Land vehicles – Wheeled – Attachment
Reexamination Certificate
2000-04-28
2001-10-30
Johnson, Brian L. (Department: 3618)
Land vehicles
Wheeled
Attachment
C280S763100, C212S302000
Reexamination Certificate
active
06308985
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a mobile working machine including a chassis with at least front and rear axles carrying the working machine, a preferably horizontally oriented telescope segment provided on the chassis, and a support strut moveable between a retracted transport position and at least one extended work position, and supportable on the ground via at least one preferably extendable foot part provided at the free end of the support strut.
2. Description of the Related Art
A working machine of the above-described type, designed as a mobile cement pump, is known (EP-B 0 357 988) in which two diagonally forward directed support struts are provided designed as telescoping legs, with their tubular shaped telescope segments provided on a chassis rigidly connected to a mast block, with struts slideable between a retracted transport position and an extended support position in the telescope segments which cross over each other. The diagonal telescoping struts do make it possible to set up the cement pump even in a construction area in which vehicles with front pivoting struts or telescopic pivot struts would not find room. However, the traffic conditions on the streets, and the space problem in construction areas, often do not permit a supporting stance of the support struts in full breadth perpendicular to the vehicle. It is thus frequently necessary to restrict the support breadth.
SUMMARY OF THE INVENTION
Beginning herewith, the present invention is concerned with the task of improving the known work machine in such a manner that with simple means a modification of the support breadth via the support struts is made possible.
The inventive solution is based on the concept, that in many cases which occur in the real world, in which work is accomplished on only one side of the work machine, it is desirable when the front support strut, on the side opposite to the side where work is occurring, provides support as close-in and as far in front of the driver's cabin of the vehicle chassis as possible, with the object of maximizing the forward tip-axis. In order to achieve this, it is proposed in accordance with the invention that the telescopic segment is comprised of a chassis-fixed inner segment part and an outer segment part which, with respect to the inner segment part, is limitedly pivotable about a pivot axis which is parallel to the vehicle vertical axis. When the support strut is in its retracted transport position, then the transport segment is engaged over its entire length, so that the outer segment part cannot be rotated. When, on the other hand, the support strut is in its extended supporting position, then the support strut is held only by the outer, rotatable segment part. In this situation, the segment part together with the support strut can be pivoted up to the vehicle chassis.
An advantageous embodiment of the invention envisions that the outer segment part together with the pivot axis is provided on a carrier limitedly displaceable relative to the vehicle chassis perpendicular to the vehicle longitudinal axis. The carrier is preferably comprised of a guided part guided in a displacement guide perpendicular to the vehicle longitudinal axis and a pivot part carrying the outer segment part and pivotable about the pivot axis with respect to the guide part. Thereby it is achieved, that the pivot axis can be extended to laterally projecting beyond the vehicle chassis, so that the support strut can be pivoted up to the edge of the vehicle chassis without obstacle.
An advantageous design of the invention envisions that the vehicle-fixed segment part is provided at an interval behind the front axle or driver cabin of the vehicle chassis and, on the extension or projection side, is directed diagonally in the direction of the forward axle or driver cabin. For facilitating the construction and for improvement of the pivot kinematics it has been found advantageous that the pivot axis be displaced laterally, with respect to the outer segment part, in the direction of the front axle.
An enlargement of the extension breadth or stance can be achieved when the support strut is comprised of at least two telescopic parts, of which the outer part carries the foot part.
A further preferred embodiment of the invention envisions that two telescope segments for receiving respectively one support strut, directed towards opposing sides of the vehicle chassis, are provided with their inner segment parts crossing over the vehicle chassis longitudinal axis in different planes or levels.
According to a further advantageous embodiment, the segment parts of the telescopic segment and the support struts are curved arc-like. Thereby the telescope segment can cross perpendicularly over the vehicle chassis longitudinal axis behind the front axle or a driver cabin and, on the extension side, be directed diagonally outwards in the direction of the front axle or driver cabin. An alternative embodiment envisions that the arc-shaped curved telescope segment is directed tangential to the vehicle longitudinal axis and is aimed in the extension direction diagonally laterally outwardly.
In order to provide a stable supporting, it is advantageous when a locking mechanism such as a bolt
49
is provided for locking the outer segment part in at least one predetermined angular position against rotation about its pivot axis.
REFERENCES:
patent: 3362544 (1968-01-01), Wellnitz
patent: 3495727 (1970-02-01), Long
patent: 3985036 (1976-10-01), Decker et al.
patent: 3987563 (1976-10-01), Baur
patent: 5638967 (1997-06-01), Heckmann
patent: 5706960 (1998-01-01), Pitman et al.
patent: 5961145 (1999-10-01), Schillinger et al.
patent: 6092975 (2000-07-01), Cannon, Jr. et al.
Johnson Brian L.
Pendorf & Cutliff
Putzmeister Aktiengesellschaft
Winner Tony
LandOfFree
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