Exhaust hood with a vapor-collecting canopy

Abstract

An exhaust hood is provided that includes a chimney housing and a first vapor-collecting canopy pivotally secured to the chimney housing. The first vapor-collecting canopy is automatically movable between two end positions by a driving mechanism. The driving mechanism is in the form of a crank mechanism and includes a first crank disk and an electric motor for rotating the first crank disk. The first crank disk is torque-transmittingly connected by a push rod to the first vapor-collecting canopy.

1 . An exhaust hood, comprising:
 a chimney housing;   a first vapor-collecting canopy pivotally secured to the chimney housing; and   a driving mechanism, the drive mechanism configured to automatically move the first vapor-collecting canopy between two end positions,   wherein the driving mechanism includes a crank mechanism including a first crank disk and an electric motor configured to rotate the first crank disk, the first crank disk torque-transmittingly connected by a first push rod to the first vapor-collecting canopy.   
   
   
       2 . The exhaust hood recited in  claim 1 , wherein the first crank disk has two actuating cams configured to actuate a limit switch, the limit switch integrated in an electric circuit of the electric motor. 
   
   
       3 . The exhaust hood recited in  claim 2 , wherein the limit switch is operatable by an electrical controller of the exhaust hood. 
   
   
       4 . The exhaust hood recited in  claim 1 , wherein the driving mechanism includes a second crank disk extending parallel to the first crank disk, the second crank disk torque-transmittingly connected to the first crank disk via a shaft and connected by a second push rod to the first vapor-collecting canopy, the first and second push rods secured to the first vapor-collecting canopy so as to be substantially maximally spaced apart. 
   
   
       5 . The exhaust hood recited in  claim 1 , wherein the first vapor-collecting canopy includes a first side skirt, the first side skirt engaging a guide groove on the chimney housing. 
   
   
       6 . The exhaust hood recited in  claim 5 , wherein the guide groove is formed in a separate guide member, the guide member detachably secured to the chimney housing. 
   
   
       7 . The exhaust hood recited in  claim 5 , wherein the guide groove includes a base and two side walls, longitudinal profiles of the base and free edges of the side walls substantially following a circular path about an axis of rotation of the pivoting attachment of the first vapor-collecting canopy to the chimney housing. 
   
   
       8 . The exhaust hood recited in  claim 5 , wherein a second vapor-collecting canopy is pivotally secured to the chimney housing opposite the first vapor-collecting canopy, the second vapor-collecting canopy automatically movable between two respective end positions by the driving mechanism, the driving mechanism including a third crank disk which extends parallel to the first crank disk and torque-transmittingly connected to the first crank disk and force-transmittingly connected by a third push rod to the second vapor-collecting canopy. 
   
   
       9 . The exhaust hood recited in  claim 8 , wherein the second vapor-collecting canopy includes a second side skirt overlapping the first side skirt of the first vapor-collecting canopy in one end position of the two vapor-collecting canopies, the first and second side skirts engaging in a first guide groove and a second guide groove, respectively, of a common guide member mounted to the chimney housing, the first and second guide groves spaced-apart. 
   
   
       10 . The exhaust hood recited in  claim 1 , wherein the first vapor-collecting canopy includes an angularly bent portion and the chimney housing includes an edge, the angularly bent portion and the edge pivotally securing the first vapor-collecting canopy to the chimney housing. 
   
   
       11 . The exhaust hood recited in  claim 2 , wherein the driving mechanism includes a second crank disk extending parallel to the first crank disk, the second crank disk torque-transmittingly connected to the first crank disk via a shaft and connected by a second push rod to the first vapor-collecting canopy, the first and second push rods secured to the first vapor-collecting canopy so as to be substantially maximally spaced apart. 
   
   
       12 . The exhaust hood recited in  claim 3 , wherein the driving mechanism includes a second crank disk extending parallel to the first crank disk, the second crank disk torque-transmittingly connected to the first crank disk via a shaft and connected by a second push rod to the first vapor-collecting canopy, the first and second push rods secured to the first vapor-collecting canopy so as to be substantially maximally spaced apart. 
   
   
       13 . The exhaust hood recited in  claim 2 , wherein the first vapor-collecting canopy includes a first side skirt, the first side skirt engaging a guide groove on the chimney housing. 
   
   
       14 . The exhaust hood recited in  claim 3 , wherein the first vapor-collecting canopy includes a first side skirt, the first side skirt engaging a guide groove on the chimney housing. 
   
   
       15 . The exhaust hood recited in  claim 4 , wherein the first vapor-collecting canopy includes a first side skirt, the first side skirt engaging a guide groove on the chimney housing. 
   
   
       16 . The exhaust hood recited in  claim 6 , wherein the guide groove includes a base and two side walls, longitudinal profiles of the base and free edges of the side walls substantially following a circular path about an axis of rotation of the pivoting attachment of the first vapor-collecting canopy to the chimney housing. 
   
   
       17 . The exhaust hood recited in  claim 2 , wherein a second vapor-collecting canopy is pivotally secured to the chimney housing opposite the first vapor-collecting canopy, the second vapor-collecting canopy automatically movable between two respective end positions by the driving mechanism, the driving mechanism including a third crank disk which extends parallel to the first crank disk and torque-transmittingly connected to the first crank disk and force-transmittingly connected by a third push rod to the second vapor-collecting canopy. 
   
   
       18 . The exhaust hood recited in  claim 3 , wherein a second vapor-collecting canopy is pivotally secured to the chimney housing opposite the first vapor-collecting canopy, the second vapor-collecting canopy automatically movable between two respective end positions by the driving mechanism, the driving mechanism including a third crank disk which extends parallel to the first crank disk and torque-transmittingly connected to the first crank disk and force-transmittingly connected by a third push rod to the second vapor-collecting canopy.