Duct unit for air-conditioner

Details Duct unit for air-conditioner Duct unit for air-conditioner

2005-10-25

2005-10-25

Brinson, Patrick (Department: 3754)

Pipes and tubular conduits

Longitudinally seamed

Sectional

C138S119000, C138SDIG010, C138S158000, C138S155000

Reexamination Certificate

active

06957670

ABSTRACT:
An object of the present invention is to provide an air-conditioning duct unit capable of being made compact when transported to largely reduce the cost of transport inside and outside a building as well as the cost of transportation by a truck.A duct unit A of the present invention has upper and lower wall portions1and3and right and left wall portions2and4formed of metal sheets, and spin locks curved into a curled shape, the spin locks being provided on the wall portions1to4at two side edges of the same along the longitudinal direction. One of the pair of spin locks provided on each adjacent pair of the wall portions is inserted in the other to form one of lock joints9-1to9-4rotatably. The wall portions1to4are linked so that the duct unit A can be changed in shape. Consequently, the duct unit can be folded so as to be flattened.

REFERENCES:
patent: 789315 (1905-05-01), Bergsttrom
patent: 3818948 (1974-06-01), Hedges
patent: 3861423 (1975-01-01), Hedges
patent: 59038542 (1984-03-01), None
patent: 2002193365 (2002-07-01), None
patent: 2003114044 (2003-04-01), None
patent: 2005098626 (2005-04-01), None

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