WO2008139039A1

WO2008139039A1 - Breaking hammer and method of fastening the same

Info

Publication number: WO2008139039A1
Application number: PCT/FI2008/050271
Authority: WO
Inventors: Jukka Mankinen; Ilkka Niemi; Jari Paajanen
Original assignee: Sandvik Mining and Construction Oy
Current assignee: Sandvik Mining and Construction Oy
Priority date: 2007-05-16
Filing date: 2008-05-14
Publication date: 2008-11-20
Anticipated expiration: 2009-11-16
Also published as: FI123633B; WO2008139039A8; FI20075355L; FI20075355A0

Abstract

The invention relates to a breaking hammer and a method of changing the position of the breaking hammer relative to a work machine. The breaking hammer (1 ) is fastened to the boom (3) or the like of the work machine by means of a corresponding fastening piece (7). The mutual position of the breaking hammer and the fastening piece is changeable between at least two alternative positions. Fastening surfaces (16, 18) may be curved.

Description

BREAKING HAMMER AND METHOD OF FASTENING THE SAME

BACKGROUND OF THE INVENTION

[0001] The invention relates to a breaking hammer and a method of fastening it to a work machine. The breaking hammer is provided with a detachable fastening piece by means of which the breaking hammer is fastened to the boom or the like of the work machine. The object of the invention is described in more detail in the preambles of the independent claims of the application.

[0002] A breaking hammer is used as an auxiliary device of an excavator or another work machine when the intention is to break rock, concrete or other relatively hard material. The breaking hammer comprises a percussion device with which impacts can be given to a tool attached to the breaking hammer, the tool further transmitting the impacts to the material to be broken. The percussion device is usually hydraulic and comprises a percussion piston having reciprocal motion due to the effect of hydraulic pressure and striking the impact surface at the upper end of the tool. While impacts are being given with the percussion piston, the tool is pressed against the material to be broken, whereby the tool penetrates, due to the effect of the impact and the pressing, into the material to be broken and causes breaking of the material. The breaking hammer is provided with fastening means by means of which it can be attached to the boom of the work machine. The fastening means typically comprises a fastening piece, which is a part detachable from the basic construction of the breaking device. In general, the fastening piece is attached with a bolt joint to the frame of the breaking hammer, to a protective casing surrounding the frame or to the longitudinal side plates of the breaking hammer. A disadvantage of the present breaking hammers is that they are difficult to set, relative to the boom of the work machine, in the position required by the use in each particular case. This disadvantage makes breaking hammers more difficult to use.

BRIEF DESCRIPTION OF THE INVENTION

[0003] An object of this invention is to provide a novel and an improved breaking hammer and a fastening method for it.

[0004] The breaking hammer according to the invention is characterized in that the first fastening surface and the second fastening surface are provided with at least two fastening positions alternative to each other, whereby the mutual position of the breaking hammer and the fastening piece is changeable.

[0005] The method according to the invention is characterized by positioning the breaking hammer and the fastening piece relative to each other from a first position into at least one second, selectable position and by fastening them subsequently immovably relative to each other.

[0006] An idea of the invention is that the breaking hammer comprises a first fastening surface to which a second fastening surface in the fastening piece can be arranged. Further, the first fastening surface and the second fastening surface are provided with at least two fastening positions alternative to each other, whereby the mutual position of the fastening piece and the breaking hammer is changeable. After adjustment, the fastening piece and the breaking hammer can be locked immovably relative to each other. The fastening piece further comprises one or more fastening members for fastening the boom or the like of the work machine.

[0007] An advantage of the invention is that the new fastening system allows the breaking hammer to be easily positioned, relative to the boom or the like of the work machine, in a desired position for use, transport, maintenance or another need. This is particularly advantageous when the work machine is not provided with a turning device with which the breaking hammer could be turned. If the work machine comprises a turning device, the position of the breaking hammer can be set roughly by means of the adjustment according to the invention, and the fine adjustment of the position can be carried out by means of the turning device between the boom and the fastening piece.

[0008] The idea of an embodiment is that the first fastening surface is at the upper end of the breaking hammer.

[0009] The idea of an embodiment is that the first fastening surface is on the side of the breaking hammer, preferably above the longitudinal middle point of the breaking hammer.

