DE9319939U1 - Mobile excavator with a support and dozer blade - Google Patents

Description

Mobile excavator with a support and dozer blade

The invention relates to a mobile excavator with a boom provided with a working tool (such as a bucket) at its free end, and a (support and leveling) shield generally arranged at the opposite end section of the mobile excavator for supporting the mobile excavator during excavation operation or for leveling a surface, which is articulated on the undercarriage of the mobile excavator with a parallel link arrangement consisting essentially of a pair of parallel links arranged at a mutual horizontal distance in a first plane and a torsionally rigid parallel link arrangement arranged in a second plane parallel to the first plane.

Bremen:

Hollerallee 32, D-28209 Bremen Post/. 10 71 27, D-28071 Bremen

Telephone (04 21) 3 40 90 Fax (0421)3 4917 68 Telex 244 958 bopat d

Berlin:

Uhlandstrasse 173/174 D-10719 Berlin

Munich:

Franz-Joseph-Strasse D-80801 Munich

Telephone, &phgr; 30VS 8110.36 . . Tefcphon. (p.89).3,4 70 Telefax; ((J30)&xgr;81 3SJ27J JTelef^c (,0*8$) 34«70 Telex ·1 §3 ,661£&ogr;&eegr;&ogr;·&agr; ·· «Tete* 624 286 farbe d Leipzig:

Phillip-Rosenthal-Strasse 21 D-04103 Leipzig

Telephone (03 41) 29 44 28 Fax (03 41)3103 25

Dusseldorf.

Neßlerstrasse D-40593 Düsseldorf

Telephone (02 11) 71 89 Fax (0211)7 18 27

BOEHMERT & BOEHMERT, NORDEMANN and PARTNERS.

(so that the cutting angle of the blade is always essentially constant), which is to be operated by means of a piston-cylinder arrangement.

Mobile excavators must regularly be equipped with a support device in order to create an (additional) abutment during excavation operation, which counteracts the tipping moment generated by the excavator forces in order to prevent the excavator from lifting off the ground (i.e. tipping or swiveling up around a horizontal axis). Such a support device can consist of support feet. However, it is also often designed as a shield, especially since this can also be used for leveling if it is suitably designed or arranged (outside of excavation operation).

For example, a mobile excavator is known whose blade is pivotally mounted or hinged to the undercarriage of the mobile excavator with a handlebar and is operated by a hydraulic cylinder. This blade can only be used for support during excavation work (and not for leveling) because the cutting angle of the blade changes constantly with its lift, since the blade is moved in a circular arc when raised or lowered due to the linkage to the undercarriage described above.

Furthermore, a mobile excavator with a blade is known which always has a constant cutting angle regardless of its lifting position, so that it can also be used for leveling work and is therefore also referred to as a support and leveling blade. The constant cutting angle, regardless of the lifting position of the blade, is achieved by the blade being attached to the lifting truck with a parallel link arrangement.

BOEHMERT & BOEHMERT, NORDEMANN and PARTNERS

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When leveling, the problem arises that the blade must not twist due to one-sided resistance - viewed in the direction of travel - when the excavator is stationary or when it is being moved on a flat, leveled surface, as this would otherwise result in extremely poor leveling results. In particular, when setting up the blade during leveling work, it is not uncommon for the blade to touch down on one side, for example, so that the entire excavator (via the blade and the piston-cylinder arrangement that operates it) has to be raised so that the axle and blade remain parallel.

In order to achieve the required twisting or torsional rigidity of the shield or its linkage, the two lower links of the parallel link arrangement in this previously known mobile excavator are connected to a torsionally rigid connecting element, so that - together with this connecting element - they are designed as a "lifting beam" on which, in the top view, a hydraulic piston-cylinder unit of the piston-cylinder arrangement acts on the left and right of the excavator's longitudinal axis, so that the forces introduced laterally into the "lifting beam" are introduced by the "lifting beam" as a force couple into the undercarriage and the excavator can be rotated if necessary - generating correspondingly large internal forces in the "lifting beam".

The disadvantage of designing the support device as support feet is that with such a design no leveling work can be carried out with the mobile excavator. However, it has the considerable advantage that when supporting the excavator (during excavation work) with support feet on a paved road (particularly

BOEHMERT & BOEHMEKT, NORDEMANN and PARTNERS,

(especially on asphalt surfaces) no support markings are produced, as is the case when supporting using a shield, because the blade of the shield often presses into the surface or damages it in some other way.

Furthermore, support by means of outriggers is advantageous if the excavator has to support itself at different heights on the right and left, for example on a road on the one hand and on the curb on the other.

Although the previously known mobile excavator described above, whose lower links are designed as a "lifting beam", has two piston-cylinder units, it is practically impossible to remove the blade if necessary and instead attach support feet to the "lifting beam". This would require a detachable connection in the lifting beam, which is practically impossible due to the high forces. For the reasons mentioned above, support feet are often required, particularly for smaller excavators that mainly work in inner-city areas.

