Variable hood apparatus

Abstract

Proposed is a variable hood apparatus. The variable hood apparatus includes a support holder fixed to a wall, a rotation holder configured to be rotatable around a vertical axis of rotation while being supported by the support holder, an arm portion supported by the rotation holder and configured to be capable of performing a three-dimensional movement, a foldable hood mounted on an end portion of the arm portion, the foldable hood being configured to be unfolded while being used and to be folded while being not used, an exhaust pipe which is connected to the foldable hood and which extends to an outside, and an exhaust mechanism configured to generate an airflow which is formed inside the exhaust pipe and which is in a direction toward the outside, thereby inducing a negative pressure in the foldable hood.

What is claimed is: 
     
         1 . A variable hood apparatus comprising:
 a support holder fixed to a wall;   a rotation holder configured to be rotatable around a vertical axis of rotation while being supported by the support holder;   an arm portion supported by the rotation holder and configured to be capable of performing a three-dimensional movement;   a foldable hood mounted on an end portion of the arm portion, the foldable hood being configured to be unfolded while being used and to be folded while being not used;   an exhaust pipe which is connected to the foldable hood and which extends to an outside; and   an exhaust mechanism configured to generate an airflow which is formed inside the exhaust pipe and which is in a direction toward the outside, thereby inducing a negative pressure in the foldable hood.   
     
     
         2 . The variable hood apparatus of  claim 1 , wherein the support holder is provided with a vertical hole which extends in a vertical direction and which has a predetermined inner diameter,
 wherein the rotation holder comprises:   a fitting shaft fitted into the vertical hole such that the fitting shaft is axially rotatable; and   a support bracket connected to the fitting shaft via a connector, the support bracket being formed in a semicircular disk shape, and the support bracket having a first through-hole and a plurality of second through-holes disposed at equal angle intervals around the first through-hole,   wherein the arm portion comprises:   a first arm supported by the support bracket such that the first arm is rotatable up and down, the first arm having an extension end portion thereof provided with an arm connecting pin;   a second arm linked to the arm connecting pin of the first arm and configured to be rotatable; and   a third arm which is connected to an end portion of the second arm via a joint portion and which extends in a longitudinal direction, the third arm having an extension end portion thereof coupled to the foldable hood,   wherein an end portion of the first arm is formed with a support pin hole corresponding to the first through-hole, and is formed with an angle pin hole corresponding to the plurality of second through-holes,   wherein the support pin hole enables a support pin to pass therethrough while the support pin hole and the first through-hole are aligned, and the angle pin hole enables an angle maintaining pin to pass therethrough while the angle pin hole and selected second through-hole are aligned.   
     
     
         3 . The variable hood apparatus of  claim 1 , wherein the exhaust pipe is a flexible bellows, an extension end portion of the exhaust pipe is provided with a fixing block that is capable of being fitted into and fixed to a window frame, and the exhaust mechanism comprises a blower and an air guiding pipe which is connected to the blower and inserted into an inside of the exhaust pipe, the air guiding pipe being configured to eject air supplied from the blower to the inside of the exhaust pipe. 
     
     
         4 . The variable hood apparatus of  claim 3 , wherein a venturi portion is further provided inside the exhaust pipe, and the air guiding pipe is disposed on a downstream of the venturi portion. 
     
     
         5 . The variable hood apparatus of  claim 2 , wherein the foldable hood comprises:
 a head portion linked to an end portion of the third arm and connected to the exhaust pipe; and   a wing portion connected to a lower portion of the head portion, the wing portion being configured to guide gas to be exhausted to the head portion by being unfolded while being used, and the wing portion being folded while being not used.   
     
     
         6 . The variable hood apparatus of  claim 5 , wherein the wing portion comprises a plurality of split wings hinge-connected to the head portion and configured to be rotatable up and down, the plurality of split wings being configured such that opposite end portions in a side direction thereof are in close contact with each other while being rotated upward, thereby maintaining an unfolded state. 
     
     
         7 . The variable hood apparatus of  claim 5 , wherein the wing portion comprises:
 a plurality of fixing ribs which is fixed to the head portion and which extends in a radial direction around the head portion, and which is spaced apart from each other by predetermined intervals;   a plurality of rotation ribs respectively pin connected to the plurality of fixing ribs and configured to be rotatable up and down;   a plurality of rib fixing mechanisms configured to enable the plurality of rotation ribs to maintain an unfolded state when the plurality of rotation ribs is rotated upward; and   a heat-resistant light permeable fabric fixed to the plurality of fixing ribs and the plurality of rotation ribs, the heat-resistant light permeable fabric being configured to be unfolded while the plurality of rotation ribs is rotated upward, thereby guiding the gas to be exhausted to the head portion.   
     
     
         8 . The variable hood apparatus of  claim 7 , wherein the plurality of rib fixing mechanisms comprises:
 a plurality of arcuate-shaped rods having a predetermined curvature and respectively fixed to the plurality of rotation ribs;   a plurality of ratchet fingers respectively mounted on the plurality of arcuate-shaped rods, the plurality of ratchet fingers being configured to be rotatable; and   a plurality of locking tubes supported by the head portion and providing a plurality of passages through which the plurality of arcuate-shaped rods respectively passes, the plurality of locking tubes being configured such that inner portions of the passages are respectively provided with a plurality of toothed portions, and the plurality of toothed portions being configured to be locked on the plurality of ratchet fingers, respectively, such that the plurality of rotation ribs is prevented from being moved downward.