fig1 shows a wood processor according to the invention , especially a first illustrative example of the arm system and the unit in a lateral view . the arm system contains an outer beam 10 intended to be attached to a vehicle , for example a wood tractor ( not shown ). the arm system is particularly designed to be utilized as a so - called rotator unit at the power take - off of a usual wood tractor , but can also be used for bigger wood processing machines . movably arranged within this outer beam 10 , as an inner beam 12 which supports , at one of its ends , a delimbing head 13 connected to a felling head 14 in the position shown in fig1 . the felling head is attached to the outer beam 10 . an attachment 15 for a double - armed hinge 16a , 16b is arranged at the outer end of the inner beam 12 , one arm hinge 16a being pivotably connected at one of its ends to the attachment 15 and pivotably connected at its other end to the other arm hinge 16b . the other arm hinge 166 is pivotally attached to an attachment 17 at its other end . the attachment 17 is attached to a slide bar 18 sliding on the outer beam 10 . the double - armed hinge 16a , 16b is operated by a hydraulic cylinder 19 which is also attached to the slide bar 18 . an attachment 20 for a second double - armed hinge 21a , 21b is also attached to the slide bar 18 , one arm hinge 21a being pivotably attached at one of its ends to the attachment 20 and pivotably connected with the other arm hinge 21b at its other end . the arm hinge 21b is pivotably connected at its other end to an attachment 22 attached to the outer beam 10 . this second arm hinge 21a , 21b is operated by a second hydraulic cylinder 23 . although not apparent from the figure , a corresponding second arm hinge and second hydraulic cylinder are attached at the other side of the outer beam 10 and the other side of the slide bar 18 . part of the arm system in fig1 is shown in fig2 viz , the outer portion of the arm system , with the difference from fig1 that the unit consisting of delimbing head 13 and felling head 14 is opened to a substantially vertical position to enable felling of standing wood . as is apparent from this figure , a hydraulic cylinder 24 is attached to the outer beam 10 and to the felling head 14 at its other end to enable turning of the felling head 14 together with the delimbing head 13 about a tilt shaft 25 at the outer end of the inner beam 12 . fig3 is a lateral view of the arm system in a position , in which the inner beam 12 has been moved out of the outer beam 10 and , thus , the delimbing head 13 has been separated from the felling head 14 and is spaced from the felling head 14 . the inner beam 12 has been pushed out , in that the hydraulic cylinder 19 has been activated and pushed out its piston rod , which has caused turning of the arm hinge 16b about its turning point in the attachment 17 and consequently a displacemant of the arm hinge 16a which has enforced extraction of the inner beam out of the outer beam . in fig4 a position is shown , in which the other hydraulic cylinder 23 also has been activated and pushed out its piston rod and compelled , in this way , the arm hinge 21b to pivot about its turning point in the attachment 22 , forcing , in this way , the arm hinge 21a to be moved forwards . however , this arm hinge 21a is attached to an attachment 20 on the slide bar 18 , and , in this way , the slide bar 18 has been forced to be moved forwards along the outer beam 10 and move the inner beam 12 further outwards . an intermediate beam 11 arranged between the inner beam 12 and the outer beam 10 also is pushed out of the outer beam 10 . this intermediate beam 11 has been drawn out of the outer beam 10 , in that it has been carried along by the inner beam 12 when this has reached its furthest pushed - out position relative to the intermediate beam 11 . the intermediate beam 11 can then be arranged to be brought along into the outer beam 10 upon retraction of the inner beam 12 , when the inner beam 12 has reached its most pushed - in position relative to the intermediate beam 11 . fig5 shows the outer end of the inner beam 12 with the attachment 15 of one arm hinge ( 16a ) and with an attachment 26 at its underside to receive the delimbing head and turning thereof about the tilt shaft 25 . as is apparent from fig5 a locking plate 27 is also attached to the underside of the outer beam 12 . the locking plate 27 has a hole 28 for securing the delimbing head to the beam 12 when the beam 12 is pushed out of the outer beam 10 . this is described in greater detail below . fig6 shows a section of the inner beam 12 according to the arrows vi -- vi on fig5 . fig7 is a view corresponding to fig5 but of the end of the outer beam 10 . this end of the outer beam supports a mounting