The present invention is therefore based on the object of creating a mobile excavator of the type described at the beginning, in which the support and dozer blade can be easily replaced with support feet.

This object is achieved according to the invention in that the (not designed as a "lifting beam", torsionally flexible) pair of links forms the lower links of the parallel link arrangement, and that the torsionally rigid connecting arrangement is essentially centrally located between the two links

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is arranged above this pair of links. As will be explained further below using an example, the shield is held torsionally rigid to the undercarriage in this design when a one-sided force acts on the shield.

The torsionally rigid connection arrangement preferably consists essentially of a pipe section which is hinged at one end section to the shield and at its other end section to the undercarriage.

In order to achieve simple and problem-free assembly and disassembly of the blade on the one hand and the support feet on the other, the connection arrangement and/or the guides are preferably each connected to the blade or the undercarriage with plug pins or the like.

Preferably, the piston-cylinder units of the piston-cylinder arrangement are controlled in such a way that they can be controlled in parallel when the blade is mounted and individually when the blade is removed and the support legs are instead hinged to the undercarriage.

Preferred embodiments of the present invention are described in the subclaims.

The invention is explained in more detail below using an embodiment with reference to a drawing. It shows:

Fig. 1 a side view of the rear part of a previously known mobile excavator with a support and dozer blade;

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Fig. 2 is a sectional view along the section line II-II in Fig. 1, i.e. a top view of the lower pair of handlebars designed as a "lifting beam";

Fig. 3 is a plan view of the upper pair of handlebars seen in the direction of arrow III in Fig. 1;

Fig. 4 an inventive design of the

Parallel link arrangement with mounted support and dozer blade; and

Fig. 5 shows a support leg hinged to the excavator instead of the blade - just like Fig. 4 - in side view.

Fig. 1 to 3 show the rear part of a known mobile excavator, designated as a whole by 1, which is provided at its other end section, not shown, with a boom carrying a working tool such as a bucket, and at the end section of its undercarriage 2 shown, a support and dozer blade 3, hereinafter also referred to as a shield, for supporting the mobile excavator 1 during excavation operation or for dozing a surface.

The blade 3 is connected to the undercarriage 2 by a parallel link arrangement 4, designated as a whole by 4, and is shown in Fig. 1 with solid lines in a lowered leveling position and with dashed lines in a raised position. It can be seen that the cutting angle is always constant due to the connection of the blade 3 by means of a parallel link arrangement 4.

BOEHMERT & BOEHMERT, NORDEMANN and PARTNERS.

The parallel link arrangement 4 consists of a pair of parallel upper links 5.1 and 5.2 arranged at a mutual horizontal distance in a first plane, which can be seen in particular in Fig. 3, and a pair of lower links 6.1 and 6.2 arranged in a second plane parallel to the first plane, the latter being connected to one another by means of a connecting arrangement 7 designed as a pipe section (torsionally rigid).

The lower links 6.1 and 6.2 are each connected to the blade 3 by means of a front joint 8 and to the undercarriage 2 by means of a rear joint 9, while the upper links 5.1 and 5.2 are each connected to the undercarriage 2 by means of a front joint 10 and a rear joint 11. Each joint 8 to 11 has eyes and a lockable, yet easy to assemble and disassemble, plug pin 13.

As already described at the beginning, this known design is highly practical compared to a design in which the shield can only be used as a support shield, but it does not allow the shield 3 to be replaced (at reasonable expense) with support feet, as is often highly desirable for the reasons mentioned above.

Such an embodiment according to the invention is explained in Figs. 4 and 5, wherein the same reference numerals are used for identical or corresponding parts as in the illustration according to Figs. to 3.

In the embodiment according to the invention shown in Figs. 4 and 5 (in particular in Fig. 4), the

BOEHMERT & BOEHMERT, NORDEMANN and PARTNERS.

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The non-torsion-resistant pair of links, the lower links and 6.2 of the parallel link arrangement 4, is therefore no longer connected to one another by a torsion-resistant pipe section 7 as in the design according to Fig. 1 to 3, and the upper links 5.1 and 5.2 are omitted. The upper links 5.1 and 5.2 and the torsion-resistant pipe section 7 are connected by a pipe section 7 above the lower links.

6.1 and 6.2 and centrally between the links 6.1 and 6.2 (in the plan view rotated by 90° compared to the design according to Fig. 1 to 3) pipe section 7', which is hinged at one end section to the shield by means of a joint 10' and at its rear end section to the undercarriage 2 by means of a joint 11'. Here too, the lower links 6.1 and

6.2 as well as the pipe section 7' are each connected to the shield 3 or the undercarriage 2 with a pin 13, so that the shield 3 can be dismantled very easily in order to replace it with support feet 14 (see Fig. 5).

Before doing so, it should be pointed out that the hydraulically operated piston-cylinder units 15, of which only one can be seen in Fig. 4 (their piston rods 15' can be seen in Fig. 2), are controlled in such a way that they can be controlled in parallel when the shield 3 is mounted and individually when the shield 3 is dismantled and the support feet 14 are hinged to the undercarriage 2 instead.

