DE6931445U - CROWBAR FOR CLEAVING STUBS - Google Patents

Description

PATENTANWALT DIPL.-ING ,, ·., · * .. * '..''·'·>'* - HERBERT HAMMERMANN ₈₅ oo Nuremberg, a «, June 6, 1970

"SAIcgelstrasse 35

t Eof: 593693 Wire: PathammerNOrnberB "

Bank account: Dresdner Bank, Nuremberg ι Depoiitenkaiie Rathenaoplatz No. 73664 ■ Bayer.Vereinsbank No. 5906393 Current account: Stadtsparicasse Nürnberg 8819 · \ Postal checking account: Office Nürnberg47706

Ing.Heinrich Willwacher, 5238 Hachenburg, Gerberweg 9

Crowbar for clearing stumps

The innovation concerns a crowbar for clearing stumps, which is characterized by its particularly high efficiency and high performance.

It is known to clear stumps using a backhoe use and attach a pickaxe-like tool to the head of the backhoe at an angle to its axis and after swiveling the tool tip in approximately horizontally in pulling the stump upwards to pull the stump out of the earth beneath a stump. The pulling power the stump can in the highest case become so large that the excavator is just not at the front end the caterpillar is tipped away after the stump. So here the weight of the excavator essentially determines the Maximum force with which a stump can be pulled upwards. The bigger the excavator, the bigger is its pulling force to pull out a stump. But the heavier an excavator, the more expensive it is Use and the sooner it will sink into the soft and often swamp-like soil of the forest. Through the This disadvantage is avoided by innovation.

All -.nOndlidicn versions are without ίΙ ^ ζΙ ^ BfuJi ^ ifQm ^ rQooJch.yQrfaUangsort and Ceriditsstand for both parts of Nuremberg.

PATENT Attorney DIPL-ING. H. HAMMERMANN, 8500 NUREMBERG, SCHLEGELSTRASSE 25

to: concerning: date: page:

DPA. G 69 31 445.0 6.6.70 2

The innovation is that a crowbar at the working end of a hydraulic excavator is used to clear stumps is centrally mounted and its end opposite the crowbar point with the piston rod of a hydraulic excavator is articulated. The shape and size of the crowbar are advantageously adapted to the type of use. A vertical hydraulic actuation of the crowbar is also part of the innovation. There can also be several Crowbar tips are mounted one above the other or next to one another, if the use makes that seem good.

On the basis of an embodiment shown in the drawings the peculiarities of a crowbar should be described again after the innovation, namely there:

Fig: 1 one of the known hydraulic excavators with a Brecl iron again after the innovation.

Fig. 2-6 shows the various working positions during

the clearing of a stump.

7-9 show the crowbar according to the invention from the side, from above and from the rear.

FIG. 1 shows a hydraulic excavator 1 of known design, at the bearing point 2 of which is a crowbar according to the invention 3 is hinged. Its end 5 opposite the tip 4 of the crowbar is at 6 with the push rod 7 a hydraulic cylinder 8 of the excavator 1 is articulated.

PATENT Attorney DIPL-ING. H. HAMMERMANN, 8500 NUREMBERG, SCHLEGELSTRASSE 25

related to: Date: Page:

DPA. G 69 31 445.0 6.6.70 3

From the position of the hydraulic excavator 1 shown in FIGS. 1 and 2, the crowbar is gradually deflected downwards as shown in FIG. 3, so that its tip comes to lie more and more behind one of the stumps to be cleared. Finally, the tip of the crowbar is pushed laterally into the stump, as FIG. 4 shows. If an upward force K were now exerted on the stumps, as would be necessary when using a rope excavator, this would _{act on the excavator housing with the large lever arm H and} attempt to pivot it counterclockwise around bearing point L. Only the weight E of the excavator on the smaller lever arm h can prevent this. According to FIG. 5, however, during stump clearing with a hydraulic excavator according to the invention, the crowbar rests on the ground at the point of its curvature R and the tensile force Z for lifting or tearing off the stump is replaced by a torque M, which is replaced by \ the forward pushing of the piston rod 7 of the hydraulic cylinder 8 of the excavator 1 comes about. The excavator housing G itself remains practically unencumbered. The excavator can be kept almost as small as desired, as long as its hydraulics are sufficiently effective. Thereupon, the cleared stump can be moved effortlessly according to FIG. 6.

According to FIGS. 7 to 9, the crowbar is connected to a hardened shoe 10 by a barrel pin 9 and held by bolts 11,12 in a bogie 13, the pins 14 and 15 with a fixed bearing point of the

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PATENT Attorney DIPL-ING. H. HAMMERMANN, 8500 NUREMBERG, SCHLEGELSTRASSE 25

to: concerning: date: page:

DPA. G 69 31 445.0 6.6.70 4

Excavator, the journals 16 and 17 of which with the bearing point 6 the piston rod of the hydraulic cylinder are articulated.

Claim to protection;

Claims (1)

ι> ■ PATENT Attorney DIPL-ING, H, HAMMERMANN, 8500 NUREMBERG, SCHLEGELSTRASSE 25 in: concerning: Datain: Seitei DPA. G 69 31 445.0 6.6.70 5 Claim to protection. Crowbar for clearing stumps, characterized in that it is at the working end of a hydraulic excavator (1) is mounted in the middle and its end (5) opposite the crowbar tip (4) with the piston rod (7) of a hydraulic cylinder (8) of the excavator (1) is articulated.