TECHNICAL FIELD

The present invention refers to stabilizers for operative means and refers to a stabilization device for preventing or reducing oscillations and rollover risks of a corresponding parked vehicle during the moving of its protruding operative arm, which is foldable and/or extensible, for instance, fit for pumping concrete up to pouring sites far from the vehicle and inaccessible thereto.

BACKGROUND ART

Mobile pumps are known for concrete equipped with a frame provided with wheel axles, with front and rear legs and with a support for an installed tubular distributing duct, rotating around a vertical axle, near to the front axle and fit for flowing the concrete in an arm provided with output pipes. The two frontal legs are telescopic with their external element rigidly fixed to a carrying frame stiffly connected to the distributing duct. The two rear support legs are extensible and connected by means of a corresponding vertical pivot at the rear end of the telescopic pipes of the respective opposite front legs on the frame. In such way the rear legs can rotate around a vertical axle among their gear position, turned backwards parallel to the frame, and a support position diagonally backwardly and outwardly directed.

A disadvantage of such known stabilization devices for concrete pumps in which the rear legs are hinged to rear end of the front legs is that the respective frame is highly heavy and bulky.

Other disadvantage of such devices consists in that they are excessively rear positioned with respect to the connected vehicle.

DISCLOSURE OF THE INVENTION

The object of the present invention is to propose a stabilization device for a light parked vehicle and therefore allowing to increase the useful load of the vehicle.

Other purpose is to propose a compact device and meanwhile fit for supplying a wide support surface advanced with respect to vehicle.

Further purpose is to propose a simple, economic, reliable and of sure device.

BRIEF DESCRIPTION OF THE DRAWINGS

The characteristics of the invention are underlined in the following with particular reference to the attached drawings, in which:

- figure 1 shows a side view of the stabilization device coupled to a vehicle and in a rest condition, or not operative condition;

- figure 2 shows a top view of the device of figure 1 ;

- figure 3 shows the figure 2 of the device in an operative condition;

- figure 4 shows a top view at a rest condition of a first variant of the figure 1 device;

- figure 5 shows a top view at an operative condition of a second variant of the device of figure 1

- figures 6 and 7 respectively show side view at rest condition and top view at operative condition of a third variation of the device of figure 1 associated to an obstacle;

- figure 8 shows a side view of a fourth variant of the device of figure 1 ;

- figures 9 and 10 show plant views respectively at rest and operating conditions of the device of figure 8;

- figures 11 and 12 show plant views respectively at rest and operative condition of a fifth variant of the device of figure 1 ;

- figures 13 and 14 show plant views respectively at rest and operative conditions of a sixth variant of the device of figure 1.

BEST MODE OF CARRYING OUT THE INVENTION

With reference to figures 1 - 3, 1 indicates the device object of the present invention, for the stabilization of a vehicle 2 in a parking condition thereof.

The vehicle 2 comprises a chassis 3, provided with at least a front axle 4 and at least a rear axle 5, on which it is fixed, by bolts or weldings and possible stiffening backstays of the chassis 3, a frame 8 of the device 1 fit for fixing a rotating support 14 for an operative element, consisting, for instance, in an extensible or pliable arm for supporting an adduction duct for liquids, concrete, concrete for castings or fluids in general.

The frame 8 supports two front arms 6, 16 and two rear arms 7, 17 nearly contained in the plant profile of the vehicle in the rest condition and protruding in the operative condition. The free ends of the arms 6, 16, 7, 17 have respective support legs 9 fit to find the ground, in the operative condition O in which the vehicle 2 is stopped and the arms 6, 16, 7, 17 are protruding therefrom.

Therefore in the operative condition, the device increases the base platform of the vehicle 2 avoiding oscillations and rollover risks caused by the movements of the barycenter projection consequent to the operative element movement.

The two front arms 6, 16 are tilted nearly symmetrically with respect to the longitudinal axle of the vehicle 2 forming, seen in plant, a "X" and are slidingly housed in respective housing means 15 fixed to the frame 8 for the free axial translation, slidingly, of the same front arms 6, 16.

To avoid, in the rest condition R, mutual mechanical interferences between the front arms 6, 16, these latter are positioned at different distances from the plane defined by the axles 4, 5 or the chassis 3 and therefore are vertically staggered in order to cross freely in an intersection point I approximately positioned in the

longitudinal plane of vehicle symmetry and corresponding to the center "X" of the front arms.

