Motor vehicles – Special wheel base – With means for changing number of supporting wheels – or for...
Patent
1988-12-27
1990-07-10
Marmor, Charles A.
Motor vehicles
Special wheel base
With means for changing number of supporting wheels, or for...
180308, 280 4314, 280 4323, 280 4324, 2807641, B62D 6112
Patent
active
049401106
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION(S)
This U.S. application stems from PCT International application No. PCT/SE87/00295 filed June 24, 1987.
BACKGROUND OF THE INVENTION
The present invention relates to a mobile work unit with raisable and lowerable support legs, for example wheel supported mobile excavators, which, when working, are arranged with lower support legs.
It is desirable to locate the wheel axles of the work unit in such positions in relation to the vehicle body that maximum stability is achieved during transport movement, and with regard to the portion where a movable work device is attached, e.g. an excavator jib with associated bucket, it is of particular importance that an adjacently located pair of wheels are arranged in such a position that the risk for a forward tilting movement is eliminated. However, for such units, having pivotally attached support legs, which by means of a pivoting movement can be moved into a supporting contact position against a ground plane, it has previously not been considered possible to locate the wheel in a forward position in relation to the points of attachment for the support legs against the unit. Such a location is obviously most desirable, since the stability of the work unit thereby can be considerably improved. However, this requires that the vertical position of the wheels can be changed when the support legs are raised/lowered.
SUMMARY OF THE INVENTION
The object of the present invention is to disclose a work unit having the wheels located in a forward and/or rear position in relation to the vehicle body, and also how the support legs can be raised/lowered in relation to the ground plane with a simultaneous movement of adjacent wheels in the opposed direction, said operation being performed as an automatic operation when the support legs are raised/lowered. The present invention also facilitates a simple driving and steering arrangement for the work unit for travel between different work locations, as well as other advantages, which are disclosed in the following descriptive part of the specification.
The mobile work unit according to the present invention is arranged with raisable and lowerable support legs, which adjacent to one end portion are arranged pivotally attached to the work unit, and which during a pivoting movement take up contact with the opposed end portion against a below located ground plane under influence from an associated piston cylinder, and it is mainly characterised in that at least one support leg is arranged supporting a link-shaped member, pivotally attached to the support leg and extending in a transverse direction extending relation to the longitudinal direction of the support leg, and that associated piston cylinder for operating the support leg is pivotally attached with a first end portion against the work unit, the other end portion being pivotally attached adjacent to a first end portion of the link-shaped member, the opposed end portion of said link-shaped member being attached to a movement transferring means, which when the link-shaped member is pivoted between first and second alternative restricting positions causes a movement in substantially opposed direction in relation to the support leg for a vehicle wheel located adjacent to the support leg, the wheel center preferably being located in front of the forward portion or behind the rear portion of the work unit. As a further characteristic feature can be stated, that the movement transferring means comprises of a longitudinally extending member, rigidly connected to the link-shaped member, at the opposed end portion arranged to support a drive motor and/or a vehicle wheel.
BRIEF DESCRIPTION OF THE DRAWINGS
A number of embodiments of a work unit according to the present invention are more fully described below with reference to the example of an embodiment of a work unit shown in the enclosed drawings, in which:
FIG. 1 is a schematical plan view of an excavator having four wheels viewed from above, and with the wheel pair arranged by the support l
REFERENCES:
patent: 3685853 (1972-08-01), Goldsmith
patent: 4008902 (1977-02-01), Dill
patent: 4569422 (1986-02-01), Hoffman
patent: 4655269 (1987-04-01), Hanser et al.
Dahlgren Bo
Svensson Ulf
Johnson Brian
Marmor Charles A.
Svensson Ulf
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