END STOP APPARATUS AND METHODS.

摘要

An adjustable end stop (201) may selectively include one or more of the following elements: at least one guide member (231), a collapsible member (213), a movable assembly (211), a drive mechanism (241), and a position adjustment mechanism (771). The guide member may have the collapsible member and/or movable assembly attached thereto. The collapsible member may be configured to collapse when the end of the tubular member engages the collapsible member in a first direction and resist collapsing when the end of the tubular member engages the collapsible member in a second direction. The movable assembly may be movably attached to the at least one guide member, in which the movable assembly is configured to move along at least a portion of the length of the at least one guide rail. Further, the drive mechanism may be used to selectively position the collapsible member and/or movable assembly along the at least one guide member.