Patent ID: 11970906
Assignee: 7912854 CANADA INC.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 7:
8. A roller blind mechanism for a roller blind system comprising a roller blind tube with a blind mounted thereto, the blind being extendable and retractable between upper and lower end positions, the roller blind mechanism comprising:
the roller blind limiter assembly according to claim 1;
a torsion spring extending along the longitudinal direction of the roller blind limiter assembly and having a fixed end portion engaged with the support-engaging member and a rotatable end portion angularly couplable with the roller blind tube; and
a spring stiffness adjuster at least partially surrounded by the torsion spring, comprising a thread conforming to coils of the torsion spring to be displaceable along the torsion spring upon rotation of the spring stiffness adjuster about the longitudinal direction, and defining an active portion of the torsion spring upon loading of the torsion spring.