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US 4,187,733 AGranted
Speed reduction mechanism for semi-trailer landing gear
AssigneeDayton-Walther Corporation
InventorsWilliam D. Walther, Charles E. Phillips
Life of this patent
Estimating the term…
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AssigneeDayton-Walther Corporation
InventorsWilliam D. Walther, Charles E. Phillips
Estimating the term…
A semi-trailer landing gear speed reduction mechanism is provided which includes two horizontally disposed parallel spaced shafts with one shaft being rotated by a manual crank means and the other shaft connected to a mechanism for raising and lowering the landing gear. A two speed ratio for the mechanism is provided by having a fixed pair of gears secured to the driven shaft, a pinion gear fixed to the driving shaft and a gear having both internal and external threads supported on its internal threads on the driving shaft and in engagement with a pinion gear on the driven shaft. The drive shaft is axially shiftable between a first position in which the last said gear is free to rotate about the driving shaft and the pinion gear secured to the driving shaft is in driving engagement with a gear on the driven shaft, and a position in which the pinion gear on the driving shaft is in engagement with the internal threads on the floating gear which in turn drivingly engages with its external threads the pinion gear secured to the driven shaft.
In a geared speed reduction crank mechanism for a semi-trailer landing gear, the improvement comprising:
A two-speed gear mechanism for a semi-trailer landing gear, comprising a housing, a drive shaft rotatably mounted in said housing, a driven shaft rotatably mounted in said housing in laterally offset relation to said drive shaft, a spur gear member mounted on said drive shaft and having a toothed portion and an axially adjacent cylindrical portion, a driven output gear mounted on said output shaft and having a first gear portion thereon of a diameter proportioned to engage said spur gear and having a second gear portion of a smaller diameter adjacent to said first portion, and an internally-externally toothed gear positioned in annular relation to said drive shaft and having its external teeth in constant running engagement with said second gear portion and having its internal teeth proportioned to mate in a spline like fashion with the teeth of said spur gear, and said spur gear and drive shaft being movable axially between two selected positions, a first of said positions providing for engagement of said spur gear with said first gear portion while said internal teeth ride on said cylindrical portion and a second said position providing splined engagement with said internal teeth so that said spur gear and said internally-externally toothed gear rotates in unison to drive said output shaft through the external teeth thereof and said second gear portion of said output gear.
Dependencies are inferred from the claim text.