Patent ID: 6101782
Filing Date: 2000-08-15
Classification: E04D

Abstract:
An apparatus for providing a roof structure having a plurality of purlins spaced apart from one another in a parallel arrangement, the apparatus comprising:a plurality of carriage sections movable along the length of the purlins, said carriage sections being joined together to form a carriage;a plurality of puller assemblies attached to selective ones of the plurality of carriage sections, said puller assemblies engageable to move said carriage along the purlins; anda controller electrically connected to a source of power and said puller assemblies, said controller operable to a master control mode, wherein said plurality of puller assemblies are simultaneously engaged to move said carriage sections in unison, and said controller is operable to a selective mode, wherein at least one but not all of said puller assemblies is selectively engaged to modify the alignment of the plurality of carriage sections.