Patent GB-622169-A (GB)
Title: Improvements in or relating to tractor-loaders and the like
IPC: A01D87/08
Filed: 1947-03-05
Abstract: 622,169. Load handling trucks. INTERNATIONAL HARVESTER CO. OF GREAT BRITAIN, Ltd. (International Harvester Co.). March 5, 1947, No. 6268. [Class 78 (iii)] A load-handling frame, pivotally attached to a tractor and provided with an excavating shovel or other load-handling member projecting forwardly of the tractor, has power actuated means including ground engaging elements for effecting initial lifting of the frame by direct purchase on the ground so that the tractor is relieved of the initial heavy strain' as when breaking away the load in excavating. In the embodiment shown the lifting frame comprises a pair of quadrilateral linkages disposed on either side of the tractor, each linkage consisting of a frame arm 17 or 18, Figs. 2 and 5, pivoted on a member 134 which is detachably secured to the rear axle 15 of the tractor, an arm 56 which is rigidly attached to the member 134 and is braced by a member 69, an arm 72 which is constructed from two spaced parallel plates 73, 74 pivotally mounted on the arm 17 or 18 and a rod 76 pivoted at one end on the rigid arm 56 and at the other between the plates 73, 74. Pivoted between each pair of these plates is a curved lever 81 which, when in the position shown in Fig. 2, is prevented from further downward movement by an adjustable abutment 90, said lever being pivoted at its lower end to a leg 84 braced by an arm 91, which leg carries a ground engaging foot 85 at its lower end, the arrangement being such that when piston rods 80 are extended from a pair of cylinders 66 the levers 81, to which said rods are pivotally attached, are extended downwards and the frame arms 17 and 18 are lifted by the linkages which each bear on a ground engaging foot 85 until the levers 81 engage abutments 90, after which the feet are lifted with the frame. The two sets of linkages are spaced by members 62 and 126 and prevented from twisting relative to one another by a torsion resistant tube 77. A further coupling is provided by rods 96 revolubly mounted at one end on the tube 77 and slidably mounted at the other in sleeves 97 pivotally mounted at either end of a member 98 attached to the front of the tractor. The shovel 16 has a series of tines 21, Figs. 4 and 9, secured by shear bolts 137 to an angle 136 which is fastened between the lower limbs of a U-shaped member 23 between which member and a further U-shaped member 26, pivoted at the ends of arms 17, 18, is a curved shield 24. The two U-shaped members are connected by arms 30, 31 the rear ends of which are bifurcated and carry rollers 35 which, when the shovel is in a load supporting position, are engaged by lugs 42, 43 on pivoted spring loaded arms 38, 39 having attached thereto shovel unbalancing members 44, 45 which contact the rollers 35 and positively tilt the shovel when the lugs 42, 43 are disengaged from the rollers 35 by the lever 54, rods 53 and chain 51. Chains 63 attached to members 62 and 23 prevent excessive tipping of the shovel. In a further embodiment (not shown) the initial and final lifting movements may be effected by separate power actuated means and the leg members 84 may be replaced by hydraulic jacks.