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An apparatus for supporting a trailer of a tractor semitrailer has a supporting element that is telescopically adjustable by way of a gear shifting mechanism having a gear input shaft running vertically onto a spindle. In this way, the supporting element has an especially compact construction and c

An apparatus for supporting a trailer of a tractor semitrailer has a supporting element that is telescopically adjustable by way of a gear shifting mechanism having a gear input shaft running vertically onto a spindle. In this way, the supporting element has an especially compact construction and can be installed very easily. The gear shift also has a free floating gear between two shift positions and can be shifted very conveniently.

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The invention claimed is: 1. In an apparatus for supporting a trailer of a tractor-semitrailer with a telescopically height-adjustable supporting element having an outer sleeve and an inner sleeve, with a spindle mounted in the supporting element and driven by a multi step gear shifting mechanism v

The invention claimed is: 1. In an apparatus for supporting a trailer of a tractor-semitrailer with a telescopically height-adjustable supporting element having an outer sleeve and an inner sleeve, with a spindle mounted in the supporting element and driven by a multi step gear shifting mechanism via a bevel gear arrangement and with a spindle nut engaging one of the sleeves and collaborating with the spindle, said gear shifting mechanism displaying a gear input shaft having both a small-diameter sprocket wheel and a large-diameter sprocket wheel, a rotatably mounted set of sprocket wheels collaborating with the sprocket wheels of the gear input shaft and bevel gear arrangement as well as shiftable coupling means designed for the optional connection of the gear input shaft to the sprocket wheels of the sprocket wheel set via one of the sprocket wheels, wherein the improvement comprises an arrangement of the gear input shaft running perpendicularly and in one a common plane onto with the spindle. 2. The apparatus as in claim 1, wherein the spindle and the gear input shaft have a common bearing block. 3. The apparatus as in claim 2 wherein the spindle nut displays a cup-shaped inner space which is open at the top; and wherein a portion of the bearing block is disposed in the inner space when the spindle nut is adjacent the bearing block. 4. The apparatus as in claim 3, wherein the inner space of the spindle nut is bounded by three laterally outwardly projecting collar segments located at the same height and wherein the spindle nut displays a lower-lying laterally outwardly projecting collar segment disposed directly below the large-diameter sprocket wheel; and wherein the lower-lying collar segment is disposed adjacent the large-diameter sprocket wheel when the spindle nut is adjacent the bearing block. 5. The apparatus as in claim 4, wherein the spindle nut displays an upwardly extending intermediate wall above the lower-lying collar segment; and wherein when the spindle nut is adjacent the bearing block the large-diameter sprocket wheel is disposed laterally adjacent the intermediate wall and the input shaft extends over the intermediate wall into the inner space. 6. The apparatus as in claim 2, wherein the bevel gear arrangement includes a first bevel gear mounted on and rotatable with the spindle; and wherein the bearing block displays a depression on its top side in which a portion of the first bevel gear is disposed. 7. The apparatus as in claim 2, wherein the bearing block defines a bearing boring for the gear input shaft and a through-going boring in which the spindle is received; and wherein the bearing boring communicates with the through-going boring. 8. The apparatus as claim 2, wherein the bearing block is connected to the outer sleeve on three sides, the fourth side being arranged inwardly some distance away from the outer sleeve; and wherein a portion of one of the sprocket wheels is disposed between the fourth side and the outer sleeve. 9. The apparatus as in claim 2 wherein the gear input shaft has at least one groove to receive radially-inward pre-tensioned locking elements arranged in cartridges of the bearing block. 10. The apparatus as in claim 1, wherein the sprocket wheel set is manufactured as one piece a gear output shaft. 11. The apparatus as in claim 10, wherein the gear input shaft and the gear output shaft are mounted in a covering which closes an opening of the outer sleeve. 12. The apparatus as in claim 11, wherein the covering is designed as single piece. 13. The apparatus of claim 11 wherein the gear input shaft has at least one groove to receive radially-inward pre-tensioned locking elements arranged in cartridges of the covering. 14. The apparatus as in claim 11, wherein the covering is manufactured from a sintered material. 15. The apparatus of claim 1 further including a small-diameter sprocket wheel of the sprocket wheel set, the small diameter sprocket wheel being designed as an interlocking connection of the gear output shaft with an inner denticulation of one of the remaining sprocket wheels. 16. The apparatus as in claim 1, wherein the large-diameter sprocket wheel of the sprocket wheel set has an inner denticulation and is seated on a correspondingly designed denticulation of one of the sprocket wheels. 17. The apparatus of claim 16 wherein the small-diameter sprocket wheel of the gear input shaft is designed as a means for coupling the gear input shaft with the large-diameter sprocket wheel displaying the inner denticulation. 18. The apparatus of claim 16 wherein the large-daimeter sprocket wheel of the gear input shaft has a cup-shaped region for receivably holding the small-diameter sprocket wheel in a central position. 19. The apparatus as in claim 1, wherein the spindle is arranged outside of the center of the supporting element. 20. The apparatus of claim 1 wherein the improvement further comprises a collecting pan for lubricant positioned below the large-diameter sprocket wheel. 21. A leg for a semitrailer landing gear, the leg comprising: an outer sleeve and an inner sleeve, the inner sleeve being telescopically received in the outer sleeve; an input shaft which is rotatable about a longitudinal axis; a rotatable spindle disposed within the inner and outer sleeves; a gear assembly connected to the input shaft; the gear assembly capable of rotating the spindle to raise and lower the inner sleeve with respect to the outer sleeve in response to rotation of the input shaft; a bearing block connected to the outer sleeve; the bearing block having a bearing bore; a portion of the input shaft being received in the bearing bore; and a spindle nut having a top and operatively connecting the gear assembly to the inner sleeve for the raising and lowering of the inner sleeve via collaboration of the spindle and spindle nut; the top of the nut being disposed above the longitudinal axis of the input shaft when the nut engages or is adjacent the bearing block. 