[0010] The idea of an embodiment is that the first fastening surface covers the upper end of the breaking hammer and at least part of the upper part of one side surface.

[0011] The idea of an embodiment is that the first fastening surface and the second fastening surface are curved. The fastening surfaces may have the shape of a circular arch. Further, the curved fastening surfaces may have different lengths, whereby the curved fastening surface with a shorter length can be positioned at different points of the longer curved fastening surface. The curved fastening surfaces may become positioned against each other and transmit forces between components fastened together. Alternatively, the curved fastening surfaces may consist of fastening openings via which there goes a curved line and through which fastening bolts or pins are arranged.

[0012] The idea of an embodiment is that at least the first fastening surface is curved and has at least two radii of curvature, i.e. seen from the longitudinal direction, it has a variable curvature. Thus, the fastening piece can be fastened at such a point on the first fastening surface where a desired mutual position of the breaking hammer and the fastening piece can be achieved owing to the curvature at this point.

[0013] The idea of an embodiment is that the upper end of the breaking hammer is an angular first fastening surface with two or more fastening points arranged at an angular position relative to each other.

[0014] The idea of an embodiment is that the fastening surfaces are peripheral surfaces. Between the protective casing, the side plate or the base frame of the breaking hammer and the fastening piece, there may be an articulation comprising fastening surfaces of a peripheral shape which allow the position of the breaking hammer to be adjusted in a versatile manner.

[0015] The idea of an embodiment is that the fastening surfaces are locked by means of at least one fastening bolt immovably relative to each other. Fastening based on fastening bolts is durable and simple to produce.

[0016] The idea of an embodiment is that in connection with the fastening surfaces there is at least one elongated adjustment opening, through which a fastening bolt is arrangeable. When the fastening bolt has been loosened, the fastening surfaces can be moved relative to each other without removing the fastening piece completely from the breaking hammer. Locking can further be guaranteed with one or more fastening bolts arranged through the fastening openings.

[0017] The idea of an embodiment is that the fastening surface of the breaking hammer and the fastening surface of the fastening piece are provided with shape locking members. One fastening surface may be provided with several grooves, for example, and one fastening surface may be provided with one or more protrusions fitting into the grooves. Further, the fastening arrangement comprises means for arranging the shape locking members against each other in the locking position and, on the other hand, means for affecting the mutual position of the shape locking members in such a way that the fastening surfaces can be positioned in an alternative position relative to each other and subsequently relocked immovably relative to each other. Owing to the shape locking members, it is fast and simple to adjust the position of the breaking hammer. Further, the shape locking members can be dimensioned in such a way that the fastening bolts or the like guaranteeing the shape locking are not subjected to great forces due to the use of the breaking hammer.

[0018] The idea of an embodiment is that the fastening arrangement comprises locking members whose locking effect is based on friction. The locking members may have conical surfaces which are, when being locked, pressed against each other by means of appropriate force members. Such locking is relatively easy to produce, and it is operationally durable.

[0019] The idea of an embodiment is that the position between the fastening piece and the base frame of the breaking hammer can be changed steplessly at least in one direction of movement. Stepless adjustment enables the breaking hammer to be positioned accurately in the position desired by the operator. Stepless adjustment can be locked for instance by means of locking based on conical surfaces.

[0020] The idea of an embodiment is that the position between the fastening piece and the base frame of the breaking hammer can be changed in at least two directions of movement. This application enables versatile adjustment. In some cases, one of the following may be ball-like and one cup- like: fastening surface of the base frame of the breaking hammer and the fastening surface of the fastening piece. Thus, moving relative to several axes may take place simultaneously, and the moving may be stepless.

[0021] The idea of an embodiment is that the fastening piece of the breaking hammer has at least two alternative fastening means, with which the breaking hammer can be fastened to a work machine. The fastening means has at least one fastening flange or the like plane surface, against which a flange on the boom or the like of the work machine can be arranged. This is flange fastening between the breaking hammer and the work machine. Further, the fastening means has at least one opening which may be provided with a coupling pin fastening the breaking hammer to the boom or the like of the work machine. This is called pin fastening. The fastening piece is thus provided with alternative means for at least flange and pin fastening. Thus, the breaking hammer may be, if required, fastened to work machines provided with various fastening systems, whereby the breaking hammer can be exploited more flexibly and efficiently than before.

