Agricultural machine
AssigneeC. van der Lely N.V.
InventorsEdwin van der Lely, Cornelis J. G. Bom
Life of this patent
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Abstract
A haymaking machine comprises a sub-assembly provided with two rake members, the sub-assembly being connected to a frame for pivotal movement about a pivotal axis that slopes upwardly to the rear. The center of gravity of the sub-assembly is ahead of such axis and a locking mechanism is provided for retaining the sub-assembly in a required working or transport position with respect to the frame. The disposition of the center of gravity and the pivotal axis is such that, when the locking mechanism is released, lifting machine above the ground causes the sub-assembly to swing automatically about the pivotal axis towards a transport position. If the machine is lifted more, the sub-assembly then swings automatically towards the working position.
Claims37
An agricultural machine comprising:
- a frame including means adapted for connection to a three-point lifting device of a tractor which are so constructed and arranged that said frame can be raised by said three-point lifting device;
- a sub-assembly comprising a working member of the machine;
- and
- connecting means connecting said sub-assembly to said frame for pivotal displacement between a working position and a transport position about an upwardly extending pivotal axis which, in the working position is inclined to the rear with respect to the intended direction of operative travel of the machine, from bottom of top;
- the center of gravity of said sub-assembly, when in said working position, being spaced from said pivotal axis so that when the machine is lifted by a tractor's three-point lifting device it is displaceable by gravity from said working position to said transport position when the tractor and machine are supported by a substantially level surface.
An agricultural machine comprising:
- a frame adapted for connection to a three-point lifting device of a tractor;
- a sub-assembly comprising a working member of the machine;
- and connecting means connecting said sub-assembly to said frame for pivotal displacement between a working position and a transport position about an upwardly extending pivotal axis which, in the working position, is inclined from bottom to top to the rear with respect to the intended direction of operative travel of the machine;
- said sub-assembly's center of gravity when in said working position being spaced from said pivotal axis, said center of gravity further being in a plane at right angles to said pivotal axis and on a circle in said plane centered on said pivotal axis at a location which is spaced away from the lowest point on said circle.
An agricultural machine comprising:
- a frame adapted for connection to a three-point lifting device of a tractor;
- a sub-assembly comprising a working member;
- and connecting means connecting said sub-assembly to said frame for pivotal displacement between a working position and a transport position about an upwardly extending pivotal axis which, in the working position, is inclined from bottom to top to the rear, with respect to the intended direction of operative travel of the machine;
- the center of gravity of said sub-assembly, when in said working position, being spaced from and ahead of said pivotal axis with respect to the machine's intended direction of operative travel.
An agricultural implement which comprises:
- a frame including means for connection to a tractor's three-point lifting device;
- a sub-assembly comprising a working member;
- and pivot means pivotably supporting said sub-assembly from said frame so it can be selectively turned about the pivot axis of said pivot means, said pivot axis being inclined upwardly in a direction away from said connection means when said sub-assembly is in a working position;
- said sub-assembly having a center of gravity spaced laterally, considered from said connection means, from said pivot axis so that when the implement is raised to a first level above a horizontal surface supporting the tractor by the tractor's three-point lifting device, said pivot axis is still inclined upwardly in a direction away from said connection means and said sub-assembly is urged by gravity to pivot from a first position to a second level about said pivot axis, and when said implement is raised to a second level so that said pivot axis is inclined upwardly in a direction towards said connection means, said sub-assembly is urged by gravity to pivot from said second position to said first position.
Dependencies are inferred from the claim text.