PIVOTABLE HYDRAULIC TELESCOPIC SUPPORTING LEG FOR A MOBILE LAND TRANSPORTING OR WORKING MACHINE AND MOBILE TRANSPORTING OR WORKING MACHING COMPRISING SUCH LEG

Abstract

The present disclosure provides supporting leg for a mobile land transporting machine such as a truck crane that is connectable with each beam on the chassis of the mobile transporting machine and telescopically extendable by means of a hydraulic media in a hydraulic circuit that extends from the beam towards the supporting leg. The supporting leg is, despite to the presence of the hydraulic circuit, pivotable at any angle around each axis on the beam. As such, the presence of any loose hydraulic conduits or other components of the hydraulic circuit that could protrude into the supporting leg and/or the beam is eliminated. To this aim, the supporting leg includes a ring-shaped hydraulic interface with flat front surfaces and an uninterrupted external circumferential surface and located adjacent to a bearing casing of the supporting leg and pivotally located on a hinge of each telescopic arm of the beam.

Claims

1. A pivotable hydraulic telescopic supporting leg for a mobile land transporting machine, comprising: a supporting leg including a tubular housing that is blinded on one side; and at least one hydraulic conduit of a hydraulic circuit connected to the tubular housing, wherein an opened end portion of the at least one hydraulic conduit includes a telescopic arm that is configured to be actuated via a hydraulic media available within the hydraulic circuit to move along an axis of the supporting leg, and wherein the blinded side of the tubular housing includes a tubular bearing casing that includes a central axis that extends perpendicularly with respect to the axis of the supporting leg, and wherein the supporting leg pivotally connected to a telescopic beam that is configured to mount to a mobile land transporting machine and that includes a tubular casing that is open on opposing terminal end portions that are each coupled to a telescopic arm that is configured to be actuated via the hydraulic media available within the hydraulic circuit and that includes an end portion that protrudes outside of a casing that is furnished with a hinge on which the supporting leg is attached via the tubular bearing casing pivotally around the axis of the supporting leg that extends perpendicularly with respect to a longitudinal axis of the supporting leg that is configured to be fixed in one or more desired position, and wherein the pivotable hydraulic telescopic supporting leg includes a ring-shaped hydraulic interface with flat front surfaces and an uninterrupted external circumferential surface, wherein the ring-shaped hydraulic interface is located adjacent to the bearing casing of the pivotable hydraulic telescopic supporting leg and is pivotally placed on the hinge of each corresponding telescopic arm of the telescopic beam, and wherein the ring-shaped hydraulic interface is configured to be pivoted at desired angles around an axis of the hinge and relative to the telescopic beam and is hydraulically sealed against the bearing casing on the pivotable hydraulic telescopic supporting leg well as against each hinge on the telescopic arm of the telescopic beam, and wherein the ring-shaped hydraulic interface includes an inner cylindrical surface with at least one circumferentially extending and uninterrupted groove that is spaced apart from front surfaces of the ring-shaped hydraulic interface and is configured to receive the hydraulic media from the hydraulic circuit (33), and wherein the ring-shaped hydraulic interface includes at least one hydraulic connector located in the area of the groove (24) and on an external surface of the ring-shaped interface and connected with a corresponding hydraulic conduit on the supporting leg and included in an electric circuit, and wherein the hinge includes a transversal passage through which the hydraulic media is configured to flow between the hydraulic circuit and the groove in the hydraulic interface.

2. The supporting leg of claim 1, wherein the ring-shaped hydraulic interface includes at least two separate grooves that are arranged on the internal cylindrical surface of the ring-shaped hydraulic interface, and that each extend in a circumferential direction and are spaced apart from each other in an axial direction of the interface, and wherein each of at least two separate grooves is hydraulically connected with at least one hydraulic connector on the external surface of the ring-shaped hydraulic interface so that the at least one hydraulic connector is configured to establish a hydraulic connection with the hydraulic conduit of the hydraulic circuit on the supporting leg, as well as a hydraulic connection through the passage in the hinge on the beam with each hydraulic conduit on the beam.

