Inventors:
James Liggett - Martin MI, US
Tim Powers - Caledonia MI, US
Troy Garland - Hamilton MI, US
International Classification:
E01B 25/22
Abstract:
A track having a stopping means that can stop a puck member from descending an undesired distance. After stopping of the puck member, the user can relocate the puck member within a channel for continued downward movement within the channel.