Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
  • A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
  • A01B59/06—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors
  • A01B59/066—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors of the type comprising at least two lower arms and one upper arm generally arranged in a triangle, e.g. three-point hitches
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
  • A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
  • A01B59/04—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor
  • A01B59/041—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor preventing or limiting side-play of implements
  • A01B59/0415—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor preventing or limiting side-play of implements by hydraulic or pneumatic means acting on the lower draft links

Definitions

• the present invention relates to an actuator intended to aid hitching of an implement to a three-point linkage of a tractor or similar pulling vehicle.
• hitching of the implement can be carried out without the need for the driver to leave the cabin for hitching, since the function of the hydraulic cylinder can be controlled by the control levers of the tractor's hydraulic systems which are located in the tractor cabin.
• Figure 1 is a perspective view of an actuator device according to the invention mounted to a tractor;
• Figure 2 is a top view of the actuator device illustrated in Fig. 1 with an implement hitched to the pulling links.
• the hydraulic cylinder 5 is mounted between the two parallel pulling links 3 of the tractor 2 so that its cylinder portion 5a is connected to one pulling link 3, while its piston rod 5b is connected to the opposite pulling link 3.
• the hydraulic cylinder 5 is adapted to be powered by the conventional hydraulic system of the tractor via two hydraulic oil hoses 6 connected to a two-way directional control valve bank 4 of said hydraulic system, said hoses 6 advantageously being attached to said control valve bank 4 by means of quick-release connectors 6a.
• the operation of the hydraulic cylinder 5 can then be controlled by control levers located in the tractor cabin 7 of the tractor as a standard accessory of the tractor.
• the hydraulic cylinder 5 is advantageously manufactured with an approx. 0.10 - 0.20 mm clearance between the cylinder inner wall and the piston without using any seal to bridge the clearance.
• the piston can be advantageously manufactured from a bearing alloy. This arrangement ensures that the piston inherently provides a bypass channel for a certain amount of hydraulic oil thus preventing excessive load on the pulling links 3 notwithstanding the direct connection of the hydraulic cylinder to the tractor's hydraulic system without using any pressure reducing means. Such an arrangement also permits floating movement of the pulling links 3 during the time the hydraulic cylinder 5 is not powered.
• the mounting of the hydraulic cylinder can be modified so as to cause minimal disturbance to the use of the power take-off shaft of the tractor.
• the hydraulic cylinder 5 can be made easily detachable and transferrable to another tractor 2 having compatible cylinder end joints.
• the function of the actuator device is as follows. To hitch an implement 1 to the three-point linkage of a tractor 2, the tractor 2 is initially reversed in front of the implement 1 and the pulling hole 8 of one pulling link 3 of the tractor linkage is aligned with the compatible pulling pin 9 of the implement. Next, the hydraulic cylinder 5 is activated by operating the control lever of the control valve bank 4 so that the hydraulic cylinder 5 is powered to actuate the pulling links 3 with a pulling force. Then, the pulling link 3 is moved toward the pulling pin 9 of the implement 1 so as to locate the pin through the pulling hole 8 of the pulling link 3.
• the pulling links 3 of the tractor are lifted at a moderate force by operating another control lever of the tractor hydraulic system until the friction of the pin in the hole is sufficient to keep the pulling pin 9 of the implement in place in the pulling hole 8 during the subsequent hitching step of the implement.
• the hydraulic cylinder 5 is controlled to actuate in the opposite direction so that the pulling links 3 are forced to away from each other.
• the pulling hole 8 of the opposite side pulling link 3 is aligned in front of the mating pulling pin 9 of the implement, after which the hydraulic cylinder 5 is powered to actuate a pulling force between the links.
• the opposite side link 3 is moved toward the pulling pin 9 of the implement so as to locate the pin through the pulling hole 8 of the pulling link 3.
• both sides of the tractor 2 can be provided with conventional lateral movement limiters 10 adapted between the tractor chassis and said pulling link 3.
• the unhitching of the implement 1 from the pulling links 3 of the tractor is made extremely simple. After the securing pins are removed from the ends of the pulling pins 9, the pulling pins 9 can be released from the pulling links 3 by controlling the hydraulic cylinder 5 to push the pulling links apart from each other.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Zoology (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Soil Sciences (AREA)
• Environmental Sciences (AREA)
• Lifting Devices For Agricultural Implements (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=8539305

Family Applications (1)

Country Status (5)

Families Citing this family (3)

Family Cites Families (4)

• 1994
  • 1994-01-28 FI FI940055U patent/FI1258U1/fi active
• 1995
  • 1995-01-25 CA CA002181434A patent/CA2181434A1/en not_active Abandoned
  • 1995-01-25 WO PCT/FI1995/000035 patent/WO1995020311A1/en not_active Ceased
  • 1995-01-25 EP EP95905676A patent/EP0740500A1/de not_active Withdrawn
• 1996
  • 1996-07-12 NO NO962941A patent/NO962941D0/no unknown

Non-Patent Citations (1)

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