DE9006068U1 - Boom for a backhoe or similar - Google Patents

Description

Atlas Weyhausen GmbH, Stedinger Str. 124, 2870 Delmenhorst Boom for a spoon or similar.

The invention relates to a boom for a shovel excavator or the like, consisting of (at least) two first and second arms that are connected to one another in an articulated manner (representing boom sections), which can be pivoted relative to one another by means of a piston-cylinder arrangement (generally consisting of two piston-cylinder units arranged essentially parallel to one another), which runs in front of or below the connecting line through the two articulation parts (on the device frame or on the second arm) of the first arm, whereby one (first) arm is articulated on the device frame and the articulation point of the piston-cylinder arrangement on the second

-&Lgr;« Office Bremen / Bremen Office: Office Munich/Munich Offlee &idiagr;&eegr;

Kollerallee 32, D-2800 Bremen 1 WldenmayentraBc 4. D-8000 Munich 22 Pot compartment / POBox 10712? Pottfach IV O. Box 22 0137 Telephone: (04 21) *34 90 71 Telephone: (C891* 22 3311 Telex: 244 951 bopatd Telex: 524 282 forbod Ti'if·«: (04 2!) 54696^CCnTHJ-!!! Te!·*«: '089^22 !5*9CC!TT!!+!!! Ctblet: Diagram Bremen Cables: free patent Munich

Deutsche Bank, Bremen Bremer B|uil( BreituSi '.',,, ', ', Hypotwrtc, Munich PSchA Hamburg

(BLZ29070050) 1112002 (BLZ290100W>) W 14)1 POOt .· J (BlÄ70Q20001)6400194333 (BLZ20010020) 126083-202

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t · ··· · in the • - . poor BOEHMERT & ÖDEHMER ¹
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with distance to the pivot point of the second •
Poor on the first poor is arranged. A such in view of its regular hydraulic operated piston-cylinder arrangement Practice also as

A boom referred to as a "hydraulic* ¹ adjustable boom" is known in which the piston-cylinder arrangement serves to extend or shorten the (entire) boom depending on the work task to be performed (or driving position) and is arranged on the front or underside of the boom in such a way that the piston-cylinder arrangement consisting of two parallel, hydraulic piston-cylinder units is articulated at one end to a front lateral section of the first boom arm (laterally), while at its other end (with the two piston rods) it is articulated laterally to the second arm.

Such a generic design, in which the piston-cylinder arrangement is arranged on the underside or front of the boom, brings with it the considerable advantage that the boom arm can be supported on the relatively large piston surface of the piston-cylinder arrangement, which is particularly advantageous in the case of relatively large loads or other loads.

Another advantage of such an arrangement is that the point of the highest bending moment (in the second arm of the boom) is not where the two arms are connected, especially at the

Connection point is also known to have the torque to/

must be initiated when twisting the arm.

v A certain disadvantage of this previously known boom arrangement

■ is that the side profile of the boom is

the piston-cylinder arrangement is also determined. Because both

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BOEHMERT ÄBÖEHMEltt ' " - 3 -

In the parallel position (which is relatively uncritical) as well as in the working positions, the piston-cylinder arrangement with the sections of the two arms facing each other clearly forms a triangle, and also in the top view or projection, the piston-cylinder units of the piston-cylinder arrangement in the above-described design from the prior art protrude laterally at least over the second arm (usually over both arms).

In an effort to reduce the side profile (in side view) so that the piston-cylinder arrangement does not hinder the excavation work or similar to be carried out, a design has also become known in which the piston-cylinder arrangement is designed in the manner of a so-called neck cylinder (see e.g. DE-GM 85 12 238.6). With such a boom design, the side profile is relatively favorable, but this is achieved at the cost of considerable technical disadvantages. Because in a design such as that known from DE-GM 85 12 238, the ring side of the piston-cylinder arrangement arranged as a so-called neck cylinder is obviously subjected to extremely high loads, especially in the area of the highest load, and must therefore be dimensioned accordingly robustly from the outset, and in extreme load cases still suffers (sometimes considerably) from the boom arrangement.

Another significant disadvantage is that in the boom design discussed above, the connection point between the two arms, also known in practice as the clamping point, is also the point of the highest bending moment in the (second) arm, so that the torque caused by/when twisting the arm must be introduced and absorbed at the point of the highest bending moment, which in turn leads to considerably higher strength requirements.