The front ends 10 of the two rear lateral arms 7, 17 are connected to the frame 8 by corresponding pivot means 11 whose rotation axles are nearly perpendicular to the plane, defined by the chassis 3 or by the axles 4, 5, and to the rear arms. In such way the rear arms parallely rotate with respect to the plane defined by the chassis or with respect to the plane of axles 4, 5 or, when the vehicle 2 is stopped on an horizontal ground, they rotate on a nearly horizontal plane

The pivot means 11 of each rear arm 7, 17 are fixed to the respective lateral edge of the frame 8 in immediately rear position of the rear side of the correspondent front arm 6,16 in the operative condition O.

The pivot means 11 are fixed in the position most advanced as possible behind the front arms and more external as possible with respect to the frame 8. In such way the pivot means 11 are positioned in front with respect to the intersection point I of the front arms.

In order to exploit the whole width of the vehicle 2 without increasing the plant shape, the frame 8, in correspondence with the pivot means 11 , has a width quite identical to that of the vehicle 2.

In the rest condition R, the front arms are crossed and the rear arms are aligned and drew near the chassis of vehicle 2 so that arms 6, 16, 7, 17 have minimum or no protrusion from the vehicle.

The device 1 has moving means 12 connected to frame 8 for the axial translation of front arms 6, 16 and comprising at least a translation chain or a rack actuated by a pinion operated by an electric controlled motor or by a hydraulic or pneumatic motor.

The device also includes actuators 13, for instance of linear electric kind, pneumatic or preferably hydraulic, having an end fixed to the frame 8 and the other end fixed to the respective rear arm 7, 17 for operating the rotation between the rest condition R, in which such arms 7, 17 are nearly parallel and placed side by side to the vehicle 2 and the operative condition to O in which said arms 7, 17 are wide apart and protruding from the vehicle 2.

The positioning of pivots 11 and front arms allows the realization of the frame 8 with a longitudinal length, with respect to the vehicle 2, comprised between a quarter and half of the transversal width of the frame 8 so resulting therefore extremely compact and light.

The rear arms 7, 17 have corresponding recesses 18 for housing the rear ends of the front arms 6, 16 in the rest condition R.

The operation of the device 1 provides that the stopped vehicle 2 is carried in the operative condition O by activating the moving means 12 and the actuators13, up to maximum protrusion of the arms 6, 16, 7,17 from the vehicle and the operation of the actuating means, hydraulic or manual screw, of the four support legs 9 up reaching the ground. The opposite procedure allows the return to the rest condition R.

In the first variant of figure 4, the rear ends of the front arms 6, 16 in the rest condition R do not reach the rear arms 7, 17 so differing from the device of figures from 1 to 3 because they are not provided with recesses 18.

The second variant of figure 5, in the operative condition O, provides that the front arms 6, 16 are of extensible, telescopic or more sliding element type and operated by respective hydraulic cylinders.

In the third variant of figures 6 and 7, the front and rear arms are telescopic or

two or more sliding elements. The front arms are extensible as in the variation of figure 5 and the rear arms are reducible to allow the rotation also in presence of side obstacles A as, for instance, poles and trees. In alternative the invention provides that also the rear arms 7, 17 are telescopic extensible to increase its protrusion in the operative condition O, so further extending the base platform.

In the fourth variant of figures from 8 to 10 the front arms 6, 16 are "V" displaced and positioned at the same distance from the plane defined by axles 4, 5 or by chassis so lying on a nearly horizontal plane.

The seat means 15 are in a sole body and are approximately "V" shaped with the vertex turned towards the rear axle.

The front arms 6, 16 are telescopic in two or more sliding elements and/or sliding and pivot means 11 are fixed to frame 8 near to the intersection of the side edge of this latter with rear edges of respective front arms 6, 16.

In the fifth variant of figures 11 and 12 the pivot means 11 are fixed to the frame 8 in intermediary position between the geometric axes of the front arms 6, 16, "X" displaced and spaced therefrom.

In the sixth variant of figures 13 and 14, pivot mean 11 of each rear arm 7, 17 is fixed to the frame 8 in rear position with respect to the front leg 16, 6 of the opposite side. The pivot means 11 are fixed to corresponding rear extensions 19 of the frame 8.

In the fifth and sixth variant, the frame 8 has a longitudinal length, with respect to the vehicle 2, comprised between half and double of the transversal width of the frame 8.

The withdrawal of the pivot fixing point to the frame of the fifth and sixth variants, allows to keep also a wide base platform with rear legs proportionally

shortened and without excessive frame weightings.

An advantage of the present invention is to provide a stabilization device for a parked vehicle that is light and therefore allows to increase the useful load of the vehicle.

Further advantage of the present invention is to provide a compact device and, at the same time, fit to supply a wide support surface which is advanced with respect to vehicle. Other advantage of the present invention is to provide a simple, economic, reliable and of sure operation device.