Windrower tractor with rear wheel suspension
AssigneeMacDon Industries Ltd.
InventorPhilip J. Otto
Life of this patent
Estimating the term…
Abstract
A tractor has front wheels mounted on the frame at fixed angles and a pair of rear wheels each mounted on a respective castor assembly. Each of the castor assemblies has a vertical pivot axis mounted in a swivel support of an axle of the frame and a bottom transverse tubular member connected to a pair of parallel forks carrying at a lower ends the transverse axle of the wheel. The mounting link includes a torsion spring defined by a rod attached to the forks which passes though a sleeve containing a resilient elastomeric spring of the tubular member allowing spring suspension pivotal movement of the upper ends of the forks relative to the bottom transverse member about an axis parallel to the wheel axis.
Claims18
An agricultural tractor comprising:
- a tractor frame arranged for attachment to an implement to be moved in a longitudinal working direction across the ground;
- a first pair of ground wheels mounted on the frame at positions spaced transversely of the frame on either side of a center line of the frame;
- a transverse beam mounted on the frame at a position spaced longitudinally from the first pair of ground wheels;
- a second pair of ground wheels mounted on the beam at respective ends thereof;
- the beam being mounted on the frame for pivotal movement about a substantially horizontal axis along the center line of the tractor;
- each of the second ground wheels being mounted on the beam by a respective castor assembly;
- each of the castor assemblies comprising:
- a transverse axle of the wheel,
- a pivot member having a vertical rod defining a vertical pivot axis mounted in a swivel support of the beam and a bottom transverse member connected to a bottom of the vertical pivot rod,
- a mounting link interconnecting the bottom transverse member and the axle such that the axle is located below the pivot member and, in respect of a forward direction of movement, in a plane radial to the vertical pivot axis and rearwardly of the vertical pivot axis,
- the mounting link including a torsion spring allowing spring suspension pivotal movement of the upper ends mounting link relative to the bottom transverse member about an axis parallel to the wheel axis.
An agricultural tractor comprising:
- a tractor frame arranged for attachment to an implement to be moved in a longitudinal working direction across the ground;
- a first pair of ground wheels mounted on the frame at positions spaced transversely of the frame on either side of a center line of the frame;
- a transverse beam mounted on the frame at a position spaced longitudinally from the first pair of ground wheels;
- a second pair of ground wheels mounted on the beam at respective ends thereof;
- each of the second ground wheels being mounted on the beam by a respective castor assembly;
- each of the castor assemblies comprising:
- a transverse axle of the wheel,
- a pivot member having a vertical rod defining a vertical pivot axis mounted in a swivel support of the beam and a bottom transverse member connected to a bottom of the vertical pivot rod,
- a mounting link interconnecting the bottom transverse member and the axle such that the axle is located below the pivot member and, in respect of a forward direction of movement, in a plane radial to the vertical pivot axis and rearwardly of the vertical pivot axis,
- the mounting link including a torsion spring allowing spring suspension pivotal movement of the upper ends mounting link relative to the bottom transverse member about an axis parallel to the wheel axis;
- wherein the bottom transverse member comprises a tubular member with the vertical pivot rod passing through the tubular member.
Dependencies are inferred from the claim text.