Patent ID: 7762304

Claim:
A device for detecting an obstacle and limiting the force of a primary edge or closure sill bar ( 10 ) of a flexible apron or curtain ( 5 ) of a goods-handling door ( 1 ) upon the event of the goods-handling door ( 1 ) encountering the obstacle ( 14 ) while the goods-handling door ( 1 ) is closing, said goods-handling door ( 1 ) including means of driving said flexible curtain or apron ( 5 ), and two vertical uprights ( 2 , 3 ) arranged to oppose each other, each of said vertical uprights connected to a guiding device ( 8 ) with two opposing slides ( 11 , 12 ), and each guiding device ( 8 ) constituting a guide ( 15 ) on and over an entire height of each respective upright, the device comprising: elements ( 13 ) attached to the flexible curtain or apron ( 5 ); and safety cells ( 21 , 22 ) positioned and fixed in a proximity of each guiding device ( 8 ) and configured to emit at least one beam (F) outside of the guide ( 15 ) and in a vertical direction, wherein said elements ( 13 ) are flexible and configured to deform in order to interrupt the beam (F) emitted by the safety cells ( 21 , 22 ) when said flexible apron or curtain encounters the obstacle ( 14 ) during the descent, and wherein the safety cells are configured such that, when said curtain or apron ( 5 ) encounters the obstacle during the closing, said at least one beam (F) is interrupted by a deformation of the flexible curtain or apron ( 5 ), or is interrupted by a deformation of said elements ( 13 ) attached to the flexible curtain ( 5 ).