A truss structure is suitable for supporting lighting fixtures or other loads both in use and in transport. The truss has at least four elongated chords defining between said chords a first volume generally rectangular in cross-section. In transport, the truss is supported substantially above a surf
A truss structure is suitable for supporting lighting fixtures or other loads both in use and in transport. The truss has at least four elongated chords defining between said chords a first volume generally rectangular in cross-section. In transport, the truss is supported substantially above a surface by castered carriages bearing upon that surface, the carriages connected to said truss and in a first position producing an additional volume between said first volume and said surface. The carriages are attached to the truss so as to permit their rotation between said first position and at least a second position suitable for use while remaining connected to said truss.
대표청구항▼
1. A truss section, said truss section being elongated and having two ends, each of said ends suitable for mechanically coupling said truss section with another one of said truss sections, said truss section having an elongated central axis extending between said ends, a first elongated chord, said
1. A truss section, said truss section being elongated and having two ends, each of said ends suitable for mechanically coupling said truss section with another one of said truss sections, said truss section having an elongated central axis extending between said ends, a first elongated chord, said first chord extending between said ends, said first chord being substantially parallel to said central axis,a second elongated chord, said second chord extending between said ends, said second chord being substantially parallel to and spaced apart from said first chord,a third elongated chord, said third chord extending between said ends, said third chord being substantially parallel to and spaced apart from said first chord and said second chord,a fourth elongated chord, said fourth chord extending between said ends, said fourth chord being substantially parallel to and spaced apart from said first, said second, and said third chords,first cross-members mechanically connecting said first chord with said second chord,second cross-members mechanically connecting said second chord with said third chord,third cross-members mechanically connecting said third chord with said fourth chord,said four chords and said cross-members together defining a first volume, said first volume being substantially rectangular in cross-section and having, at least between said ends, one substantially unobstructed side,first and second leg carriages,said leg carriages each having at least a first and a second elongated leg,said first and said second elongated leg each having one and another end;said leg carriages also having an additional elongated structural member, said additional elongated member having first and second ends, and being attached at said first end to said first leg proximate to said one end of said first leg,said additional elongated member being attached at said second end to said second leg proximate to said one end of said second leg,each of said leg carriages having at least two casters, one of said casters being attached to each said leg, proximate to said one end of said leg,the improvement comprising said another ends of said first and said legs of said leg carriage being attached to said truss structure so as to permit rotation of said leg carriage between:a first position, in which said additional elongated members of said first and second leg carriages are parallel to each other and to said chords, and said legs of said first and said second leg carriages are parallel to each other, said additional elongated members and said first and said fourth chords of said truss defining a second volume, said second volume adjacent said substantially unobstructed side of said first volume, generally rectangular in cross-section, and at least equal in area to said first volume,and at least a second position in which said additional elongated members of said carriages have been rotated to positions closer to said second and said third chords than to said first and said fourth chords. 2. The improvement according to claim 1, wherein said first and said second leg carriages can be detached from said truss structure. 3. The improvement according to claim 1, wherein said legs of said first and said second leg carriages can be adjusted in length, such that said cross-section of said second volume can be altered. 4. The improvement according to claim 1, wherein said first and said second legs of said leg carriage can be fixed in each of a plurality of said second positions. 5. The improvement according to claim 1, wherein said first and said second legs of said leg carriage can be fixed in a said second position wherein said legs are substantially parallel to said first cross-members. 6. A truss section, said truss section being elongated and having two ends, each of said ends suitable for mechanically coupling said truss section with another one of said truss sections, said truss section having an elongated central axis extending between said ends, a first elongated chord, said first chord extending between said ends, said first chord being substantially parallel to said central axis,a second elongated chord, said second chord extending between said ends, said second chord being substantially parallel to and spaced apart from said first chord,a third elongated chord, said third chord extending between said ends, said third chord being substantially parallel to and spaced apart from said first chord and said second chord,a fourth elongated chord, said fourth chord extending between said ends, said fourth chord being substantially parallel to and spaced apart from said first, said second, and said third chords,first cross-members mechanically connecting said first chord with said second chord,second cross-members mechanically connecting said second chord with said third chord,third cross-members mechanically connecting said third chord with said fourth chord,said four chords and said cross-members together defining a first volume, said first volume being substantially rectangular in cross-section and having, at least between said ends, one substantially unobstructed side,first and second leg carriages,said leg carriages each having at least a first and a second elongated leg,said first and said second elongated leg each having one and another end;said leg carriages also having an additional elongated structural member, said additional elongated member having first and second ends, and being attached at said first end to said first leg proximate to said one end of said first leg,said additional elongated member being attached at said second end to said second leg proximate to said one end of said second leg,each of said leg carriages having at least two casters, one of said casters being attached to each said leg, proximate to said one end of said leg,said truss section having receptacles suitable for receiving said another end of said first and said second leg,the improvement comprising a hinge disposed in each of said first and said second legs between said first and said second ends of said leg. 7. The improvement according to claim 6, wherein said first and said second leg carriages can be detached from said truss structure. 8. The improvement according to claim 6, wherein said legs of said first and said second leg carriages can be adjusted in length, such that said cross-section of said second volume can be altered. 9. The improvement according to claim 6, wherein said leg carriage can be fixed in each of a plurality of positions relative to said truss.
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이 특허에 인용된 특허 (21)
Swiderski Paul R. (Georgetown KY) Seadler Paul J. (Jefferson KY), Articulated ladder assembly.
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