Speed control for revolving door

Speed control system for a linear induction motor

Speed release mechanism for cylinder and plug assembly for...

Spindle assembly for use in a door handle assembly

Spindle door operator

Spindle for a door handle assembly

Spindle lock

Spring actuated hinge

Spring balance adjustment

Spring balance assembly

Spring balance assembly

Spring balance assembly

Spring balance assembly

Spring balancer for a roll-up door

Spring biased roller for a shower door or the like

Spring break device

Spring closing device for doors or other similar structures

Spring counterweight system for door double-hung window

Spring coupler for block and tackle window balance system

Spring cover friction system for sash balance