with a base (18). In the hollow cylinder (17), a rod-shaped element (20) is adjustable against the force of a spring from a moved-in position into a moved-out position. Because the piston (16) and the setting element (20) move in the same direction, it is possible to achieve a telescopic design which leads to a short installation length which, in turn, results in a more advantageous buckling strength.

Abstract: The invention relates to a device for stabilizing the two lower steering arms (1) of a tractor. The lower steering arms (1) can be actuated by a hydraulic power lift (9). Each lower steering arm (1) is associated with a side strut (6) which includes a single-acting hydraulic cylinder (7) to stabilize and secure the lower steering arm (1). A pre-selection valve (12) and a control valve (13) enable the hydraulic cylinders to be connected to the power lift (9) either via a line or loaded separately by a second pressure source (P2). Thus, independently of the actuation of the power lift (9), the two lower steering arms can be centrally centered by the hydraulic cylinders (7).

Abstract: A device for setting the length of a top link (7) of an attaching device of a tractor (1) has a piston/cylinder unit (14) for length setting purposes. The piston/cylinder (14) has a displacement sensor (20) which records the respective actual length setting of the top link (7). The displacement sensor (20) generates an actual proportional length signal. A lift position sensor (13) is provided which generates an electric signal representing the respective actual lift position of the lower steering arms (4). A nominal length setting of the top link (7), which refers to the respective actual lift position, can be stored in a storage unit (33). When a new actual lift position is reached during the automatic mode of operation, it is possible to generate an electric control signal which corresponds to the nominal length setting of the top link (7). The signal is transmitted to the comparator of a control unit (34). The comparator compares the control signal with the actual length signal.

Abstract: A lifting device for lower steering arms of a tractor has a position recording device (25). The position recording device (25) generates a position signal representing the pivot position of the lower steering arms (2, 3). A piston-cylinder unit (11, 12) acts on the tractor and on the lower steering arm (2, 3). A switching circuit is provided per piston-cylinder unit (11, 12). The switching circuit includes a directional valve (33, 33′) with four ports and four switching positions. In a first position of the directional valve (33, 33′) all ports are blocked. In a second position, the cylinder chamber at the piston end is connected to the pressure agent supply source and the cylinder chamber at the piston rod end is connected to the return line. In a third position, the cylinder chamber at the piston rod end is connected to the pressure agent supply source and the cylinder chamber at the piston end is connected to the return line.

Abstract: A device for setting the length of a top link (7) of an attaching device of a tractor (1) has a piston/cylinder unit (14) for length setting purposes. The piston/cylinder (14) has a displacement sensor (20) which records the respective actual length setting of the top link (7). The displacement sensor (20) generates an actual proportional length signal. A lift position sensor (13) is provided which generates an electric signal representing the respective actual lift position of the lower steering arms (4). A nominal length setting of the top link (7), which refers to the respective actual lift position, can be stored in a storage unit (33). When a new actual lift position is reached during the automatic mode of operation, it is possible to generate an electric control signal which corresponds to the nominal length setting of the top link (7). The signal is transmitted to the comparator of a control unit (34). The comparator compares the control signal with the actual length signal.

Abstract: A side strut (5) for a lower steering arm (1) of a tractor has a single action hydraulic cylinder (9) whose piston (12) includes first attaching means (6) to be connected to the rear of the tractor. The strut (5) also has a telescopic unit (10) and a setting unit (11). The hydraulic cylinder (9), the telescopic unit (10) and the setting unit (11) are arranged, one behind the other on a longitudinal axis (20). The setting unit serves to achieve a categorical setting and the telescopic unit (10) serves to offset the change in the length of the side strut (5) when the lower steering arm is deflected sideways.

Abstract: A lifting rod for the lower steering arm of a tractor, at the ends of the lifting rod, has connecting elements in the form of a connecting yoke 6 and a ball joint 7. The connecting yoke 6, via a threaded rod 9, is threaded into a threaded bore 10 of a tubular rod element 11. The rod element 11 is received in the housing bore 21 of the housing 8 and is movable along the longitudinal axis 17. The rod element 11 and the housing 8 are able to assume two different positions relative to one another, with the lifting rod length being fixed in one of the two positions. In the other position, both may assume a floating relationship relative to one another.

Abstract: A coupling and centering device is attached to a journal (38) of a carrying frame (37) of an agricultural implement. The coupling and centering device has a catching ball (7) and a catching profile (14). The catching profile (14) has a sleeve (15) and a catching plate (25) which are connected to one another. The sleeve (15), in the fitted condition, enters a bore step (12) of the catching ball. The catching plate (25) is arranged relative to the sleeve (15) such that the transverse bore (19), for receiving the lynch pin, is arranged in the region of the wall of the catching plate (25). Thus, in view of a predetermined length of the journal (38) and the provision of the fixing bore (39), the greatest possible guiding length of the sleeve (15) is achieved on the journal (38). In this way, the strength of the connection is affected positively.

Abstract: A coupling hook 5 for a lower steering arm 3 of a three-point attaching device of a tractor has a hook member 6 with a locking catch 7 which is spring-loaded in the direction of the locking position. The locking catch 7 is arranged in a recess 12 of the hook member 6 and extends through an aperture 13 into the bearing recess 10 to receive a bearing ball 11. For the purpose of supporting and guiding the locking catch 7, the hook member 6 is provided with a first stop face 14 and a second supporting stop 15, arranged at a distance therefrom and offset towards the rear. In the locking position, the locking catch 7 is supported on the hook member 6 by means of a first supporting face 19, a second supporting face 21 and a blocking face 22.

Abstract: A coupling device for a tractor has a frame (4) which is mounted on the rear underside (3) of the tractor (1). A drawbar (14), with a coupling member (15), is guided in the frame (4). The drawbar (14) is moved by a slide (18) and can be swung sideways about a vertical axis. Centering pieces (34) and stop blocks with centering faces (35) and stop faces (38) engage one another to laterally align and fix the drawbar (14). In a lower position the drawbar facilitates lateral swivelling movement about the connecting pin (22). In an upper towing position the drawbar (14) is laterally fixed by the centering pieces (34) and the stop blocks (38). This results in improved control of the coupling members associated with the to be towed implement through lateral alignment of the drawbar and its automatic transfer into its centered position.

Abstract: The invention relates to an three-point coupling device (3) for connecting a tractor to an implement (4). Two lower hitch arms (5, 5a) have been provided with catching hooks (7, 7a). An upper hitch arm (8) has also been provided with a catching hook (11). The lower hitch arms (5, 5a) may be raised or lowered by a power drive via lifting bars (10, 10a) and lifting arms (9, 9a). The upper hitch arm (8) is suspended from a holding device (20, 20a) which is associated with the lifting bars (10, 10a). As a result, the upper hitch arm (8) may be moved jointly with the lower hitch arms (5, 5a) upon actuation of the power drive which moves the lifting arms (9, 9a) and the lifting bar (10, 10a). It is no longer necessary for the tractor driver to hold the upper hitch arm (8) himself and place it on the upper coupling point (14) of the implement (4).