Adjustable duct assembly for fume and dust removal
OwnerMaury Simms, Robin Boudreault +1inventors
InventorsMaury Simms, Robin Boudreault, Marco Finauri
Life of this patent
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Abstract
An adjustable duct assembly for the collection of fumes, dust and the like comprises two duct sections pivotally connected end to end and to a base by an external duct support system. The duct sections are retained in a selected position without the need for any friction fittings by a combination of a counterbalance arm extending from the duct support of a lower or outer duct section beyond the pivot point of the elongate arms, to counterbalance the lower or outer arms, and a retraction or tension-applying arm which holds the inner duct section in position.
Claims14
An adjustable duct assembly comprising:
- a base for mounting on a ceiling or other fixed substrate;
- first and second elongate duct sections in end to end communicating relation, said first section being pivotally joined with said base at a shoulder joint and said first and second sections being pivotally joined together at an elbow joint;
- a hinged framework external to said duct sections joined with said base and duct sections to permit folding of the duct sections;
- a counterweight joined to said second duct section for counterbalancing movement of said second section caused by gravity acting on said second section;
- retraction means connecting said base and said first section to counteract the force of gravity acting on said assembly, said retraction means comprising a spring means for exerting an expansionary force and force reversal means for reversing the expansionary force of said spring means, said force reversal means comprising first and second links joined to opposed end regions of said springs means and extending around said spring means for converting the expansionary force thereof into a retractive force, said first and second links pivotally mounted to said base and said first duct section respectively.
An adjustable duct assembly comprising:
- a base for mounting on a ceiling or other fixed substrate;
- first and second elongate duct sections in end to end communicating relation, said first section being pivotally joined with said base at a shoulder joint and said first and second sections being pivotally joined together at an elbow joint, for folding movement of said duct sections;
- a framework external to said duct sections joined with said base and duct sections, said framework being hinged to permit folding of the duct sections;
- a counterweight joined to said second duct section for counterbalancing the force of gravity acting on said second duct section;
- retraction means connecting said base and said first section to counteract the force of gravity acting on said assembly, said retraction means comprising a spring means for exerting an expansionary force and force reversal means for reversing the expansionary force of said spring means, said force reversal means comprising first and second links joined to opposing end regions of said spring means and extending around said spring means for converting the expansionary force thereof into a retractive force, said first and second links pivotally mounted to said base and said first duct section respectively;
- first and second mount means, said first mount means comprising first and second arm pivotally mounted together at an apex, said first arm being pivotally joined to base and said second arm being pivotally connected to said first duct section, and said first link being mounted to said first mount;
- said second mount comprising an arm pivotally joining said second link with said first duct section.
Dependencies are inferred from the claim text.