Floor springs operate using what we call a CAM action mechanism. When the door is opened, regardless of in which direction, the bottom arm, which is fixed to the door, rotates the CAM spindle. This, in turn, rotates the CAM itself. The CAM is connected to the piston and, when it’s rotated, pulls the piston head.Click to see full answer. Similarly, you may ask, what is a floor spring?A Floor Spring is a mechanical door closing device mostly used for glass doors along with patch fitting. Floor springs are mostly used where both pull and push movement is required.Also, what is floor hinge? Definition of floor hinge. : a usually double-acting hinge placed between the bottom of a door and the floor. Keeping this in view, who invented the door spring? Francis Richards What is Patch fitting?Patch Fittings. Patch fittings are a frameless glass concept, which evolved as modern interior and exterior design option for commercial and residential projects. In patch fittings concept silicon sealants are used in between the segment toughened glasses to act as a cushion between the glass panels.