3. The supporting leg of claim 1, wherein with the supporting leg includes two hydraulic interfaces that are coaxial to each other and located adjacent to the bearing casing, and wherein each of the hydraulic interfaces is sealed on the hinge of the beam, is freely pivotable around the beam, and is configured to be hydraulically integrated into the hydraulic circuit, and wherein at least one conduit is configured to transport the hydraulic media between the beam and the supporting leg.

4. The supporting leg of to claim 3, wherein at least one of each of the hydraulic interfaces includes at least two separate grooves that are arranged on the internal cylindrical surface of the ring-shaped hydraulic interface and that extend in a circumferential direction and are spaced apart from each other in an axial direction of the ring-shaped hydraulic interface, wherein each of the at least two separate grooves is hydraulically connected with at least one hydraulic connector on the external surface of the ring-shaped hydraulic interface so that the at least one hydraulic connector is configured to establish a hydraulic connection with the hydraulic conduit of the hydraulic circuit on the supporting leg, and through the passage in the hinge on the beam with each hydraulic conduit on the beam.

5. The supporting leg of claim 1, wherein a hydraulic cylinder is provided as a housing for the supporting leg and is supplied with the hydraulic media from the hydraulic circuit, and wherein it's the telescopic arm is a piston rod that is configured to cooperate with the hydraulic cylinder.

6. The supporting leg of claim 1, further comprising: a mobile transporting machine including the supporting leg.

7. The supporting leg of claim 1, wherein: the mobile transporting machine is a mobile truck hydraulic crane including: at least one telescopic beam that is configured to mount onto a chassis of a vehicle that is configured to transport the mobile truck hydraulic crane, wherein the beam includes of a tubular housing that is open on opposing end portions that each include a telescopic arm inserted into the tubular housing and configured to move by means of the hydraulic media, while the end portion includes a hinge pivotally attached to the telescopic arm of the beam (3), and wherein the supporting leg includes a tubular housing that is blinded on an end portion and into which a telescopic arm is inserted that is longitudinally displaceable by means of the hydraulic media, and that includes a free end portion that is configured to engage ground and that includes a resting plate.

8. The supporting leg of claim 1, further comprising: a working machine including the supporting leg and the at least one hydraulic circuit connected to the supporting leg.

Description

DRAWINGS

[0016] The present disclosure will be described in more detail on the basis of an embodiment, which is presented in the attached drawing, in which

[0017] FIG. 1 is a front view of a pivotable hydraulic telescopic supporting leg of a mobile crane as one of possible mobile land transporting devices, namely in its mounted state and prior to use or during the use of such crane;

[0018] FIG. 2 is an isometric presentation of a beam of the crane according to FIG. 1, which is furnished with two supporting legs according to the present disclosure;

[0019] FIG. 3 is an isometric and explosion view of the beam of the crane according to FIGS. 1 and 2 with corresponding supporting leg according to the present disclosure;

[0020] FIG. 4 is an isometric and explosion view of a hydraulic interface of the supporting leg according to the present disclosure; and

[0021] FIG. 5 is a detail A according to FIG. 3.

DETAILED DESCRIPTION

[0022] Consequently, FIGS. 2 and 3 present a pivotable hydraulic supporting leg 1 for a mobile land transporting or a working machine, in particular for a truck hydraulic crane 30, which is presented in FIG. 1.

[0023] Similarly like the other modern state of the art supporting legs, the supporting leg 1 consists of a tubular housing 11, which is blinded on its one side, where at least one hydraulic conduit 331 of a hydraulic circuit 33 is connected thereto, while on its opened end portion 111 a telescopic arm 122 is inserted there-into, which is by means of a hydraulic media available within said hydraulic circuit 33 displaceable to and fro along a geometric axis 1001 of the supporting leg 1.

[0024] On the blinded end portion 111 of said housing 11 of the supporting leg 1 a tubular bearing casing 112 is available, the central axis 1002 of which extends perpendicularly with respect to said geometric axis 1001 of the supporting leg 1, namely in this particular case along a beam 3, which will be later-on described in more detail, but in general even transversally with respect to said beam 3, namely perpendicularly with respect to the longitudinal geometric axis thereof.

