Excavating – Scoop or excavating and transporting container
Patent
1996-05-16
1997-12-09
Melius, Terry Lee
Excavating
Scoop or excavating and transporting container
37443, E02F 304
Patent
active
056947100
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hydraulically swung trenching shovel.
Such a trenching shovel has already been disclosed in the patent specification DE 3,245,673 C. In this case swinging of the shovel is caused by a lever, which comprises a coupling rod whose one end is pivoted on the mounting part at a distance from the axis of swing of the shovel and whose other end is pivoted on a sliding shoe running in the carrying member and able to be moved by the piston and cylinder unit. The provision of a sliding shoe of the carrying member in the form of a tube in accordance with the said specification DE 3,245,673 is comparatively expensive. In this case a welded structure must be provided with sliding surfaces, something necessitating high accuracy of manufacture and low tolerances.
One object of the invention is to so further develop a swinging trenching shovel of the type initially mentioned that it has a simpler mechanical design and is consequently simpler and cheaper to produce.
Taking as a starting point a hydraulically swung trenching shovel of the type initially mentioned one first way of achieving this object is such that the coupling rod is directly pivoted on the piston and that at the pivot point of the coupling rod on the piston at least one rotary guide runner is rotatably mounted. As compared with the hydraulically swung trenching shovel of the type initially mentioned the advantages of the invention reside in the substantially improved overall width, the improved transfer of force, since no moments act on the guide means, the improved efficiency, which is achieved by having rolling friction instead of sliding friction, and cheaper manufacture, which is due to the fact that no sliding surfaces are now required for a sliding shoe. Owing to the reduced space requirement optimum distribution of moments is possible and it is generally possible to employ a comparatively large cylinder.
Preferred embodiments of the teaching of the invention are also disclosed. In accordance therewith the piston may be supported at one end in a differential cylinder, while its free end is connected with the coupling rod. In accordance with an alternative design a second cylinder may be provided for the transmission of large moments.
A further design to achieve the above mentioned object resides in that in the case of a hydraulically swung trenching shovel of the type initially mentioned two plunger or ram cylinders are arranged in the carrying member opposite to each other, and into which respectively the ends of a common piston rod plunge. In this case as well the coupling rod is directly pivoted on the piston.
The use of plunger cylinders leads to the advantage that equal forces are produced in both directions. The arrangement of the coupling point on the piston rod may be ensured by the cylinder guide as well and there is a saving because no separate means are required. The use in accordance with the invention of ram cylinders in lieu of differential cylinders is responsible for further economies in manufacture. The ram cylinder only acts in one direction so that in the case of the employment of two ram cylinders there is the economy as regards having a bearing pin. Furthermore the use of ram cylinders offers the advantage that simple exchange of volumes is possible, something which by connection of the lines renders possible a floating position. Such a floating position of the shovel is appropriate and necessary for a variety of different types of work. Moreover when using ram cylinders it is possible to provide for the supply of drive fluid under pressure through suitable holes provided within the piston rod.
Further advantageous developments and convenient forms of the invention will be understood from the following detailed disclosure of embodiments thereof in conjunction with the accompanying drawings.
FIG. 1 shows a lateral view of a trenching shovel.
FIG. 2 shows a partially sectional front view of a trenching shovel in accordance with a first embodiment.
FIG. 2a shows a detailed section taken of the section plane
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Batson Victor
Melius Terry Lee
LandOfFree
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