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A prefabricated building structure having a collapsible roof and adapted to be transported by a road carrier vehicle is described. The prefabricated building structure is provided with at least opposed parallel load bearing side walls. A roof section having a plurality of spaced roof rafters is pivo

A prefabricated building structure having a collapsible roof and adapted to be transported by a road carrier vehicle is described. The prefabricated building structure is provided with at least opposed parallel load bearing side walls. A roof section having a plurality of spaced roof rafters is pivotally connected by one or more pivot connections to a respective one of a top plate of each of the load bearing side walls. The roof sections are interconnectable to one another when the roof sections are disposed angularly upwards to form a raised pitch roof structure. A leverage beam is connectable to one of the rafters of each roof section and is securable to a cable which is secured to a pulley whereby to permit the roof sections to be raised or lowered.

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We claim: 1. A prefabricated building structure comprising a floor structure and vertical side walls secured to said floor structure along an outside perimeter thereof, at least two of said side walls being opposed parallel load bearing side walls, each said opposed parallel load bearing side walls

We claim: 1. A prefabricated building structure comprising a floor structure and vertical side walls secured to said floor structure along an outside perimeter thereof, at least two of said side walls being opposed parallel load bearing side walls, each said opposed parallel load bearing side walls having a horizontal top plate extending therealong, two roof sections having a plurality of spaced rafters held together in spaced-apart relationship and pivotally connected by pivot connections to said top plate of a respective one of said opposed parallel load bearing side walls, said roof sections being interconnectable to one another by connecting means when said roof sections are disposed angularly upwards to form a raised pitch roof structure, leverage beam slidingly retained in close sliding fit within at least a lower portion of one of said rafters which is at least partly a hollow structural rafter located in a predetermined region of each said roof sections, said leverage beam having a lower leverage section extending out of said lower portion of said hollow structural rafter with a force transmitting section maintained in said hollow structural rafter, and a force exerting means connectable to a free end portion of said lower leverage section of said leverage beam to cause said roof sections to be raised or lowered on their said pivot connections to form said raised pitch roof structure or a collapsed roof structure for transport of said prefabricated building structure. 2. A prefabricated building structure as claimed in claim 1 wherein a cable is connectable at one end to said free end portion of said lower leverage section of said leverage beam and at another end to said force exerting means to apply a pulling force on said cable to raise each said roof sections on said pivot connections or to apply a releasing force to lower said roof sections on said one or more pivot connections. 3. A prefabricated building structure as claimed in claim 2 wherein said force exerting means is a winch having a drum about which a portion of said cable is wound. 4. A prefabricated building structure as claimed in claim 1 wherein said hollow structural rafter is a metal rafter, said leverage beam being a reinforced metal beam. 5. A prefabricated building structure as claimed in claim 4 wherein said leverage beam is slidingly retained captive in said hollow structural rafter and entirely storable therein. 6. A prefabricated building structure as claimed in claim 4 wherein said leverage beam is removably connectable in said lower portion of said hollow structural rafter. 7. A prefabricated building structure as claimed in claim 4 wherein said predetermined region is located substantially centrally in each said roof section. 8. A prefabricated building structure as claimed in claim 1 wherein said connecting means is a ridge plate secured to a top end of said rafters of each said roof section and maintaining said rafters in said spaced-apart relationship, and connecting means to secure said ridge plate of each said roof section together when said roof sections are raised and positioned to form said pitch roof structure. 9. A prefabricated building structure as claimed in claim 8 wherein said ridge plate is a rigid metal plate, each metal plate having connecting formations for matingly engaging with one another to connect said two rigid metal plates together to secure said top ends of said rafters of said two roof sections to form a roof peak. 10. A prefabricated building structure as claimed in claim 9 wherein an elongated metal roof cap is secured over said roof peak by internal connecting attachments which are connectable to some of said rafters of each said roof sections under said roof cap. 11. A prefabricated building structure as claimed in claim 1 wherein said one or more pivot connections are each comprised of a slide arm secured to a pivot support and extending along a side face portion of an associated one of said roof rafters, said pivot support being secured to said top plate, said slide arm having a horizontal slot for the passage of one or more bolts disposed across said rafter and threadably secured to a clamping means disposed against said slide arm outwardly thereof, said clamping means arresting said slide arm at a desired location along said rafter by tightening said bolts to thereby adjust the longitudinal position of said rafter of said roof sections with respect to an associated one of said opposed load bearing sidewalls. 12. A prefabricated building structure as claimed in claim 11 wherein one of said pivot connections is secured substantially at mid-length of said top plate, and wherein a ceiling joist is secured transversely between a selected one of reinforced studs of said opposed parallel load bearing side walls closest to said pivot connection on said top plate structure of said opposed parallel load bearing side walls. 13. A prefabricated building structure as claimed in claim 12 wherein one of said pivot connections is an adjustable pivot connection secured to said top plate for attachment to a side face of a rafter adjacent opposed ends of each of said opposed load bearing sidewalls, each said adjustable pivot connection being comprised of a side arm secured to a pivot support and extending along a side face of said rafter, said side arm having a horizontal slot for the passage of one or more bolts disposed across said rafter, a lock element secured to said bolts to arrest said side arm against said rafter at a desired position and constituting said clamping means, said pivot support having an adjustable linkage to provide displacement of said roof sections inwardly of said opposed load bearing sidewalls for the transportation of said building structure by a road transport carrier with said roof sections in their collapsed position. 14. A prefabricated building structure as claimed in claim 1 wherein there is further provided rafter support means secured to a top face of said top plate members to support said rafters of said roof sections which are not provided with said pivot connections in aligned relationship with said rafters having said pivot connections. 15. A prefabricated building structure as claimed in claim 12 wherein said reinforced studs closest to said pivot connection at substantially mid-length of said top plate is a metal post stud, said metal post stud being provided at opposed ends thereof with attaching brackets for immovable securement at a top end to said top plate, and at a bottom end to a foot plate of said load bearing side walls, said attaching bracket at said top end having pivot support flanges extending above said top plate for receiving a pivot pin of said pivot connection at mid-length of said top plate. 16. A prefabricated building structure as claimed in claim 6 wherein said leverage beam is a removably connectable leverage beam comprised of two spaced apart beam sections interconnected in spaced parallel relationship and forming a longitudinal gap therebetween, said leverage beam having an outer end provided with an attaching means for connection of said cable thereto, said beam having an inner end provided with a connecting formation for removable retention thereof in said lower end section of said hollow structural rafter, and a central beam section dimensioned for close fit in said longitudinal gap and connectable therein after said inner end of said beam has been inserted in said lower end section of said hollow structural rafter, said central beam section being disconnected form said longitudinal gap and removed therefrom for removal of said leverage beam from said hollow structural rafter. 17. A prefabricated building structure as claimed in claim 3 wherein said winch is secured to a winch support bracket secured between floor joists of said floor structure in substantially vertical alignment with said leverage beam and behind a floor header of said floor structure, and a cable guide pulley rotatably mounted on said winch support bracket for guiding said cable free a lower edge of said floor header. 18. A prefabricated building structure as claimed in claim 3 wherein a lateral load distribution cable is interconnected between said winch support brackets secured on opposed sides of said floor structure in transverse alignment with one another. 19. A prefabricated building structure as claimed in claim 1 wherein said prefabricated building structure is a small residential building structure dimensioned for transport as a unitary structure with said roof sections in said collapsed position by a transport road carrier vehicle with said roof sections retained collapsed.