[0022] The idea of an embodiment is that the fastening piece of the breaking hammer comprises: at least one first protrusion and at least one second protrusion arranged at a distance from each other, whereby there is a substantially empty space between the first protrusion and the second protrusion; at least one set of plane surfaces in the outer part of the protrusions, the plane surfaces forming means for flange fastening between the fastening piece and the work machine; and at least one transverse first opening in the first protrusion and the second protrusion, whereby a coupling pin is arrangeable through the openings for flange fastening between the fastening piece and the work machine.

[0023] The idea of an embodiment is that the first fastening surface and the second fastening surface are locked immovably relative to each other by means of an actuator. The actuator may be hydraulic, for instance. The actuator may be arranged to generate the required frictional forces between the fastening surfaces, or it may be arranged to move suitable locking members, with which movement between the fastening surfaces is prevented during the use of the breaking hammer.

[0024] The idea of an embodiment is that the breaking hammer comprises at least one actuator for changing the mutual position of the breaking hammer and the fastening piece between alternative positions. Such an actuator facilitates adjustment of the position particularly when the breaking hammer is large in size.

BRIEF DESCRIPTION OF THE FIGURES

[0025] Some embodiments of the invention will be explained in greater detail in the attached drawings, in which

Figure 1 shows schematically a side view of a breaking hammer arranged on the boom of an excavator;

Figure 2 shows schematically a side view of the basic construction of a breaking hammer without a fastening piece; Figure 3 shows schematically a perspective view of the breaking hammer of Figure 2 when provided with a fastening piece suitable for flange fastening;

Figures 4 and 5 show schematically a side view of different positions between the protective casing and the fastening piece of the breaking hammer according to the invention;

Figure 6 shows schematically a side view of a breaking hammer provided with a fastening piece suitable for pin fastening;

Figure 7 shows schematically a side view of a fastening piece provided with two alternative fastening arrangements, in other words there are means for flange fastening and means for pin fastening;

Figure 8a shows schematically a side view of the upper end of a breaking hammer and a first fastening surface in it, having several different curvatures;

Figure 8b shows schematically a side view of the angular upper end of a breaking hammer and planar fastening points in it;

Figure 9 shows schematically a side view of an alternative fastening arrangement between the basic construction and the fastening piece of a breaking hammer;

Figure 10 shows schematically a side view of a fastening arrangement between the basic construction and the fastening piece of a breaking hammer, comprising shape locking members;

Figures 11 and 12 show schematically a side view of a fastening arrangement between the breaking hammer and the fastening piece, comprising ball-like fastening surfaces;

Figure 13 shows schematically a side view of yet another fastening arrangement;

Figure 14 shows schematically a perspective view of the fastening arrangement according to Figure 13, seen from the opposite side;

Figures 15 and 16 show a cut-open view of some details of the locking between the fastening piece and the protective casing;

Figure 17 shows schematically a side view of a breaking hammer whose sides are provided with ball-like fastening surfaces to which the cup-like fastening surfaces of the fastening piece of the breaking hammer are arranged; and Figures 18 to 22 show schematically a side view of the breaking hammer according to Figure 17, positioned in different positions relative to the fastening piece.

[0026] In the figures, some embodiments of the invention are shown simplified for the sake of clarity. Similar parts are denoted in the figures with the same reference numerals.

DETAILED DESCRIPTION OF SOME EMBODIMENTS OF THE INVENTION

[0027] In Figure 1 , the breaking hammer 1 is arranged at the free end of a boom 3 of a work machine 2, such as an excavator. The breaking hammer 1 may be arranged in any movable work machine 2 or, for instance, on a boom mounted on a fixed base. The breaking hammer 1 comprises a percussion device 4 with which impact pulses can be generated. The breaking hammer 1 is pressed by means of the boom 3 against material 5 to be broken at the same time as impacts are given by the percussion device 4 to a tool 6 connected to the breaking hammer 1 , the tool transmitting the impacts to the material 5 to be broken. The percussion device 4 may be hydraulic, whereby it may be connected to the hydraulic system of the work machine 2. On the other hand, the percussion device 4 may be of another type, for example electric. Further, the impact pulses may be generated by means of an impact element moved in the percussion device 4 in a reciprocating manner, or in any other way.

