Swivelling movie screen suspender and method
A framework for temporarily suspending a movie screen from a ceiling track includes an oblong beam adjustably mounted to the track. A locking pivot mechanism secured to a middle part of the beam supports a pair of oppositely extending cantelevered booms. Each boom can have inwardly extending substantially parallel rails similar to a ceiling track. Each of the booms can carry variously sized locking cradles which can support a spar for a movie screen or other structures. A second locking pivot mechanism having a rotation axis mutually orthogonal to the first pivot mechanism can provide the booms with additional adjustability.
1. The combination of a ceiling track and an adjustable framework:
wherein said adjustable framework comprises:
a beam including a first end and a second end;
a first hanger located proximate said first end for suspending said beam from said track;
a second hanger located proximate said second end for suspending said beam from said track;
wherein at least one of said first and second hangers is adjustable along a vertical direction;
a pivot secured to a medial part of said beam, said pivot comprises:
a housing;
a spindle rotatively mounted to said housing, and having a first axis of rotation substantially parallel to said vertical direction;
a clamp releasably locking the angular position of said spindle in said housing;
a first boom extending canteleveredly from said housing;
a second boom extending canteleveredly from said housing;
a first locking cradle secured to said first boom; and,
a second locking cradle secured to said second boom.
2. The combination of claim 1 , wherein said first and second booms are elongated along coaxial axes.
3. The combination of claim 1 , wherein each of said cradles comprises a hook for engaging an oblong member perpendicular to said axis of rotation.
4. The combination of claim 3 , wherein each of said cradles further comprise a cradle lock for releasably securing said member within said hook.
5. The combination of claim 1 , wherein said clamp comprises:
said spindle intimately and rotatively engaging a bearing in said housing;
said bearing having a substantially cylindrical sidewall;
a pair of arcuate chock jaws engaged by a jackscrew;
said chock jaws contacting said spindle through an aperture in a said substantially cylindrical sidewall; and,
whereby rotation of said jackscrew causes relative movement of said jaws.
6. The combination of claim 1 , wherein said beam comprises at least one level secured proximate to one of said ends.
7. The combination of claim 1 , wherein at least one of said booms comprises a pair of inwardly extending substantially parallel rails separated by a slot having a given slot width.
8. The combination of claim 1 , wherein said pivot is a first pivot, and wherein said combination further comprises a second pivot interposed between said first pivot and said booms so that a second axis of rotation of said second pivot is mutually substantially orthogonal to said first axis of rotation.