Traversing hoists – Adjustable to transport or nonuse position – Vehicle stablizing means
Patent
1999-04-22
2000-10-31
Brahan, Thomas J.
Traversing hoists
Adjustable to transport or nonuse position
Vehicle stablizing means
212303, B66C 2378
Patent
active
061388459
DESCRIPTION:
BRIEF SUMMARY
The invention (innovation) relates to automotive vehicle cranes of the type stated in the preamble of claim 1 and further contains in particular a new framework and outrigger construction with a particular suitability for vehicle cranes.
Automotive vehicle cranes have to meet a plurality of requirements in order to be homologated to the traffic on public highways. In Germany, in this respect the regulations of the Road Traffic Type Approval Law (StVZO) are decisive.
Part of these requirements are a minimum cruising speed on public roads of 62 km/h and a visual range diameter for the driver with a radius R of .ltoreq.12 m. In order to be authorized to drive without being accompanied by the traffic police, the maximum breadth of the crane vehicle should not exceed <3 m. Due to the limited overhead clearance of road bridges, the total height of the vehicle crane in the driving state should be .ltoreq.4.0 m. With respect to the unloaded weight, there are also specified restrictions due to the limited load carrying ability of bridges.
Vehicle cranes have a chassis with a stable framework extending in the center of the vehicle in the longitudinal direction of the vehicle. Under this framework, in most of the conventional constructions the axles of at least two wheel pairs extend, some of which can be driven and steered. The wheels are attached to the framework by means of appropriate suspensions.
The outriggers on which the vehicle crane rests during the crane operation and which are indispensable for the crane operation are also connected with the framework. In the conventional 4-point-support, four extendable or swivelling outrigger beams are provided, at the free ends of which each a hydraulic outrigger cylinder and a stabilizer plate are provided. The conventional outrigger beams are extended or swivelled in the direction transverse to the longitudinal axis of the framework to such an extent that the vehicle crane has a sufficient overturn stability when lifting loads. Conventionally, two outrigger beams extendable in opposite directions are provided in the region of the leading vehicle framework end and two outrigger beams extendable in opposite directions are provided in the region of the trailing vehicle framework end.
Above the framework and supported by the same, a slew ring is provided which carries the complete crane superstructure. The crane superstructure comprises a framework denoted turntable, which carries the crane boom (jib) with its basic member and its telescoping members as well as the lift gear erecting the boom. Naturally, each automotive vehicle crane has appropriate driving and steering facilities for the chassis, driving facilities for the turntable as well as facilities for operating the lift gear and for telescoping in and out the telescoping members as well as for lifting and lowering loads.
FIG. 5 schematically shows a plan view on the framework and outrigger construction of conventional vehicle cranes. A framework 111 extending in the longitudinal axis of the vehicle for a four-axle vehicle crane is represented. At the leading end of the framework, two front outrigger beams 101, 102, which can be hydraulically extended in the direction transverse to the longitudinal axis of the framework and which in their retracted state (not shown) are accommodated in cases 100, are represented in their extended position,. The outrigger beams 101, 102 comprise at their free ends each a hydraulic outrigger cylinder with a stabilizer plate 103, 104. Furthermore, at the trailing end of the framework, two rear outrigger beams 104, 105, which can be hydraulically extended in the direction transverse to the longitudinal axis of the framework, are represented in their extended position as well as the accommodation cases 99 associated to the outrigger beams 104, 105.
In the crane operation, a vehicle crane only rests on the outrigger cylinders, as the wheels of the chassis are lifted off the ground or the road.
In the conventional framework and outrigger construction, the framework 111 is subject to t
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patent: 4496062 (1985-01-01), Gattu et al.
patent: 5213222 (1993-05-01), Becker
Brahan Thomas J.
Compact Truck AG
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