[0028] The basic construction of the breaking hammer 1 is provided with a fastening piece 7, by means of which the breaking hammer 1 can be fastened to the outermost end of the boom 3. The fastening piece 7 may be arranged in the upper part of the breaking hammer 1 , on its side surface 8, as in Figure 1 , or at its upper end 9, as in Figure 3, for example. The fastening piece 7 is a separate detachable piece that may be fastened to the basic construction of the breaking hammer 1 , in other words to the protective casing surrounding the breaking hammer 1 , to the protective side plates arranged against the side surfaces of the breaking hammer, or directly to the frame of the breaking hammer if the breaking hammer does not comprise any protective casing or side plates at all. The fastening piece 7 comprises fastening surfaces and fastening members by means of which it can be fastened to the boom 3. Further, the boom 3 may comprise a turning device 10, by means of which the fastening piece 7 and the breaking hammer 1 fastened to it can be turned relative to the end of the boom 3 in direction A. The turning device 10 may be, for example, a hydraulic cylinder or the like actuator which may be connected to the fastening piece 7 by means of a turning pin 11 or the like. Further, the outermost end of the boom 3 may be connected to the fastening piece 7 by means of a coupling pin 12, for example. The coupling pin 12 may function as an articulation around which the breaking hammer 1 can be turned.

[0029] The breaking hammer 1 shown in Figure 2 is an elongated piece which comprises an upper end 13 and a lower end 14, i.e. the end on the side of the tool 6. The breaking hammer 1 can be fastened to the boom 3 or the like over the portion of the upper end 13 by means of the fastening piece 7 not shown in Figure 2. In order to fasten the fastening piece 7, the upper end 13 of a protective casing 15 of the breaking hammer 1 may be shaped as a first fastening surface 16 of the shape of a circular arch, to which a second fastening surface, which is shaped in a corresponding manner, can be fastened. The first fastening surface 16 may be further provided with several first fastening openings 17. The number and fastening openings 17 and their position may be selected, when needed, in the same way as the radius of curvature R.

[0030] In Figure 3, the fastening piece 7 is fastened to the upper part of the protective casing 15. The fastening piece has a second fastening surface 18 that may be of a curved shape similar to the first fastening surface

16 in the protective casing 15. Further, the second fastening surface 18 has two or more second fastening openings 19. The fastening openings 19 of the fastening piece can be arranged aligned with the desired fastening openings

17 of the protective casing 15, after which fastening pins 20 or fastening bolts can be arranged through the openings 17, 19, which pins or bolts connect the fastening piece 7 and the breaking hammer 1 to each other. The number of fastening openings 17 may be greater in the first fastening surface 16 than the number of fastening openings 19 in the second fastening surface 18, or alternatively the situation may be opposite. In such a case, the fastening piece 7 may be fastened in a desired position relative to the breaking hammer 1. In Figure 3, the fastening piece 7 is arranged in such a way that a fastening flange 21 is perpendicular to the longitudinal axis of the breaking hammer, in other words the boom becomes fastened in the longitudinal direction of the breaking hammer. The fastening piece 7 is provided with a fastening flange 21 when flange fastening is applied between the boom 3 and the fastening piece 7. Further, the fastening flange 7 may comprise, on the side of the lower surface of the fastening flange 21 , a first bracket 22a and a second bracket 22b, which are arranged at a distance from each other in such a way that the upper end of the protective casing 15 can be arranged between the brackets 22. The outermost ends of the brackets 22 may be provided with a second fastening surface 19. Alternatively, the brackets 22 may extend farther from the upper end of the breaking hammer, whereby no fastening surfaces have been formed at their outermost ends but in this case the fastening surface is formed by a line passing via the openings 19 in the fastening piece 7.

[0031] It is seen from Figures 4 and 5 that the position of the fastening piece 7 relative to the protective casing 15 can be selected as desired. This feature is enabled in this application by the shaping of the fastening surfaces 16 and 18 and by there being several alternative fastening openings 17, 19 arranged for the fastening. The fastening piece 7 can be arranged at a desired angle B relative to the protective casing 15.

