Material or article handling – Self-loading or unloading vehicles – Loading or unloading by other carrier or mover means – and...
Patent
1992-11-13
1994-11-22
Hill, Mitchell J.
Material or article handling
Self-loading or unloading vehicles
Loading or unloading by other carrier or mover means, and...
280400, 280402, 280404, 414555, B62D 5300
Patent
active
053663373
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION AND PRIOR ART
This invention relates to a device for vehicles. The vehicle is in particular a load vehicle, which is especially adapted for cross-country driving. The vehicle may for example be a forest vehicle for transport of wood products or for carrying tree or tree trunk processors.
On such vehicles it is conventionally that the wheels, tracks or the like, generically contact elements, carrying the rear chassis member having the load carrier arrangement are arranged as bogies, i.e. with at least two wheels on each side of the vehicle suspended in a carrier pivotal on the vehicle, the pivot axis of which is located in the region between the axis of rotation of the two wheels. Accordingly, the wheels may not be steered, which gives rise to a considerable amount of friction between the wheels and the ground when the vehicle turns in a curve, since the wheels compulsorily have to be laterally dragged with respect to the ground so as to be able to follow the curve. This frictional resistance on taking curves will of course be as small as possible if the wheels are arranged so close together as possible on each side of the vehicle. However, this gives rise to a deteriorated capability to drive in cross-country, since the risk of that two bogie wheels on one side of the vehicle may simultaneously be received in a hole in the ground will increase, which may cause the vehicle to get stuck.
SUMMARY OF THE INVENTION
The object of the present invention is to start from the known art and show constructional solutions adapted to give the vehicle flexibility on taking curves and in other respects good driving manners.
This object is in accordance with the invention obtained by providing the device with the characteristics defined in the characterising parts of the appended claims.
Thanks to the pivotal interconnection of the two chassis portions forming the rear chassis member, these will be able to pivot with respect to each other at least slightly on taking curves, which considerably improves the flexibility of the vehicle and in particular results in that the wheel units located on the rear chassis member may be arranged at a considerably greater mutual distance than usual in so called bogie arrangements. The increased mutual distance between the wheels on each side of the vehicle increases its carrying capacity without deteriorating the curve flexibility.
It is preferred that the wheels of the vehicle are individually suspended by means of pivot arms vertically pivotal. Because of that it will be possible to have fairly great distance between the wheel units of the chassis portions on each side of the vehicle. Although wheels are the usual contact element of the invention, other contact elements may also be used, e.g. tracks.
The load carrier arrangement is advantageously arranged on the front and rear chassis portions of the rear chassis member in the way defined in one or several of the claims 6-11 and 15-27, whereby the load carrier arrangement may be efficiently carried by the chassis portions at the same time as they may pivot with respect to each other. It is preferred that power means are arranged for determining the pivot angle between the front and rear chassis portions of the rear chassis member.
A particularly uniform and smooth running on movement of the vehicle over an irregular ground is obtained when the device according to the invention is designed as defined more in detail in the appended claims 13 and 14.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the appended drawings, below follows a specific description of embodiments according to the invention cited as examples.
In the drawings:
FIG. 1 is a side elevation of a six wheel vehicle constructed according to the invention,
FIG. 2 is a view from above of the vehicle, but the crane is not shown,
FIG. 3 is a schematic view similar to FIG. 2 but illustrating the vehicle when it turns,
FIG. 4 is a schematic and partially sectional view of the vehicle as seen from behind, i.e. from the right in FIG. 1,
FIG. 5 is a
REFERENCES:
patent: 3603464 (1971-09-01), Teodorescu
patent: 4200315 (1980-04-01), Carlsson
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