clamp 29 for the felling head ( not shown in this figure ). as is apparent from fig7 the mounting clamp 29 projects in the longitudinal direction of the beam 10 , past the end of the beam , and has a hole 30 for attachment of a pivot pin for the suspension of the felling head . the projection of the mounting clamp 29 past the end of the beam 10 is so adapted that the center of the hole 30 coincides with the center of the attachment 26 of the delimbing head , so that the tilt shaft 25 of the felling head and that of the delimbing head coincide . for illustrative purposes , this mounting clamp 29 has been omitted in fig1 - 4 , because it would otherwise hide other essential parts . in fig8 a section according to the arrows viii -- viii in fig7 is shown , from which it is apparent that the mounting clamp also projects from the side of the outer beam 10 to leave a sufficient space between its two arm ends in order that the delimbing head and the felling head might pass therebetween . fig9 is an end view of the slide bar 18 , from which it is apparent that the slide bar comprises a supporting surface which is inwardly flanged at its ends to engage flanges 31 projecting on both sides of the outer beam 10 , as is apparent from fig1 and 11 . the slide bar supports attachments 17 and 20 for the arm hinges 16b and 21a , respectively . thus , the slide bar is movable in the longitudinal direction of the outer beam , 10 and is guided along the beam in that its ends are folded around the flanges 31 projecting sidewise from the beam . fig1 and 13 are lateral and end views , respectively , of the delimbing head 13 carrying gripping claws 32 which are arranged at the same time to delimit a tree - trunk upon displacement of the delimbing head . the delimbing head 13 has a circular recess 33 located substantially centrally , and , in parallel with this recess 33 , a smaller hole 34 extends receiving a locking pin 35 . at one of its ends , this locking pin projects over the edge of the delimbing head 13 to project into the locking plate 27 when the delimbing head is in the position shown in fig3 and 4 . in the hole 34 , the locking pin 35 is spring biased to enter this position when not actuated by other forces , the locking pin projecting out of the delimbing head . at its other end , the locking pin is bent with substantially two right angles and projects with an end surface 36 into the recess 33 . this end surface 36 and its bending are made to be able to displace the locking pin 35 out of engagement with the locking plate 27 and into the delimbing head upon insertion of an actuating means into the recess . fig1 and 16 are a lateral view and an end view , respectively , of the felling head 14 . the felling head 14 , also , supports gripping claws 37 and a cutter which , however , is not shown in the drawings . the felling head 14 has attaching arms 38 which have through holes 39 at their ends , in which pins can be attached to connect the attaching arms 38 and , consequently , the felling head 14 with the mounting clamp 29 , in that the pin passes through the holes 30 in the mounting clamp . the felling head has a substantially circular projection 40 projecting in parallel with the attaching arms and somewhat beneath these . the projection 40 is arranged to project into the recess 33 in the delimbing head 13 when the beams have been moved to the position shown in fig1 and 2 . when the projection is introduced into the recess 33 in the delimbing head , the projection 40 will press the end surface 36 further into the recess and move , in this way the locking pin 35 out of engagement with the locking plate 27 . by this movement , the delimbing head 13 is then connected to the felling head 14 and can be turned around the tilt shaft 25 when the felling head is actuated by the hydraulic cylinder 24 . although not shown in fig1 and 16 , the felling head 14 is also provided with an attachment for attaching the piston rod of the hydraulic cylinder 24 , as is apparent from fig1 and 2 . the elements described herein as attachments are shown including respective ear - like flanges mounted on the respective parts , and having openings for respective pins for pivotally securing the respective other elements to the elements on which the ear - like flanges are mounted . the elements described herein as arm hinges are , perhaps , more accurately thought of as being hinge arms . by the arrangements according to the invention , a relatively simple and easily - operable unit consisting of a delimbing head and a felling head has been achieved , which can be easily opened to the position shown in fig2 for felling standing wood . felling is then carried out by means of the cutter mentioned above , but not shown in the drawing , which can be of a type