CHISEL ARRANGEMENT FOR EXCAVATOR

Abstract

A chisel arrangement is arranged to be connected to a pivotal tool mount on a work machine. A pivot axis of the tool mount forms an operative pivot axis of the chisel arrangement. The chisel arrangement includes a housing provided with a coupling portion which is arranged to be attachable to the tool mount. A reciprocatable chisel projects from an end portion of the housing. A clearing blade is rigidly attached to the housing remotely from the end portion and projects from the periphery of the housing and is provided with a forward edge which is substantially parallel to the operative pivot axis of the chisel arrangement.

Claims

1.-9. (canceled)

10. A chisel arrangement arranged to be connected to a pivotal tool mount on a work machine, wherein a pivot axis of the tool mount forms an operative pivot axis of the chisel arrangement, and wherein the chisel arrangement comprises: a housing provided with a coupling portion which is arranged to be attachable to the tool mount; and a reciprocatable chisel projecting from an end portion of the housing; wherein a clearing blade is rigidly attached to the housing at a distance from said end portion and projects from the periphery of the housing at an angle to the longitudinal axis of the chisel and is provided with a forward edge which is substantially parallel to the operative pivot axis of the chisel arrangement, the position of the clearing blade relative the housing being unchanged while the chisel arrangement is tilted from a chiseling position to a clearing position, and vice versa.

11. The chisel arrangement according to claim 10, wherein the clearing blade is attached in the immediate vicinity of the coupling portion.

12. The chisel arrangement according to claim 10, wherein the clearing blade is attached to the coupling portion.

13. The chisel arrangement according to claim 10, wherein the forward edge of the clearing blade has a length which is larger than a width of the tool mount.

14. The chisel arrangement according to claim 10, wherein the forward edge of the clearing blade is parallel to the pivot axis of the tool mount.

15. The chisel arrangement according to claim 10, wherein the clearing blade includes a blade plate which is provided with several reinforcing ribs.

16. The chisel arrangement according to claim 10, wherein the clearing blade includes a blade plate, in which reinforcing ribs form side walls on the blade plate.

17. The chisel arrangement according to claim 10, wherein the forward edge is formed of at least one replaceable front piece.

18. The chisel arrangement according to claim 10, wherein the forward edge of the clearing blade has a distance from the housing of 20 cm minimum.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In what follows, examples of preferred embodiments are described, which are visualized in the accompanying drawings, in which:

[0030] FIG. 1 shows a side view of a chisel arrangement attached to an excavator arm and provided with a clearing blade, the chisel arrangement being shown in a first position for chiselling;

[0031] FIG. 2 shows a view corresponding to FIG. 1, the chisel arrangement being shown in a second position for moving loosened material;

[0032] FIG. 3 shows a perspective drawing, on a larger scale, of the clearing blade; and

[0033] FIG. 4 shows a perspective drawing, on a larger scale, of a section of the clearing blade provided with a replaceable front piece.

DETAILED DESCRIPTION OF THE DRAWINGS

[0034] Reference is first made to FIG. 1. A chisel arrangement 1 of a kind known per se includes a housing 11 which, in a first end portion 111, includes a coupling portion 14 arranged for releasable connection to a tool mount 31 on a work machine 3, shown here as an arm on an excavator. A reciprocatable chisel 12 projects from a second end portion 112 of the housing 11. In a manner known per se, the housing 11 accommodates a driving device, not shown, for the chisel 12, typically a hydraulic driving device driven by the hydraulic system (not shown) of the work machine 3. The longitudinal axis 13 of the chisel is perpendicular to the operative pivot axis 15 of the chisel arrangement 1. Said operative pivot axis 15 is formed of a rotational axis 32 of the tool mount 31 relative to the work machine 3.

[0035] A clearing blade 2 is attached to the chisel arrangement 1 at the first end portion 111 of the housing, shown here as attached to the coupling portion 14 by means of blade attachments 23. In an embodiment not shown, the clearing blade 2 may be integrated in the coupling portion 14.

[0036] The clearing blade 2 projects rigidly from the periphery of the housing 11, shown perpendicular to the longitudinal axis 13 of the chisel 12 here. The angle of the clearing blade 2 relative to said longitudinal axis 13 may be adjustable.

[0037] The clearing blade 2 is formed of a blade plate 21 which is provided with a forward edge 211. The blade plate 21 is preferably braced by means of reinforcing ribs 22, shown here as two opposite side walls extending from the forward edge 211 backwards for the entire extent of the blade plate 21. In the embodiment shown, the blade plate 21 extends on both sides along the entire coupling portion 14.

[0038] The clearing blade 2 may have a width that exceeds the width of the housing 11 and the coupling portion 14.

[0039] The clearing blade 2 is shown in more detail in FIG. 3.

[0040] In an alternative embodiment, the blade plate 21 is provided with a replaceable front piece 24 which forms the forward edge 211 of the clearing blade 2, see FIG. 4. The front piece 24 may be a multipart one and may be attached to the blade plate 21 by means of welds or screws or other suitable fastening means.

[0041] When chiselling a surface 4, the chisel arrangement 1 is set with the chisel 12 pointing towards the surface 4, as is shown in FIG. 1. The material 41 is broken loose from the surface, and the loosened material 41 is removed from the surface 4 of the work area by the chisel arrangement 1 being tilted around the pivot axis 15 into the position shown in FIG. 2, as the chisel arrangement 1 is lowered towards the loosened material 41 which is then pushed away by means of the clearing blade 2 as the chisel arrangement 1 and the clearing blade are moved parallel to the surface 4. When the surface 4 at the work area is exposed, the chisel arrangement 1 is re-adjusted to the position shown in FIG. 1, and the chiselling of the surface 4 may continue.

[0042] It should be noted that all the above-mentioned embodiments illustrate the invention, but do not limit it, and persons skilled in the art may construct many alternative embodiments without departing from the scope of the attached claims. In the claims, reference numbers in brackets are not to be regarded as restrictive.

[0043] The use of the verb to comprise and its different forms does not exclude the presence of elements or steps that are not mentioned in the claims. The indefinite article a or an before an element does not exclude the presence of several such elements.

[0044] The fact that some features are indicated in mutually different dependent claims does not indicate that a combination of these features cannot be used with advantage.