[0032] Figure 6 shows the breaking hammer 1 provided with a fastening piece 7 applicable to pin fastening. The fastening piece 7 comprises brackets 22 at a distance from each other in such a way that between the brackets 22 there remains an empty space in which the end of the boom 3 is arrangeable. The brackets 22 comprise, for pin fastening, openings 23 through which the pins engaging the fastening piece and the boom can be arranged. The fastening piece 7 provided with pin fastening can be positioned in a desired position relative to the protective casing 15.

[0033] Figure 7 shows a breaking hammer 1 provided with a fastening piece 7 applicable to both pin and flange fastening. The fastening piece 7 comprises two brackets 22 at a distance from each other and there remains an empty space between the brackets. The brackets 22 are provided with openings 23 for pin fastening, and further, there are flanges 21 for flange fastening at the outermost end of both brackets 22. A breaking hammer provided with a fastening piece like this is suitable for use in work machines with different fastening systems. Also this fastening piece 7 can be positioned in a desired position relative to the protective casing 15.

[0034] Figure 8a illustrates, in a very simplified manner, that the first fastening surface 16 in the protective casing 15, in a side plate or in the frame of an breaking hammer may have, instead of one radius of curvature, several radii of curvature. Points having different curvatures offer more options to affect the position of the breaking hammer. For the sake of clarity, Figure 8a indicates only two radii of curvature R1 and R2.

[0035] Figure 8b illustrates, in a very simplified manner, that the protective casing 15, the side plates or the frame of the breaking hammer may have an angular upper end. Thus, the first fastening surface 16 may comprise two or more fastening points 16a to 16e. At least part of the fastening points may be provided in such a way that there are two or more alternative fastening options in its portion as well. In the solution according to the figure, 16a and 16e are provided with extra fastening openings 17.

[0036] Figure 9 shows a fastening piece 7 whose brackets 22 have elongated adjustment openings 24 as well as a plurality of fastening openings 19 arranged on a curved line 25. Correspondingly, the protective casing 15 or the like basic construction of the breaking hammer 1 comprises a plurality of fastening openings 17 arranged on a corresponding curved line 25. In this case, the fastening openings and the curved line 25 passing via them may form a first fastening surface and a second fastening surface. The position of the fastening piece 7 may be changed after the first fastening bolt 20a has been removed and the second fastening bolt 20b in the adjustment opening 24 has been loosened. Thus, the second fastening bolt 20b keeps the fastening piece 7 and the protective casing 15 engaged with each other but still allows their mutual position to be adjusted in direction B. Adjusting may be carried out for example by moving the boom after the bolt 20a has been detached and the bolt 20b loosened. Adjusting is performed in such a way that one of the fastening openings 19 is positioned aligned with the fastening openings 17. This is not stepless adjustment. In order to reduce adjustment steps, there may be fastening openings 17, 19 arranged at different distances from each other on the line 25, in which case the user has more options to arrange the fastening openings at their proper points to engage the fastening bolt 20a. The fastening bolt 20a guarantees that the fastening does not rely merely on the frictional forces generated by the fastening bolt 20b.

[0037] Figure 10 shows an application where the fastening surfaces are provided with shape locking members 26, such as tooth systems, protrusions and grooves or corresponding members matching with each other. For the sake of clarity, the figures show only part of some shape locking members. Further, fastening surfaces are illustrated with curves 27 and 28. Pulled apart in direction C, the shape locking members 26 can then be positioned in a new position in direction B relative to each other and finally pushed against each other again in direction C to lock their mutual position. The shape locking members 26 thus have a locking position, in which they are bonded to each other, as well as an adjustment position, in which they are apart from each other. For the purpose of moving and locking in direction C, the fastening piece 7 may comprise a locking member 29 with an elongated opening 30, through which the fastening bolt 20 fastened to the protective casing 15 can be arranged and tightened. After the fastening bolt 20 has been loosened, the fastening piece 7 and the protective casing 15 can be pulled apart in direction C to the extent of the distance allowed by the elongated opening 30. Subsequently, adjusting can be carried out in direction B, and the shape locking members 26 can be pushed back to their proper places to lock the desired position. Finally, the fastening bolt 20 is tightened, the bolt keeping, in direction C, the fastening piece 7 and the protective casing 15 immovable relative to each other. For the duration of the use, the fastening piece 7 and the protective casing 15 can be locked immovably relative to each other in direction C with yet some other locking bolts or the like members.

