Sealable ceiling assembly

A cross beam assembly for a sealable ceiling assembly, the cross beam assembly comprising:

• a cross beam comprising a first end;
• and
• a coupling member slidably coupled to the first end, the coupling member comprising an engagement feature disposable to interlock with a main beam, and a tightening feature disposed to urge retraction of the coupling member with respect to the first end of the cross beam to tighten the first end against the main beam in response to actuation of the tightening feature;
• and
• a resilient member associated with the first coupling member disposed to urge withdrawal of the coupling member from the first end with a force small enough to be overcome by actuation of the tightening feature.

A coupling member for attaching a cross beam to a main beam to construct a sealable ceiling assembly, the coupling member comprising:

• a head comprising a cam surface shaped to permit rotation of the head within a receiving feature of the main beam, between a disengaged orientation in which the head can be translated out of the receiving feature and an engaged orientation in which the head cannot be translated out of the receiving feature;
• a set screw movable to press against the cross beam to draw the cross beam toward the main beam when the head is engaged by the receiving feature;
• and
• a resilient member associated with the first coupling member disposed to urge withdrawal of the coupling member from the cross beam with a force small enough to be overcome by actuation of the set screw.

A sealable ceiling assembly comprising:

• a main beam comprising a first side having a receiving feature with an insertion portion;
• a cross beam comprising a first end;
• and
• a first coupling member attachable to the first end, wherein the first coupling member comprises an engagement feature shaped to be translated into the receiving feature via the insertion portion and subsequently moved away from the insertion portion to interlock with the receiving feature to restrict withdrawal of the first end from the first side;
• and
• a resilient member associated with the first coupling member disposed to urge withdrawal of the first coupling member from the first end.