Patent GB-1283057-A (GB)
Title: Tree harvesting machine
IPC: A01G23/00
Filed: 1970-04-17
Abstract: 1283057 Tree felling MASSEY-FERGUSON Inc 17 April 1970 [21 April 1969] 18606/70 Heading A1E [Also in Division E2] A tree harvesting machine is characterised in having means for grasping a tree and means for encircling a cable around the tree to attach the tree to a winch 18 on the machine to enable the tree to be moved after felling. Mounted on the vehicle 10 is a boom support 26 driven by an hydraulic motor 27 which supports booms 28 and 34 whose pivotal movement is controlled respectively by hydraulic cylinders 36 and 42. Pivoted to boom 34 about 50 is a pivot head 48 controlled by hydraulic cylinder 52 and mounted on the pivot head 48 about a longitudinal pivot 59 is a shear head 58 which is pivotable by the hydraulic cylinder 72. At the lower end of the shear head 58 is a housing 60 in which a pair of cutters 68 are mounted about pivot 70 to be operated by hydraulic cylinders 62 and fences 190 and 191 on the cutters 68 and pivot 70 respectively are provided to confine the foot of the cut tree. At the upper end of the shear head are provided hydraulically operable clamp arms 82 which pivot about pivots 84 to grasp the tree. Choker details. To the winch 18 is connected one end of a cable 16 which terminates in a nub 118 and slidably mounts a plurality of fasteners 122. Between a support plate 96 (Fig. 2) on the shear head 58 and the plate 94 which supports the clamp arms 82 are pivoted choker arms 98 and 100 which are operated by hydraulic cylinders 102 and 108 respectively. Each one of a plurality of choker cables is attached at one end to a fastener 122 and slidably passes through a socket member 126 stored in a magazine 138, attached to the housing 60, to terminate in a stud 124 which is stored in a magazine 114 attached to the outer end of the choker arm 100. Socket members 126 stored in the magazine 138 are resiliently urged upwards where the uppermost members abuts a pair of arms 142 pivotal about 144 to retain the members. The magazine 114 comprises a housing 124 in which is mounted an upwardly biased clip 130 in which the studs 124 are retained in slots 128. Pivotally mounted on the outer end of the choker arm 98 is a pick-up device 116 comprising an upper plate 152 and a hook 154 which, when the arm 98 is pivoted, lies in the path of the uppermost socket member 126 in the magazine 138. Operation. Before shearing the tree, clamp arms 82 engage the tree and choker arms 98 and 100 are pivoted when the pick-up device 116 on arm 98 picks up a socket member 126 with its choke cable 120 to bring it into engagement with the stud 124 retained in the magazine 114 on arm 100. The stud 124 (Fig. 7) has a generally spherical head which on closing of the choker arms is urged into an elongated aperture 170 in the socket member 126 where it passes into a cavity where it is retained by a flange 176 (not shown). After felling the tree the machine may be driven to a further tree with the cable 16 paying out freely from winch 18 where, after felling, the further tree is attached to the winch by a further choker cable 120 until a sufficient load is obtained