[0038] Figure 11 shows a fastening piece 7 provided with a ball-like fastening surface 18. The fastening surface 16 in the protective casing 15, in turn, is cup-like, whereby the fastening surfaces 16, 18 match. Thus, the mutual position of the fastening piece 7 and the protective casing 15 can be adjusted simultaneously relative to two axes of movement in directions B and D, whereby the adjustment feasibility is particularly good. After the adjustment, locking can be carried out with an appropriate mechanical, hydraulic or electrical mechanism, utilizing shape locking, friction, conical surfaces or the like. Figures 11 and 12 show one locking arrangement, in which a locking piece 31 provided with a conical or curved surface can be pressed by means of an appropriate force member, such as a screw 32, against the locking surface 33. Thus, frictional force is generated between the locking piece 31 and the locking surface 33. This locking enables stepless adjustment.

[0039] The breaking hammer 1 shown in Figure 13 comprises an articulation 34 allowing the protective casing 15 and the fastening piece 7 to be turned relative to each other in a desired position in direction B. In connection with the articulation 34, there are locking members enabling stepless locking into a desired position. [0040] Figure 14 shows that the protective casing 15 may be formed of halves 15a of a protective casing, which halves may both be provided with halves 7a of a fastening piece. Between the half 15a of the protective casing and the half 7a of the fastening piece, there is an articulation mechanism 34a. Figure 14 further shows a part of a feasible locking mechanism, which may comprise locking bolts 35 or the like force members as well as a locking flange 36.

[0041] Figure 15 shows a cut-open fastening arrangement, and Figure 16 further shows an enlargement of point G. The protective casing 15 may be provided with a housing 37 having a first fastening surface 16 on the side of the outer surface and, further, a locking surface 38 on the side of the inner surface. The fastening piece 7 may have a protrusion 39, on the outer periphery of which there is a second fastening surface 18. In this application, the first fastening surface 16 and the second fastening surface 18 may be peripheral surfaces or they may be formed of two or more peripheral parts. Further, the fastening surfaces 16, 18 may comprise first conical surfaces 40 arranged against each other. A locking surface 41 in the locking flange 36 and a locking surface 38 formed in the housing 37 may form second conical surfaces 42 to be arranged against each other. By means of the locking bolts 35, pressing force H is generated by means of which the first conical surfaces 40 can be pressed against each other and, correspondingly, the second conical surfaces 42 can be pressed against each other, which generates the frictional force required in the locking. In some cases, it is sufficient to have only one set of conical surfaces 40, 42. Further, instead of locking bolts 35, another force member, such as an eccentric member, a wedge or an actuator, may be used to generated the required pressing force. Further still, it may be possible to provide the surfaces that become positioned against each other with shape locking members, such as tooth systems, instead of conical surfaces. In some cases, it may be sufficient that only one side of the protective casing 15 be fastened to the fastening piece 7 by means of one articulation 34. Further, it is possible to arrange the articulation 34 in the side plate or directly in the base frame of the breaking hammer 1 instead of the side surface of the protective casing 15.

[0042] Figure 17 shows a breaking hammer whose side surfaces are provided with ball-like first fastening surfaces 16. The fastening surfaces 16 may be formed on the side surface of the protective casing 15, on the side plates or in the frame. Further, in connection with the fastening piece 7, there are cup-like second fastening surfaces 18, which match with the first fastening surfaces 16. Alternatively, the first fastening surface may be cup-like and the second fastening surface may be ball-like. The fastening surfaces 16, 18 provided with ball surfaces allow the breaking hammer and the fastening piece to be positioned in a versatile manner in different positions relative to each other, as can be seen from Figures 18 to 22. The fastening surfaces provided with ball surfaces enable simultaneous moving in directions B and D, similarly to the application in Figures 11 and 12. The fastening piece 7 comprises branches 22a, 22b, which may be shaped and dimensioned in such a way that there remains some free space 50 between the branches, enabling versatile moving in the directions shown in Figures 18 and 19. For the sake of clarity, Figures 17 to 22 do not show locking members for locking the mutual position of the breaking hammer and the fastening piece. However, any solution presented in this application or some other locking suitable for the purpose may be used as locking members. It is further to be noted that, for the sake of clarity, Figures 17 to 22 are presented in a very simplified manner.