As can be seen from Fig. 5, the support feet 14 each consist of a claw-like foot head 16 which is articulated to a support leg 17, wherein the upper end section of the support leg 17 in the assembled state of the support feet 14, 14 is articulated to an eye 12 of a joint 9 arranged on the undercarriage 2, and the piston rod 15' of a

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Piston-cylinder unit 15 is connected to the lower end section of the support leg 17 or the foot head 16 in the manner shown in Fig. 5.

It is readily apparent that the design according to the invention makes it very easy to replace the shield 3 with the support feet 14, 14. To do this, the shield 3 only needs to be released from the lower links 6.1 and 6.2 and from the connecting arrangement 7 ¹ designed as a pipe section by pulling the corresponding plug pins 13, 13, if necessary by pulling the rear plug pin 13 together with the pipe section 7'. Then only the support legs 17 of the support feet 14 need to be hinged to the undercarriage 2, again with the plug pins 13, and the piston-cylinder units 15 to the support feet 14 (see Fig. 5). With a suitable design, the support legs can even be designed to be identical to the lower links 6.1 and 6.2.

BOEHMERT & BOEHMERT, NORDEMANN and PARTNERS.

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LIST OF REFERENCE SYMBOLS

1 Mobilebaacrer 1 CSL Underarms (of 1) CSL 3 (Support and leveling) blade 3 4 Parallel link arrangement 4 5 upper handlebar 5 6 lower handlebar 6 7. 7' Connection arrangement (6.1/6.2) 7 OO front joints (of 6) 8th 9 rear joints (of 6) 9 10. 10' front joints (of 5) 10 11. 11' rear joints (of 5) 11 12 Auaen 12 13 Socket bolt 13 14 Support feet 14 15 Piston-cylinder units (15 ¹ Piston rods of 15) 16 FootcoDf (of 14) 16 17 Support leg (of 14) 17

Claims (6)

Mobile excavator with a support and dozer blade 1. Mobile excavator with a boom provided with a working tool at its free end and a (supporting and leveling) blade, which is articulated to the undercarriage with a parallel link arrangement consisting essentially of a pair of parallel links arranged at a mutual horizontal distance in a first plane and a torsion-resistant connecting arrangement arranged in a second plane parallel to the first plane, which is to be actuated by means of a piston-cylinder arrangement, characterized in that the pair of links support the lower Bremen: Hollerallee 32, D-28209 Bremen Postf. 10 71 27, D-28071 Bremen Telephone (04 21) 3 40 90 Fax (0421)3 49 17 68 Telex 244 958 bopat d Berlin: Uhlandstrasse 173/174 D-10719 Berlin Munich: Franz-Joseph-Strasse D-80801 Munich Telephone. (0 30V8 81 10.36 .. Telfjjhop.(ft,89).3.4 70 Telefax; ($30) &xgr;81 39J27; JTJlefaJ &phgr;·8|) 34J70 Telex '!53.661JrOmJd · · ;Tele* S24 28ß for!»» d Leipzig: Phillip-Rosenthal-Strasse D-04103 Leipzig Telephone (03 41) 29 44 Fax (03 41) 31 03 Dusseldorf: Neßlerstrasse D-40593 Düsseldorf Telephone (02 11)7189 Fax (02 11)718 27 BOEHMERT & BOEHMERT, NORDEMANN and PARTNERS. Control arms (6.1, 6.2) of the parallel control arm arrangement (4); and that the torsion-resistant connecting arrangement is arranged essentially centrally between the two control arms (6.1, 6.2) above the cup pair (6.1, 6.2). 2. Mobile excavator according to claim 1, characterized in that the torsion-resistant connection arrangement consists essentially of a pipe section (7 ¹ ) which is articulated at one end section to the shield (3) and at its other end section to the undercarriage (2). 3. Mobile excavator according to claim 2, characterized in that the links (6.1, 6.2) and/or the connecting arrangement (7 ¹ ) are each secured to the shield by means of plug pins (13) or the like. (3) or the undercarriage (2). 4. Mobile excavator according to one or more of the preceding claims, characterized in that the piston-cylinder units (15, 15) of the piston-cylinder arrangement are controlled in such a way that they can be controlled in parallel when the shield (3) is mounted and individually when the shield (3) is dismantled and the support feet (14) are hinged to the undercarriage (2) instead. 5. Mobile excavator according to claim 4, characterized in that the support feet (14) each have a claw-like foot head (16) articulated to a support leg (17), the upper end section of the support leg (17) being articulated to an eye (12) arranged on the undercarriage (2) for the alternative articulation of a handlebar (6.1) in the assembled state of the working feet (14, 14), and a piston-cylinder unit (15) of the piston-cylinder arrangement being articulated to the lower end section of the support leg (17) or the foot head (16). BOEHMERT & BOEHMERT, NORDEMANN and,PARTNER, 6. Mobile excavator according to claim 5, characterized in that the support legs (17) are the lower links (6.1, 6.2).