the solution of this task is that the pusher drive for the deburring motion of the work piece or the pusher drive moving the carriage of the deburrer form a unit with the deburrer or with the carriage of the deburrer respectively , which realize two functions : shifting and deburring ; travelling and deburring = pusher drive deburrer . as occasionally billets and slabs with top side lying cutting burr have to be cleaned of the latter , these pusher drive deburrers can as well be applied advantageously as hanging units . as shown in fig1 the pusher bar ( 6 ) sitting on the axle stubs ( 7 ) of the deburrer body ( 3 ), driving the slab ( 1 ) with its burr ( 2 ) over the deburrer body ( 3 ) with its compressed air actuated deburrer pistons ( 4 ) and their deburrer chisels ( 5 ), whereby the action and reaction forces of the deburring balance themselves near their location of origin , when the pusher bar ( 6 ) driven by a not shown motor via shaft ( 8 ) with a gear ( 9 )— both supported in frame ( 10 ) and engaged in the geared lower part of the pusher lever ( 11 )— moves the slab ( 1 ) across the deburrer chisel in accordance with fig2 a and 2b , the pusher bar ( 6 ) can be elongated by so named pusher plates ( 12 ), which increase the length of the pusher bar ( 6 ) if the supporting rollers ( 13 ) are arranged near to the deburrer because of the shortness of slabs . then it is possible to contact the slab ( 1 ) further up on its front face , even partly above it , to avoid a lifting of a short slab ( 1 ) by a force component at the pusher bar ( 6 ) moving in an arc . for this the pusher plates ( 12 ) have to be shaped regressing inclined and the neighbouring support rollers ( 13 ) must be designed as disk rollers , into which the pusher plates ( 12 ) will reach . in fig3 a - 3 f it is shown that it is advantageous to operate the deburrer body ( 3 ) of the deburrer and its pusher bar ( 6 ) in related steps one after another from and into certain positions using a common drive and eventually an additional clutch . fig3 a shows the slab ( 1 ) with its first burr ( 2 ) in run - out direction above the deburrer in o - position . pusher bar ( 6 ) and deburrer body ( 3 ) with the deburrer chisels ( 5 ) are rotated away with the run - out direction by the angles α plus β respectively β . the common drive moves the pusher bar ( 6 ) and the piston body ( 3 ) to the left by an angle β , whereby the pusher bar ( 6 ) arrives in a position angle α in front of the slab , and the deburrer body under the slab ( 1 ). now the deburrer chisel ( 5 ) is lifted up against the slab ( 1 ) right behind the burr ( 2 ). the situation shown in fig3 b = starting position is reached . from this the pusher bar ( 6 ) pushes the slab ( 1 ) across the deburrer chisels ( 5 ) with its stationary deburrer body ( 3 ) and thus pushing the burr ( 2 ) off , moving into the situation depected in fig3 c . the pusher bar ( 6 ) travels now again together with the deburrer body ( 3 ) into the second o - position ( fig3 d ) for the second burr ( 2 ), the deburrer chisel ( 5 ) is during this retracted . then the slab ( 1 ) travels forward in run - out direction into its second burr ( 2 ) according to situation the situation depicted in fig3 e into its deburring position corresponding to the o - position situation depicted in fig3 a . after the pusher bar ( 6 ) and the deburrer body ( 3 ) have rotated into starting position and the deburrer chisels are lifted , the second burr ( 2 ) can be removed as before . after the complete deburring the slab will be run - out . an especially advantageous design of the pusher drive deburrer is shown in fig1 . here the agent compressed air required for pushing the deburring deburrer ( 4 ) with deburrer chisel ( 5 ) out is as well used for fixing the piston body ( 3 ). described in detail , the deburrer body ( 3 ) has two axle stubs ( 7 ), supported in bearings in an inner frame ( 10 a ), carrying then the bar lever ( 11 ) of the pusher bar ( 6 ) and having a multi key profil for a shiftable cam disk ( 14 ) equipped with cams ( 15 ). in the interior of the axle stubs ( 7 ) which serve as cylinders in a piston ( 16 ), which shifts and fixes the cam disk ( 14 ) with its cams ( 15 ) into the corresponding ones of the pusher lever ( 11 ) using a spring ( 18 ) in a spring sleeve ( 17 ) via a nut ( 19 ), so that it can rotate the deburrer body ( 3 ) via gear ( 9 ) and shaft ( 8 ), which is also supported in the inner frame ( 10 a ). when compressed air is flowing into the deburrer pistons ( 3 ) to lift the deburrer body ( 4 ), then the piston ( 16 ) moves with its step on the piston rod ( 26 ) the cam disk ( 14 ) with its cams ( 15 ) into the accordingly drilled outer frame ( 10 b ) and fixes the deburrer body ( 3 ) in this position as well if the pusher bar ( 6 ) continues to rotate . when the compressed air is flowing out not only the deburrer pistons ( 4 ) with the deburrer chisels drop , but the deburrer ( 16 ) will be pushed back by the spring ( 17 ) and disengages the piston body ( 3 ) from the outer frame ( 10 b ) and at the same time connected with the pusher bar ( 6 ) for further rotation . thus the necessary synchronous rotations , the fixing , the on - ward rotation and the common on - rotation with the corresponding pushing - in and out of the cam disk ( 14 ) to and from the pusher bar ( 6 ) and deburrer body ( 3 ) to and in the equivalent situations are safely possible with a minimum of cost . with soft and tough , additionally warm cutting beards ( 2 ) it happens , that separated narrow strips of this beards ( 2 ) intrude into wedge - like openings between the adjacent surfaces ( 31 ) of the deburrer chisels ( 5 ) at higher deburring speeds and jam there and prevent a safe contact of the latter to the slab ( 1 ) surface during the next deburring process and prevent a proper deburring in the area of this two deburrer chisels ( 5 ). a deburring chisel ( 5 ) as shown in fig4 a - 4 c has recessed steps behind its cutting edges ( 32 ) at its adjacent faces ( 31 ) of different lengths , but at least as long in longitudinal direction of the slab as the burr ( 2 ) to be eliminated . these recesses are called chip grooves ( 20 ) and widen when going inside the deburrer chisel at least to an angle γ , which develops by opposition rotation of neighbouring chisels ( 5 ). in vertical direction the chip grooves ( 20 ) should be inclined against the adjacent faces ( 31 ) in order to avoid that an intruding piece of burr ( 2 ) does not only not jam , but also falls possibly out when the neighbouring deburrer chisels lift and lower not synchronously . even more advantageous appear to be the shapes of the deburrer chisels ( 5 ) shown in fig5 a - 5 c , where a little piece of the one cutting edge ( 32 ) of the one deburrer chisel ( 5 ) overlapps the cutting edge ( 32 ) of the neighbouring deburrer chisel ( 5 ), i . e . one working in front of the other . in this way a unwanted wedge - shaped gap between two deburrer chisels ( 5 ) cannot develop . this shapes can ce produced and used as periodically arranged t - or as continuously arranged z - design . in fig6 a pusher drive deburrer as described before is suggested , which can deburr extremely short slabs , because before and after it supporting rolls ( 13 ) with disks are positioned and the deburrer body ( 3 ) has on its sides roller bearing support rollers ( 21 ) which are on top in the o - positions or final positions of the deburrer body ( 3 ) and avoid a down - tilting of the short slabs ( 1 ) travelling over them . otherwise these support rollers ( 21 ) hide in the gaps between the disks of the main support rollers ( 13 ). the different situations depicted in fig3 a - 3 e of the working procedure during deburring and the respective angle positions for control of interlocking and lock releasing may be controlled . when deburring the first , that means the front cutting beard ( 2 ) in travel direction the same positions are considered but in inverse direction . that means that the two parts between 270 and 330 as well as between 30 and 90 ° related to the pusher bar ( 6 ) are linked , once with the deburrer body ( 3 ) at 30 ° before and once behind . between them the deburrer body ( 3 ) is interlocked with the outer frame ( 10 b ) at 360 °. in fig7 a deburrer whose pusher drive , composed of cylinder ( 22 ), cylinder cover ( 23 ), tension rods ( 24 ) holding together the latter and not visible pistons with piston rod ( 26 ), carries as well a piston body — the one here being realized as unit with a cylinder cover ( 23 )— with the deburrer piston ( 4 ) and the respective deburrer chisel ( 5 ) as it travels with travelling wheels ( 25 ) in tracks ( 28 ). thereby the travelling wheels ( 25 ) can be supported in the cylinder covers ( 23 ). in order to achieve a best possible use of the available gap between the support rollers ( 13 ) the piston head ( 29 ) is linked below these support rollers ( 13 ) for the billet ( 1 ). as shown in fig8 a and 8b a such composed deburrer can be lowered in downward bent tracks ( 28 ) or such with lowering cylinders ( 30 ) outside the deburring procedure in order to increase the operational safety .