[0043] It is also feasible to apply different combinations of the solutions described in this application to fasten the breaking hammer 1. It is further to be noted that the breaking hammer 1 can be fastened to any protrusion, fastening part or fastening surface of a work machine instead of the boom 3.

[0044] In some cases, features presented in this application can be used as such, irrespective of other features. On the other hand, features presented in this application can, if required, be combined to form various combinations.

[0045] The drawings and the related description are only intended to illustrate the idea of the invention. Details of the invention may vary within the scope of the claims.

Claims

1. A breaking hammer, comprising: a percussion device (4) arranged to generate impact pulses in a tool (6) to be connected to a breaking hammer (1); and at least one first fastening surface (16); a fastening piece (7) having a second fastening surface (18) arranged to match with said first fastening surface and locked immovably relative to the first fastening surface (16); and at least one set of fastening members (21 , 23) in the fastening piece (7), by means of which members the breaking hammer (1) is fastenable to a work machine (2), characterized in that the first fastening surface (16) and the second fastening surface (18) are provided with at least two fastening positions alternative to each other, whereby the mutual position of the breaking hammer (1) and the fastening piece (7) is changeable.

2. A breaking hammer according to claim ^characterized in that the breaking hammer (1) is an elongated piece comprising an upper part (13) and a lower part (14); and that the first fastening surface (16) is at the upper end (9) of the breaking hammer (1).

3. A breaking hammer according to claim ^characterized in that the first fastening surface (16) is on the side surface (8) of the breaking hammer (1 ).

4. A breaking hammer according to any one of the preceding claims, characterized in that the first and the second fastening surface (16, 18) are of a curved shape and match with each other.

5. A breaking hammer according to any one of the preceding claims, characterized in that there are first openings (17) in connection with the first fastening surface (16); there are second openings (19) in connection with the second fastening surface (18); at least two first openings (17) and at least two second openings (19) are arranged aligned, and fastening bolts (20) are arranged through the openings; and the number of first openings (17) and second openings (19) is different, whereby there are extra openings and alternative fastening points between the fastening surfaces (17, 19).

6. A breaking hammer according to any one of preceding claims 1 to 4, characterized in that there are shape locking members between the first fastening surface (16) and the second fastening surface (18) to prevent them from moving relative to each other at least in one direction of movement.

7. A breaking hammer according to any one of preceding claims 1 to 4, characterized in that out of the first fastening surface (16) and the second fastening surface (18), one is substantially ball-like and one is substantially cup-like, whereby the position between the fastening piece (7) and the basic construction of the breaking hammer is simultaneously adjustable in two directions of movement.

8. A breaking hammer according to any one of preceding claims 1 to 4, characterized in that the first fastening surface (16) and the second fastening surface (18) are peripheral surfaces; and the mutual position of the fastening surfaces (16, 18) is arranged, after the adjustment, to be locked by means of conical surfaces that are arranged to be pressed against each other by means of at least one force member.

9. A breaking hammer according to any one of the preceding claims, characterized in that the first fastening surface (16) is formed in one of the following: in a protective casing (15) surrounding the breaking hammer, in a side plate arranged against a side of the breaking hammer; in the frame of the breaking hammer.

10. A breaking hammer according to any one of the preceding claims, characterized in that the fastening piece (7) comprises at least two alternative fastening members (21 , 23) with which it is fastenable to the work machine; the first fastening means comprise a fastening flange (21 ) against which a flange belonging to the work machine (2) is arrangeable to form flange fastening between the breaking hammer (1 ) and the work machine (2); and the second fastening means comprise at least one opening (23) in which a coupling pin (12) is arrangeable to form alternative pin fastening between the breaking hammer (1 ) and the work machine (2).

11. A method of fastening a breaking hammer to a work machine, the breaking hammer comprising: a percussion device (4) arranged to generate impact pulses in a tool (6) to be connected to a breaking hammer (1 ); a fastening piece (7); and at least one set of fastening members (21 , 23) in the fastening piece (7), by means of which members the breaking hammer (1 ) is fastenable to a work machine (2); and the method comprising: fastening the fastening piece (7) immovably in the breaking hammer; and fastening the fastening piece (7) to a work machine; c h a r a c t e r i z e d by positioning the breaking hammer (1 ) and the fastening piece (7) relative to each other from a first position into at least one second, selectable position and by fastening them subsequently immovably relative to each other.