Track wheel bearing system for sliding doors, has sliding block axially movable between lowered blocking position and raised free position within channel

摘要

A sliding block, wider than the end opening of a channel, is axially movable between a lowered blocking position and a raised free position within the channel. At the blocking position, the block positions partly into the end opening and stops the flat upper part of a track wheel with respect to the channel interior. The end opening is narrower than the channel interior.