| Prairie Machine & Parts Mfg. (1978) Ltd. Patent applications |
| Patent application number | Title | Published |
|---|
| 20110192702 | CONVEYOR MACHINE HAVING PIVOT CONNECTOR COMPRISING CURVED TRACK AND ROLLERS ENGAGING TRACK - A mobile conveyor machine is provided for a cascading conveyor system in the form of a series of mobile conveyor machines pivotably connected together in the form of a conveyor train. The conveyor machine comprises an elongate supporting frame arranged substantially horizontally and having longitudinal side frame members and first and second ends. The supporting frame extends along a central longitudinal axis of the conveyor machine. A conveyor belt system is mounted on the supporting frame and arranged to convey materials from the first end to the second end. A pair of transversely aligned propelling devices are each separately connected to the supporting frame for pivotable movement about a generally vertical pivot axis. This pair is located near but spaced from the first end and has a common axis of rotation when the propelling devices are positioned to move the conveyor machine in a straightforward direction. The machine also comprises a power mechanism for steering the pair of propelling devices. A pivot mechanism for pivotably connecting the mobile conveyor machine at the first end to an end section of another mobile conveyor machine comprises a curved track bent in a horizontal circular arc having a center of curvature located midway between the propelling devices on the axis of rotation and rigidly mounted on the supporting frame. The pivot mechanism further comprises a hitch unit mounted for rolling movement on the track and connected to the track. This hitch unit has roller means engaging the track and is adapted for detachable connection to the another mobile conveyor machine. | 08-11-2011 |
| 20100038213 | Conveyor machine having pivot connector comprising curved track and rollers engaging track - A hitch apparatus is provided for use on a first mobile machine such as a conveyor vehicle to be used with a second mobile machine connected to the first machine. The apparatus includes a track member adapted for mounting at an end of the first machine, this member providing a track having two opposite sides and bent to form a circular arc having a center of curvature. A hitch unit is mounted for rolling movement on the track and can pivotably connect the end of the first machine to the second machine. The hitch unit includes rollers for engaging both of the opposite sides so that the track is captured between the rollers. The first machine is able to pivot about a substantially vertical axis extending through the center of curvature relative to the second machine and is connected to the second machine for movement therewith. | 02-18-2010 |
| 20090288933 | Belt type conveyor apparatus with adjustable tail pulley - A conveyor apparatus for use with a conveyor belt includes an elongate conveyor support frame and a plurality of conveyor support devices mounted on this frame. These devices include a tail pulley mechanism having two tail pulley sections mounted on a pulley support for rotation about a common central axis of rotation. The pulley support includes a central support portion located at inner ends of the pulley sections and extending radially outwardly from these inner ends to a vertically extending pivot axis. An interconnecting support arrangement mounts the pulley support on the conveyor support frame and includes a pivot connector connecting the central support portion for pivotable movement about the pivot axis. An actuator can pivot the pulley support about the pivot axis to maintain the conveyor belt within a central region of the tail pulley. | 11-26-2009 |