BOEHMERT & BOEHMERT - 4 -

The present invention is therefore based on the task of improving the boom of the type described at the beginning, in particular avoiding its aforementioned disadvantages, in particular in such a way that - with basically the same (front shoulder) kinematics as that of the boom described at the beginning of the state of the art - a (significantly) smaller side profile can be achieved, both (and in outer dimensions) in a side view as well as in a view from above (projection) in order to enable work to be carried out without problems under difficult conditions, such as those that are common in earthworks, where the boom very often has to be guided between retaining elements such as strut rods, which was sometimes not possible at all with the state of the art and, moreover, often led to damage to the piston-cylinder arrangement.

The solution to this problem is characterized according to the invention in that the piston-cylinder arrangement runs at least partially - preferably essentially completely - inside the first arm, and in order to achieve an even greater protective effect for the piston-cylinder arrangement, preferably in such a way that the piston-cylinder arrangement is hinged to the device frame or to the second arm in such a way that the cylinder(s) is (are) at the top and the piston rod(s) at the bottom.

The piston-cylinder arrangement is preferably hinged to the underside of the second arm, preferably in such a way that it runs substantially parallel to the longitudinal axis of the first arm.

Preferred embodiments of the present invention are

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BOEtitaEFtt'&r fe'OEHMERT

- 5 described in the subclaims.

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

Fig. 1 is a side view of a (deep-lift) boom in a driving position provided with a boom according to the invention; and

Fig. 2 the (reduced) excavator

according to Fig. 1 in a so-called motion image.

The drawing shows a backhoe, designated as a whole with l, with a boom, designated as a whole with 2, which - as far as the explanation of the above invention is concerned - essentially consists of two (first and second) arms 3 and 4, respectively, which are connected to one another in an articulated manner, which can be pivoted relative to one another by means of a piston-cylinder arrangement 5, the piston-cylinder arrangement 5 consisting of two piston-cylinder units 6 running parallel to one another, of which only one piston-cylinder unit can be seen in each of the two drawing figures.

As is readily apparent to the person skilled in the art, the boom 2 itself has a further (third) arm 7, which is connected in an articulated manner to the front end section of the second arm 4 and carries a (deep) bucket 8 at its free end. However, this third arm 7 is irrelevant to the present invention and is therefore essentially not considered in the following.

The first arm 3 of the boom 2, which in practice is also known as

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"SSuIe" is hinged at 9 to the device frame 10, more precisely to the upper frame 11 of the device:*tthiuens
10/ which can be rotated or pivoted about a (vertical) axis of rotation 12 relative to the subframe 13.

Furthermore, it can be seen from the drawing that the articulation point 14 of the piston-cylinder arrangement 5 on the second arm 4
with distance a to the articulation point 15 of the second arm 4 air
first arm 3.

As has already been explained, the piston-cylinder unit 6, 6, which consists of two parallel piston-cylinder units 6, 6,
Piston-cylinder arrangement 5 practically in the first arm 3
integrated, i.e. essentially completely within the
first arm 3 and extends essentially parallel to the longitudinal axis of the first arm 3, the piston-cylinder arrangement 5 being recognizable on the underside 16 of the
second arm 4, namely the two
Piston-cylinder units 6, 6 are each hinged to a nose-shaped extension 17 of a side wall 18 of the second air chamber 4.

The linkage parts IS of the piston-cylinder arrangement 5 on
first arm 3 is located just above the articulation point 9 of the
first arm 3 on the device frame 10.

The piston-cylinder arrangement 5 is thus on the first arm 3
or hinged to the second arm 4, so that dl«, avoid cylinders 5' ■ are at the top and the piston rods 5" are at the bottom,

so that the piston-cylinder arrangement 5 not only by its inventively provided integration into the first arm 3

I; of the boom 2 is already excellently protected, but

Furthermore, in such a way that (see Fig. 2) in
Cases in which the piston-cylinder units &dgr;, 6 (slightly) freely between the first arm 3 and the second arm 4

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BOEHMERT

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vox is standing. Flg. 2), this free section is a cylinder section and not a piston rod section.

As is readily apparent and understandable for the competent person skilled in the art, the present invention creates a boom which - while avoiding all the disadvantages of the prior art - meets the requirements placed on it in an almost optimal manner: The boom according to the invention has an extremely small side profile not only in a side view, but also in a view from above or in projection, so that it can work without problems even under difficult conditions, as are almost always the case in earthworks, but it is also ideally designed in terms of strength in that the greatest bending moment does not occur at the connection point between the first and second arms 3 and 4 of the boom 2, where the torques must also be introduced during rotation; and finally, due to the arrangement of the piston-cylinder arrangement 5 being at least essentially integrated into the first arm 3 ("column"), an almost optimal protection of the piston-cylinder arrangement 5 against any external influences is achieved, whereby the - compared to a "neck cylinder" - L

m linder arrangement" - advantageous effect is retained, as was initially explained with reference to the previously described prior art ^.