22. A leg for a semitrailer landing gear, the leg comprising: an outer sleeve and an inner sleeve; the inner sleeve being telescopically received in the outer sleeve; an input shaft having a longitudinal axis; an output shaft which is offset from the input shaft and rotatable about an output shaft axis; a gear assembly connected to the input shaft; the gear assembly capable of raising and lowering the inner sleeve with respect to the outer sleeve in response to rotation of the input shaft; the gear assembly having a spindle that has a longitudinal axis; the spindle threadedly engaging a spindle nut that moves the inner sleeve up and down in response to rotation of the spindle; the input shaft and spindle being disposed in a common reference plane; a bearing block connected to the outer sleeve; the input shaft being supported by the bearing block. 23. The leg of claim 22, further comprising a cover connected to the outer sleeve; the leg being free of gears disposed between the cover and the outer sleeve. 24. A leg for a semitrailer landing gear, the leg comprising: an outer sleeve; an inner sleeve telescopically received in the outer sleeve; a rotatable spindle which is disposed within the inner and outer sleeves; an input shaft which is rotatable about an input shaft axis and has an inner end which is disposed within the outer sleeve; an output shaft which is offset from the input shaft and rotatable about an output shaft axis; and a gear assembly for rotating the spindle to raise and lower the inner sleeve with respect to the outer sleeve in response to rotation of the input shaft. 25. The leg of claim 24 wherein the gear assembly includes a plurality of sprocket wheels including a first sprocket wheel; further including a spindle nut which is non-rotatably mounted on the inner sleeve and which collaborates with the spindle for raising and lowering the inner sleeve and spindle nut with respect to the outer sleeve between raised and lowered positions in response to rotation of the spindle; and wherein the spindle nut defines an upwardly opening recess in which a portion of the first sprocket wheel is received when the spindle nut is in the raised position. 26. The leg of claim 24 wherein the gear assembly includes a first sprocket wheel having an outer perimeter; and further including a lubricant collecting pan which is disposed below the first sprocket wheel and through which the outer perimeter of the sprocket wheel passes during rotation of the first sprocket wheel. 27. The leg of claim 24 wherein the gear assembly includes a first sprocket wheel; and further including a bearing block defining a bearing bore in which the input shaft is received; wherein the bearing block is disposed within and connected to the outer sleeve; and wherein the bearing block has a first side which faces laterally outwardly and is spaced inwardly from the outer sleeve so that the first side and the outer sleeve define therebetween a space in which a portion of the first sprocket wheel is disposed. 28. The leg of claim 24 wherein the outer sleeve has a sidewall defining an opening; wherein the gear assembly includes a first bevel gear, a second bevel gear operatively engaging the first bevel gear, and a first sprocket wheel a portion of which is disposed in the opening in the outer sleeve sidewall; and wherein the first sprocket wheel has an outer denticulation which is disposed entirely within the outer sleeve sidewall. 29. The leg of claim 24 wherein the gear assembly includes a first bevel gear which is mounted on the spindle and rotatable therewith; a second bevel gear which operatively engages the first bevel gear; and a plurality of sprocket wheels; and wherein at least one of the sprocket wheels is disposed entirely within the outer sleeve. 30. The leg of claim 24 wherein the outer sleeve has a sidewall defining an input shaft entrance opening; wherein the spindle has an upper end; wherein the input shaft is disposed below the upper end of the spindle and extends through the input shaft entrance opening so that the inner end of the spindle faces the spindle; further including a spindle nut which is non-rotatably mounted on the inner sleeve and which collaborates with the spindle for raising and lowering the inner sleeve and spindle nut with respect to the outer sleeve in response to rotation of the spindle; and wherein the spindle is positioned off center within the inner and outer sleeves in a direction away from the input shaft entrance opening so that the off center spindle and the outer sleeve sidewall adjacent the input shaft entrance opening define therebetween a laterally extending enlarged space for accommodating therein a portion of the input shaft adjacent the inner end thereof. 31. The leg of claim 30 wherein the gear assembly includes a first bevel gear; a second bevel gear operatively engaging the first bevel gear; and a first sprocket wheel a portion of which is disposed within the enlarged space. 32. The leg of claim 24 further including a bearing block defining a bearing bore for receiving a portion of the input shaft therein; and a spindle nut non-rotatably mounted on the inner sleeve and collaborating with the spindle for raising and lowering the inner sleeve with respect to the outer sleeve in response to rotation of the spindle; wherein the gear assembly includes a sprocket wheel rotatable about the input shaft axis; wherein the spindle nut includes an upwardly extending sidewall which defines an upwardly opening recess which receives therein a portion of the bearing block when the spindle nut is disposed adjacent the bearing block; wherein the spindle nut includes a collar which projects laterally outwardly from the sidewall; wherein the collar includes a first collar segment which is disposed at a first height and a second collar segment which is disposed at a second height lower than the first height; wherein the first and second collar segments are connected to the inner sleeve; wherein a portion of the sprocket wheel is disposed directly above the second collar segment of the spindle nut; and wherein the portion of the sprocket wheel is disposed laterally adjacent the sidewall of the spindle nut when the upwardly opening recess of the spindle nut receives therein the portion of the bearing block.