Fume hood with improved counterbalance system

Details Fume hood with improved counterbalance system Fume hood with improved counterbalance system

B - Operations, Transporting

08

B

B08B 15/02 (2006.01)

Patent

CA 2182107

A fume hood includes a housing with a work chamber, an access opening to the work chamber, and a sash that one may move between raised and lowered positions to open or close the access opening. It also includes a counterbalance system that maintains the sash at a desired position between two predetermined limits. An adjusting weight system reduces the weight provided by the counterbalance system or increases the weight of the sash to allow the sash to drop to a predetermined position after it has moved above that predetermined position.

Hotte d'extraction de fumées comprenant un boîtier avec chambre de travail, une ouverture donnant accès à la chambre de travail, et un châssis pouvant être levé ou abaissé afin d'ouvrir ou de fermer l'accès. La hotte comporte également un système de contrepoids qui maintient le châssis à la position voulue entre deux limites prédéterminées. Un système de réglage de masse permet de réduire l'effet du contrepoids ou d'augmenter le poids du châssis pour que ce dernier redescende vers une position prédéterminée après qu'il ait été levé au dessus de cette position prédéterminée.

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