|8177193||Grain bin lifting system and method|
A building and grain bin lifting system utilizing a combination of lifting assemblies for lifting building and grain bin components. The lifting assembly includes a mobile supporting structure, a jack disposed within the mobile supporting structure configured to lin...
|7900890||Worm-rack type transmission device|
In a worm-rack type transmission device (1), a curved side portion (6) is provided on rack teeth (2a) of a linear rack (2) in a manner to form a part of an ellipsoidal surface (E) and twisted by a changing rate (θ) of a torsional ...
|4848735||Gear box for rack and pinion jack and method of making same|
A tongue mounted rack and pinion jack for a trailer wherein a pair of die-cast gear box segments are bolted together for supporting a handle driven worm gear and a pinion gear in self-contained bearing surfaces formed in the gear box segments. When the ge...