Land vehicles – Wheeled – Attachment
Reexamination Certificate
2000-04-28
2001-08-21
Mar, Michael (Department: 3619)
Land vehicles
Wheeled
Attachment
C212S302000, C280S766100
Reexamination Certificate
active
06276718
ABSTRACT:
BACKGROUND 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.
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 situations 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 support strut includes at least two strut parts which can pivot around an articulated joint axis, the axis being parallel to the vertical axis of the chassis. The support strut is preferably comprised of an inner strut part continuously and sturdily in communication with the telescope segment and an outer strut part pivotal with respect to the inner strut part about a linkage axis and carrying the foot part. If the support strut is extended out of the telescope segment and if the linkage axis is situated outside of the telescope segment, then the outer strut part can be pivoted about the pivot or linkage axis, so that it can be pivoted up close to the chassis so that the work machine can thereby be supported close-in. For the wide-stance support, the strut parts are locked or arrested with respect to each other in the extended position, preferably in alignment. For particularly broad stance supporting, it is of advantage, when the strut part on the foot part side is comprised of at least two telescopic parts.
In accordance with a first preferred embodiment of the invention, it is envisioned that in the retracted transport position with aligned strut parts the linkage axis is provided within the telescope segment, and in the extended support position it is provided outside of the telescope segment.
With greater support breadths, it can be of advantage, when the linkage axis is provided outside of the chassis-fixed telescope segment both in the retracted transport position as well also in the extended work position. Herein the foot-part carrying strut part can, in the transport position of the support strut, be pivoted about the linkage axis against the longitudinal side of the vehicle chassis and be arrested or locked in this position for transport. A further preferred embodiment of the invention envisions that the chassis-fixed telescope segment is provided on the chassis spaced apart behind the front axle or the driver cabin and, with its support strut outlet end, is directed transversely or diagonally in the direction of the front axle or driver cabin. Preferably herein two telescope segments for receiving respectively one support strut or one strut part are provided facing opposite sides of the vehicle chassis and crossing the vehicle chassis longitudinal axis in different planes or levels, the telescope segments being fixed to the chassis.
A further alternative variation of the invention envisions, that the telescope segment and the support strut are bowed in the manner of an arc. The telescope segment can transversely cross over the vehicle longitudinal axis behind the front axle or the driver cabin and at the outlet side be directed diagonally in the direction of the front axle or driver cabin, or can be oriented tangentially to the vehicle longitudinal axis and at the outlet side be directed diagonally sideways in the extension direction.
In order to ensure a secure stance, it is advantageous when a locking mechanism is provided for locking the support struts in at least one predetermined angular position against rotation about the linkage or pivot axis. Further, in accordance with the invention it is proposed to provided a pivot mechanism between the support strut parts, which may involve a rotary motor or a hydraulic cylinder.
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patent: 4394913 (1983-07-01), Lanning et al.
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patent: 4723667 (1988-02-01), Zimmerman
patent: 5398969 (1995-03-01), Wimmer
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.
patent: 3124029 (1983-03-01), None
patent: 357988 (1983-03-01), None
Höness Stephan
Wolfram Markus
Mar Michael
Pendorf & Cutliff
Putzmeister Aktiengesellschaft
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