Powered pushing unit

• Main Author: Gunter, James
• Format: Patent
• Language: English
• Published: 01.11.2001

A powered pushing unit transfers loads no greater than a predetermined magnitude in one direction along the length of a load transfer system. The pushing unit includes a frame and a source of power for moving the pushing unit back and forth along the length of the load transfer system. A dog for engaging a load is pivotally mounted with respect to the frame. A restricting mechanism applies a load engaging force to hold the dog at a load transfer range of positions until the load is greater than the predetermined magnitude. A toggle joint is mounted between the dog and the frame. The togglejoint forms an angle in a first angular direction to lock the dog in a load engaging position during engagement of a load under the predetermined magnitude. The toggle joint further shifts to form an angle in a second angular direction upon engagement of a load in excess of the predetermined magnitude, thereby allowing the dog to pivot away from the load which is in excess of the predetermined magnitude. When pivoting away from and passing beneath the load, the dog exerts a force against the load that is substantially less than the predetermined magnitude. A toggle force mechanism returns the toggle joint to a first angular direction after the dog passes the load.