Hand-Operated Apparatus for Clearing Stumps

Abstract

The invention relates to an apparatus for clearing stumps, which uses a slow cutting element (3), which cutting element is guided by great force, however, in order to coarsely machine a root, but can be operated by a single person. According to the invention, this made possible by two suitable cutting elements (3) being guided against each other or a suitable cutting element is guided against a suitable retaining element, such that the applied forces approximately cancel each other out. The cutting elements (3) are located at a front end of two plier jaws (1), which are guided against each other by a drive element.

Claims

1.-6. (canceled)

7. Apparatus for coarsely machining roots, comprising at least two lever-like plier jaws which can be moved against each other and are connected to each other in an articulated manner, wherein a cutting element is formed on at least one of the plier jaws on the end facing the other plier jaw, wherein both plier jaws can be moved against one another due to the exertion of force of a drive device, wherein the apparatus is hand-operated and designed independently of a work machine or a vehicle, characterized in that the apparatus comprises at least one drive device (4) directly attacking the plier jaws (1), which drive device (4) extends between the two plier jaws (1) transversely to a connecting axis, which, in the case of closed plier jaws (1), runs from one joint (2), thereby connecting the two plier jaws in a swivelling manner, to the ends of the plier jaws (1) comprising a cutting element (3).

8. Apparatus according to claim 1, characterized in that the drive device (4) is a preferably dual-action hydraulic cylinder.

9. Apparatus according to claim 1, characterized in that at least one cutting element (3) comprises at least two cutting edges on the cutting end of one of the plier jaws (1), which cutting edges are arranged at an angle of 45° to 135° to one another, preferably being arranged at an angle of 60° to 120° to one another, wherein the cutting element is preferably approximately L-shaped.

10. Apparatus according to claim 1, characterized in that at least one of the cutting edges of one of the approximately plate-shaped cutting elements (3) is attached to the plier jaw (1) in such a way that it forms a 0° bis 30° free angle α, preferably a 5° to 15° free angle.

11. Apparatus according to claim 1, characterized in that a cutting element (3) is respectively formed on the cutting end of each plier jaw (1), wherein, preferably, both cutting elements are identically shaped and are arranged in a mirror-symmetrical manner with relation to a level that extends through the connecting axis.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The figures show:

[0019] FIG. 1 is a schematically simplified view of an apparatus according to the invention with closed plier jaws;

[0020] FIG. 2 a corresponding view of the apparatus in FIG. 1 with open plier jaws;

[0021] FIG. 3 a view in which one looks at one of the plier jaws in the axis direction of the drive device (hydraulic cylinder) and recognizes the approximately L-shaped cutting element with the two cutting edges at an angle to each other.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The exemplary cutting element shown in FIGS. 1 to 3 comprises a plier-like apparatus (FIG. 1) with two plier jaws (1), which each have a suitable cutting element (3) on their respective working ends, which are located opposite to a joint (2). Between the working end and the joint, there lies a suitable drive element (4), which can move the two jaws against each other with suitable force (FIG. 2). Expediently, there are 2 handles (5) with operating elements near the joint to facilitate handling.

[0023] The drive element is expediently implemented as a double-action hydraulic cylinder, which is connected to the jaws via joints (6). The hydraulic cylinder expediently has an inner diameter between 70 and 120 mm with a piston rod between 30 and 70 mm and is pressurized with 150 to 400 bar via an external hydraulic unit. The return of the hydraulic cylinder is preferably switched via a rapid-speed valve. The cylinder and aggregate are preferably connected by means of commercially available plug couplings.

[0024] The cutting elements are preferably L-shaped with cutting edges facing each other (FIG. 3) to ensure complete separation of the section of wood, which prevents the cutting elements from attaching themselves to the wood. For the same reason, the cutting elements are expediently designed in such a way that the cutting edges are simultaneously in contact with each other across their entire length. In order to minimize wear, the cutting elements are preferably made of a highly wear-resistant steel (e.g., Hardox 500) and provided with a ball-ground cutting edge with a 25-30° cutting angle.

[0025] In order to facilitate penetration into the wood, it is favourable if the cutting element is attached to the jaw in such a way that the plate that forms the horizontal part of the L deviates from the 0-degree position relative to the tangent of the circular arc that the jaw describes by about 10° outwards in such a way that a 10° free angle (α) is formed (see FIG. 1).