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File: W 1403 /I

LIST OF REFERENCE (NTMSEAXS)

(Backhoe) excavator

2 booms (of 1) P ^ first) arm *-&tgr;&ogr;&eegr; 2) (= column) ^ (second) arm (of 2) ^ Piston-cylinder arrangement (for 3, 4) 5 ^l - Cylinder (of 6) ₆ KolLerr cylinder units 5" - Kalbenstane (ve &eegr; (third) arm (of 2) 7 3 buckets g Articulation point (of 3) q 10 Device frames 10 11 Upper frame (of 10) 11 12 Rotation axis 1? 13 subframes (of 10) 13 14 articulation point (from 5 to 4) 14 15 Articulation point (of 3/4) 1<5 15 subpage (of 4) 16 17 nasal changes 17 13 side walls (of 4) 18 19 articulation point (of 5) 1Q 20 20 21 21 22 22 23 23 24 24 25 P«5 Pfi 26 27 27 28 28 29 29 50 30

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Claims (8)

Atlas Weyhausen GmbK, stedinger Str. 324. 2870 Delmenhorst Boom for a backhoe or similar claims HSBEBSsaSICESS:= 1. Boom for a shovel excavator or similar, consisting of (at least) two first and second arms which are connected to one another in an articulated manner and which can be pivoted relative to one another by means of a piston-cylinder arrangement which runs in front of or below the connecting line through the two articulation points of the first arm, wherein one (first) arm is articulated to the device frame and the articulation point of the piston-cylinder arrangement on the second arm is arranged at a distance from the articulation point of the second arm on the first arm, 518 Office Bremen / Bremen Office: Hollerallee 32, D-MOO Bremen 1 Pottfach/P.O.Box 107127 Telephone: (04 21) «349071 T*lex:244Q5ehnnj>id Fax: (04 21) 34 69 «8 CCrffif+ &Idigr;&Igr;&Idigr; CeBlM: Diagram Bremen German Bank, Bremen
(Bank code 290 700 50) 1112002 Bremen Bank? Office Mönchen/Munich Office m» WidenmavcntraSe 4. D-8000 Munich Poitfach/F.O.Box&OlS? Telephone: (089)* 22 3311 Ttkttx. (089)2215"69CClTriI+UI Cablet: Telepatent Munich , Munich 0001)64 PSchA Hamburg (Bank code 200100 20) 1260 83-202 &bull; t · »fs· · »ait · »» &igr; ·· ····«■ ■ · · &igr; > &igr;&igr; a &igr;&igr; ■ » · · characterized in that the piston-cylinder arrangement (5) runs at least partially within the first arm (3) or is integrated into it. 2. Boom according to claim 1, characterized in that the piston-cylinder arrangement (3) runs essentially completely within the first arm (3). 3. Boom according to claim 1 or 2, in particular according to claim 2, characterized in that the piston-cylinder arrangement (5) runs essentially parallel to the longitudinal axis of the first arm (3). 4. Boom according to claim 3, characterized in that the piston-cylinder arrangement (5) is articulated on the underside (16) of the second arm (4). 5. Boom according to claim 4, characterized in that the side walls (18, 18) of the second arm (4) at the articulation point of the piston-cylinder arrangement (5) are nose-shaped and extended downwards (see 17). 6. Boom according to one or more of the preceding claims, in particular according to claim 5, characterized in that the articulation point (19) of the piston-cylinder arrangement (5) on the first arm (3) is located just above its articulation point (9) on the device frame (10). 7. Boom according to one or more of the preceding claims, in particular according to claim 5 or 6, characterized in that the piston-cylinder arrangement (5) consists in a manner known per se of two piston-cylinder units (6, 6) running essentially parallel to one another. · · · I I · 4 &bull; ftf I I I I The 4 * 8. Boom according to one or more of the preceding claims, characterized in that the piston-cylinder arrangement (5) is articulated on the first arm (3) or on the second arm (4) in such a way that the cylinder(s) (5 ¹ ) is (are) at the top and the piston rod(s) (5") at the bottom.