Patent ID: 8439100

Claim:
A modular vertical upright for a service door ( 1 ), said service door having a horizontal box section ( 4 ) provided with lateral flanges ( 19 ) configured to retain a driving drum ( 7 ) and to guide a rotation of the drum ( 7 ) during movement of a flexible curtain ( 6 ) between an open position and a closed position, comprising: an upper plate ( 18 ) to be fastened to the lateral flange ( 19 ) of the horizontal box section ( 4 ), a lower plate ( 20 ) to be fixed to the ground, a central core ( 21 ) comprising at least one tubular vertical structural section ( 22 ), the central core connecting the upper plate ( 18 ) and the lower plate ( 20 ) together, an envelope ( 24 ) extending over a full height of the central core ( 21 ), comprising a cloth ( 23 ) fixed around the upper plate ( 18 ), the lower plate ( 20 ), and an entirety of the central core ( 21 ) between the upper plate ( 18 ) and the lower plate ( 20 ), and a guiding device ( 15 ) constituting a slide for movement of the flexible curtain ( 6 ), wherein each of the central core, the cloth, and the guiding device ( 21 , 23 , 15 ) is formed of an elastically deformable material in order to make the service door ( 1 ) highly resistant to impact, and wherein the at least one tubular vertical structural section ( 22 ) of the central core ( 21 ) is formed of one of the group consisting of: composite material of high elasticity, plastic material of high elasticity, and steel having a high elastic limit.