Spring balance assembly

Spring balancer for a roll-up door

Spring closing device for doors or other similar structures

Spring coupler for block and tackle window balance system

Spring cover friction system for sash balance

Spring failure detection system and method

Spring hinge

Spring hinge

Spring hinge

Spring hinge

Spring hinge

Spring hinge

Spring hinge

Spring hinge

Spring hinge and method of manufacturing

Spring hinge for counterbalancing lids

Spring hinge for doors

Spring hinge for swing doors

Spring hinge with a damper

Spring loaded door closer