[0025] Said supporting leg 1 is pivotally connected to a telescopic beam 3, by which each mobile land transporting or working machine is mounted on a chassis of each disposable land vehicle, which is not shown in the drawings, and said beam 3 consists of a tubular casing 31, which is open on both terminal end portions and into which on each end portion 31, 31 a telescopic arm 32, 32 is inserted, which is movable to and fro by means of the hydraulic media available within said hydraulic circuit 33, usually by means of a suitable hydraulic cylinder.

[0026] Each telescopic arm 32, 32 is on its free end portion 320, which protrudes outside from said casing 31, furnished with a hinge 321, on which a supporting leg 1 is attached by means of its tubular bearing casing 112 and pivotally around the geometric axis 1002, which extends perpendicularly with respect to said longitudinal axis 1001 of the supporting leg 1, and said leg 1 can be fixed in each desired position.

[0027] In the shown embodiment according to FIG. 3 said supporting leg 1 can be fixed and secured against undesired pivoting or displacing in two positions, namely in its first position, in which it is faced towards the ground, and in its second position, in which it is faced away from the ground, which is assured by means of a pin 1277, which is insertable through passages 127 in a bearing casing 112 of the leg 1 and simultaneously through a transversal passage 327 in the bearing 321 of the telescopic arm 32, 32 of the beam 3.

[0028] The present disclosure proposes that said supporting leg comprises a ring-shaped hydraulic interface 2 with flat front surfaces 21, 22 and uninterrupted external circumferential surface 23, wherein said hydraulic interface 2 is arranged adjacent to said bearing casing 112 of the supporting leg 1 and is analogously like said casing 112 of the supporting leg 1 itself pivotally placed on the hinge 321 of each corresponding telescopic arm 32, 32 of the beam 3.

[0029] In this, said interface 2 is allowed to be pivoted at each desired angle around said axis 1002 of the hinge 321 and relatively to said beam 3 and is by means of a suitable sealing assembly 25 in the area of both flat front surfaces 21, 22 hydraulically sealed both against said bearing case 112 of the supporting leg 1 as well as against to each belonging hinge 321 on the telescopic arm 32, 32 of the beam 3. Besides, said hydraulic interface 2 is on its inner cylindrical surface 24 furnished with at least one circumferentially extending and uninterrupted groove 24, which is arranged at sufficient distance apart of said front surfaces 21, 22 and is adapted to receive a hydraulic media from the hydraulic circuit 33.

[0030] Said hydraulic interface 2 is moreover furnished with at least one hydraulic connector 241, 242, which is arranged in the area of said groove 24 and is on the external surface 23 of said interface 2 connected with a corresponding hydraulic conduit 331, which is arranged on the supporting leg 1 and belongs to said electric circuit 33, wherein said hinge 321 is furnished with a transversal passage 321, through which the hydraulic media is able to flow from the hydraulic circuit 33 towards the area of said groove 24 in said hydraulic interface 2.

[0031] Thanks to said interface 2 with at least one groove 24 and each desired number of hydraulic connectors 241, 242 arranged on the external surface 23 thereof, the hydraulic media in the hydraulic circuit 33 is regardless to each current position of the supporting leg permanently allowed to flow freely 1 from the hydraulic conduit 333 in the area of the beam 3 through the passage 321 in the hinge 321 on the beam 3 and through the connectors 241, 242 and said groove 24 in the interface 2.

[0032] Especially when the hydraulic circuit 33 in the area of the beam 3 and the supporting leg 1 comprises at least two branches, for example the first one for powering the cylinder of the supporting leg 1 and the second one for powering of another independent hydraulic appliance located on the supporting leg 1, said hydraulic interface 2 can be furnished with at least two separate grooves 24, which are arranged on the internal cylindrical surface 24 of the interface 2 and each per se extend in the circumferential direction thereof and are spaced apart from each other in the axial direction 1002 of the interface 2, wherein each of them is hydraulically connected on the one hand with at least one hydraulic connector 241, 242 on the external surface 23 of said interface 2, so that said at least one hydraulic connector 241, 242 is suitable for establishing of a hydraulic connection with the hydraulic conduit 331 of the hydraulic circuit 33 on the supporting leg 1, and on the other hand also through the passage 321 in the hinge 321 on the beam 3 with each belonging hydraulic conduit 333 on the beam 3.