usual with wood processors and , for example , a hydraulically - operated chain saw . when a tree is to be felled , the wood processor is driven up to the tree with the arm system in the position shown in fig1 with the end provided with the delimbing head 13 and felling head 14 close to the tree to be felled . the hydraulic cylinder 24 is thereafter activated to lower the felling head 14 and the delimbing head 13 to the position shown in fig2 after which the gripping claws of these two units grab the tree - trunk in a conventional manner and the cutter saws off the tree . after this , the tree is felled , in that the hydraulic cylinder 24 retracts its piston rod and folds - up the felling head 14 back to the position shown in fig1 . when the felling head thereafter has returned to the position shown in fig1 the gripping claws 32 of the delimbing head will loosen their grip somewhat and the tree - trunk is held fast merely by the gripping claws 37 on the felling head 14 . the hydraulic cylinder 19 is thereafter activated and actuates the double - armed hinge 16a , 16b , pushing out the inner beam 12 and , consequently , the delimbing head 13 away from the felling head . the delimbing head 13 , moving along the tree - trunk , and the gripping claws 32 , running loosely against the tree - trunk , will then delimb the tree - trunk , and in dependence on the desired length of the trunk , the other hydraulic cylinder 23 can also be activated when the inner beam 12 has been pushed out , in order to also push out the intermediate beam 11 to the position shown in fig4 by the displacement of the slide bar 18 . when the intended length of the tree - trunk has been reached , corresponding to the distance between the delimbing head 13 and the felling head 14 , the gripping claws 32 of the delimbing head 13 will again grab firmly around the tree - trunk , while the gripping claws 37 of the felling head 14 will loosen their grip somewhat , after which the hydraulic cylinders 19 and 23 , respectively , are again activated to draw - in the beams 11 and 12 to the position shown in fig1 . when this has been attained , the saw in the felling head 14 is activated to cut - off the tree - trunk and a new delimbing process can next be carried out . fig1 shows a illustrative example of an arm system for a wood processor according to the invention . in this design , the arm system is composed of merely two arms , an outer beam 50 which at one of its ends is intended to be attached to a wood tractor and receives displaceably in itself an inner beam 51 which receives a delimbing head 13 at its outer end . the outer beam 50 carries a felling head 14 . the delimbing head 13 and the felling head 14 are of the same design as described in connection with the first illustrative example , however with the single essential difference that the felling head 14 in connection with the second illustrative example is attached to a traveling carriage 52 which is movable along the outer beam 50 . the traveling carriage 52 can preferably run by means of rollers 53 on the upper side of the outer beam . as in the first illustrative example , the felling head 14 can be opened to a substantially vertical position by means of a hydraulic cylinder 24 attached to the traveling carriage 52 . in order that the inner beam 51 might be pushed out of the outer beam 50 for extension of the arm system , an hydraulic cylinder 54 is arranged within the outer beam 50 and attached to each beam 50 , 51 by one attaching point . at both ends of the outer beam 50 , chain wheels 55 , 56 are arranged for control of chains 57 , 58 , which are attached at their one ends to the inner beam 51 and at their other ends to the traveling carriage 52 in such a way that the carriage moves on the outer beam 50 in a opposite direction relative to the inner beam 51 . by this embodiment of the arm system , a very simple and easy construction is obtained which can be carried even by small tractors .
a wood processor for felling , delimbing and cutting tree - trunks includes a system of arms containing at least two beams mutually movable in the longitudinal direction , one in the other . the wood processor also includes a unit composed of a delimbing head and a felling head attached to one end of the arm system . at its other end , the arm system is attached to a vehicle , for example a wood tractor , and is arranged substantially horizontally . the whole unit is pivotable about a turning point at one end of the arm system . the delimbing head is attached to the inner beam of the beams in the arm system and the felling head is attached to the outer beam of the beams in the arm system , so that the delimbing head is movably arranged in the longitudinal direction of the beams in relation to the felling head .