| 摘要 |
PCT No. PCT/EP87/00251 Sec. 371 Date Mar. 7, 1988 Sec. 102(e) Date Mar. 7, 1988 PCT Filed May 14, 1987 PCT Pub. No. WO87/06910 PCT Pub. Date Nov. 19, 1987.In the use of a tractor to maneuver an airplane on its nose landing gear, which tractor includes a chassis (10); having a rear access (32) which receives said nose wheels and having two telescoping bars (38) the length of which can be adjusted by means of first hydraulic cylinders (40) and to the rear ends of which (38.2.1) pivotable pulling arms (54) are hingedly connected for engagement behind the nose wheels; and having a support surface (30.3) for the raising of the nose landing gear, which is performed by means of second hydraulic cylinders (44), in order to cause less wear on the nose wheels during loading and raising and to prevent damage to the tractor and/or nose landing gear in the attempt to pull said nose landing gear into the recess by means of the pulling arms, it is suggested: (a) to form the chassis in two parts and to hingedly connect its front portion (10.1) with its rear portion (10.2) at a folding axis (36) and by means of the second aggregates (44) above this axis; (b) to arrange the immovable portions (38.1) of the telescoping bars and the cylinders (40.1) of the first aggregates (40) on the front portion of the chassis; (c) to form the support surface on an elevating shovel (30) at the level of the folding axis, which elevating shovel extends from the front portion of the chassis behind this axis into the downwardly open chassis recess behind the shovel and between the rear wheels (22); and (d) to provide a holder (46) axially opposite the laterally positioned pulling arms and above the elevating shovel, which holder can be moved approximately parallel to the longitudinal axis (18) at the same time as the pulling arms by means of third hydraulic cylinders (48).
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