[0033] In accordance with a further possible embodiment, the supporting leg 1 according to the present disclosure is furnished with two hydraulic interfaces 2, which are coaxially arranged closely to each other and adjacent to said bearing casing 112, and each of them is sealed on the hinge 321 of the beam 3 and is freely pivotable around it substantially together with the belonging supporting leg 1 and is moreover adapted to be hydraulically integrated into a hydraulic circuit 33, at least one conduit 331, 332 of which is adapted for transporting the hydraulic media from the area of the beam 3 towards the area of the supporting leg 1, and/or vice versa. Such embodiment should be taken in consideration in particular when the hydraulic circuit 33, in addition to the hydraulic conduit 331 required for powering of the telescopic supporting leg 1 itself, also comprises at least one further conduit, which is intended for powering of at least one further hydraulic appliance, e.g. of a hydraulic motor or similar hydraulic powering means, which can be located in the area of said supporting leg. In such case, at least one of each disposable hydraulic interfaces 2 is furnished with at least two separate grooves 24, which are arranged on the internal cylindrical surface 24 of the interface 2 and each per se extend in the circumferential direction thereof and are spaced apart from each other in the axial direction 1002 of the interface 2, wherein each of them is hydraulically connected on the one hand with at least one hydraulic connector 241, 242 on the external surface 23 of said interface 2, so that said at least one hydraulic connector 241, 242 is suitable for establishing of a hydraulic connection with the hydraulic conduit 331 of the hydraulic circuit 33 on the supporting leg 1, and on the other hand also through the passage 321 in the hinge 321 on the beam 3 with each belonging hydraulic conduit 333 on the beam 3.

[0034] Said supporting leg 1 can be easily realized in such manner that a hydraulic cylinder is used as its housing 11, and is supplied by the hydraulic media from the hydraulic circuit 33, while its telescopic arm 12 is a piston rod, which is adapted to cooperate with said cylinder.

[0035] A mobile transporting machine, which is shown in FIG. 1, comprises at least one supporting leg 1 according to the present disclosure. The shown machine is a mobile truck hydraulic crane 30 with at least one telescopic beam 3, which is mountable onto a chassis of each disposable vehicle, which is foreseen for transporting of said crane 30 to each desired location, and is furnished with a pair of supporting legs 1 according to the present disclosure. Also in this case, said beam 3 is telescopically conceived and consists of a tubular housing 31, which is open on its both end portions 31, 31, and wherein on each end portion 31, 31 a telescopic arm 32, 32 is inserted into said housing 31 and is movable to and from by means of the hydraulic media. The free end portion 320 of each of said arms 32, 32 a hinge 321 is arranged, in the area of which a supporting leg 1 is pivotally attached to said telescopic arm 32, 32 of the beam 3, said leg 1 consisting of a tubular housing 11, which is blinded on its one end portion and into which a telescopic arm 12 is inserted, which is longitudinally displaceable to and from by means of the hydraulic media and a free end portion 121 of which is adapted to be rest on each disposable ground and is optionally furnished with a resting plate 122 with enlarged resting surface.

[0036] Said supporting leg 1 is quite analogous like in the previously described crane also applicable on working machines like excavators, drilling or similar machines, which during exploitation thereof at least from time to time require a reliable support, either due to providing stability when exposed to loadings, or simply due to positioning thereof in each desired level.

[0037] However, each of such working machines within the scope of this present disclosure is furnished with at least one supporting with features, which are disclosed in this specification and also in the claims, and moreover, such working machine must also also furnished with at least one hydraulic circuit 3, to which said supporting leg 1 is hydraulically connected, by which then proper functioning of the supporting leg 1 is enabled.